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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <asm/div64.h> |
| 34 | #include "cifsfs.h" |
| 35 | #include "cifspdu.h" |
| 36 | #include "cifsglob.h" |
| 37 | #include "cifsproto.h" |
| 38 | #include "cifs_unicode.h" |
| 39 | #include "cifs_debug.h" |
| 40 | #include "cifs_fs_sb.h" |
| 41 | |
| 42 | static inline struct cifsFileInfo *cifs_init_private( |
| 43 | struct cifsFileInfo *private_data, struct inode *inode, |
| 44 | struct file *file, __u16 netfid) |
| 45 | { |
| 46 | memset(private_data, 0, sizeof(struct cifsFileInfo)); |
| 47 | private_data->netfid = netfid; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 48 | private_data->pid = current->tgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | init_MUTEX(&private_data->fh_sem); |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 50 | mutex_init(&private_data->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 51 | INIT_LIST_HEAD(&private_data->llist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | private_data->pfile = file; /* needed for writepage */ |
| 53 | private_data->pInode = inode; |
| 54 | private_data->invalidHandle = FALSE; |
| 55 | private_data->closePend = FALSE; |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 56 | /* we have to track num writers to the inode, since writepages |
| 57 | does not tell us which handle the write is for so there can |
| 58 | be a close (overlapping with write) of the filehandle that |
| 59 | cifs_writepages chose to use */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 60 | atomic_set(&private_data->wrtPending, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
| 62 | return private_data; |
| 63 | } |
| 64 | |
| 65 | static inline int cifs_convert_flags(unsigned int flags) |
| 66 | { |
| 67 | if ((flags & O_ACCMODE) == O_RDONLY) |
| 68 | return GENERIC_READ; |
| 69 | else if ((flags & O_ACCMODE) == O_WRONLY) |
| 70 | return GENERIC_WRITE; |
| 71 | else if ((flags & O_ACCMODE) == O_RDWR) { |
| 72 | /* GENERIC_ALL is too much permission to request |
| 73 | can cause unnecessary access denied on create */ |
| 74 | /* return GENERIC_ALL; */ |
| 75 | return (GENERIC_READ | GENERIC_WRITE); |
| 76 | } |
| 77 | |
| 78 | return 0x20197; |
| 79 | } |
| 80 | |
| 81 | static inline int cifs_get_disposition(unsigned int flags) |
| 82 | { |
| 83 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
| 84 | return FILE_CREATE; |
| 85 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) |
| 86 | return FILE_OVERWRITE_IF; |
| 87 | else if ((flags & O_CREAT) == O_CREAT) |
| 88 | return FILE_OPEN_IF; |
Steve French | 55aa2e0 | 2006-05-30 18:09:31 +0000 | [diff] [blame] | 89 | else if ((flags & O_TRUNC) == O_TRUNC) |
| 90 | return FILE_OVERWRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | else |
| 92 | return FILE_OPEN; |
| 93 | } |
| 94 | |
| 95 | /* all arguments to this function must be checked for validity in caller */ |
| 96 | static inline int cifs_open_inode_helper(struct inode *inode, struct file *file, |
| 97 | struct cifsInodeInfo *pCifsInode, struct cifsFileInfo *pCifsFile, |
| 98 | struct cifsTconInfo *pTcon, int *oplock, FILE_ALL_INFO *buf, |
| 99 | char *full_path, int xid) |
| 100 | { |
| 101 | struct timespec temp; |
| 102 | int rc; |
| 103 | |
| 104 | /* want handles we can use to read with first |
| 105 | in the list so we do not have to walk the |
| 106 | list to search for one in prepare_write */ |
| 107 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 108 | list_add_tail(&pCifsFile->flist, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | &pCifsInode->openFileList); |
| 110 | } else { |
| 111 | list_add(&pCifsFile->flist, |
| 112 | &pCifsInode->openFileList); |
| 113 | } |
| 114 | write_unlock(&GlobalSMBSeslock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | if (pCifsInode->clientCanCacheRead) { |
| 116 | /* we have the inode open somewhere else |
| 117 | no need to discard cache data */ |
| 118 | goto client_can_cache; |
| 119 | } |
| 120 | |
| 121 | /* BB need same check in cifs_create too? */ |
| 122 | /* if not oplocked, invalidate inode pages if mtime or file |
| 123 | size changed */ |
| 124 | temp = cifs_NTtimeToUnix(le64_to_cpu(buf->LastWriteTime)); |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 125 | if (timespec_equal(&file->f_path.dentry->d_inode->i_mtime, &temp) && |
| 126 | (file->f_path.dentry->d_inode->i_size == |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | (loff_t)le64_to_cpu(buf->EndOfFile))) { |
| 128 | cFYI(1, ("inode unchanged on server")); |
| 129 | } else { |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 130 | if (file->f_path.dentry->d_inode->i_mapping) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | /* BB no need to lock inode until after invalidate |
| 132 | since namei code should already have it locked? */ |
Jeff Layton | cea2180 | 2007-11-20 23:19:03 +0000 | [diff] [blame] | 133 | rc = filemap_write_and_wait(file->f_path.dentry->d_inode->i_mapping); |
| 134 | if (rc != 0) |
| 135 | CIFS_I(file->f_path.dentry->d_inode)->write_behind_rc = rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | } |
| 137 | cFYI(1, ("invalidating remote inode since open detected it " |
| 138 | "changed")); |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 139 | invalidate_remote_inode(file->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | } |
| 141 | |
| 142 | client_can_cache: |
Steve French | c18c842 | 2007-07-18 23:21:09 +0000 | [diff] [blame] | 143 | if (pTcon->unix_ext) |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 144 | rc = cifs_get_inode_info_unix(&file->f_path.dentry->d_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | full_path, inode->i_sb, xid); |
| 146 | else |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 147 | rc = cifs_get_inode_info(&file->f_path.dentry->d_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | full_path, buf, inode->i_sb, xid); |
| 149 | |
| 150 | if ((*oplock & 0xF) == OPLOCK_EXCLUSIVE) { |
| 151 | pCifsInode->clientCanCacheAll = TRUE; |
| 152 | pCifsInode->clientCanCacheRead = TRUE; |
| 153 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 154 | file->f_path.dentry->d_inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | } else if ((*oplock & 0xF) == OPLOCK_READ) |
| 156 | pCifsInode->clientCanCacheRead = TRUE; |
| 157 | |
| 158 | return rc; |
| 159 | } |
| 160 | |
| 161 | int cifs_open(struct inode *inode, struct file *file) |
| 162 | { |
| 163 | int rc = -EACCES; |
| 164 | int xid, oplock; |
| 165 | struct cifs_sb_info *cifs_sb; |
| 166 | struct cifsTconInfo *pTcon; |
| 167 | struct cifsFileInfo *pCifsFile; |
| 168 | struct cifsInodeInfo *pCifsInode; |
| 169 | struct list_head *tmp; |
| 170 | char *full_path = NULL; |
| 171 | int desiredAccess; |
| 172 | int disposition; |
| 173 | __u16 netfid; |
| 174 | FILE_ALL_INFO *buf = NULL; |
| 175 | |
| 176 | xid = GetXid(); |
| 177 | |
| 178 | cifs_sb = CIFS_SB(inode->i_sb); |
| 179 | pTcon = cifs_sb->tcon; |
| 180 | |
| 181 | if (file->f_flags & O_CREAT) { |
| 182 | /* search inode for this file and fill in file->private_data */ |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 183 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | read_lock(&GlobalSMBSeslock); |
| 185 | list_for_each(tmp, &pCifsInode->openFileList) { |
| 186 | pCifsFile = list_entry(tmp, struct cifsFileInfo, |
| 187 | flist); |
| 188 | if ((pCifsFile->pfile == NULL) && |
| 189 | (pCifsFile->pid == current->tgid)) { |
| 190 | /* mode set in cifs_create */ |
| 191 | |
| 192 | /* needed for writepage */ |
| 193 | pCifsFile->pfile = file; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 194 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | file->private_data = pCifsFile; |
| 196 | break; |
| 197 | } |
| 198 | } |
| 199 | read_unlock(&GlobalSMBSeslock); |
| 200 | if (file->private_data != NULL) { |
| 201 | rc = 0; |
| 202 | FreeXid(xid); |
| 203 | return rc; |
| 204 | } else { |
| 205 | if (file->f_flags & O_EXCL) |
| 206 | cERROR(1, ("could not find file instance for " |
Steve French | 26a21b9 | 2006-05-31 18:05:34 +0000 | [diff] [blame] | 207 | "new file %p", file)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | } |
| 209 | } |
| 210 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 211 | full_path = build_path_from_dentry(file->f_path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | if (full_path == NULL) { |
| 213 | FreeXid(xid); |
| 214 | return -ENOMEM; |
| 215 | } |
| 216 | |
Steve French | 7521a3c | 2007-07-11 18:30:34 +0000 | [diff] [blame] | 217 | cFYI(1, ("inode = 0x%p file flags are 0x%x for %s", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | inode, file->f_flags, full_path)); |
| 219 | desiredAccess = cifs_convert_flags(file->f_flags); |
| 220 | |
| 221 | /********************************************************************* |
| 222 | * open flag mapping table: |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 223 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | * POSIX Flag CIFS Disposition |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 225 | * ---------- ---------------- |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | * O_CREAT FILE_OPEN_IF |
| 227 | * O_CREAT | O_EXCL FILE_CREATE |
| 228 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF |
| 229 | * O_TRUNC FILE_OVERWRITE |
| 230 | * none of the above FILE_OPEN |
| 231 | * |
| 232 | * Note that there is not a direct match between disposition |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 233 | * FILE_SUPERSEDE (ie create whether or not file exists although |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | * O_CREAT | O_TRUNC is similar but truncates the existing |
| 235 | * file rather than creating a new file as FILE_SUPERSEDE does |
| 236 | * (which uses the attributes / metadata passed in on open call) |
| 237 | *? |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 238 | *? O_SYNC is a reasonable match to CIFS writethrough flag |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | *? and the read write flags match reasonably. O_LARGEFILE |
| 240 | *? is irrelevant because largefile support is always used |
| 241 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, |
| 242 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation |
| 243 | *********************************************************************/ |
| 244 | |
| 245 | disposition = cifs_get_disposition(file->f_flags); |
| 246 | |
| 247 | if (oplockEnabled) |
| 248 | oplock = REQ_OPLOCK; |
| 249 | else |
| 250 | oplock = FALSE; |
| 251 | |
| 252 | /* BB pass O_SYNC flag through on file attributes .. BB */ |
| 253 | |
| 254 | /* Also refresh inode by passing in file_info buf returned by SMBOpen |
| 255 | and calling get_inode_info with returned buf (at least helps |
| 256 | non-Unix server case) */ |
| 257 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 258 | /* BB we can not do this if this is the second open of a file |
| 259 | and the first handle has writebehind data, we might be |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | able to simply do a filemap_fdatawrite/filemap_fdatawait first */ |
| 261 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); |
| 262 | if (!buf) { |
| 263 | rc = -ENOMEM; |
| 264 | goto out; |
| 265 | } |
Steve French | 5bafd76 | 2006-06-07 00:18:43 +0000 | [diff] [blame] | 266 | |
| 267 | if (cifs_sb->tcon->ses->capabilities & CAP_NT_SMBS) |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 268 | rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, |
Steve French | 5bafd76 | 2006-06-07 00:18:43 +0000 | [diff] [blame] | 269 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
Steve French | 737b758 | 2005-04-28 22:41:06 -0700 | [diff] [blame] | 270 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
| 271 | & CIFS_MOUNT_MAP_SPECIAL_CHR); |
Steve French | 5bafd76 | 2006-06-07 00:18:43 +0000 | [diff] [blame] | 272 | else |
| 273 | rc = -EIO; /* no NT SMB support fall into legacy open below */ |
| 274 | |
Steve French | a9d02ad | 2005-08-24 23:06:05 -0700 | [diff] [blame] | 275 | if (rc == -EIO) { |
| 276 | /* Old server, try legacy style OpenX */ |
| 277 | rc = SMBLegacyOpen(xid, pTcon, full_path, disposition, |
| 278 | desiredAccess, CREATE_NOT_DIR, &netfid, &oplock, buf, |
| 279 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags |
| 280 | & CIFS_MOUNT_MAP_SPECIAL_CHR); |
| 281 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | if (rc) { |
Steve French | 26a21b9 | 2006-05-31 18:05:34 +0000 | [diff] [blame] | 283 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | goto out; |
| 285 | } |
| 286 | file->private_data = |
| 287 | kmalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); |
| 288 | if (file->private_data == NULL) { |
| 289 | rc = -ENOMEM; |
| 290 | goto out; |
| 291 | } |
| 292 | pCifsFile = cifs_init_private(file->private_data, inode, file, netfid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | write_lock(&GlobalSMBSeslock); |
| 294 | list_add(&pCifsFile->tlist, &pTcon->openFileList); |
| 295 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 296 | pCifsInode = CIFS_I(file->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | if (pCifsInode) { |
| 298 | rc = cifs_open_inode_helper(inode, file, pCifsInode, |
| 299 | pCifsFile, pTcon, |
| 300 | &oplock, buf, full_path, xid); |
| 301 | } else { |
| 302 | write_unlock(&GlobalSMBSeslock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | } |
| 304 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 305 | if (oplock & CIFS_CREATE_ACTION) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | /* time to set mode which we can not set earlier due to |
| 307 | problems creating new read-only files */ |
Steve French | c18c842 | 2007-07-18 23:21:09 +0000 | [diff] [blame] | 308 | if (pTcon->unix_ext) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | CIFSSMBUnixSetPerms(xid, pTcon, full_path, |
| 310 | inode->i_mode, |
| 311 | (__u64)-1, (__u64)-1, 0 /* dev */, |
Steve French | 737b758 | 2005-04-28 22:41:06 -0700 | [diff] [blame] | 312 | cifs_sb->local_nls, |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 313 | cifs_sb->mnt_cifs_flags & |
Steve French | 737b758 | 2005-04-28 22:41:06 -0700 | [diff] [blame] | 314 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | } else { |
| 316 | /* BB implement via Windows security descriptors eg |
| 317 | CIFSSMBWinSetPerms(xid, pTcon, full_path, mode, |
| 318 | -1, -1, local_nls); |
| 319 | in the meantime could set r/o dos attribute when |
| 320 | perms are eg: mode & 0222 == 0 */ |
| 321 | } |
| 322 | } |
| 323 | |
| 324 | out: |
| 325 | kfree(buf); |
| 326 | kfree(full_path); |
| 327 | FreeXid(xid); |
| 328 | return rc; |
| 329 | } |
| 330 | |
Adrian Bunk | 0418726 | 2006-06-30 18:23:04 +0200 | [diff] [blame] | 331 | /* Try to reacquire byte range locks that were released when session */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | /* to server was lost */ |
| 333 | static int cifs_relock_file(struct cifsFileInfo *cifsFile) |
| 334 | { |
| 335 | int rc = 0; |
| 336 | |
| 337 | /* BB list all locks open on this file and relock */ |
| 338 | |
| 339 | return rc; |
| 340 | } |
| 341 | |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 342 | static int cifs_reopen_file(struct file *file, int can_flush) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | { |
| 344 | int rc = -EACCES; |
| 345 | int xid, oplock; |
| 346 | struct cifs_sb_info *cifs_sb; |
| 347 | struct cifsTconInfo *pTcon; |
| 348 | struct cifsFileInfo *pCifsFile; |
| 349 | struct cifsInodeInfo *pCifsInode; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 350 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | char *full_path = NULL; |
| 352 | int desiredAccess; |
| 353 | int disposition = FILE_OPEN; |
| 354 | __u16 netfid; |
| 355 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | if (file->private_data) { |
| 357 | pCifsFile = (struct cifsFileInfo *)file->private_data; |
| 358 | } else |
| 359 | return -EBADF; |
| 360 | |
| 361 | xid = GetXid(); |
| 362 | down(&pCifsFile->fh_sem); |
| 363 | if (pCifsFile->invalidHandle == FALSE) { |
| 364 | up(&pCifsFile->fh_sem); |
| 365 | FreeXid(xid); |
| 366 | return 0; |
| 367 | } |
| 368 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 369 | if (file->f_path.dentry == NULL) { |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 370 | cERROR(1, ("no valid name if dentry freed")); |
| 371 | dump_stack(); |
| 372 | rc = -EBADF; |
| 373 | goto reopen_error_exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | } |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 375 | |
| 376 | inode = file->f_path.dentry->d_inode; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 377 | if (inode == NULL) { |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 378 | cERROR(1, ("inode not valid")); |
| 379 | dump_stack(); |
| 380 | rc = -EBADF; |
| 381 | goto reopen_error_exit; |
| 382 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 383 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | cifs_sb = CIFS_SB(inode->i_sb); |
| 385 | pTcon = cifs_sb->tcon; |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 386 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | /* can not grab rename sem here because various ops, including |
| 388 | those that already have the rename sem can end up causing writepage |
| 389 | to get called and if the server was down that means we end up here, |
| 390 | 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] | 391 | full_path = build_path_from_dentry(file->f_path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | if (full_path == NULL) { |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 393 | rc = -ENOMEM; |
| 394 | reopen_error_exit: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | up(&pCifsFile->fh_sem); |
| 396 | FreeXid(xid); |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 397 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | } |
| 399 | |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 400 | cFYI(1, ("inode = 0x%p file flags 0x%x for %s", |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 401 | inode, file->f_flags, full_path)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | desiredAccess = cifs_convert_flags(file->f_flags); |
| 403 | |
| 404 | if (oplockEnabled) |
| 405 | oplock = REQ_OPLOCK; |
| 406 | else |
| 407 | oplock = FALSE; |
| 408 | |
| 409 | /* 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] | 410 | by SMBOpen and then calling get_inode_info with returned buf |
| 411 | since file might have write behind data that needs to be flushed |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | and server version of file size can be stale. If we knew for sure |
| 413 | that inode was not dirty locally we could do this */ |
| 414 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | rc = CIFSSMBOpen(xid, pTcon, full_path, disposition, desiredAccess, |
| 416 | CREATE_NOT_DIR, &netfid, &oplock, NULL, |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 417 | cifs_sb->local_nls, cifs_sb->mnt_cifs_flags & |
Steve French | 737b758 | 2005-04-28 22:41:06 -0700 | [diff] [blame] | 418 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | if (rc) { |
| 420 | up(&pCifsFile->fh_sem); |
Steve French | 26a21b9 | 2006-05-31 18:05:34 +0000 | [diff] [blame] | 421 | cFYI(1, ("cifs_open returned 0x%x", rc)); |
| 422 | cFYI(1, ("oplock: %d", oplock)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | } else { |
| 424 | pCifsFile->netfid = netfid; |
| 425 | pCifsFile->invalidHandle = FALSE; |
| 426 | up(&pCifsFile->fh_sem); |
| 427 | pCifsInode = CIFS_I(inode); |
| 428 | if (pCifsInode) { |
| 429 | if (can_flush) { |
Jeff Layton | cea2180 | 2007-11-20 23:19:03 +0000 | [diff] [blame] | 430 | rc = filemap_write_and_wait(inode->i_mapping); |
| 431 | if (rc != 0) |
| 432 | CIFS_I(inode)->write_behind_rc = rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | /* temporarily disable caching while we |
| 434 | go to server to get inode info */ |
| 435 | pCifsInode->clientCanCacheAll = FALSE; |
| 436 | pCifsInode->clientCanCacheRead = FALSE; |
Steve French | c18c842 | 2007-07-18 23:21:09 +0000 | [diff] [blame] | 437 | if (pTcon->unix_ext) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | rc = cifs_get_inode_info_unix(&inode, |
| 439 | full_path, inode->i_sb, xid); |
| 440 | else |
| 441 | rc = cifs_get_inode_info(&inode, |
| 442 | full_path, NULL, inode->i_sb, |
| 443 | xid); |
| 444 | } /* else we are writing out data to server already |
| 445 | and could deadlock if we tried to flush data, and |
| 446 | since we do not know if we have data that would |
| 447 | invalidate the current end of file on the server |
| 448 | we can not go to the server to get the new inod |
| 449 | info */ |
| 450 | if ((oplock & 0xF) == OPLOCK_EXCLUSIVE) { |
| 451 | pCifsInode->clientCanCacheAll = TRUE; |
| 452 | pCifsInode->clientCanCacheRead = TRUE; |
| 453 | cFYI(1, ("Exclusive Oplock granted on inode %p", |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 454 | file->f_path.dentry->d_inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | } else if ((oplock & 0xF) == OPLOCK_READ) { |
| 456 | pCifsInode->clientCanCacheRead = TRUE; |
| 457 | pCifsInode->clientCanCacheAll = FALSE; |
| 458 | } else { |
| 459 | pCifsInode->clientCanCacheRead = FALSE; |
| 460 | pCifsInode->clientCanCacheAll = FALSE; |
| 461 | } |
| 462 | cifs_relock_file(pCifsFile); |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | kfree(full_path); |
| 467 | FreeXid(xid); |
| 468 | return rc; |
| 469 | } |
| 470 | |
| 471 | int cifs_close(struct inode *inode, struct file *file) |
| 472 | { |
| 473 | int rc = 0; |
Steve French | 1574532 | 2007-09-07 22:23:48 +0000 | [diff] [blame] | 474 | int xid, timeout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | struct cifs_sb_info *cifs_sb; |
| 476 | struct cifsTconInfo *pTcon; |
| 477 | struct cifsFileInfo *pSMBFile = |
| 478 | (struct cifsFileInfo *)file->private_data; |
| 479 | |
| 480 | xid = GetXid(); |
| 481 | |
| 482 | cifs_sb = CIFS_SB(inode->i_sb); |
| 483 | pTcon = cifs_sb->tcon; |
| 484 | if (pSMBFile) { |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 485 | struct cifsLockInfo *li, *tmp; |
| 486 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | pSMBFile->closePend = TRUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | if (pTcon) { |
| 489 | /* no sense reconnecting to close a file that is |
| 490 | already closed */ |
| 491 | if (pTcon->tidStatus != CifsNeedReconnect) { |
Steve French | 1574532 | 2007-09-07 22:23:48 +0000 | [diff] [blame] | 492 | timeout = 2; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 493 | while ((atomic_read(&pSMBFile->wrtPending) != 0) |
Steve French | 1574532 | 2007-09-07 22:23:48 +0000 | [diff] [blame] | 494 | && (timeout <= 2048)) { |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 495 | /* Give write a better chance to get to |
| 496 | server ahead of the close. We do not |
| 497 | want to add a wait_q here as it would |
| 498 | increase the memory utilization as |
| 499 | the struct would be in each open file, |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 500 | but this should give enough time to |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 501 | clear the socket */ |
Steve French | 4891d53 | 2006-11-07 16:31:16 +0000 | [diff] [blame] | 502 | #ifdef CONFIG_CIFS_DEBUG2 |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 503 | cFYI(1, ("close delay, write pending")); |
Steve French | 4891d53 | 2006-11-07 16:31:16 +0000 | [diff] [blame] | 504 | #endif /* DEBUG2 */ |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 505 | msleep(timeout); |
| 506 | timeout *= 4; |
Steve French | 4891d53 | 2006-11-07 16:31:16 +0000 | [diff] [blame] | 507 | } |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 508 | if (atomic_read(&pSMBFile->wrtPending)) |
Steve French | 63135e0 | 2007-07-17 17:34:02 +0000 | [diff] [blame] | 509 | cERROR(1, |
| 510 | ("close with pending writes")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | rc = CIFSSMBClose(xid, pTcon, |
| 512 | pSMBFile->netfid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | } |
| 514 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 515 | |
| 516 | /* Delete any outstanding lock records. |
| 517 | We'll lose them when the file is closed anyway. */ |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 518 | mutex_lock(&pSMBFile->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 519 | list_for_each_entry_safe(li, tmp, &pSMBFile->llist, llist) { |
| 520 | list_del(&li->llist); |
| 521 | kfree(li); |
| 522 | } |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 523 | mutex_unlock(&pSMBFile->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 524 | |
Steve French | cbe0476 | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 525 | write_lock(&GlobalSMBSeslock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | list_del(&pSMBFile->flist); |
| 527 | list_del(&pSMBFile->tlist); |
Steve French | cbe0476 | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 528 | write_unlock(&GlobalSMBSeslock); |
Steve French | 1574532 | 2007-09-07 22:23:48 +0000 | [diff] [blame] | 529 | timeout = 10; |
| 530 | /* We waited above to give the SMBWrite a chance to issue |
| 531 | on the wire (so we do not get SMBWrite returning EBADF |
| 532 | if writepages is racing with close. Note that writepages |
| 533 | does not specify a file handle, so it is possible for a file |
| 534 | to be opened twice, and the application close the "wrong" |
| 535 | file handle - in these cases we delay long enough to allow |
| 536 | the SMBWrite to get on the wire before the SMB Close. |
| 537 | We allow total wait here over 45 seconds, more than |
| 538 | oplock break time, and more than enough to allow any write |
| 539 | to complete on the server, or to time out on the client */ |
| 540 | while ((atomic_read(&pSMBFile->wrtPending) != 0) |
| 541 | && (timeout <= 50000)) { |
| 542 | cERROR(1, ("writes pending, delay free of handle")); |
| 543 | msleep(timeout); |
| 544 | timeout *= 8; |
| 545 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | kfree(pSMBFile->search_resume_name); |
| 547 | kfree(file->private_data); |
| 548 | file->private_data = NULL; |
| 549 | } else |
| 550 | rc = -EBADF; |
| 551 | |
Steve French | 4efa53f | 2007-09-11 05:50:53 +0000 | [diff] [blame] | 552 | read_lock(&GlobalSMBSeslock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | if (list_empty(&(CIFS_I(inode)->openFileList))) { |
| 554 | cFYI(1, ("closing last open instance for inode %p", inode)); |
| 555 | /* if the file is not open we do not know if we can cache info |
| 556 | on this inode, much less write behind and read ahead */ |
| 557 | CIFS_I(inode)->clientCanCacheRead = FALSE; |
| 558 | CIFS_I(inode)->clientCanCacheAll = FALSE; |
| 559 | } |
Steve French | 4efa53f | 2007-09-11 05:50:53 +0000 | [diff] [blame] | 560 | read_unlock(&GlobalSMBSeslock); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 561 | if ((rc == 0) && CIFS_I(inode)->write_behind_rc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | rc = CIFS_I(inode)->write_behind_rc; |
| 563 | FreeXid(xid); |
| 564 | return rc; |
| 565 | } |
| 566 | |
| 567 | int cifs_closedir(struct inode *inode, struct file *file) |
| 568 | { |
| 569 | int rc = 0; |
| 570 | int xid; |
| 571 | struct cifsFileInfo *pCFileStruct = |
| 572 | (struct cifsFileInfo *)file->private_data; |
| 573 | char *ptmp; |
| 574 | |
Steve French | 26a21b9 | 2006-05-31 18:05:34 +0000 | [diff] [blame] | 575 | cFYI(1, ("Closedir inode = 0x%p", inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | |
| 577 | xid = GetXid(); |
| 578 | |
| 579 | if (pCFileStruct) { |
| 580 | struct cifsTconInfo *pTcon; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 581 | struct cifs_sb_info *cifs_sb = |
| 582 | CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
| 584 | pTcon = cifs_sb->tcon; |
| 585 | |
| 586 | cFYI(1, ("Freeing private data in close dir")); |
Steve French | 31ca3bc | 2005-04-28 22:41:11 -0700 | [diff] [blame] | 587 | if ((pCFileStruct->srch_inf.endOfSearch == FALSE) && |
| 588 | (pCFileStruct->invalidHandle == FALSE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | pCFileStruct->invalidHandle = TRUE; |
| 590 | rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid); |
| 591 | cFYI(1, ("Closing uncompleted readdir with rc %d", |
| 592 | rc)); |
| 593 | /* not much we can do if it fails anyway, ignore rc */ |
| 594 | rc = 0; |
| 595 | } |
| 596 | ptmp = pCFileStruct->srch_inf.ntwrk_buf_start; |
| 597 | if (ptmp) { |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 598 | cFYI(1, ("closedir free smb buf in srch struct")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | pCFileStruct->srch_inf.ntwrk_buf_start = NULL; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 600 | if (pCFileStruct->srch_inf.smallBuf) |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 601 | cifs_small_buf_release(ptmp); |
| 602 | else |
| 603 | cifs_buf_release(ptmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | } |
| 605 | ptmp = pCFileStruct->search_resume_name; |
| 606 | if (ptmp) { |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 607 | cFYI(1, ("closedir free resume name")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | pCFileStruct->search_resume_name = NULL; |
| 609 | kfree(ptmp); |
| 610 | } |
| 611 | kfree(file->private_data); |
| 612 | file->private_data = NULL; |
| 613 | } |
| 614 | /* BB can we lock the filestruct while this is going on? */ |
| 615 | FreeXid(xid); |
| 616 | return rc; |
| 617 | } |
| 618 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 619 | static int store_file_lock(struct cifsFileInfo *fid, __u64 len, |
| 620 | __u64 offset, __u8 lockType) |
| 621 | { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 622 | struct cifsLockInfo *li = |
| 623 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 624 | if (li == NULL) |
| 625 | return -ENOMEM; |
| 626 | li->offset = offset; |
| 627 | li->length = len; |
| 628 | li->type = lockType; |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 629 | mutex_lock(&fid->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 630 | list_add(&li->llist, &fid->llist); |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 631 | mutex_unlock(&fid->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 632 | return 0; |
| 633 | } |
| 634 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock) |
| 636 | { |
| 637 | int rc, xid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | __u32 numLock = 0; |
| 639 | __u32 numUnlock = 0; |
| 640 | __u64 length; |
| 641 | int wait_flag = FALSE; |
| 642 | struct cifs_sb_info *cifs_sb; |
| 643 | struct cifsTconInfo *pTcon; |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 644 | __u16 netfid; |
| 645 | __u8 lockType = LOCKING_ANDX_LARGE_FILES; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 646 | int posix_locking; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | |
| 648 | length = 1 + pfLock->fl_end - pfLock->fl_start; |
| 649 | rc = -EACCES; |
| 650 | xid = GetXid(); |
| 651 | |
| 652 | cFYI(1, ("Lock parm: 0x%x flockflags: " |
| 653 | "0x%x flocktype: 0x%x start: %lld end: %lld", |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 654 | cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start, |
| 655 | pfLock->fl_end)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
| 657 | if (pfLock->fl_flags & FL_POSIX) |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 658 | cFYI(1, ("Posix")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | if (pfLock->fl_flags & FL_FLOCK) |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 660 | cFYI(1, ("Flock")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | if (pfLock->fl_flags & FL_SLEEP) { |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 662 | cFYI(1, ("Blocking lock")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | wait_flag = TRUE; |
| 664 | } |
| 665 | if (pfLock->fl_flags & FL_ACCESS) |
| 666 | cFYI(1, ("Process suspended by mandatory locking - " |
Steve French | 26a21b9 | 2006-05-31 18:05:34 +0000 | [diff] [blame] | 667 | "not implemented yet")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | if (pfLock->fl_flags & FL_LEASE) |
| 669 | cFYI(1, ("Lease on file - not implemented yet")); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 670 | if (pfLock->fl_flags & |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE))) |
| 672 | cFYI(1, ("Unknown lock flags 0x%x", pfLock->fl_flags)); |
| 673 | |
| 674 | if (pfLock->fl_type == F_WRLCK) { |
| 675 | cFYI(1, ("F_WRLCK ")); |
| 676 | numLock = 1; |
| 677 | } else if (pfLock->fl_type == F_UNLCK) { |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 678 | cFYI(1, ("F_UNLCK")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | numUnlock = 1; |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 680 | /* Check if unlock includes more than |
| 681 | one lock range */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | } else if (pfLock->fl_type == F_RDLCK) { |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 683 | cFYI(1, ("F_RDLCK")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
| 685 | numLock = 1; |
| 686 | } else if (pfLock->fl_type == F_EXLCK) { |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 687 | cFYI(1, ("F_EXLCK")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | numLock = 1; |
| 689 | } else if (pfLock->fl_type == F_SHLCK) { |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 690 | cFYI(1, ("F_SHLCK")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | lockType |= LOCKING_ANDX_SHARED_LOCK; |
| 692 | numLock = 1; |
| 693 | } else |
Steve French | d47d7c1 | 2006-02-28 03:45:48 +0000 | [diff] [blame] | 694 | cFYI(1, ("Unknown type of lock")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 696 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | pTcon = cifs_sb->tcon; |
| 698 | |
| 699 | if (file->private_data == NULL) { |
| 700 | FreeXid(xid); |
| 701 | return -EBADF; |
| 702 | } |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 703 | netfid = ((struct cifsFileInfo *)file->private_data)->netfid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 705 | posix_locking = (cifs_sb->tcon->ses->capabilities & CAP_UNIX) && |
| 706 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(cifs_sb->tcon->fsUnixInfo.Capability)); |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 707 | |
| 708 | /* BB add code here to normalize offset and length to |
| 709 | account for negative length which we can not accept over the |
| 710 | wire */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | if (IS_GETLK(cmd)) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 712 | if (posix_locking) { |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 713 | int posix_lock_type; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 714 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 715 | posix_lock_type = CIFS_RDLCK; |
| 716 | else |
| 717 | posix_lock_type = CIFS_WRLCK; |
| 718 | rc = CIFSSMBPosixLock(xid, pTcon, netfid, 1 /* get */, |
Steve French | fc94cdb | 2006-05-30 18:03:32 +0000 | [diff] [blame] | 719 | length, pfLock, |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 720 | posix_lock_type, wait_flag); |
| 721 | FreeXid(xid); |
| 722 | return rc; |
| 723 | } |
| 724 | |
| 725 | /* BB we could chain these into one lock request BB */ |
| 726 | rc = CIFSSMBLock(xid, pTcon, netfid, length, pfLock->fl_start, |
| 727 | 0, 1, lockType, 0 /* wait flag */ ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | if (rc == 0) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 729 | rc = CIFSSMBLock(xid, pTcon, netfid, length, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | pfLock->fl_start, 1 /* numUnlock */ , |
| 731 | 0 /* numLock */ , lockType, |
| 732 | 0 /* wait flag */ ); |
| 733 | pfLock->fl_type = F_UNLCK; |
| 734 | if (rc != 0) |
| 735 | cERROR(1, ("Error unlocking previously locked " |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 736 | "range %d during test of lock", rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | rc = 0; |
| 738 | |
| 739 | } else { |
| 740 | /* if rc == ERR_SHARING_VIOLATION ? */ |
| 741 | rc = 0; /* do not change lock type to unlock |
| 742 | since range in use */ |
| 743 | } |
| 744 | |
| 745 | FreeXid(xid); |
| 746 | return rc; |
| 747 | } |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 748 | |
| 749 | if (!numLock && !numUnlock) { |
| 750 | /* if no lock or unlock then nothing |
| 751 | to do since we do not know what it is */ |
| 752 | FreeXid(xid); |
| 753 | return -EOPNOTSUPP; |
| 754 | } |
| 755 | |
| 756 | if (posix_locking) { |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 757 | int posix_lock_type; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 758 | if (lockType & LOCKING_ANDX_SHARED_LOCK) |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 759 | posix_lock_type = CIFS_RDLCK; |
| 760 | else |
| 761 | posix_lock_type = CIFS_WRLCK; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 762 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 763 | if (numUnlock == 1) |
Steve French | beb84dc | 2006-03-03 23:36:34 +0000 | [diff] [blame] | 764 | posix_lock_type = CIFS_UNLCK; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 765 | |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 766 | rc = CIFSSMBPosixLock(xid, pTcon, netfid, 0 /* set */, |
Steve French | fc94cdb | 2006-05-30 18:03:32 +0000 | [diff] [blame] | 767 | length, pfLock, |
Steve French | 08547b0 | 2006-02-28 22:39:25 +0000 | [diff] [blame] | 768 | posix_lock_type, wait_flag); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 769 | } else { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 770 | struct cifsFileInfo *fid = |
| 771 | (struct cifsFileInfo *)file->private_data; |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 772 | |
| 773 | if (numLock) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 774 | rc = CIFSSMBLock(xid, pTcon, netfid, length, |
| 775 | pfLock->fl_start, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 776 | 0, numLock, lockType, wait_flag); |
| 777 | |
| 778 | if (rc == 0) { |
| 779 | /* For Windows locks we must store them. */ |
| 780 | rc = store_file_lock(fid, length, |
| 781 | pfLock->fl_start, lockType); |
| 782 | } |
| 783 | } else if (numUnlock) { |
| 784 | /* For each stored lock that this unlock overlaps |
| 785 | completely, unlock it. */ |
| 786 | int stored_rc = 0; |
| 787 | struct cifsLockInfo *li, *tmp; |
| 788 | |
Steve French | 6b70c95 | 2006-09-21 07:35:29 +0000 | [diff] [blame] | 789 | rc = 0; |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 790 | mutex_lock(&fid->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 791 | list_for_each_entry_safe(li, tmp, &fid->llist, llist) { |
| 792 | if (pfLock->fl_start <= li->offset && |
Steve French | c19eb71 | 2007-08-24 03:22:48 +0000 | [diff] [blame] | 793 | (pfLock->fl_start + length) >= |
Jeff Layton | 39db810 | 2007-08-24 03:16:51 +0000 | [diff] [blame] | 794 | (li->offset + li->length)) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 795 | stored_rc = CIFSSMBLock(xid, pTcon, |
| 796 | netfid, |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 797 | li->length, li->offset, |
| 798 | 1, 0, li->type, FALSE); |
| 799 | if (stored_rc) |
| 800 | rc = stored_rc; |
| 801 | |
| 802 | list_del(&li->llist); |
| 803 | kfree(li); |
| 804 | } |
| 805 | } |
Roland Dreier | 796e566 | 2007-05-03 04:33:45 +0000 | [diff] [blame] | 806 | mutex_unlock(&fid->lock_mutex); |
Jeremy Allison | 7ee1af7 | 2006-08-02 21:56:33 +0000 | [diff] [blame] | 807 | } |
| 808 | } |
| 809 | |
Steve French | d634cc1 | 2005-08-26 14:42:59 -0500 | [diff] [blame] | 810 | if (pfLock->fl_flags & FL_POSIX) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | posix_lock_file_wait(file, pfLock); |
| 812 | FreeXid(xid); |
| 813 | return rc; |
| 814 | } |
| 815 | |
| 816 | ssize_t cifs_user_write(struct file *file, const char __user *write_data, |
| 817 | size_t write_size, loff_t *poffset) |
| 818 | { |
| 819 | int rc = 0; |
| 820 | unsigned int bytes_written = 0; |
| 821 | unsigned int total_written; |
| 822 | struct cifs_sb_info *cifs_sb; |
| 823 | struct cifsTconInfo *pTcon; |
| 824 | int xid, long_op; |
| 825 | struct cifsFileInfo *open_file; |
| 826 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 827 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | |
| 829 | pTcon = cifs_sb->tcon; |
| 830 | |
| 831 | /* cFYI(1, |
| 832 | (" write %d bytes to offset %lld of %s", write_size, |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 833 | *poffset, file->f_path.dentry->d_name.name)); */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | |
| 835 | if (file->private_data == NULL) |
| 836 | return -EBADF; |
Christoph Hellwig | c33f8d3 | 2007-04-02 18:47:20 +0000 | [diff] [blame] | 837 | open_file = (struct cifsFileInfo *) file->private_data; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 838 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | xid = GetXid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 841 | if (*poffset > file->f_path.dentry->d_inode->i_size) |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 842 | long_op = CIFS_VLONG_OP; /* writes past EOF take long time */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | else |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 844 | long_op = CIFS_LONG_OP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | |
| 846 | for (total_written = 0; write_size > total_written; |
| 847 | total_written += bytes_written) { |
| 848 | rc = -EAGAIN; |
| 849 | while (rc == -EAGAIN) { |
| 850 | if (file->private_data == NULL) { |
| 851 | /* file has been closed on us */ |
| 852 | FreeXid(xid); |
| 853 | /* if we have gotten here we have written some data |
| 854 | and blocked, and the file has been freed on us while |
| 855 | we blocked so return what we managed to write */ |
| 856 | return total_written; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 857 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | if (open_file->closePend) { |
| 859 | FreeXid(xid); |
| 860 | if (total_written) |
| 861 | return total_written; |
| 862 | else |
| 863 | return -EBADF; |
| 864 | } |
| 865 | if (open_file->invalidHandle) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | /* we could deadlock if we called |
| 867 | filemap_fdatawait from here so tell |
| 868 | reopen_file not to flush data to server |
| 869 | now */ |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 870 | rc = cifs_reopen_file(file, FALSE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | if (rc != 0) |
| 872 | break; |
| 873 | } |
| 874 | |
| 875 | rc = CIFSSMBWrite(xid, pTcon, |
| 876 | open_file->netfid, |
| 877 | min_t(const int, cifs_sb->wsize, |
| 878 | write_size - total_written), |
| 879 | *poffset, &bytes_written, |
| 880 | NULL, write_data + total_written, long_op); |
| 881 | } |
| 882 | if (rc || (bytes_written == 0)) { |
| 883 | if (total_written) |
| 884 | break; |
| 885 | else { |
| 886 | FreeXid(xid); |
| 887 | return rc; |
| 888 | } |
| 889 | } else |
| 890 | *poffset += bytes_written; |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 891 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | 15 seconds is plenty */ |
| 893 | } |
| 894 | |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 895 | cifs_stats_bytes_written(pTcon, total_written); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | |
| 897 | /* since the write may have blocked check these pointers again */ |
Steve French | 3677db1 | 2007-02-26 16:46:11 +0000 | [diff] [blame] | 898 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
| 899 | struct inode *inode = file->f_path.dentry->d_inode; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 900 | /* Do not update local mtime - server will set its actual value on write |
| 901 | * inode->i_ctime = inode->i_mtime = |
Steve French | 3677db1 | 2007-02-26 16:46:11 +0000 | [diff] [blame] | 902 | * current_fs_time(inode->i_sb);*/ |
| 903 | if (total_written > 0) { |
| 904 | spin_lock(&inode->i_lock); |
| 905 | if (*poffset > file->f_path.dentry->d_inode->i_size) |
| 906 | i_size_write(file->f_path.dentry->d_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | *poffset); |
Steve French | 3677db1 | 2007-02-26 16:46:11 +0000 | [diff] [blame] | 908 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | } |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 910 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | } |
| 912 | FreeXid(xid); |
| 913 | return total_written; |
| 914 | } |
| 915 | |
| 916 | static ssize_t cifs_write(struct file *file, const char *write_data, |
| 917 | size_t write_size, loff_t *poffset) |
| 918 | { |
| 919 | int rc = 0; |
| 920 | unsigned int bytes_written = 0; |
| 921 | unsigned int total_written; |
| 922 | struct cifs_sb_info *cifs_sb; |
| 923 | struct cifsTconInfo *pTcon; |
| 924 | int xid, long_op; |
| 925 | struct cifsFileInfo *open_file; |
| 926 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 927 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | |
| 929 | pTcon = cifs_sb->tcon; |
| 930 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 931 | 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] | 932 | *poffset, file->f_path.dentry->d_name.name)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | |
| 934 | if (file->private_data == NULL) |
| 935 | return -EBADF; |
Christoph Hellwig | c33f8d3 | 2007-04-02 18:47:20 +0000 | [diff] [blame] | 936 | open_file = (struct cifsFileInfo *)file->private_data; |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 937 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | xid = GetXid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 940 | if (*poffset > file->f_path.dentry->d_inode->i_size) |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 941 | long_op = CIFS_VLONG_OP; /* writes past EOF can be slow */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | else |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 943 | long_op = CIFS_LONG_OP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | |
| 945 | for (total_written = 0; write_size > total_written; |
| 946 | total_written += bytes_written) { |
| 947 | rc = -EAGAIN; |
| 948 | while (rc == -EAGAIN) { |
| 949 | if (file->private_data == NULL) { |
| 950 | /* file has been closed on us */ |
| 951 | FreeXid(xid); |
| 952 | /* if we have gotten here we have written some data |
| 953 | and blocked, and the file has been freed on us |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 954 | while we blocked so return what we managed to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | write */ |
| 956 | return total_written; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 957 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | if (open_file->closePend) { |
| 959 | FreeXid(xid); |
| 960 | if (total_written) |
| 961 | return total_written; |
| 962 | else |
| 963 | return -EBADF; |
| 964 | } |
| 965 | if (open_file->invalidHandle) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | /* we could deadlock if we called |
| 967 | filemap_fdatawait from here so tell |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 968 | reopen_file not to flush data to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | server now */ |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 970 | rc = cifs_reopen_file(file, FALSE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | if (rc != 0) |
| 972 | break; |
| 973 | } |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 974 | if (experimEnabled || (pTcon->ses->server && |
| 975 | ((pTcon->ses->server->secMode & |
Steve French | 0877583 | 2006-05-30 18:08:26 +0000 | [diff] [blame] | 976 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
Steve French | c01f36a | 2006-05-30 18:05:10 +0000 | [diff] [blame] | 977 | == 0))) { |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 978 | struct kvec iov[2]; |
| 979 | unsigned int len; |
| 980 | |
Steve French | 0ae0efa | 2005-10-10 10:57:19 -0700 | [diff] [blame] | 981 | len = min((size_t)cifs_sb->wsize, |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 982 | write_size - total_written); |
| 983 | /* iov[0] is reserved for smb header */ |
| 984 | iov[1].iov_base = (char *)write_data + |
| 985 | total_written; |
| 986 | iov[1].iov_len = len; |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 987 | rc = CIFSSMBWrite2(xid, pTcon, |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 988 | open_file->netfid, len, |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 989 | *poffset, &bytes_written, |
Steve French | 3e84469 | 2005-10-03 13:37:24 -0700 | [diff] [blame] | 990 | iov, 1, long_op); |
Steve French | d6e04ae | 2005-06-13 13:24:43 -0500 | [diff] [blame] | 991 | } else |
Steve French | 6080823 | 2006-04-22 15:53:05 +0000 | [diff] [blame] | 992 | rc = CIFSSMBWrite(xid, pTcon, |
| 993 | open_file->netfid, |
| 994 | min_t(const int, cifs_sb->wsize, |
| 995 | write_size - total_written), |
| 996 | *poffset, &bytes_written, |
| 997 | write_data + total_written, |
| 998 | NULL, long_op); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | } |
| 1000 | if (rc || (bytes_written == 0)) { |
| 1001 | if (total_written) |
| 1002 | break; |
| 1003 | else { |
| 1004 | FreeXid(xid); |
| 1005 | return rc; |
| 1006 | } |
| 1007 | } else |
| 1008 | *poffset += bytes_written; |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 1009 | long_op = CIFS_STD_OP; /* subsequent writes fast - |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | 15 seconds is plenty */ |
| 1011 | } |
| 1012 | |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 1013 | cifs_stats_bytes_written(pTcon, total_written); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
| 1015 | /* since the write may have blocked check these pointers again */ |
Steve French | 3677db1 | 2007-02-26 16:46:11 +0000 | [diff] [blame] | 1016 | if ((file->f_path.dentry) && (file->f_path.dentry->d_inode)) { |
Steve French | 004c46b | 2007-02-17 04:34:13 +0000 | [diff] [blame] | 1017 | /*BB We could make this contingent on superblock ATIME flag too */ |
Steve French | 3677db1 | 2007-02-26 16:46:11 +0000 | [diff] [blame] | 1018 | /* file->f_path.dentry->d_inode->i_ctime = |
| 1019 | file->f_path.dentry->d_inode->i_mtime = CURRENT_TIME;*/ |
| 1020 | if (total_written > 0) { |
| 1021 | spin_lock(&file->f_path.dentry->d_inode->i_lock); |
| 1022 | if (*poffset > file->f_path.dentry->d_inode->i_size) |
| 1023 | i_size_write(file->f_path.dentry->d_inode, |
| 1024 | *poffset); |
| 1025 | spin_unlock(&file->f_path.dentry->d_inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | } |
Steve French | 3677db1 | 2007-02-26 16:46:11 +0000 | [diff] [blame] | 1027 | mark_inode_dirty_sync(file->f_path.dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | } |
| 1029 | FreeXid(xid); |
| 1030 | return total_written; |
| 1031 | } |
| 1032 | |
Steve French | 630f3f0c | 2007-10-25 21:17:17 +0000 | [diff] [blame] | 1033 | #ifdef CONFIG_CIFS_EXPERIMENTAL |
| 1034 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) |
| 1035 | { |
| 1036 | struct cifsFileInfo *open_file = NULL; |
| 1037 | |
| 1038 | read_lock(&GlobalSMBSeslock); |
| 1039 | /* we could simply get the first_list_entry since write-only entries |
| 1040 | are always at the end of the list but since the first entry might |
| 1041 | have a close pending, we go through the whole list */ |
| 1042 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
| 1043 | if (open_file->closePend) |
| 1044 | continue; |
| 1045 | if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || |
| 1046 | (open_file->pfile->f_flags & O_RDONLY))) { |
| 1047 | if (!open_file->invalidHandle) { |
| 1048 | /* found a good file */ |
| 1049 | /* lock it so it will not be closed on us */ |
| 1050 | atomic_inc(&open_file->wrtPending); |
| 1051 | read_unlock(&GlobalSMBSeslock); |
| 1052 | return open_file; |
| 1053 | } /* else might as well continue, and look for |
| 1054 | another, or simply have the caller reopen it |
| 1055 | again rather than trying to fix this handle */ |
| 1056 | } else /* write only file */ |
| 1057 | break; /* write only files are last so must be done */ |
| 1058 | } |
| 1059 | read_unlock(&GlobalSMBSeslock); |
| 1060 | return NULL; |
| 1061 | } |
| 1062 | #endif |
| 1063 | |
Steve French | dd99cd8 | 2005-10-05 19:32:49 -0700 | [diff] [blame] | 1064 | struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1065 | { |
| 1066 | struct cifsFileInfo *open_file; |
Steve French | dd99cd8 | 2005-10-05 19:32:49 -0700 | [diff] [blame] | 1067 | int rc; |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1068 | |
Steve French | 6080823 | 2006-04-22 15:53:05 +0000 | [diff] [blame] | 1069 | /* Having a null inode here (because mapping->host was set to zero by |
| 1070 | the VFS or MM) should not happen but we had reports of on oops (due to |
| 1071 | it being zero) during stress testcases so we need to check for it */ |
| 1072 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1073 | if (cifs_inode == NULL) { |
| 1074 | cERROR(1, ("Null inode passed to cifs_writeable_file")); |
Steve French | 6080823 | 2006-04-22 15:53:05 +0000 | [diff] [blame] | 1075 | dump_stack(); |
| 1076 | return NULL; |
| 1077 | } |
| 1078 | |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1079 | read_lock(&GlobalSMBSeslock); |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1080 | refind_writable: |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1081 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
| 1082 | if (open_file->closePend) |
| 1083 | continue; |
| 1084 | if (open_file->pfile && |
| 1085 | ((open_file->pfile->f_flags & O_RDWR) || |
| 1086 | (open_file->pfile->f_flags & O_WRONLY))) { |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1087 | atomic_inc(&open_file->wrtPending); |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1088 | |
| 1089 | if (!open_file->invalidHandle) { |
| 1090 | /* found a good writable file */ |
| 1091 | read_unlock(&GlobalSMBSeslock); |
| 1092 | return open_file; |
| 1093 | } |
Steve French | 8840dee | 2007-11-16 23:05:52 +0000 | [diff] [blame] | 1094 | |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1095 | read_unlock(&GlobalSMBSeslock); |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1096 | /* Had to unlock since following call can block */ |
| 1097 | rc = cifs_reopen_file(open_file->pfile, FALSE); |
Steve French | 8840dee | 2007-11-16 23:05:52 +0000 | [diff] [blame] | 1098 | if (!rc) { |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1099 | if (!open_file->closePend) |
| 1100 | return open_file; |
| 1101 | else { /* start over in case this was deleted */ |
| 1102 | /* since the list could be modified */ |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1103 | read_lock(&GlobalSMBSeslock); |
Steve French | 1574532 | 2007-09-07 22:23:48 +0000 | [diff] [blame] | 1104 | atomic_dec(&open_file->wrtPending); |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1105 | goto refind_writable; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1106 | } |
| 1107 | } |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1108 | |
| 1109 | /* if it fails, try another handle if possible - |
| 1110 | (we can not do this if closePending since |
| 1111 | loop could be modified - in which case we |
| 1112 | have to start at the beginning of the list |
| 1113 | again. Note that it would be bad |
| 1114 | to hold up writepages here (rather than |
| 1115 | in caller) with continuous retries */ |
| 1116 | cFYI(1, ("wp failed on reopen file")); |
| 1117 | read_lock(&GlobalSMBSeslock); |
| 1118 | /* can not use this handle, no write |
| 1119 | pending on this one after all */ |
| 1120 | atomic_dec(&open_file->wrtPending); |
Steve French | 8840dee | 2007-11-16 23:05:52 +0000 | [diff] [blame] | 1121 | |
Steve French | 9b22b0b | 2007-10-02 01:11:08 +0000 | [diff] [blame] | 1122 | if (open_file->closePend) /* list could have changed */ |
| 1123 | goto refind_writable; |
| 1124 | /* else we simply continue to the next entry. Thus |
| 1125 | we do not loop on reopen errors. If we |
| 1126 | can not reopen the file, for example if we |
| 1127 | reconnected to a server with another client |
| 1128 | racing to delete or lock the file we would not |
| 1129 | make progress if we restarted before the beginning |
| 1130 | of the loop here. */ |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1131 | } |
| 1132 | } |
| 1133 | read_unlock(&GlobalSMBSeslock); |
| 1134 | return NULL; |
| 1135 | } |
| 1136 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
| 1138 | { |
| 1139 | struct address_space *mapping = page->mapping; |
| 1140 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 1141 | char *write_data; |
| 1142 | int rc = -EFAULT; |
| 1143 | int bytes_written = 0; |
| 1144 | struct cifs_sb_info *cifs_sb; |
| 1145 | struct cifsTconInfo *pTcon; |
| 1146 | struct inode *inode; |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1147 | struct cifsFileInfo *open_file; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | |
| 1149 | if (!mapping || !mapping->host) |
| 1150 | return -EFAULT; |
| 1151 | |
| 1152 | inode = page->mapping->host; |
| 1153 | cifs_sb = CIFS_SB(inode->i_sb); |
| 1154 | pTcon = cifs_sb->tcon; |
| 1155 | |
| 1156 | offset += (loff_t)from; |
| 1157 | write_data = kmap(page); |
| 1158 | write_data += from; |
| 1159 | |
| 1160 | if ((to > PAGE_CACHE_SIZE) || (from > to)) { |
| 1161 | kunmap(page); |
| 1162 | return -EIO; |
| 1163 | } |
| 1164 | |
| 1165 | /* racing with truncate? */ |
| 1166 | if (offset > mapping->host->i_size) { |
| 1167 | kunmap(page); |
| 1168 | return 0; /* don't care */ |
| 1169 | } |
| 1170 | |
| 1171 | /* check to make sure that we are not extending the file */ |
| 1172 | if (mapping->host->i_size - offset < (loff_t)to) |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1173 | to = (unsigned)(mapping->host->i_size - offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1175 | open_file = find_writable_file(CIFS_I(mapping->host)); |
| 1176 | if (open_file) { |
| 1177 | bytes_written = cifs_write(open_file->pfile, write_data, |
| 1178 | to-from, &offset); |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1179 | atomic_dec(&open_file->wrtPending); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | /* Does mm or vfs already set times? */ |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1181 | inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb); |
Steve French | bb5a9a0 | 2007-12-31 04:21:29 +0000 | [diff] [blame] | 1182 | if ((bytes_written > 0) && (offset)) |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1183 | rc = 0; |
Steve French | bb5a9a0 | 2007-12-31 04:21:29 +0000 | [diff] [blame] | 1184 | else if (bytes_written < 0) |
| 1185 | rc = bytes_written; |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 1186 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | cFYI(1, ("No writeable filehandles for inode")); |
| 1188 | rc = -EIO; |
| 1189 | } |
| 1190 | |
| 1191 | kunmap(page); |
| 1192 | return rc; |
| 1193 | } |
| 1194 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | static int cifs_writepages(struct address_space *mapping, |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1196 | struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1198 | struct backing_dev_info *bdi = mapping->backing_dev_info; |
| 1199 | unsigned int bytes_to_write; |
| 1200 | unsigned int bytes_written; |
| 1201 | struct cifs_sb_info *cifs_sb; |
| 1202 | int done = 0; |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1203 | pgoff_t end; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1204 | pgoff_t index; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1205 | int range_whole = 0; |
| 1206 | struct kvec *iov; |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1207 | int len; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1208 | int n_iov = 0; |
| 1209 | pgoff_t next; |
| 1210 | int nr_pages; |
| 1211 | __u64 offset = 0; |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1212 | struct cifsFileInfo *open_file; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1213 | struct page *page; |
| 1214 | struct pagevec pvec; |
| 1215 | int rc = 0; |
| 1216 | int scanned = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | int xid; |
| 1218 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1219 | cifs_sb = CIFS_SB(mapping->host->i_sb); |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1220 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1221 | /* |
| 1222 | * If wsize is smaller that the page cache size, default to writing |
| 1223 | * one page at a time via cifs_writepage |
| 1224 | */ |
| 1225 | if (cifs_sb->wsize < PAGE_CACHE_SIZE) |
| 1226 | return generic_writepages(mapping, wbc); |
| 1227 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1228 | if ((cifs_sb->tcon->ses) && (cifs_sb->tcon->ses->server)) |
| 1229 | if (cifs_sb->tcon->ses->server->secMode & |
| 1230 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
| 1231 | if (!experimEnabled) |
Steve French | 6080823 | 2006-04-22 15:53:05 +0000 | [diff] [blame] | 1232 | return generic_writepages(mapping, wbc); |
Steve French | 4a77118 | 2005-10-05 15:14:33 -0700 | [diff] [blame] | 1233 | |
Steve French | 9a0c823 | 2007-02-02 04:21:57 +0000 | [diff] [blame] | 1234 | iov = kmalloc(32 * sizeof(struct kvec), GFP_KERNEL); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1235 | if (iov == NULL) |
Steve French | 9a0c823 | 2007-02-02 04:21:57 +0000 | [diff] [blame] | 1236 | return generic_writepages(mapping, wbc); |
| 1237 | |
| 1238 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1239 | /* |
| 1240 | * BB: Is this meaningful for a non-block-device file system? |
| 1241 | * If it is, we should test it again after we do I/O |
| 1242 | */ |
| 1243 | if (wbc->nonblocking && bdi_write_congested(bdi)) { |
| 1244 | wbc->encountered_congestion = 1; |
Steve French | 9a0c823 | 2007-02-02 04:21:57 +0000 | [diff] [blame] | 1245 | kfree(iov); |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1246 | return 0; |
| 1247 | } |
| 1248 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | xid = GetXid(); |
| 1250 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1251 | pagevec_init(&pvec, 0); |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1252 | if (wbc->range_cyclic) { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1253 | index = mapping->writeback_index; /* Start from prev offset */ |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1254 | end = -1; |
| 1255 | } else { |
| 1256 | index = wbc->range_start >> PAGE_CACHE_SHIFT; |
| 1257 | end = wbc->range_end >> PAGE_CACHE_SHIFT; |
| 1258 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
| 1259 | range_whole = 1; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1260 | scanned = 1; |
| 1261 | } |
| 1262 | retry: |
| 1263 | while (!done && (index <= end) && |
| 1264 | (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, |
| 1265 | PAGECACHE_TAG_DIRTY, |
| 1266 | min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1))) { |
| 1267 | int first; |
| 1268 | unsigned int i; |
| 1269 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1270 | first = -1; |
| 1271 | next = 0; |
| 1272 | n_iov = 0; |
| 1273 | bytes_to_write = 0; |
| 1274 | |
| 1275 | for (i = 0; i < nr_pages; i++) { |
| 1276 | page = pvec.pages[i]; |
| 1277 | /* |
| 1278 | * At this point we hold neither mapping->tree_lock nor |
| 1279 | * lock on the page itself: the page may be truncated or |
| 1280 | * invalidated (changing page->mapping to NULL), or even |
| 1281 | * swizzled back from swapper_space to tmpfs file |
| 1282 | * mapping |
| 1283 | */ |
| 1284 | |
| 1285 | if (first < 0) |
| 1286 | lock_page(page); |
| 1287 | else if (TestSetPageLocked(page)) |
| 1288 | break; |
| 1289 | |
| 1290 | if (unlikely(page->mapping != mapping)) { |
| 1291 | unlock_page(page); |
| 1292 | break; |
| 1293 | } |
| 1294 | |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1295 | if (!wbc->range_cyclic && page->index > end) { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1296 | done = 1; |
| 1297 | unlock_page(page); |
| 1298 | break; |
| 1299 | } |
| 1300 | |
| 1301 | if (next && (page->index != next)) { |
| 1302 | /* Not next consecutive page */ |
| 1303 | unlock_page(page); |
| 1304 | break; |
| 1305 | } |
| 1306 | |
| 1307 | if (wbc->sync_mode != WB_SYNC_NONE) |
| 1308 | wait_on_page_writeback(page); |
| 1309 | |
| 1310 | if (PageWriteback(page) || |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1311 | !clear_page_dirty_for_io(page)) { |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1312 | unlock_page(page); |
| 1313 | break; |
| 1314 | } |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1315 | |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1316 | /* |
| 1317 | * This actually clears the dirty bit in the radix tree. |
| 1318 | * See cifs_writepage() for more commentary. |
| 1319 | */ |
| 1320 | set_page_writeback(page); |
| 1321 | |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1322 | if (page_offset(page) >= mapping->host->i_size) { |
| 1323 | done = 1; |
| 1324 | unlock_page(page); |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1325 | end_page_writeback(page); |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1326 | break; |
| 1327 | } |
| 1328 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1329 | /* |
| 1330 | * BB can we get rid of this? pages are held by pvec |
| 1331 | */ |
| 1332 | page_cache_get(page); |
| 1333 | |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1334 | len = min(mapping->host->i_size - page_offset(page), |
| 1335 | (loff_t)PAGE_CACHE_SIZE); |
| 1336 | |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1337 | /* reserve iov[0] for the smb header */ |
| 1338 | n_iov++; |
| 1339 | iov[n_iov].iov_base = kmap(page); |
Steve French | 84d2f07 | 2005-10-12 15:32:05 -0700 | [diff] [blame] | 1340 | iov[n_iov].iov_len = len; |
| 1341 | bytes_to_write += len; |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1342 | |
| 1343 | if (first < 0) { |
| 1344 | first = i; |
| 1345 | offset = page_offset(page); |
| 1346 | } |
| 1347 | next = page->index + 1; |
| 1348 | if (bytes_to_write + PAGE_CACHE_SIZE > cifs_sb->wsize) |
| 1349 | break; |
| 1350 | } |
| 1351 | if (n_iov) { |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1352 | /* Search for a writable handle every time we call |
| 1353 | * CIFSSMBWrite2. We can't rely on the last handle |
| 1354 | * we used to still be valid |
| 1355 | */ |
| 1356 | open_file = find_writable_file(CIFS_I(mapping->host)); |
| 1357 | if (!open_file) { |
| 1358 | cERROR(1, ("No writable handles for inode")); |
| 1359 | rc = -EBADF; |
Steve French | 1047abc | 2005-10-11 19:58:06 -0700 | [diff] [blame] | 1360 | } else { |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1361 | rc = CIFSSMBWrite2(xid, cifs_sb->tcon, |
| 1362 | open_file->netfid, |
| 1363 | bytes_to_write, offset, |
| 1364 | &bytes_written, iov, n_iov, |
Steve French | 133672e | 2007-11-13 22:41:37 +0000 | [diff] [blame] | 1365 | CIFS_LONG_OP); |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1366 | atomic_dec(&open_file->wrtPending); |
| 1367 | if (rc || bytes_written < bytes_to_write) { |
Steve French | 63135e0 | 2007-07-17 17:34:02 +0000 | [diff] [blame] | 1368 | cERROR(1, ("Write2 ret %d, wrote %d", |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1369 | rc, bytes_written)); |
| 1370 | /* BB what if continued retry is |
| 1371 | requested via mount flags? */ |
Jeff Layton | cea2180 | 2007-11-20 23:19:03 +0000 | [diff] [blame] | 1372 | if (rc == -ENOSPC) |
| 1373 | set_bit(AS_ENOSPC, &mapping->flags); |
| 1374 | else |
| 1375 | set_bit(AS_EIO, &mapping->flags); |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 1376 | } else { |
| 1377 | cifs_stats_bytes_written(cifs_sb->tcon, |
| 1378 | bytes_written); |
| 1379 | } |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1380 | } |
| 1381 | for (i = 0; i < n_iov; i++) { |
| 1382 | page = pvec.pages[first + i]; |
Steve French | eb9bdaa | 2006-01-27 15:11:47 -0800 | [diff] [blame] | 1383 | /* Should we also set page error on |
| 1384 | success rc but too little data written? */ |
| 1385 | /* BB investigate retry logic on temporary |
| 1386 | server crash cases and how recovery works |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1387 | when page marked as error */ |
| 1388 | if (rc) |
Steve French | eb9bdaa | 2006-01-27 15:11:47 -0800 | [diff] [blame] | 1389 | SetPageError(page); |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1390 | kunmap(page); |
| 1391 | unlock_page(page); |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1392 | end_page_writeback(page); |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1393 | page_cache_release(page); |
| 1394 | } |
| 1395 | if ((wbc->nr_to_write -= n_iov) <= 0) |
| 1396 | done = 1; |
| 1397 | index = next; |
| 1398 | } |
| 1399 | pagevec_release(&pvec); |
| 1400 | } |
| 1401 | if (!scanned && !done) { |
| 1402 | /* |
| 1403 | * We hit the last page and there is more work to be done: wrap |
| 1404 | * back to the start of the file |
| 1405 | */ |
| 1406 | scanned = 1; |
| 1407 | index = 0; |
| 1408 | goto retry; |
| 1409 | } |
OGAWA Hirofumi | 111ebb6 | 2006-06-23 02:03:26 -0700 | [diff] [blame] | 1410 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 1411 | mapping->writeback_index = index; |
| 1412 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | FreeXid(xid); |
Steve French | 9a0c823 | 2007-02-02 04:21:57 +0000 | [diff] [blame] | 1414 | kfree(iov); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | return rc; |
| 1416 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1418 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | { |
| 1420 | int rc = -EFAULT; |
| 1421 | int xid; |
| 1422 | |
| 1423 | xid = GetXid(); |
| 1424 | /* BB add check for wbc flags */ |
| 1425 | page_cache_get(page); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1426 | if (!PageUptodate(page)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | cFYI(1, ("ppw - page not up to date")); |
| 1428 | } |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1429 | |
| 1430 | /* |
| 1431 | * Set the "writeback" flag, and clear "dirty" in the radix tree. |
| 1432 | * |
| 1433 | * A writepage() implementation always needs to do either this, |
| 1434 | * or re-dirty the page with "redirty_page_for_writepage()" in |
| 1435 | * the case of a failure. |
| 1436 | * |
| 1437 | * Just unlocking the page will cause the radix tree tag-bits |
| 1438 | * to fail to update with the state of the page correctly. |
| 1439 | */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1440 | set_page_writeback(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | rc = cifs_partialpagewrite(page, 0, PAGE_CACHE_SIZE); |
| 1442 | SetPageUptodate(page); /* BB add check for error and Clearuptodate? */ |
| 1443 | unlock_page(page); |
Linus Torvalds | cb876f4 | 2006-12-23 16:19:07 -0800 | [diff] [blame] | 1444 | end_page_writeback(page); |
| 1445 | page_cache_release(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | FreeXid(xid); |
| 1447 | return rc; |
| 1448 | } |
| 1449 | |
| 1450 | static int cifs_commit_write(struct file *file, struct page *page, |
| 1451 | unsigned offset, unsigned to) |
| 1452 | { |
| 1453 | int xid; |
| 1454 | int rc = 0; |
| 1455 | struct inode *inode = page->mapping->host; |
| 1456 | loff_t position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; |
| 1457 | char *page_data; |
| 1458 | |
| 1459 | xid = GetXid(); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1460 | cFYI(1, ("commit write for page %p up to position %lld for %d", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | page, position, to)); |
Steve French | 3677db1 | 2007-02-26 16:46:11 +0000 | [diff] [blame] | 1462 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | if (position > inode->i_size) { |
| 1464 | i_size_write(inode, position); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | } |
Steve French | 3677db1 | 2007-02-26 16:46:11 +0000 | [diff] [blame] | 1466 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | if (!PageUptodate(page)) { |
| 1468 | position = ((loff_t)page->index << PAGE_CACHE_SHIFT) + offset; |
| 1469 | /* can not rely on (or let) writepage write this data */ |
| 1470 | if (to < offset) { |
| 1471 | cFYI(1, ("Illegal offsets, can not copy from %d to %d", |
| 1472 | offset, to)); |
| 1473 | FreeXid(xid); |
| 1474 | return rc; |
| 1475 | } |
| 1476 | /* this is probably better than directly calling |
| 1477 | partialpage_write since in this function the file handle is |
| 1478 | known which we might as well leverage */ |
| 1479 | /* BB check if anything else missing out of ppw |
| 1480 | such as updating last write time */ |
| 1481 | page_data = kmap(page); |
| 1482 | rc = cifs_write(file, page_data + offset, to-offset, |
| 1483 | &position); |
| 1484 | if (rc > 0) |
| 1485 | rc = 0; |
| 1486 | /* else if (rc < 0) should we set writebehind rc? */ |
| 1487 | kunmap(page); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1488 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1489 | set_page_dirty(page); |
| 1490 | } |
| 1491 | |
| 1492 | FreeXid(xid); |
| 1493 | return rc; |
| 1494 | } |
| 1495 | |
| 1496 | int cifs_fsync(struct file *file, struct dentry *dentry, int datasync) |
| 1497 | { |
| 1498 | int xid; |
| 1499 | int rc = 0; |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1500 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | |
| 1502 | xid = GetXid(); |
| 1503 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1504 | cFYI(1, ("Sync file - name: %s datasync: 0x%x", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | dentry->d_name.name, datasync)); |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1506 | |
Jeff Layton | cea2180 | 2007-11-20 23:19:03 +0000 | [diff] [blame] | 1507 | rc = filemap_write_and_wait(inode->i_mapping); |
| 1508 | if (rc == 0) { |
| 1509 | rc = CIFS_I(inode)->write_behind_rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1510 | CIFS_I(inode)->write_behind_rc = 0; |
Jeff Layton | cea2180 | 2007-11-20 23:19:03 +0000 | [diff] [blame] | 1511 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | FreeXid(xid); |
| 1513 | return rc; |
| 1514 | } |
| 1515 | |
NeilBrown | 3978d717 | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 1516 | /* static void cifs_sync_page(struct page *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | { |
| 1518 | struct address_space *mapping; |
| 1519 | struct inode *inode; |
| 1520 | unsigned long index = page->index; |
| 1521 | unsigned int rpages = 0; |
| 1522 | int rc = 0; |
| 1523 | |
| 1524 | cFYI(1, ("sync page %p",page)); |
| 1525 | mapping = page->mapping; |
| 1526 | if (!mapping) |
| 1527 | return 0; |
| 1528 | inode = mapping->host; |
| 1529 | if (!inode) |
NeilBrown | 3978d717 | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 1530 | return; */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1532 | /* fill in rpages then |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | result = cifs_pagein_inode(inode, index, rpages); */ /* BB finish */ |
| 1534 | |
Steve French | 26a21b9 | 2006-05-31 18:05:34 +0000 | [diff] [blame] | 1535 | /* 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] | 1536 | |
NeilBrown | 3978d717 | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 1537 | #if 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | if (rc < 0) |
| 1539 | return rc; |
| 1540 | return 0; |
NeilBrown | 3978d717 | 2006-03-26 01:37:17 -0800 | [diff] [blame] | 1541 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | } */ |
| 1543 | |
| 1544 | /* |
| 1545 | * As file closes, flush all cached write data for this inode checking |
| 1546 | * for write behind errors. |
| 1547 | */ |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 1548 | int cifs_flush(struct file *file, fl_owner_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1550 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | int rc = 0; |
| 1552 | |
| 1553 | /* Rather than do the steps manually: |
| 1554 | lock the inode for writing |
| 1555 | loop through pages looking for write behind data (dirty pages) |
| 1556 | coalesce into contiguous 16K (or smaller) chunks to write to server |
| 1557 | send to server (prefer in parallel) |
| 1558 | deal with writebehind errors |
| 1559 | unlock inode for writing |
| 1560 | filemapfdatawrite appears easier for the time being */ |
| 1561 | |
| 1562 | rc = filemap_fdatawrite(inode->i_mapping); |
Jeff Layton | cea2180 | 2007-11-20 23:19:03 +0000 | [diff] [blame] | 1563 | /* reset wb rc if we were able to write out dirty pages */ |
| 1564 | if (!rc) { |
| 1565 | rc = CIFS_I(inode)->write_behind_rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | CIFS_I(inode)->write_behind_rc = 0; |
Jeff Layton | cea2180 | 2007-11-20 23:19:03 +0000 | [diff] [blame] | 1567 | } |
Steve French | 50c2f75 | 2007-07-13 00:33:32 +0000 | [diff] [blame] | 1568 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1569 | cFYI(1, ("Flush inode %p file %p rc %d", inode, file, rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | |
| 1571 | return rc; |
| 1572 | } |
| 1573 | |
| 1574 | ssize_t cifs_user_read(struct file *file, char __user *read_data, |
| 1575 | size_t read_size, loff_t *poffset) |
| 1576 | { |
| 1577 | int rc = -EACCES; |
| 1578 | unsigned int bytes_read = 0; |
| 1579 | unsigned int total_read = 0; |
| 1580 | unsigned int current_read_size; |
| 1581 | struct cifs_sb_info *cifs_sb; |
| 1582 | struct cifsTconInfo *pTcon; |
| 1583 | int xid; |
| 1584 | struct cifsFileInfo *open_file; |
| 1585 | char *smb_read_data; |
| 1586 | char __user *current_offset; |
| 1587 | struct smb_com_read_rsp *pSMBr; |
| 1588 | |
| 1589 | xid = GetXid(); |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1590 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | pTcon = cifs_sb->tcon; |
| 1592 | |
| 1593 | if (file->private_data == NULL) { |
| 1594 | FreeXid(xid); |
| 1595 | return -EBADF; |
| 1596 | } |
| 1597 | open_file = (struct cifsFileInfo *)file->private_data; |
| 1598 | |
| 1599 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) { |
| 1600 | cFYI(1, ("attempting read on write only file instance")); |
| 1601 | } |
| 1602 | for (total_read = 0, current_offset = read_data; |
| 1603 | read_size > total_read; |
| 1604 | total_read += bytes_read, current_offset += bytes_read) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1605 | current_read_size = min_t(const int, read_size - total_read, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | cifs_sb->rsize); |
| 1607 | rc = -EAGAIN; |
| 1608 | smb_read_data = NULL; |
| 1609 | while (rc == -EAGAIN) { |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1610 | int buf_type = CIFS_NO_BUFFER; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1611 | if ((open_file->invalidHandle) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1612 | (!open_file->closePend)) { |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 1613 | rc = cifs_reopen_file(file, TRUE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1614 | if (rc != 0) |
| 1615 | break; |
| 1616 | } |
Steve French | bfa0d75 | 2005-08-31 21:50:37 -0700 | [diff] [blame] | 1617 | rc = CIFSSMBRead(xid, pTcon, |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1618 | open_file->netfid, |
| 1619 | current_read_size, *poffset, |
| 1620 | &bytes_read, &smb_read_data, |
| 1621 | &buf_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1622 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | if (smb_read_data) { |
Steve French | 93544cc | 2006-02-14 22:30:52 -0600 | [diff] [blame] | 1624 | if (copy_to_user(current_offset, |
| 1625 | smb_read_data + |
| 1626 | 4 /* RFC1001 length field */ + |
| 1627 | le16_to_cpu(pSMBr->DataOffset), |
| 1628 | bytes_read)) { |
| 1629 | rc = -EFAULT; |
| 1630 | } |
| 1631 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1632 | if (buf_type == CIFS_SMALL_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1633 | cifs_small_buf_release(smb_read_data); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1634 | else if (buf_type == CIFS_LARGE_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1635 | cifs_buf_release(smb_read_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | smb_read_data = NULL; |
| 1637 | } |
| 1638 | } |
| 1639 | if (rc || (bytes_read == 0)) { |
| 1640 | if (total_read) { |
| 1641 | break; |
| 1642 | } else { |
| 1643 | FreeXid(xid); |
| 1644 | return rc; |
| 1645 | } |
| 1646 | } else { |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 1647 | cifs_stats_bytes_read(pTcon, bytes_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | *poffset += bytes_read; |
| 1649 | } |
| 1650 | } |
| 1651 | FreeXid(xid); |
| 1652 | return total_read; |
| 1653 | } |
| 1654 | |
| 1655 | |
| 1656 | static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size, |
| 1657 | loff_t *poffset) |
| 1658 | { |
| 1659 | int rc = -EACCES; |
| 1660 | unsigned int bytes_read = 0; |
| 1661 | unsigned int total_read; |
| 1662 | unsigned int current_read_size; |
| 1663 | struct cifs_sb_info *cifs_sb; |
| 1664 | struct cifsTconInfo *pTcon; |
| 1665 | int xid; |
| 1666 | char *current_offset; |
| 1667 | struct cifsFileInfo *open_file; |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1668 | int buf_type = CIFS_NO_BUFFER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | |
| 1670 | xid = GetXid(); |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1671 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | pTcon = cifs_sb->tcon; |
| 1673 | |
| 1674 | if (file->private_data == NULL) { |
| 1675 | FreeXid(xid); |
| 1676 | return -EBADF; |
| 1677 | } |
| 1678 | open_file = (struct cifsFileInfo *)file->private_data; |
| 1679 | |
| 1680 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
| 1681 | cFYI(1, ("attempting read on write only file instance")); |
| 1682 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1683 | for (total_read = 0, current_offset = read_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | read_size > total_read; |
| 1685 | total_read += bytes_read, current_offset += bytes_read) { |
| 1686 | current_read_size = min_t(const int, read_size - total_read, |
| 1687 | cifs_sb->rsize); |
Steve French | f9f5c817 | 2005-09-15 23:06:38 -0700 | [diff] [blame] | 1688 | /* For windows me and 9x we do not want to request more |
| 1689 | than it negotiated since it will refuse the read then */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1690 | if ((pTcon->ses) && |
Steve French | f9f5c817 | 2005-09-15 23:06:38 -0700 | [diff] [blame] | 1691 | !(pTcon->ses->capabilities & CAP_LARGE_FILES)) { |
| 1692 | current_read_size = min_t(const int, current_read_size, |
| 1693 | pTcon->ses->server->maxBuf - 128); |
| 1694 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | rc = -EAGAIN; |
| 1696 | while (rc == -EAGAIN) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1697 | if ((open_file->invalidHandle) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | (!open_file->closePend)) { |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 1699 | rc = cifs_reopen_file(file, TRUE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | if (rc != 0) |
| 1701 | break; |
| 1702 | } |
Steve French | bfa0d75 | 2005-08-31 21:50:37 -0700 | [diff] [blame] | 1703 | rc = CIFSSMBRead(xid, pTcon, |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1704 | open_file->netfid, |
| 1705 | current_read_size, *poffset, |
| 1706 | &bytes_read, ¤t_offset, |
| 1707 | &buf_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | } |
| 1709 | if (rc || (bytes_read == 0)) { |
| 1710 | if (total_read) { |
| 1711 | break; |
| 1712 | } else { |
| 1713 | FreeXid(xid); |
| 1714 | return rc; |
| 1715 | } |
| 1716 | } else { |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 1717 | cifs_stats_bytes_read(pTcon, total_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | *poffset += bytes_read; |
| 1719 | } |
| 1720 | } |
| 1721 | FreeXid(xid); |
| 1722 | return total_read; |
| 1723 | } |
| 1724 | |
| 1725 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
| 1726 | { |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1727 | struct dentry *dentry = file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | int rc, xid; |
| 1729 | |
| 1730 | xid = GetXid(); |
| 1731 | rc = cifs_revalidate(dentry); |
| 1732 | if (rc) { |
| 1733 | cFYI(1, ("Validation prior to mmap failed, error=%d", rc)); |
| 1734 | FreeXid(xid); |
| 1735 | return rc; |
| 1736 | } |
| 1737 | rc = generic_file_mmap(file, vma); |
| 1738 | FreeXid(xid); |
| 1739 | return rc; |
| 1740 | } |
| 1741 | |
| 1742 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1743 | static void cifs_copy_cache_pages(struct address_space *mapping, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | struct list_head *pages, int bytes_read, char *data, |
| 1745 | struct pagevec *plru_pvec) |
| 1746 | { |
| 1747 | struct page *page; |
| 1748 | char *target; |
| 1749 | |
| 1750 | while (bytes_read > 0) { |
| 1751 | if (list_empty(pages)) |
| 1752 | break; |
| 1753 | |
| 1754 | page = list_entry(pages->prev, struct page, lru); |
| 1755 | list_del(&page->lru); |
| 1756 | |
| 1757 | if (add_to_page_cache(page, mapping, page->index, |
| 1758 | GFP_KERNEL)) { |
| 1759 | page_cache_release(page); |
| 1760 | cFYI(1, ("Add page cache failed")); |
Steve French | 3079ca6 | 2005-06-09 14:44:07 -0700 | [diff] [blame] | 1761 | data += PAGE_CACHE_SIZE; |
| 1762 | bytes_read -= PAGE_CACHE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | continue; |
| 1764 | } |
| 1765 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1766 | target = kmap_atomic(page, KM_USER0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | |
| 1768 | if (PAGE_CACHE_SIZE > bytes_read) { |
| 1769 | memcpy(target, data, bytes_read); |
| 1770 | /* zero the tail end of this partial page */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1771 | memset(target + bytes_read, 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1772 | PAGE_CACHE_SIZE - bytes_read); |
| 1773 | bytes_read = 0; |
| 1774 | } else { |
| 1775 | memcpy(target, data, PAGE_CACHE_SIZE); |
| 1776 | bytes_read -= PAGE_CACHE_SIZE; |
| 1777 | } |
| 1778 | kunmap_atomic(target, KM_USER0); |
| 1779 | |
| 1780 | flush_dcache_page(page); |
| 1781 | SetPageUptodate(page); |
| 1782 | unlock_page(page); |
| 1783 | if (!pagevec_add(plru_pvec, page)) |
| 1784 | __pagevec_lru_add(plru_pvec); |
| 1785 | data += PAGE_CACHE_SIZE; |
| 1786 | } |
| 1787 | return; |
| 1788 | } |
| 1789 | |
| 1790 | static int cifs_readpages(struct file *file, struct address_space *mapping, |
| 1791 | struct list_head *page_list, unsigned num_pages) |
| 1792 | { |
| 1793 | int rc = -EACCES; |
| 1794 | int xid; |
| 1795 | loff_t offset; |
| 1796 | struct page *page; |
| 1797 | struct cifs_sb_info *cifs_sb; |
| 1798 | struct cifsTconInfo *pTcon; |
Steve French | 2c2130e | 2007-10-12 19:10:28 +0000 | [diff] [blame] | 1799 | unsigned int bytes_read = 0; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1800 | unsigned int read_size, i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1801 | char *smb_read_data = NULL; |
| 1802 | struct smb_com_read_rsp *pSMBr; |
| 1803 | struct pagevec lru_pvec; |
| 1804 | struct cifsFileInfo *open_file; |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1805 | int buf_type = CIFS_NO_BUFFER; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1806 | |
| 1807 | xid = GetXid(); |
| 1808 | if (file->private_data == NULL) { |
| 1809 | FreeXid(xid); |
| 1810 | return -EBADF; |
| 1811 | } |
| 1812 | open_file = (struct cifsFileInfo *)file->private_data; |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1813 | cifs_sb = CIFS_SB(file->f_path.dentry->d_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | pTcon = cifs_sb->tcon; |
Steve French | bfa0d75 | 2005-08-31 21:50:37 -0700 | [diff] [blame] | 1815 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1816 | pagevec_init(&lru_pvec, 0); |
Steve French | 75865f8c | 2007-06-24 18:30:48 +0000 | [diff] [blame] | 1817 | #ifdef CONFIG_CIFS_DEBUG2 |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1818 | cFYI(1, ("rpages: num pages %d", num_pages)); |
| 1819 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1820 | for (i = 0; i < num_pages; ) { |
| 1821 | unsigned contig_pages; |
| 1822 | struct page *tmp_page; |
| 1823 | unsigned long expected_index; |
| 1824 | |
| 1825 | if (list_empty(page_list)) |
| 1826 | break; |
| 1827 | |
| 1828 | page = list_entry(page_list->prev, struct page, lru); |
| 1829 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 1830 | |
| 1831 | /* count adjacent pages that we will read into */ |
| 1832 | contig_pages = 0; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1833 | expected_index = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | list_entry(page_list->prev, struct page, lru)->index; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1835 | list_for_each_entry_reverse(tmp_page, page_list, lru) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1836 | if (tmp_page->index == expected_index) { |
| 1837 | contig_pages++; |
| 1838 | expected_index++; |
| 1839 | } else |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1840 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | } |
| 1842 | if (contig_pages + i > num_pages) |
| 1843 | contig_pages = num_pages - i; |
| 1844 | |
| 1845 | /* for reads over a certain size could initiate async |
| 1846 | read ahead */ |
| 1847 | |
| 1848 | read_size = contig_pages * PAGE_CACHE_SIZE; |
| 1849 | /* Read size needs to be in multiples of one page */ |
| 1850 | read_size = min_t(const unsigned int, read_size, |
| 1851 | cifs_sb->rsize & PAGE_CACHE_MASK); |
Steve French | 75865f8c | 2007-06-24 18:30:48 +0000 | [diff] [blame] | 1852 | #ifdef CONFIG_CIFS_DEBUG2 |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1853 | cFYI(1, ("rpages: read size 0x%x contiguous pages %d", |
Steve French | 75865f8c | 2007-06-24 18:30:48 +0000 | [diff] [blame] | 1854 | read_size, contig_pages)); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1855 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1856 | rc = -EAGAIN; |
| 1857 | while (rc == -EAGAIN) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1858 | if ((open_file->invalidHandle) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1859 | (!open_file->closePend)) { |
Steve French | 3a9f462 | 2007-04-04 17:10:24 +0000 | [diff] [blame] | 1860 | rc = cifs_reopen_file(file, TRUE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1861 | if (rc != 0) |
| 1862 | break; |
| 1863 | } |
| 1864 | |
Steve French | bfa0d75 | 2005-08-31 21:50:37 -0700 | [diff] [blame] | 1865 | rc = CIFSSMBRead(xid, pTcon, |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1866 | open_file->netfid, |
| 1867 | read_size, offset, |
| 1868 | &bytes_read, &smb_read_data, |
| 1869 | &buf_type); |
Steve French | a9d02ad | 2005-08-24 23:06:05 -0700 | [diff] [blame] | 1870 | /* BB more RC checks ? */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1871 | if (rc == -EAGAIN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | if (smb_read_data) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1873 | if (buf_type == CIFS_SMALL_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1874 | cifs_small_buf_release(smb_read_data); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1875 | else if (buf_type == CIFS_LARGE_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1876 | cifs_buf_release(smb_read_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1877 | smb_read_data = NULL; |
| 1878 | } |
| 1879 | } |
| 1880 | } |
| 1881 | if ((rc < 0) || (smb_read_data == NULL)) { |
| 1882 | cFYI(1, ("Read error in readpages: %d", rc)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1883 | break; |
| 1884 | } else if (bytes_read > 0) { |
Andrew Morton | 6f88cc2 | 2006-12-10 02:19:44 -0800 | [diff] [blame] | 1885 | task_io_account_read(bytes_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | pSMBr = (struct smb_com_read_rsp *)smb_read_data; |
| 1887 | cifs_copy_cache_pages(mapping, page_list, bytes_read, |
| 1888 | smb_read_data + 4 /* RFC1001 hdr */ + |
| 1889 | le16_to_cpu(pSMBr->DataOffset), &lru_pvec); |
| 1890 | |
| 1891 | i += bytes_read >> PAGE_CACHE_SHIFT; |
Steve French | a454434 | 2005-08-24 13:59:35 -0700 | [diff] [blame] | 1892 | cifs_stats_bytes_read(pTcon, bytes_read); |
Steve French | 2c2130e | 2007-10-12 19:10:28 +0000 | [diff] [blame] | 1893 | if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1894 | i++; /* account for partial page */ |
| 1895 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1896 | /* server copy of file can have smaller size |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1897 | than client */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1898 | /* BB do we need to verify this common case ? |
| 1899 | this case is ok - if we are at server EOF |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1900 | we will hit it on next read */ |
| 1901 | |
OGAWA Hirofumi | 05ac9d4 | 2006-11-02 22:07:08 -0800 | [diff] [blame] | 1902 | /* break; */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1903 | } |
| 1904 | } else { |
| 1905 | cFYI(1, ("No bytes read (%d) at offset %lld . " |
| 1906 | "Cleaning remaining pages from readahead list", |
| 1907 | bytes_read, offset)); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1908 | /* BB turn off caching and do new lookup on |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | file size at server? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1910 | break; |
| 1911 | } |
| 1912 | if (smb_read_data) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1913 | if (buf_type == CIFS_SMALL_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1914 | cifs_small_buf_release(smb_read_data); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1915 | else if (buf_type == CIFS_LARGE_BUFFER) |
Steve French | ec637e3 | 2005-12-12 20:53:18 -0800 | [diff] [blame] | 1916 | cifs_buf_release(smb_read_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1917 | smb_read_data = NULL; |
| 1918 | } |
| 1919 | bytes_read = 0; |
| 1920 | } |
| 1921 | |
| 1922 | pagevec_lru_add(&lru_pvec); |
| 1923 | |
| 1924 | /* need to free smb_read_data buf before exit */ |
| 1925 | if (smb_read_data) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1926 | if (buf_type == CIFS_SMALL_BUFFER) |
Steve French | 47c886b | 2006-01-18 14:20:39 -0800 | [diff] [blame] | 1927 | cifs_small_buf_release(smb_read_data); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1928 | else if (buf_type == CIFS_LARGE_BUFFER) |
Steve French | 47c886b | 2006-01-18 14:20:39 -0800 | [diff] [blame] | 1929 | cifs_buf_release(smb_read_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1930 | smb_read_data = NULL; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1931 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1932 | |
| 1933 | FreeXid(xid); |
| 1934 | return rc; |
| 1935 | } |
| 1936 | |
| 1937 | static int cifs_readpage_worker(struct file *file, struct page *page, |
| 1938 | loff_t *poffset) |
| 1939 | { |
| 1940 | char *read_data; |
| 1941 | int rc; |
| 1942 | |
| 1943 | page_cache_get(page); |
| 1944 | read_data = kmap(page); |
| 1945 | /* for reads over a certain size could initiate async read ahead */ |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1946 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1947 | rc = cifs_read(file, read_data, PAGE_CACHE_SIZE, poffset); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1948 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | if (rc < 0) |
| 1950 | goto io_error; |
| 1951 | else |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1952 | cFYI(1, ("Bytes read %d", rc)); |
| 1953 | |
Josef "Jeff" Sipek | e6a0029 | 2006-12-08 02:36:48 -0800 | [diff] [blame] | 1954 | file->f_path.dentry->d_inode->i_atime = |
| 1955 | current_fs_time(file->f_path.dentry->d_inode->i_sb); |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1956 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1957 | if (PAGE_CACHE_SIZE > rc) |
| 1958 | memset(read_data + rc, 0, PAGE_CACHE_SIZE - rc); |
| 1959 | |
| 1960 | flush_dcache_page(page); |
| 1961 | SetPageUptodate(page); |
| 1962 | rc = 0; |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1963 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1964 | io_error: |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1965 | kunmap(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | page_cache_release(page); |
| 1967 | return rc; |
| 1968 | } |
| 1969 | |
| 1970 | static int cifs_readpage(struct file *file, struct page *page) |
| 1971 | { |
| 1972 | loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 1973 | int rc = -EACCES; |
| 1974 | int xid; |
| 1975 | |
| 1976 | xid = GetXid(); |
| 1977 | |
| 1978 | if (file->private_data == NULL) { |
| 1979 | FreeXid(xid); |
| 1980 | return -EBADF; |
| 1981 | } |
| 1982 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 1983 | cFYI(1, ("readpage %p at offset %d 0x%x\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1984 | page, (int)offset, (int)offset)); |
| 1985 | |
| 1986 | rc = cifs_readpage_worker(file, page, &offset); |
| 1987 | |
| 1988 | unlock_page(page); |
| 1989 | |
| 1990 | FreeXid(xid); |
| 1991 | return rc; |
| 1992 | } |
| 1993 | |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 1994 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
| 1995 | { |
| 1996 | struct cifsFileInfo *open_file; |
| 1997 | |
| 1998 | read_lock(&GlobalSMBSeslock); |
| 1999 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
| 2000 | if (open_file->closePend) |
| 2001 | continue; |
| 2002 | if (open_file->pfile && |
| 2003 | ((open_file->pfile->f_flags & O_RDWR) || |
| 2004 | (open_file->pfile->f_flags & O_WRONLY))) { |
| 2005 | read_unlock(&GlobalSMBSeslock); |
| 2006 | return 1; |
| 2007 | } |
| 2008 | } |
| 2009 | read_unlock(&GlobalSMBSeslock); |
| 2010 | return 0; |
| 2011 | } |
| 2012 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2013 | /* We do not want to update the file size from server for inodes |
| 2014 | open for write - to avoid races with writepage extending |
| 2015 | the file - in the future we could consider allowing |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2016 | refreshing the inode only on increases in the file size |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2017 | but this is tricky to do without racing with writebehind |
| 2018 | page caching in the current Linux kernel design */ |
Steve French | 7ba5263 | 2007-02-08 18:14:13 +0000 | [diff] [blame] | 2019 | int is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2020 | { |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 2021 | if (!cifsInode) |
| 2022 | return 1; |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 2023 | |
Steve French | a403a0a | 2007-07-26 15:54:16 +0000 | [diff] [blame] | 2024 | if (is_inode_writable(cifsInode)) { |
| 2025 | /* This inode is open for write at least once */ |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 2026 | struct cifs_sb_info *cifs_sb; |
| 2027 | |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 2028 | cifs_sb = CIFS_SB(cifsInode->vfs_inode.i_sb); |
| 2029 | if ( cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO ) { |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2030 | /* since no page cache to corrupt on directio |
Steve French | c32a0b6 | 2006-01-12 14:41:28 -0800 | [diff] [blame] | 2031 | we can change size safely */ |
| 2032 | return 1; |
| 2033 | } |
| 2034 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2035 | if (i_size_read(&cifsInode->vfs_inode) < end_of_file) |
Steve French | 7ba5263 | 2007-02-08 18:14:13 +0000 | [diff] [blame] | 2036 | return 1; |
| 2037 | |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 2038 | return 0; |
Steve French | 23e7dd7 | 2005-10-20 13:44:56 -0700 | [diff] [blame] | 2039 | } else |
Steve French | 6148a74 | 2005-10-05 12:23:19 -0700 | [diff] [blame] | 2040 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | } |
| 2042 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2043 | static int cifs_prepare_write(struct file *file, struct page *page, |
| 2044 | unsigned from, unsigned to) |
| 2045 | { |
| 2046 | int rc = 0; |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 2047 | loff_t i_size; |
| 2048 | loff_t offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2049 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2050 | cFYI(1, ("prepare write for page %p from %d to %d", page, from, to)); |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 2051 | if (PageUptodate(page)) |
| 2052 | return 0; |
| 2053 | |
| 2054 | /* If we are writing a full page it will be up to date, |
| 2055 | no need to read from the server */ |
| 2056 | if ((to == PAGE_CACHE_SIZE) && (from == 0)) { |
| 2057 | SetPageUptodate(page); |
| 2058 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | } |
| 2060 | |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 2061 | offset = (loff_t)page->index << PAGE_CACHE_SHIFT; |
| 2062 | i_size = i_size_read(page->mapping->host); |
| 2063 | |
| 2064 | if ((offset >= i_size) || |
| 2065 | ((from == 0) && (offset + to) >= i_size)) { |
| 2066 | /* |
| 2067 | * We don't need to read data beyond the end of the file. |
| 2068 | * zero it, and set the page uptodate |
| 2069 | */ |
Nate | 8803863 | 2007-07-16 15:45:13 +0000 | [diff] [blame] | 2070 | simple_prepare_write(file, page, from, to); |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 2071 | SetPageUptodate(page); |
| 2072 | } else if ((file->f_flags & O_ACCMODE) != O_WRONLY) { |
| 2073 | /* might as well read a page, it is fast enough */ |
| 2074 | rc = cifs_readpage_worker(file, page, &offset); |
| 2075 | } else { |
| 2076 | /* we could try using another file handle if there is one - |
| 2077 | but how would we lock it to prevent close of that handle |
| 2078 | racing with this read? In any case |
| 2079 | this will be written out by commit_write so is fine */ |
| 2080 | } |
| 2081 | |
Steve French | fb8c4b1 | 2007-07-10 01:16:18 +0000 | [diff] [blame] | 2082 | /* we do not need to pass errors back |
| 2083 | e.g. if we do not have read access to the file |
Steve French | 8a23626 | 2007-03-06 00:31:00 +0000 | [diff] [blame] | 2084 | because cifs_commit_write will do the right thing. -- shaggy */ |
| 2085 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2086 | return 0; |
| 2087 | } |
| 2088 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 2089 | const struct address_space_operations cifs_addr_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | .readpage = cifs_readpage, |
| 2091 | .readpages = cifs_readpages, |
| 2092 | .writepage = cifs_writepage, |
Steve French | 37c0eb4 | 2005-10-05 14:50:29 -0700 | [diff] [blame] | 2093 | .writepages = cifs_writepages, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2094 | .prepare_write = cifs_prepare_write, |
| 2095 | .commit_write = cifs_commit_write, |
| 2096 | .set_page_dirty = __set_page_dirty_nobuffers, |
| 2097 | /* .sync_page = cifs_sync_page, */ |
| 2098 | /* .direct_IO = */ |
| 2099 | }; |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 2100 | |
| 2101 | /* |
| 2102 | * cifs_readpages requires the server to support a buffer large enough to |
| 2103 | * contain the header plus one complete page of data. Otherwise, we need |
| 2104 | * to leave cifs_readpages out of the address space operations. |
| 2105 | */ |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 2106 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
Dave Kleikamp | 273d81d | 2006-06-01 19:41:23 +0000 | [diff] [blame] | 2107 | .readpage = cifs_readpage, |
| 2108 | .writepage = cifs_writepage, |
| 2109 | .writepages = cifs_writepages, |
| 2110 | .prepare_write = cifs_prepare_write, |
| 2111 | .commit_write = cifs_commit_write, |
| 2112 | .set_page_dirty = __set_page_dirty_nobuffers, |
| 2113 | /* .sync_page = cifs_sync_page, */ |
| 2114 | /* .direct_IO = */ |
| 2115 | }; |