2005-04-16 18:20:36 -04:00
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/*
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* linux/fs/nfs/file.c
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*
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* Copyright (C) 1992 Rick Sladkey
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*
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* Changes Copyright (C) 1994 by Florian La Roche
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* - Do not copy data too often around in the kernel.
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* - In nfs_file_read the return value of kmalloc wasn't checked.
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* - Put in a better version of read look-ahead buffering. Original idea
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* and implementation by Wai S Kok elekokws@ee.nus.sg.
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*
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* Expire cache on write to a file by Wai S Kok (Oct 1994).
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*
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* Total rewrite of read side for new NFS buffer cache.. Linus.
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*
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* nfs regular file handling functions
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*/
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#include <linux/time.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/fcntl.h>
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#include <linux/stat.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_mount.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include <linux/smp_lock.h>
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Detach sched.h from mm.h
First thing mm.h does is including sched.h solely for can_do_mlock() inline
function which has "current" dereference inside. By dealing with can_do_mlock()
mm.h can be detached from sched.h which is good. See below, why.
This patch
a) removes unconditional inclusion of sched.h from mm.h
b) makes can_do_mlock() normal function in mm/mlock.c
c) exports can_do_mlock() to not break compilation
d) adds sched.h inclusions back to files that were getting it indirectly.
e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
getting them indirectly
Net result is:
a) mm.h users would get less code to open, read, preprocess, parse, ... if
they don't need sched.h
b) sched.h stops being dependency for significant number of files:
on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
after patch it's only 3744 (-8.3%).
Cross-compile tested on
all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
alpha alpha-up
arm
i386 i386-up i386-defconfig i386-allnoconfig
ia64 ia64-up
m68k
mips
parisc parisc-up
powerpc powerpc-up
s390 s390-up
sparc sparc-up
sparc64 sparc64-up
um-x86_64
x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig
as well as my two usual configs.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-20 17:22:52 -04:00
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#include <linux/aio.h>
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2005-04-16 18:20:36 -04:00
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include "delegation.h"
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2007-07-22 17:09:05 -04:00
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#include "internal.h"
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2006-03-20 13:44:14 -05:00
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#include "iostat.h"
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2005-04-16 18:20:36 -04:00
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#define NFSDBG_FACILITY NFSDBG_FILE
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static int nfs_file_open(struct inode *, struct file *);
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static int nfs_file_release(struct inode *, struct file *);
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2005-06-13 11:14:01 -04:00
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static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin);
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2005-04-16 18:20:36 -04:00
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static int nfs_file_mmap(struct file *, struct vm_area_struct *);
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2007-06-01 05:51:43 -04:00
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static ssize_t nfs_file_splice_read(struct file *filp, loff_t *ppos,
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struct pipe_inode_info *pipe,
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size_t count, unsigned int flags);
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2006-10-01 02:28:46 -04:00
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static ssize_t nfs_file_read(struct kiocb *, const struct iovec *iov,
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unsigned long nr_segs, loff_t pos);
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static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov,
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unsigned long nr_segs, loff_t pos);
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2006-06-23 05:05:12 -04:00
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static int nfs_file_flush(struct file *, fl_owner_t id);
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2008-05-27 16:29:07 -04:00
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static int nfs_file_fsync(struct file *, struct dentry *dentry, int datasync);
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2005-04-16 18:20:36 -04:00
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static int nfs_check_flags(int flags);
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static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl);
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static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl);
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2007-06-08 15:23:34 -04:00
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static int nfs_setlease(struct file *file, long arg, struct file_lock **fl);
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2005-04-16 18:20:36 -04:00
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2007-07-22 17:09:05 -04:00
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static struct vm_operations_struct nfs_file_vm_ops;
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2006-03-28 04:56:42 -05:00
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const struct file_operations nfs_file_operations = {
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2005-06-13 11:14:01 -04:00
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.llseek = nfs_file_llseek,
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2005-04-16 18:20:36 -04:00
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.read = do_sync_read,
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.write = do_sync_write,
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2006-10-01 02:28:46 -04:00
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.aio_read = nfs_file_read,
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.aio_write = nfs_file_write,
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2008-04-01 23:23:39 -04:00
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#ifdef CONFIG_MMU
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2005-04-16 18:20:36 -04:00
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.mmap = nfs_file_mmap,
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2008-04-01 23:23:39 -04:00
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#else
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.mmap = generic_file_mmap,
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#endif
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2005-04-16 18:20:36 -04:00
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.open = nfs_file_open,
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.flush = nfs_file_flush,
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.release = nfs_file_release,
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2008-05-27 16:29:07 -04:00
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.fsync = nfs_file_fsync,
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2005-04-16 18:20:36 -04:00
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.lock = nfs_lock,
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.flock = nfs_flock,
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2007-06-01 05:51:43 -04:00
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.splice_read = nfs_file_splice_read,
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2005-04-16 18:20:36 -04:00
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.check_flags = nfs_check_flags,
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2007-06-08 15:23:34 -04:00
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.setlease = nfs_setlease,
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2005-04-16 18:20:36 -04:00
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};
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2007-02-12 03:55:39 -05:00
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const struct inode_operations nfs_file_inode_operations = {
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2005-04-16 18:20:36 -04:00
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.permission = nfs_permission,
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.getattr = nfs_getattr,
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.setattr = nfs_setattr,
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};
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2005-06-22 13:16:27 -04:00
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#ifdef CONFIG_NFS_V3
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2007-02-12 03:55:39 -05:00
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const struct inode_operations nfs3_file_inode_operations = {
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2005-06-22 13:16:27 -04:00
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.permission = nfs_permission,
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.getattr = nfs_getattr,
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.setattr = nfs_setattr,
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.listxattr = nfs3_listxattr,
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.getxattr = nfs3_getxattr,
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.setxattr = nfs3_setxattr,
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.removexattr = nfs3_removexattr,
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};
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#endif /* CONFIG_NFS_v3 */
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2005-04-16 18:20:36 -04:00
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/* Hack for future NFS swap support */
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#ifndef IS_SWAPFILE
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# define IS_SWAPFILE(inode) (0)
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#endif
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static int nfs_check_flags(int flags)
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{
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if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT))
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return -EINVAL;
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return 0;
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}
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/*
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* Open file
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*/
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static int
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nfs_file_open(struct inode *inode, struct file *filp)
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{
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int res;
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2008-06-11 17:55:58 -04:00
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dprintk("NFS: open file(%s/%s)\n",
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2008-06-11 17:55:42 -04:00
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filp->f_path.dentry->d_parent->d_name.name,
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filp->f_path.dentry->d_name.name);
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2005-04-16 18:20:36 -04:00
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res = nfs_check_flags(filp->f_flags);
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if (res)
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return res;
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2006-03-20 13:44:14 -05:00
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nfs_inc_stats(inode, NFSIOS_VFSOPEN);
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2008-06-11 16:32:46 -04:00
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res = nfs_open(inode, filp);
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2005-04-16 18:20:36 -04:00
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return res;
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}
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static int
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nfs_file_release(struct inode *inode, struct file *filp)
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{
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2008-06-11 17:55:58 -04:00
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struct dentry *dentry = filp->f_path.dentry;
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dprintk("NFS: release(%s/%s)\n",
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dentry->d_parent->d_name.name,
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dentry->d_name.name);
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2005-04-16 18:20:36 -04:00
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/* Ensure that dirty pages are flushed out with the right creds */
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if (filp->f_mode & FMODE_WRITE)
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2008-06-11 17:55:58 -04:00
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nfs_wb_all(dentry->d_inode);
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2006-03-20 13:44:14 -05:00
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nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
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2008-06-11 16:32:46 -04:00
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return nfs_release(inode, filp);
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2005-04-16 18:20:36 -04:00
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}
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2005-06-13 11:14:01 -04:00
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/**
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* nfs_revalidate_size - Revalidate the file size
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* @inode - pointer to inode struct
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* @file - pointer to struct file
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*
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* Revalidates the file length. This is basically a wrapper around
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* nfs_revalidate_inode() that takes into account the fact that we may
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* have cached writes (in which case we don't care about the server's
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* idea of what the file length is), or O_DIRECT (in which case we
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* shouldn't trust the cache).
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*/
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static int nfs_revalidate_file_size(struct inode *inode, struct file *filp)
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{
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struct nfs_server *server = NFS_SERVER(inode);
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struct nfs_inode *nfsi = NFS_I(inode);
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if (server->flags & NFS_MOUNT_NOAC)
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goto force_reval;
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if (filp->f_flags & O_DIRECT)
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goto force_reval;
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if (nfsi->npages != 0)
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return 0;
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2005-08-18 14:24:09 -04:00
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if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode))
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2005-06-22 13:16:30 -04:00
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return 0;
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2005-06-13 11:14:01 -04:00
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force_reval:
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return __nfs_revalidate_inode(server, inode);
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}
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static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin)
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{
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2008-06-27 05:05:24 -04:00
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loff_t loff;
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2008-07-15 18:34:16 -04:00
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2008-06-11 17:55:58 -04:00
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dprintk("NFS: llseek file(%s/%s, %lld, %d)\n",
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2008-06-11 17:55:34 -04:00
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filp->f_path.dentry->d_parent->d_name.name,
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filp->f_path.dentry->d_name.name,
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offset, origin);
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2005-06-13 11:14:01 -04:00
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/* origin == SEEK_END => we must revalidate the cached file length */
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2006-09-16 21:09:32 -04:00
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if (origin == SEEK_END) {
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2005-06-13 11:14:01 -04:00
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struct inode *inode = filp->f_mapping->host;
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2008-09-23 17:28:35 -04:00
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2005-06-13 11:14:01 -04:00
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int retval = nfs_revalidate_file_size(inode, filp);
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if (retval < 0)
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return (loff_t)retval;
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2008-09-23 17:28:35 -04:00
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spin_lock(&inode->i_lock);
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loff = generic_file_llseek_unlocked(filp, offset, origin);
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spin_unlock(&inode->i_lock);
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} else
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loff = generic_file_llseek_unlocked(filp, offset, origin);
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2008-06-27 05:05:24 -04:00
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return loff;
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2005-06-13 11:14:01 -04:00
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}
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2007-07-25 14:09:54 -04:00
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/*
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2008-05-27 16:29:07 -04:00
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* Helper for nfs_file_flush() and nfs_file_fsync()
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2007-07-25 14:09:54 -04:00
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*
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* Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to
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* disk, but it retrieves and clears ctx->error after synching, despite
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* the two being set at the same time in nfs_context_set_write_error().
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* This is because the former is used to notify the _next_ call to
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* nfs_file_write() that a write error occured, and hence cause it to
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* fall back to doing a synchronous write.
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*/
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static int nfs_do_fsync(struct nfs_open_context *ctx, struct inode *inode)
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{
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int have_error, status;
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int ret = 0;
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have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
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status = nfs_wb_all(inode);
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have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
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if (have_error)
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ret = xchg(&ctx->error, 0);
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if (!ret)
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ret = status;
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return ret;
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}
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2005-04-16 18:20:36 -04:00
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/*
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* Flush all dirty pages, and check for write errors.
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*/
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static int
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2006-06-23 05:05:12 -04:00
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nfs_file_flush(struct file *file, fl_owner_t id)
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2005-04-16 18:20:36 -04:00
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{
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2007-08-10 17:44:32 -04:00
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struct nfs_open_context *ctx = nfs_file_open_context(file);
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2008-06-11 17:55:58 -04:00
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struct dentry *dentry = file->f_path.dentry;
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struct inode *inode = dentry->d_inode;
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2005-04-16 18:20:36 -04:00
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int status;
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2008-06-11 17:55:58 -04:00
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dprintk("NFS: flush(%s/%s)\n",
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dentry->d_parent->d_name.name,
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dentry->d_name.name);
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2005-04-16 18:20:36 -04:00
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if ((file->f_mode & FMODE_WRITE) == 0)
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return 0;
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2006-03-20 13:44:14 -05:00
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nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
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2007-07-25 14:09:54 -04:00
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2005-04-16 18:20:36 -04:00
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/* Ensure that data+attribute caches are up to date after close() */
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2007-07-25 14:09:54 -04:00
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status = nfs_do_fsync(ctx, inode);
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if (!status)
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nfs_revalidate_inode(NFS_SERVER(inode), inode);
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2005-04-16 18:20:36 -04:00
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return status;
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}
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static ssize_t
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2006-10-01 02:28:46 -04:00
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nfs_file_read(struct kiocb *iocb, const struct iovec *iov,
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unsigned long nr_segs, loff_t pos)
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2005-04-16 18:20:36 -04:00
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{
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2006-12-08 05:36:40 -05:00
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struct dentry * dentry = iocb->ki_filp->f_path.dentry;
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2005-04-16 18:20:36 -04:00
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struct inode * inode = dentry->d_inode;
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ssize_t result;
|
2006-10-01 02:28:46 -04:00
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size_t count = iov_length(iov, nr_segs);
|
2005-04-16 18:20:36 -04:00
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if (iocb->ki_filp->f_flags & O_DIRECT)
|
2006-10-01 02:28:46 -04:00
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return nfs_file_direct_read(iocb, iov, nr_segs, pos);
|
2005-04-16 18:20:36 -04:00
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2008-06-11 17:55:58 -04:00
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dprintk("NFS: read(%s/%s, %lu@%lu)\n",
|
2005-04-16 18:20:36 -04:00
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|
dentry->d_parent->d_name.name, dentry->d_name.name,
|
|
|
|
(unsigned long) count, (unsigned long) pos);
|
|
|
|
|
2006-05-25 01:40:59 -04:00
|
|
|
result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
|
2006-03-20 13:44:14 -05:00
|
|
|
nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count);
|
2005-04-16 18:20:36 -04:00
|
|
|
if (!result)
|
2006-10-01 02:28:46 -04:00
|
|
|
result = generic_file_aio_read(iocb, iov, nr_segs, pos);
|
2005-04-16 18:20:36 -04:00
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t
|
2007-06-01 05:51:43 -04:00
|
|
|
nfs_file_splice_read(struct file *filp, loff_t *ppos,
|
|
|
|
struct pipe_inode_info *pipe, size_t count,
|
|
|
|
unsigned int flags)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2006-12-08 05:36:40 -05:00
|
|
|
struct dentry *dentry = filp->f_path.dentry;
|
2005-04-16 18:20:36 -04:00
|
|
|
struct inode *inode = dentry->d_inode;
|
|
|
|
ssize_t res;
|
|
|
|
|
2008-06-11 17:55:58 -04:00
|
|
|
dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n",
|
2005-04-16 18:20:36 -04:00
|
|
|
dentry->d_parent->d_name.name, dentry->d_name.name,
|
|
|
|
(unsigned long) count, (unsigned long long) *ppos);
|
|
|
|
|
2006-05-25 01:40:59 -04:00
|
|
|
res = nfs_revalidate_mapping(inode, filp->f_mapping);
|
2005-04-16 18:20:36 -04:00
|
|
|
if (!res)
|
2007-06-01 05:51:43 -04:00
|
|
|
res = generic_file_splice_read(filp, ppos, pipe, count, flags);
|
2005-04-16 18:20:36 -04:00
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
|
|
|
|
{
|
2006-12-08 05:36:40 -05:00
|
|
|
struct dentry *dentry = file->f_path.dentry;
|
2005-04-16 18:20:36 -04:00
|
|
|
struct inode *inode = dentry->d_inode;
|
|
|
|
int status;
|
|
|
|
|
2008-06-11 17:55:58 -04:00
|
|
|
dprintk("NFS: mmap(%s/%s)\n",
|
2005-04-16 18:20:36 -04:00
|
|
|
dentry->d_parent->d_name.name, dentry->d_name.name);
|
|
|
|
|
2006-05-25 01:40:59 -04:00
|
|
|
status = nfs_revalidate_mapping(inode, file->f_mapping);
|
2007-07-22 17:09:05 -04:00
|
|
|
if (!status) {
|
|
|
|
vma->vm_ops = &nfs_file_vm_ops;
|
|
|
|
vma->vm_flags |= VM_CAN_NONLINEAR;
|
|
|
|
file_accessed(file);
|
|
|
|
}
|
2005-04-16 18:20:36 -04:00
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Flush any dirty pages for this process, and check for write errors.
|
|
|
|
* The return status from this call provides a reliable indication of
|
|
|
|
* whether any write errors occurred for this process.
|
|
|
|
*/
|
|
|
|
static int
|
2008-05-27 16:29:07 -04:00
|
|
|
nfs_file_fsync(struct file *file, struct dentry *dentry, int datasync)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2007-08-10 17:44:32 -04:00
|
|
|
struct nfs_open_context *ctx = nfs_file_open_context(file);
|
2005-04-16 18:20:36 -04:00
|
|
|
struct inode *inode = dentry->d_inode;
|
|
|
|
|
2008-06-11 17:55:58 -04:00
|
|
|
dprintk("NFS: fsync file(%s/%s) datasync %d\n",
|
2008-05-27 16:29:07 -04:00
|
|
|
dentry->d_parent->d_name.name, dentry->d_name.name,
|
|
|
|
datasync);
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2006-03-20 13:44:14 -05:00
|
|
|
nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
|
2007-07-25 14:09:54 -04:00
|
|
|
return nfs_do_fsync(ctx, inode);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
2007-10-16 04:25:16 -04:00
|
|
|
* This does the "real" work of the write. We must allocate and lock the
|
|
|
|
* page to be sent back to the generic routine, which then copies the
|
|
|
|
* data from user space.
|
2005-04-16 18:20:36 -04:00
|
|
|
*
|
|
|
|
* If the writer ends up delaying the write, the writer needs to
|
|
|
|
* increment the page use counts until he is done with the page.
|
|
|
|
*/
|
2007-10-16 04:25:16 -04:00
|
|
|
static int nfs_write_begin(struct file *file, struct address_space *mapping,
|
|
|
|
loff_t pos, unsigned len, unsigned flags,
|
|
|
|
struct page **pagep, void **fsdata)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2007-10-16 04:25:16 -04:00
|
|
|
int ret;
|
|
|
|
pgoff_t index;
|
|
|
|
struct page *page;
|
|
|
|
index = pos >> PAGE_CACHE_SHIFT;
|
|
|
|
|
2008-06-11 17:55:50 -04:00
|
|
|
dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n",
|
|
|
|
file->f_path.dentry->d_parent->d_name.name,
|
|
|
|
file->f_path.dentry->d_name.name,
|
|
|
|
mapping->host->i_ino, len, (long long) pos);
|
|
|
|
|
fs: symlink write_begin allocation context fix
With the write_begin/write_end aops, page_symlink was broken because it
could no longer pass a GFP_NOFS type mask into the point where the
allocations happened. They are done in write_begin, which would always
assume that the filesystem can be entered from reclaim. This bug could
cause filesystem deadlocks.
The funny thing with having a gfp_t mask there is that it doesn't really
allow the caller to arbitrarily tinker with the context in which it can be
called. It couldn't ever be GFP_ATOMIC, for example, because it needs to
take the page lock. The only thing any callers care about is __GFP_FS
anyway, so turn that into a single flag.
Add a new flag for write_begin, AOP_FLAG_NOFS. Filesystems can now act on
this flag in their write_begin function. Change __grab_cache_page to
accept a nofs argument as well, to honour that flag (while we're there,
change the name to grab_cache_page_write_begin which is more instructive
and does away with random leading underscores).
This is really a more flexible way to go in the end anyway -- if a
filesystem happens to want any extra allocations aside from the pagecache
ones in ints write_begin function, it may now use GFP_KERNEL (rather than
GFP_NOFS) for common case allocations (eg. ocfs2_alloc_write_ctxt, for a
random example).
[kosaki.motohiro@jp.fujitsu.com: fix ubifs]
[kosaki.motohiro@jp.fujitsu.com: fix fuse]
Signed-off-by: Nick Piggin <npiggin@suse.de>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: <stable@kernel.org> [2.6.28.x]
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
[ Cleaned up the calling convention: just pass in the AOP flags
untouched to the grab_cache_page_write_begin() function. That
just simplifies everybody, and may even allow future expansion of the
logic. - Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-01-04 15:00:53 -05:00
|
|
|
page = grab_cache_page_write_begin(mapping, index, flags);
|
2007-10-16 04:25:16 -04:00
|
|
|
if (!page)
|
|
|
|
return -ENOMEM;
|
|
|
|
*pagep = page;
|
|
|
|
|
|
|
|
ret = nfs_flush_incompatible(file, page);
|
|
|
|
if (ret) {
|
|
|
|
unlock_page(page);
|
|
|
|
page_cache_release(page);
|
|
|
|
}
|
|
|
|
return ret;
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
2007-10-16 04:25:16 -04:00
|
|
|
static int nfs_write_end(struct file *file, struct address_space *mapping,
|
|
|
|
loff_t pos, unsigned len, unsigned copied,
|
|
|
|
struct page *page, void *fsdata)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2007-10-16 04:25:16 -04:00
|
|
|
unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
|
|
|
|
int status;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2008-06-11 17:55:50 -04:00
|
|
|
dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n",
|
|
|
|
file->f_path.dentry->d_parent->d_name.name,
|
|
|
|
file->f_path.dentry->d_name.name,
|
|
|
|
mapping->host->i_ino, len, (long long) pos);
|
|
|
|
|
2008-06-10 18:31:00 -04:00
|
|
|
/*
|
|
|
|
* Zero any uninitialised parts of the page, and then mark the page
|
|
|
|
* as up to date if it turns out that we're extending the file.
|
|
|
|
*/
|
|
|
|
if (!PageUptodate(page)) {
|
|
|
|
unsigned pglen = nfs_page_length(page);
|
|
|
|
unsigned end = offset + len;
|
|
|
|
|
|
|
|
if (pglen == 0) {
|
|
|
|
zero_user_segments(page, 0, offset,
|
|
|
|
end, PAGE_CACHE_SIZE);
|
|
|
|
SetPageUptodate(page);
|
|
|
|
} else if (end >= pglen) {
|
|
|
|
zero_user_segment(page, end, PAGE_CACHE_SIZE);
|
|
|
|
if (offset == 0)
|
|
|
|
SetPageUptodate(page);
|
|
|
|
} else
|
|
|
|
zero_user_segment(page, pglen, PAGE_CACHE_SIZE);
|
|
|
|
}
|
|
|
|
|
2007-10-16 04:25:16 -04:00
|
|
|
status = nfs_updatepage(file, page, offset, copied);
|
|
|
|
|
|
|
|
unlock_page(page);
|
|
|
|
page_cache_release(page);
|
|
|
|
|
2007-12-20 14:55:04 -05:00
|
|
|
if (status < 0)
|
|
|
|
return status;
|
|
|
|
return copied;
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
2006-03-26 04:37:18 -05:00
|
|
|
static void nfs_invalidate_page(struct page *page, unsigned long offset)
|
2006-03-20 13:44:04 -05:00
|
|
|
{
|
2008-06-11 17:55:50 -04:00
|
|
|
dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset);
|
|
|
|
|
2006-10-09 16:18:38 -04:00
|
|
|
if (offset != 0)
|
|
|
|
return;
|
2006-05-31 01:13:38 -04:00
|
|
|
/* Cancel any unstarted writes on this page */
|
2007-08-28 10:29:36 -04:00
|
|
|
nfs_wb_page_cancel(page->mapping->host, page);
|
2006-03-20 13:44:04 -05:00
|
|
|
}
|
|
|
|
|
|
|
|
static int nfs_release_page(struct page *page, gfp_t gfp)
|
|
|
|
{
|
2008-06-11 17:55:50 -04:00
|
|
|
dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
|
|
|
|
|
2007-01-11 02:15:39 -05:00
|
|
|
/* If PagePrivate() is set, then the page is not freeable */
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int nfs_launder_page(struct page *page)
|
|
|
|
{
|
2008-06-11 17:55:50 -04:00
|
|
|
struct inode *inode = page->mapping->host;
|
|
|
|
|
|
|
|
dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n",
|
|
|
|
inode->i_ino, (long long)page_offset(page));
|
|
|
|
|
|
|
|
return nfs_wb_page(inode, page);
|
2006-03-20 13:44:04 -05:00
|
|
|
}
|
|
|
|
|
2006-06-28 07:26:44 -04:00
|
|
|
const struct address_space_operations nfs_file_aops = {
|
2005-04-16 18:20:36 -04:00
|
|
|
.readpage = nfs_readpage,
|
|
|
|
.readpages = nfs_readpages,
|
2007-07-22 17:09:05 -04:00
|
|
|
.set_page_dirty = __set_page_dirty_nobuffers,
|
2005-04-16 18:20:36 -04:00
|
|
|
.writepage = nfs_writepage,
|
|
|
|
.writepages = nfs_writepages,
|
2007-10-16 04:25:16 -04:00
|
|
|
.write_begin = nfs_write_begin,
|
|
|
|
.write_end = nfs_write_end,
|
2006-03-20 13:44:04 -05:00
|
|
|
.invalidatepage = nfs_invalidate_page,
|
|
|
|
.releasepage = nfs_release_page,
|
2005-04-16 18:20:36 -04:00
|
|
|
.direct_IO = nfs_direct_IO,
|
2007-01-11 02:15:39 -05:00
|
|
|
.launder_page = nfs_launder_page,
|
2005-04-16 18:20:36 -04:00
|
|
|
};
|
|
|
|
|
2007-07-22 17:09:05 -04:00
|
|
|
static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct page *page)
|
|
|
|
{
|
|
|
|
struct file *filp = vma->vm_file;
|
2008-06-11 17:55:50 -04:00
|
|
|
struct dentry *dentry = filp->f_path.dentry;
|
2007-07-22 17:09:05 -04:00
|
|
|
unsigned pagelen;
|
|
|
|
int ret = -EINVAL;
|
2007-10-16 04:25:16 -04:00
|
|
|
struct address_space *mapping;
|
2007-07-22 17:09:05 -04:00
|
|
|
|
2008-06-11 17:55:50 -04:00
|
|
|
dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n",
|
|
|
|
dentry->d_parent->d_name.name, dentry->d_name.name,
|
|
|
|
filp->f_mapping->host->i_ino,
|
|
|
|
(long long)page_offset(page));
|
|
|
|
|
2007-07-22 17:09:05 -04:00
|
|
|
lock_page(page);
|
2007-10-16 04:25:16 -04:00
|
|
|
mapping = page->mapping;
|
2008-06-11 17:55:50 -04:00
|
|
|
if (mapping != dentry->d_inode->i_mapping)
|
2008-01-22 17:13:06 -05:00
|
|
|
goto out_unlock;
|
|
|
|
|
|
|
|
ret = 0;
|
2007-07-22 17:09:05 -04:00
|
|
|
pagelen = nfs_page_length(page);
|
2008-01-22 17:13:06 -05:00
|
|
|
if (pagelen == 0)
|
|
|
|
goto out_unlock;
|
2007-10-16 04:25:16 -04:00
|
|
|
|
2008-01-22 17:13:06 -05:00
|
|
|
ret = nfs_flush_incompatible(filp, page);
|
|
|
|
if (ret != 0)
|
|
|
|
goto out_unlock;
|
|
|
|
|
|
|
|
ret = nfs_updatepage(filp, page, 0, pagelen);
|
|
|
|
if (ret == 0)
|
|
|
|
ret = pagelen;
|
|
|
|
out_unlock:
|
|
|
|
unlock_page(page);
|
2007-07-22 17:09:05 -04:00
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct vm_operations_struct nfs_file_vm_ops = {
|
|
|
|
.fault = filemap_fault,
|
|
|
|
.page_mkwrite = nfs_vm_page_mkwrite,
|
|
|
|
};
|
|
|
|
|
2007-07-25 14:09:54 -04:00
|
|
|
static int nfs_need_sync_write(struct file *filp, struct inode *inode)
|
|
|
|
{
|
|
|
|
struct nfs_open_context *ctx;
|
|
|
|
|
|
|
|
if (IS_SYNC(inode) || (filp->f_flags & O_SYNC))
|
|
|
|
return 1;
|
2007-08-10 17:44:32 -04:00
|
|
|
ctx = nfs_file_open_context(filp);
|
2007-07-25 14:09:54 -04:00
|
|
|
if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags))
|
|
|
|
return 1;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2006-10-01 02:28:46 -04:00
|
|
|
static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
|
|
|
|
unsigned long nr_segs, loff_t pos)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2006-12-08 05:36:40 -05:00
|
|
|
struct dentry * dentry = iocb->ki_filp->f_path.dentry;
|
2005-04-16 18:20:36 -04:00
|
|
|
struct inode * inode = dentry->d_inode;
|
|
|
|
ssize_t result;
|
2006-10-01 02:28:46 -04:00
|
|
|
size_t count = iov_length(iov, nr_segs);
|
2005-04-16 18:20:36 -04:00
|
|
|
|
|
|
|
if (iocb->ki_filp->f_flags & O_DIRECT)
|
2006-10-01 02:28:46 -04:00
|
|
|
return nfs_file_direct_write(iocb, iov, nr_segs, pos);
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2008-06-11 17:55:58 -04:00
|
|
|
dprintk("NFS: write(%s/%s, %lu@%Ld)\n",
|
2005-04-16 18:20:36 -04:00
|
|
|
dentry->d_parent->d_name.name, dentry->d_name.name,
|
2008-06-11 17:55:58 -04:00
|
|
|
(unsigned long) count, (long long) pos);
|
2005-04-16 18:20:36 -04:00
|
|
|
|
|
|
|
result = -EBUSY;
|
|
|
|
if (IS_SWAPFILE(inode))
|
|
|
|
goto out_swapfile;
|
2005-06-22 13:16:30 -04:00
|
|
|
/*
|
|
|
|
* O_APPEND implies that we must revalidate the file length.
|
|
|
|
*/
|
|
|
|
if (iocb->ki_filp->f_flags & O_APPEND) {
|
|
|
|
result = nfs_revalidate_file_size(inode, iocb->ki_filp);
|
|
|
|
if (result)
|
|
|
|
goto out;
|
2005-06-22 13:16:30 -04:00
|
|
|
}
|
2005-04-16 18:20:36 -04:00
|
|
|
|
|
|
|
result = count;
|
|
|
|
if (!count)
|
|
|
|
goto out;
|
|
|
|
|
2006-03-20 13:44:14 -05:00
|
|
|
nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count);
|
2006-10-01 02:28:46 -04:00
|
|
|
result = generic_file_aio_write(iocb, iov, nr_segs, pos);
|
2006-12-05 00:35:40 -05:00
|
|
|
/* Return error values for O_SYNC and IS_SYNC() */
|
2007-07-25 14:09:54 -04:00
|
|
|
if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) {
|
2007-08-10 17:44:32 -04:00
|
|
|
int err = nfs_do_fsync(nfs_file_open_context(iocb->ki_filp), inode);
|
2006-12-05 00:35:40 -05:00
|
|
|
if (err < 0)
|
|
|
|
result = err;
|
|
|
|
}
|
2005-04-16 18:20:36 -04:00
|
|
|
out:
|
|
|
|
return result;
|
|
|
|
|
|
|
|
out_swapfile:
|
|
|
|
printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int do_getlk(struct file *filp, int cmd, struct file_lock *fl)
|
|
|
|
{
|
|
|
|
struct inode *inode = filp->f_mapping->host;
|
|
|
|
int status = 0;
|
|
|
|
|
|
|
|
lock_kernel();
|
2005-10-18 17:20:16 -04:00
|
|
|
/* Try local locking first */
|
2007-05-11 16:09:32 -04:00
|
|
|
posix_test_lock(filp, fl);
|
|
|
|
if (fl->fl_type != F_UNLCK) {
|
|
|
|
/* found a conflict */
|
2005-10-18 17:20:16 -04:00
|
|
|
goto out;
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
2005-10-18 17:20:16 -04:00
|
|
|
|
|
|
|
if (nfs_have_delegation(inode, FMODE_READ))
|
|
|
|
goto out_noconflict;
|
|
|
|
|
|
|
|
if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)
|
|
|
|
goto out_noconflict;
|
|
|
|
|
|
|
|
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
|
|
|
|
out:
|
2005-04-16 18:20:36 -04:00
|
|
|
unlock_kernel();
|
|
|
|
return status;
|
2005-10-18 17:20:16 -04:00
|
|
|
out_noconflict:
|
|
|
|
fl->fl_type = F_UNLCK;
|
|
|
|
goto out;
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
static int do_vfs_lock(struct file *file, struct file_lock *fl)
|
|
|
|
{
|
|
|
|
int res = 0;
|
|
|
|
switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
|
|
|
|
case FL_POSIX:
|
|
|
|
res = posix_lock_file_wait(file, fl);
|
|
|
|
break;
|
|
|
|
case FL_FLOCK:
|
|
|
|
res = flock_lock_file_wait(file, fl);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
BUG();
|
|
|
|
}
|
|
|
|
if (res < 0)
|
2007-01-30 17:36:01 -05:00
|
|
|
dprintk(KERN_WARNING "%s: VFS is out of sync with lock manager"
|
|
|
|
" - error %d!\n",
|
2008-05-02 16:42:44 -04:00
|
|
|
__func__, res);
|
2005-04-16 18:20:36 -04:00
|
|
|
return res;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int do_unlk(struct file *filp, int cmd, struct file_lock *fl)
|
|
|
|
{
|
|
|
|
struct inode *inode = filp->f_mapping->host;
|
|
|
|
int status;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Flush all pending writes before doing anything
|
|
|
|
* with locks..
|
|
|
|
*/
|
2005-12-13 16:13:54 -05:00
|
|
|
nfs_sync_mapping(filp->f_mapping);
|
2005-04-16 18:20:36 -04:00
|
|
|
|
|
|
|
/* NOTE: special case
|
|
|
|
* If we're signalled while cleaning up locks on process exit, we
|
|
|
|
* still need to complete the unlock.
|
|
|
|
*/
|
|
|
|
lock_kernel();
|
|
|
|
/* Use local locking if mounted with "-onolock" */
|
|
|
|
if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM))
|
|
|
|
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
|
|
|
|
else
|
|
|
|
status = do_vfs_lock(filp, fl);
|
|
|
|
unlock_kernel();
|
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int do_setlk(struct file *filp, int cmd, struct file_lock *fl)
|
|
|
|
{
|
|
|
|
struct inode *inode = filp->f_mapping->host;
|
|
|
|
int status;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Flush all pending writes before doing anything
|
|
|
|
* with locks..
|
|
|
|
*/
|
2005-12-13 16:13:54 -05:00
|
|
|
status = nfs_sync_mapping(filp->f_mapping);
|
|
|
|
if (status != 0)
|
2005-04-16 18:20:36 -04:00
|
|
|
goto out;
|
|
|
|
|
|
|
|
lock_kernel();
|
|
|
|
/* Use local locking if mounted with "-onolock" */
|
2008-04-01 20:26:52 -04:00
|
|
|
if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM))
|
2005-04-16 18:20:36 -04:00
|
|
|
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
|
2008-04-01 20:26:52 -04:00
|
|
|
else
|
2005-04-16 18:20:36 -04:00
|
|
|
status = do_vfs_lock(filp, fl);
|
|
|
|
unlock_kernel();
|
|
|
|
if (status < 0)
|
|
|
|
goto out;
|
|
|
|
/*
|
|
|
|
* Make sure we clear the cache whenever we try to get the lock.
|
|
|
|
* This makes locking act as a cache coherency point.
|
|
|
|
*/
|
2005-12-13 16:13:54 -05:00
|
|
|
nfs_sync_mapping(filp->f_mapping);
|
2008-06-10 18:31:02 -04:00
|
|
|
if (!nfs_have_delegation(inode, FMODE_READ))
|
|
|
|
nfs_zap_caches(inode);
|
2005-04-16 18:20:36 -04:00
|
|
|
out:
|
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Lock a (portion of) a file
|
|
|
|
*/
|
|
|
|
static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
|
|
|
|
{
|
2008-06-11 17:55:58 -04:00
|
|
|
struct inode *inode = filp->f_mapping->host;
|
2008-05-20 19:34:39 -04:00
|
|
|
int ret = -ENOLCK;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2008-06-11 17:55:58 -04:00
|
|
|
dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n",
|
|
|
|
filp->f_path.dentry->d_parent->d_name.name,
|
|
|
|
filp->f_path.dentry->d_name.name,
|
2005-04-16 18:20:36 -04:00
|
|
|
fl->fl_type, fl->fl_flags,
|
|
|
|
(long long)fl->fl_start, (long long)fl->fl_end);
|
2008-06-11 17:55:58 -04:00
|
|
|
|
2006-03-20 13:44:14 -05:00
|
|
|
nfs_inc_stats(inode, NFSIOS_VFSLOCK);
|
2005-04-16 18:20:36 -04:00
|
|
|
|
|
|
|
/* No mandatory locks over NFS */
|
2007-10-01 17:41:15 -04:00
|
|
|
if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
|
2008-05-20 19:34:39 -04:00
|
|
|
goto out_err;
|
|
|
|
|
|
|
|
if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
|
|
|
|
ret = NFS_PROTO(inode)->lock_check_bounds(fl);
|
|
|
|
if (ret < 0)
|
|
|
|
goto out_err;
|
|
|
|
}
|
2005-04-16 18:20:36 -04:00
|
|
|
|
|
|
|
if (IS_GETLK(cmd))
|
2008-05-20 19:34:39 -04:00
|
|
|
ret = do_getlk(filp, cmd, fl);
|
|
|
|
else if (fl->fl_type == F_UNLCK)
|
|
|
|
ret = do_unlk(filp, cmd, fl);
|
|
|
|
else
|
|
|
|
ret = do_setlk(filp, cmd, fl);
|
|
|
|
out_err:
|
|
|
|
return ret;
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Lock a (portion of) a file
|
|
|
|
*/
|
|
|
|
static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
|
|
|
|
{
|
2008-06-11 17:55:58 -04:00
|
|
|
dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n",
|
|
|
|
filp->f_path.dentry->d_parent->d_name.name,
|
|
|
|
filp->f_path.dentry->d_name.name,
|
2005-04-16 18:20:36 -04:00
|
|
|
fl->fl_type, fl->fl_flags);
|
|
|
|
|
|
|
|
if (!(fl->fl_flags & FL_FLOCK))
|
|
|
|
return -ENOLCK;
|
|
|
|
|
|
|
|
/* We're simulating flock() locks using posix locks on the server */
|
|
|
|
fl->fl_owner = (fl_owner_t)filp;
|
|
|
|
fl->fl_start = 0;
|
|
|
|
fl->fl_end = OFFSET_MAX;
|
|
|
|
|
|
|
|
if (fl->fl_type == F_UNLCK)
|
|
|
|
return do_unlk(filp, cmd, fl);
|
|
|
|
return do_setlk(filp, cmd, fl);
|
|
|
|
}
|
2007-06-08 15:23:34 -04:00
|
|
|
|
2008-06-11 17:55:58 -04:00
|
|
|
/*
|
|
|
|
* There is no protocol support for leases, so we have no way to implement
|
|
|
|
* them correctly in the face of opens by other clients.
|
|
|
|
*/
|
2007-06-08 15:23:34 -04:00
|
|
|
static int nfs_setlease(struct file *file, long arg, struct file_lock **fl)
|
|
|
|
{
|
2008-06-11 17:55:58 -04:00
|
|
|
dprintk("NFS: setlease(%s/%s, arg=%ld)\n",
|
|
|
|
file->f_path.dentry->d_parent->d_name.name,
|
|
|
|
file->f_path.dentry->d_name.name, arg);
|
|
|
|
|
2007-06-08 15:23:34 -04:00
|
|
|
return -EINVAL;
|
|
|
|
}
|