Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * fs/cifs/file.c |
| 3 | * |
| 4 | * vfs operations that deal with files |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 5 | * |
| 6 | * Copyright (C) International Business Machines Corp., 2002,2007 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 8 | * Jeremy Allison (jra@samba.org) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * |
| 10 | * This library is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU Lesser General Public License as published |
| 12 | * by the Free Software Foundation; either version 2.1 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This library is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 18 | * the GNU Lesser General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU Lesser General Public License |
| 21 | * along with this library; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 23 | */ |
| 24 | #include <linux/fs.h> |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 25 | #include <linux/backing-dev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/stat.h> |
| 27 | #include <linux/fcntl.h> |
| 28 | #include <linux/pagemap.h> |
| 29 | #include <linux/pagevec.h> |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 30 | #include <linux/writeback.h> |
Andrew Morton | 6f88cc2 | 2006-12-10 02:19:44 -0800 | [diff] [blame] | 31 | #include <linux/task_io_accounting_ops.h> |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 32 | #include <linux/delay.h> |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 33 | #include <linux/mount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <asm/div64.h> |
| 35 | #include "cifsfs.h" |
| 36 | #include "cifspdu.h" |
| 37 | #include "cifsglob.h" |
| 38 | #include "cifsproto.h" |
| 39 | #include "cifs_unicode.h" |
| 40 | #include "cifs_debug.h" |
| 41 | #include "cifs_fs_sb.h" |
| 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | static inline int cifs_convert_flags(unsigned int flags) |
| 44 | { |
| 45 | if ((flags & O_ACCMODE) == O_RDONLY) |
| 46 | return GENERIC_READ; |
| 47 | else if ((flags & O_ACCMODE) == O_WRONLY) |
| 48 | return GENERIC_WRITE; |
| 49 | else if ((flags & O_ACCMODE) == O_RDWR) { |
| 50 | /* GENERIC_ALL is too much permission to request |
| 51 | can cause unnecessary access denied on create */ |
| 52 | /* return GENERIC_ALL; */ |
| 53 | return (GENERIC_READ | GENERIC_WRITE); |
| 54 | } |
| 55 | |
Jeff Layton | e10f7b5 | 2008-05-14 10:21:33 -0700 | [diff] [blame] | 56 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
| 57 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | |
| 58 | FILE_READ_DATA); |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 59 | } |
Jeff Layton | e10f7b5 | 2008-05-14 10:21:33 -0700 | [diff] [blame] | 60 | |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 61 | static inline fmode_t cifs_posix_convert_flags(unsigned int flags) |
| 62 | { |
| 63 | fmode_t posix_flags = 0; |
Jeff Layton | e10f7b5 | 2008-05-14 10:21:33 -0700 | [diff] [blame] | 64 | |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 65 | if ((flags & O_ACCMODE) == O_RDONLY) |
| 66 | posix_flags = FMODE_READ; |
| 67 | else if ((flags & O_ACCMODE) == O_WRONLY) |
| 68 | posix_flags = FMODE_WRITE; |
| 69 | else if ((flags & O_ACCMODE) == O_RDWR) { |
| 70 | /* GENERIC_ALL is too much permission to request |
| 71 | can cause unnecessary access denied on create */ |
| 72 | /* return GENERIC_ALL; */ |
| 73 | posix_flags = FMODE_READ | FMODE_WRITE; |
| 74 | } |
| 75 | /* can not map O_CREAT or O_EXCL or O_TRUNC flags when |
| 76 | reopening a file. They had their effect on the original open */ |
| 77 | if (flags & O_APPEND) |
| 78 | posix_flags |= (fmode_t)O_APPEND; |
Christoph Hellwig | 6b2f3d1 | 2009-10-27 11:05:28 +0100 | [diff] [blame] | 79 | if (flags & O_DSYNC) |
| 80 | posix_flags |= (fmode_t)O_DSYNC; |
| 81 | if (flags & __O_SYNC) |
| 82 | posix_flags |= (fmode_t)__O_SYNC; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 83 | if (flags & O_DIRECTORY) |
| 84 | posix_flags |= (fmode_t)O_DIRECTORY; |
| 85 | if (flags & O_NOFOLLOW) |
| 86 | posix_flags |= (fmode_t)O_NOFOLLOW; |
| 87 | if (flags & O_DIRECT) |
| 88 | posix_flags |= (fmode_t)O_DIRECT; |
| 89 | |
| 90 | return posix_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | } |
| 92 | |
| 93 | static inline int cifs_get_disposition(unsigned int flags) |
| 94 | { |
| 95 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
| 96 | return FILE_CREATE; |
| 97 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) |
| 98 | return FILE_OVERWRITE_IF; |
| 99 | else if ((flags & O_CREAT) == O_CREAT) |
| 100 | return FILE_OPEN_IF; |
Steve French | 55aa2e0 | 2006-05-30 18:09:31 +0000 | [diff] [blame] | 101 | else if ((flags & O_TRUNC) == O_TRUNC) |
| 102 | return FILE_OVERWRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | else |
| 104 | return FILE_OPEN; |
| 105 | } |
| 106 | |
| 107 | /* all arguments to this function must be checked for validity in caller */ |
Jeff Layton | 590a3fe | 2009-09-12 11:54:28 -0400 | [diff] [blame] | 108 | static inline int |
| 109 | cifs_posix_open_inode_helper(struct inode *inode, struct file *file, |
| 110 | struct cifsInodeInfo *pCifsInode, |
| 111 | struct cifsFileInfo *pCifsFile, __u32 oplock, |
| 112 | u16 netfid) |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 113 | { |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 114 | |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 115 | write_lock(&GlobalSMBSeslock); |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 116 | |
| 117 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
| 118 | if (pCifsInode == NULL) { |
| 119 | write_unlock(&GlobalSMBSeslock); |
| 120 | return -EINVAL; |
| 121 | } |
| 122 | |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 123 | if (pCifsInode->clientCanCacheRead) { |
| 124 | /* we have the inode open somewhere else |
| 125 | no need to discard cache data */ |
| 126 | goto psx_client_can_cache; |
| 127 | } |
| 128 | |
| 129 | /* BB FIXME need to fix this check to move it earlier into posix_open |
| 130 | BB fIX following section BB FIXME */ |
| 131 | |
| 132 | /* if not oplocked, invalidate inode pages if mtime or file |
| 133 | size changed */ |
| 134 | /* temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); |
| 135 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && |
| 136 | (file->f_path.dentry->d_inode->i_size == |
| 137 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
| 138 | cFYI(1, ("inode unchanged on server")); |
| 139 | } else { |
| 140 | if (file->f_path.dentry->d_inode->i_mapping) { |
| 141 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); |
| 142 | if (rc != 0) |
| 143 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; |
| 144 | } |
| 145 | cFYI(1, ("invalidating remote inode since open detected it " |
| 146 | "changed")); |
| 147 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
| 148 | } */ |
| 149 | |
| 150 | psx_client_can_cache: |
| 151 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { |
| 152 | pCifsInode->clientCanCacheAll = true; |
| 153 | pCifsInode->clientCanCacheRead = true; |
| 154 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
| 155 | file->f_path.dentry->d_inode)); |
| 156 | } else if ((oplock & 0xF) == OPLOCK_READ) |
| 157 | pCifsInode->clientCanCacheRead = true; |
| 158 | |
| 159 | /* will have to change the unlock if we reenable the |
| 160 | filemap_fdatawrite (which does not seem necessary */ |
| 161 | write_unlock(&GlobalSMBSeslock); |
| 162 | return 0; |
| 163 | } |
| 164 | |
Steve French | 703a3b8 | 2009-05-21 22:21:53 +0000 | [diff] [blame] | 165 | static struct cifsFileInfo * |
| 166 | cifs_fill_filedata(struct file *file) |
| 167 | { |
| 168 | struct list_head *tmp; |
| 169 | struct cifsFileInfo *pCifsFile = NULL; |
| 170 | struct cifsInodeInfo *pCifsInode = NULL; |
| 171 | |
| 172 | /* search inode for this file and fill in file->private_data */ |
| 173 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
| 174 | read_lock(&GlobalSMBSeslock); |
| 175 | list_for_each(tmp, &pCifsInode->openFileList) { |
| 176 | pCifsFile = list_entry(tmp, struct cifsFileInfo, flist); |
| 177 | if ((pCifsFile->pfile == NULL) && |
| 178 | (pCifsFile->pid == current->tgid)) { |
| 179 | /* mode set in cifs_create */ |
| 180 | |
| 181 | /* needed for writepage */ |
| 182 | pCifsFile->pfile = file; |
| 183 | file->private_data = pCifsFile; |
| 184 | break; |
| 185 | } |
| 186 | } |
| 187 | read_unlock(&GlobalSMBSeslock); |
| 188 | |
| 189 | if (file->private_data != NULL) { |
| 190 | return pCifsFile; |
| 191 | } else if ((file->f_flags & O_CREAT) && (file->f_flags & O_EXCL)) |
| 192 | cERROR(1, ("could not find file instance for " |
| 193 | "new file %p", file)); |
| 194 | return NULL; |
| 195 | } |
| 196 | |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 197 | /* all arguments to this function must be checked for validity in caller */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | static inline int cifs_open_inode_helper(struct inode *inode, struct file *file, |
| 199 | struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile, |
| 200 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, |
| 201 | char *full_path, int xid) |
| 202 | { |
| 203 | struct timespec temp; |
| 204 | int rc; |
| 205 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | if (pCifsInode->clientCanCacheRead) { |
| 207 | /* we have the inode open somewhere else |
| 208 | no need to discard cache data */ |
| 209 | goto client_can_cache; |
| 210 | } |
| 211 | |
| 212 | /* BB need same check in cifs_create too? */ |
| 213 | /* if not oplocked, invalidate inode pages if mtime or file |
| 214 | size changed */ |
Jeff Layton | 07119a4 | 2009-05-27 09:37:33 -0400 | [diff] [blame] | 215 | temp = cifs_NTtimeToUnix(buf->LastWriteTime); |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 216 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && |
| 217 | (file->f_path.dentry->d_inode->i_size == |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
| 219 | cFYI(1, ("inode unchanged on server")); |
| 220 | } else { |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 221 | if (file->f_path.dentry->d_inode->i_mapping) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | /* BB no need to lock inode until after invalidate |
| 223 | since namei code should already have it locked? */ |
Jeff Layton | cea2180 | 2007-11-20 23:19:03 +0000 | [diff] [blame] | 224 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); |
| 225 | if (rc != 0) |
| 226 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | } |
| 228 | cFYI(1, ("invalidating remote inode since open detected it " |
| 229 | "changed")); |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 230 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | } |
| 232 | |
| 233 | client_can_cache: |
Steve French | c18c842 | 2007-07-18 23:21:09 +0000 | [diff] [blame] | 234 | if (pTcon->unix_ext) |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 235 | rc = cifs_get_inode_info_unix(&file->f_path.dentry->d_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | full_path, inode->i_sb, xid); |
| 237 | else |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 238 | rc = cifs_get_inode_info(&file->f_path.dentry->d_inode, |
Steve French | 8b1327f | 2008-03-14 22:37:16 +0000 | [diff] [blame] | 239 | full_path, buf, inode->i_sb, xid, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | |
| 241 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 242 | pCifsInode->clientCanCacheAll = true; |
| 243 | pCifsInode->clientCanCacheRead = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 245 | file->f_path.dentry->d_inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | } else if ((*oplock & 0xF) == OPLOCK_READ) |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 247 | pCifsInode->clientCanCacheRead = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | |
| 249 | return rc; |
| 250 | } |
| 251 | |
| 252 | int cifs_open(struct inode *inode, struct file *file) |
| 253 | { |
| 254 | int rc = -EACCES; |
Jeff Layton | 590a3fe | 2009-09-12 11:54:28 -0400 | [diff] [blame] | 255 | int xid; |
| 256 | __u32 oplock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | struct cifs_sb_info *cifs_sb; |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 258 | struct cifsTconInfo *tcon; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | struct cifsFileInfo *pCifsFile; |
| 260 | struct cifsInodeInfo *pCifsInode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | char *full_path = NULL; |
| 262 | int desiredAccess; |
| 263 | int disposition; |
| 264 | __u16 netfid; |
| 265 | FILE_ALL_INFO *buf = NULL; |
| 266 | |
| 267 | xid = GetXid(); |
| 268 | |
| 269 | cifs_sb = CIFS_SB(inode->i_sb); |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 270 | tcon = cifs_sb->tcon; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
Steve French | a6ce493 | 2009-04-09 01:14:32 +0000 | [diff] [blame] | 272 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
Steve French | 703a3b8 | 2009-05-21 22:21:53 +0000 | [diff] [blame] | 273 | pCifsFile = cifs_fill_filedata(file); |
| 274 | if (pCifsFile) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 275 | rc = 0; |
Steve French | a6ce493 | 2009-04-09 01:14:32 +0000 | [diff] [blame] | 276 | FreeXid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 277 | return rc; |
Steve French | 703a3b8 | 2009-05-21 22:21:53 +0000 | [diff] [blame] | 278 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 280 | full_path = build_path_from_dentry(file->f_path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | if (full_path == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 282 | rc = -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | FreeXid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 284 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | } |
| 286 | |
Steve French | 7521a3c | 2007-07-11 18:30:34 +0000 | [diff] [blame] | 287 | cFYI(1, ("inode = 0x%p file flags are 0x%x for %s", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | inode, file->f_flags, full_path)); |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 289 | |
| 290 | if (oplockEnabled) |
| 291 | oplock = REQ_OPLOCK; |
| 292 | else |
| 293 | oplock = 0; |
| 294 | |
Steve French | 64cc2c6 | 2009-03-04 19:54:08 +0000 | [diff] [blame] | 295 | if (!tcon->broken_posix_open && tcon->unix_ext && |
| 296 | (tcon->ses->capabilities & CAP_UNIX) && |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 297 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
| 298 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
| 299 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); |
| 300 | /* can not refresh inode info since size could be stale */ |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 301 | rc = cifs_posix_open(full_path, &inode, file->f_path.mnt, |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 302 | cifs_sb->mnt_file_mode /* ignored */, |
| 303 | oflags, &oplock, &netfid, xid); |
| 304 | if (rc == 0) { |
| 305 | cFYI(1, ("posix open succeeded")); |
| 306 | /* no need for special case handling of setting mode |
| 307 | on read only files needed here */ |
| 308 | |
Steve French | 703a3b8 | 2009-05-21 22:21:53 +0000 | [diff] [blame] | 309 | pCifsFile = cifs_fill_filedata(file); |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 310 | cifs_posix_open_inode_helper(inode, file, pCifsInode, |
| 311 | pCifsFile, oplock, netfid); |
| 312 | goto out; |
Steve French | 64cc2c6 | 2009-03-04 19:54:08 +0000 | [diff] [blame] | 313 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
| 314 | if (tcon->ses->serverNOS) |
| 315 | cERROR(1, ("server %s of type %s returned" |
| 316 | " unexpected error on SMB posix open" |
| 317 | ", disabling posix open support." |
| 318 | " Check if server update available.", |
| 319 | tcon->ses->serverName, |
| 320 | tcon->ses->serverNOS)); |
| 321 | tcon->broken_posix_open = true; |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 322 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
| 323 | (rc != -EOPNOTSUPP)) /* path not found or net err */ |
| 324 | goto out; |
Steve French | 64cc2c6 | 2009-03-04 19:54:08 +0000 | [diff] [blame] | 325 | /* else fallthrough to retry open the old way on network i/o |
| 326 | or DFS errors */ |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 327 | } |
| 328 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | desiredAccess = cifs_convert_flags(file->f_flags); |
| 330 | |
| 331 | /********************************************************************* |
| 332 | * open flag mapping table: |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 333 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | * POSIX Flag CIFS Disposition |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 335 | * ---------- ---------------- |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | * O_CREAT FILE_OPEN_IF |
| 337 | * O_CREAT | O_EXCL FILE_CREATE |
| 338 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF |
| 339 | * O_TRUNC FILE_OVERWRITE |
| 340 | * none of the above FILE_OPEN |
| 341 | * |
| 342 | * Note that there is not a direct match between disposition |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 343 | * FILE_SUPERSEDE (ie create whether or not file exists although |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | * O_CREAT | O_TRUNC is similar but truncates the existing |
| 345 | * file rather than creating a new file as FILE_SUPERSEDE does |
| 346 | * (which uses the attributes / metadata passed in on open call) |
| 347 | *? |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 348 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | *? and the read write flags match reasonably. O_LARGEFILE |
| 350 | *? is irrelevant because largefile support is always used |
| 351 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, |
| 352 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation |
| 353 | *********************************************************************/ |
| 354 | |
| 355 | disposition = cifs_get_disposition(file->f_flags); |
| 356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
| 358 | |
| 359 | /* Also refresh inode by passing in file_info buf returned by SMBOpen |
| 360 | and calling get_inode_info with returned buf (at least helps |
| 361 | non-Unix server case) */ |
| 362 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 363 | /* BB we can not do this if this is the second open of a file |
| 364 | and the first handle has writebehind data, we might be |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
| 366 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); |
| 367 | if (!buf) { |
| 368 | rc = -ENOMEM; |
| 369 | goto out; |
| 370 | } |
Steve French | 5bafd76 | 2006-06-07 00:18:43 +0000 | [diff] [blame] | 371 | |
| 372 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 373 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, |
Steve French | 5bafd76 | 2006-06-07 00:18:43 +0000 | [diff] [blame] | 374 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
Steve French | 737b758 | 2005-04-28 22:41:06 -0700 | [diff] [blame] | 375 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
| 376 | & CIFS_MOUNT_MAP_SPECIAL_CHR); |
Steve French | 5bafd76 | 2006-06-07 00:18:43 +0000 | [diff] [blame] | 377 | else |
| 378 | rc = -EIO; /* no NT SMB support fall into legacy open below */ |
| 379 | |
Steve French | a9d02ad | 2005-08-24 23:06:05 -0700 | [diff] [blame] | 380 | if (rc == -EIO) { |
| 381 | /* Old server, try legacy style OpenX */ |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 382 | rc = SMBLegacyOpen(xid, tcon, full_path, disposition, |
Steve French | a9d02ad | 2005-08-24 23:06:05 -0700 | [diff] [blame] | 383 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
| 384 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
| 385 | & CIFS_MOUNT_MAP_SPECIAL_CHR); |
| 386 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | if (rc) { |
Steve French | 26a21b9 | 2006-05-31 18:05:34 +0000 | [diff] [blame] | 388 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | goto out; |
| 390 | } |
Jeff Layton | 3321b79 | 2009-09-25 09:53:37 -0400 | [diff] [blame] | 391 | |
Jeff Layton | 086f68b | 2009-09-21 14:08:18 -0400 | [diff] [blame] | 392 | pCifsFile = cifs_new_fileinfo(inode, netfid, file, file->f_path.mnt, |
| 393 | file->f_flags); |
| 394 | file->private_data = pCifsFile; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | if (file->private_data == NULL) { |
| 396 | rc = -ENOMEM; |
| 397 | goto out; |
| 398 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | |
Jeff Layton | 3321b79 | 2009-09-25 09:53:37 -0400 | [diff] [blame] | 400 | rc = cifs_open_inode_helper(inode, file, pCifsInode, pCifsFile, tcon, |
| 401 | &oplock, buf, full_path, xid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 403 | if (oplock & CIFS_CREATE_ACTION) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | /* time to set mode which we can not set earlier due to |
| 405 | problems creating new read-only files */ |
Steve French | 276a74a | 2009-03-03 18:00:34 +0000 | [diff] [blame] | 406 | if (tcon->unix_ext) { |
Jeff Layton | 4e1e7fb | 2008-08-02 07:26:12 -0400 | [diff] [blame] | 407 | struct cifs_unix_set_info_args args = { |
| 408 | .mode = inode->i_mode, |
| 409 | .uid = NO_CHANGE_64, |
| 410 | .gid = NO_CHANGE_64, |
| 411 | .ctime = NO_CHANGE_64, |
| 412 | .atime = NO_CHANGE_64, |
| 413 | .mtime = NO_CHANGE_64, |
| 414 | .device = 0, |
| 415 | }; |
Jeff Layton | 01ea95e | 2009-07-09 20:02:49 -0400 | [diff] [blame] | 416 | CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, |
| 417 | cifs_sb->local_nls, |
| 418 | cifs_sb->mnt_cifs_flags & |
Steve French | 737b758 | 2005-04-28 22:41:06 -0700 | [diff] [blame] | 419 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | } |
| 421 | } |
| 422 | |
| 423 | out: |
| 424 | kfree(buf); |
| 425 | kfree(full_path); |
| 426 | FreeXid(xid); |
| 427 | return rc; |
| 428 | } |
| 429 | |
Adrian Bunk | 0418726 | 2006-06-30 18:23:04 +0200 | [diff] [blame] | 430 | /* Try to reacquire byte range locks that were released when session */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | /* to server was lost */ |
| 432 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) |
| 433 | { |
| 434 | int rc = 0; |
| 435 | |
| 436 | /* BB list all locks open on this file and relock */ |
| 437 | |
| 438 | return rc; |
| 439 | } |
| 440 | |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 441 | static int cifs_reopen_file(struct file *file, bool can_flush) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | { |
| 443 | int rc = -EACCES; |
Jeff Layton | 590a3fe | 2009-09-12 11:54:28 -0400 | [diff] [blame] | 444 | int xid; |
| 445 | __u32 oplock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | struct cifs_sb_info *cifs_sb; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 447 | struct cifsTconInfo *tcon; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | struct cifsFileInfo *pCifsFile; |
| 449 | struct cifsInodeInfo *pCifsInode; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 450 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | char *full_path = NULL; |
| 452 | int desiredAccess; |
| 453 | int disposition = FILE_OPEN; |
| 454 | __u16 netfid; |
| 455 | |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 456 | if (file->private_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | pCifsFile = (struct cifsFileInfo *)file->private_data; |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 458 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | return -EBADF; |
| 460 | |
| 461 | xid = GetXid(); |
Jeff Layton | f0a71eb | 2009-06-27 07:04:55 -0400 | [diff] [blame] | 462 | mutex_lock(&pCifsFile->fh_mutex); |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 463 | if (!pCifsFile->invalidHandle) { |
Jeff Layton | f0a71eb | 2009-06-27 07:04:55 -0400 | [diff] [blame] | 464 | mutex_unlock(&pCifsFile->fh_mutex); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 465 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | FreeXid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 467 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | } |
| 469 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 470 | if (file->f_path.dentry == NULL) { |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 471 | cERROR(1, ("no valid name if dentry freed")); |
| 472 | dump_stack(); |
| 473 | rc = -EBADF; |
| 474 | goto reopen_error_exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | } |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 476 | |
| 477 | inode = file->f_path.dentry->d_inode; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 478 | if (inode == NULL) { |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 479 | cERROR(1, ("inode not valid")); |
| 480 | dump_stack(); |
| 481 | rc = -EBADF; |
| 482 | goto reopen_error_exit; |
| 483 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 484 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | cifs_sb = CIFS_SB(inode->i_sb); |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 486 | tcon = cifs_sb->tcon; |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 487 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | /* can not grab rename sem here because various ops, including |
| 489 | those that already have the rename sem can end up causing writepage |
| 490 | to get called and if the server was down that means we end up here, |
| 491 | and we can never tell if the caller already has the rename_sem */ |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 492 | full_path = build_path_from_dentry(file->f_path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | if (full_path == NULL) { |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 494 | rc = -ENOMEM; |
| 495 | reopen_error_exit: |
Jeff Layton | f0a71eb | 2009-06-27 07:04:55 -0400 | [diff] [blame] | 496 | mutex_unlock(&pCifsFile->fh_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | FreeXid(xid); |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 498 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | } |
| 500 | |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 501 | cFYI(1, ("inode = 0x%p file flags 0x%x for %s", |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 502 | inode, file->f_flags, full_path)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | |
| 504 | if (oplockEnabled) |
| 505 | oplock = REQ_OPLOCK; |
| 506 | else |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 507 | oplock = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 509 | if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) && |
| 510 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
| 511 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
| 512 | int oflags = (int) cifs_posix_convert_flags(file->f_flags); |
| 513 | /* can not refresh inode info since size could be stale */ |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 514 | rc = cifs_posix_open(full_path, NULL, file->f_path.mnt, |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 515 | cifs_sb->mnt_file_mode /* ignored */, |
| 516 | oflags, &oplock, &netfid, xid); |
| 517 | if (rc == 0) { |
| 518 | cFYI(1, ("posix reopen succeeded")); |
| 519 | goto reopen_success; |
| 520 | } |
| 521 | /* fallthrough to retry open the old way on errors, especially |
| 522 | in the reconnect path it is important to retry hard */ |
| 523 | } |
| 524 | |
| 525 | desiredAccess = cifs_convert_flags(file->f_flags); |
| 526 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | /* Can not refresh inode by passing in file_info buf to be returned |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 528 | by SMBOpen and then calling get_inode_info with returned buf |
| 529 | since file might have write behind data that needs to be flushed |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | and server version of file size can be stale. If we knew for sure |
| 531 | that inode was not dirty locally we could do this */ |
| 532 | |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 533 | rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 535 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
Steve French | 737b758 | 2005-04-28 22:41:06 -0700 | [diff] [blame] | 536 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | if (rc) { |
Jeff Layton | f0a71eb | 2009-06-27 07:04:55 -0400 | [diff] [blame] | 538 | mutex_unlock(&pCifsFile->fh_mutex); |
Steve French | 26a21b9 | 2006-05-31 18:05:34 +0000 | [diff] [blame] | 539 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
| 540 | cFYI(1, ("oplock: %d", oplock)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | } else { |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 542 | reopen_success: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | pCifsFile->netfid = netfid; |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 544 | pCifsFile->invalidHandle = false; |
Jeff Layton | f0a71eb | 2009-06-27 07:04:55 -0400 | [diff] [blame] | 545 | mutex_unlock(&pCifsFile->fh_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | pCifsInode = CIFS_I(inode); |
| 547 | if (pCifsInode) { |
| 548 | if (can_flush) { |
Jeff Layton | cea2180 | 2007-11-20 23:19:03 +0000 | [diff] [blame] | 549 | rc = filemap_write_and_wait(inode->i_mapping); |
| 550 | if (rc != 0) |
| 551 | CIFS_I(inode)->write_behind_rc = rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | /* temporarily disable caching while we |
| 553 | go to server to get inode info */ |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 554 | pCifsInode->clientCanCacheAll = false; |
| 555 | pCifsInode->clientCanCacheRead = false; |
Steve French | 7fc8f4e | 2009-02-23 20:43:11 +0000 | [diff] [blame] | 556 | if (tcon->unix_ext) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | rc = cifs_get_inode_info_unix(&inode, |
| 558 | full_path, inode->i_sb, xid); |
| 559 | else |
| 560 | rc = cifs_get_inode_info(&inode, |
| 561 | full_path, NULL, inode->i_sb, |
Steve French | 8b1327f | 2008-03-14 22:37:16 +0000 | [diff] [blame] | 562 | xid, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } /* else we are writing out data to server already |
| 564 | and could deadlock if we tried to flush data, and |
| 565 | since we do not know if we have data that would |
| 566 | invalidate the current end of file on the server |
| 567 | we can not go to the server to get the new inod |
| 568 | info */ |
| 569 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 570 | pCifsInode->clientCanCacheAll = true; |
| 571 | pCifsInode->clientCanCacheRead = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 573 | file->f_path.dentry->d_inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 575 | pCifsInode->clientCanCacheRead = true; |
| 576 | pCifsInode->clientCanCacheAll = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | } else { |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 578 | pCifsInode->clientCanCacheRead = false; |
| 579 | pCifsInode->clientCanCacheAll = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | } |
| 581 | cifs_relock_file(pCifsFile); |
| 582 | } |
| 583 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | kfree(full_path); |
| 585 | FreeXid(xid); |
| 586 | return rc; |
| 587 | } |
| 588 | |
| 589 | int cifs_close(struct inode *inode, struct file *file) |
| 590 | { |
| 591 | int rc = 0; |
Steve French | 1574532 | 2007-09-07 22:23:48 +0000 | [diff] [blame] | 592 | int xid, timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | struct cifs_sb_info *cifs_sb; |
| 594 | struct cifsTconInfo *pTcon; |
| 595 | struct cifsFileInfo *pSMBFile = |
| 596 | (struct cifsFileInfo *)file->private_data; |
| 597 | |
| 598 | xid = GetXid(); |
| 599 | |
| 600 | cifs_sb = CIFS_SB(inode->i_sb); |
| 601 | pTcon = cifs_sb->tcon; |
| 602 | if (pSMBFile) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 603 | struct cifsLockInfo *li, *tmp; |
Steve French | ddb4cbf | 2008-11-20 20:00:44 +0000 | [diff] [blame] | 604 | write_lock(&GlobalSMBSeslock); |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 605 | pSMBFile->closePend = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | if (pTcon) { |
| 607 | /* no sense reconnecting to close a file that is |
| 608 | already closed */ |
Steve French | 3b79521 | 2008-11-13 19:45:32 +0000 | [diff] [blame] | 609 | if (!pTcon->need_reconnect) { |
Steve French | ddb4cbf | 2008-11-20 20:00:44 +0000 | [diff] [blame] | 610 | write_unlock(&GlobalSMBSeslock); |
Steve French | 1574532 | 2007-09-07 22:23:48 +0000 | [diff] [blame] | 611 | timeout = 2; |
Dave Kleikamp | 6ab409b | 2009-08-31 11:07:12 -0400 | [diff] [blame] | 612 | while ((atomic_read(&pSMBFile->count) != 1) |
Steve French | 1574532 | 2007-09-07 22:23:48 +0000 | [diff] [blame] | 613 | && (timeout <= 2048)) { |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 614 | /* Give write a better chance to get to |
| 615 | server ahead of the close. We do not |
| 616 | want to add a wait_q here as it would |
| 617 | increase the memory utilization as |
| 618 | the struct would be in each open file, |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 619 | but this should give enough time to |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 620 | clear the socket */ |
Steve French | 90c81e0 | 2008-02-12 20:32:36 +0000 | [diff] [blame] | 621 | cFYI(DBG2, |
| 622 | ("close delay, write pending")); |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 623 | msleep(timeout); |
| 624 | timeout *= 4; |
Steve French | 4891d53 | 2006-11-07 16:31:16 +0000 | [diff] [blame] | 625 | } |
Steve French | ddb4cbf | 2008-11-20 20:00:44 +0000 | [diff] [blame] | 626 | if (!pTcon->need_reconnect && |
| 627 | !pSMBFile->invalidHandle) |
| 628 | rc = CIFSSMBClose(xid, pTcon, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | pSMBFile->netfid); |
Steve French | ddb4cbf | 2008-11-20 20:00:44 +0000 | [diff] [blame] | 630 | } else |
| 631 | write_unlock(&GlobalSMBSeslock); |
| 632 | } else |
| 633 | write_unlock(&GlobalSMBSeslock); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 634 | |
| 635 | /* Delete any outstanding lock records. |
| 636 | We'll lose them when the file is closed anyway. */ |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 637 | mutex_lock(&pSMBFile->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 638 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
| 639 | list_del(&li->llist); |
| 640 | kfree(li); |
| 641 | } |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 642 | mutex_unlock(&pSMBFile->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 643 | |
Steve French | cbe0476 | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 644 | write_lock(&GlobalSMBSeslock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | list_del(&pSMBFile->flist); |
| 646 | list_del(&pSMBFile->tlist); |
Steve French | cbe0476 | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 647 | write_unlock(&GlobalSMBSeslock); |
Dave Kleikamp | 6ab409b | 2009-08-31 11:07:12 -0400 | [diff] [blame] | 648 | cifsFileInfo_put(file->private_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | file->private_data = NULL; |
| 650 | } else |
| 651 | rc = -EBADF; |
| 652 | |
Steve French | 4efa53f | 2007-09-11 05:50:53 +0000 | [diff] [blame] | 653 | read_lock(&GlobalSMBSeslock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
| 655 | cFYI(1, ("closing last open instance for inode %p", inode)); |
| 656 | /* if the file is not open we do not know if we can cache info |
| 657 | on this inode, much less write behind and read ahead */ |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 658 | CIFS_I(inode)->clientCanCacheRead = false; |
| 659 | CIFS_I(inode)->clientCanCacheAll = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | } |
Steve French | 4efa53f | 2007-09-11 05:50:53 +0000 | [diff] [blame] | 661 | read_unlock(&GlobalSMBSeslock); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 662 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | rc = CIFS_I(inode)->write_behind_rc; |
| 664 | FreeXid(xid); |
| 665 | return rc; |
| 666 | } |
| 667 | |
| 668 | int cifs_closedir(struct inode *inode, struct file *file) |
| 669 | { |
| 670 | int rc = 0; |
| 671 | int xid; |
| 672 | struct cifsFileInfo *pCFileStruct = |
| 673 | (struct cifsFileInfo *)file->private_data; |
| 674 | char *ptmp; |
| 675 | |
Steve French | 26a21b9 | 2006-05-31 18:05:34 +0000 | [diff] [blame] | 676 | cFYI(1, ("Closedir inode = 0x%p", inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
| 678 | xid = GetXid(); |
| 679 | |
| 680 | if (pCFileStruct) { |
| 681 | struct cifsTconInfo *pTcon; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 682 | struct cifs_sb_info *cifs_sb = |
| 683 | CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
| 685 | pTcon = cifs_sb->tcon; |
| 686 | |
| 687 | cFYI(1, ("Freeing private data in close dir")); |
Steve French | ddb4cbf | 2008-11-20 20:00:44 +0000 | [diff] [blame] | 688 | write_lock(&GlobalSMBSeslock); |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 689 | if (!pCFileStruct->srch_inf.endOfSearch && |
| 690 | !pCFileStruct->invalidHandle) { |
| 691 | pCFileStruct->invalidHandle = true; |
Steve French | ddb4cbf | 2008-11-20 20:00:44 +0000 | [diff] [blame] | 692 | write_unlock(&GlobalSMBSeslock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
| 694 | cFYI(1, ("Closing uncompleted readdir with rc %d", |
| 695 | rc)); |
| 696 | /* not much we can do if it fails anyway, ignore rc */ |
| 697 | rc = 0; |
Steve French | ddb4cbf | 2008-11-20 20:00:44 +0000 | [diff] [blame] | 698 | } else |
| 699 | write_unlock(&GlobalSMBSeslock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
| 701 | if (ptmp) { |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 702 | cFYI(1, ("closedir free smb buf in srch struct")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 704 | if (pCFileStruct->srch_inf.smallBuf) |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 705 | cifs_small_buf_release(ptmp); |
| 706 | else |
| 707 | cifs_buf_release(ptmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | kfree(file->private_data); |
| 710 | file->private_data = NULL; |
| 711 | } |
| 712 | /* BB can we lock the filestruct while this is going on? */ |
| 713 | FreeXid(xid); |
| 714 | return rc; |
| 715 | } |
| 716 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 717 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
| 718 | __u64 offset, __u8 lockType) |
| 719 | { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 720 | struct cifsLockInfo *li = |
| 721 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 722 | if (li == NULL) |
| 723 | return -ENOMEM; |
| 724 | li->offset = offset; |
| 725 | li->length = len; |
| 726 | li->type = lockType; |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 727 | mutex_lock(&fid->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 728 | list_add(&li->llist, &fid->llist); |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 729 | mutex_unlock(&fid->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 730 | return 0; |
| 731 | } |
| 732 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
| 734 | { |
| 735 | int rc, xid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | __u32 numLock = 0; |
| 737 | __u32 numUnlock = 0; |
| 738 | __u64 length; |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 739 | bool wait_flag = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | struct cifs_sb_info *cifs_sb; |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 741 | struct cifsTconInfo *tcon; |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 742 | __u16 netfid; |
| 743 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 744 | bool posix_locking = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
| 746 | length = 1 + pfLock->fl_end - pfLock->fl_start; |
| 747 | rc = -EACCES; |
| 748 | xid = GetXid(); |
| 749 | |
| 750 | cFYI(1, ("Lock parm: 0x%x flockflags: " |
| 751 | "0x%x flocktype: 0x%x start: %lld end: %lld", |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 752 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
| 753 | pfLock->fl_end)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | |
| 755 | if (pfLock->fl_flags & FL_POSIX) |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 756 | cFYI(1, ("Posix")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | if (pfLock->fl_flags & FL_FLOCK) |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 758 | cFYI(1, ("Flock")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | if (pfLock->fl_flags & FL_SLEEP) { |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 760 | cFYI(1, ("Blocking lock")); |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 761 | wait_flag = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | } |
| 763 | if (pfLock->fl_flags & FL_ACCESS) |
| 764 | cFYI(1, ("Process suspended by mandatory locking - " |
Steve French | 26a21b9 | 2006-05-31 18:05:34 +0000 | [diff] [blame] | 765 | "not implemented yet")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | if (pfLock->fl_flags & FL_LEASE) |
| 767 | cFYI(1, ("Lease on file - not implemented yet")); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 768 | if (pfLock->fl_flags & |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
| 770 | cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags)); |
| 771 | |
| 772 | if (pfLock->fl_type == F_WRLCK) { |
| 773 | cFYI(1, ("F_WRLCK ")); |
| 774 | numLock = 1; |
| 775 | } else if (pfLock->fl_type == F_UNLCK) { |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 776 | cFYI(1, ("F_UNLCK")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | numUnlock = 1; |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 778 | /* Check if unlock includes more than |
| 779 | one lock range */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | } else if (pfLock->fl_type == F_RDLCK) { |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 781 | cFYI(1, ("F_RDLCK")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
| 783 | numLock = 1; |
| 784 | } else if (pfLock->fl_type == F_EXLCK) { |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 785 | cFYI(1, ("F_EXLCK")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | numLock = 1; |
| 787 | } else if (pfLock->fl_type == F_SHLCK) { |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 788 | cFYI(1, ("F_SHLCK")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
| 790 | numLock = 1; |
| 791 | } else |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 792 | cFYI(1, ("Unknown type of lock")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 794 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 795 | tcon = cifs_sb->tcon; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | |
| 797 | if (file->private_data == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 798 | rc = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | FreeXid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 800 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | } |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 802 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 804 | if ((tcon->ses->capabilities & CAP_UNIX) && |
| 805 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
Steve French | acc18aa | 2008-12-02 18:53:55 +0000 | [diff] [blame] | 806 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 807 | posix_locking = 1; |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 808 | /* BB add code here to normalize offset and length to |
| 809 | account for negative length which we can not accept over the |
| 810 | wire */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | if (IS_GETLK(cmd)) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 812 | if (posix_locking) { |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 813 | int posix_lock_type; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 814 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 815 | posix_lock_type = CIFS_RDLCK; |
| 816 | else |
| 817 | posix_lock_type = CIFS_WRLCK; |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 818 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */, |
Steve French | fc94cdb | 2006-05-30 18:03:32 +0000 | [diff] [blame] | 819 | length, pfLock, |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 820 | posix_lock_type, wait_flag); |
| 821 | FreeXid(xid); |
| 822 | return rc; |
| 823 | } |
| 824 | |
| 825 | /* BB we could chain these into one lock request BB */ |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 826 | rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start, |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 827 | 0, 1, lockType, 0 /* wait flag */ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | if (rc == 0) { |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 829 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | pfLock->fl_start, 1 /* numUnlock */ , |
| 831 | 0 /* numLock */ , lockType, |
| 832 | 0 /* wait flag */ ); |
| 833 | pfLock->fl_type = F_UNLCK; |
| 834 | if (rc != 0) |
| 835 | cERROR(1, ("Error unlocking previously locked " |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 836 | "range %d during test of lock", rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | rc = 0; |
| 838 | |
| 839 | } else { |
| 840 | /* if rc == ERR_SHARING_VIOLATION ? */ |
| 841 | rc = 0; /* do not change lock type to unlock |
| 842 | since range in use */ |
| 843 | } |
| 844 | |
| 845 | FreeXid(xid); |
| 846 | return rc; |
| 847 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 848 | |
| 849 | if (!numLock && !numUnlock) { |
| 850 | /* if no lock or unlock then nothing |
| 851 | to do since we do not know what it is */ |
| 852 | FreeXid(xid); |
| 853 | return -EOPNOTSUPP; |
| 854 | } |
| 855 | |
| 856 | if (posix_locking) { |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 857 | int posix_lock_type; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 858 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 859 | posix_lock_type = CIFS_RDLCK; |
| 860 | else |
| 861 | posix_lock_type = CIFS_WRLCK; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 862 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 863 | if (numUnlock == 1) |
Steve French | beb84dc | 2006-03-03 23:36:34 +0000 | [diff] [blame] | 864 | posix_lock_type = CIFS_UNLCK; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 865 | |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 866 | rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */, |
Steve French | fc94cdb | 2006-05-30 18:03:32 +0000 | [diff] [blame] | 867 | length, pfLock, |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 868 | posix_lock_type, wait_flag); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 869 | } else { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 870 | struct cifsFileInfo *fid = |
| 871 | (struct cifsFileInfo *)file->private_data; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 872 | |
| 873 | if (numLock) { |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 874 | rc = CIFSSMBLock(xid, tcon, netfid, length, |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 875 | pfLock->fl_start, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 876 | 0, numLock, lockType, wait_flag); |
| 877 | |
| 878 | if (rc == 0) { |
| 879 | /* For Windows locks we must store them. */ |
| 880 | rc = store_file_lock(fid, length, |
| 881 | pfLock->fl_start, lockType); |
| 882 | } |
| 883 | } else if (numUnlock) { |
| 884 | /* For each stored lock that this unlock overlaps |
| 885 | completely, unlock it. */ |
| 886 | int stored_rc = 0; |
| 887 | struct cifsLockInfo *li, *tmp; |
| 888 | |
Steve French | 6b70c95 | 2006-09-21 07:35:29 +0000 | [diff] [blame] | 889 | rc = 0; |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 890 | mutex_lock(&fid->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 891 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
| 892 | if (pfLock->fl_start <= li->offset && |
Steve French | c19eb71 | 2007-08-24 03:22:48 +0000 | [diff] [blame] | 893 | (pfLock->fl_start + length) >= |
Jeff Layton | 39db810 | 2007-08-24 03:16:51 +0000 | [diff] [blame] | 894 | (li->offset + li->length)) { |
Steve French | 13a6e42 | 2008-12-02 17:24:33 +0000 | [diff] [blame] | 895 | stored_rc = CIFSSMBLock(xid, tcon, |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 896 | netfid, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 897 | li->length, li->offset, |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 898 | 1, 0, li->type, false); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 899 | if (stored_rc) |
| 900 | rc = stored_rc; |
| 901 | |
| 902 | list_del(&li->llist); |
| 903 | kfree(li); |
| 904 | } |
| 905 | } |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 906 | mutex_unlock(&fid->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 907 | } |
| 908 | } |
| 909 | |
Steve French | d634cc1 | 2005-08-26 14:42:59 -0500 | [diff] [blame] | 910 | if (pfLock->fl_flags & FL_POSIX) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | posix_lock_file_wait(file, pfLock); |
| 912 | FreeXid(xid); |
| 913 | return rc; |
| 914 | } |
| 915 | |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 916 | /* |
| 917 | * Set the timeout on write requests past EOF. For some servers (Windows) |
| 918 | * these calls can be very long. |
| 919 | * |
| 920 | * If we're writing >10M past the EOF we give a 180s timeout. Anything less |
| 921 | * than that gets a 45s timeout. Writes not past EOF get 15s timeouts. |
| 922 | * The 10M cutoff is totally arbitrary. A better scheme for this would be |
| 923 | * welcome if someone wants to suggest one. |
| 924 | * |
| 925 | * We may be able to do a better job with this if there were some way to |
| 926 | * declare that a file should be sparse. |
| 927 | */ |
| 928 | static int |
| 929 | cifs_write_timeout(struct cifsInodeInfo *cifsi, loff_t offset) |
| 930 | { |
| 931 | if (offset <= cifsi->server_eof) |
| 932 | return CIFS_STD_OP; |
| 933 | else if (offset > (cifsi->server_eof + (10 * 1024 * 1024))) |
| 934 | return CIFS_VLONG_OP; |
| 935 | else |
| 936 | return CIFS_LONG_OP; |
| 937 | } |
| 938 | |
| 939 | /* update the file size (if needed) after a write */ |
| 940 | static void |
| 941 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
| 942 | unsigned int bytes_written) |
| 943 | { |
| 944 | loff_t end_of_write = offset + bytes_written; |
| 945 | |
| 946 | if (end_of_write > cifsi->server_eof) |
| 947 | cifsi->server_eof = end_of_write; |
| 948 | } |
| 949 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
| 951 | size_t write_size, loff_t *poffset) |
| 952 | { |
| 953 | int rc = 0; |
| 954 | unsigned int bytes_written = 0; |
| 955 | unsigned int total_written; |
| 956 | struct cifs_sb_info *cifs_sb; |
| 957 | struct cifsTconInfo *pTcon; |
| 958 | int xid, long_op; |
| 959 | struct cifsFileInfo *open_file; |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 960 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 962 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | |
| 964 | pTcon = cifs_sb->tcon; |
| 965 | |
| 966 | /* cFYI(1, |
| 967 | (" write %d bytes to offset %lld of %s", write_size, |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 968 | *poffset, file->f_path.dentry->d_name.name)); */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | |
| 970 | if (file->private_data == NULL) |
| 971 | return -EBADF; |
Christoph Hellwig | c33f8d3 | 2007-04-02 18:47:20 +0000 | [diff] [blame] | 972 | open_file = (struct cifsFileInfo *) file->private_data; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 973 | |
Jeff Layton | 838726c | 2008-08-28 07:54:59 -0400 | [diff] [blame] | 974 | rc = generic_write_checks(file, poffset, &write_size, 0); |
| 975 | if (rc) |
| 976 | return rc; |
| 977 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | xid = GetXid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 980 | long_op = cifs_write_timeout(cifsi, *poffset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | for (total_written = 0; write_size > total_written; |
| 982 | total_written += bytes_written) { |
| 983 | rc = -EAGAIN; |
| 984 | while (rc == -EAGAIN) { |
| 985 | if (file->private_data == NULL) { |
| 986 | /* file has been closed on us */ |
| 987 | FreeXid(xid); |
| 988 | /* if we have gotten here we have written some data |
| 989 | and blocked, and the file has been freed on us while |
| 990 | we blocked so return what we managed to write */ |
| 991 | return total_written; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 992 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | if (open_file->closePend) { |
| 994 | FreeXid(xid); |
| 995 | if (total_written) |
| 996 | return total_written; |
| 997 | else |
| 998 | return -EBADF; |
| 999 | } |
| 1000 | if (open_file->invalidHandle) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | /* we could deadlock if we called |
| 1002 | filemap_fdatawait from here so tell |
| 1003 | reopen_file not to flush data to server |
| 1004 | now */ |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 1005 | rc = cifs_reopen_file(file, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | if (rc != 0) |
| 1007 | break; |
| 1008 | } |
| 1009 | |
| 1010 | rc = CIFSSMBWrite(xid, pTcon, |
| 1011 | open_file->netfid, |
| 1012 | min_t(const int, cifs_sb->wsize, |
| 1013 | write_size - total_written), |
| 1014 | *poffset, &bytes_written, |
| 1015 | NULL, write_data + total_written, long_op); |
| 1016 | } |
| 1017 | if (rc || (bytes_written == 0)) { |
| 1018 | if (total_written) |
| 1019 | break; |
| 1020 | else { |
| 1021 | FreeXid(xid); |
| 1022 | return rc; |
| 1023 | } |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1024 | } else { |
| 1025 | cifs_update_eof(cifsi, *poffset, bytes_written); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | *poffset += bytes_written; |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1027 | } |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 1028 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | 15 seconds is plenty */ |
| 1030 | } |
| 1031 | |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 1032 | cifs_stats_bytes_written(pTcon, total_written); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | |
| 1034 | /* since the write may have blocked check these pointers again */ |
Steve French | 3677db1 | 2007-02-26 16:46:11 +0000 | [diff] [blame] | 1035 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
| 1036 | struct inode *inode = file->f_path.dentry->d_inode; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1037 | /* Do not update local mtime - server will set its actual value on write |
| 1038 | * inode->i_ctime = inode->i_mtime = |
Steve French | 3677db1 | 2007-02-26 16:46:11 +0000 | [diff] [blame] | 1039 | * current_fs_time(inode->i_sb);*/ |
| 1040 | if (total_written > 0) { |
| 1041 | spin_lock(&inode->i_lock); |
| 1042 | if (*poffset > file->f_path.dentry->d_inode->i_size) |
| 1043 | i_size_write(file->f_path.dentry->d_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | *poffset); |
Steve French | 3677db1 | 2007-02-26 16:46:11 +0000 | [diff] [blame] | 1045 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | } |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1047 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | } |
| 1049 | FreeXid(xid); |
| 1050 | return total_written; |
| 1051 | } |
| 1052 | |
| 1053 | static ssize_t cifs_write(struct file *file, const char *write_data, |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1054 | size_t write_size, loff_t *poffset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | { |
| 1056 | int rc = 0; |
| 1057 | unsigned int bytes_written = 0; |
| 1058 | unsigned int total_written; |
| 1059 | struct cifs_sb_info *cifs_sb; |
| 1060 | struct cifsTconInfo *pTcon; |
| 1061 | int xid, long_op; |
| 1062 | struct cifsFileInfo *open_file; |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1063 | struct cifsInodeInfo *cifsi = CIFS_I(file->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1065 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | |
| 1067 | pTcon = cifs_sb->tcon; |
| 1068 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1069 | cFYI(1, ("write %zd bytes to offset %lld of %s", write_size, |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1070 | *poffset, file->f_path.dentry->d_name.name)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | |
| 1072 | if (file->private_data == NULL) |
| 1073 | return -EBADF; |
Christoph Hellwig | c33f8d3 | 2007-04-02 18:47:20 +0000 | [diff] [blame] | 1074 | open_file = (struct cifsFileInfo *)file->private_data; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1075 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | xid = GetXid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1078 | long_op = cifs_write_timeout(cifsi, *poffset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | for (total_written = 0; write_size > total_written; |
| 1080 | total_written += bytes_written) { |
| 1081 | rc = -EAGAIN; |
| 1082 | while (rc == -EAGAIN) { |
| 1083 | if (file->private_data == NULL) { |
| 1084 | /* file has been closed on us */ |
| 1085 | FreeXid(xid); |
| 1086 | /* if we have gotten here we have written some data |
| 1087 | and blocked, and the file has been freed on us |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1088 | while we blocked so return what we managed to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | write */ |
| 1090 | return total_written; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1091 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | if (open_file->closePend) { |
| 1093 | FreeXid(xid); |
| 1094 | if (total_written) |
| 1095 | return total_written; |
| 1096 | else |
| 1097 | return -EBADF; |
| 1098 | } |
| 1099 | if (open_file->invalidHandle) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | /* we could deadlock if we called |
| 1101 | filemap_fdatawait from here so tell |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1102 | reopen_file not to flush data to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | server now */ |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 1104 | rc = cifs_reopen_file(file, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | if (rc != 0) |
| 1106 | break; |
| 1107 | } |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1108 | if (experimEnabled || (pTcon->ses->server && |
| 1109 | ((pTcon->ses->server->secMode & |
Steve French | 0877583 | 2006-05-30 18:08:26 +0000 | [diff] [blame] | 1110 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
Steve French | c01f36a | 2006-05-30 18:05:10 +0000 | [diff] [blame] | 1111 | == 0))) { |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 1112 | struct kvec iov[2]; |
| 1113 | unsigned int len; |
| 1114 | |
Steve French | 0ae0efa | 2005-10-10 10:57:19 -0700 | [diff] [blame] | 1115 | len = min((size_t)cifs_sb->wsize, |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 1116 | write_size - total_written); |
| 1117 | /* iov[0] is reserved for smb header */ |
| 1118 | iov[1].iov_base = (char *)write_data + |
| 1119 | total_written; |
| 1120 | iov[1].iov_len = len; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 1121 | rc = CIFSSMBWrite2(xid, pTcon, |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 1122 | open_file->netfid, len, |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 1123 | *poffset, &bytes_written, |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 1124 | iov, 1, long_op); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 1125 | } else |
Steve French | 6080823 | 2006-04-22 15:53:05 +0000 | [diff] [blame] | 1126 | rc = CIFSSMBWrite(xid, pTcon, |
| 1127 | open_file->netfid, |
| 1128 | min_t(const int, cifs_sb->wsize, |
| 1129 | write_size - total_written), |
| 1130 | *poffset, &bytes_written, |
| 1131 | write_data + total_written, |
| 1132 | NULL, long_op); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | } |
| 1134 | if (rc || (bytes_written == 0)) { |
| 1135 | if (total_written) |
| 1136 | break; |
| 1137 | else { |
| 1138 | FreeXid(xid); |
| 1139 | return rc; |
| 1140 | } |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1141 | } else { |
| 1142 | cifs_update_eof(cifsi, *poffset, bytes_written); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | *poffset += bytes_written; |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1144 | } |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 1145 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | 15 seconds is plenty */ |
| 1147 | } |
| 1148 | |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 1149 | cifs_stats_bytes_written(pTcon, total_written); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | |
| 1151 | /* since the write may have blocked check these pointers again */ |
Steve French | 3677db1 | 2007-02-26 16:46:11 +0000 | [diff] [blame] | 1152 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
Steve French | 004c46b | 2007-02-17 04:34:13 +0000 | [diff] [blame] | 1153 | /*BB We could make this contingent on superblock ATIME flag too */ |
Steve French | 3677db1 | 2007-02-26 16:46:11 +0000 | [diff] [blame] | 1154 | /* file->f_path.dentry->d_inode->i_ctime = |
| 1155 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ |
| 1156 | if (total_written > 0) { |
| 1157 | spin_lock(&file->f_path.dentry->d_inode->i_lock); |
| 1158 | if (*poffset > file->f_path.dentry->d_inode->i_size) |
| 1159 | i_size_write(file->f_path.dentry->d_inode, |
| 1160 | *poffset); |
| 1161 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | } |
Steve French | 3677db1 | 2007-02-26 16:46:11 +0000 | [diff] [blame] | 1163 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | } |
| 1165 | FreeXid(xid); |
| 1166 | return total_written; |
| 1167 | } |
| 1168 | |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1169 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
| 1170 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) |
| 1171 | { |
| 1172 | struct cifsFileInfo *open_file = NULL; |
| 1173 | |
| 1174 | read_lock(&GlobalSMBSeslock); |
| 1175 | /* we could simply get the first_list_entry since write-only entries |
| 1176 | are always at the end of the list but since the first entry might |
| 1177 | have a close pending, we go through the whole list */ |
| 1178 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
| 1179 | if (open_file->closePend) |
| 1180 | continue; |
| 1181 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || |
| 1182 | (open_file->pfile->f_flags & O_RDONLY))) { |
| 1183 | if (!open_file->invalidHandle) { |
| 1184 | /* found a good file */ |
| 1185 | /* lock it so it will not be closed on us */ |
Dave Kleikamp | 6ab409b | 2009-08-31 11:07:12 -0400 | [diff] [blame] | 1186 | cifsFileInfo_get(open_file); |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1187 | read_unlock(&GlobalSMBSeslock); |
| 1188 | return open_file; |
| 1189 | } /* else might as well continue, and look for |
| 1190 | another, or simply have the caller reopen it |
| 1191 | again rather than trying to fix this handle */ |
| 1192 | } else /* write only file */ |
| 1193 | break; /* write only files are last so must be done */ |
| 1194 | } |
| 1195 | read_unlock(&GlobalSMBSeslock); |
| 1196 | return NULL; |
| 1197 | } |
| 1198 | #endif |
| 1199 | |
Steve French | dd99cd8 | 2005-10-05 19:32:49 -0700 | [diff] [blame] | 1200 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1201 | { |
| 1202 | struct cifsFileInfo *open_file; |
Jeff Layton | 2846d38 | 2008-09-22 21:33:33 -0400 | [diff] [blame] | 1203 | bool any_available = false; |
Steve French | dd99cd8 | 2005-10-05 19:32:49 -0700 | [diff] [blame] | 1204 | int rc; |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1205 | |
Steve French | 6080823 | 2006-04-22 15:53:05 +0000 | [diff] [blame] | 1206 | /* Having a null inode here (because mapping->host was set to zero by |
| 1207 | the VFS or MM) should not happen but we had reports of on oops (due to |
| 1208 | it being zero) during stress testcases so we need to check for it */ |
| 1209 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1210 | if (cifs_inode == NULL) { |
| 1211 | cERROR(1, ("Null inode passed to cifs_writeable_file")); |
Steve French | 6080823 | 2006-04-22 15:53:05 +0000 | [diff] [blame] | 1212 | dump_stack(); |
| 1213 | return NULL; |
| 1214 | } |
| 1215 | |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1216 | read_lock(&GlobalSMBSeslock); |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1217 | refind_writable: |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1218 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
Jeff Layton | 2846d38 | 2008-09-22 21:33:33 -0400 | [diff] [blame] | 1219 | if (open_file->closePend || |
| 1220 | (!any_available && open_file->pid != current->tgid)) |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1221 | continue; |
Jeff Layton | 2846d38 | 2008-09-22 21:33:33 -0400 | [diff] [blame] | 1222 | |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1223 | if (open_file->pfile && |
| 1224 | ((open_file->pfile->f_flags & O_RDWR) || |
| 1225 | (open_file->pfile->f_flags & O_WRONLY))) { |
Dave Kleikamp | 6ab409b | 2009-08-31 11:07:12 -0400 | [diff] [blame] | 1226 | cifsFileInfo_get(open_file); |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1227 | |
| 1228 | if (!open_file->invalidHandle) { |
| 1229 | /* found a good writable file */ |
| 1230 | read_unlock(&GlobalSMBSeslock); |
| 1231 | return open_file; |
| 1232 | } |
Steve French | 8840dee | 2007-11-16 23:05:52 +0000 | [diff] [blame] | 1233 | |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1234 | read_unlock(&GlobalSMBSeslock); |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1235 | /* Had to unlock since following call can block */ |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 1236 | rc = cifs_reopen_file(open_file->pfile, false); |
Steve French | 8840dee | 2007-11-16 23:05:52 +0000 | [diff] [blame] | 1237 | if (!rc) { |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1238 | if (!open_file->closePend) |
| 1239 | return open_file; |
| 1240 | else { /* start over in case this was deleted */ |
| 1241 | /* since the list could be modified */ |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1242 | read_lock(&GlobalSMBSeslock); |
Dave Kleikamp | 6ab409b | 2009-08-31 11:07:12 -0400 | [diff] [blame] | 1243 | cifsFileInfo_put(open_file); |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1244 | goto refind_writable; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1245 | } |
| 1246 | } |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1247 | |
| 1248 | /* if it fails, try another handle if possible - |
| 1249 | (we can not do this if closePending since |
| 1250 | loop could be modified - in which case we |
| 1251 | have to start at the beginning of the list |
| 1252 | again. Note that it would be bad |
| 1253 | to hold up writepages here (rather than |
| 1254 | in caller) with continuous retries */ |
| 1255 | cFYI(1, ("wp failed on reopen file")); |
| 1256 | read_lock(&GlobalSMBSeslock); |
| 1257 | /* can not use this handle, no write |
| 1258 | pending on this one after all */ |
Dave Kleikamp | 6ab409b | 2009-08-31 11:07:12 -0400 | [diff] [blame] | 1259 | cifsFileInfo_put(open_file); |
Steve French | 8840dee | 2007-11-16 23:05:52 +0000 | [diff] [blame] | 1260 | |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1261 | if (open_file->closePend) /* list could have changed */ |
| 1262 | goto refind_writable; |
| 1263 | /* else we simply continue to the next entry. Thus |
| 1264 | we do not loop on reopen errors. If we |
| 1265 | can not reopen the file, for example if we |
| 1266 | reconnected to a server with another client |
| 1267 | racing to delete or lock the file we would not |
| 1268 | make progress if we restarted before the beginning |
| 1269 | of the loop here. */ |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1270 | } |
| 1271 | } |
Jeff Layton | 2846d38 | 2008-09-22 21:33:33 -0400 | [diff] [blame] | 1272 | /* couldn't find useable FH with same pid, try any available */ |
| 1273 | if (!any_available) { |
| 1274 | any_available = true; |
| 1275 | goto refind_writable; |
| 1276 | } |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1277 | read_unlock(&GlobalSMBSeslock); |
| 1278 | return NULL; |
| 1279 | } |
| 1280 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
| 1282 | { |
| 1283 | struct address_space *mapping = page->mapping; |
| 1284 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 1285 | char *write_data; |
| 1286 | int rc = -EFAULT; |
| 1287 | int bytes_written = 0; |
| 1288 | struct cifs_sb_info *cifs_sb; |
| 1289 | struct cifsTconInfo *pTcon; |
| 1290 | struct inode *inode; |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1291 | struct cifsFileInfo *open_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | |
| 1293 | if (!mapping || !mapping->host) |
| 1294 | return -EFAULT; |
| 1295 | |
| 1296 | inode = page->mapping->host; |
| 1297 | cifs_sb = CIFS_SB(inode->i_sb); |
| 1298 | pTcon = cifs_sb->tcon; |
| 1299 | |
| 1300 | offset += (loff_t)from; |
| 1301 | write_data = kmap(page); |
| 1302 | write_data += from; |
| 1303 | |
| 1304 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { |
| 1305 | kunmap(page); |
| 1306 | return -EIO; |
| 1307 | } |
| 1308 | |
| 1309 | /* racing with truncate? */ |
| 1310 | if (offset > mapping->host->i_size) { |
| 1311 | kunmap(page); |
| 1312 | return 0; /* don't care */ |
| 1313 | } |
| 1314 | |
| 1315 | /* check to make sure that we are not extending the file */ |
| 1316 | if (mapping->host->i_size - offset < (loff_t)to) |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1317 | to = (unsigned)(mapping->host->i_size - offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1319 | open_file = find_writable_file(CIFS_I(mapping->host)); |
| 1320 | if (open_file) { |
| 1321 | bytes_written = cifs_write(open_file->pfile, write_data, |
| 1322 | to-from, &offset); |
Dave Kleikamp | 6ab409b | 2009-08-31 11:07:12 -0400 | [diff] [blame] | 1323 | cifsFileInfo_put(open_file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | /* Does mm or vfs already set times? */ |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1325 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
Steve French | bb5a9a0 | 2007-12-31 04:21:29 +0000 | [diff] [blame] | 1326 | if ((bytes_written > 0) && (offset)) |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1327 | rc = 0; |
Steve French | bb5a9a0 | 2007-12-31 04:21:29 +0000 | [diff] [blame] | 1328 | else if (bytes_written < 0) |
| 1329 | rc = bytes_written; |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1330 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | cFYI(1, ("No writeable filehandles for inode")); |
| 1332 | rc = -EIO; |
| 1333 | } |
| 1334 | |
| 1335 | kunmap(page); |
| 1336 | return rc; |
| 1337 | } |
| 1338 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | static int cifs_writepages(struct address_space *mapping, |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1340 | struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1342 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
| 1343 | unsigned int bytes_to_write; |
| 1344 | unsigned int bytes_written; |
| 1345 | struct cifs_sb_info *cifs_sb; |
| 1346 | int done = 0; |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1347 | pgoff_t end; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1348 | pgoff_t index; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1349 | int range_whole = 0; |
| 1350 | struct kvec *iov; |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1351 | int len; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1352 | int n_iov = 0; |
| 1353 | pgoff_t next; |
| 1354 | int nr_pages; |
| 1355 | __u64 offset = 0; |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1356 | struct cifsFileInfo *open_file; |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1357 | struct cifsInodeInfo *cifsi = CIFS_I(mapping->host); |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1358 | struct page *page; |
| 1359 | struct pagevec pvec; |
| 1360 | int rc = 0; |
| 1361 | int scanned = 0; |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1362 | int xid, long_op; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1364 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1365 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1366 | /* |
| 1367 | * If wsize is smaller that the page cache size, default to writing |
| 1368 | * one page at a time via cifs_writepage |
| 1369 | */ |
| 1370 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) |
| 1371 | return generic_writepages(mapping, wbc); |
| 1372 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1373 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
| 1374 | if (cifs_sb->tcon->ses->server->secMode & |
| 1375 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
| 1376 | if (!experimEnabled) |
Steve French | 6080823 | 2006-04-22 15:53:05 +0000 | [diff] [blame] | 1377 | return generic_writepages(mapping, wbc); |
Steve French | 4a77118 | 2005-10-05 15:14:33 -0700 | [diff] [blame] | 1378 | |
Steve French | 9a0c823 | 2007-02-02 04:21:57 +0000 | [diff] [blame] | 1379 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1380 | if (iov == NULL) |
Steve French | 9a0c823 | 2007-02-02 04:21:57 +0000 | [diff] [blame] | 1381 | return generic_writepages(mapping, wbc); |
| 1382 | |
| 1383 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1384 | /* |
| 1385 | * BB: Is this meaningful for a non-block-device file system? |
| 1386 | * If it is, we should test it again after we do I/O |
| 1387 | */ |
| 1388 | if (wbc->nonblocking && bdi_write_congested(bdi)) { |
| 1389 | wbc->encountered_congestion = 1; |
Steve French | 9a0c823 | 2007-02-02 04:21:57 +0000 | [diff] [blame] | 1390 | kfree(iov); |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1391 | return 0; |
| 1392 | } |
| 1393 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1394 | xid = GetXid(); |
| 1395 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1396 | pagevec_init(&pvec, 0); |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1397 | if (wbc->range_cyclic) { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1398 | index = mapping->writeback_index; /* Start from prev offset */ |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1399 | end = -1; |
| 1400 | } else { |
| 1401 | index = wbc->range_start >> PAGE_CACHE_SHIFT; |
| 1402 | end = wbc->range_end >> PAGE_CACHE_SHIFT; |
| 1403 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
| 1404 | range_whole = 1; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1405 | scanned = 1; |
| 1406 | } |
| 1407 | retry: |
| 1408 | while (!done && (index <= end) && |
| 1409 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, |
| 1410 | PAGECACHE_TAG_DIRTY, |
| 1411 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { |
| 1412 | int first; |
| 1413 | unsigned int i; |
| 1414 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1415 | first = -1; |
| 1416 | next = 0; |
| 1417 | n_iov = 0; |
| 1418 | bytes_to_write = 0; |
| 1419 | |
| 1420 | for (i = 0; i < nr_pages; i++) { |
| 1421 | page = pvec.pages[i]; |
| 1422 | /* |
| 1423 | * At this point we hold neither mapping->tree_lock nor |
| 1424 | * lock on the page itself: the page may be truncated or |
| 1425 | * invalidated (changing page->mapping to NULL), or even |
| 1426 | * swizzled back from swapper_space to tmpfs file |
| 1427 | * mapping |
| 1428 | */ |
| 1429 | |
| 1430 | if (first < 0) |
| 1431 | lock_page(page); |
Nick Piggin | 529ae9a | 2008-08-02 12:01:03 +0200 | [diff] [blame] | 1432 | else if (!trylock_page(page)) |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1433 | break; |
| 1434 | |
| 1435 | if (unlikely(page->mapping != mapping)) { |
| 1436 | unlock_page(page); |
| 1437 | break; |
| 1438 | } |
| 1439 | |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1440 | if (!wbc->range_cyclic && page->index > end) { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1441 | done = 1; |
| 1442 | unlock_page(page); |
| 1443 | break; |
| 1444 | } |
| 1445 | |
| 1446 | if (next && (page->index != next)) { |
| 1447 | /* Not next consecutive page */ |
| 1448 | unlock_page(page); |
| 1449 | break; |
| 1450 | } |
| 1451 | |
| 1452 | if (wbc->sync_mode != WB_SYNC_NONE) |
| 1453 | wait_on_page_writeback(page); |
| 1454 | |
| 1455 | if (PageWriteback(page) || |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1456 | !clear_page_dirty_for_io(page)) { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1457 | unlock_page(page); |
| 1458 | break; |
| 1459 | } |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1460 | |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1461 | /* |
| 1462 | * This actually clears the dirty bit in the radix tree. |
| 1463 | * See cifs_writepage() for more commentary. |
| 1464 | */ |
| 1465 | set_page_writeback(page); |
| 1466 | |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1467 | if (page_offset(page) >= mapping->host->i_size) { |
| 1468 | done = 1; |
| 1469 | unlock_page(page); |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1470 | end_page_writeback(page); |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1471 | break; |
| 1472 | } |
| 1473 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1474 | /* |
| 1475 | * BB can we get rid of this? pages are held by pvec |
| 1476 | */ |
| 1477 | page_cache_get(page); |
| 1478 | |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1479 | len = min(mapping->host->i_size - page_offset(page), |
| 1480 | (loff_t)PAGE_CACHE_SIZE); |
| 1481 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1482 | /* reserve iov[0] for the smb header */ |
| 1483 | n_iov++; |
| 1484 | iov[n_iov].iov_base = kmap(page); |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1485 | iov[n_iov].iov_len = len; |
| 1486 | bytes_to_write += len; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1487 | |
| 1488 | if (first < 0) { |
| 1489 | first = i; |
| 1490 | offset = page_offset(page); |
| 1491 | } |
| 1492 | next = page->index + 1; |
| 1493 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) |
| 1494 | break; |
| 1495 | } |
| 1496 | if (n_iov) { |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1497 | /* Search for a writable handle every time we call |
| 1498 | * CIFSSMBWrite2. We can't rely on the last handle |
| 1499 | * we used to still be valid |
| 1500 | */ |
| 1501 | open_file = find_writable_file(CIFS_I(mapping->host)); |
| 1502 | if (!open_file) { |
| 1503 | cERROR(1, ("No writable handles for inode")); |
| 1504 | rc = -EBADF; |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 1505 | } else { |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1506 | long_op = cifs_write_timeout(cifsi, offset); |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1507 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
| 1508 | open_file->netfid, |
| 1509 | bytes_to_write, offset, |
| 1510 | &bytes_written, iov, n_iov, |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1511 | long_op); |
Dave Kleikamp | 6ab409b | 2009-08-31 11:07:12 -0400 | [diff] [blame] | 1512 | cifsFileInfo_put(open_file); |
Jeff Layton | fbec9ab | 2009-04-03 13:44:00 -0400 | [diff] [blame] | 1513 | cifs_update_eof(cifsi, offset, bytes_written); |
| 1514 | |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1515 | if (rc || bytes_written < bytes_to_write) { |
Steve French | 63135e0 | 2007-07-17 17:34:02 +0000 | [diff] [blame] | 1516 | cERROR(1, ("Write2 ret %d, wrote %d", |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1517 | rc, bytes_written)); |
| 1518 | /* BB what if continued retry is |
| 1519 | requested via mount flags? */ |
Jeff Layton | cea2180 | 2007-11-20 23:19:03 +0000 | [diff] [blame] | 1520 | if (rc == -ENOSPC) |
| 1521 | set_bit(AS_ENOSPC, &mapping->flags); |
| 1522 | else |
| 1523 | set_bit(AS_EIO, &mapping->flags); |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1524 | } else { |
| 1525 | cifs_stats_bytes_written(cifs_sb->tcon, |
| 1526 | bytes_written); |
| 1527 | } |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1528 | } |
| 1529 | for (i = 0; i < n_iov; i++) { |
| 1530 | page = pvec.pages[first + i]; |
Steve French | eb9bdaa | 2006-01-27 15:11:47 -0800 | [diff] [blame] | 1531 | /* Should we also set page error on |
| 1532 | success rc but too little data written? */ |
| 1533 | /* BB investigate retry logic on temporary |
| 1534 | server crash cases and how recovery works |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1535 | when page marked as error */ |
| 1536 | if (rc) |
Steve French | eb9bdaa | 2006-01-27 15:11:47 -0800 | [diff] [blame] | 1537 | SetPageError(page); |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1538 | kunmap(page); |
| 1539 | unlock_page(page); |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1540 | end_page_writeback(page); |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1541 | page_cache_release(page); |
| 1542 | } |
| 1543 | if ((wbc->nr_to_write -= n_iov) <= 0) |
| 1544 | done = 1; |
| 1545 | index = next; |
Dave Kleikamp | b066a48 | 2008-11-18 03:49:05 +0000 | [diff] [blame] | 1546 | } else |
| 1547 | /* Need to re-find the pages we skipped */ |
| 1548 | index = pvec.pages[0]->index + 1; |
| 1549 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1550 | pagevec_release(&pvec); |
| 1551 | } |
| 1552 | if (!scanned && !done) { |
| 1553 | /* |
| 1554 | * We hit the last page and there is more work to be done: wrap |
| 1555 | * back to the start of the file |
| 1556 | */ |
| 1557 | scanned = 1; |
| 1558 | index = 0; |
| 1559 | goto retry; |
| 1560 | } |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1561 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1562 | mapping->writeback_index = index; |
| 1563 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | FreeXid(xid); |
Steve French | 9a0c823 | 2007-02-02 04:21:57 +0000 | [diff] [blame] | 1565 | kfree(iov); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | return rc; |
| 1567 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1569 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | { |
| 1571 | int rc = -EFAULT; |
| 1572 | int xid; |
| 1573 | |
| 1574 | xid = GetXid(); |
| 1575 | /* BB add check for wbc flags */ |
| 1576 | page_cache_get(page); |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 1577 | if (!PageUptodate(page)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | cFYI(1, ("ppw - page not up to date")); |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1579 | |
| 1580 | /* |
| 1581 | * Set the "writeback" flag, and clear "dirty" in the radix tree. |
| 1582 | * |
| 1583 | * A writepage() implementation always needs to do either this, |
| 1584 | * or re-dirty the page with "redirty_page_for_writepage()" in |
| 1585 | * the case of a failure. |
| 1586 | * |
| 1587 | * Just unlocking the page will cause the radix tree tag-bits |
| 1588 | * to fail to update with the state of the page correctly. |
| 1589 | */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1590 | set_page_writeback(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
| 1592 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ |
| 1593 | unlock_page(page); |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1594 | end_page_writeback(page); |
| 1595 | page_cache_release(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | FreeXid(xid); |
| 1597 | return rc; |
| 1598 | } |
| 1599 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1600 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
| 1601 | loff_t pos, unsigned len, unsigned copied, |
| 1602 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | { |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1604 | int rc; |
| 1605 | struct inode *inode = mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1607 | cFYI(1, ("write_end for page %p from pos %lld with %d bytes", |
| 1608 | page, pos, copied)); |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 1609 | |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 1610 | if (PageChecked(page)) { |
| 1611 | if (copied == len) |
| 1612 | SetPageUptodate(page); |
| 1613 | ClearPageChecked(page); |
| 1614 | } else if (!PageUptodate(page) && copied == PAGE_CACHE_SIZE) |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1615 | SetPageUptodate(page); |
| 1616 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1617 | if (!PageUptodate(page)) { |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1618 | char *page_data; |
| 1619 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
| 1620 | int xid; |
| 1621 | |
| 1622 | xid = GetXid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | /* this is probably better than directly calling |
| 1624 | partialpage_write since in this function the file handle is |
| 1625 | known which we might as well leverage */ |
| 1626 | /* BB check if anything else missing out of ppw |
| 1627 | such as updating last write time */ |
| 1628 | page_data = kmap(page); |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1629 | rc = cifs_write(file, page_data + offset, copied, &pos); |
| 1630 | /* if (rc < 0) should we set writebehind rc? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | kunmap(page); |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1632 | |
| 1633 | FreeXid(xid); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1634 | } else { |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1635 | rc = copied; |
| 1636 | pos += copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1637 | set_page_dirty(page); |
| 1638 | } |
| 1639 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 1640 | if (rc > 0) { |
| 1641 | spin_lock(&inode->i_lock); |
| 1642 | if (pos > inode->i_size) |
| 1643 | i_size_write(inode, pos); |
| 1644 | spin_unlock(&inode->i_lock); |
| 1645 | } |
| 1646 | |
| 1647 | unlock_page(page); |
| 1648 | page_cache_release(page); |
| 1649 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | return rc; |
| 1651 | } |
| 1652 | |
| 1653 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) |
| 1654 | { |
| 1655 | int xid; |
| 1656 | int rc = 0; |
Steve French | b298f22 | 2009-02-21 21:17:43 +0000 | [diff] [blame] | 1657 | struct cifsTconInfo *tcon; |
| 1658 | struct cifsFileInfo *smbfile = |
| 1659 | (struct cifsFileInfo *)file->private_data; |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1660 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1661 | |
| 1662 | xid = GetXid(); |
| 1663 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1664 | cFYI(1, ("Sync file - name: %s datasync: 0x%x", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | dentry->d_name.name, datasync)); |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1666 | |
Jeff Layton | cea2180 | 2007-11-20 23:19:03 +0000 | [diff] [blame] | 1667 | rc = filemap_write_and_wait(inode->i_mapping); |
| 1668 | if (rc == 0) { |
| 1669 | rc = CIFS_I(inode)->write_behind_rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | CIFS_I(inode)->write_behind_rc = 0; |
Steve French | b298f22 | 2009-02-21 21:17:43 +0000 | [diff] [blame] | 1671 | tcon = CIFS_SB(inode->i_sb)->tcon; |
Steve French | be65244 | 2009-02-23 15:21:59 +0000 | [diff] [blame] | 1672 | if (!rc && tcon && smbfile && |
Steve French | 4717bed | 2009-02-24 14:44:19 +0000 | [diff] [blame] | 1673 | !(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) |
Steve French | b298f22 | 2009-02-21 21:17:43 +0000 | [diff] [blame] | 1674 | rc = CIFSSMBFlush(xid, tcon, smbfile->netfid); |
Jeff Layton | cea2180 | 2007-11-20 23:19:03 +0000 | [diff] [blame] | 1675 | } |
Steve French | b298f22 | 2009-02-21 21:17:43 +0000 | [diff] [blame] | 1676 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | FreeXid(xid); |
| 1678 | return rc; |
| 1679 | } |
| 1680 | |
NeilBrown | 3978d717 | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 1681 | /* static void cifs_sync_page(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | { |
| 1683 | struct address_space *mapping; |
| 1684 | struct inode *inode; |
| 1685 | unsigned long index = page->index; |
| 1686 | unsigned int rpages = 0; |
| 1687 | int rc = 0; |
| 1688 | |
| 1689 | cFYI(1, ("sync page %p",page)); |
| 1690 | mapping = page->mapping; |
| 1691 | if (!mapping) |
| 1692 | return 0; |
| 1693 | inode = mapping->host; |
| 1694 | if (!inode) |
NeilBrown | 3978d717 | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 1695 | return; */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1697 | /* fill in rpages then |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
| 1699 | |
Steve French | 26a21b9 | 2006-05-31 18:05:34 +0000 | [diff] [blame] | 1700 | /* cFYI(1, ("rpages is %d for sync page of Index %ld", rpages, index)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | |
NeilBrown | 3978d717 | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 1702 | #if 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | if (rc < 0) |
| 1704 | return rc; |
| 1705 | return 0; |
NeilBrown | 3978d717 | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 1706 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | } */ |
| 1708 | |
| 1709 | /* |
| 1710 | * As file closes, flush all cached write data for this inode checking |
| 1711 | * for write behind errors. |
| 1712 | */ |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 1713 | int cifs_flush(struct file *file, fl_owner_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1714 | { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1715 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | int rc = 0; |
| 1717 | |
| 1718 | /* Rather than do the steps manually: |
| 1719 | lock the inode for writing |
| 1720 | loop through pages looking for write behind data (dirty pages) |
| 1721 | coalesce into contiguous 16K (or smaller) chunks to write to server |
| 1722 | send to server (prefer in parallel) |
| 1723 | deal with writebehind errors |
| 1724 | unlock inode for writing |
| 1725 | filemapfdatawrite appears easier for the time being */ |
| 1726 | |
| 1727 | rc = filemap_fdatawrite(inode->i_mapping); |
Jeff Layton | cea2180 | 2007-11-20 23:19:03 +0000 | [diff] [blame] | 1728 | /* reset wb rc if we were able to write out dirty pages */ |
| 1729 | if (!rc) { |
| 1730 | rc = CIFS_I(inode)->write_behind_rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1731 | CIFS_I(inode)->write_behind_rc = 0; |
Jeff Layton | cea2180 | 2007-11-20 23:19:03 +0000 | [diff] [blame] | 1732 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1733 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1734 | cFYI(1, ("Flush inode %p file %p rc %d", inode, file, rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | |
| 1736 | return rc; |
| 1737 | } |
| 1738 | |
| 1739 | ssize_t cifs_user_read(struct file *file, char __user *read_data, |
| 1740 | size_t read_size, loff_t *poffset) |
| 1741 | { |
| 1742 | int rc = -EACCES; |
| 1743 | unsigned int bytes_read = 0; |
| 1744 | unsigned int total_read = 0; |
| 1745 | unsigned int current_read_size; |
| 1746 | struct cifs_sb_info *cifs_sb; |
| 1747 | struct cifsTconInfo *pTcon; |
| 1748 | int xid; |
| 1749 | struct cifsFileInfo *open_file; |
| 1750 | char *smb_read_data; |
| 1751 | char __user *current_offset; |
| 1752 | struct smb_com_read_rsp *pSMBr; |
| 1753 | |
| 1754 | xid = GetXid(); |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1755 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1756 | pTcon = cifs_sb->tcon; |
| 1757 | |
| 1758 | if (file->private_data == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 1759 | rc = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | FreeXid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 1761 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | } |
| 1763 | open_file = (struct cifsFileInfo *)file->private_data; |
| 1764 | |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 1765 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | cFYI(1, ("attempting read on write only file instance")); |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 1767 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | for (total_read = 0, current_offset = read_data; |
| 1769 | read_size > total_read; |
| 1770 | total_read += bytes_read, current_offset += bytes_read) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1771 | current_read_size = min_t(const int, read_size - total_read, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1772 | cifs_sb->rsize); |
| 1773 | rc = -EAGAIN; |
| 1774 | smb_read_data = NULL; |
| 1775 | while (rc == -EAGAIN) { |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1776 | int buf_type = CIFS_NO_BUFFER; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1777 | if ((open_file->invalidHandle) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1778 | (!open_file->closePend)) { |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 1779 | rc = cifs_reopen_file(file, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | if (rc != 0) |
| 1781 | break; |
| 1782 | } |
Steve French | bfa0d75 | 2005-08-31 21:50:37 -0700 | [diff] [blame] | 1783 | rc = CIFSSMBRead(xid, pTcon, |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1784 | open_file->netfid, |
| 1785 | current_read_size, *poffset, |
| 1786 | &bytes_read, &smb_read_data, |
| 1787 | &buf_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1788 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | if (smb_read_data) { |
Steve French | 93544cc | 2006-02-14 22:30:52 -0600 | [diff] [blame] | 1790 | if (copy_to_user(current_offset, |
| 1791 | smb_read_data + |
| 1792 | 4 /* RFC1001 length field */ + |
| 1793 | le16_to_cpu(pSMBr->DataOffset), |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 1794 | bytes_read)) |
Steve French | 93544cc | 2006-02-14 22:30:52 -0600 | [diff] [blame] | 1795 | rc = -EFAULT; |
Steve French | 93544cc | 2006-02-14 22:30:52 -0600 | [diff] [blame] | 1796 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1797 | if (buf_type == CIFS_SMALL_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1798 | cifs_small_buf_release(smb_read_data); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1799 | else if (buf_type == CIFS_LARGE_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1800 | cifs_buf_release(smb_read_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1801 | smb_read_data = NULL; |
| 1802 | } |
| 1803 | } |
| 1804 | if (rc || (bytes_read == 0)) { |
| 1805 | if (total_read) { |
| 1806 | break; |
| 1807 | } else { |
| 1808 | FreeXid(xid); |
| 1809 | return rc; |
| 1810 | } |
| 1811 | } else { |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 1812 | cifs_stats_bytes_read(pTcon, bytes_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1813 | *poffset += bytes_read; |
| 1814 | } |
| 1815 | } |
| 1816 | FreeXid(xid); |
| 1817 | return total_read; |
| 1818 | } |
| 1819 | |
| 1820 | |
| 1821 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, |
| 1822 | loff_t *poffset) |
| 1823 | { |
| 1824 | int rc = -EACCES; |
| 1825 | unsigned int bytes_read = 0; |
| 1826 | unsigned int total_read; |
| 1827 | unsigned int current_read_size; |
| 1828 | struct cifs_sb_info *cifs_sb; |
| 1829 | struct cifsTconInfo *pTcon; |
| 1830 | int xid; |
| 1831 | char *current_offset; |
| 1832 | struct cifsFileInfo *open_file; |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1833 | int buf_type = CIFS_NO_BUFFER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | |
| 1835 | xid = GetXid(); |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1836 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | pTcon = cifs_sb->tcon; |
| 1838 | |
| 1839 | if (file->private_data == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 1840 | rc = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | FreeXid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 1842 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | } |
| 1844 | open_file = (struct cifsFileInfo *)file->private_data; |
| 1845 | |
| 1846 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
| 1847 | cFYI(1, ("attempting read on write only file instance")); |
| 1848 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1849 | for (total_read = 0, current_offset = read_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1850 | read_size > total_read; |
| 1851 | total_read += bytes_read, current_offset += bytes_read) { |
| 1852 | current_read_size = min_t(const int, read_size - total_read, |
| 1853 | cifs_sb->rsize); |
Steve French | f9f5c817 | 2005-09-15 23:06:38 -0700 | [diff] [blame] | 1854 | /* For windows me and 9x we do not want to request more |
| 1855 | than it negotiated since it will refuse the read then */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1856 | if ((pTcon->ses) && |
Steve French | f9f5c817 | 2005-09-15 23:06:38 -0700 | [diff] [blame] | 1857 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
| 1858 | current_read_size = min_t(const int, current_read_size, |
| 1859 | pTcon->ses->server->maxBuf - 128); |
| 1860 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1861 | rc = -EAGAIN; |
| 1862 | while (rc == -EAGAIN) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1863 | if ((open_file->invalidHandle) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1864 | (!open_file->closePend)) { |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 1865 | rc = cifs_reopen_file(file, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1866 | if (rc != 0) |
| 1867 | break; |
| 1868 | } |
Steve French | bfa0d75 | 2005-08-31 21:50:37 -0700 | [diff] [blame] | 1869 | rc = CIFSSMBRead(xid, pTcon, |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1870 | open_file->netfid, |
| 1871 | current_read_size, *poffset, |
| 1872 | &bytes_read, ¤t_offset, |
| 1873 | &buf_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | } |
| 1875 | if (rc || (bytes_read == 0)) { |
| 1876 | if (total_read) { |
| 1877 | break; |
| 1878 | } else { |
| 1879 | FreeXid(xid); |
| 1880 | return rc; |
| 1881 | } |
| 1882 | } else { |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 1883 | cifs_stats_bytes_read(pTcon, total_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | *poffset += bytes_read; |
| 1885 | } |
| 1886 | } |
| 1887 | FreeXid(xid); |
| 1888 | return total_read; |
| 1889 | } |
| 1890 | |
| 1891 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
| 1892 | { |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1893 | struct dentry *dentry = file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1894 | int rc, xid; |
| 1895 | |
| 1896 | xid = GetXid(); |
| 1897 | rc = cifs_revalidate(dentry); |
| 1898 | if (rc) { |
| 1899 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); |
| 1900 | FreeXid(xid); |
| 1901 | return rc; |
| 1902 | } |
| 1903 | rc = generic_file_mmap(file, vma); |
| 1904 | FreeXid(xid); |
| 1905 | return rc; |
| 1906 | } |
| 1907 | |
| 1908 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1909 | static void cifs_copy_cache_pages(struct address_space *mapping, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1910 | struct list_head *pages, int bytes_read, char *data, |
| 1911 | struct pagevec *plru_pvec) |
| 1912 | { |
| 1913 | struct page *page; |
| 1914 | char *target; |
| 1915 | |
| 1916 | while (bytes_read > 0) { |
| 1917 | if (list_empty(pages)) |
| 1918 | break; |
| 1919 | |
| 1920 | page = list_entry(pages->prev, struct page, lru); |
| 1921 | list_del(&page->lru); |
| 1922 | |
| 1923 | if (add_to_page_cache(page, mapping, page->index, |
| 1924 | GFP_KERNEL)) { |
| 1925 | page_cache_release(page); |
| 1926 | cFYI(1, ("Add page cache failed")); |
Steve French | 3079ca6 | 2005-06-09 14:44:07 -0700 | [diff] [blame] | 1927 | data += PAGE_CACHE_SIZE; |
| 1928 | bytes_read -= PAGE_CACHE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | continue; |
| 1930 | } |
| 1931 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1932 | target = kmap_atomic(page, KM_USER0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1933 | |
| 1934 | if (PAGE_CACHE_SIZE > bytes_read) { |
| 1935 | memcpy(target, data, bytes_read); |
| 1936 | /* zero the tail end of this partial page */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1937 | memset(target + bytes_read, 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | PAGE_CACHE_SIZE - bytes_read); |
| 1939 | bytes_read = 0; |
| 1940 | } else { |
| 1941 | memcpy(target, data, PAGE_CACHE_SIZE); |
| 1942 | bytes_read -= PAGE_CACHE_SIZE; |
| 1943 | } |
| 1944 | kunmap_atomic(target, KM_USER0); |
| 1945 | |
| 1946 | flush_dcache_page(page); |
| 1947 | SetPageUptodate(page); |
| 1948 | unlock_page(page); |
| 1949 | if (!pagevec_add(plru_pvec, page)) |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 1950 | __pagevec_lru_add_file(plru_pvec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1951 | data += PAGE_CACHE_SIZE; |
| 1952 | } |
| 1953 | return; |
| 1954 | } |
| 1955 | |
| 1956 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
| 1957 | struct list_head *page_list, unsigned num_pages) |
| 1958 | { |
| 1959 | int rc = -EACCES; |
| 1960 | int xid; |
| 1961 | loff_t offset; |
| 1962 | struct page *page; |
| 1963 | struct cifs_sb_info *cifs_sb; |
| 1964 | struct cifsTconInfo *pTcon; |
Steve French | 2c2130e | 2007-10-12 19:10:28 +0000 | [diff] [blame] | 1965 | unsigned int bytes_read = 0; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1966 | unsigned int read_size, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1967 | char *smb_read_data = NULL; |
| 1968 | struct smb_com_read_rsp *pSMBr; |
| 1969 | struct pagevec lru_pvec; |
| 1970 | struct cifsFileInfo *open_file; |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1971 | int buf_type = CIFS_NO_BUFFER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1972 | |
| 1973 | xid = GetXid(); |
| 1974 | if (file->private_data == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 1975 | rc = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | FreeXid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 1977 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1978 | } |
| 1979 | open_file = (struct cifsFileInfo *)file->private_data; |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1980 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1981 | pTcon = cifs_sb->tcon; |
Steve French | bfa0d75 | 2005-08-31 21:50:37 -0700 | [diff] [blame] | 1982 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1983 | pagevec_init(&lru_pvec, 0); |
Steve French | 61de800 | 2008-10-30 20:15:22 +0000 | [diff] [blame] | 1984 | cFYI(DBG2, ("rpages: num pages %d", num_pages)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1985 | for (i = 0; i < num_pages; ) { |
| 1986 | unsigned contig_pages; |
| 1987 | struct page *tmp_page; |
| 1988 | unsigned long expected_index; |
| 1989 | |
| 1990 | if (list_empty(page_list)) |
| 1991 | break; |
| 1992 | |
| 1993 | page = list_entry(page_list->prev, struct page, lru); |
| 1994 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 1995 | |
| 1996 | /* count adjacent pages that we will read into */ |
| 1997 | contig_pages = 0; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1998 | expected_index = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1999 | list_entry(page_list->prev, struct page, lru)->index; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2000 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2001 | if (tmp_page->index == expected_index) { |
| 2002 | contig_pages++; |
| 2003 | expected_index++; |
| 2004 | } else |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2005 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2006 | } |
| 2007 | if (contig_pages + i > num_pages) |
| 2008 | contig_pages = num_pages - i; |
| 2009 | |
| 2010 | /* for reads over a certain size could initiate async |
| 2011 | read ahead */ |
| 2012 | |
| 2013 | read_size = contig_pages * PAGE_CACHE_SIZE; |
| 2014 | /* Read size needs to be in multiples of one page */ |
| 2015 | read_size = min_t(const unsigned int, read_size, |
| 2016 | cifs_sb->rsize & PAGE_CACHE_MASK); |
Steve French | 90c81e0 | 2008-02-12 20:32:36 +0000 | [diff] [blame] | 2017 | cFYI(DBG2, ("rpages: read size 0x%x contiguous pages %d", |
Steve French | 75865f8c | 2007-06-24 18:30:48 +0000 | [diff] [blame] | 2018 | read_size, contig_pages)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | rc = -EAGAIN; |
| 2020 | while (rc == -EAGAIN) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2021 | if ((open_file->invalidHandle) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2022 | (!open_file->closePend)) { |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 2023 | rc = cifs_reopen_file(file, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2024 | if (rc != 0) |
| 2025 | break; |
| 2026 | } |
| 2027 | |
Steve French | bfa0d75 | 2005-08-31 21:50:37 -0700 | [diff] [blame] | 2028 | rc = CIFSSMBRead(xid, pTcon, |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 2029 | open_file->netfid, |
| 2030 | read_size, offset, |
| 2031 | &bytes_read, &smb_read_data, |
| 2032 | &buf_type); |
Steve French | a9d02ad | 2005-08-24 23:06:05 -0700 | [diff] [blame] | 2033 | /* BB more RC checks ? */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2034 | if (rc == -EAGAIN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2035 | if (smb_read_data) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2036 | if (buf_type == CIFS_SMALL_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 2037 | cifs_small_buf_release(smb_read_data); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2038 | else if (buf_type == CIFS_LARGE_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 2039 | cifs_buf_release(smb_read_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2040 | smb_read_data = NULL; |
| 2041 | } |
| 2042 | } |
| 2043 | } |
| 2044 | if ((rc < 0) || (smb_read_data == NULL)) { |
| 2045 | cFYI(1, ("Read error in readpages: %d", rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2046 | break; |
| 2047 | } else if (bytes_read > 0) { |
Andrew Morton | 6f88cc2 | 2006-12-10 02:19:44 -0800 | [diff] [blame] | 2048 | task_io_account_read(bytes_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2049 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
| 2050 | cifs_copy_cache_pages(mapping, page_list, bytes_read, |
| 2051 | smb_read_data + 4 /* RFC1001 hdr */ + |
| 2052 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); |
| 2053 | |
| 2054 | i += bytes_read >> PAGE_CACHE_SHIFT; |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 2055 | cifs_stats_bytes_read(pTcon, bytes_read); |
Steve French | 2c2130e | 2007-10-12 19:10:28 +0000 | [diff] [blame] | 2056 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | i++; /* account for partial page */ |
| 2058 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2059 | /* server copy of file can have smaller size |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2060 | than client */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2061 | /* BB do we need to verify this common case ? |
| 2062 | this case is ok - if we are at server EOF |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2063 | we will hit it on next read */ |
| 2064 | |
OGAWA Hirofumi | 05ac9d4 | 2006-11-02 22:07:08 -0800 | [diff] [blame] | 2065 | /* break; */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | } |
| 2067 | } else { |
| 2068 | cFYI(1, ("No bytes read (%d) at offset %lld . " |
| 2069 | "Cleaning remaining pages from readahead list", |
| 2070 | bytes_read, offset)); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2071 | /* BB turn off caching and do new lookup on |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2072 | file size at server? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | break; |
| 2074 | } |
| 2075 | if (smb_read_data) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2076 | if (buf_type == CIFS_SMALL_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 2077 | cifs_small_buf_release(smb_read_data); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2078 | else if (buf_type == CIFS_LARGE_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 2079 | cifs_buf_release(smb_read_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2080 | smb_read_data = NULL; |
| 2081 | } |
| 2082 | bytes_read = 0; |
| 2083 | } |
| 2084 | |
Rik van Riel | 4f98a2f | 2008-10-18 20:26:32 -0700 | [diff] [blame] | 2085 | pagevec_lru_add_file(&lru_pvec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2086 | |
| 2087 | /* need to free smb_read_data buf before exit */ |
| 2088 | if (smb_read_data) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2089 | if (buf_type == CIFS_SMALL_BUFFER) |
Steve French | 47c886b | 2006-01-18 14:20:39 -0800 | [diff] [blame] | 2090 | cifs_small_buf_release(smb_read_data); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2091 | else if (buf_type == CIFS_LARGE_BUFFER) |
Steve French | 47c886b | 2006-01-18 14:20:39 -0800 | [diff] [blame] | 2092 | cifs_buf_release(smb_read_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2093 | smb_read_data = NULL; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2094 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2095 | |
| 2096 | FreeXid(xid); |
| 2097 | return rc; |
| 2098 | } |
| 2099 | |
| 2100 | static int cifs_readpage_worker(struct file *file, struct page *page, |
| 2101 | loff_t *poffset) |
| 2102 | { |
| 2103 | char *read_data; |
| 2104 | int rc; |
| 2105 | |
| 2106 | page_cache_get(page); |
| 2107 | read_data = kmap(page); |
| 2108 | /* for reads over a certain size could initiate async read ahead */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2110 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | if (rc < 0) |
| 2113 | goto io_error; |
| 2114 | else |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2115 | cFYI(1, ("Bytes read %d", rc)); |
| 2116 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 2117 | file->f_path.dentry->d_inode->i_atime = |
| 2118 | current_fs_time(file->f_path.dentry->d_inode->i_sb); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2120 | if (PAGE_CACHE_SIZE > rc) |
| 2121 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); |
| 2122 | |
| 2123 | flush_dcache_page(page); |
| 2124 | SetPageUptodate(page); |
| 2125 | rc = 0; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2127 | io_error: |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2128 | kunmap(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2129 | page_cache_release(page); |
| 2130 | return rc; |
| 2131 | } |
| 2132 | |
| 2133 | static int cifs_readpage(struct file *file, struct page *page) |
| 2134 | { |
| 2135 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 2136 | int rc = -EACCES; |
| 2137 | int xid; |
| 2138 | |
| 2139 | xid = GetXid(); |
| 2140 | |
| 2141 | if (file->private_data == NULL) { |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 2142 | rc = -EBADF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2143 | FreeXid(xid); |
Suresh Jayaraman | 0f3bc09 | 2009-06-25 18:12:34 +0530 | [diff] [blame] | 2144 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2145 | } |
| 2146 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2147 | cFYI(1, ("readpage %p at offset %d 0x%x\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2148 | page, (int)offset, (int)offset)); |
| 2149 | |
| 2150 | rc = cifs_readpage_worker(file, page, &offset); |
| 2151 | |
| 2152 | unlock_page(page); |
| 2153 | |
| 2154 | FreeXid(xid); |
| 2155 | return rc; |
| 2156 | } |
| 2157 | |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 2158 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
| 2159 | { |
| 2160 | struct cifsFileInfo *open_file; |
| 2161 | |
| 2162 | read_lock(&GlobalSMBSeslock); |
| 2163 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
| 2164 | if (open_file->closePend) |
| 2165 | continue; |
| 2166 | if (open_file->pfile && |
| 2167 | ((open_file->pfile->f_flags & O_RDWR) || |
| 2168 | (open_file->pfile->f_flags & O_WRONLY))) { |
| 2169 | read_unlock(&GlobalSMBSeslock); |
| 2170 | return 1; |
| 2171 | } |
| 2172 | } |
| 2173 | read_unlock(&GlobalSMBSeslock); |
| 2174 | return 0; |
| 2175 | } |
| 2176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | /* We do not want to update the file size from server for inodes |
| 2178 | open for write - to avoid races with writepage extending |
| 2179 | the file - in the future we could consider allowing |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2180 | refreshing the inode only on increases in the file size |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | but this is tricky to do without racing with writebehind |
| 2182 | page caching in the current Linux kernel design */ |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 2183 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2184 | { |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 2185 | if (!cifsInode) |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 2186 | return true; |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 2187 | |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 2188 | if (is_inode_writable(cifsInode)) { |
| 2189 | /* This inode is open for write at least once */ |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 2190 | struct cifs_sb_info *cifs_sb; |
| 2191 | |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 2192 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
Steve French | ad7a292 | 2008-02-07 23:25:02 +0000 | [diff] [blame] | 2193 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2194 | /* since no page cache to corrupt on directio |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 2195 | we can change size safely */ |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 2196 | return true; |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 2197 | } |
| 2198 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2199 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 2200 | return true; |
Steve French | 7ba5263 | 2007-02-08 18:14:13 +0000 | [diff] [blame] | 2201 | |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 2202 | return false; |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 2203 | } else |
Steve French | 4b18f2a | 2008-04-29 00:06:05 +0000 | [diff] [blame] | 2204 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2205 | } |
| 2206 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2207 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
| 2208 | loff_t pos, unsigned len, unsigned flags, |
| 2209 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2210 | { |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2211 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
| 2212 | loff_t offset = pos & (PAGE_CACHE_SIZE - 1); |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 2213 | loff_t page_start = pos & PAGE_MASK; |
| 2214 | loff_t i_size; |
| 2215 | struct page *page; |
| 2216 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2217 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2218 | cFYI(1, ("write_begin from %lld len %d", (long long)pos, len)); |
| 2219 | |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 2220 | page = grab_cache_page_write_begin(mapping, index, flags); |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 2221 | if (!page) { |
| 2222 | rc = -ENOMEM; |
| 2223 | goto out; |
| 2224 | } |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2225 | |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 2226 | if (PageUptodate(page)) |
| 2227 | goto out; |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 2228 | |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 2229 | /* |
| 2230 | * If we write a full page it will be up to date, no need to read from |
| 2231 | * the server. If the write is short, we'll end up doing a sync write |
| 2232 | * instead. |
| 2233 | */ |
| 2234 | if (len == PAGE_CACHE_SIZE) |
| 2235 | goto out; |
| 2236 | |
| 2237 | /* |
| 2238 | * optimize away the read when we have an oplock, and we're not |
| 2239 | * expecting to use any of the data we'd be reading in. That |
| 2240 | * is, when the page lies beyond the EOF, or straddles the EOF |
| 2241 | * and the write will cover all of the existing data. |
| 2242 | */ |
| 2243 | if (CIFS_I(mapping->host)->clientCanCacheRead) { |
| 2244 | i_size = i_size_read(mapping->host); |
| 2245 | if (page_start >= i_size || |
| 2246 | (offset == 0 && (pos + len) >= i_size)) { |
| 2247 | zero_user_segments(page, 0, offset, |
| 2248 | offset + len, |
| 2249 | PAGE_CACHE_SIZE); |
| 2250 | /* |
| 2251 | * PageChecked means that the parts of the page |
| 2252 | * to which we're not writing are considered up |
| 2253 | * to date. Once the data is copied to the |
| 2254 | * page, it can be set uptodate. |
| 2255 | */ |
| 2256 | SetPageChecked(page); |
| 2257 | goto out; |
| 2258 | } |
| 2259 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2260 | |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2261 | if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 2262 | /* |
| 2263 | * might as well read a page, it is fast enough. If we get |
| 2264 | * an error, we don't need to return it. cifs_write_end will |
| 2265 | * do a sync write instead since PG_uptodate isn't set. |
| 2266 | */ |
| 2267 | cifs_readpage_worker(file, page, &page_start); |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 2268 | } else { |
| 2269 | /* we could try using another file handle if there is one - |
| 2270 | but how would we lock it to prevent close of that handle |
| 2271 | racing with this read? In any case |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2272 | this will be written out by write_end so is fine */ |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 2273 | } |
Jeff Layton | a98ee8c | 2008-11-26 19:32:33 +0000 | [diff] [blame] | 2274 | out: |
| 2275 | *pagep = page; |
| 2276 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2277 | } |
| 2278 | |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2279 | static void |
| 2280 | cifs_oplock_break(struct slow_work *work) |
| 2281 | { |
| 2282 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, |
| 2283 | oplock_break); |
| 2284 | struct inode *inode = cfile->pInode; |
| 2285 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
| 2286 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->mnt->mnt_sb); |
| 2287 | int rc, waitrc = 0; |
| 2288 | |
| 2289 | if (inode && S_ISREG(inode->i_mode)) { |
| 2290 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
| 2291 | if (cinode->clientCanCacheAll == 0) |
Al Viro | 8737c93 | 2009-12-24 06:47:55 -0500 | [diff] [blame] | 2292 | break_lease(inode, O_RDONLY); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2293 | else if (cinode->clientCanCacheRead == 0) |
Al Viro | 8737c93 | 2009-12-24 06:47:55 -0500 | [diff] [blame] | 2294 | break_lease(inode, O_WRONLY); |
Jeff Layton | 3bc303c | 2009-09-21 06:47:50 -0400 | [diff] [blame] | 2295 | #endif |
| 2296 | rc = filemap_fdatawrite(inode->i_mapping); |
| 2297 | if (cinode->clientCanCacheRead == 0) { |
| 2298 | waitrc = filemap_fdatawait(inode->i_mapping); |
| 2299 | invalidate_remote_inode(inode); |
| 2300 | } |
| 2301 | if (!rc) |
| 2302 | rc = waitrc; |
| 2303 | if (rc) |
| 2304 | cinode->write_behind_rc = rc; |
| 2305 | cFYI(1, ("Oplock flush inode %p rc %d", inode, rc)); |
| 2306 | } |
| 2307 | |
| 2308 | /* |
| 2309 | * releasing stale oplock after recent reconnect of smb session using |
| 2310 | * a now incorrect file handle is not a data integrity issue but do |
| 2311 | * not bother sending an oplock release if session to server still is |
| 2312 | * disconnected since oplock already released by the server |
| 2313 | */ |
| 2314 | if (!cfile->closePend && !cfile->oplock_break_cancelled) { |
| 2315 | rc = CIFSSMBLock(0, cifs_sb->tcon, cfile->netfid, 0, 0, 0, 0, |
| 2316 | LOCKING_ANDX_OPLOCK_RELEASE, false); |
| 2317 | cFYI(1, ("Oplock release rc = %d", rc)); |
| 2318 | } |
| 2319 | } |
| 2320 | |
| 2321 | static int |
| 2322 | cifs_oplock_break_get(struct slow_work *work) |
| 2323 | { |
| 2324 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, |
| 2325 | oplock_break); |
| 2326 | mntget(cfile->mnt); |
| 2327 | cifsFileInfo_get(cfile); |
| 2328 | return 0; |
| 2329 | } |
| 2330 | |
| 2331 | static void |
| 2332 | cifs_oplock_break_put(struct slow_work *work) |
| 2333 | { |
| 2334 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, |
| 2335 | oplock_break); |
| 2336 | mntput(cfile->mnt); |
| 2337 | cifsFileInfo_put(cfile); |
| 2338 | } |
| 2339 | |
| 2340 | const struct slow_work_ops cifs_oplock_break_ops = { |
| 2341 | .get_ref = cifs_oplock_break_get, |
| 2342 | .put_ref = cifs_oplock_break_put, |
| 2343 | .execute = cifs_oplock_break, |
| 2344 | }; |
| 2345 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 2346 | const struct address_space_operations cifs_addr_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2347 | .readpage = cifs_readpage, |
| 2348 | .readpages = cifs_readpages, |
| 2349 | .writepage = cifs_writepage, |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2350 | .writepages = cifs_writepages, |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2351 | .write_begin = cifs_write_begin, |
| 2352 | .write_end = cifs_write_end, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2353 | .set_page_dirty = __set_page_dirty_nobuffers, |
| 2354 | /* .sync_page = cifs_sync_page, */ |
| 2355 | /* .direct_IO = */ |
| 2356 | }; |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 2357 | |
| 2358 | /* |
| 2359 | * cifs_readpages requires the server to support a buffer large enough to |
| 2360 | * contain the header plus one complete page of data. Otherwise, we need |
| 2361 | * to leave cifs_readpages out of the address space operations. |
| 2362 | */ |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 2363 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 2364 | .readpage = cifs_readpage, |
| 2365 | .writepage = cifs_writepage, |
| 2366 | .writepages = cifs_writepages, |
Nick Piggin | d941477 | 2008-09-24 11:32:59 -0400 | [diff] [blame] | 2367 | .write_begin = cifs_write_begin, |
| 2368 | .write_end = cifs_write_end, |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 2369 | .set_page_dirty = __set_page_dirty_nobuffers, |
| 2370 | /* .sync_page = cifs_sync_page, */ |
| 2371 | /* .direct_IO = */ |
| 2372 | }; |