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 | |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 19 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/time.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/fcntl.h> |
| 24 | #include <linux/stat.h> |
| 25 | #include <linux/nfs_fs.h> |
| 26 | #include <linux/nfs_mount.h> |
| 27 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/pagemap.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 29 | #include <linux/aio.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 30 | #include <linux/gfp.h> |
Trond Myklebust | b608b28 | 2010-07-30 15:31:54 -0400 | [diff] [blame] | 31 | #include <linux/swap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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" |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 38 | #include "fscache.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | #define NFSDBG_FACILITY NFSDBG_FILE |
| 41 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 42 | static const struct vm_operations_struct nfs_file_vm_ops; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | /* Hack for future NFS swap support */ |
| 45 | #ifndef IS_SWAPFILE |
| 46 | # define IS_SWAPFILE(inode) (0) |
| 47 | #endif |
| 48 | |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 49 | int nfs_check_flags(int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | { |
| 51 | if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) |
| 52 | return -EINVAL; |
| 53 | |
| 54 | return 0; |
| 55 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 56 | EXPORT_SYMBOL_GPL(nfs_check_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | /* |
| 59 | * Open file |
| 60 | */ |
| 61 | static int |
| 62 | nfs_file_open(struct inode *inode, struct file *filp) |
| 63 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | int res; |
| 65 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 66 | dprintk("NFS: open file(%s/%s)\n", |
Chuck Lever | cc0dd2d | 2008-06-11 17:55:42 -0400 | [diff] [blame] | 67 | filp->f_path.dentry->d_parent->d_name.name, |
| 68 | filp->f_path.dentry->d_name.name); |
| 69 | |
Chuck Lever | c2459dc | 2010-02-01 14:17:14 -0500 | [diff] [blame] | 70 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | res = nfs_check_flags(filp->f_flags); |
| 72 | if (res) |
| 73 | return res; |
| 74 | |
Trond Myklebust | 46cb650 | 2008-06-11 16:32:46 -0400 | [diff] [blame] | 75 | res = nfs_open(inode, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | return res; |
| 77 | } |
| 78 | |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 79 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | nfs_file_release(struct inode *inode, struct file *filp) |
| 81 | { |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 82 | dprintk("NFS: release(%s/%s)\n", |
Rakib Mullick | 6f276e4 | 2011-11-01 12:16:15 +0600 | [diff] [blame] | 83 | filp->f_path.dentry->d_parent->d_name.name, |
| 84 | filp->f_path.dentry->d_name.name); |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 85 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 86 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
Trond Myklebust | 46cb650 | 2008-06-11 16:32:46 -0400 | [diff] [blame] | 87 | return nfs_release(inode, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 89 | EXPORT_SYMBOL_GPL(nfs_file_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 91 | /** |
| 92 | * nfs_revalidate_size - Revalidate the file size |
| 93 | * @inode - pointer to inode struct |
| 94 | * @file - pointer to struct file |
| 95 | * |
| 96 | * Revalidates the file length. This is basically a wrapper around |
| 97 | * nfs_revalidate_inode() that takes into account the fact that we may |
| 98 | * have cached writes (in which case we don't care about the server's |
| 99 | * idea of what the file length is), or O_DIRECT (in which case we |
| 100 | * shouldn't trust the cache). |
| 101 | */ |
| 102 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) |
| 103 | { |
| 104 | struct nfs_server *server = NFS_SERVER(inode); |
| 105 | struct nfs_inode *nfsi = NFS_I(inode); |
| 106 | |
Trond Myklebust | d7cf8dd | 2010-04-16 16:42:46 -0400 | [diff] [blame] | 107 | if (nfs_have_delegated_attributes(inode)) |
| 108 | goto out_noreval; |
| 109 | |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 110 | if (filp->f_flags & O_DIRECT) |
| 111 | goto force_reval; |
Trond Myklebust | d7cf8dd | 2010-04-16 16:42:46 -0400 | [diff] [blame] | 112 | if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) |
| 113 | goto force_reval; |
| 114 | if (nfs_attribute_timeout(inode)) |
| 115 | goto force_reval; |
| 116 | out_noreval: |
| 117 | return 0; |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 118 | force_reval: |
| 119 | return __nfs_revalidate_inode(server, inode); |
| 120 | } |
| 121 | |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 122 | loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 123 | { |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 124 | dprintk("NFS: llseek file(%s/%s, %lld, %d)\n", |
Chuck Lever | b84e06c | 2008-06-11 17:55:34 -0400 | [diff] [blame] | 125 | filp->f_path.dentry->d_parent->d_name.name, |
| 126 | filp->f_path.dentry->d_name.name, |
| 127 | offset, origin); |
| 128 | |
Josef Bacik | 06222e4 | 2011-07-18 13:21:38 -0400 | [diff] [blame] | 129 | /* |
| 130 | * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate |
| 131 | * the cached file length |
| 132 | */ |
Trond Myklebust | 6c52961 | 2011-12-15 18:38:10 -0500 | [diff] [blame] | 133 | if (origin != SEEK_SET && origin != SEEK_CUR) { |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 134 | struct inode *inode = filp->f_mapping->host; |
Trond Myklebust | d5e6634 | 2008-09-23 17:28:35 -0400 | [diff] [blame] | 135 | |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 136 | int retval = nfs_revalidate_file_size(inode, filp); |
| 137 | if (retval < 0) |
| 138 | return (loff_t)retval; |
Andi Kleen | 79835a71 | 2011-09-15 16:06:52 -0700 | [diff] [blame] | 139 | } |
Trond Myklebust | d5e6634 | 2008-09-23 17:28:35 -0400 | [diff] [blame] | 140 | |
Andi Kleen | 79835a71 | 2011-09-15 16:06:52 -0700 | [diff] [blame] | 141 | return generic_file_llseek(filp, offset, origin); |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 142 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 143 | EXPORT_SYMBOL_GPL(nfs_file_llseek); |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | /* |
| 146 | * Flush all dirty pages, and check for write errors. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | */ |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 148 | int |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 149 | nfs_file_flush(struct file *file, fl_owner_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | { |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 151 | struct dentry *dentry = file->f_path.dentry; |
| 152 | struct inode *inode = dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 154 | dprintk("NFS: flush(%s/%s)\n", |
| 155 | dentry->d_parent->d_name.name, |
| 156 | dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
Chuck Lever | c2459dc | 2010-02-01 14:17:14 -0500 | [diff] [blame] | 158 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | if ((file->f_mode & FMODE_WRITE) == 0) |
| 160 | return 0; |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 161 | |
Trond Myklebust | 14546c3 | 2012-05-06 19:10:59 -0400 | [diff] [blame] | 162 | /* |
| 163 | * If we're holding a write delegation, then just start the i/o |
| 164 | * but don't wait for completion (or send a commit). |
| 165 | */ |
Bryan Schumaker | 011e2a7 | 2012-06-20 15:53:43 -0400 | [diff] [blame] | 166 | if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) |
Trond Myklebust | 14546c3 | 2012-05-06 19:10:59 -0400 | [diff] [blame] | 167 | return filemap_fdatawrite(file->f_mapping); |
| 168 | |
Trond Myklebust | 7fe5c39 | 2009-03-19 15:35:50 -0400 | [diff] [blame] | 169 | /* Flush writes to the server and return any errors */ |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 170 | return vfs_fsync(file, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 172 | EXPORT_SYMBOL_GPL(nfs_file_flush); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 174 | ssize_t |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 175 | nfs_file_read(struct kiocb *iocb, const struct iovec *iov, |
| 176 | unsigned long nr_segs, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 178 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | struct inode * inode = dentry->d_inode; |
| 180 | ssize_t result; |
| 181 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | if (iocb->ki_filp->f_flags & O_DIRECT) |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 183 | return nfs_file_direct_read(iocb, iov, nr_segs, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 185 | dprintk("NFS: read(%s/%s, %lu@%lu)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | dentry->d_parent->d_name.name, dentry->d_name.name, |
Rakib Mullick | 6f276e4 | 2011-11-01 12:16:15 +0600 | [diff] [blame] | 187 | (unsigned long) iov_length(iov, nr_segs), (unsigned long) pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
Trond Myklebust | 44b1187 | 2006-05-25 01:40:59 -0400 | [diff] [blame] | 189 | result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); |
Chuck Lever | 4184dcf | 2010-02-01 14:17:23 -0500 | [diff] [blame] | 190 | if (!result) { |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 191 | result = generic_file_aio_read(iocb, iov, nr_segs, pos); |
Chuck Lever | 4184dcf | 2010-02-01 14:17:23 -0500 | [diff] [blame] | 192 | if (result > 0) |
| 193 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result); |
| 194 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | return result; |
| 196 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 197 | EXPORT_SYMBOL_GPL(nfs_file_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 199 | ssize_t |
Jens Axboe | f0930ff | 2007-06-01 11:51:43 +0200 | [diff] [blame] | 200 | nfs_file_splice_read(struct file *filp, loff_t *ppos, |
| 201 | struct pipe_inode_info *pipe, size_t count, |
| 202 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 204 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | struct inode *inode = dentry->d_inode; |
| 206 | ssize_t res; |
| 207 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 208 | dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 210 | (unsigned long) count, (unsigned long long) *ppos); |
| 211 | |
Trond Myklebust | 44b1187 | 2006-05-25 01:40:59 -0400 | [diff] [blame] | 212 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
Chuck Lever | aa2f1ef | 2010-02-01 14:17:32 -0500 | [diff] [blame] | 213 | if (!res) { |
Jens Axboe | f0930ff | 2007-06-01 11:51:43 +0200 | [diff] [blame] | 214 | res = generic_file_splice_read(filp, ppos, pipe, count, flags); |
Chuck Lever | aa2f1ef | 2010-02-01 14:17:32 -0500 | [diff] [blame] | 215 | if (res > 0) |
| 216 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res); |
| 217 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | return res; |
| 219 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 220 | EXPORT_SYMBOL_GPL(nfs_file_splice_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 222 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | nfs_file_mmap(struct file * file, struct vm_area_struct * vma) |
| 224 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 225 | struct dentry *dentry = file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | struct inode *inode = dentry->d_inode; |
| 227 | int status; |
| 228 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 229 | dprintk("NFS: mmap(%s/%s)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 231 | |
Trond Myklebust | e1ebfd3 | 2009-03-11 14:37:54 -0400 | [diff] [blame] | 232 | /* Note: generic_file_mmap() returns ENOSYS on nommu systems |
| 233 | * so we call that before revalidating the mapping |
| 234 | */ |
| 235 | status = generic_file_mmap(file, vma); |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 236 | if (!status) { |
| 237 | vma->vm_ops = &nfs_file_vm_ops; |
Trond Myklebust | e1ebfd3 | 2009-03-11 14:37:54 -0400 | [diff] [blame] | 238 | status = nfs_revalidate_mapping(inode, file->f_mapping); |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 239 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | return status; |
| 241 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 242 | EXPORT_SYMBOL_GPL(nfs_file_mmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
| 244 | /* |
| 245 | * Flush any dirty pages for this process, and check for write errors. |
| 246 | * The return status from this call provides a reliable indication of |
| 247 | * whether any write errors occurred for this process. |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 248 | * |
| 249 | * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to |
| 250 | * disk, but it retrieves and clears ctx->error after synching, despite |
| 251 | * the two being set at the same time in nfs_context_set_write_error(). |
| 252 | * This is because the former is used to notify the _next_ call to |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 253 | * nfs_file_write() that a write error occurred, and hence cause it to |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 254 | * fall back to doing a synchronous write. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | */ |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 256 | int |
Bryan Schumaker | a5c5889 | 2012-06-20 15:53:42 -0400 | [diff] [blame] | 257 | nfs_file_fsync_commit(struct file *file, loff_t start, loff_t end, int datasync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | { |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 259 | struct dentry *dentry = file->f_path.dentry; |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 260 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | struct inode *inode = dentry->d_inode; |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 262 | int have_error, status; |
| 263 | int ret = 0; |
| 264 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 265 | dprintk("NFS: fsync file(%s/%s) datasync %d\n", |
Chuck Lever | 5491778 | 2008-05-27 16:29:07 -0400 | [diff] [blame] | 266 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 267 | datasync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 269 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 270 | have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); |
| 271 | status = nfs_commit_inode(inode, FLUSH_SYNC); |
NeilBrown | 2edb6bc | 2011-11-16 11:46:31 +1100 | [diff] [blame] | 272 | if (status >= 0 && ret < 0) |
| 273 | status = ret; |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 274 | have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); |
| 275 | if (have_error) |
| 276 | ret = xchg(&ctx->error, 0); |
J. R. Okajima | 0702099 | 2010-08-11 13:10:16 -0400 | [diff] [blame] | 277 | if (!ret && status < 0) |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 278 | ret = status; |
Bryan Schumaker | a5c5889 | 2012-06-20 15:53:42 -0400 | [diff] [blame] | 279 | return ret; |
| 280 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 281 | EXPORT_SYMBOL_GPL(nfs_file_fsync_commit); |
Bryan Schumaker | a5c5889 | 2012-06-20 15:53:42 -0400 | [diff] [blame] | 282 | |
| 283 | static int |
| 284 | nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
| 285 | { |
| 286 | int ret; |
| 287 | struct inode *inode = file->f_path.dentry->d_inode; |
| 288 | |
| 289 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); |
| 290 | mutex_lock(&inode->i_mutex); |
| 291 | ret = nfs_file_fsync_commit(file, start, end, datasync); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 292 | mutex_unlock(&inode->i_mutex); |
Bryan Schumaker | a5c5889 | 2012-06-20 15:53:42 -0400 | [diff] [blame] | 293 | |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 294 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | } |
| 296 | |
| 297 | /* |
Peter Staubach | 38c7304 | 2009-08-10 08:54:16 -0400 | [diff] [blame] | 298 | * Decide whether a read/modify/write cycle may be more efficient |
| 299 | * then a modify/write/read cycle when writing to a page in the |
| 300 | * page cache. |
| 301 | * |
| 302 | * The modify/write/read cycle may occur if a page is read before |
| 303 | * being completely filled by the writer. In this situation, the |
| 304 | * page must be completely written to stable storage on the server |
| 305 | * before it can be refilled by reading in the page from the server. |
| 306 | * This can lead to expensive, small, FILE_SYNC mode writes being |
| 307 | * done. |
| 308 | * |
| 309 | * It may be more efficient to read the page first if the file is |
| 310 | * open for reading in addition to writing, the page is not marked |
| 311 | * as Uptodate, it is not dirty or waiting to be committed, |
| 312 | * indicating that it was previously allocated and then modified, |
| 313 | * that there were valid bytes of data in that range of the file, |
| 314 | * and that the new data won't completely replace the old data in |
| 315 | * that range of the file. |
| 316 | */ |
| 317 | static int nfs_want_read_modify_write(struct file *file, struct page *page, |
| 318 | loff_t pos, unsigned len) |
| 319 | { |
| 320 | unsigned int pglen = nfs_page_length(page); |
| 321 | unsigned int offset = pos & (PAGE_CACHE_SIZE - 1); |
| 322 | unsigned int end = offset + len; |
| 323 | |
| 324 | if ((file->f_mode & FMODE_READ) && /* open for read? */ |
| 325 | !PageUptodate(page) && /* Uptodate? */ |
| 326 | !PagePrivate(page) && /* i/o request already? */ |
| 327 | pglen && /* valid bytes of file? */ |
| 328 | (end < pglen || offset)) /* replace all valid bytes? */ |
| 329 | return 1; |
| 330 | return 0; |
| 331 | } |
| 332 | |
| 333 | /* |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 334 | * This does the "real" work of the write. We must allocate and lock the |
| 335 | * page to be sent back to the generic routine, which then copies the |
| 336 | * data from user space. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | * |
| 338 | * If the writer ends up delaying the write, the writer needs to |
| 339 | * increment the page use counts until he is done with the page. |
| 340 | */ |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 341 | static int nfs_write_begin(struct file *file, struct address_space *mapping, |
| 342 | loff_t pos, unsigned len, unsigned flags, |
| 343 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | { |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 345 | int ret; |
Peter Staubach | 38c7304 | 2009-08-10 08:54:16 -0400 | [diff] [blame] | 346 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 347 | struct page *page; |
Peter Staubach | 38c7304 | 2009-08-10 08:54:16 -0400 | [diff] [blame] | 348 | int once_thru = 0; |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 349 | |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 350 | dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n", |
| 351 | file->f_path.dentry->d_parent->d_name.name, |
| 352 | file->f_path.dentry->d_name.name, |
| 353 | mapping->host->i_ino, len, (long long) pos); |
| 354 | |
Peter Staubach | 38c7304 | 2009-08-10 08:54:16 -0400 | [diff] [blame] | 355 | start: |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 356 | /* |
| 357 | * Prevent starvation issues if someone is doing a consistency |
| 358 | * sync-to-disk |
| 359 | */ |
| 360 | ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING, |
| 361 | nfs_wait_bit_killable, TASK_KILLABLE); |
| 362 | if (ret) |
| 363 | return ret; |
| 364 | |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 365 | page = grab_cache_page_write_begin(mapping, index, flags); |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 366 | if (!page) |
| 367 | return -ENOMEM; |
| 368 | *pagep = page; |
| 369 | |
| 370 | ret = nfs_flush_incompatible(file, page); |
| 371 | if (ret) { |
| 372 | unlock_page(page); |
| 373 | page_cache_release(page); |
Peter Staubach | 38c7304 | 2009-08-10 08:54:16 -0400 | [diff] [blame] | 374 | } else if (!once_thru && |
| 375 | nfs_want_read_modify_write(file, page, pos, len)) { |
| 376 | once_thru = 1; |
| 377 | ret = nfs_readpage(file, page); |
| 378 | page_cache_release(page); |
| 379 | if (!ret) |
| 380 | goto start; |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 381 | } |
| 382 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | } |
| 384 | |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 385 | static int nfs_write_end(struct file *file, struct address_space *mapping, |
| 386 | loff_t pos, unsigned len, unsigned copied, |
| 387 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | { |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 389 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
| 390 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 392 | dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n", |
| 393 | file->f_path.dentry->d_parent->d_name.name, |
| 394 | file->f_path.dentry->d_name.name, |
| 395 | mapping->host->i_ino, len, (long long) pos); |
| 396 | |
Trond Myklebust | efc91ed | 2008-06-10 18:31:00 -0400 | [diff] [blame] | 397 | /* |
| 398 | * Zero any uninitialised parts of the page, and then mark the page |
| 399 | * as up to date if it turns out that we're extending the file. |
| 400 | */ |
| 401 | if (!PageUptodate(page)) { |
| 402 | unsigned pglen = nfs_page_length(page); |
| 403 | unsigned end = offset + len; |
| 404 | |
| 405 | if (pglen == 0) { |
| 406 | zero_user_segments(page, 0, offset, |
| 407 | end, PAGE_CACHE_SIZE); |
| 408 | SetPageUptodate(page); |
| 409 | } else if (end >= pglen) { |
| 410 | zero_user_segment(page, end, PAGE_CACHE_SIZE); |
| 411 | if (offset == 0) |
| 412 | SetPageUptodate(page); |
| 413 | } else |
| 414 | zero_user_segment(page, pglen, PAGE_CACHE_SIZE); |
| 415 | } |
| 416 | |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 417 | status = nfs_updatepage(file, page, offset, copied); |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 418 | |
| 419 | unlock_page(page); |
| 420 | page_cache_release(page); |
| 421 | |
Chuck Lever | 3d509e5 | 2007-12-20 14:55:04 -0500 | [diff] [blame] | 422 | if (status < 0) |
| 423 | return status; |
Andy Adamson | 2701d08 | 2012-05-24 13:13:24 -0400 | [diff] [blame] | 424 | NFS_I(mapping->host)->write_io += copied; |
Chuck Lever | 3d509e5 | 2007-12-20 14:55:04 -0500 | [diff] [blame] | 425 | return copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | } |
| 427 | |
David Howells | 6b9b351 | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 428 | /* |
| 429 | * Partially or wholly invalidate a page |
| 430 | * - Release the private state associated with a page if undergoing complete |
| 431 | * page invalidation |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 432 | * - 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] | 433 | * - Caller holds page lock |
| 434 | */ |
NeilBrown | 2ff28e2 | 2006-03-26 01:37:18 -0800 | [diff] [blame] | 435 | static void nfs_invalidate_page(struct page *page, unsigned long offset) |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 436 | { |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 437 | dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset); |
| 438 | |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 439 | if (offset != 0) |
| 440 | return; |
Trond Myklebust | d2ccddf | 2006-05-31 01:13:38 -0400 | [diff] [blame] | 441 | /* Cancel any unstarted writes on this page */ |
Trond Myklebust | 1b3b4a1 | 2007-08-28 10:29:36 -0400 | [diff] [blame] | 442 | nfs_wb_page_cancel(page->mapping->host, page); |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 443 | |
| 444 | nfs_fscache_invalidate_page(page, page->mapping->host); |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 445 | } |
| 446 | |
David Howells | 6b9b351 | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 447 | /* |
| 448 | * Attempt to release the private state associated with a page |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 449 | * - 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] | 450 | * - Caller holds page lock |
| 451 | * - Return true (may release page) or false (may not) |
| 452 | */ |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 453 | static int nfs_release_page(struct page *page, gfp_t gfp) |
| 454 | { |
Trond Myklebust | b608b28 | 2010-07-30 15:31:54 -0400 | [diff] [blame] | 455 | struct address_space *mapping = page->mapping; |
| 456 | |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 457 | dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page); |
| 458 | |
Jeff Layton | 5cf02d0 | 2012-07-23 13:58:51 -0400 | [diff] [blame] | 459 | /* Only do I/O if gfp is a superset of GFP_KERNEL, and we're not |
| 460 | * doing this memory reclaim for a fs-related allocation. |
| 461 | */ |
| 462 | if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL && |
| 463 | !(current->flags & PF_FSTRANS)) { |
Trond Myklebust | b608b28 | 2010-07-30 15:31:54 -0400 | [diff] [blame] | 464 | int how = FLUSH_SYNC; |
| 465 | |
| 466 | /* Don't let kswapd deadlock waiting for OOM RPC calls */ |
| 467 | if (current_is_kswapd()) |
| 468 | how = 0; |
| 469 | nfs_commit_inode(mapping->host, how); |
| 470 | } |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 471 | /* If PagePrivate() is set, then the page is not freeable */ |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 472 | if (PagePrivate(page)) |
| 473 | return 0; |
| 474 | return nfs_fscache_release_page(page, gfp); |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 475 | } |
| 476 | |
David Howells | 6b9b351 | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 477 | /* |
| 478 | * Attempt to clear the private state associated with a page when an error |
| 479 | * occurs that requires the cached contents of an inode to be written back or |
| 480 | * destroyed |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 481 | * - Called if either PG_private or 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 0 if successful, -error otherwise |
| 484 | */ |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 485 | static int nfs_launder_page(struct page *page) |
| 486 | { |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 487 | struct inode *inode = page->mapping->host; |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 488 | struct nfs_inode *nfsi = NFS_I(inode); |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 489 | |
| 490 | dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n", |
| 491 | inode->i_ino, (long long)page_offset(page)); |
| 492 | |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 493 | nfs_fscache_wait_on_page_write(nfsi, page); |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 494 | return nfs_wb_page(inode, page); |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 495 | } |
| 496 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 497 | const struct address_space_operations nfs_file_aops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | .readpage = nfs_readpage, |
| 499 | .readpages = nfs_readpages, |
Trond Myklebust | 9cccef9 | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 500 | .set_page_dirty = __set_page_dirty_nobuffers, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | .writepage = nfs_writepage, |
| 502 | .writepages = nfs_writepages, |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 503 | .write_begin = nfs_write_begin, |
| 504 | .write_end = nfs_write_end, |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 505 | .invalidatepage = nfs_invalidate_page, |
| 506 | .releasepage = nfs_release_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | .direct_IO = nfs_direct_IO, |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 508 | .migratepage = nfs_migrate_page, |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 509 | .launder_page = nfs_launder_page, |
Andi Kleen | f590f33 | 2009-09-16 11:50:17 +0200 | [diff] [blame] | 510 | .error_remove_page = generic_error_remove_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | }; |
| 512 | |
David Howells | 6b9b351 | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 513 | /* |
| 514 | * Notification that a PTE pointing to an NFS page is about to be made |
| 515 | * writable, implying that someone is about to modify the page through a |
| 516 | * shared-writable mapping |
| 517 | */ |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 518 | 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] | 519 | { |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 520 | struct page *page = vmf->page; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 521 | struct file *filp = vma->vm_file; |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 522 | struct dentry *dentry = filp->f_path.dentry; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 523 | unsigned pagelen; |
Trond Myklebust | bc4866b | 2010-10-04 17:59:08 -0400 | [diff] [blame] | 524 | int ret = VM_FAULT_NOPAGE; |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 525 | struct address_space *mapping; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 526 | |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 527 | dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n", |
| 528 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 529 | filp->f_mapping->host->i_ino, |
| 530 | (long long)page_offset(page)); |
| 531 | |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 532 | /* make sure the cache has finished storing the page */ |
| 533 | nfs_fscache_wait_on_page_write(NFS_I(dentry->d_inode), page); |
| 534 | |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 535 | lock_page(page); |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 536 | mapping = page->mapping; |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 537 | if (mapping != dentry->d_inode->i_mapping) |
Trond Myklebust | 8b1f9ee | 2008-01-22 17:13:06 -0500 | [diff] [blame] | 538 | goto out_unlock; |
| 539 | |
Trond Myklebust | 2aeb98f | 2012-01-17 22:04:26 -0500 | [diff] [blame] | 540 | wait_on_page_writeback(page); |
| 541 | |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 542 | pagelen = nfs_page_length(page); |
Trond Myklebust | 8b1f9ee | 2008-01-22 17:13:06 -0500 | [diff] [blame] | 543 | if (pagelen == 0) |
| 544 | goto out_unlock; |
| 545 | |
Trond Myklebust | bc4866b | 2010-10-04 17:59:08 -0400 | [diff] [blame] | 546 | ret = VM_FAULT_LOCKED; |
| 547 | if (nfs_flush_incompatible(filp, page) == 0 && |
| 548 | nfs_updatepage(filp, page, 0, pagelen) == 0) |
| 549 | goto out; |
Trond Myklebust | 8b1f9ee | 2008-01-22 17:13:06 -0500 | [diff] [blame] | 550 | |
Trond Myklebust | bc4866b | 2010-10-04 17:59:08 -0400 | [diff] [blame] | 551 | ret = VM_FAULT_SIGBUS; |
Trond Myklebust | 8b1f9ee | 2008-01-22 17:13:06 -0500 | [diff] [blame] | 552 | out_unlock: |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 553 | unlock_page(page); |
Trond Myklebust | bc4866b | 2010-10-04 17:59:08 -0400 | [diff] [blame] | 554 | out: |
| 555 | return ret; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 556 | } |
| 557 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 558 | static const struct vm_operations_struct nfs_file_vm_ops = { |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 559 | .fault = filemap_fault, |
| 560 | .page_mkwrite = nfs_vm_page_mkwrite, |
| 561 | }; |
| 562 | |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 563 | static int nfs_need_sync_write(struct file *filp, struct inode *inode) |
| 564 | { |
| 565 | struct nfs_open_context *ctx; |
| 566 | |
Christoph Hellwig | 6b2f3d1 | 2009-10-27 11:05:28 +0100 | [diff] [blame] | 567 | if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC)) |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 568 | return 1; |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 569 | ctx = nfs_file_open_context(filp); |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 570 | if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags)) |
| 571 | return 1; |
| 572 | return 0; |
| 573 | } |
| 574 | |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 575 | ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, |
| 576 | unsigned long nr_segs, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 578 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | struct inode * inode = dentry->d_inode; |
Chuck Lever | 7e38117 | 2010-02-01 14:17:41 -0500 | [diff] [blame] | 580 | unsigned long written = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | ssize_t result; |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 582 | size_t count = iov_length(iov, nr_segs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | if (iocb->ki_filp->f_flags & O_DIRECT) |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 585 | return nfs_file_direct_write(iocb, iov, nr_segs, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 587 | dprintk("NFS: write(%s/%s, %lu@%Ld)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | dentry->d_parent->d_name.name, dentry->d_name.name, |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 589 | (unsigned long) count, (long long) pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | |
| 591 | result = -EBUSY; |
| 592 | if (IS_SWAPFILE(inode)) |
| 593 | goto out_swapfile; |
Trond Myklebust | 7d52e86 | 2005-06-22 17:16:30 +0000 | [diff] [blame] | 594 | /* |
| 595 | * O_APPEND implies that we must revalidate the file length. |
| 596 | */ |
| 597 | if (iocb->ki_filp->f_flags & O_APPEND) { |
| 598 | result = nfs_revalidate_file_size(inode, iocb->ki_filp); |
| 599 | if (result) |
| 600 | goto out; |
Trond Myklebust | fe51beec | 2005-06-22 17:16:30 +0000 | [diff] [blame] | 601 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | |
| 603 | result = count; |
| 604 | if (!count) |
| 605 | goto out; |
| 606 | |
Badari Pulavarty | 027445c | 2006-09-30 23:28:46 -0700 | [diff] [blame] | 607 | result = generic_file_aio_write(iocb, iov, nr_segs, pos); |
Chuck Lever | 7e38117 | 2010-02-01 14:17:41 -0500 | [diff] [blame] | 608 | if (result > 0) |
| 609 | written = result; |
| 610 | |
Christoph Hellwig | 6b2f3d1 | 2009-10-27 11:05:28 +0100 | [diff] [blame] | 611 | /* Return error values for O_DSYNC and IS_SYNC() */ |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 612 | if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) { |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 613 | int err = vfs_fsync(iocb->ki_filp, 0); |
Trond Myklebust | 200baa2 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 614 | if (err < 0) |
| 615 | result = err; |
| 616 | } |
Chuck Lever | 7e38117 | 2010-02-01 14:17:41 -0500 | [diff] [blame] | 617 | if (result > 0) |
| 618 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | out: |
| 620 | return result; |
| 621 | |
| 622 | out_swapfile: |
| 623 | printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); |
| 624 | goto out; |
| 625 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 626 | EXPORT_SYMBOL_GPL(nfs_file_write); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 628 | ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe, |
| 629 | struct file *filp, loff_t *ppos, |
| 630 | size_t count, unsigned int flags) |
Suresh Jayaraman | bf40d34 | 2009-06-17 18:02:09 -0700 | [diff] [blame] | 631 | { |
| 632 | struct dentry *dentry = filp->f_path.dentry; |
| 633 | struct inode *inode = dentry->d_inode; |
Chuck Lever | 7e38117 | 2010-02-01 14:17:41 -0500 | [diff] [blame] | 634 | unsigned long written = 0; |
Suresh Jayaraman | bf40d34 | 2009-06-17 18:02:09 -0700 | [diff] [blame] | 635 | ssize_t ret; |
| 636 | |
| 637 | dprintk("NFS splice_write(%s/%s, %lu@%llu)\n", |
| 638 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 639 | (unsigned long) count, (unsigned long long) *ppos); |
| 640 | |
| 641 | /* |
| 642 | * The combination of splice and an O_APPEND destination is disallowed. |
| 643 | */ |
| 644 | |
Suresh Jayaraman | bf40d34 | 2009-06-17 18:02:09 -0700 | [diff] [blame] | 645 | ret = generic_file_splice_write(pipe, filp, ppos, count, flags); |
Chuck Lever | 7e38117 | 2010-02-01 14:17:41 -0500 | [diff] [blame] | 646 | if (ret > 0) |
| 647 | written = ret; |
| 648 | |
Suresh Jayaraman | bf40d34 | 2009-06-17 18:02:09 -0700 | [diff] [blame] | 649 | if (ret >= 0 && nfs_need_sync_write(filp, inode)) { |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 650 | int err = vfs_fsync(filp, 0); |
Suresh Jayaraman | bf40d34 | 2009-06-17 18:02:09 -0700 | [diff] [blame] | 651 | if (err < 0) |
| 652 | ret = err; |
| 653 | } |
Chuck Lever | 7e38117 | 2010-02-01 14:17:41 -0500 | [diff] [blame] | 654 | if (ret > 0) |
| 655 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written); |
Suresh Jayaraman | bf40d34 | 2009-06-17 18:02:09 -0700 | [diff] [blame] | 656 | return ret; |
| 657 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 658 | EXPORT_SYMBOL_GPL(nfs_file_splice_write); |
Suresh Jayaraman | bf40d34 | 2009-06-17 18:02:09 -0700 | [diff] [blame] | 659 | |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 660 | static int |
| 661 | do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | { |
| 663 | struct inode *inode = filp->f_mapping->host; |
| 664 | int status = 0; |
Sergey Vlasov | 21ac19d | 2010-11-28 21:04:05 +0000 | [diff] [blame] | 665 | unsigned int saved_type = fl->fl_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 667 | /* Try local locking first */ |
J. Bruce Fields | 6d34ac1 | 2007-05-11 16:09:32 -0400 | [diff] [blame] | 668 | posix_test_lock(filp, fl); |
| 669 | if (fl->fl_type != F_UNLCK) { |
| 670 | /* found a conflict */ |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 671 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | } |
Sergey Vlasov | 21ac19d | 2010-11-28 21:04:05 +0000 | [diff] [blame] | 673 | fl->fl_type = saved_type; |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 674 | |
Bryan Schumaker | 011e2a7 | 2012-06-20 15:53:43 -0400 | [diff] [blame] | 675 | if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 676 | goto out_noconflict; |
| 677 | |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 678 | if (is_local) |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 679 | goto out_noconflict; |
| 680 | |
| 681 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
| 682 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | return status; |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 684 | out_noconflict: |
| 685 | fl->fl_type = F_UNLCK; |
| 686 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | } |
| 688 | |
| 689 | static int do_vfs_lock(struct file *file, struct file_lock *fl) |
| 690 | { |
| 691 | int res = 0; |
| 692 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { |
| 693 | case FL_POSIX: |
| 694 | res = posix_lock_file_wait(file, fl); |
| 695 | break; |
| 696 | case FL_FLOCK: |
| 697 | res = flock_lock_file_wait(file, fl); |
| 698 | break; |
| 699 | default: |
| 700 | BUG(); |
| 701 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | return res; |
| 703 | } |
| 704 | |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 705 | static int |
| 706 | do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | { |
| 708 | struct inode *inode = filp->f_mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | int status; |
| 710 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | /* |
| 712 | * Flush all pending writes before doing anything |
| 713 | * with locks.. |
| 714 | */ |
Trond Myklebust | 29884df | 2005-12-13 16:13:54 -0500 | [diff] [blame] | 715 | nfs_sync_mapping(filp->f_mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | |
| 717 | /* NOTE: special case |
| 718 | * If we're signalled while cleaning up locks on process exit, we |
| 719 | * still need to complete the unlock. |
| 720 | */ |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 721 | /* |
| 722 | * Use local locking if mounted with "-onolock" or with appropriate |
| 723 | * "-olocal_lock=" |
| 724 | */ |
| 725 | if (!is_local) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
| 727 | else |
| 728 | status = do_vfs_lock(filp, fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | return status; |
| 730 | } |
| 731 | |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 732 | static int |
Ricardo Labiaga | 6b96724 | 2010-10-12 16:30:05 -0700 | [diff] [blame] | 733 | is_time_granular(struct timespec *ts) { |
| 734 | return ((ts->tv_sec == 0) && (ts->tv_nsec <= 1000)); |
| 735 | } |
| 736 | |
| 737 | static int |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 738 | do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | { |
| 740 | struct inode *inode = filp->f_mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | int status; |
| 742 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | /* |
| 744 | * Flush all pending writes before doing anything |
| 745 | * with locks.. |
| 746 | */ |
Trond Myklebust | 29884df | 2005-12-13 16:13:54 -0500 | [diff] [blame] | 747 | status = nfs_sync_mapping(filp->f_mapping); |
| 748 | if (status != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | goto out; |
| 750 | |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 751 | /* |
| 752 | * Use local locking if mounted with "-onolock" or with appropriate |
| 753 | * "-olocal_lock=" |
| 754 | */ |
| 755 | if (!is_local) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
Trond Myklebust | c4d7c40 | 2008-04-01 20:26:52 -0400 | [diff] [blame] | 757 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | status = do_vfs_lock(filp, fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | if (status < 0) |
| 760 | goto out; |
Ricardo Labiaga | 6b96724 | 2010-10-12 16:30:05 -0700 | [diff] [blame] | 761 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | /* |
Ricardo Labiaga | 6b96724 | 2010-10-12 16:30:05 -0700 | [diff] [blame] | 763 | * Revalidate the cache if the server has time stamps granular |
| 764 | * enough to detect subsecond changes. Otherwise, clear the |
| 765 | * cache to prevent missing any changes. |
| 766 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | * This makes locking act as a cache coherency point. |
| 768 | */ |
Trond Myklebust | 29884df | 2005-12-13 16:13:54 -0500 | [diff] [blame] | 769 | nfs_sync_mapping(filp->f_mapping); |
Bryan Schumaker | 011e2a7 | 2012-06-20 15:53:43 -0400 | [diff] [blame] | 770 | if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) { |
Ricardo Labiaga | 6b96724 | 2010-10-12 16:30:05 -0700 | [diff] [blame] | 771 | if (is_time_granular(&NFS_SERVER(inode)->time_delta)) |
| 772 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| 773 | else |
| 774 | nfs_zap_caches(inode); |
| 775 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | return status; |
| 778 | } |
| 779 | |
| 780 | /* |
| 781 | * Lock a (portion of) a file |
| 782 | */ |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 783 | int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | { |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 785 | struct inode *inode = filp->f_mapping->host; |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 786 | int ret = -ENOLCK; |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 787 | int is_local = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 789 | dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n", |
| 790 | filp->f_path.dentry->d_parent->d_name.name, |
| 791 | filp->f_path.dentry->d_name.name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | fl->fl_type, fl->fl_flags, |
| 793 | (long long)fl->fl_start, (long long)fl->fl_end); |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 794 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 795 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | |
| 797 | /* No mandatory locks over NFS */ |
Pavel Emelyanov | dfad944 | 2007-10-01 14:41:15 -0700 | [diff] [blame] | 798 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 799 | goto out_err; |
| 800 | |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 801 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL) |
| 802 | is_local = 1; |
| 803 | |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 804 | if (NFS_PROTO(inode)->lock_check_bounds != NULL) { |
| 805 | ret = NFS_PROTO(inode)->lock_check_bounds(fl); |
| 806 | if (ret < 0) |
| 807 | goto out_err; |
| 808 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | |
| 810 | if (IS_GETLK(cmd)) |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 811 | ret = do_getlk(filp, cmd, fl, is_local); |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 812 | else if (fl->fl_type == F_UNLCK) |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 813 | ret = do_unlk(filp, cmd, fl, is_local); |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 814 | else |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 815 | ret = do_setlk(filp, cmd, fl, is_local); |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 816 | out_err: |
| 817 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 819 | EXPORT_SYMBOL_GPL(nfs_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | |
| 821 | /* |
| 822 | * Lock a (portion of) a file |
| 823 | */ |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 824 | int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | { |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 826 | struct inode *inode = filp->f_mapping->host; |
| 827 | int is_local = 0; |
| 828 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 829 | dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n", |
| 830 | filp->f_path.dentry->d_parent->d_name.name, |
| 831 | filp->f_path.dentry->d_name.name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | fl->fl_type, fl->fl_flags); |
| 833 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | if (!(fl->fl_flags & FL_FLOCK)) |
| 835 | return -ENOLCK; |
| 836 | |
Jeff Layton | ad0fcd4 | 2012-07-23 15:46:23 -0400 | [diff] [blame^] | 837 | /* |
| 838 | * The NFSv4 protocol doesn't support LOCK_MAND, which is not part of |
| 839 | * any standard. In principle we might be able to support LOCK_MAND |
| 840 | * on NFSv2/3 since NLMv3/4 support DOS share modes, but for now the |
| 841 | * NFS code is not set up for it. |
| 842 | */ |
| 843 | if (fl->fl_type & LOCK_MAND) |
| 844 | return -EINVAL; |
| 845 | |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 846 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK) |
| 847 | is_local = 1; |
| 848 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | /* We're simulating flock() locks using posix locks on the server */ |
| 850 | fl->fl_owner = (fl_owner_t)filp; |
| 851 | fl->fl_start = 0; |
| 852 | fl->fl_end = OFFSET_MAX; |
| 853 | |
| 854 | if (fl->fl_type == F_UNLCK) |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 855 | return do_unlk(filp, cmd, fl, is_local); |
| 856 | return do_setlk(filp, cmd, fl, is_local); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 858 | EXPORT_SYMBOL_GPL(nfs_flock); |
J. Bruce Fields | 370f659 | 2007-06-08 15:23:34 -0400 | [diff] [blame] | 859 | |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 860 | /* |
| 861 | * There is no protocol support for leases, so we have no way to implement |
| 862 | * them correctly in the face of opens by other clients. |
| 863 | */ |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 864 | int nfs_setlease(struct file *file, long arg, struct file_lock **fl) |
J. Bruce Fields | 370f659 | 2007-06-08 15:23:34 -0400 | [diff] [blame] | 865 | { |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 866 | dprintk("NFS: setlease(%s/%s, arg=%ld)\n", |
| 867 | file->f_path.dentry->d_parent->d_name.name, |
| 868 | file->f_path.dentry->d_name.name, arg); |
J. Bruce Fields | 370f659 | 2007-06-08 15:23:34 -0400 | [diff] [blame] | 869 | return -EINVAL; |
| 870 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 871 | EXPORT_SYMBOL_GPL(nfs_setlease); |
Jeff Layton | 1788ea6 | 2011-11-04 13:31:21 -0400 | [diff] [blame] | 872 | |
Jeff Layton | 0486958 | 2011-11-04 13:31:22 -0400 | [diff] [blame] | 873 | const struct file_operations nfs_file_operations = { |
| 874 | .llseek = nfs_file_llseek, |
| 875 | .read = do_sync_read, |
| 876 | .write = do_sync_write, |
| 877 | .aio_read = nfs_file_read, |
| 878 | .aio_write = nfs_file_write, |
| 879 | .mmap = nfs_file_mmap, |
| 880 | .open = nfs_file_open, |
| 881 | .flush = nfs_file_flush, |
| 882 | .release = nfs_file_release, |
| 883 | .fsync = nfs_file_fsync, |
| 884 | .lock = nfs_lock, |
| 885 | .flock = nfs_flock, |
| 886 | .splice_read = nfs_file_splice_read, |
| 887 | .splice_write = nfs_file_splice_write, |
| 888 | .check_flags = nfs_check_flags, |
| 889 | .setlease = nfs_setlease, |
| 890 | }; |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 891 | EXPORT_SYMBOL_GPL(nfs_file_operations); |