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![Linus Torvalds](/assets/img/avatar_default.png)
Highlights include: Stable fixes: - pNFS: Don't return layout segments that are being used for I/O - pNFS: Don't move layout segments off the active list when being used for I/O Features: - NFS: Add support for user xattrs through the NFSv4.2 protocol - NFS: Allow applications to speed up readdir+statx() using AT_STATX_DONT_SYNC - NFSv4.0 allow nconnect for v4.0 Bugfixes and cleanups: - nfs: ensure correct writeback errors are returned on close() - nfs: nfs_file_write() should check for writeback errors - nfs: Fix getxattr kernel panic and memory overflow - NFS: Fix the pNFS/flexfiles mirrored read failover code - SUNRPC: dont update timeout value on connection reset - freezer: Add unsafe versions of freezable_schedule_timeout_interruptible for NFS - sunrpc: destroy rpc_inode_cachep after unregister_filesystem -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEESQctxSBg8JpV8KqEZwvnipYKAPIFAl83CYEACgkQZwvnipYK APLx4g/9EQNTG5VkUToElRHs4b3vFxbmh9Odnk/JwPHxY5GQ8/AyGqwWHBgMZc7/ 2AV/C83pk7pJsDNsKbVAaFCT1cwjmItHM63vKJYGBYbE8LhkZ/1sYkdtPBYwHoVl 7CWfpVY/4NjYw5GJfrVA5Y0m7lrQInRtIMzfaENw2tpw+/cKUpadxgEJltzFNvpa Ploinr1ZRBl1tvfeHNRP5ZMPk2AfgGWtQKQ/b2UWUk5tXALoQm2Eu+/oku39uqhy hW5tCbU2BzR91gg5JwF9n7VowkCHXfe7lMzDBTVfwZOELOmoyys/1wKv550FWcWi yymljWiPGZOnXGT1vfKptPESQjdtElMfanvEZ0BzS+yNR0HZGnIupaxGlYlG9ZGU 2sXHQPp3mk2Q+L1IgbTSCnSju0YlZo32JQpYCZiROjIXnPWPQ50YNhr8GL18M1FW hTeShg2avWH+59GB6moEBmsuvui7Dy1jkimblToLEoGJ4kbvEl72FYSqTCkAXXbB rVUzhmJFgfk/EOS4d+QKJoBqNzw3aw79wyT7PLkoCYBqPZBHQexlmI+ktMbgUEdw c/fM7l5/Vcb9weIHKzul2Jbk5q6bFME/xPnIkr3v/oKIFlLFwQ04BX6R/42AMJHw V5Q9Wp81Vy6RXQMn8P0ZMeY0WQC/rhpijOEVMUC+Ni+spz44AdM= =k4pE -----END PGP SIGNATURE----- Merge tag 'nfs-for-5.9-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs Pull NFS client updates from Trond Myklebust: "Stable fixes: - pNFS: Don't return layout segments that are being used for I/O - pNFS: Don't move layout segments off the active list when being used for I/O Features: - NFS: Add support for user xattrs through the NFSv4.2 protocol - NFS: Allow applications to speed up readdir+statx() using AT_STATX_DONT_SYNC - NFSv4.0 allow nconnect for v4.0 Bugfixes and cleanups: - nfs: ensure correct writeback errors are returned on close() - nfs: nfs_file_write() should check for writeback errors - nfs: Fix getxattr kernel panic and memory overflow - NFS: Fix the pNFS/flexfiles mirrored read failover code - SUNRPC: dont update timeout value on connection reset - freezer: Add unsafe versions of freezable_schedule_timeout_interruptible for NFS - sunrpc: destroy rpc_inode_cachep after unregister_filesystem" * tag 'nfs-for-5.9-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (32 commits) NFS: Fix flexfiles read failover fs: nfs: delete repeated words in comments rpc_pipefs: convert comma to semicolon nfs: Fix getxattr kernel panic and memory overflow NFS: Don't return layout segments that are in use NFS: Don't move layouts to plh_return_segs list while in use NFS: Add layout segment info to pnfs read/write/commit tracepoints NFS: Add tracepoints for layouterror and layoutstats. NFS: Report the stateid + status in trace_nfs4_layoutreturn_on_close() SUNRPC dont update timeout value on connection reset nfs: nfs_file_write() should check for writeback errors nfs: ensure correct writeback errors are returned on close() NFSv4.2: xattr cache: get rid of cache discard work queue NFS: remove redundant initialization of variable result NFSv4.0 allow nconnect for v4.0 freezer: Add unsafe versions of freezable_schedule_timeout_interruptible for NFS sunrpc: destroy rpc_inode_cachep after unregister_filesystem NFSv4.2: add client side xattr caching. NFSv4.2: hook in the user extended attribute handlers NFSv4.2: add the extended attribute proc functions. ...
867 lines
22 KiB
C
867 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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/module.h>
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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/pagemap.h>
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#include <linux/gfp.h>
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#include <linux/swap.h>
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#include <linux/uaccess.h>
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#include "delegation.h"
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#include "internal.h"
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#include "iostat.h"
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#include "fscache.h"
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#include "pnfs.h"
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#include "nfstrace.h"
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#define NFSDBG_FACILITY NFSDBG_FILE
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static const struct vm_operations_struct nfs_file_vm_ops;
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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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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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EXPORT_SYMBOL_GPL(nfs_check_flags);
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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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dprintk("NFS: open file(%pD2)\n", filp);
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nfs_inc_stats(inode, NFSIOS_VFSOPEN);
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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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res = nfs_open(inode, filp);
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return res;
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}
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int
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nfs_file_release(struct inode *inode, struct file *filp)
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{
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dprintk("NFS: release(%pD2)\n", filp);
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nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
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nfs_file_clear_open_context(filp);
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return 0;
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}
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EXPORT_SYMBOL_GPL(nfs_file_release);
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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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* @filp: 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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if (filp->f_flags & O_DIRECT)
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goto force_reval;
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if (nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE))
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goto force_reval;
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return 0;
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force_reval:
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return __nfs_revalidate_inode(server, inode);
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}
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loff_t nfs_file_llseek(struct file *filp, loff_t offset, int whence)
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{
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dprintk("NFS: llseek file(%pD2, %lld, %d)\n",
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filp, offset, whence);
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/*
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* whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
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* the cached file length
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*/
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if (whence != SEEK_SET && whence != SEEK_CUR) {
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struct inode *inode = filp->f_mapping->host;
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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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}
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return generic_file_llseek(filp, offset, whence);
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}
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EXPORT_SYMBOL_GPL(nfs_file_llseek);
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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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nfs_file_flush(struct file *file, fl_owner_t id)
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{
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struct inode *inode = file_inode(file);
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errseq_t since;
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dprintk("NFS: flush(%pD2)\n", file);
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nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
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if ((file->f_mode & FMODE_WRITE) == 0)
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return 0;
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/* Flush writes to the server and return any errors */
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since = filemap_sample_wb_err(file->f_mapping);
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nfs_wb_all(inode);
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return filemap_check_wb_err(file->f_mapping, since);
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}
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ssize_t
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nfs_file_read(struct kiocb *iocb, struct iov_iter *to)
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{
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struct inode *inode = file_inode(iocb->ki_filp);
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ssize_t result;
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if (iocb->ki_flags & IOCB_DIRECT)
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return nfs_file_direct_read(iocb, to);
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dprintk("NFS: read(%pD2, %zu@%lu)\n",
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iocb->ki_filp,
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iov_iter_count(to), (unsigned long) iocb->ki_pos);
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nfs_start_io_read(inode);
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result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
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if (!result) {
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result = generic_file_read_iter(iocb, to);
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if (result > 0)
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nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
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}
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nfs_end_io_read(inode);
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return result;
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}
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EXPORT_SYMBOL_GPL(nfs_file_read);
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int
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nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
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{
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struct inode *inode = file_inode(file);
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int status;
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dprintk("NFS: mmap(%pD2)\n", file);
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/* Note: generic_file_mmap() returns ENOSYS on nommu systems
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* so we call that before revalidating the mapping
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*/
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status = generic_file_mmap(file, vma);
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if (!status) {
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vma->vm_ops = &nfs_file_vm_ops;
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status = nfs_revalidate_mapping(inode, file->f_mapping);
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}
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return status;
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}
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EXPORT_SYMBOL_GPL(nfs_file_mmap);
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/*
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* Flush any dirty pages for this process, and check for write errors.
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* The return status from this call provides a reliable indication of
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* whether any write errors occurred for this process.
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*/
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static int
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nfs_file_fsync_commit(struct file *file, int datasync)
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{
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struct inode *inode = file_inode(file);
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int ret;
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dprintk("NFS: fsync file(%pD2) datasync %d\n", file, datasync);
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nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
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ret = nfs_commit_inode(inode, FLUSH_SYNC);
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if (ret < 0)
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return ret;
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return file_check_and_advance_wb_err(file);
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}
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int
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nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
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{
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struct nfs_open_context *ctx = nfs_file_open_context(file);
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struct inode *inode = file_inode(file);
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int ret;
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trace_nfs_fsync_enter(inode);
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for (;;) {
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ret = file_write_and_wait_range(file, start, end);
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if (ret != 0)
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break;
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ret = nfs_file_fsync_commit(file, datasync);
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if (ret != 0)
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break;
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ret = pnfs_sync_inode(inode, !!datasync);
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if (ret != 0)
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break;
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if (!test_and_clear_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags))
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break;
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/*
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* If nfs_file_fsync_commit detected a server reboot, then
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* resend all dirty pages that might have been covered by
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* the NFS_CONTEXT_RESEND_WRITES flag
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*/
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start = 0;
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end = LLONG_MAX;
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}
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trace_nfs_fsync_exit(inode, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(nfs_file_fsync);
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/*
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* Decide whether a read/modify/write cycle may be more efficient
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* then a modify/write/read cycle when writing to a page in the
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* page cache.
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*
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* Some pNFS layout drivers can only read/write at a certain block
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* granularity like all block devices and therefore we must perform
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* read/modify/write whenever a page hasn't read yet and the data
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* to be written there is not aligned to a block boundary and/or
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* smaller than the block size.
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*
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* The modify/write/read cycle may occur if a page is read before
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* being completely filled by the writer. In this situation, the
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* page must be completely written to stable storage on the server
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* before it can be refilled by reading in the page from the server.
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* This can lead to expensive, small, FILE_SYNC mode writes being
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* done.
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*
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* It may be more efficient to read the page first if the file is
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* open for reading in addition to writing, the page is not marked
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* as Uptodate, it is not dirty or waiting to be committed,
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* indicating that it was previously allocated and then modified,
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* that there were valid bytes of data in that range of the file,
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* and that the new data won't completely replace the old data in
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* that range of the file.
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*/
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static bool nfs_full_page_write(struct page *page, loff_t pos, unsigned int len)
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{
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unsigned int pglen = nfs_page_length(page);
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unsigned int offset = pos & (PAGE_SIZE - 1);
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unsigned int end = offset + len;
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return !pglen || (end >= pglen && !offset);
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}
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static bool nfs_want_read_modify_write(struct file *file, struct page *page,
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loff_t pos, unsigned int len)
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{
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/*
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* Up-to-date pages, those with ongoing or full-page write
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* don't need read/modify/write
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*/
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if (PageUptodate(page) || PagePrivate(page) ||
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nfs_full_page_write(page, pos, len))
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return false;
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if (pnfs_ld_read_whole_page(file->f_mapping->host))
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return true;
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/* Open for reading too? */
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if (file->f_mode & FMODE_READ)
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return true;
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return false;
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}
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/*
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* This does the "real" work of the write. We must allocate and lock the
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* page to be sent back to the generic routine, which then copies the
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* data from user space.
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*
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* If the writer ends up delaying the write, the writer needs to
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* increment the page use counts until he is done with the page.
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*/
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static int nfs_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata)
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{
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int ret;
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pgoff_t index = pos >> PAGE_SHIFT;
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struct page *page;
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int once_thru = 0;
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dfprintk(PAGECACHE, "NFS: write_begin(%pD2(%lu), %u@%lld)\n",
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file, mapping->host->i_ino, len, (long long) pos);
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start:
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page = grab_cache_page_write_begin(mapping, index, flags);
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if (!page)
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return -ENOMEM;
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*pagep = page;
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ret = nfs_flush_incompatible(file, page);
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if (ret) {
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unlock_page(page);
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put_page(page);
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} else if (!once_thru &&
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nfs_want_read_modify_write(file, page, pos, len)) {
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once_thru = 1;
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ret = nfs_readpage(file, page);
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put_page(page);
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if (!ret)
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goto start;
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}
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return ret;
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}
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|
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static int nfs_write_end(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned copied,
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struct page *page, void *fsdata)
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{
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unsigned offset = pos & (PAGE_SIZE - 1);
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struct nfs_open_context *ctx = nfs_file_open_context(file);
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int status;
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dfprintk(PAGECACHE, "NFS: write_end(%pD2(%lu), %u@%lld)\n",
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file, mapping->host->i_ino, len, (long long) pos);
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/*
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* Zero any uninitialised parts of the page, and then mark the page
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* as up to date if it turns out that we're extending the file.
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*/
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if (!PageUptodate(page)) {
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unsigned pglen = nfs_page_length(page);
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unsigned end = offset + copied;
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|
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if (pglen == 0) {
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zero_user_segments(page, 0, offset,
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end, PAGE_SIZE);
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SetPageUptodate(page);
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} else if (end >= pglen) {
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zero_user_segment(page, end, PAGE_SIZE);
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if (offset == 0)
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SetPageUptodate(page);
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} else
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zero_user_segment(page, pglen, PAGE_SIZE);
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}
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|
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status = nfs_updatepage(file, page, offset, copied);
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|
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unlock_page(page);
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put_page(page);
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|
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if (status < 0)
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return status;
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NFS_I(mapping->host)->write_io += copied;
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|
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if (nfs_ctx_key_to_expire(ctx, mapping->host)) {
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status = nfs_wb_all(mapping->host);
|
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if (status < 0)
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return status;
|
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}
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|
|
return copied;
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}
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|
|
/*
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|
* Partially or wholly invalidate a page
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* - Release the private state associated with a page if undergoing complete
|
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* page invalidation
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|
* - Called if either PG_private or PG_fscache is set on the page
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|
* - Caller holds page lock
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*/
|
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static void nfs_invalidate_page(struct page *page, unsigned int offset,
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unsigned int length)
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{
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dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %u, %u)\n",
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page, offset, length);
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|
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if (offset != 0 || length < PAGE_SIZE)
|
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return;
|
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/* Cancel any unstarted writes on this page */
|
|
nfs_wb_page_cancel(page_file_mapping(page)->host, page);
|
|
|
|
nfs_fscache_invalidate_page(page, page->mapping->host);
|
|
}
|
|
|
|
/*
|
|
* Attempt to release the private state associated with a page
|
|
* - Called if either PG_private or PG_fscache is set on the page
|
|
* - Caller holds page lock
|
|
* - Return true (may release page) or false (may not)
|
|
*/
|
|
static int nfs_release_page(struct page *page, gfp_t gfp)
|
|
{
|
|
dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
|
|
|
|
/* If PagePrivate() is set, then the page is not freeable */
|
|
if (PagePrivate(page))
|
|
return 0;
|
|
return nfs_fscache_release_page(page, gfp);
|
|
}
|
|
|
|
static void nfs_check_dirty_writeback(struct page *page,
|
|
bool *dirty, bool *writeback)
|
|
{
|
|
struct nfs_inode *nfsi;
|
|
struct address_space *mapping = page_file_mapping(page);
|
|
|
|
if (!mapping || PageSwapCache(page))
|
|
return;
|
|
|
|
/*
|
|
* Check if an unstable page is currently being committed and
|
|
* if so, have the VM treat it as if the page is under writeback
|
|
* so it will not block due to pages that will shortly be freeable.
|
|
*/
|
|
nfsi = NFS_I(mapping->host);
|
|
if (atomic_read(&nfsi->commit_info.rpcs_out)) {
|
|
*writeback = true;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If PagePrivate() is set, then the page is not freeable and as the
|
|
* inode is not being committed, it's not going to be cleaned in the
|
|
* near future so treat it as dirty
|
|
*/
|
|
if (PagePrivate(page))
|
|
*dirty = true;
|
|
}
|
|
|
|
/*
|
|
* Attempt to clear the private state associated with a page when an error
|
|
* occurs that requires the cached contents of an inode to be written back or
|
|
* destroyed
|
|
* - Called if either PG_private or fscache is set on the page
|
|
* - Caller holds page lock
|
|
* - Return 0 if successful, -error otherwise
|
|
*/
|
|
static int nfs_launder_page(struct page *page)
|
|
{
|
|
struct inode *inode = page_file_mapping(page)->host;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
|
|
dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n",
|
|
inode->i_ino, (long long)page_offset(page));
|
|
|
|
nfs_fscache_wait_on_page_write(nfsi, page);
|
|
return nfs_wb_page(inode, page);
|
|
}
|
|
|
|
static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file,
|
|
sector_t *span)
|
|
{
|
|
unsigned long blocks;
|
|
long long isize;
|
|
struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);
|
|
struct inode *inode = file->f_mapping->host;
|
|
|
|
spin_lock(&inode->i_lock);
|
|
blocks = inode->i_blocks;
|
|
isize = inode->i_size;
|
|
spin_unlock(&inode->i_lock);
|
|
if (blocks*512 < isize) {
|
|
pr_warn("swap activate: swapfile has holes\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
*span = sis->pages;
|
|
|
|
return rpc_clnt_swap_activate(clnt);
|
|
}
|
|
|
|
static void nfs_swap_deactivate(struct file *file)
|
|
{
|
|
struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);
|
|
|
|
rpc_clnt_swap_deactivate(clnt);
|
|
}
|
|
|
|
const struct address_space_operations nfs_file_aops = {
|
|
.readpage = nfs_readpage,
|
|
.readpages = nfs_readpages,
|
|
.set_page_dirty = __set_page_dirty_nobuffers,
|
|
.writepage = nfs_writepage,
|
|
.writepages = nfs_writepages,
|
|
.write_begin = nfs_write_begin,
|
|
.write_end = nfs_write_end,
|
|
.invalidatepage = nfs_invalidate_page,
|
|
.releasepage = nfs_release_page,
|
|
.direct_IO = nfs_direct_IO,
|
|
#ifdef CONFIG_MIGRATION
|
|
.migratepage = nfs_migrate_page,
|
|
#endif
|
|
.launder_page = nfs_launder_page,
|
|
.is_dirty_writeback = nfs_check_dirty_writeback,
|
|
.error_remove_page = generic_error_remove_page,
|
|
.swap_activate = nfs_swap_activate,
|
|
.swap_deactivate = nfs_swap_deactivate,
|
|
};
|
|
|
|
/*
|
|
* Notification that a PTE pointing to an NFS page is about to be made
|
|
* writable, implying that someone is about to modify the page through a
|
|
* shared-writable mapping
|
|
*/
|
|
static vm_fault_t nfs_vm_page_mkwrite(struct vm_fault *vmf)
|
|
{
|
|
struct page *page = vmf->page;
|
|
struct file *filp = vmf->vma->vm_file;
|
|
struct inode *inode = file_inode(filp);
|
|
unsigned pagelen;
|
|
vm_fault_t ret = VM_FAULT_NOPAGE;
|
|
struct address_space *mapping;
|
|
|
|
dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%pD2(%lu), offset %lld)\n",
|
|
filp, filp->f_mapping->host->i_ino,
|
|
(long long)page_offset(page));
|
|
|
|
sb_start_pagefault(inode->i_sb);
|
|
|
|
/* make sure the cache has finished storing the page */
|
|
nfs_fscache_wait_on_page_write(NFS_I(inode), page);
|
|
|
|
wait_on_bit_action(&NFS_I(inode)->flags, NFS_INO_INVALIDATING,
|
|
nfs_wait_bit_killable, TASK_KILLABLE);
|
|
|
|
lock_page(page);
|
|
mapping = page_file_mapping(page);
|
|
if (mapping != inode->i_mapping)
|
|
goto out_unlock;
|
|
|
|
wait_on_page_writeback(page);
|
|
|
|
pagelen = nfs_page_length(page);
|
|
if (pagelen == 0)
|
|
goto out_unlock;
|
|
|
|
ret = VM_FAULT_LOCKED;
|
|
if (nfs_flush_incompatible(filp, page) == 0 &&
|
|
nfs_updatepage(filp, page, 0, pagelen) == 0)
|
|
goto out;
|
|
|
|
ret = VM_FAULT_SIGBUS;
|
|
out_unlock:
|
|
unlock_page(page);
|
|
out:
|
|
sb_end_pagefault(inode->i_sb);
|
|
return ret;
|
|
}
|
|
|
|
static const struct vm_operations_struct nfs_file_vm_ops = {
|
|
.fault = filemap_fault,
|
|
.map_pages = filemap_map_pages,
|
|
.page_mkwrite = nfs_vm_page_mkwrite,
|
|
};
|
|
|
|
static int nfs_need_check_write(struct file *filp, struct inode *inode,
|
|
int error)
|
|
{
|
|
struct nfs_open_context *ctx;
|
|
|
|
ctx = nfs_file_open_context(filp);
|
|
if (nfs_error_is_fatal_on_server(error) ||
|
|
nfs_ctx_key_to_expire(ctx, inode))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct inode *inode = file_inode(file);
|
|
unsigned long written = 0;
|
|
ssize_t result;
|
|
errseq_t since;
|
|
int error;
|
|
|
|
result = nfs_key_timeout_notify(file, inode);
|
|
if (result)
|
|
return result;
|
|
|
|
if (iocb->ki_flags & IOCB_DIRECT)
|
|
return nfs_file_direct_write(iocb, from);
|
|
|
|
dprintk("NFS: write(%pD2, %zu@%Ld)\n",
|
|
file, iov_iter_count(from), (long long) iocb->ki_pos);
|
|
|
|
if (IS_SWAPFILE(inode))
|
|
goto out_swapfile;
|
|
/*
|
|
* O_APPEND implies that we must revalidate the file length.
|
|
*/
|
|
if (iocb->ki_flags & IOCB_APPEND) {
|
|
result = nfs_revalidate_file_size(inode, file);
|
|
if (result)
|
|
goto out;
|
|
}
|
|
if (iocb->ki_pos > i_size_read(inode))
|
|
nfs_revalidate_mapping(inode, file->f_mapping);
|
|
|
|
since = filemap_sample_wb_err(file->f_mapping);
|
|
nfs_start_io_write(inode);
|
|
result = generic_write_checks(iocb, from);
|
|
if (result > 0) {
|
|
current->backing_dev_info = inode_to_bdi(inode);
|
|
result = generic_perform_write(file, from, iocb->ki_pos);
|
|
current->backing_dev_info = NULL;
|
|
}
|
|
nfs_end_io_write(inode);
|
|
if (result <= 0)
|
|
goto out;
|
|
|
|
written = result;
|
|
iocb->ki_pos += written;
|
|
result = generic_write_sync(iocb, written);
|
|
if (result < 0)
|
|
goto out;
|
|
|
|
/* Return error values */
|
|
error = filemap_check_wb_err(file->f_mapping, since);
|
|
if (nfs_need_check_write(file, inode, error)) {
|
|
int err = nfs_wb_all(inode);
|
|
if (err < 0)
|
|
result = err;
|
|
}
|
|
nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
|
|
out:
|
|
return result;
|
|
|
|
out_swapfile:
|
|
printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
|
|
return -ETXTBSY;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_file_write);
|
|
|
|
static int
|
|
do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
|
|
{
|
|
struct inode *inode = filp->f_mapping->host;
|
|
int status = 0;
|
|
unsigned int saved_type = fl->fl_type;
|
|
|
|
/* Try local locking first */
|
|
posix_test_lock(filp, fl);
|
|
if (fl->fl_type != F_UNLCK) {
|
|
/* found a conflict */
|
|
goto out;
|
|
}
|
|
fl->fl_type = saved_type;
|
|
|
|
if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
|
|
goto out_noconflict;
|
|
|
|
if (is_local)
|
|
goto out_noconflict;
|
|
|
|
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
|
|
out:
|
|
return status;
|
|
out_noconflict:
|
|
fl->fl_type = F_UNLCK;
|
|
goto out;
|
|
}
|
|
|
|
static int
|
|
do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
|
|
{
|
|
struct inode *inode = filp->f_mapping->host;
|
|
struct nfs_lock_context *l_ctx;
|
|
int status;
|
|
|
|
/*
|
|
* Flush all pending writes before doing anything
|
|
* with locks..
|
|
*/
|
|
nfs_wb_all(inode);
|
|
|
|
l_ctx = nfs_get_lock_context(nfs_file_open_context(filp));
|
|
if (!IS_ERR(l_ctx)) {
|
|
status = nfs_iocounter_wait(l_ctx);
|
|
nfs_put_lock_context(l_ctx);
|
|
/* NOTE: special case
|
|
* If we're signalled while cleaning up locks on process exit, we
|
|
* still need to complete the unlock.
|
|
*/
|
|
if (status < 0 && !(fl->fl_flags & FL_CLOSE))
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Use local locking if mounted with "-onolock" or with appropriate
|
|
* "-olocal_lock="
|
|
*/
|
|
if (!is_local)
|
|
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
|
|
else
|
|
status = locks_lock_file_wait(filp, fl);
|
|
return status;
|
|
}
|
|
|
|
static int
|
|
do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
|
|
{
|
|
struct inode *inode = filp->f_mapping->host;
|
|
int status;
|
|
|
|
/*
|
|
* Flush all pending writes before doing anything
|
|
* with locks..
|
|
*/
|
|
status = nfs_sync_mapping(filp->f_mapping);
|
|
if (status != 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Use local locking if mounted with "-onolock" or with appropriate
|
|
* "-olocal_lock="
|
|
*/
|
|
if (!is_local)
|
|
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
|
|
else
|
|
status = locks_lock_file_wait(filp, fl);
|
|
if (status < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Invalidate cache to prevent missing any changes. If
|
|
* the file is mapped, clear the page cache as well so
|
|
* those mappings will be loaded.
|
|
*
|
|
* This makes locking act as a cache coherency point.
|
|
*/
|
|
nfs_sync_mapping(filp->f_mapping);
|
|
if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) {
|
|
nfs_zap_caches(inode);
|
|
if (mapping_mapped(filp->f_mapping))
|
|
nfs_revalidate_mapping(inode, filp->f_mapping);
|
|
}
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Lock a (portion of) a file
|
|
*/
|
|
int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
|
|
{
|
|
struct inode *inode = filp->f_mapping->host;
|
|
int ret = -ENOLCK;
|
|
int is_local = 0;
|
|
|
|
dprintk("NFS: lock(%pD2, t=%x, fl=%x, r=%lld:%lld)\n",
|
|
filp, fl->fl_type, fl->fl_flags,
|
|
(long long)fl->fl_start, (long long)fl->fl_end);
|
|
|
|
nfs_inc_stats(inode, NFSIOS_VFSLOCK);
|
|
|
|
/* No mandatory locks over NFS */
|
|
if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
|
|
goto out_err;
|
|
|
|
if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL)
|
|
is_local = 1;
|
|
|
|
if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
|
|
ret = NFS_PROTO(inode)->lock_check_bounds(fl);
|
|
if (ret < 0)
|
|
goto out_err;
|
|
}
|
|
|
|
if (IS_GETLK(cmd))
|
|
ret = do_getlk(filp, cmd, fl, is_local);
|
|
else if (fl->fl_type == F_UNLCK)
|
|
ret = do_unlk(filp, cmd, fl, is_local);
|
|
else
|
|
ret = do_setlk(filp, cmd, fl, is_local);
|
|
out_err:
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_lock);
|
|
|
|
/*
|
|
* Lock a (portion of) a file
|
|
*/
|
|
int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
|
|
{
|
|
struct inode *inode = filp->f_mapping->host;
|
|
int is_local = 0;
|
|
|
|
dprintk("NFS: flock(%pD2, t=%x, fl=%x)\n",
|
|
filp, fl->fl_type, fl->fl_flags);
|
|
|
|
if (!(fl->fl_flags & FL_FLOCK))
|
|
return -ENOLCK;
|
|
|
|
/*
|
|
* The NFSv4 protocol doesn't support LOCK_MAND, which is not part of
|
|
* any standard. In principle we might be able to support LOCK_MAND
|
|
* on NFSv2/3 since NLMv3/4 support DOS share modes, but for now the
|
|
* NFS code is not set up for it.
|
|
*/
|
|
if (fl->fl_type & LOCK_MAND)
|
|
return -EINVAL;
|
|
|
|
if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK)
|
|
is_local = 1;
|
|
|
|
/* We're simulating flock() locks using posix locks on the server */
|
|
if (fl->fl_type == F_UNLCK)
|
|
return do_unlk(filp, cmd, fl, is_local);
|
|
return do_setlk(filp, cmd, fl, is_local);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_flock);
|
|
|
|
const struct file_operations nfs_file_operations = {
|
|
.llseek = nfs_file_llseek,
|
|
.read_iter = nfs_file_read,
|
|
.write_iter = nfs_file_write,
|
|
.mmap = nfs_file_mmap,
|
|
.open = nfs_file_open,
|
|
.flush = nfs_file_flush,
|
|
.release = nfs_file_release,
|
|
.fsync = nfs_file_fsync,
|
|
.lock = nfs_lock,
|
|
.flock = nfs_flock,
|
|
.splice_read = generic_file_splice_read,
|
|
.splice_write = iter_file_splice_write,
|
|
.check_flags = nfs_check_flags,
|
|
.setlease = simple_nosetlease,
|
|
};
|
|
EXPORT_SYMBOL_GPL(nfs_file_operations);
|