Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/nfs/file.c |
| 3 | * |
| 4 | * Copyright (C) 1992 Rick Sladkey |
| 5 | * |
| 6 | * Changes Copyright (C) 1994 by Florian La Roche |
| 7 | * - Do not copy data too often around in the kernel. |
| 8 | * - In nfs_file_read the return value of kmalloc wasn't checked. |
| 9 | * - Put in a better version of read look-ahead buffering. Original idea |
| 10 | * and implementation by Wai S Kok elekokws@ee.nus.sg. |
| 11 | * |
| 12 | * Expire cache on write to a file by Wai S Kok (Oct 1994). |
| 13 | * |
| 14 | * Total rewrite of read side for new NFS buffer cache.. Linus. |
| 15 | * |
| 16 | * nfs regular file handling functions |
| 17 | */ |
| 18 | |
| 19 | #include <linux/time.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/errno.h> |
| 22 | #include <linux/fcntl.h> |
| 23 | #include <linux/stat.h> |
| 24 | #include <linux/nfs_fs.h> |
| 25 | #include <linux/nfs_mount.h> |
| 26 | #include <linux/mm.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/pagemap.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 29 | #include <linux/aio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
| 31 | #include <asm/uaccess.h> |
| 32 | #include <asm/system.h> |
| 33 | |
| 34 | #include "delegation.h" |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 35 | #include "internal.h" |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 36 | #include "iostat.h" |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 37 | #include "fscache.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | #define NFSDBG_FACILITY NFSDBG_FILE |
| 40 | |
| 41 | static int nfs_file_open(struct inode *, struct file *); |
| 42 | static int nfs_file_release(struct inode *, struct file *); |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 43 | static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | static int nfs_file_mmap(struct file *, struct vm_area_struct *); |
Jens Axboe | f0930ff | 2007-06-01 11:51:43 +0200 | [diff] [blame] | 45 | static ssize_t nfs_file_splice_read(struct file *filp, loff_t *ppos, |
| 46 | struct pipe_inode_info *pipe, |
| 47 | size_t count, unsigned int flags); |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 48 | static ssize_t nfs_file_read(struct kiocb *, const struct iovec *iov, |
| 49 | unsigned long nr_segs, loff_t pos); |
Suresh Jayaraman | bf40d34 | 2009-06-17 18:02:09 -0700 | [diff] [blame] | 50 | static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe, |
| 51 | struct file *filp, loff_t *ppos, |
| 52 | size_t count, unsigned int flags); |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 53 | static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov, |
| 54 | unsigned long nr_segs, loff_t pos); |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 55 | static int nfs_file_flush(struct file *, fl_owner_t id); |
Chuck Lever | 5491778 | 2008-05-27 16:29:07 -0400 | [diff] [blame] | 56 | static int nfs_file_fsync(struct file *, struct dentry *dentry, int datasync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | static int nfs_check_flags(int flags); |
| 58 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl); |
| 59 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl); |
J. Bruce Fields | 370f659 | 2007-06-08 15:23:34 -0400 | [diff] [blame] | 60 | static int nfs_setlease(struct file *file, long arg, struct file_lock **fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 62 | static struct vm_operations_struct nfs_file_vm_ops; |
| 63 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 64 | const struct file_operations nfs_file_operations = { |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 65 | .llseek = nfs_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | .read = do_sync_read, |
| 67 | .write = do_sync_write, |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 68 | .aio_read = nfs_file_read, |
| 69 | .aio_write = nfs_file_write, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | .mmap = nfs_file_mmap, |
| 71 | .open = nfs_file_open, |
| 72 | .flush = nfs_file_flush, |
| 73 | .release = nfs_file_release, |
Chuck Lever | 5491778 | 2008-05-27 16:29:07 -0400 | [diff] [blame] | 74 | .fsync = nfs_file_fsync, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | .lock = nfs_lock, |
| 76 | .flock = nfs_flock, |
Jens Axboe | f0930ff | 2007-06-01 11:51:43 +0200 | [diff] [blame] | 77 | .splice_read = nfs_file_splice_read, |
Suresh Jayaraman | bf40d34 | 2009-06-17 18:02:09 -0700 | [diff] [blame] | 78 | .splice_write = nfs_file_splice_write, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | .check_flags = nfs_check_flags, |
J. Bruce Fields | 370f659 | 2007-06-08 15:23:34 -0400 | [diff] [blame] | 80 | .setlease = nfs_setlease, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | }; |
| 82 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 83 | const struct inode_operations nfs_file_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | .permission = nfs_permission, |
| 85 | .getattr = nfs_getattr, |
| 86 | .setattr = nfs_setattr, |
| 87 | }; |
| 88 | |
Andreas Gruenbacher | b7fa055 | 2005-06-22 17:16:27 +0000 | [diff] [blame] | 89 | #ifdef CONFIG_NFS_V3 |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 90 | const struct inode_operations nfs3_file_inode_operations = { |
Andreas Gruenbacher | b7fa055 | 2005-06-22 17:16:27 +0000 | [diff] [blame] | 91 | .permission = nfs_permission, |
| 92 | .getattr = nfs_getattr, |
| 93 | .setattr = nfs_setattr, |
| 94 | .listxattr = nfs3_listxattr, |
| 95 | .getxattr = nfs3_getxattr, |
| 96 | .setxattr = nfs3_setxattr, |
| 97 | .removexattr = nfs3_removexattr, |
| 98 | }; |
| 99 | #endif /* CONFIG_NFS_v3 */ |
| 100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | /* Hack for future NFS swap support */ |
| 102 | #ifndef IS_SWAPFILE |
| 103 | # define IS_SWAPFILE(inode) (0) |
| 104 | #endif |
| 105 | |
| 106 | static int nfs_check_flags(int flags) |
| 107 | { |
| 108 | if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) |
| 109 | return -EINVAL; |
| 110 | |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | /* |
| 115 | * Open file |
| 116 | */ |
| 117 | static int |
| 118 | nfs_file_open(struct inode *inode, struct file *filp) |
| 119 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | int res; |
| 121 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 122 | dprintk("NFS: open file(%s/%s)\n", |
Chuck Lever | cc0dd2d | 2008-06-11 17:55:42 -0400 | [diff] [blame] | 123 | filp->f_path.dentry->d_parent->d_name.name, |
| 124 | filp->f_path.dentry->d_name.name); |
| 125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | res = nfs_check_flags(filp->f_flags); |
| 127 | if (res) |
| 128 | return res; |
| 129 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 130 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); |
Trond Myklebust | 46cb650 | 2008-06-11 16:32:46 -0400 | [diff] [blame] | 131 | res = nfs_open(inode, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | return res; |
| 133 | } |
| 134 | |
| 135 | static int |
| 136 | nfs_file_release(struct inode *inode, struct file *filp) |
| 137 | { |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 138 | struct dentry *dentry = filp->f_path.dentry; |
| 139 | |
| 140 | dprintk("NFS: release(%s/%s)\n", |
| 141 | dentry->d_parent->d_name.name, |
| 142 | dentry->d_name.name); |
| 143 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 144 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
Trond Myklebust | 46cb650 | 2008-06-11 16:32:46 -0400 | [diff] [blame] | 145 | return nfs_release(inode, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | } |
| 147 | |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 148 | /** |
| 149 | * nfs_revalidate_size - Revalidate the file size |
| 150 | * @inode - pointer to inode struct |
| 151 | * @file - pointer to struct file |
| 152 | * |
| 153 | * Revalidates the file length. This is basically a wrapper around |
| 154 | * nfs_revalidate_inode() that takes into account the fact that we may |
| 155 | * have cached writes (in which case we don't care about the server's |
| 156 | * idea of what the file length is), or O_DIRECT (in which case we |
| 157 | * shouldn't trust the cache). |
| 158 | */ |
| 159 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) |
| 160 | { |
| 161 | struct nfs_server *server = NFS_SERVER(inode); |
| 162 | struct nfs_inode *nfsi = NFS_I(inode); |
| 163 | |
| 164 | if (server->flags & NFS_MOUNT_NOAC) |
| 165 | goto force_reval; |
| 166 | if (filp->f_flags & O_DIRECT) |
| 167 | goto force_reval; |
| 168 | if (nfsi->npages != 0) |
| 169 | return 0; |
Chuck Lever | 5529680 | 2005-08-18 11:24:09 -0700 | [diff] [blame] | 170 | if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode)) |
Trond Myklebust | fe51bee | 2005-06-22 17:16:30 +0000 | [diff] [blame] | 171 | return 0; |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 172 | force_reval: |
| 173 | return __nfs_revalidate_inode(server, inode); |
| 174 | } |
| 175 | |
| 176 | static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) |
| 177 | { |
Andi Kleen | 9465efc | 2008-06-27 11:05:24 +0200 | [diff] [blame] | 178 | loff_t loff; |
Trond Myklebust | e89e896 | 2008-07-15 18:34:16 -0400 | [diff] [blame] | 179 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 180 | dprintk("NFS: llseek file(%s/%s, %lld, %d)\n", |
Chuck Lever | b84e06c | 2008-06-11 17:55:34 -0400 | [diff] [blame] | 181 | filp->f_path.dentry->d_parent->d_name.name, |
| 182 | filp->f_path.dentry->d_name.name, |
| 183 | offset, origin); |
| 184 | |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 185 | /* origin == SEEK_END => we must revalidate the cached file length */ |
Josef 'Jeff' Sipek | aec5e17 | 2006-09-16 21:09:32 -0400 | [diff] [blame] | 186 | if (origin == SEEK_END) { |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 187 | struct inode *inode = filp->f_mapping->host; |
Trond Myklebust | d5e6634 | 2008-09-23 17:28:35 -0400 | [diff] [blame] | 188 | |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 189 | int retval = nfs_revalidate_file_size(inode, filp); |
| 190 | if (retval < 0) |
| 191 | return (loff_t)retval; |
Trond Myklebust | d5e6634 | 2008-09-23 17:28:35 -0400 | [diff] [blame] | 192 | |
| 193 | spin_lock(&inode->i_lock); |
| 194 | loff = generic_file_llseek_unlocked(filp, offset, origin); |
| 195 | spin_unlock(&inode->i_lock); |
| 196 | } else |
| 197 | loff = generic_file_llseek_unlocked(filp, offset, origin); |
Andi Kleen | 9465efc | 2008-06-27 11:05:24 +0200 | [diff] [blame] | 198 | return loff; |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 199 | } |
| 200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | /* |
Chuck Lever | 5491778 | 2008-05-27 16:29:07 -0400 | [diff] [blame] | 202 | * Helper for nfs_file_flush() and nfs_file_fsync() |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 203 | * |
| 204 | * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to |
| 205 | * disk, but it retrieves and clears ctx->error after synching, despite |
| 206 | * the two being set at the same time in nfs_context_set_write_error(). |
| 207 | * This is because the former is used to notify the _next_ call to |
| 208 | * nfs_file_write() that a write error occured, and hence cause it to |
| 209 | * fall back to doing a synchronous write. |
| 210 | */ |
| 211 | static int nfs_do_fsync(struct nfs_open_context *ctx, struct inode *inode) |
| 212 | { |
| 213 | int have_error, status; |
| 214 | int ret = 0; |
| 215 | |
| 216 | have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); |
| 217 | status = nfs_wb_all(inode); |
| 218 | have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); |
| 219 | if (have_error) |
| 220 | ret = xchg(&ctx->error, 0); |
| 221 | if (!ret) |
| 222 | ret = status; |
| 223 | return ret; |
| 224 | } |
| 225 | |
| 226 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | * Flush all dirty pages, and check for write errors. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | */ |
| 229 | static int |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 230 | nfs_file_flush(struct file *file, fl_owner_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 232 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 233 | struct dentry *dentry = file->f_path.dentry; |
| 234 | struct inode *inode = dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 236 | dprintk("NFS: flush(%s/%s)\n", |
| 237 | dentry->d_parent->d_name.name, |
| 238 | dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
| 240 | if ((file->f_mode & FMODE_WRITE) == 0) |
| 241 | return 0; |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 242 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 243 | |
Trond Myklebust | 7fe5c39 | 2009-03-19 15:35:50 -0400 | [diff] [blame] | 244 | /* Flush writes to the server and return any errors */ |
| 245 | return nfs_do_fsync(ctx, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | } |
| 247 | |
| 248 | static ssize_t |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 249 | nfs_file_read(struct kiocb *iocb, const struct iovec *iov, |
| 250 | unsigned long nr_segs, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 252 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | struct inode * inode = dentry->d_inode; |
| 254 | ssize_t result; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 255 | size_t count = iov_length(iov, nr_segs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | if (iocb->ki_filp->f_flags & O_DIRECT) |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 258 | return nfs_file_direct_read(iocb, iov, nr_segs, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 260 | dprintk("NFS: read(%s/%s, %lu@%lu)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 262 | (unsigned long) count, (unsigned long) pos); |
| 263 | |
Trond Myklebust | 44b1187 | 2006-05-25 01:40:59 -0400 | [diff] [blame] | 264 | result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 265 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | if (!result) |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 267 | result = generic_file_aio_read(iocb, iov, nr_segs, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | return result; |
| 269 | } |
| 270 | |
| 271 | static ssize_t |
Jens Axboe | f0930ff | 2007-06-01 11:51:43 +0200 | [diff] [blame] | 272 | nfs_file_splice_read(struct file *filp, loff_t *ppos, |
| 273 | struct pipe_inode_info *pipe, size_t count, |
| 274 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 276 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | struct inode *inode = dentry->d_inode; |
| 278 | ssize_t res; |
| 279 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 280 | dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 282 | (unsigned long) count, (unsigned long long) *ppos); |
| 283 | |
Trond Myklebust | 44b1187 | 2006-05-25 01:40:59 -0400 | [diff] [blame] | 284 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | if (!res) |
Jens Axboe | f0930ff | 2007-06-01 11:51:43 +0200 | [diff] [blame] | 286 | res = generic_file_splice_read(filp, ppos, pipe, count, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | return res; |
| 288 | } |
| 289 | |
| 290 | static int |
| 291 | nfs_file_mmap(struct file * file, struct vm_area_struct * vma) |
| 292 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 293 | struct dentry *dentry = file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | struct inode *inode = dentry->d_inode; |
| 295 | int status; |
| 296 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 297 | dprintk("NFS: mmap(%s/%s)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 299 | |
Trond Myklebust | e1ebfd3 | 2009-03-11 14:37:54 -0400 | [diff] [blame] | 300 | /* Note: generic_file_mmap() returns ENOSYS on nommu systems |
| 301 | * so we call that before revalidating the mapping |
| 302 | */ |
| 303 | status = generic_file_mmap(file, vma); |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 304 | if (!status) { |
| 305 | vma->vm_ops = &nfs_file_vm_ops; |
Trond Myklebust | e1ebfd3 | 2009-03-11 14:37:54 -0400 | [diff] [blame] | 306 | status = nfs_revalidate_mapping(inode, file->f_mapping); |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 307 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | return status; |
| 309 | } |
| 310 | |
| 311 | /* |
| 312 | * Flush any dirty pages for this process, and check for write errors. |
| 313 | * The return status from this call provides a reliable indication of |
| 314 | * whether any write errors occurred for this process. |
| 315 | */ |
| 316 | static int |
Chuck Lever | 5491778 | 2008-05-27 16:29:07 -0400 | [diff] [blame] | 317 | nfs_file_fsync(struct file *file, struct dentry *dentry, int datasync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 319 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | struct inode *inode = dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 322 | dprintk("NFS: fsync file(%s/%s) datasync %d\n", |
Chuck Lever | 5491778 | 2008-05-27 16:29:07 -0400 | [diff] [blame] | 323 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 324 | datasync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 326 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 327 | return nfs_do_fsync(ctx, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | /* |
Peter Staubach | 38c7304 | 2009-08-10 08:54:16 -0400 | [diff] [blame] | 331 | * Decide whether a read/modify/write cycle may be more efficient |
| 332 | * then a modify/write/read cycle when writing to a page in the |
| 333 | * page cache. |
| 334 | * |
| 335 | * The modify/write/read cycle may occur if a page is read before |
| 336 | * being completely filled by the writer. In this situation, the |
| 337 | * page must be completely written to stable storage on the server |
| 338 | * before it can be refilled by reading in the page from the server. |
| 339 | * This can lead to expensive, small, FILE_SYNC mode writes being |
| 340 | * done. |
| 341 | * |
| 342 | * It may be more efficient to read the page first if the file is |
| 343 | * open for reading in addition to writing, the page is not marked |
| 344 | * as Uptodate, it is not dirty or waiting to be committed, |
| 345 | * indicating that it was previously allocated and then modified, |
| 346 | * that there were valid bytes of data in that range of the file, |
| 347 | * and that the new data won't completely replace the old data in |
| 348 | * that range of the file. |
| 349 | */ |
| 350 | static int nfs_want_read_modify_write(struct file *file, struct page *page, |
| 351 | loff_t pos, unsigned len) |
| 352 | { |
| 353 | unsigned int pglen = nfs_page_length(page); |
| 354 | unsigned int offset = pos & (PAGE_CACHE_SIZE - 1); |
| 355 | unsigned int end = offset + len; |
| 356 | |
| 357 | if ((file->f_mode & FMODE_READ) && /* open for read? */ |
| 358 | !PageUptodate(page) && /* Uptodate? */ |
| 359 | !PagePrivate(page) && /* i/o request already? */ |
| 360 | pglen && /* valid bytes of file? */ |
| 361 | (end < pglen || offset)) /* replace all valid bytes? */ |
| 362 | return 1; |
| 363 | return 0; |
| 364 | } |
| 365 | |
| 366 | /* |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 367 | * This does the "real" work of the write. We must allocate and lock the |
| 368 | * page to be sent back to the generic routine, which then copies the |
| 369 | * data from user space. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | * |
| 371 | * If the writer ends up delaying the write, the writer needs to |
| 372 | * increment the page use counts until he is done with the page. |
| 373 | */ |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 374 | static int nfs_write_begin(struct file *file, struct address_space *mapping, |
| 375 | loff_t pos, unsigned len, unsigned flags, |
| 376 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | { |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 378 | int ret; |
Peter Staubach | 38c7304 | 2009-08-10 08:54:16 -0400 | [diff] [blame] | 379 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 380 | struct page *page; |
Peter Staubach | 38c7304 | 2009-08-10 08:54:16 -0400 | [diff] [blame] | 381 | int once_thru = 0; |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 382 | |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 383 | dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n", |
| 384 | file->f_path.dentry->d_parent->d_name.name, |
| 385 | file->f_path.dentry->d_name.name, |
| 386 | mapping->host->i_ino, len, (long long) pos); |
| 387 | |
Peter Staubach | 38c7304 | 2009-08-10 08:54:16 -0400 | [diff] [blame] | 388 | start: |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 389 | /* |
| 390 | * Prevent starvation issues if someone is doing a consistency |
| 391 | * sync-to-disk |
| 392 | */ |
| 393 | ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING, |
| 394 | nfs_wait_bit_killable, TASK_KILLABLE); |
| 395 | if (ret) |
| 396 | return ret; |
| 397 | |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 398 | page = grab_cache_page_write_begin(mapping, index, flags); |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 399 | if (!page) |
| 400 | return -ENOMEM; |
| 401 | *pagep = page; |
| 402 | |
| 403 | ret = nfs_flush_incompatible(file, page); |
| 404 | if (ret) { |
| 405 | unlock_page(page); |
| 406 | page_cache_release(page); |
Peter Staubach | 38c7304 | 2009-08-10 08:54:16 -0400 | [diff] [blame] | 407 | } else if (!once_thru && |
| 408 | nfs_want_read_modify_write(file, page, pos, len)) { |
| 409 | once_thru = 1; |
| 410 | ret = nfs_readpage(file, page); |
| 411 | page_cache_release(page); |
| 412 | if (!ret) |
| 413 | goto start; |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 414 | } |
| 415 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | } |
| 417 | |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 418 | static int nfs_write_end(struct file *file, struct address_space *mapping, |
| 419 | loff_t pos, unsigned len, unsigned copied, |
| 420 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | { |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 422 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
| 423 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 425 | dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n", |
| 426 | file->f_path.dentry->d_parent->d_name.name, |
| 427 | file->f_path.dentry->d_name.name, |
| 428 | mapping->host->i_ino, len, (long long) pos); |
| 429 | |
Trond Myklebust | efc91ed | 2008-06-10 18:31:00 -0400 | [diff] [blame] | 430 | /* |
| 431 | * Zero any uninitialised parts of the page, and then mark the page |
| 432 | * as up to date if it turns out that we're extending the file. |
| 433 | */ |
| 434 | if (!PageUptodate(page)) { |
| 435 | unsigned pglen = nfs_page_length(page); |
| 436 | unsigned end = offset + len; |
| 437 | |
| 438 | if (pglen == 0) { |
| 439 | zero_user_segments(page, 0, offset, |
| 440 | end, PAGE_CACHE_SIZE); |
| 441 | SetPageUptodate(page); |
| 442 | } else if (end >= pglen) { |
| 443 | zero_user_segment(page, end, PAGE_CACHE_SIZE); |
| 444 | if (offset == 0) |
| 445 | SetPageUptodate(page); |
| 446 | } else |
| 447 | zero_user_segment(page, pglen, PAGE_CACHE_SIZE); |
| 448 | } |
| 449 | |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 450 | status = nfs_updatepage(file, page, offset, copied); |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 451 | |
| 452 | unlock_page(page); |
| 453 | page_cache_release(page); |
| 454 | |
Chuck Lever | 3d509e5 | 2007-12-20 14:55:04 -0500 | [diff] [blame] | 455 | if (status < 0) |
| 456 | return status; |
| 457 | return copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | } |
| 459 | |
David Howells | 6b9b351 | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 460 | /* |
| 461 | * Partially or wholly invalidate a page |
| 462 | * - Release the private state associated with a page if undergoing complete |
| 463 | * page invalidation |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 464 | * - Called if either PG_private or PG_fscache is set on the page |
David Howells | 6b9b351 | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 465 | * - Caller holds page lock |
| 466 | */ |
NeilBrown | 2ff28e2 | 2006-03-26 01:37:18 -0800 | [diff] [blame] | 467 | static void nfs_invalidate_page(struct page *page, unsigned long offset) |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 468 | { |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 469 | dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset); |
| 470 | |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 471 | if (offset != 0) |
| 472 | return; |
Trond Myklebust | d2ccddf | 2006-05-31 01:13:38 -0400 | [diff] [blame] | 473 | /* Cancel any unstarted writes on this page */ |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 474 | nfs_wb_page_cancel(page->mapping->host, page); |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 475 | |
| 476 | nfs_fscache_invalidate_page(page, page->mapping->host); |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 477 | } |
| 478 | |
David Howells | 6b9b351 | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 479 | /* |
| 480 | * Attempt to release the private state associated with a page |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 481 | * - Called if either PG_private or PG_fscache is set on the page |
David Howells | 6b9b351 | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 482 | * - Caller holds page lock |
| 483 | * - Return true (may release page) or false (may not) |
| 484 | */ |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 485 | static int nfs_release_page(struct page *page, gfp_t gfp) |
| 486 | { |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 487 | dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page); |
| 488 | |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 489 | /* If PagePrivate() is set, then the page is not freeable */ |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 490 | if (PagePrivate(page)) |
| 491 | return 0; |
| 492 | return nfs_fscache_release_page(page, gfp); |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 493 | } |
| 494 | |
David Howells | 6b9b351 | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 495 | /* |
| 496 | * Attempt to clear the private state associated with a page when an error |
| 497 | * occurs that requires the cached contents of an inode to be written back or |
| 498 | * destroyed |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 499 | * - Called if either PG_private or fscache is set on the page |
David Howells | 6b9b351 | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 500 | * - Caller holds page lock |
| 501 | * - Return 0 if successful, -error otherwise |
| 502 | */ |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 503 | static int nfs_launder_page(struct page *page) |
| 504 | { |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 505 | struct inode *inode = page->mapping->host; |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 506 | struct nfs_inode *nfsi = NFS_I(inode); |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 507 | |
| 508 | dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n", |
| 509 | inode->i_ino, (long long)page_offset(page)); |
| 510 | |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 511 | nfs_fscache_wait_on_page_write(nfsi, page); |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 512 | return nfs_wb_page(inode, page); |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 513 | } |
| 514 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 515 | const struct address_space_operations nfs_file_aops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | .readpage = nfs_readpage, |
| 517 | .readpages = nfs_readpages, |
Trond Myklebust | 9cccef9 | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 518 | .set_page_dirty = __set_page_dirty_nobuffers, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | .writepage = nfs_writepage, |
| 520 | .writepages = nfs_writepages, |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 521 | .write_begin = nfs_write_begin, |
| 522 | .write_end = nfs_write_end, |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 523 | .invalidatepage = nfs_invalidate_page, |
| 524 | .releasepage = nfs_release_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | .direct_IO = nfs_direct_IO, |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 526 | .migratepage = nfs_migrate_page, |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 527 | .launder_page = nfs_launder_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | }; |
| 529 | |
David Howells | 6b9b351 | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 530 | /* |
| 531 | * Notification that a PTE pointing to an NFS page is about to be made |
| 532 | * writable, implying that someone is about to modify the page through a |
| 533 | * shared-writable mapping |
| 534 | */ |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 535 | static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 536 | { |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 537 | struct page *page = vmf->page; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 538 | struct file *filp = vma->vm_file; |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 539 | struct dentry *dentry = filp->f_path.dentry; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 540 | unsigned pagelen; |
| 541 | int ret = -EINVAL; |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 542 | struct address_space *mapping; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 543 | |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 544 | dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n", |
| 545 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 546 | filp->f_mapping->host->i_ino, |
| 547 | (long long)page_offset(page)); |
| 548 | |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 549 | /* make sure the cache has finished storing the page */ |
| 550 | nfs_fscache_wait_on_page_write(NFS_I(dentry->d_inode), page); |
| 551 | |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 552 | lock_page(page); |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 553 | mapping = page->mapping; |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 554 | if (mapping != dentry->d_inode->i_mapping) |
Trond Myklebust | 8b1f9ee | 2008-01-22 17:13:06 -0500 | [diff] [blame] | 555 | goto out_unlock; |
| 556 | |
| 557 | ret = 0; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 558 | pagelen = nfs_page_length(page); |
Trond Myklebust | 8b1f9ee | 2008-01-22 17:13:06 -0500 | [diff] [blame] | 559 | if (pagelen == 0) |
| 560 | goto out_unlock; |
| 561 | |
| 562 | ret = nfs_flush_incompatible(filp, page); |
| 563 | if (ret != 0) |
| 564 | goto out_unlock; |
| 565 | |
| 566 | ret = nfs_updatepage(filp, page, 0, pagelen); |
Trond Myklebust | 8b1f9ee | 2008-01-22 17:13:06 -0500 | [diff] [blame] | 567 | out_unlock: |
Trond Myklebust | 7fdf523 | 2009-04-24 17:32:22 -0400 | [diff] [blame] | 568 | if (!ret) |
| 569 | return VM_FAULT_LOCKED; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 570 | unlock_page(page); |
Trond Myklebust | 7fdf523 | 2009-04-24 17:32:22 -0400 | [diff] [blame] | 571 | return VM_FAULT_SIGBUS; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 572 | } |
| 573 | |
| 574 | static struct vm_operations_struct nfs_file_vm_ops = { |
| 575 | .fault = filemap_fault, |
| 576 | .page_mkwrite = nfs_vm_page_mkwrite, |
| 577 | }; |
| 578 | |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 579 | static int nfs_need_sync_write(struct file *filp, struct inode *inode) |
| 580 | { |
| 581 | struct nfs_open_context *ctx; |
| 582 | |
| 583 | if (IS_SYNC(inode) || (filp->f_flags & O_SYNC)) |
| 584 | return 1; |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 585 | ctx = nfs_file_open_context(filp); |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 586 | if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags)) |
| 587 | return 1; |
| 588 | return 0; |
| 589 | } |
| 590 | |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 591 | static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, |
| 592 | unsigned long nr_segs, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 594 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | struct inode * inode = dentry->d_inode; |
| 596 | ssize_t result; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 597 | size_t count = iov_length(iov, nr_segs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | if (iocb->ki_filp->f_flags & O_DIRECT) |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 600 | return nfs_file_direct_write(iocb, iov, nr_segs, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 602 | dprintk("NFS: write(%s/%s, %lu@%Ld)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | dentry->d_parent->d_name.name, dentry->d_name.name, |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 604 | (unsigned long) count, (long long) pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | |
| 606 | result = -EBUSY; |
| 607 | if (IS_SWAPFILE(inode)) |
| 608 | goto out_swapfile; |
Trond Myklebust | 7d52e86 | 2005-06-22 17:16:30 +0000 | [diff] [blame] | 609 | /* |
| 610 | * O_APPEND implies that we must revalidate the file length. |
| 611 | */ |
| 612 | if (iocb->ki_filp->f_flags & O_APPEND) { |
| 613 | result = nfs_revalidate_file_size(inode, iocb->ki_filp); |
| 614 | if (result) |
| 615 | goto out; |
Trond Myklebust | fe51bee | 2005-06-22 17:16:30 +0000 | [diff] [blame] | 616 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | |
| 618 | result = count; |
| 619 | if (!count) |
| 620 | goto out; |
| 621 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 622 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 623 | result = generic_file_aio_write(iocb, iov, nr_segs, pos); |
Trond Myklebust | 200baa2 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 624 | /* Return error values for O_SYNC and IS_SYNC() */ |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 625 | if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 626 | int err = nfs_do_fsync(nfs_file_open_context(iocb->ki_filp), inode); |
Trond Myklebust | 200baa2 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 627 | if (err < 0) |
| 628 | result = err; |
| 629 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | out: |
| 631 | return result; |
| 632 | |
| 633 | out_swapfile: |
| 634 | printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); |
| 635 | goto out; |
| 636 | } |
| 637 | |
Suresh Jayaraman | bf40d34 | 2009-06-17 18:02:09 -0700 | [diff] [blame] | 638 | static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe, |
| 639 | struct file *filp, loff_t *ppos, |
| 640 | size_t count, unsigned int flags) |
| 641 | { |
| 642 | struct dentry *dentry = filp->f_path.dentry; |
| 643 | struct inode *inode = dentry->d_inode; |
| 644 | ssize_t ret; |
| 645 | |
| 646 | dprintk("NFS splice_write(%s/%s, %lu@%llu)\n", |
| 647 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 648 | (unsigned long) count, (unsigned long long) *ppos); |
| 649 | |
| 650 | /* |
| 651 | * The combination of splice and an O_APPEND destination is disallowed. |
| 652 | */ |
| 653 | |
| 654 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); |
| 655 | |
| 656 | ret = generic_file_splice_write(pipe, filp, ppos, count, flags); |
| 657 | if (ret >= 0 && nfs_need_sync_write(filp, inode)) { |
| 658 | int err = nfs_do_fsync(nfs_file_open_context(filp), inode); |
| 659 | if (err < 0) |
| 660 | ret = err; |
| 661 | } |
| 662 | return ret; |
| 663 | } |
| 664 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | static int do_getlk(struct file *filp, int cmd, struct file_lock *fl) |
| 666 | { |
| 667 | struct inode *inode = filp->f_mapping->host; |
| 668 | int status = 0; |
| 669 | |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 670 | /* Try local locking first */ |
J. Bruce Fields | 6d34ac1 | 2007-05-11 16:09:32 -0400 | [diff] [blame] | 671 | posix_test_lock(filp, fl); |
| 672 | if (fl->fl_type != F_UNLCK) { |
| 673 | /* found a conflict */ |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 674 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | } |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 676 | |
| 677 | if (nfs_have_delegation(inode, FMODE_READ)) |
| 678 | goto out_noconflict; |
| 679 | |
| 680 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) |
| 681 | goto out_noconflict; |
| 682 | |
| 683 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
| 684 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | return status; |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 686 | out_noconflict: |
| 687 | fl->fl_type = F_UNLCK; |
| 688 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | } |
| 690 | |
| 691 | static int do_vfs_lock(struct file *file, struct file_lock *fl) |
| 692 | { |
| 693 | int res = 0; |
| 694 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { |
| 695 | case FL_POSIX: |
| 696 | res = posix_lock_file_wait(file, fl); |
| 697 | break; |
| 698 | case FL_FLOCK: |
| 699 | res = flock_lock_file_wait(file, fl); |
| 700 | break; |
| 701 | default: |
| 702 | BUG(); |
| 703 | } |
| 704 | if (res < 0) |
Neil Brown | 46bae1a | 2007-01-30 14:36:01 -0800 | [diff] [blame] | 705 | dprintk(KERN_WARNING "%s: VFS is out of sync with lock manager" |
| 706 | " - error %d!\n", |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 707 | __func__, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | return res; |
| 709 | } |
| 710 | |
| 711 | static int do_unlk(struct file *filp, int cmd, struct file_lock *fl) |
| 712 | { |
| 713 | struct inode *inode = filp->f_mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | int status; |
| 715 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | /* |
| 717 | * Flush all pending writes before doing anything |
| 718 | * with locks.. |
| 719 | */ |
Trond Myklebust | 29884df | 2005-12-13 16:13:54 -0500 | [diff] [blame] | 720 | nfs_sync_mapping(filp->f_mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | |
| 722 | /* NOTE: special case |
| 723 | * If we're signalled while cleaning up locks on process exit, we |
| 724 | * still need to complete the unlock. |
| 725 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | /* Use local locking if mounted with "-onolock" */ |
| 727 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) |
| 728 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
| 729 | else |
| 730 | status = do_vfs_lock(filp, fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | return status; |
| 732 | } |
| 733 | |
| 734 | static int do_setlk(struct file *filp, int cmd, struct file_lock *fl) |
| 735 | { |
| 736 | struct inode *inode = filp->f_mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | int status; |
| 738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | /* |
| 740 | * Flush all pending writes before doing anything |
| 741 | * with locks.. |
| 742 | */ |
Trond Myklebust | 29884df | 2005-12-13 16:13:54 -0500 | [diff] [blame] | 743 | status = nfs_sync_mapping(filp->f_mapping); |
| 744 | if (status != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | goto out; |
| 746 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | /* Use local locking if mounted with "-onolock" */ |
Trond Myklebust | c4d7c40 | 2008-04-01 20:26:52 -0400 | [diff] [blame] | 748 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
Trond Myklebust | c4d7c40 | 2008-04-01 20:26:52 -0400 | [diff] [blame] | 750 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | status = do_vfs_lock(filp, fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | if (status < 0) |
| 753 | goto out; |
| 754 | /* |
| 755 | * Make sure we clear the cache whenever we try to get the lock. |
| 756 | * This makes locking act as a cache coherency point. |
| 757 | */ |
Trond Myklebust | 29884df | 2005-12-13 16:13:54 -0500 | [diff] [blame] | 758 | nfs_sync_mapping(filp->f_mapping); |
Trond Myklebust | b541838 | 2008-06-10 18:31:02 -0400 | [diff] [blame] | 759 | if (!nfs_have_delegation(inode, FMODE_READ)) |
| 760 | nfs_zap_caches(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | return status; |
| 763 | } |
| 764 | |
| 765 | /* |
| 766 | * Lock a (portion of) a file |
| 767 | */ |
| 768 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) |
| 769 | { |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 770 | struct inode *inode = filp->f_mapping->host; |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 771 | int ret = -ENOLCK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 773 | dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n", |
| 774 | filp->f_path.dentry->d_parent->d_name.name, |
| 775 | filp->f_path.dentry->d_name.name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | fl->fl_type, fl->fl_flags, |
| 777 | (long long)fl->fl_start, (long long)fl->fl_end); |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 778 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 779 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | |
| 781 | /* No mandatory locks over NFS */ |
Pavel Emelyanov | dfad944 | 2007-10-01 14:41:15 -0700 | [diff] [blame] | 782 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 783 | goto out_err; |
| 784 | |
| 785 | if (NFS_PROTO(inode)->lock_check_bounds != NULL) { |
| 786 | ret = NFS_PROTO(inode)->lock_check_bounds(fl); |
| 787 | if (ret < 0) |
| 788 | goto out_err; |
| 789 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | |
| 791 | if (IS_GETLK(cmd)) |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 792 | ret = do_getlk(filp, cmd, fl); |
| 793 | else if (fl->fl_type == F_UNLCK) |
| 794 | ret = do_unlk(filp, cmd, fl); |
| 795 | else |
| 796 | ret = do_setlk(filp, cmd, fl); |
| 797 | out_err: |
| 798 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | } |
| 800 | |
| 801 | /* |
| 802 | * Lock a (portion of) a file |
| 803 | */ |
| 804 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) |
| 805 | { |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 806 | dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n", |
| 807 | filp->f_path.dentry->d_parent->d_name.name, |
| 808 | filp->f_path.dentry->d_name.name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | fl->fl_type, fl->fl_flags); |
| 810 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | if (!(fl->fl_flags & FL_FLOCK)) |
| 812 | return -ENOLCK; |
| 813 | |
| 814 | /* We're simulating flock() locks using posix locks on the server */ |
| 815 | fl->fl_owner = (fl_owner_t)filp; |
| 816 | fl->fl_start = 0; |
| 817 | fl->fl_end = OFFSET_MAX; |
| 818 | |
| 819 | if (fl->fl_type == F_UNLCK) |
| 820 | return do_unlk(filp, cmd, fl); |
| 821 | return do_setlk(filp, cmd, fl); |
| 822 | } |
J. Bruce Fields | 370f659 | 2007-06-08 15:23:34 -0400 | [diff] [blame] | 823 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 824 | /* |
| 825 | * There is no protocol support for leases, so we have no way to implement |
| 826 | * them correctly in the face of opens by other clients. |
| 827 | */ |
J. Bruce Fields | 370f659 | 2007-06-08 15:23:34 -0400 | [diff] [blame] | 828 | static int nfs_setlease(struct file *file, long arg, struct file_lock **fl) |
| 829 | { |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 830 | dprintk("NFS: setlease(%s/%s, arg=%ld)\n", |
| 831 | file->f_path.dentry->d_parent->d_name.name, |
| 832 | file->f_path.dentry->d_name.name, arg); |
| 833 | |
J. Bruce Fields | 370f659 | 2007-06-08 15:23:34 -0400 | [diff] [blame] | 834 | return -EINVAL; |
| 835 | } |