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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | static int nfs_fsync(struct file *, struct dentry *dentry, int datasync); |
| 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, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | .mmap = nfs_file_mmap, |
| 68 | .open = nfs_file_open, |
| 69 | .flush = nfs_file_flush, |
| 70 | .release = nfs_file_release, |
| 71 | .fsync = nfs_fsync, |
| 72 | .lock = nfs_lock, |
| 73 | .flock = nfs_flock, |
Jens Axboe | f0930ff | 2007-06-01 11:51:43 +0200 | [diff] [blame] | 74 | .splice_read = nfs_file_splice_read, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | .check_flags = nfs_check_flags, |
J. Bruce Fields | 370f659 | 2007-06-08 15:23:34 -0400 | [diff] [blame] | 76 | .setlease = nfs_setlease, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | }; |
| 78 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 79 | const struct inode_operations nfs_file_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | .permission = nfs_permission, |
| 81 | .getattr = nfs_getattr, |
| 82 | .setattr = nfs_setattr, |
| 83 | }; |
| 84 | |
Andreas Gruenbacher | b7fa055 | 2005-06-22 17:16:27 +0000 | [diff] [blame] | 85 | #ifdef CONFIG_NFS_V3 |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 86 | const struct inode_operations nfs3_file_inode_operations = { |
Andreas Gruenbacher | b7fa055 | 2005-06-22 17:16:27 +0000 | [diff] [blame] | 87 | .permission = nfs_permission, |
| 88 | .getattr = nfs_getattr, |
| 89 | .setattr = nfs_setattr, |
| 90 | .listxattr = nfs3_listxattr, |
| 91 | .getxattr = nfs3_getxattr, |
| 92 | .setxattr = nfs3_setxattr, |
| 93 | .removexattr = nfs3_removexattr, |
| 94 | }; |
| 95 | #endif /* CONFIG_NFS_v3 */ |
| 96 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | /* Hack for future NFS swap support */ |
| 98 | #ifndef IS_SWAPFILE |
| 99 | # define IS_SWAPFILE(inode) (0) |
| 100 | #endif |
| 101 | |
| 102 | static int nfs_check_flags(int flags) |
| 103 | { |
| 104 | if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) |
| 105 | return -EINVAL; |
| 106 | |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | /* |
| 111 | * Open file |
| 112 | */ |
| 113 | static int |
| 114 | nfs_file_open(struct inode *inode, struct file *filp) |
| 115 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | int res; |
| 117 | |
| 118 | res = nfs_check_flags(filp->f_flags); |
| 119 | if (res) |
| 120 | return res; |
| 121 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 122 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | lock_kernel(); |
David Howells | 1f16341 | 2006-08-22 20:06:11 -0400 | [diff] [blame] | 124 | res = NFS_PROTO(inode)->file_open(inode, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | unlock_kernel(); |
| 126 | return res; |
| 127 | } |
| 128 | |
| 129 | static int |
| 130 | nfs_file_release(struct inode *inode, struct file *filp) |
| 131 | { |
| 132 | /* Ensure that dirty pages are flushed out with the right creds */ |
| 133 | if (filp->f_mode & FMODE_WRITE) |
Trond Myklebust | a49c3c7 | 2007-10-18 18:03:27 -0400 | [diff] [blame] | 134 | nfs_wb_all(filp->f_path.dentry->d_inode); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 135 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | return NFS_PROTO(inode)->file_release(inode, filp); |
| 137 | } |
| 138 | |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 139 | /** |
| 140 | * nfs_revalidate_size - Revalidate the file size |
| 141 | * @inode - pointer to inode struct |
| 142 | * @file - pointer to struct file |
| 143 | * |
| 144 | * Revalidates the file length. This is basically a wrapper around |
| 145 | * nfs_revalidate_inode() that takes into account the fact that we may |
| 146 | * have cached writes (in which case we don't care about the server's |
| 147 | * idea of what the file length is), or O_DIRECT (in which case we |
| 148 | * shouldn't trust the cache). |
| 149 | */ |
| 150 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) |
| 151 | { |
| 152 | struct nfs_server *server = NFS_SERVER(inode); |
| 153 | struct nfs_inode *nfsi = NFS_I(inode); |
| 154 | |
| 155 | if (server->flags & NFS_MOUNT_NOAC) |
| 156 | goto force_reval; |
| 157 | if (filp->f_flags & O_DIRECT) |
| 158 | goto force_reval; |
| 159 | if (nfsi->npages != 0) |
| 160 | return 0; |
Chuck Lever | 5529680 | 2005-08-18 11:24:09 -0700 | [diff] [blame] | 161 | if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode)) |
Trond Myklebust | fe51bee | 2005-06-22 17:16:30 +0000 | [diff] [blame] | 162 | return 0; |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 163 | force_reval: |
| 164 | return __nfs_revalidate_inode(server, inode); |
| 165 | } |
| 166 | |
| 167 | static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) |
| 168 | { |
| 169 | /* origin == SEEK_END => we must revalidate the cached file length */ |
Josef 'Jeff' Sipek | aec5e17 | 2006-09-16 21:09:32 -0400 | [diff] [blame] | 170 | if (origin == SEEK_END) { |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 171 | struct inode *inode = filp->f_mapping->host; |
| 172 | int retval = nfs_revalidate_file_size(inode, filp); |
| 173 | if (retval < 0) |
| 174 | return (loff_t)retval; |
| 175 | } |
| 176 | return remote_llseek(filp, offset, origin); |
| 177 | } |
| 178 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | /* |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 180 | * Helper for nfs_file_flush() and nfs_fsync() |
| 181 | * |
| 182 | * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to |
| 183 | * disk, but it retrieves and clears ctx->error after synching, despite |
| 184 | * the two being set at the same time in nfs_context_set_write_error(). |
| 185 | * This is because the former is used to notify the _next_ call to |
| 186 | * nfs_file_write() that a write error occured, and hence cause it to |
| 187 | * fall back to doing a synchronous write. |
| 188 | */ |
| 189 | static int nfs_do_fsync(struct nfs_open_context *ctx, struct inode *inode) |
| 190 | { |
| 191 | int have_error, status; |
| 192 | int ret = 0; |
| 193 | |
| 194 | have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); |
| 195 | status = nfs_wb_all(inode); |
| 196 | have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); |
| 197 | if (have_error) |
| 198 | ret = xchg(&ctx->error, 0); |
| 199 | if (!ret) |
| 200 | ret = status; |
| 201 | return ret; |
| 202 | } |
| 203 | |
| 204 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | * Flush all dirty pages, and check for write errors. |
| 206 | * |
| 207 | */ |
| 208 | static int |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 209 | nfs_file_flush(struct file *file, fl_owner_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 211 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 212 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | int status; |
| 214 | |
| 215 | dfprintk(VFS, "nfs: flush(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); |
| 216 | |
| 217 | if ((file->f_mode & FMODE_WRITE) == 0) |
| 218 | return 0; |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 219 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 220 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | /* Ensure that data+attribute caches are up to date after close() */ |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 222 | status = nfs_do_fsync(ctx, inode); |
| 223 | if (!status) |
| 224 | nfs_revalidate_inode(NFS_SERVER(inode), inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | return status; |
| 226 | } |
| 227 | |
| 228 | static ssize_t |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 229 | nfs_file_read(struct kiocb *iocb, const struct iovec *iov, |
| 230 | unsigned long nr_segs, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 232 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | struct inode * inode = dentry->d_inode; |
| 234 | ssize_t result; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 235 | size_t count = iov_length(iov, nr_segs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | |
| 237 | #ifdef CONFIG_NFS_DIRECTIO |
| 238 | if (iocb->ki_filp->f_flags & O_DIRECT) |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 239 | return nfs_file_direct_read(iocb, iov, nr_segs, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | #endif |
| 241 | |
| 242 | dfprintk(VFS, "nfs: read(%s/%s, %lu@%lu)\n", |
| 243 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 244 | (unsigned long) count, (unsigned long) pos); |
| 245 | |
Trond Myklebust | 44b1187 | 2006-05-25 01:40:59 -0400 | [diff] [blame] | 246 | result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 247 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | if (!result) |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 249 | result = generic_file_aio_read(iocb, iov, nr_segs, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | return result; |
| 251 | } |
| 252 | |
| 253 | static ssize_t |
Jens Axboe | f0930ff | 2007-06-01 11:51:43 +0200 | [diff] [blame] | 254 | nfs_file_splice_read(struct file *filp, loff_t *ppos, |
| 255 | struct pipe_inode_info *pipe, size_t count, |
| 256 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 258 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | struct inode *inode = dentry->d_inode; |
| 260 | ssize_t res; |
| 261 | |
Jens Axboe | f0930ff | 2007-06-01 11:51:43 +0200 | [diff] [blame] | 262 | dfprintk(VFS, "nfs: splice_read(%s/%s, %lu@%Lu)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 264 | (unsigned long) count, (unsigned long long) *ppos); |
| 265 | |
Trond Myklebust | 44b1187 | 2006-05-25 01:40:59 -0400 | [diff] [blame] | 266 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | if (!res) |
Jens Axboe | f0930ff | 2007-06-01 11:51:43 +0200 | [diff] [blame] | 268 | res = generic_file_splice_read(filp, ppos, pipe, count, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | return res; |
| 270 | } |
| 271 | |
| 272 | static int |
| 273 | nfs_file_mmap(struct file * file, struct vm_area_struct * vma) |
| 274 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 275 | struct dentry *dentry = file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | struct inode *inode = dentry->d_inode; |
| 277 | int status; |
| 278 | |
| 279 | dfprintk(VFS, "nfs: mmap(%s/%s)\n", |
| 280 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 281 | |
Trond Myklebust | 44b1187 | 2006-05-25 01:40:59 -0400 | [diff] [blame] | 282 | status = nfs_revalidate_mapping(inode, file->f_mapping); |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 283 | if (!status) { |
| 284 | vma->vm_ops = &nfs_file_vm_ops; |
| 285 | vma->vm_flags |= VM_CAN_NONLINEAR; |
| 286 | file_accessed(file); |
| 287 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | return status; |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * Flush any dirty pages for this process, and check for write errors. |
| 293 | * The return status from this call provides a reliable indication of |
| 294 | * whether any write errors occurred for this process. |
| 295 | */ |
| 296 | static int |
| 297 | nfs_fsync(struct file *file, struct dentry *dentry, int datasync) |
| 298 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 299 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | struct inode *inode = dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
| 302 | dfprintk(VFS, "nfs: fsync(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); |
| 303 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 304 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 305 | return nfs_do_fsync(ctx, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | } |
| 307 | |
| 308 | /* |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 309 | * This does the "real" work of the write. We must allocate and lock the |
| 310 | * page to be sent back to the generic routine, which then copies the |
| 311 | * data from user space. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | * |
| 313 | * If the writer ends up delaying the write, the writer needs to |
| 314 | * increment the page use counts until he is done with the page. |
| 315 | */ |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 316 | static int nfs_write_begin(struct file *file, struct address_space *mapping, |
| 317 | loff_t pos, unsigned len, unsigned flags, |
| 318 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | { |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 320 | int ret; |
| 321 | pgoff_t index; |
| 322 | struct page *page; |
| 323 | index = pos >> PAGE_CACHE_SHIFT; |
| 324 | |
| 325 | page = __grab_cache_page(mapping, index); |
| 326 | if (!page) |
| 327 | return -ENOMEM; |
| 328 | *pagep = page; |
| 329 | |
| 330 | ret = nfs_flush_incompatible(file, page); |
| 331 | if (ret) { |
| 332 | unlock_page(page); |
| 333 | page_cache_release(page); |
| 334 | } |
| 335 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | } |
| 337 | |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 338 | static int nfs_write_end(struct file *file, struct address_space *mapping, |
| 339 | loff_t pos, unsigned len, unsigned copied, |
| 340 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | { |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 342 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
| 343 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | |
| 345 | lock_kernel(); |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 346 | status = nfs_updatepage(file, page, offset, copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | unlock_kernel(); |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 348 | |
| 349 | unlock_page(page); |
| 350 | page_cache_release(page); |
| 351 | |
Chuck Lever | 3d509e5 | 2007-12-20 14:55:04 -0500 | [diff] [blame] | 352 | if (status < 0) |
| 353 | return status; |
| 354 | return copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | } |
| 356 | |
NeilBrown | 2ff28e2 | 2006-03-26 01:37:18 -0800 | [diff] [blame] | 357 | static void nfs_invalidate_page(struct page *page, unsigned long offset) |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 358 | { |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 359 | if (offset != 0) |
| 360 | return; |
Trond Myklebust | d2ccddf | 2006-05-31 01:13:38 -0400 | [diff] [blame] | 361 | /* Cancel any unstarted writes on this page */ |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 362 | nfs_wb_page_cancel(page->mapping->host, page); |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 363 | } |
| 364 | |
| 365 | static int nfs_release_page(struct page *page, gfp_t gfp) |
| 366 | { |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 367 | /* If PagePrivate() is set, then the page is not freeable */ |
| 368 | return 0; |
| 369 | } |
| 370 | |
| 371 | static int nfs_launder_page(struct page *page) |
| 372 | { |
| 373 | return nfs_wb_page(page->mapping->host, page); |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 374 | } |
| 375 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 376 | const struct address_space_operations nfs_file_aops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | .readpage = nfs_readpage, |
| 378 | .readpages = nfs_readpages, |
Trond Myklebust | 9cccef9 | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 379 | .set_page_dirty = __set_page_dirty_nobuffers, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | .writepage = nfs_writepage, |
| 381 | .writepages = nfs_writepages, |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 382 | .write_begin = nfs_write_begin, |
| 383 | .write_end = nfs_write_end, |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 384 | .invalidatepage = nfs_invalidate_page, |
| 385 | .releasepage = nfs_release_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | #ifdef CONFIG_NFS_DIRECTIO |
| 387 | .direct_IO = nfs_direct_IO, |
| 388 | #endif |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 389 | .launder_page = nfs_launder_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | }; |
| 391 | |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 392 | static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct page *page) |
| 393 | { |
| 394 | struct file *filp = vma->vm_file; |
| 395 | unsigned pagelen; |
| 396 | int ret = -EINVAL; |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 397 | struct address_space *mapping; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 398 | |
| 399 | lock_page(page); |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 400 | mapping = page->mapping; |
Trond Myklebust | 8b1f9ee | 2008-01-22 17:13:06 -0500 | [diff] [blame] | 401 | if (mapping != vma->vm_file->f_path.dentry->d_inode->i_mapping) |
| 402 | goto out_unlock; |
| 403 | |
| 404 | ret = 0; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 405 | pagelen = nfs_page_length(page); |
Trond Myklebust | 8b1f9ee | 2008-01-22 17:13:06 -0500 | [diff] [blame] | 406 | if (pagelen == 0) |
| 407 | goto out_unlock; |
| 408 | |
| 409 | ret = nfs_flush_incompatible(filp, page); |
| 410 | if (ret != 0) |
| 411 | goto out_unlock; |
| 412 | |
| 413 | ret = nfs_updatepage(filp, page, 0, pagelen); |
| 414 | if (ret == 0) |
| 415 | ret = pagelen; |
| 416 | out_unlock: |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 417 | unlock_page(page); |
| 418 | return ret; |
| 419 | } |
| 420 | |
| 421 | static struct vm_operations_struct nfs_file_vm_ops = { |
| 422 | .fault = filemap_fault, |
| 423 | .page_mkwrite = nfs_vm_page_mkwrite, |
| 424 | }; |
| 425 | |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 426 | static int nfs_need_sync_write(struct file *filp, struct inode *inode) |
| 427 | { |
| 428 | struct nfs_open_context *ctx; |
| 429 | |
| 430 | if (IS_SYNC(inode) || (filp->f_flags & O_SYNC)) |
| 431 | return 1; |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 432 | ctx = nfs_file_open_context(filp); |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 433 | if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags)) |
| 434 | return 1; |
| 435 | return 0; |
| 436 | } |
| 437 | |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 438 | static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, |
| 439 | unsigned long nr_segs, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 441 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | struct inode * inode = dentry->d_inode; |
| 443 | ssize_t result; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 444 | size_t count = iov_length(iov, nr_segs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
| 446 | #ifdef CONFIG_NFS_DIRECTIO |
| 447 | if (iocb->ki_filp->f_flags & O_DIRECT) |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 448 | return nfs_file_direct_write(iocb, iov, nr_segs, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | #endif |
| 450 | |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 451 | dfprintk(VFS, "nfs: write(%s/%s(%ld), %lu@%Ld)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | dentry->d_parent->d_name.name, dentry->d_name.name, |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 453 | inode->i_ino, (unsigned long) count, (long long) pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
| 455 | result = -EBUSY; |
| 456 | if (IS_SWAPFILE(inode)) |
| 457 | goto out_swapfile; |
Trond Myklebust | 7d52e86 | 2005-06-22 17:16:30 +0000 | [diff] [blame] | 458 | /* |
| 459 | * O_APPEND implies that we must revalidate the file length. |
| 460 | */ |
| 461 | if (iocb->ki_filp->f_flags & O_APPEND) { |
| 462 | result = nfs_revalidate_file_size(inode, iocb->ki_filp); |
| 463 | if (result) |
| 464 | goto out; |
Trond Myklebust | fe51bee | 2005-06-22 17:16:30 +0000 | [diff] [blame] | 465 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
| 467 | result = count; |
| 468 | if (!count) |
| 469 | goto out; |
| 470 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 471 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 472 | result = generic_file_aio_write(iocb, iov, nr_segs, pos); |
Trond Myklebust | 200baa2 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 473 | /* Return error values for O_SYNC and IS_SYNC() */ |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 474 | if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 475 | 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] | 476 | if (err < 0) |
| 477 | result = err; |
| 478 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | out: |
| 480 | return result; |
| 481 | |
| 482 | out_swapfile: |
| 483 | printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); |
| 484 | goto out; |
| 485 | } |
| 486 | |
| 487 | static int do_getlk(struct file *filp, int cmd, struct file_lock *fl) |
| 488 | { |
| 489 | struct inode *inode = filp->f_mapping->host; |
| 490 | int status = 0; |
| 491 | |
| 492 | lock_kernel(); |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 493 | /* Try local locking first */ |
J. Bruce Fields | 6d34ac1 | 2007-05-11 16:09:32 -0400 | [diff] [blame] | 494 | posix_test_lock(filp, fl); |
| 495 | if (fl->fl_type != F_UNLCK) { |
| 496 | /* found a conflict */ |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 497 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | } |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 499 | |
| 500 | if (nfs_have_delegation(inode, FMODE_READ)) |
| 501 | goto out_noconflict; |
| 502 | |
| 503 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) |
| 504 | goto out_noconflict; |
| 505 | |
| 506 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
| 507 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | unlock_kernel(); |
| 509 | return status; |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 510 | out_noconflict: |
| 511 | fl->fl_type = F_UNLCK; |
| 512 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | } |
| 514 | |
| 515 | static int do_vfs_lock(struct file *file, struct file_lock *fl) |
| 516 | { |
| 517 | int res = 0; |
| 518 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { |
| 519 | case FL_POSIX: |
| 520 | res = posix_lock_file_wait(file, fl); |
| 521 | break; |
| 522 | case FL_FLOCK: |
| 523 | res = flock_lock_file_wait(file, fl); |
| 524 | break; |
| 525 | default: |
| 526 | BUG(); |
| 527 | } |
| 528 | if (res < 0) |
Neil Brown | 46bae1a | 2007-01-30 14:36:01 -0800 | [diff] [blame] | 529 | dprintk(KERN_WARNING "%s: VFS is out of sync with lock manager" |
| 530 | " - error %d!\n", |
| 531 | __FUNCTION__, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | return res; |
| 533 | } |
| 534 | |
| 535 | static int do_unlk(struct file *filp, int cmd, struct file_lock *fl) |
| 536 | { |
| 537 | struct inode *inode = filp->f_mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | int status; |
| 539 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | /* |
| 541 | * Flush all pending writes before doing anything |
| 542 | * with locks.. |
| 543 | */ |
Trond Myklebust | 29884df | 2005-12-13 16:13:54 -0500 | [diff] [blame] | 544 | nfs_sync_mapping(filp->f_mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | |
| 546 | /* NOTE: special case |
| 547 | * If we're signalled while cleaning up locks on process exit, we |
| 548 | * still need to complete the unlock. |
| 549 | */ |
| 550 | lock_kernel(); |
| 551 | /* Use local locking if mounted with "-onolock" */ |
| 552 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) |
| 553 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
| 554 | else |
| 555 | status = do_vfs_lock(filp, fl); |
| 556 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | return status; |
| 558 | } |
| 559 | |
| 560 | static int do_setlk(struct file *filp, int cmd, struct file_lock *fl) |
| 561 | { |
| 562 | struct inode *inode = filp->f_mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | int status; |
| 564 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | /* |
| 566 | * Flush all pending writes before doing anything |
| 567 | * with locks.. |
| 568 | */ |
Trond Myklebust | 29884df | 2005-12-13 16:13:54 -0500 | [diff] [blame] | 569 | status = nfs_sync_mapping(filp->f_mapping); |
| 570 | if (status != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | goto out; |
| 572 | |
| 573 | lock_kernel(); |
| 574 | /* Use local locking if mounted with "-onolock" */ |
| 575 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) { |
| 576 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
| 577 | /* If we were signalled we still need to ensure that |
| 578 | * we clean up any state on the server. We therefore |
| 579 | * record the lock call as having succeeded in order to |
| 580 | * ensure that locks_remove_posix() cleans it out when |
| 581 | * the process exits. |
| 582 | */ |
| 583 | if (status == -EINTR || status == -ERESTARTSYS) |
| 584 | do_vfs_lock(filp, fl); |
| 585 | } else |
| 586 | status = do_vfs_lock(filp, fl); |
| 587 | unlock_kernel(); |
| 588 | if (status < 0) |
| 589 | goto out; |
| 590 | /* |
| 591 | * Make sure we clear the cache whenever we try to get the lock. |
| 592 | * This makes locking act as a cache coherency point. |
| 593 | */ |
Trond Myklebust | 29884df | 2005-12-13 16:13:54 -0500 | [diff] [blame] | 594 | nfs_sync_mapping(filp->f_mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | nfs_zap_caches(inode); |
| 596 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | return status; |
| 598 | } |
| 599 | |
| 600 | /* |
| 601 | * Lock a (portion of) a file |
| 602 | */ |
| 603 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) |
| 604 | { |
| 605 | struct inode * inode = filp->f_mapping->host; |
| 606 | |
| 607 | dprintk("NFS: nfs_lock(f=%s/%ld, t=%x, fl=%x, r=%Ld:%Ld)\n", |
| 608 | inode->i_sb->s_id, inode->i_ino, |
| 609 | fl->fl_type, fl->fl_flags, |
| 610 | (long long)fl->fl_start, (long long)fl->fl_end); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 611 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | |
| 613 | /* No mandatory locks over NFS */ |
Pavel Emelyanov | dfad944 | 2007-10-01 14:41:15 -0700 | [diff] [blame] | 614 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | return -ENOLCK; |
| 616 | |
| 617 | if (IS_GETLK(cmd)) |
| 618 | return do_getlk(filp, cmd, fl); |
| 619 | if (fl->fl_type == F_UNLCK) |
| 620 | return do_unlk(filp, cmd, fl); |
| 621 | return do_setlk(filp, cmd, fl); |
| 622 | } |
| 623 | |
| 624 | /* |
| 625 | * Lock a (portion of) a file |
| 626 | */ |
| 627 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) |
| 628 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | dprintk("NFS: nfs_flock(f=%s/%ld, t=%x, fl=%x)\n", |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 630 | filp->f_path.dentry->d_inode->i_sb->s_id, |
| 631 | filp->f_path.dentry->d_inode->i_ino, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | fl->fl_type, fl->fl_flags); |
| 633 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | /* |
| 635 | * No BSD flocks over NFS allowed. |
| 636 | * Note: we could try to fake a POSIX lock request here by |
| 637 | * using ((u32) filp | 0x80000000) or some such as the pid. |
| 638 | * Not sure whether that would be unique, though, or whether |
| 639 | * that would break in other places. |
| 640 | */ |
| 641 | if (!(fl->fl_flags & FL_FLOCK)) |
| 642 | return -ENOLCK; |
| 643 | |
| 644 | /* We're simulating flock() locks using posix locks on the server */ |
| 645 | fl->fl_owner = (fl_owner_t)filp; |
| 646 | fl->fl_start = 0; |
| 647 | fl->fl_end = OFFSET_MAX; |
| 648 | |
| 649 | if (fl->fl_type == F_UNLCK) |
| 650 | return do_unlk(filp, cmd, fl); |
| 651 | return do_setlk(filp, cmd, fl); |
| 652 | } |
J. Bruce Fields | 370f659 | 2007-06-08 15:23:34 -0400 | [diff] [blame] | 653 | |
| 654 | static int nfs_setlease(struct file *file, long arg, struct file_lock **fl) |
| 655 | { |
| 656 | /* |
| 657 | * There is no protocol support for leases, so we have no way |
| 658 | * to implement them correctly in the face of opens by other |
| 659 | * clients. |
| 660 | */ |
| 661 | return -EINVAL; |
| 662 | } |