4 * Copyright (C) 1992 Rick Sladkey
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.
12 * Expire cache on write to a file by Wai S Kok (Oct 1994).
14 * Total rewrite of read side for new NFS buffer cache.. Linus.
16 * nfs regular file handling functions
19 #include <linux/time.h>
20 #include <linux/kernel.h>
21 #include <linux/errno.h>
22 #include <linux/fcntl.h>
23 #include <linux/stat.h>
24 #include <linux/nfs_fs.h>
25 #include <linux/nfs_mount.h>
27 #include <linux/slab.h>
28 #include <linux/pagemap.h>
29 #include <linux/smp_lock.h>
31 #include <asm/uaccess.h>
32 #include <asm/system.h>
34 #include "delegation.h"
36 #define NFSDBG_FACILITY NFSDBG_FILE
38 static int nfs_file_open(struct inode *, struct file *);
39 static int nfs_file_release(struct inode *, struct file *);
40 static int nfs_file_mmap(struct file *, struct vm_area_struct *);
41 static ssize_t nfs_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
42 static ssize_t nfs_file_read(struct kiocb *, char __user *, size_t, loff_t);
43 static ssize_t nfs_file_write(struct kiocb *, const char __user *, size_t, loff_t);
44 static int nfs_file_flush(struct file *);
45 static int nfs_fsync(struct file *, struct dentry *dentry, int datasync);
46 static int nfs_check_flags(int flags);
47 static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl);
48 static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl);
50 struct file_operations nfs_file_operations = {
51 .llseek = remote_llseek,
53 .write = do_sync_write,
54 .aio_read = nfs_file_read,
55 .aio_write = nfs_file_write,
56 .mmap = nfs_file_mmap,
57 .open = nfs_file_open,
58 .flush = nfs_file_flush,
59 .release = nfs_file_release,
63 .sendfile = nfs_file_sendfile,
64 .check_flags = nfs_check_flags,
67 struct inode_operations nfs_file_inode_operations = {
68 .permission = nfs_permission,
69 .getattr = nfs_getattr,
70 .setattr = nfs_setattr,
73 /* Hack for future NFS swap support */
75 # define IS_SWAPFILE(inode) (0)
78 static int nfs_check_flags(int flags)
80 if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT))
90 nfs_file_open(struct inode *inode, struct file *filp)
92 struct nfs_server *server = NFS_SERVER(inode);
93 int (*open)(struct inode *, struct file *);
96 res = nfs_check_flags(filp->f_flags);
101 /* Do NFSv4 open() call */
102 if ((open = server->rpc_ops->file_open) != NULL)
103 res = open(inode, filp);
109 nfs_file_release(struct inode *inode, struct file *filp)
111 /* Ensure that dirty pages are flushed out with the right creds */
112 if (filp->f_mode & FMODE_WRITE)
113 filemap_fdatawrite(filp->f_mapping);
114 return NFS_PROTO(inode)->file_release(inode, filp);
118 * Flush all dirty pages, and check for write errors.
122 nfs_file_flush(struct file *file)
124 struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
125 struct inode *inode = file->f_dentry->d_inode;
128 dfprintk(VFS, "nfs: flush(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
130 if ((file->f_mode & FMODE_WRITE) == 0)
133 /* Ensure that data+attribute caches are up to date after close() */
134 status = nfs_wb_all(inode);
138 if (!status && !nfs_have_delegation(inode, FMODE_READ))
139 __nfs_revalidate_inode(NFS_SERVER(inode), inode);
146 nfs_file_read(struct kiocb *iocb, char __user * buf, size_t count, loff_t pos)
148 struct dentry * dentry = iocb->ki_filp->f_dentry;
149 struct inode * inode = dentry->d_inode;
152 #ifdef CONFIG_NFS_DIRECTIO
153 if (iocb->ki_filp->f_flags & O_DIRECT)
154 return nfs_file_direct_read(iocb, buf, count, pos);
157 dfprintk(VFS, "nfs: read(%s/%s, %lu@%lu)\n",
158 dentry->d_parent->d_name.name, dentry->d_name.name,
159 (unsigned long) count, (unsigned long) pos);
161 result = nfs_revalidate_inode(NFS_SERVER(inode), inode);
163 result = generic_file_aio_read(iocb, buf, count, pos);
168 nfs_file_sendfile(struct file *filp, loff_t *ppos, size_t count,
169 read_actor_t actor, void *target)
171 struct dentry *dentry = filp->f_dentry;
172 struct inode *inode = dentry->d_inode;
175 dfprintk(VFS, "nfs: sendfile(%s/%s, %lu@%Lu)\n",
176 dentry->d_parent->d_name.name, dentry->d_name.name,
177 (unsigned long) count, (unsigned long long) *ppos);
179 res = nfs_revalidate_inode(NFS_SERVER(inode), inode);
181 res = generic_file_sendfile(filp, ppos, count, actor, target);
186 nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
188 struct dentry *dentry = file->f_dentry;
189 struct inode *inode = dentry->d_inode;
192 dfprintk(VFS, "nfs: mmap(%s/%s)\n",
193 dentry->d_parent->d_name.name, dentry->d_name.name);
195 status = nfs_revalidate_inode(NFS_SERVER(inode), inode);
197 status = generic_file_mmap(file, vma);
202 * Flush any dirty pages for this process, and check for write errors.
203 * The return status from this call provides a reliable indication of
204 * whether any write errors occurred for this process.
207 nfs_fsync(struct file *file, struct dentry *dentry, int datasync)
209 struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
210 struct inode *inode = dentry->d_inode;
213 dfprintk(VFS, "nfs: fsync(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
216 status = nfs_wb_all(inode);
226 * This does the "real" work of the write. The generic routine has
227 * allocated the page, locked it, done all the page alignment stuff
228 * calculations etc. Now we should just copy the data from user
229 * space and write it back to the real medium..
231 * If the writer ends up delaying the write, the writer needs to
232 * increment the page use counts until he is done with the page.
234 static int nfs_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
236 return nfs_flush_incompatible(file, page);
239 static int nfs_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to)
244 status = nfs_updatepage(file, page, offset, to-offset);
249 struct address_space_operations nfs_file_aops = {
250 .readpage = nfs_readpage,
251 .readpages = nfs_readpages,
252 .set_page_dirty = __set_page_dirty_nobuffers,
253 .writepage = nfs_writepage,
254 .writepages = nfs_writepages,
255 .prepare_write = nfs_prepare_write,
256 .commit_write = nfs_commit_write,
257 #ifdef CONFIG_NFS_DIRECTIO
258 .direct_IO = nfs_direct_IO,
263 * Write to a file (through the page cache).
266 nfs_file_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t pos)
268 struct dentry * dentry = iocb->ki_filp->f_dentry;
269 struct inode * inode = dentry->d_inode;
272 #ifdef CONFIG_NFS_DIRECTIO
273 if (iocb->ki_filp->f_flags & O_DIRECT)
274 return nfs_file_direct_write(iocb, buf, count, pos);
277 dfprintk(VFS, "nfs: write(%s/%s(%ld), %lu@%lu)\n",
278 dentry->d_parent->d_name.name, dentry->d_name.name,
279 inode->i_ino, (unsigned long) count, (unsigned long) pos);
282 if (IS_SWAPFILE(inode))
284 result = nfs_revalidate_inode(NFS_SERVER(inode), inode);
292 result = generic_file_aio_write(iocb, buf, count, pos);
297 printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
301 static int do_getlk(struct file *filp, int cmd, struct file_lock *fl)
303 struct inode *inode = filp->f_mapping->host;
307 /* Use local locking if mounted with "-onolock" */
308 if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM))
309 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
311 struct file_lock *cfl = posix_test_lock(filp, fl);
313 fl->fl_type = F_UNLCK;
315 memcpy(fl, cfl, sizeof(*fl));
321 static int do_vfs_lock(struct file *file, struct file_lock *fl)
324 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
326 res = posix_lock_file_wait(file, fl);
329 res = flock_lock_file_wait(file, fl);
335 printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
340 static int do_unlk(struct file *filp, int cmd, struct file_lock *fl)
342 struct inode *inode = filp->f_mapping->host;
346 rpc_clnt_sigmask(NFS_CLIENT(inode), &oldset);
348 * Flush all pending writes before doing anything
351 filemap_fdatawrite(filp->f_mapping);
355 filemap_fdatawait(filp->f_mapping);
357 /* NOTE: special case
358 * If we're signalled while cleaning up locks on process exit, we
359 * still need to complete the unlock.
362 /* Use local locking if mounted with "-onolock" */
363 if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM))
364 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
366 status = do_vfs_lock(filp, fl);
368 rpc_clnt_sigunmask(NFS_CLIENT(inode), &oldset);
372 static int do_setlk(struct file *filp, int cmd, struct file_lock *fl)
374 struct inode *inode = filp->f_mapping->host;
378 rpc_clnt_sigmask(NFS_CLIENT(inode), &oldset);
380 * Flush all pending writes before doing anything
383 status = filemap_fdatawrite(filp->f_mapping);
386 status = nfs_wb_all(inode);
389 status = filemap_fdatawait(filp->f_mapping);
395 /* Use local locking if mounted with "-onolock" */
396 if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) {
397 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
398 /* If we were signalled we still need to ensure that
399 * we clean up any state on the server. We therefore
400 * record the lock call as having succeeded in order to
401 * ensure that locks_remove_posix() cleans it out when
404 if (status == -EINTR || status == -ERESTARTSYS)
405 do_vfs_lock(filp, fl);
407 status = do_vfs_lock(filp, fl);
412 * Make sure we clear the cache whenever we try to get the lock.
413 * This makes locking act as a cache coherency point.
415 filemap_fdatawrite(filp->f_mapping);
417 nfs_wb_all(inode); /* we may have slept */
419 filemap_fdatawait(filp->f_mapping);
420 nfs_zap_caches(inode);
422 rpc_clnt_sigunmask(NFS_CLIENT(inode), &oldset);
427 * Lock a (portion of) a file
429 static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
431 struct inode * inode = filp->f_mapping->host;
433 dprintk("NFS: nfs_lock(f=%s/%ld, t=%x, fl=%x, r=%Ld:%Ld)\n",
434 inode->i_sb->s_id, inode->i_ino,
435 fl->fl_type, fl->fl_flags,
436 (long long)fl->fl_start, (long long)fl->fl_end);
441 /* No mandatory locks over NFS */
442 if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
446 return do_getlk(filp, cmd, fl);
447 if (fl->fl_type == F_UNLCK)
448 return do_unlk(filp, cmd, fl);
449 return do_setlk(filp, cmd, fl);
453 * Lock a (portion of) a file
455 static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
457 struct inode * inode = filp->f_mapping->host;
459 dprintk("NFS: nfs_flock(f=%s/%ld, t=%x, fl=%x)\n",
460 inode->i_sb->s_id, inode->i_ino,
461 fl->fl_type, fl->fl_flags);
467 * No BSD flocks over NFS allowed.
468 * Note: we could try to fake a POSIX lock request here by
469 * using ((u32) filp | 0x80000000) or some such as the pid.
470 * Not sure whether that would be unique, though, or whether
471 * that would break in other places.
473 if (!(fl->fl_flags & FL_FLOCK))
476 /* We're simulating flock() locks using posix locks on the server */
477 fl->fl_owner = (fl_owner_t)filp;
479 fl->fl_end = OFFSET_MAX;
481 if (fl->fl_type == F_UNLCK)
482 return do_unlk(filp, cmd, fl);
483 return do_setlk(filp, cmd, fl);