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 | |
Trond Myklebust | f4ce129 | 2013-08-19 18:59:33 -0400 | [diff] [blame] | 40 | #include "nfstrace.h" |
| 41 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #define NFSDBG_FACILITY NFSDBG_FILE |
| 43 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 44 | static const struct vm_operations_struct nfs_file_vm_ops; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 45 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | /* Hack for future NFS swap support */ |
| 47 | #ifndef IS_SWAPFILE |
| 48 | # define IS_SWAPFILE(inode) (0) |
| 49 | #endif |
| 50 | |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 51 | int nfs_check_flags(int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | { |
| 53 | if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) |
| 54 | return -EINVAL; |
| 55 | |
| 56 | return 0; |
| 57 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 58 | EXPORT_SYMBOL_GPL(nfs_check_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | /* |
| 61 | * Open file |
| 62 | */ |
| 63 | static int |
| 64 | nfs_file_open(struct inode *inode, struct file *filp) |
| 65 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | int res; |
| 67 | |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 68 | dprintk("NFS: open file(%pD2)\n", filp); |
Chuck Lever | cc0dd2d | 2008-06-11 17:55:42 -0400 | [diff] [blame] | 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 | { |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 82 | dprintk("NFS: release(%pD2)\n", filp); |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 83 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 84 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
Trond Myklebust | 46cb650 | 2008-06-11 16:32:46 -0400 | [diff] [blame] | 85 | return nfs_release(inode, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 87 | EXPORT_SYMBOL_GPL(nfs_file_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 89 | /** |
| 90 | * nfs_revalidate_size - Revalidate the file size |
| 91 | * @inode - pointer to inode struct |
| 92 | * @file - pointer to struct file |
| 93 | * |
| 94 | * Revalidates the file length. This is basically a wrapper around |
| 95 | * nfs_revalidate_inode() that takes into account the fact that we may |
| 96 | * have cached writes (in which case we don't care about the server's |
| 97 | * idea of what the file length is), or O_DIRECT (in which case we |
| 98 | * shouldn't trust the cache). |
| 99 | */ |
| 100 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) |
| 101 | { |
| 102 | struct nfs_server *server = NFS_SERVER(inode); |
| 103 | struct nfs_inode *nfsi = NFS_I(inode); |
| 104 | |
Trond Myklebust | d7cf8dd | 2010-04-16 16:42:46 -0400 | [diff] [blame] | 105 | if (nfs_have_delegated_attributes(inode)) |
| 106 | goto out_noreval; |
| 107 | |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 108 | if (filp->f_flags & O_DIRECT) |
| 109 | goto force_reval; |
Trond Myklebust | d7cf8dd | 2010-04-16 16:42:46 -0400 | [diff] [blame] | 110 | if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) |
| 111 | goto force_reval; |
| 112 | if (nfs_attribute_timeout(inode)) |
| 113 | goto force_reval; |
| 114 | out_noreval: |
| 115 | return 0; |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 116 | force_reval: |
| 117 | return __nfs_revalidate_inode(server, inode); |
| 118 | } |
| 119 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 120 | loff_t nfs_file_llseek(struct file *filp, loff_t offset, int whence) |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 121 | { |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 122 | dprintk("NFS: llseek file(%pD2, %lld, %d)\n", |
| 123 | filp, offset, whence); |
Chuck Lever | b84e06c | 2008-06-11 17:55:34 -0400 | [diff] [blame] | 124 | |
Josef Bacik | 06222e4 | 2011-07-18 13:21:38 -0400 | [diff] [blame] | 125 | /* |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 126 | * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate |
Josef Bacik | 06222e4 | 2011-07-18 13:21:38 -0400 | [diff] [blame] | 127 | * the cached file length |
| 128 | */ |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 129 | if (whence != SEEK_SET && whence != SEEK_CUR) { |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 130 | struct inode *inode = filp->f_mapping->host; |
Trond Myklebust | d5e6634 | 2008-09-23 17:28:35 -0400 | [diff] [blame] | 131 | |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 132 | int retval = nfs_revalidate_file_size(inode, filp); |
| 133 | if (retval < 0) |
| 134 | return (loff_t)retval; |
Andi Kleen | 79835a71 | 2011-09-15 16:06:52 -0700 | [diff] [blame] | 135 | } |
Trond Myklebust | d5e6634 | 2008-09-23 17:28:35 -0400 | [diff] [blame] | 136 | |
Andrew Morton | 965c8e5 | 2012-12-17 15:59:39 -0800 | [diff] [blame] | 137 | return generic_file_llseek(filp, offset, whence); |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 138 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 139 | EXPORT_SYMBOL_GPL(nfs_file_llseek); |
Trond Myklebust | 980802e | 2005-06-13 11:14:01 -0400 | [diff] [blame] | 140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | /* |
| 142 | * Flush all dirty pages, and check for write errors. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | */ |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 144 | int |
Miklos Szeredi | 75e1fcc | 2006-06-23 02:05:12 -0700 | [diff] [blame] | 145 | nfs_file_flush(struct file *file, fl_owner_t id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | { |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 147 | struct inode *inode = file_inode(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 149 | dprintk("NFS: flush(%pD2)\n", file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
Chuck Lever | c2459dc | 2010-02-01 14:17:14 -0500 | [diff] [blame] | 151 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | if ((file->f_mode & FMODE_WRITE) == 0) |
| 153 | return 0; |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 154 | |
Trond Myklebust | 14546c3 | 2012-05-06 19:10:59 -0400 | [diff] [blame] | 155 | /* |
| 156 | * If we're holding a write delegation, then just start the i/o |
| 157 | * but don't wait for completion (or send a commit). |
| 158 | */ |
Bryan Schumaker | 011e2a7 | 2012-06-20 15:53:43 -0400 | [diff] [blame] | 159 | if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) |
Trond Myklebust | 14546c3 | 2012-05-06 19:10:59 -0400 | [diff] [blame] | 160 | return filemap_fdatawrite(file->f_mapping); |
| 161 | |
Trond Myklebust | 7fe5c39 | 2009-03-19 15:35:50 -0400 | [diff] [blame] | 162 | /* Flush writes to the server and return any errors */ |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 163 | return vfs_fsync(file, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 165 | EXPORT_SYMBOL_GPL(nfs_file_flush); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 167 | ssize_t |
Al Viro | 3aa2d19 | 2014-04-02 20:14:12 -0400 | [diff] [blame] | 168 | nfs_file_read(struct kiocb *iocb, struct iov_iter *to) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | { |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 170 | struct inode *inode = file_inode(iocb->ki_filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | ssize_t result; |
| 172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | if (iocb->ki_filp->f_flags & O_DIRECT) |
Al Viro | 3aa2d19 | 2014-04-02 20:14:12 -0400 | [diff] [blame] | 174 | return nfs_file_direct_read(iocb, to, iocb->ki_pos, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | |
Al Viro | 619d30b | 2014-03-04 21:53:33 -0500 | [diff] [blame] | 176 | dprintk("NFS: read(%pD2, %zu@%lu)\n", |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 177 | iocb->ki_filp, |
Al Viro | 3aa2d19 | 2014-04-02 20:14:12 -0400 | [diff] [blame] | 178 | iov_iter_count(to), (unsigned long) iocb->ki_pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
Trond Myklebust | 44b1187 | 2006-05-25 01:40:59 -0400 | [diff] [blame] | 180 | result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); |
Chuck Lever | 4184dcf | 2010-02-01 14:17:23 -0500 | [diff] [blame] | 181 | if (!result) { |
Al Viro | 3aa2d19 | 2014-04-02 20:14:12 -0400 | [diff] [blame] | 182 | result = generic_file_read_iter(iocb, to); |
Chuck Lever | 4184dcf | 2010-02-01 14:17:23 -0500 | [diff] [blame] | 183 | if (result > 0) |
| 184 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result); |
| 185 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | return result; |
| 187 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 188 | EXPORT_SYMBOL_GPL(nfs_file_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 190 | ssize_t |
Jens Axboe | f0930ff | 2007-06-01 11:51:43 +0200 | [diff] [blame] | 191 | nfs_file_splice_read(struct file *filp, loff_t *ppos, |
| 192 | struct pipe_inode_info *pipe, size_t count, |
| 193 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | { |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 195 | struct inode *inode = file_inode(filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | ssize_t res; |
| 197 | |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 198 | dprintk("NFS: splice_read(%pD2, %lu@%Lu)\n", |
| 199 | filp, (unsigned long) count, (unsigned long long) *ppos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
Trond Myklebust | 44b1187 | 2006-05-25 01:40:59 -0400 | [diff] [blame] | 201 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
Chuck Lever | aa2f1ef | 2010-02-01 14:17:32 -0500 | [diff] [blame] | 202 | if (!res) { |
Jens Axboe | f0930ff | 2007-06-01 11:51:43 +0200 | [diff] [blame] | 203 | res = generic_file_splice_read(filp, ppos, pipe, count, flags); |
Chuck Lever | aa2f1ef | 2010-02-01 14:17:32 -0500 | [diff] [blame] | 204 | if (res > 0) |
| 205 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res); |
| 206 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | return res; |
| 208 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 209 | EXPORT_SYMBOL_GPL(nfs_file_splice_read); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 211 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | nfs_file_mmap(struct file * file, struct vm_area_struct * vma) |
| 213 | { |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 214 | struct inode *inode = file_inode(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | int status; |
| 216 | |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 217 | dprintk("NFS: mmap(%pD2)\n", file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | |
Trond Myklebust | e1ebfd3 | 2009-03-11 14:37:54 -0400 | [diff] [blame] | 219 | /* Note: generic_file_mmap() returns ENOSYS on nommu systems |
| 220 | * so we call that before revalidating the mapping |
| 221 | */ |
| 222 | status = generic_file_mmap(file, vma); |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 223 | if (!status) { |
| 224 | vma->vm_ops = &nfs_file_vm_ops; |
Trond Myklebust | e1ebfd3 | 2009-03-11 14:37:54 -0400 | [diff] [blame] | 225 | status = nfs_revalidate_mapping(inode, file->f_mapping); |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 226 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | return status; |
| 228 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 229 | EXPORT_SYMBOL_GPL(nfs_file_mmap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | |
| 231 | /* |
| 232 | * Flush any dirty pages for this process, and check for write errors. |
| 233 | * The return status from this call provides a reliable indication of |
| 234 | * whether any write errors occurred for this process. |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 235 | * |
| 236 | * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to |
| 237 | * disk, but it retrieves and clears ctx->error after synching, despite |
| 238 | * the two being set at the same time in nfs_context_set_write_error(). |
| 239 | * 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] | 240 | * 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] | 241 | * fall back to doing a synchronous write. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | */ |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 243 | int |
Bryan Schumaker | a5c5889 | 2012-06-20 15:53:42 -0400 | [diff] [blame] | 244 | 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] | 245 | { |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 246 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 247 | struct inode *inode = file_inode(file); |
Trond Myklebust | 05990d1 | 2012-09-11 16:01:22 -0400 | [diff] [blame] | 248 | int have_error, do_resend, status; |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 249 | int ret = 0; |
| 250 | |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 251 | dprintk("NFS: fsync file(%pD2) datasync %d\n", file, datasync); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 253 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
Trond Myklebust | 05990d1 | 2012-09-11 16:01:22 -0400 | [diff] [blame] | 254 | do_resend = test_and_clear_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags); |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 255 | have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); |
| 256 | status = nfs_commit_inode(inode, FLUSH_SYNC); |
| 257 | have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); |
Trond Myklebust | 05990d1 | 2012-09-11 16:01:22 -0400 | [diff] [blame] | 258 | if (have_error) { |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 259 | ret = xchg(&ctx->error, 0); |
Trond Myklebust | 05990d1 | 2012-09-11 16:01:22 -0400 | [diff] [blame] | 260 | if (ret) |
| 261 | goto out; |
| 262 | } |
| 263 | if (status < 0) { |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 264 | ret = status; |
Trond Myklebust | 05990d1 | 2012-09-11 16:01:22 -0400 | [diff] [blame] | 265 | goto out; |
| 266 | } |
| 267 | do_resend |= test_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags); |
| 268 | if (do_resend) |
| 269 | ret = -EAGAIN; |
| 270 | out: |
Bryan Schumaker | a5c5889 | 2012-06-20 15:53:42 -0400 | [diff] [blame] | 271 | return ret; |
| 272 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 273 | EXPORT_SYMBOL_GPL(nfs_file_fsync_commit); |
Bryan Schumaker | a5c5889 | 2012-06-20 15:53:42 -0400 | [diff] [blame] | 274 | |
| 275 | static int |
| 276 | nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
| 277 | { |
| 278 | int ret; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 279 | struct inode *inode = file_inode(file); |
Bryan Schumaker | a5c5889 | 2012-06-20 15:53:42 -0400 | [diff] [blame] | 280 | |
Trond Myklebust | f4ce129 | 2013-08-19 18:59:33 -0400 | [diff] [blame] | 281 | trace_nfs_fsync_enter(inode); |
| 282 | |
Trond Myklebust | 05990d1 | 2012-09-11 16:01:22 -0400 | [diff] [blame] | 283 | do { |
| 284 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); |
| 285 | if (ret != 0) |
| 286 | break; |
| 287 | mutex_lock(&inode->i_mutex); |
| 288 | ret = nfs_file_fsync_commit(file, start, end, datasync); |
| 289 | mutex_unlock(&inode->i_mutex); |
Trond Myklebust | dcfc4f2 | 2012-09-11 16:19:38 -0400 | [diff] [blame] | 290 | /* |
| 291 | * If nfs_file_fsync_commit detected a server reboot, then |
| 292 | * resend all dirty pages that might have been covered by |
| 293 | * the NFS_CONTEXT_RESEND_WRITES flag |
| 294 | */ |
| 295 | start = 0; |
| 296 | end = LLONG_MAX; |
Trond Myklebust | 05990d1 | 2012-09-11 16:01:22 -0400 | [diff] [blame] | 297 | } while (ret == -EAGAIN); |
| 298 | |
Trond Myklebust | f4ce129 | 2013-08-19 18:59:33 -0400 | [diff] [blame] | 299 | trace_nfs_fsync_exit(inode, ret); |
Trond Myklebust | af7fa16 | 2010-07-31 14:29:06 -0400 | [diff] [blame] | 300 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | } |
| 302 | |
| 303 | /* |
Peter Staubach | 38c7304 | 2009-08-10 08:54:16 -0400 | [diff] [blame] | 304 | * Decide whether a read/modify/write cycle may be more efficient |
| 305 | * then a modify/write/read cycle when writing to a page in the |
| 306 | * page cache. |
| 307 | * |
| 308 | * The modify/write/read cycle may occur if a page is read before |
| 309 | * being completely filled by the writer. In this situation, the |
| 310 | * page must be completely written to stable storage on the server |
| 311 | * before it can be refilled by reading in the page from the server. |
| 312 | * This can lead to expensive, small, FILE_SYNC mode writes being |
| 313 | * done. |
| 314 | * |
| 315 | * It may be more efficient to read the page first if the file is |
| 316 | * open for reading in addition to writing, the page is not marked |
| 317 | * as Uptodate, it is not dirty or waiting to be committed, |
| 318 | * indicating that it was previously allocated and then modified, |
| 319 | * that there were valid bytes of data in that range of the file, |
| 320 | * and that the new data won't completely replace the old data in |
| 321 | * that range of the file. |
| 322 | */ |
| 323 | static int nfs_want_read_modify_write(struct file *file, struct page *page, |
| 324 | loff_t pos, unsigned len) |
| 325 | { |
| 326 | unsigned int pglen = nfs_page_length(page); |
| 327 | unsigned int offset = pos & (PAGE_CACHE_SIZE - 1); |
| 328 | unsigned int end = offset + len; |
| 329 | |
| 330 | if ((file->f_mode & FMODE_READ) && /* open for read? */ |
| 331 | !PageUptodate(page) && /* Uptodate? */ |
| 332 | !PagePrivate(page) && /* i/o request already? */ |
| 333 | pglen && /* valid bytes of file? */ |
| 334 | (end < pglen || offset)) /* replace all valid bytes? */ |
| 335 | return 1; |
| 336 | return 0; |
| 337 | } |
| 338 | |
| 339 | /* |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 340 | * This does the "real" work of the write. We must allocate and lock the |
| 341 | * page to be sent back to the generic routine, which then copies the |
| 342 | * data from user space. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | * |
| 344 | * If the writer ends up delaying the write, the writer needs to |
| 345 | * increment the page use counts until he is done with the page. |
| 346 | */ |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 347 | static int nfs_write_begin(struct file *file, struct address_space *mapping, |
| 348 | loff_t pos, unsigned len, unsigned flags, |
| 349 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | { |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 351 | int ret; |
Peter Staubach | 38c7304 | 2009-08-10 08:54:16 -0400 | [diff] [blame] | 352 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 353 | struct page *page; |
Peter Staubach | 38c7304 | 2009-08-10 08:54:16 -0400 | [diff] [blame] | 354 | int once_thru = 0; |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 355 | |
Niels de Vos | 1e8968c | 2013-12-17 18:20:16 +0100 | [diff] [blame] | 356 | dfprintk(PAGECACHE, "NFS: write_begin(%pD2(%lu), %u@%lld)\n", |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 357 | file, mapping->host->i_ino, len, (long long) pos); |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 358 | |
Peter Staubach | 38c7304 | 2009-08-10 08:54:16 -0400 | [diff] [blame] | 359 | start: |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 360 | /* |
| 361 | * Prevent starvation issues if someone is doing a consistency |
| 362 | * sync-to-disk |
| 363 | */ |
NeilBrown | 7431620 | 2014-07-07 15:16:04 +1000 | [diff] [blame] | 364 | ret = wait_on_bit_action(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING, |
| 365 | nfs_wait_bit_killable, TASK_KILLABLE); |
Trond Myklebust | 72cb77f | 2009-03-11 14:10:30 -0400 | [diff] [blame] | 366 | if (ret) |
| 367 | return ret; |
| 368 | |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 369 | page = grab_cache_page_write_begin(mapping, index, flags); |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 370 | if (!page) |
| 371 | return -ENOMEM; |
| 372 | *pagep = page; |
| 373 | |
| 374 | ret = nfs_flush_incompatible(file, page); |
| 375 | if (ret) { |
| 376 | unlock_page(page); |
| 377 | page_cache_release(page); |
Peter Staubach | 38c7304 | 2009-08-10 08:54:16 -0400 | [diff] [blame] | 378 | } else if (!once_thru && |
| 379 | nfs_want_read_modify_write(file, page, pos, len)) { |
| 380 | once_thru = 1; |
| 381 | ret = nfs_readpage(file, page); |
| 382 | page_cache_release(page); |
| 383 | if (!ret) |
| 384 | goto start; |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 385 | } |
| 386 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | } |
| 388 | |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 389 | static int nfs_write_end(struct file *file, struct address_space *mapping, |
| 390 | loff_t pos, unsigned len, unsigned copied, |
| 391 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | { |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 393 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
Andy Adamson | dc24826 | 2013-08-14 11:59:16 -0400 | [diff] [blame] | 394 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 395 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | |
Niels de Vos | 1e8968c | 2013-12-17 18:20:16 +0100 | [diff] [blame] | 397 | dfprintk(PAGECACHE, "NFS: write_end(%pD2(%lu), %u@%lld)\n", |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 398 | file, mapping->host->i_ino, len, (long long) pos); |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 399 | |
Trond Myklebust | efc91ed | 2008-06-10 18:31:00 -0400 | [diff] [blame] | 400 | /* |
| 401 | * Zero any uninitialised parts of the page, and then mark the page |
| 402 | * as up to date if it turns out that we're extending the file. |
| 403 | */ |
| 404 | if (!PageUptodate(page)) { |
| 405 | unsigned pglen = nfs_page_length(page); |
| 406 | unsigned end = offset + len; |
| 407 | |
| 408 | if (pglen == 0) { |
| 409 | zero_user_segments(page, 0, offset, |
| 410 | end, PAGE_CACHE_SIZE); |
| 411 | SetPageUptodate(page); |
| 412 | } else if (end >= pglen) { |
| 413 | zero_user_segment(page, end, PAGE_CACHE_SIZE); |
| 414 | if (offset == 0) |
| 415 | SetPageUptodate(page); |
| 416 | } else |
| 417 | zero_user_segment(page, pglen, PAGE_CACHE_SIZE); |
| 418 | } |
| 419 | |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 420 | status = nfs_updatepage(file, page, offset, copied); |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 421 | |
| 422 | unlock_page(page); |
| 423 | page_cache_release(page); |
| 424 | |
Chuck Lever | 3d509e5 | 2007-12-20 14:55:04 -0500 | [diff] [blame] | 425 | if (status < 0) |
| 426 | return status; |
Andy Adamson | 2701d08 | 2012-05-24 13:13:24 -0400 | [diff] [blame] | 427 | NFS_I(mapping->host)->write_io += copied; |
Andy Adamson | dc24826 | 2013-08-14 11:59:16 -0400 | [diff] [blame] | 428 | |
| 429 | if (nfs_ctx_key_to_expire(ctx)) { |
| 430 | status = nfs_wb_all(mapping->host); |
| 431 | if (status < 0) |
| 432 | return status; |
| 433 | } |
| 434 | |
Chuck Lever | 3d509e5 | 2007-12-20 14:55:04 -0500 | [diff] [blame] | 435 | return copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | } |
| 437 | |
David Howells | 6b9b351 | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 438 | /* |
| 439 | * Partially or wholly invalidate a page |
| 440 | * - Release the private state associated with a page if undergoing complete |
| 441 | * page invalidation |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 442 | * - 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] | 443 | * - Caller holds page lock |
| 444 | */ |
Lukas Czerner | d47992f | 2013-05-21 23:17:23 -0400 | [diff] [blame] | 445 | static void nfs_invalidate_page(struct page *page, unsigned int offset, |
| 446 | unsigned int length) |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 447 | { |
Lukas Czerner | d47992f | 2013-05-21 23:17:23 -0400 | [diff] [blame] | 448 | dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %u, %u)\n", |
| 449 | page, offset, length); |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 450 | |
Lukas Czerner | d47992f | 2013-05-21 23:17:23 -0400 | [diff] [blame] | 451 | if (offset != 0 || length < PAGE_CACHE_SIZE) |
Trond Myklebust | 1c75950 | 2006-10-09 16:18:38 -0400 | [diff] [blame] | 452 | return; |
Trond Myklebust | d2ccddf | 2006-05-31 01:13:38 -0400 | [diff] [blame] | 453 | /* Cancel any unstarted writes on this page */ |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 454 | nfs_wb_page_cancel(page_file_mapping(page)->host, page); |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 455 | |
| 456 | nfs_fscache_invalidate_page(page, page->mapping->host); |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 457 | } |
| 458 | |
David Howells | 6b9b351 | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 459 | /* |
| 460 | * Attempt to release the private state associated with a page |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 461 | * - 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] | 462 | * - Caller holds page lock |
| 463 | * - Return true (may release page) or false (may not) |
| 464 | */ |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 465 | static int nfs_release_page(struct page *page, gfp_t gfp) |
| 466 | { |
Trond Myklebust | b608b28 | 2010-07-30 15:31:54 -0400 | [diff] [blame] | 467 | struct address_space *mapping = page->mapping; |
| 468 | |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 469 | dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page); |
| 470 | |
Jeff Layton | 5cf02d0 | 2012-07-23 13:58:51 -0400 | [diff] [blame] | 471 | /* Only do I/O if gfp is a superset of GFP_KERNEL, and we're not |
| 472 | * doing this memory reclaim for a fs-related allocation. |
| 473 | */ |
| 474 | if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL && |
| 475 | !(current->flags & PF_FSTRANS)) { |
Trond Myklebust | b608b28 | 2010-07-30 15:31:54 -0400 | [diff] [blame] | 476 | int how = FLUSH_SYNC; |
| 477 | |
| 478 | /* Don't let kswapd deadlock waiting for OOM RPC calls */ |
| 479 | if (current_is_kswapd()) |
| 480 | how = 0; |
| 481 | nfs_commit_inode(mapping->host, how); |
| 482 | } |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 483 | /* If PagePrivate() is set, then the page is not freeable */ |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 484 | if (PagePrivate(page)) |
| 485 | return 0; |
| 486 | return nfs_fscache_release_page(page, gfp); |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 487 | } |
| 488 | |
Mel Gorman | f919b19 | 2013-07-03 15:02:06 -0700 | [diff] [blame] | 489 | static void nfs_check_dirty_writeback(struct page *page, |
| 490 | bool *dirty, bool *writeback) |
| 491 | { |
| 492 | struct nfs_inode *nfsi; |
| 493 | struct address_space *mapping = page_file_mapping(page); |
| 494 | |
| 495 | if (!mapping || PageSwapCache(page)) |
| 496 | return; |
| 497 | |
| 498 | /* |
| 499 | * Check if an unstable page is currently being committed and |
| 500 | * if so, have the VM treat it as if the page is under writeback |
| 501 | * so it will not block due to pages that will shortly be freeable. |
| 502 | */ |
| 503 | nfsi = NFS_I(mapping->host); |
| 504 | if (test_bit(NFS_INO_COMMIT, &nfsi->flags)) { |
| 505 | *writeback = true; |
| 506 | return; |
| 507 | } |
| 508 | |
| 509 | /* |
| 510 | * If PagePrivate() is set, then the page is not freeable and as the |
| 511 | * inode is not being committed, it's not going to be cleaned in the |
| 512 | * near future so treat it as dirty |
| 513 | */ |
| 514 | if (PagePrivate(page)) |
| 515 | *dirty = true; |
| 516 | } |
| 517 | |
David Howells | 6b9b351 | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 518 | /* |
| 519 | * Attempt to clear the private state associated with a page when an error |
| 520 | * occurs that requires the cached contents of an inode to be written back or |
| 521 | * destroyed |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 522 | * - Called if either PG_private or fscache is set on the page |
David Howells | 6b9b351 | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 523 | * - Caller holds page lock |
| 524 | * - Return 0 if successful, -error otherwise |
| 525 | */ |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 526 | static int nfs_launder_page(struct page *page) |
| 527 | { |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 528 | struct inode *inode = page_file_mapping(page)->host; |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 529 | struct nfs_inode *nfsi = NFS_I(inode); |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 530 | |
| 531 | dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n", |
| 532 | inode->i_ino, (long long)page_offset(page)); |
| 533 | |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 534 | nfs_fscache_wait_on_page_write(nfsi, page); |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 535 | return nfs_wb_page(inode, page); |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 536 | } |
| 537 | |
Mel Gorman | a564b8f | 2012-07-31 16:45:12 -0700 | [diff] [blame] | 538 | #ifdef CONFIG_NFS_SWAP |
| 539 | static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file, |
| 540 | sector_t *span) |
| 541 | { |
| 542 | *span = sis->pages; |
| 543 | return xs_swapper(NFS_CLIENT(file->f_mapping->host)->cl_xprt, 1); |
| 544 | } |
| 545 | |
| 546 | static void nfs_swap_deactivate(struct file *file) |
| 547 | { |
| 548 | xs_swapper(NFS_CLIENT(file->f_mapping->host)->cl_xprt, 0); |
| 549 | } |
| 550 | #endif |
| 551 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 552 | const struct address_space_operations nfs_file_aops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | .readpage = nfs_readpage, |
| 554 | .readpages = nfs_readpages, |
Trond Myklebust | 9cccef9 | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 555 | .set_page_dirty = __set_page_dirty_nobuffers, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | .writepage = nfs_writepage, |
| 557 | .writepages = nfs_writepages, |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 558 | .write_begin = nfs_write_begin, |
| 559 | .write_end = nfs_write_end, |
Trond Myklebust | cd52ed3 | 2006-03-20 13:44:04 -0500 | [diff] [blame] | 560 | .invalidatepage = nfs_invalidate_page, |
| 561 | .releasepage = nfs_release_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | .direct_IO = nfs_direct_IO, |
Trond Myklebust | 074cc1d | 2009-08-10 08:54:13 -0400 | [diff] [blame] | 563 | .migratepage = nfs_migrate_page, |
Trond Myklebust | e3db769 | 2007-01-10 23:15:39 -0800 | [diff] [blame] | 564 | .launder_page = nfs_launder_page, |
Mel Gorman | f919b19 | 2013-07-03 15:02:06 -0700 | [diff] [blame] | 565 | .is_dirty_writeback = nfs_check_dirty_writeback, |
Andi Kleen | f590f33 | 2009-09-16 11:50:17 +0200 | [diff] [blame] | 566 | .error_remove_page = generic_error_remove_page, |
Mel Gorman | a564b8f | 2012-07-31 16:45:12 -0700 | [diff] [blame] | 567 | #ifdef CONFIG_NFS_SWAP |
| 568 | .swap_activate = nfs_swap_activate, |
| 569 | .swap_deactivate = nfs_swap_deactivate, |
| 570 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | }; |
| 572 | |
David Howells | 6b9b351 | 2009-04-03 16:42:41 +0100 | [diff] [blame] | 573 | /* |
| 574 | * Notification that a PTE pointing to an NFS page is about to be made |
| 575 | * writable, implying that someone is about to modify the page through a |
| 576 | * shared-writable mapping |
| 577 | */ |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 578 | 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] | 579 | { |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 580 | struct page *page = vmf->page; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 581 | struct file *filp = vma->vm_file; |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 582 | struct inode *inode = file_inode(filp); |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 583 | unsigned pagelen; |
Trond Myklebust | bc4866b | 2010-10-04 17:59:08 -0400 | [diff] [blame] | 584 | int ret = VM_FAULT_NOPAGE; |
Nick Piggin | 4899f9c | 2007-10-16 01:25:16 -0700 | [diff] [blame] | 585 | struct address_space *mapping; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 586 | |
Niels de Vos | 1e8968c | 2013-12-17 18:20:16 +0100 | [diff] [blame] | 587 | dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%pD2(%lu), offset %lld)\n", |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 588 | filp, filp->f_mapping->host->i_ino, |
Chuck Lever | b7eaefa | 2008-06-11 17:55:50 -0400 | [diff] [blame] | 589 | (long long)page_offset(page)); |
| 590 | |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 591 | /* make sure the cache has finished storing the page */ |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 592 | nfs_fscache_wait_on_page_write(NFS_I(inode), page); |
David Howells | 545db45 | 2009-04-03 16:42:44 +0100 | [diff] [blame] | 593 | |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 594 | lock_page(page); |
Mel Gorman | d56b4dd | 2012-07-31 16:45:06 -0700 | [diff] [blame] | 595 | mapping = page_file_mapping(page); |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 596 | if (mapping != inode->i_mapping) |
Trond Myklebust | 8b1f9ee | 2008-01-22 17:13:06 -0500 | [diff] [blame] | 597 | goto out_unlock; |
| 598 | |
Trond Myklebust | 2aeb98f | 2012-01-17 22:04:26 -0500 | [diff] [blame] | 599 | wait_on_page_writeback(page); |
| 600 | |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 601 | pagelen = nfs_page_length(page); |
Trond Myklebust | 8b1f9ee | 2008-01-22 17:13:06 -0500 | [diff] [blame] | 602 | if (pagelen == 0) |
| 603 | goto out_unlock; |
| 604 | |
Trond Myklebust | bc4866b | 2010-10-04 17:59:08 -0400 | [diff] [blame] | 605 | ret = VM_FAULT_LOCKED; |
| 606 | if (nfs_flush_incompatible(filp, page) == 0 && |
| 607 | nfs_updatepage(filp, page, 0, pagelen) == 0) |
| 608 | goto out; |
Trond Myklebust | 8b1f9ee | 2008-01-22 17:13:06 -0500 | [diff] [blame] | 609 | |
Trond Myklebust | bc4866b | 2010-10-04 17:59:08 -0400 | [diff] [blame] | 610 | ret = VM_FAULT_SIGBUS; |
Trond Myklebust | 8b1f9ee | 2008-01-22 17:13:06 -0500 | [diff] [blame] | 611 | out_unlock: |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 612 | unlock_page(page); |
Trond Myklebust | bc4866b | 2010-10-04 17:59:08 -0400 | [diff] [blame] | 613 | out: |
| 614 | return ret; |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 615 | } |
| 616 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 617 | static const struct vm_operations_struct nfs_file_vm_ops = { |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 618 | .fault = filemap_fault, |
Kirill A. Shutemov | f182036 | 2014-04-07 15:37:19 -0700 | [diff] [blame] | 619 | .map_pages = filemap_map_pages, |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 620 | .page_mkwrite = nfs_vm_page_mkwrite, |
Konstantin Khlebnikov | 0b173bc | 2012-10-08 16:28:46 -0700 | [diff] [blame] | 621 | .remap_pages = generic_file_remap_pages, |
Trond Myklebust | 94387fb | 2007-07-22 17:09:05 -0400 | [diff] [blame] | 622 | }; |
| 623 | |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 624 | static int nfs_need_sync_write(struct file *filp, struct inode *inode) |
| 625 | { |
| 626 | struct nfs_open_context *ctx; |
| 627 | |
Christoph Hellwig | 6b2f3d1 | 2009-10-27 11:05:28 +0100 | [diff] [blame] | 628 | if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC)) |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 629 | return 1; |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 630 | ctx = nfs_file_open_context(filp); |
Andy Adamson | dc24826 | 2013-08-14 11:59:16 -0400 | [diff] [blame] | 631 | if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags) || |
| 632 | nfs_ctx_key_to_expire(ctx)) |
Trond Myklebust | 7b159fc | 2007-07-25 14:09:54 -0400 | [diff] [blame] | 633 | return 1; |
| 634 | return 0; |
| 635 | } |
| 636 | |
Al Viro | edaf436 | 2014-04-03 14:07:25 -0400 | [diff] [blame] | 637 | ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | { |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 639 | struct file *file = iocb->ki_filp; |
| 640 | struct inode *inode = file_inode(file); |
Chuck Lever | 7e38117 | 2010-02-01 14:17:41 -0500 | [diff] [blame] | 641 | unsigned long written = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | ssize_t result; |
Al Viro | edaf436 | 2014-04-03 14:07:25 -0400 | [diff] [blame] | 643 | size_t count = iov_iter_count(from); |
| 644 | loff_t pos = iocb->ki_pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 646 | result = nfs_key_timeout_notify(file, inode); |
Andy Adamson | dc24826 | 2013-08-14 11:59:16 -0400 | [diff] [blame] | 647 | if (result) |
| 648 | return result; |
| 649 | |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 650 | if (file->f_flags & O_DIRECT) |
Al Viro | edaf436 | 2014-04-03 14:07:25 -0400 | [diff] [blame] | 651 | return nfs_file_direct_write(iocb, from, pos, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | |
Al Viro | 619d30b | 2014-03-04 21:53:33 -0500 | [diff] [blame] | 653 | dprintk("NFS: write(%pD2, %zu@%Ld)\n", |
| 654 | file, count, (long long) pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | |
| 656 | result = -EBUSY; |
| 657 | if (IS_SWAPFILE(inode)) |
| 658 | goto out_swapfile; |
Trond Myklebust | 7d52e86 | 2005-06-22 17:16:30 +0000 | [diff] [blame] | 659 | /* |
| 660 | * O_APPEND implies that we must revalidate the file length. |
| 661 | */ |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 662 | if (file->f_flags & O_APPEND) { |
| 663 | result = nfs_revalidate_file_size(inode, file); |
Trond Myklebust | 7d52e86 | 2005-06-22 17:16:30 +0000 | [diff] [blame] | 664 | if (result) |
| 665 | goto out; |
Trond Myklebust | fe51beec | 2005-06-22 17:16:30 +0000 | [diff] [blame] | 666 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | |
| 668 | result = count; |
| 669 | if (!count) |
| 670 | goto out; |
| 671 | |
Al Viro | edaf436 | 2014-04-03 14:07:25 -0400 | [diff] [blame] | 672 | result = generic_file_write_iter(iocb, from); |
Chuck Lever | 7e38117 | 2010-02-01 14:17:41 -0500 | [diff] [blame] | 673 | if (result > 0) |
| 674 | written = result; |
| 675 | |
Christoph Hellwig | 6b2f3d1 | 2009-10-27 11:05:28 +0100 | [diff] [blame] | 676 | /* Return error values for O_DSYNC and IS_SYNC() */ |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 677 | if (result >= 0 && nfs_need_sync_write(file, inode)) { |
| 678 | int err = vfs_fsync(file, 0); |
Trond Myklebust | 200baa2 | 2006-12-05 00:35:40 -0500 | [diff] [blame] | 679 | if (err < 0) |
| 680 | result = err; |
| 681 | } |
Chuck Lever | 7e38117 | 2010-02-01 14:17:41 -0500 | [diff] [blame] | 682 | if (result > 0) |
| 683 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | out: |
| 685 | return result; |
| 686 | |
| 687 | out_swapfile: |
| 688 | printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); |
| 689 | goto out; |
| 690 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 691 | EXPORT_SYMBOL_GPL(nfs_file_write); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 693 | static int |
| 694 | 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] | 695 | { |
| 696 | struct inode *inode = filp->f_mapping->host; |
| 697 | int status = 0; |
Sergey Vlasov | 21ac19d | 2010-11-28 21:04:05 +0000 | [diff] [blame] | 698 | unsigned int saved_type = fl->fl_type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 700 | /* Try local locking first */ |
J. Bruce Fields | 6d34ac1 | 2007-05-11 16:09:32 -0400 | [diff] [blame] | 701 | posix_test_lock(filp, fl); |
| 702 | if (fl->fl_type != F_UNLCK) { |
| 703 | /* found a conflict */ |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 704 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | } |
Sergey Vlasov | 21ac19d | 2010-11-28 21:04:05 +0000 | [diff] [blame] | 706 | fl->fl_type = saved_type; |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 707 | |
Bryan Schumaker | 011e2a7 | 2012-06-20 15:53:43 -0400 | [diff] [blame] | 708 | if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 709 | goto out_noconflict; |
| 710 | |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 711 | if (is_local) |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 712 | goto out_noconflict; |
| 713 | |
| 714 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
| 715 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | return status; |
Trond Myklebust | 039c4d7 | 2005-10-18 14:20:16 -0700 | [diff] [blame] | 717 | out_noconflict: |
| 718 | fl->fl_type = F_UNLCK; |
| 719 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | } |
| 721 | |
| 722 | static int do_vfs_lock(struct file *file, struct file_lock *fl) |
| 723 | { |
| 724 | int res = 0; |
| 725 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { |
| 726 | case FL_POSIX: |
| 727 | res = posix_lock_file_wait(file, fl); |
| 728 | break; |
| 729 | case FL_FLOCK: |
| 730 | res = flock_lock_file_wait(file, fl); |
| 731 | break; |
| 732 | default: |
| 733 | BUG(); |
| 734 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | return res; |
| 736 | } |
| 737 | |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 738 | static int |
| 739 | 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] | 740 | { |
| 741 | struct inode *inode = filp->f_mapping->host; |
Trond Myklebust | 7a8203d | 2013-04-08 21:49:53 -0400 | [diff] [blame] | 742 | struct nfs_lock_context *l_ctx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | int status; |
| 744 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | /* |
| 746 | * Flush all pending writes before doing anything |
| 747 | * with locks.. |
| 748 | */ |
Trond Myklebust | 29884df | 2005-12-13 16:13:54 -0500 | [diff] [blame] | 749 | nfs_sync_mapping(filp->f_mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | |
Trond Myklebust | 7a8203d | 2013-04-08 21:49:53 -0400 | [diff] [blame] | 751 | l_ctx = nfs_get_lock_context(nfs_file_open_context(filp)); |
| 752 | if (!IS_ERR(l_ctx)) { |
| 753 | status = nfs_iocounter_wait(&l_ctx->io_count); |
| 754 | nfs_put_lock_context(l_ctx); |
| 755 | if (status < 0) |
| 756 | return status; |
| 757 | } |
| 758 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | /* NOTE: special case |
| 760 | * If we're signalled while cleaning up locks on process exit, we |
| 761 | * still need to complete the unlock. |
| 762 | */ |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 763 | /* |
| 764 | * Use local locking if mounted with "-onolock" or with appropriate |
| 765 | * "-olocal_lock=" |
| 766 | */ |
| 767 | if (!is_local) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
| 769 | else |
| 770 | status = do_vfs_lock(filp, fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | return status; |
| 772 | } |
| 773 | |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 774 | static int |
Ricardo Labiaga | 6b96724 | 2010-10-12 16:30:05 -0700 | [diff] [blame] | 775 | is_time_granular(struct timespec *ts) { |
| 776 | return ((ts->tv_sec == 0) && (ts->tv_nsec <= 1000)); |
| 777 | } |
| 778 | |
| 779 | static int |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 780 | 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] | 781 | { |
| 782 | struct inode *inode = filp->f_mapping->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | int status; |
| 784 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | /* |
| 786 | * Flush all pending writes before doing anything |
| 787 | * with locks.. |
| 788 | */ |
Trond Myklebust | 29884df | 2005-12-13 16:13:54 -0500 | [diff] [blame] | 789 | status = nfs_sync_mapping(filp->f_mapping); |
| 790 | if (status != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 791 | goto out; |
| 792 | |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 793 | /* |
| 794 | * Use local locking if mounted with "-onolock" or with appropriate |
| 795 | * "-olocal_lock=" |
| 796 | */ |
| 797 | if (!is_local) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
Trond Myklebust | c4d7c40 | 2008-04-01 20:26:52 -0400 | [diff] [blame] | 799 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | status = do_vfs_lock(filp, fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | if (status < 0) |
| 802 | goto out; |
Ricardo Labiaga | 6b96724 | 2010-10-12 16:30:05 -0700 | [diff] [blame] | 803 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | /* |
Ricardo Labiaga | 6b96724 | 2010-10-12 16:30:05 -0700 | [diff] [blame] | 805 | * Revalidate the cache if the server has time stamps granular |
| 806 | * enough to detect subsecond changes. Otherwise, clear the |
| 807 | * cache to prevent missing any changes. |
| 808 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | * This makes locking act as a cache coherency point. |
| 810 | */ |
Trond Myklebust | 29884df | 2005-12-13 16:13:54 -0500 | [diff] [blame] | 811 | nfs_sync_mapping(filp->f_mapping); |
Bryan Schumaker | 011e2a7 | 2012-06-20 15:53:43 -0400 | [diff] [blame] | 812 | if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) { |
Ricardo Labiaga | 6b96724 | 2010-10-12 16:30:05 -0700 | [diff] [blame] | 813 | if (is_time_granular(&NFS_SERVER(inode)->time_delta)) |
| 814 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| 815 | else |
| 816 | nfs_zap_caches(inode); |
| 817 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | return status; |
| 820 | } |
| 821 | |
| 822 | /* |
| 823 | * Lock a (portion of) a file |
| 824 | */ |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 825 | int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | { |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 827 | struct inode *inode = filp->f_mapping->host; |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 828 | int ret = -ENOLCK; |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 829 | int is_local = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 831 | dprintk("NFS: lock(%pD2, t=%x, fl=%x, r=%lld:%lld)\n", |
| 832 | filp, fl->fl_type, fl->fl_flags, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | (long long)fl->fl_start, (long long)fl->fl_end); |
Chuck Lever | 6da24bc | 2008-06-11 17:55:58 -0400 | [diff] [blame] | 834 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 835 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
| 837 | /* No mandatory locks over NFS */ |
Pavel Emelyanov | dfad944 | 2007-10-01 14:41:15 -0700 | [diff] [blame] | 838 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 839 | goto out_err; |
| 840 | |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 841 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL) |
| 842 | is_local = 1; |
| 843 | |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 844 | if (NFS_PROTO(inode)->lock_check_bounds != NULL) { |
| 845 | ret = NFS_PROTO(inode)->lock_check_bounds(fl); |
| 846 | if (ret < 0) |
| 847 | goto out_err; |
| 848 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | |
| 850 | if (IS_GETLK(cmd)) |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 851 | ret = do_getlk(filp, cmd, fl, is_local); |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 852 | else if (fl->fl_type == F_UNLCK) |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 853 | ret = do_unlk(filp, cmd, fl, is_local); |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 854 | else |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 855 | ret = do_setlk(filp, cmd, fl, is_local); |
Trond Myklebust | 2116271 | 2008-05-20 19:34:39 -0400 | [diff] [blame] | 856 | out_err: |
| 857 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 859 | EXPORT_SYMBOL_GPL(nfs_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
| 861 | /* |
| 862 | * Lock a (portion of) a file |
| 863 | */ |
Bryan Schumaker | ce4ef7c | 2012-07-16 16:39:15 -0400 | [diff] [blame] | 864 | int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | { |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 866 | struct inode *inode = filp->f_mapping->host; |
| 867 | int is_local = 0; |
| 868 | |
Al Viro | 6de1472 | 2013-09-16 10:53:17 -0400 | [diff] [blame] | 869 | dprintk("NFS: flock(%pD2, t=%x, fl=%x)\n", |
| 870 | filp, fl->fl_type, fl->fl_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | if (!(fl->fl_flags & FL_FLOCK)) |
| 873 | return -ENOLCK; |
| 874 | |
Jeff Layton | ad0fcd4 | 2012-07-23 15:46:23 -0400 | [diff] [blame] | 875 | /* |
| 876 | * The NFSv4 protocol doesn't support LOCK_MAND, which is not part of |
| 877 | * any standard. In principle we might be able to support LOCK_MAND |
| 878 | * on NFSv2/3 since NLMv3/4 support DOS share modes, but for now the |
| 879 | * NFS code is not set up for it. |
| 880 | */ |
| 881 | if (fl->fl_type & LOCK_MAND) |
| 882 | return -EINVAL; |
| 883 | |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 884 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK) |
| 885 | is_local = 1; |
| 886 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | /* We're simulating flock() locks using posix locks on the server */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | if (fl->fl_type == F_UNLCK) |
Suresh Jayaraman | 5eebde2 | 2010-09-23 08:55:58 -0400 | [diff] [blame] | 889 | return do_unlk(filp, cmd, fl, is_local); |
| 890 | return do_setlk(filp, cmd, fl, is_local); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | } |
Bryan Schumaker | 89d77c8 | 2012-07-30 16:05:25 -0400 | [diff] [blame] | 892 | EXPORT_SYMBOL_GPL(nfs_flock); |
J. Bruce Fields | 370f659 | 2007-06-08 15:23:34 -0400 | [diff] [blame] | 893 | |
Jeff Layton | 0486958 | 2011-11-04 13:31:22 -0400 | [diff] [blame] | 894 | const struct file_operations nfs_file_operations = { |
| 895 | .llseek = nfs_file_llseek, |
Al Viro | 3aa2d19 | 2014-04-02 20:14:12 -0400 | [diff] [blame] | 896 | .read = new_sync_read, |
Al Viro | edaf436 | 2014-04-03 14:07:25 -0400 | [diff] [blame] | 897 | .write = new_sync_write, |
Al Viro | 3aa2d19 | 2014-04-02 20:14:12 -0400 | [diff] [blame] | 898 | .read_iter = nfs_file_read, |
Al Viro | edaf436 | 2014-04-03 14:07:25 -0400 | [diff] [blame] | 899 | .write_iter = nfs_file_write, |
Jeff Layton | 0486958 | 2011-11-04 13:31:22 -0400 | [diff] [blame] | 900 | .mmap = nfs_file_mmap, |
| 901 | .open = nfs_file_open, |
| 902 | .flush = nfs_file_flush, |
| 903 | .release = nfs_file_release, |
| 904 | .fsync = nfs_file_fsync, |
| 905 | .lock = nfs_lock, |
| 906 | .flock = nfs_flock, |
| 907 | .splice_read = nfs_file_splice_read, |
Al Viro | 4da54c2 | 2014-04-05 04:37:17 -0400 | [diff] [blame] | 908 | .splice_write = iter_file_splice_write, |
Jeff Layton | 0486958 | 2011-11-04 13:31:22 -0400 | [diff] [blame] | 909 | .check_flags = nfs_check_flags, |
Jeff Layton | 1c994a0 | 2014-08-27 06:49:41 -0400 | [diff] [blame^] | 910 | .setlease = simple_nosetlease, |
Jeff Layton | 0486958 | 2011-11-04 13:31:22 -0400 | [diff] [blame] | 911 | }; |
Bryan Schumaker | ddda8e0 | 2012-07-30 16:05:23 -0400 | [diff] [blame] | 912 | EXPORT_SYMBOL_GPL(nfs_file_operations); |