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> |
| 29 | #include <linux/smp_lock.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 30 | #include <linux/aio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | #include <asm/uaccess.h> |
| 33 | #include <asm/system.h> |
| 34 | |
| 35 | #include "delegation.h" |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 36 | #include "internal.h" |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 37 | #include "iostat.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); |
| 50 | static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov, |
| 51 | unsigned long nr_segs, loff_t pos); |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 52 | static int nfs_file_flush(struct file *, fl_owner_t id); |
Chuck Lever | 5491778 | 2008-05-27 16:29:07 -0400 | [diff] [blame] | 53 | static int nfs_file_fsync(struct file *, struct dentry *dentry, int datasync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | static int nfs_check_flags(int flags); |
| 55 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl); |
| 56 | 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] | 57 | 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] | 58 | |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 59 | static struct vm_operations_struct nfs_file_vm_ops; |
| 60 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 61 | const struct file_operations nfs_file_operations = { |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 62 | .llseek = nfs_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | .read = do_sync_read, |
| 64 | .write = do_sync_write, |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 65 | .aio_read = nfs_file_read, |
| 66 | .aio_write = nfs_file_write, |
Bryan Wu | 240ee83 | 2008-04-01 20:23:39 -0700 | [diff] [blame] | 67 | #ifdef CONFIG_MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | .mmap = nfs_file_mmap, |
Bryan Wu | 240ee83 | 2008-04-01 20:23:39 -0700 | [diff] [blame] | 69 | #else |
| 70 | .mmap = generic_file_mmap, |
| 71 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | .open = nfs_file_open, |
| 73 | .flush = nfs_file_flush, |
| 74 | .release = nfs_file_release, |
Chuck Lever | 5491778 | 2008-05-27 16:29:07 -0400 | [diff] [blame] | 75 | .fsync = nfs_file_fsync, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | .lock = nfs_lock, |
| 77 | .flock = nfs_flock, |
Jens Axboe | f0930ff | 2007-06-01 11:51:43 +0200 | [diff] [blame] | 78 | .splice_read = nfs_file_splice_read, |
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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | /* Ensure that dirty pages are flushed out with the right creds */ |
| 145 | if (filp->f_mode & FMODE_WRITE) |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 146 | nfs_wb_all(dentry->d_inode); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 147 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
Trond Myklebust | 46cb650 | 2008-06-11 16:32:46 -0400 | [diff] [blame] | 148 | return nfs_release(inode, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | } |
| 150 | |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 151 | /** |
| 152 | * nfs_revalidate_size - Revalidate the file size |
| 153 | * @inode - pointer to inode struct |
| 154 | * @file - pointer to struct file |
| 155 | * |
| 156 | * Revalidates the file length. This is basically a wrapper around |
| 157 | * nfs_revalidate_inode() that takes into account the fact that we may |
| 158 | * have cached writes (in which case we don't care about the server's |
| 159 | * idea of what the file length is), or O_DIRECT (in which case we |
| 160 | * shouldn't trust the cache). |
| 161 | */ |
| 162 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) |
| 163 | { |
| 164 | struct nfs_server *server = NFS_SERVER(inode); |
| 165 | struct nfs_inode *nfsi = NFS_I(inode); |
| 166 | |
| 167 | if (server->flags & NFS_MOUNT_NOAC) |
| 168 | goto force_reval; |
| 169 | if (filp->f_flags & O_DIRECT) |
| 170 | goto force_reval; |
| 171 | if (nfsi->npages != 0) |
| 172 | return 0; |
Chuck Lever | 5529680 | 2005-08-18 11:24:09 -0700 | [diff] [blame] | 173 | if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode)) |
Trond Myklebust | fe51beec | 2005-06-22 17:16:30 +0000 | [diff] [blame] | 174 | return 0; |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 175 | force_reval: |
| 176 | return __nfs_revalidate_inode(server, inode); |
| 177 | } |
| 178 | |
| 179 | static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) |
| 180 | { |
Andi Kleen | 9465efc | 2008-06-27 11:05:24 +0200 | [diff] [blame] | 181 | loff_t loff; |
Trond Myklebust | e89e896 | 2008-07-15 18:34:16 -0400 | [diff] [blame] | 182 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 183 | dprintk("NFS: llseek file(%s/%s, %lld, %d)\n", |
Chuck Lever | b84e06c | 2008-06-11 17:55:34 -0400 | [diff] [blame] | 184 | filp->f_path.dentry->d_parent->d_name.name, |
| 185 | filp->f_path.dentry->d_name.name, |
| 186 | offset, origin); |
| 187 | |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 188 | /* origin == SEEK_END => we must revalidate the cached file length */ |
Josef 'Jeff' Sipek | aec5e17 | 2006-09-16 21:09:32 -0400 | [diff] [blame] | 189 | if (origin == SEEK_END) { |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 190 | struct inode *inode = filp->f_mapping->host; |
Trond Myklebust | d5e6634 | 2008-09-23 17:28:35 -0400 | [diff] [blame] | 191 | |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 192 | int retval = nfs_revalidate_file_size(inode, filp); |
| 193 | if (retval < 0) |
| 194 | return (loff_t)retval; |
Trond Myklebust | d5e6634 | 2008-09-23 17:28:35 -0400 | [diff] [blame] | 195 | |
| 196 | spin_lock(&inode->i_lock); |
| 197 | loff = generic_file_llseek_unlocked(filp, offset, origin); |
| 198 | spin_unlock(&inode->i_lock); |
| 199 | } else |
| 200 | loff = generic_file_llseek_unlocked(filp, offset, origin); |
Andi Kleen | 9465efc | 2008-06-27 11:05:24 +0200 | [diff] [blame] | 201 | return loff; |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 202 | } |
| 203 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | /* |
Chuck Lever | 5491778 | 2008-05-27 16:29:07 -0400 | [diff] [blame] | 205 | * Helper for nfs_file_flush() and nfs_file_fsync() |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 206 | * |
| 207 | * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to |
| 208 | * disk, but it retrieves and clears ctx->error after synching, despite |
| 209 | * the two being set at the same time in nfs_context_set_write_error(). |
| 210 | * This is because the former is used to notify the _next_ call to |
| 211 | * nfs_file_write() that a write error occured, and hence cause it to |
| 212 | * fall back to doing a synchronous write. |
| 213 | */ |
| 214 | static int nfs_do_fsync(struct nfs_open_context *ctx, struct inode *inode) |
| 215 | { |
| 216 | int have_error, status; |
| 217 | int ret = 0; |
| 218 | |
| 219 | have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); |
| 220 | status = nfs_wb_all(inode); |
| 221 | have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); |
| 222 | if (have_error) |
| 223 | ret = xchg(&ctx->error, 0); |
| 224 | if (!ret) |
| 225 | ret = status; |
| 226 | return ret; |
| 227 | } |
| 228 | |
| 229 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | * Flush all dirty pages, and check for write errors. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | */ |
| 232 | static int |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 233 | nfs_file_flush(struct file *file, fl_owner_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 235 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 236 | struct dentry *dentry = file->f_path.dentry; |
| 237 | struct inode *inode = dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | int status; |
| 239 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 240 | dprintk("NFS: flush(%s/%s)\n", |
| 241 | dentry->d_parent->d_name.name, |
| 242 | dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
| 244 | if ((file->f_mode & FMODE_WRITE) == 0) |
| 245 | return 0; |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 246 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | /* Ensure that data+attribute caches are up to date after close() */ |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 249 | status = nfs_do_fsync(ctx, inode); |
| 250 | if (!status) |
| 251 | nfs_revalidate_inode(NFS_SERVER(inode), inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | return status; |
| 253 | } |
| 254 | |
| 255 | static ssize_t |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 256 | nfs_file_read(struct kiocb *iocb, const struct iovec *iov, |
| 257 | unsigned long nr_segs, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 259 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | struct inode * inode = dentry->d_inode; |
| 261 | ssize_t result; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 262 | size_t count = iov_length(iov, nr_segs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | if (iocb->ki_filp->f_flags & O_DIRECT) |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 265 | return nfs_file_direct_read(iocb, iov, nr_segs, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 267 | dprintk("NFS: read(%s/%s, %lu@%lu)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 269 | (unsigned long) count, (unsigned long) pos); |
| 270 | |
Trond Myklebust | 44b1187 | 2006-05-25 01:40:59 -0400 | [diff] [blame] | 271 | result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 272 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | if (!result) |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 274 | result = generic_file_aio_read(iocb, iov, nr_segs, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | return result; |
| 276 | } |
| 277 | |
| 278 | static ssize_t |
Jens Axboe | f0930ff | 2007-06-01 11:51:43 +0200 | [diff] [blame] | 279 | nfs_file_splice_read(struct file *filp, loff_t *ppos, |
| 280 | struct pipe_inode_info *pipe, size_t count, |
| 281 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 283 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | struct inode *inode = dentry->d_inode; |
| 285 | ssize_t res; |
| 286 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 287 | dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 289 | (unsigned long) count, (unsigned long long) *ppos); |
| 290 | |
Trond Myklebust | 44b1187 | 2006-05-25 01:40:59 -0400 | [diff] [blame] | 291 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | if (!res) |
Jens Axboe | f0930ff | 2007-06-01 11:51:43 +0200 | [diff] [blame] | 293 | res = generic_file_splice_read(filp, ppos, pipe, count, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | return res; |
| 295 | } |
| 296 | |
| 297 | static int |
| 298 | nfs_file_mmap(struct file * file, struct vm_area_struct * vma) |
| 299 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 300 | struct dentry *dentry = file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | struct inode *inode = dentry->d_inode; |
| 302 | int status; |
| 303 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 304 | dprintk("NFS: mmap(%s/%s)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 306 | |
Trond Myklebust | 44b1187 | 2006-05-25 01:40:59 -0400 | [diff] [blame] | 307 | status = nfs_revalidate_mapping(inode, file->f_mapping); |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 308 | if (!status) { |
| 309 | vma->vm_ops = &nfs_file_vm_ops; |
| 310 | vma->vm_flags |= VM_CAN_NONLINEAR; |
| 311 | file_accessed(file); |
| 312 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | return status; |
| 314 | } |
| 315 | |
| 316 | /* |
| 317 | * Flush any dirty pages for this process, and check for write errors. |
| 318 | * The return status from this call provides a reliable indication of |
| 319 | * whether any write errors occurred for this process. |
| 320 | */ |
| 321 | static int |
Chuck Lever | 5491778 | 2008-05-27 16:29:07 -0400 | [diff] [blame] | 322 | nfs_file_fsync(struct file *file, struct dentry *dentry, int datasync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 324 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | struct inode *inode = dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 327 | dprintk("NFS: fsync file(%s/%s) datasync %d\n", |
Chuck Lever | 5491778 | 2008-05-27 16:29:07 -0400 | [diff] [blame] | 328 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 329 | datasync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 331 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 332 | return nfs_do_fsync(ctx, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | } |
| 334 | |
| 335 | /* |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 336 | * This does the "real" work of the write. We must allocate and lock the |
| 337 | * page to be sent back to the generic routine, which then copies the |
| 338 | * data from user space. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | * |
| 340 | * If the writer ends up delaying the write, the writer needs to |
| 341 | * increment the page use counts until he is done with the page. |
| 342 | */ |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 343 | static int nfs_write_begin(struct file *file, struct address_space *mapping, |
| 344 | loff_t pos, unsigned len, unsigned flags, |
| 345 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | { |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 347 | int ret; |
| 348 | pgoff_t index; |
| 349 | struct page *page; |
| 350 | index = pos >> PAGE_CACHE_SHIFT; |
| 351 | |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 352 | dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n", |
| 353 | file->f_path.dentry->d_parent->d_name.name, |
| 354 | file->f_path.dentry->d_name.name, |
| 355 | mapping->host->i_ino, len, (long long) pos); |
| 356 | |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 357 | page = __grab_cache_page(mapping, index); |
| 358 | if (!page) |
| 359 | return -ENOMEM; |
| 360 | *pagep = page; |
| 361 | |
| 362 | ret = nfs_flush_incompatible(file, page); |
| 363 | if (ret) { |
| 364 | unlock_page(page); |
| 365 | page_cache_release(page); |
| 366 | } |
| 367 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | } |
| 369 | |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 370 | static int nfs_write_end(struct file *file, struct address_space *mapping, |
| 371 | loff_t pos, unsigned len, unsigned copied, |
| 372 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | { |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 374 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
| 375 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 377 | dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n", |
| 378 | file->f_path.dentry->d_parent->d_name.name, |
| 379 | file->f_path.dentry->d_name.name, |
| 380 | mapping->host->i_ino, len, (long long) pos); |
| 381 | |
Trond Myklebust | efc91ed | 2008-06-10 18:31:00 -0400 | [diff] [blame] | 382 | /* |
| 383 | * Zero any uninitialised parts of the page, and then mark the page |
| 384 | * as up to date if it turns out that we're extending the file. |
| 385 | */ |
| 386 | if (!PageUptodate(page)) { |
| 387 | unsigned pglen = nfs_page_length(page); |
| 388 | unsigned end = offset + len; |
| 389 | |
| 390 | if (pglen == 0) { |
| 391 | zero_user_segments(page, 0, offset, |
| 392 | end, PAGE_CACHE_SIZE); |
| 393 | SetPageUptodate(page); |
| 394 | } else if (end >= pglen) { |
| 395 | zero_user_segment(page, end, PAGE_CACHE_SIZE); |
| 396 | if (offset == 0) |
| 397 | SetPageUptodate(page); |
| 398 | } else |
| 399 | zero_user_segment(page, pglen, PAGE_CACHE_SIZE); |
| 400 | } |
| 401 | |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 402 | status = nfs_updatepage(file, page, offset, copied); |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 403 | |
| 404 | unlock_page(page); |
| 405 | page_cache_release(page); |
| 406 | |
Chuck Lever | 3d509e5 | 2007-12-20 14:55:04 -0500 | [diff] [blame] | 407 | if (status < 0) |
| 408 | return status; |
| 409 | return copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | } |
| 411 | |
NeilBrown | 2ff28e2 | 2006-03-26 01:37:18 -0800 | [diff] [blame] | 412 | static void nfs_invalidate_page(struct page *page, unsigned long offset) |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 413 | { |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 414 | dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset); |
| 415 | |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 416 | if (offset != 0) |
| 417 | return; |
Trond Myklebust | d2ccddf | 2006-05-31 01:13:38 -0400 | [diff] [blame] | 418 | /* Cancel any unstarted writes on this page */ |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 419 | nfs_wb_page_cancel(page->mapping->host, page); |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 420 | } |
| 421 | |
| 422 | static int nfs_release_page(struct page *page, gfp_t gfp) |
| 423 | { |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 424 | dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page); |
| 425 | |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 426 | /* If PagePrivate() is set, then the page is not freeable */ |
| 427 | return 0; |
| 428 | } |
| 429 | |
| 430 | static int nfs_launder_page(struct page *page) |
| 431 | { |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 432 | struct inode *inode = page->mapping->host; |
| 433 | |
| 434 | dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n", |
| 435 | inode->i_ino, (long long)page_offset(page)); |
| 436 | |
| 437 | return nfs_wb_page(inode, page); |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 438 | } |
| 439 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 440 | const struct address_space_operations nfs_file_aops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | .readpage = nfs_readpage, |
| 442 | .readpages = nfs_readpages, |
Trond Myklebust | 9cccef9 | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 443 | .set_page_dirty = __set_page_dirty_nobuffers, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | .writepage = nfs_writepage, |
| 445 | .writepages = nfs_writepages, |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 446 | .write_begin = nfs_write_begin, |
| 447 | .write_end = nfs_write_end, |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 448 | .invalidatepage = nfs_invalidate_page, |
| 449 | .releasepage = nfs_release_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | .direct_IO = nfs_direct_IO, |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 451 | .launder_page = nfs_launder_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | }; |
| 453 | |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 454 | static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct page *page) |
| 455 | { |
| 456 | struct file *filp = vma->vm_file; |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 457 | struct dentry *dentry = filp->f_path.dentry; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 458 | unsigned pagelen; |
| 459 | int ret = -EINVAL; |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 460 | struct address_space *mapping; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 461 | |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 462 | dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n", |
| 463 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 464 | filp->f_mapping->host->i_ino, |
| 465 | (long long)page_offset(page)); |
| 466 | |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 467 | lock_page(page); |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 468 | mapping = page->mapping; |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 469 | if (mapping != dentry->d_inode->i_mapping) |
Trond Myklebust | 8b1f9ee | 2008-01-22 17:13:06 -0500 | [diff] [blame] | 470 | goto out_unlock; |
| 471 | |
| 472 | ret = 0; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 473 | pagelen = nfs_page_length(page); |
Trond Myklebust | 8b1f9ee | 2008-01-22 17:13:06 -0500 | [diff] [blame] | 474 | if (pagelen == 0) |
| 475 | goto out_unlock; |
| 476 | |
| 477 | ret = nfs_flush_incompatible(filp, page); |
| 478 | if (ret != 0) |
| 479 | goto out_unlock; |
| 480 | |
| 481 | ret = nfs_updatepage(filp, page, 0, pagelen); |
| 482 | if (ret == 0) |
| 483 | ret = pagelen; |
| 484 | out_unlock: |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 485 | unlock_page(page); |
| 486 | return ret; |
| 487 | } |
| 488 | |
| 489 | static struct vm_operations_struct nfs_file_vm_ops = { |
| 490 | .fault = filemap_fault, |
| 491 | .page_mkwrite = nfs_vm_page_mkwrite, |
| 492 | }; |
| 493 | |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 494 | static int nfs_need_sync_write(struct file *filp, struct inode *inode) |
| 495 | { |
| 496 | struct nfs_open_context *ctx; |
| 497 | |
| 498 | if (IS_SYNC(inode) || (filp->f_flags & O_SYNC)) |
| 499 | return 1; |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 500 | ctx = nfs_file_open_context(filp); |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 501 | if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags)) |
| 502 | return 1; |
| 503 | return 0; |
| 504 | } |
| 505 | |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 506 | static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, |
| 507 | unsigned long nr_segs, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 509 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | struct inode * inode = dentry->d_inode; |
| 511 | ssize_t result; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 512 | size_t count = iov_length(iov, nr_segs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | if (iocb->ki_filp->f_flags & O_DIRECT) |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 515 | return nfs_file_direct_write(iocb, iov, nr_segs, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 517 | dprintk("NFS: write(%s/%s, %lu@%Ld)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | dentry->d_parent->d_name.name, dentry->d_name.name, |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 519 | (unsigned long) count, (long long) pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | |
| 521 | result = -EBUSY; |
| 522 | if (IS_SWAPFILE(inode)) |
| 523 | goto out_swapfile; |
Trond Myklebust | 7d52e86 | 2005-06-22 17:16:30 +0000 | [diff] [blame] | 524 | /* |
| 525 | * O_APPEND implies that we must revalidate the file length. |
| 526 | */ |
| 527 | if (iocb->ki_filp->f_flags & O_APPEND) { |
| 528 | result = nfs_revalidate_file_size(inode, iocb->ki_filp); |
| 529 | if (result) |
| 530 | goto out; |
Trond Myklebust | fe51beec | 2005-06-22 17:16:30 +0000 | [diff] [blame] | 531 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | |
| 533 | result = count; |
| 534 | if (!count) |
| 535 | goto out; |
| 536 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 537 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 538 | result = generic_file_aio_write(iocb, iov, nr_segs, pos); |
Trond Myklebust | 200baa2 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 539 | /* Return error values for O_SYNC and IS_SYNC() */ |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 540 | if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 541 | 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] | 542 | if (err < 0) |
| 543 | result = err; |
| 544 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | out: |
| 546 | return result; |
| 547 | |
| 548 | out_swapfile: |
| 549 | printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); |
| 550 | goto out; |
| 551 | } |
| 552 | |
| 553 | static int do_getlk(struct file *filp, int cmd, struct file_lock *fl) |
| 554 | { |
| 555 | struct inode *inode = filp->f_mapping->host; |
| 556 | int status = 0; |
| 557 | |
| 558 | lock_kernel(); |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 559 | /* Try local locking first */ |
J. Bruce Fields | 6d34ac1 | 2007-05-11 16:09:32 -0400 | [diff] [blame] | 560 | posix_test_lock(filp, fl); |
| 561 | if (fl->fl_type != F_UNLCK) { |
| 562 | /* found a conflict */ |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 563 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | } |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 565 | |
| 566 | if (nfs_have_delegation(inode, FMODE_READ)) |
| 567 | goto out_noconflict; |
| 568 | |
| 569 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) |
| 570 | goto out_noconflict; |
| 571 | |
| 572 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
| 573 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | unlock_kernel(); |
| 575 | return status; |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 576 | out_noconflict: |
| 577 | fl->fl_type = F_UNLCK; |
| 578 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | } |
| 580 | |
| 581 | static int do_vfs_lock(struct file *file, struct file_lock *fl) |
| 582 | { |
| 583 | int res = 0; |
| 584 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { |
| 585 | case FL_POSIX: |
| 586 | res = posix_lock_file_wait(file, fl); |
| 587 | break; |
| 588 | case FL_FLOCK: |
| 589 | res = flock_lock_file_wait(file, fl); |
| 590 | break; |
| 591 | default: |
| 592 | BUG(); |
| 593 | } |
| 594 | if (res < 0) |
Neil Brown | 46bae1a | 2007-01-30 14:36:01 -0800 | [diff] [blame] | 595 | dprintk(KERN_WARNING "%s: VFS is out of sync with lock manager" |
| 596 | " - error %d!\n", |
Harvey Harrison | 3110ff8 | 2008-05-02 13:42:44 -0700 | [diff] [blame] | 597 | __func__, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | return res; |
| 599 | } |
| 600 | |
| 601 | static int do_unlk(struct file *filp, int cmd, struct file_lock *fl) |
| 602 | { |
| 603 | struct inode *inode = filp->f_mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | int status; |
| 605 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | /* |
| 607 | * Flush all pending writes before doing anything |
| 608 | * with locks.. |
| 609 | */ |
Trond Myklebust | 29884df | 2005-12-13 16:13:54 -0500 | [diff] [blame] | 610 | nfs_sync_mapping(filp->f_mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
| 612 | /* NOTE: special case |
| 613 | * If we're signalled while cleaning up locks on process exit, we |
| 614 | * still need to complete the unlock. |
| 615 | */ |
| 616 | lock_kernel(); |
| 617 | /* Use local locking if mounted with "-onolock" */ |
| 618 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) |
| 619 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
| 620 | else |
| 621 | status = do_vfs_lock(filp, fl); |
| 622 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | return status; |
| 624 | } |
| 625 | |
| 626 | static int do_setlk(struct file *filp, int cmd, struct file_lock *fl) |
| 627 | { |
| 628 | struct inode *inode = filp->f_mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | int status; |
| 630 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | /* |
| 632 | * Flush all pending writes before doing anything |
| 633 | * with locks.. |
| 634 | */ |
Trond Myklebust | 29884df | 2005-12-13 16:13:54 -0500 | [diff] [blame] | 635 | status = nfs_sync_mapping(filp->f_mapping); |
| 636 | if (status != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | goto out; |
| 638 | |
| 639 | lock_kernel(); |
| 640 | /* Use local locking if mounted with "-onolock" */ |
Trond Myklebust | c4d7c40 | 2008-04-01 20:26:52 -0400 | [diff] [blame] | 641 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
Trond Myklebust | c4d7c40 | 2008-04-01 20:26:52 -0400 | [diff] [blame] | 643 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | status = do_vfs_lock(filp, fl); |
| 645 | unlock_kernel(); |
| 646 | if (status < 0) |
| 647 | goto out; |
| 648 | /* |
| 649 | * Make sure we clear the cache whenever we try to get the lock. |
| 650 | * This makes locking act as a cache coherency point. |
| 651 | */ |
Trond Myklebust | 29884df | 2005-12-13 16:13:54 -0500 | [diff] [blame] | 652 | nfs_sync_mapping(filp->f_mapping); |
Trond Myklebust | b541838 | 2008-06-10 18:31:02 -0400 | [diff] [blame] | 653 | if (!nfs_have_delegation(inode, FMODE_READ)) |
| 654 | nfs_zap_caches(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | return status; |
| 657 | } |
| 658 | |
| 659 | /* |
| 660 | * Lock a (portion of) a file |
| 661 | */ |
| 662 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) |
| 663 | { |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 664 | struct inode *inode = filp->f_mapping->host; |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 665 | int ret = -ENOLCK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 667 | dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n", |
| 668 | filp->f_path.dentry->d_parent->d_name.name, |
| 669 | filp->f_path.dentry->d_name.name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | fl->fl_type, fl->fl_flags, |
| 671 | (long long)fl->fl_start, (long long)fl->fl_end); |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 672 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 673 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | |
| 675 | /* No mandatory locks over NFS */ |
Pavel Emelyanov | dfad944 | 2007-10-01 14:41:15 -0700 | [diff] [blame] | 676 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 677 | goto out_err; |
| 678 | |
| 679 | if (NFS_PROTO(inode)->lock_check_bounds != NULL) { |
| 680 | ret = NFS_PROTO(inode)->lock_check_bounds(fl); |
| 681 | if (ret < 0) |
| 682 | goto out_err; |
| 683 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
| 685 | if (IS_GETLK(cmd)) |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 686 | ret = do_getlk(filp, cmd, fl); |
| 687 | else if (fl->fl_type == F_UNLCK) |
| 688 | ret = do_unlk(filp, cmd, fl); |
| 689 | else |
| 690 | ret = do_setlk(filp, cmd, fl); |
| 691 | out_err: |
| 692 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | } |
| 694 | |
| 695 | /* |
| 696 | * Lock a (portion of) a file |
| 697 | */ |
| 698 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) |
| 699 | { |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 700 | dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n", |
| 701 | filp->f_path.dentry->d_parent->d_name.name, |
| 702 | filp->f_path.dentry->d_name.name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | fl->fl_type, fl->fl_flags); |
| 704 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | if (!(fl->fl_flags & FL_FLOCK)) |
| 706 | return -ENOLCK; |
| 707 | |
| 708 | /* We're simulating flock() locks using posix locks on the server */ |
| 709 | fl->fl_owner = (fl_owner_t)filp; |
| 710 | fl->fl_start = 0; |
| 711 | fl->fl_end = OFFSET_MAX; |
| 712 | |
| 713 | if (fl->fl_type == F_UNLCK) |
| 714 | return do_unlk(filp, cmd, fl); |
| 715 | return do_setlk(filp, cmd, fl); |
| 716 | } |
J. Bruce Fields | 370f659 | 2007-06-08 15:23:34 -0400 | [diff] [blame] | 717 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 718 | /* |
| 719 | * There is no protocol support for leases, so we have no way to implement |
| 720 | * them correctly in the face of opens by other clients. |
| 721 | */ |
J. Bruce Fields | 370f659 | 2007-06-08 15:23:34 -0400 | [diff] [blame] | 722 | static int nfs_setlease(struct file *file, long arg, struct file_lock **fl) |
| 723 | { |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 724 | dprintk("NFS: setlease(%s/%s, arg=%ld)\n", |
| 725 | file->f_path.dentry->d_parent->d_name.name, |
| 726 | file->f_path.dentry->d_name.name, arg); |
| 727 | |
J. Bruce Fields | 370f659 | 2007-06-08 15:23:34 -0400 | [diff] [blame] | 728 | return -EINVAL; |
| 729 | } |