mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 21:16:53 +07:00
59953fba87
Highlights include: Stable patches: - Fix a regression in /proc/self/mountstats - Fix the pNFS flexfiles O_DIRECT support - Fix high load average due to callback thread sleeping Bugfixes: - Various patches to fix the pNFS layoutcommit support - Do not cache pNFS deviceids unless server notifications are enabled - Fix a SUNRPC transport reconnection regression - make debugfs file creation failure non-fatal in SUNRPC - Another fix for circular directory warnings on NFSv4 "junctioned" mountpoints - Fix locking around NFSv4.2 fallocate() support - Truncating NFSv4 file opens should also sync O_DIRECT writes - Prevent infinite loop in rpcrdma_ep_create() Features: - Various improvements to the RDMA transport code's handling of memory registration - Various code cleanups -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJVOmT6AAoJEGcL54qWCgDyrhYQAMPKXB55jrdOR/7UVSF/xPML 7OjMGHvBnTn/y0pNIyLyS1PjTZZsD/WZjoW9EFGpTv727qQNVoFxFRLNUcgi3NoL 1YledCkLf7Q32aqod93SRRFPc9hzBoKhOZpOzBuWaAviyAB3KLi70DWAq9qRReYM prXUQQjpW5FLU+B2ifaVc2RCnu/rZ2c02YdR2XdtkBaAJxuhB2vR8IY1evwjCv3R 5zyLDd9zSDDoArdpUzM97cxZPcYRSqbOwgTKvaaRnDDq/mKbKMZaqmEfjblwzNFt b43FbveJzZ3hlPADIpmaiMHjRTbxWjIKc9K1sOF2FPfcuPe2yM3DMAxDegUkEveS 7fkbv/qRZ30NqfchGanX/pmBlLOcdI76qe/bwhN19wCnw48O1eeHi1HK8rWGhU+E qcrRZ3ZS2ufP/MVBuhauy0qU9Q4wcEtm7NGGP1231ZtmfjHKyBa4pLirNfG1AlJt dK7tBrknVx+WVm/UddJp/fEsxbP0+fki6TwzioHUSWcz8rDVYF6PFT/QPM54SX2h 0oqwvu6d/uShpkVRm+fbje8FHmUxKdgqDsCYX2fNjWskh1oXSPsItvjqmTmTlE0i EBmBwVwI0uB1ZQ3PrJLadhRcO3ZJmLQ5gNj456dstvWy6UQds1xyIQ/DgvmlzxWO E9t0l18xHGRwbndsDa8f =j5dP -----END PGP SIGNATURE----- Merge tag 'nfs-for-4.1-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs Pull NFS client updates from Trond Myklebust: "Another set of mainly bugfixes and a couple of cleanups. No new functionality in this round. Highlights include: Stable patches: - Fix a regression in /proc/self/mountstats - Fix the pNFS flexfiles O_DIRECT support - Fix high load average due to callback thread sleeping Bugfixes: - Various patches to fix the pNFS layoutcommit support - Do not cache pNFS deviceids unless server notifications are enabled - Fix a SUNRPC transport reconnection regression - make debugfs file creation failure non-fatal in SUNRPC - Another fix for circular directory warnings on NFSv4 "junctioned" mountpoints - Fix locking around NFSv4.2 fallocate() support - Truncating NFSv4 file opens should also sync O_DIRECT writes - Prevent infinite loop in rpcrdma_ep_create() Features: - Various improvements to the RDMA transport code's handling of memory registration - Various code cleanups" * tag 'nfs-for-4.1-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (55 commits) fs/nfs: fix new compiler warning about boolean in switch nfs: Remove unneeded casts in nfs NFS: Don't attempt to decode missing directory entries Revert "nfs: replace nfs_add_stats with nfs_inc_stats when add one" NFS: Rename idmap.c to nfs4idmap.c NFS: Move nfs_idmap.h into fs/nfs/ NFS: Remove CONFIG_NFS_V4 checks from nfs_idmap.h NFS: Add a stub for GETDEVICELIST nfs: remove WARN_ON_ONCE from nfs_direct_good_bytes nfs: fix DIO good bytes calculation nfs: Fetch MOUNTED_ON_FILEID when updating an inode sunrpc: make debugfs file creation failure non-fatal nfs: fix high load average due to callback thread sleeping NFS: Reduce time spent holding the i_mutex during fallocate() NFS: Don't zap caches on fallocate() xprtrdma: Make rpcrdma_{un}map_one() into inline functions xprtrdma: Handle non-SEND completions via a callout xprtrdma: Add "open" memreg op xprtrdma: Add "destroy MRs" memreg op xprtrdma: Add "reset MRs" memreg op ...
948 lines
24 KiB
C
948 lines
24 KiB
C
/*
|
|
* linux/fs/nfs/file.c
|
|
*
|
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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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|
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#include <asm/uaccess.h>
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|
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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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|
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#include "nfstrace.h"
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|
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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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|
|
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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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|
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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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/*
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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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return nfs_release(inode, filp);
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}
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EXPORT_SYMBOL_GPL(nfs_file_release);
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|
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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 (nfs_have_delegated_attributes(inode))
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goto out_noreval;
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if (filp->f_flags & O_DIRECT)
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goto force_reval;
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if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
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goto force_reval;
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if (nfs_attribute_timeout(inode))
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goto force_reval;
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out_noreval:
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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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/*
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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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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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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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/*
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* If we're holding a write delegation, then just start the i/o
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* but don't wait for completion (or send a commit).
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*/
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if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
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return filemap_fdatawrite(file->f_mapping);
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/* Flush writes to the server and return any errors */
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return vfs_fsync(file, 0);
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}
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EXPORT_SYMBOL_GPL(nfs_file_flush);
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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, iocb->ki_pos);
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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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result = nfs_revalidate_mapping_protected(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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return result;
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}
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EXPORT_SYMBOL_GPL(nfs_file_read);
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ssize_t
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nfs_file_splice_read(struct file *filp, loff_t *ppos,
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struct pipe_inode_info *pipe, size_t count,
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unsigned int flags)
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{
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struct inode *inode = file_inode(filp);
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ssize_t res;
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dprintk("NFS: splice_read(%pD2, %lu@%Lu)\n",
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filp, (unsigned long) count, (unsigned long long) *ppos);
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res = nfs_revalidate_mapping_protected(inode, filp->f_mapping);
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if (!res) {
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res = generic_file_splice_read(filp, ppos, pipe, count, flags);
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if (res > 0)
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nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res);
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}
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return res;
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}
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EXPORT_SYMBOL_GPL(nfs_file_splice_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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* 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 occurred, and hence cause it to
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* fall back to doing a synchronous write.
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*/
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int
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nfs_file_fsync_commit(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 have_error, do_resend, status;
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int ret = 0;
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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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do_resend = test_and_clear_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
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have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
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status = nfs_commit_inode(inode, FLUSH_SYNC);
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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);
|
|
if (ret)
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|
goto out;
|
|
}
|
|
if (status < 0) {
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|
ret = status;
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|
goto out;
|
|
}
|
|
do_resend |= test_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
|
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if (do_resend)
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|
ret = -EAGAIN;
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out:
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return ret;
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}
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EXPORT_SYMBOL_GPL(nfs_file_fsync_commit);
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|
|
static int
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|
nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
|
|
{
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|
int ret;
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|
struct inode *inode = file_inode(file);
|
|
|
|
trace_nfs_fsync_enter(inode);
|
|
|
|
nfs_inode_dio_wait(inode);
|
|
do {
|
|
ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
|
|
if (ret != 0)
|
|
break;
|
|
mutex_lock(&inode->i_mutex);
|
|
ret = nfs_file_fsync_commit(file, start, end, datasync);
|
|
mutex_unlock(&inode->i_mutex);
|
|
/*
|
|
* If nfs_file_fsync_commit detected a server reboot, then
|
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* resend all dirty pages that might have been covered by
|
|
* the NFS_CONTEXT_RESEND_WRITES flag
|
|
*/
|
|
start = 0;
|
|
end = LLONG_MAX;
|
|
} while (ret == -EAGAIN);
|
|
|
|
trace_nfs_fsync_exit(inode, ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Decide whether a read/modify/write cycle may be more efficient
|
|
* then a modify/write/read cycle when writing to a page in the
|
|
* page cache.
|
|
*
|
|
* The modify/write/read cycle may occur if a page is read before
|
|
* being completely filled by the writer. In this situation, the
|
|
* page must be completely written to stable storage on the server
|
|
* before it can be refilled by reading in the page from the server.
|
|
* This can lead to expensive, small, FILE_SYNC mode writes being
|
|
* done.
|
|
*
|
|
* It may be more efficient to read the page first if the file is
|
|
* open for reading in addition to writing, the page is not marked
|
|
* as Uptodate, it is not dirty or waiting to be committed,
|
|
* indicating that it was previously allocated and then modified,
|
|
* that there were valid bytes of data in that range of the file,
|
|
* and that the new data won't completely replace the old data in
|
|
* that range of the file.
|
|
*/
|
|
static int nfs_want_read_modify_write(struct file *file, struct page *page,
|
|
loff_t pos, unsigned len)
|
|
{
|
|
unsigned int pglen = nfs_page_length(page);
|
|
unsigned int offset = pos & (PAGE_CACHE_SIZE - 1);
|
|
unsigned int end = offset + len;
|
|
|
|
if (pnfs_ld_read_whole_page(file->f_mapping->host)) {
|
|
if (!PageUptodate(page))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
if ((file->f_mode & FMODE_READ) && /* open for read? */
|
|
!PageUptodate(page) && /* Uptodate? */
|
|
!PagePrivate(page) && /* i/o request already? */
|
|
pglen && /* valid bytes of file? */
|
|
(end < pglen || offset)) /* replace all valid bytes? */
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* If the writer ends up delaying the write, the writer needs to
|
|
* increment the page use counts until he is done with the page.
|
|
*/
|
|
static int nfs_write_begin(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned flags,
|
|
struct page **pagep, void **fsdata)
|
|
{
|
|
int ret;
|
|
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
|
|
struct page *page;
|
|
int once_thru = 0;
|
|
|
|
dfprintk(PAGECACHE, "NFS: write_begin(%pD2(%lu), %u@%lld)\n",
|
|
file, mapping->host->i_ino, len, (long long) pos);
|
|
|
|
start:
|
|
/*
|
|
* Prevent starvation issues if someone is doing a consistency
|
|
* sync-to-disk
|
|
*/
|
|
ret = wait_on_bit_action(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING,
|
|
nfs_wait_bit_killable, TASK_KILLABLE);
|
|
if (ret)
|
|
return ret;
|
|
/*
|
|
* Wait for O_DIRECT to complete
|
|
*/
|
|
nfs_inode_dio_wait(mapping->host);
|
|
|
|
page = grab_cache_page_write_begin(mapping, index, flags);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
*pagep = page;
|
|
|
|
ret = nfs_flush_incompatible(file, page);
|
|
if (ret) {
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
} else if (!once_thru &&
|
|
nfs_want_read_modify_write(file, page, pos, len)) {
|
|
once_thru = 1;
|
|
ret = nfs_readpage(file, page);
|
|
page_cache_release(page);
|
|
if (!ret)
|
|
goto start;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int nfs_write_end(struct file *file, struct address_space *mapping,
|
|
loff_t pos, unsigned len, unsigned copied,
|
|
struct page *page, void *fsdata)
|
|
{
|
|
unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
|
|
struct nfs_open_context *ctx = nfs_file_open_context(file);
|
|
int status;
|
|
|
|
dfprintk(PAGECACHE, "NFS: write_end(%pD2(%lu), %u@%lld)\n",
|
|
file, mapping->host->i_ino, len, (long long) pos);
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
status = nfs_updatepage(file, page, offset, copied);
|
|
|
|
unlock_page(page);
|
|
page_cache_release(page);
|
|
|
|
if (status < 0)
|
|
return status;
|
|
NFS_I(mapping->host)->write_io += copied;
|
|
|
|
if (nfs_ctx_key_to_expire(ctx)) {
|
|
status = nfs_wb_all(mapping->host);
|
|
if (status < 0)
|
|
return status;
|
|
}
|
|
|
|
return copied;
|
|
}
|
|
|
|
/*
|
|
* Partially or wholly invalidate a page
|
|
* - Release the private state associated with a page if undergoing complete
|
|
* page invalidation
|
|
* - Called if either PG_private or PG_fscache is set on the page
|
|
* - Caller holds page lock
|
|
*/
|
|
static void nfs_invalidate_page(struct page *page, unsigned int offset,
|
|
unsigned int length)
|
|
{
|
|
dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %u, %u)\n",
|
|
page, offset, length);
|
|
|
|
if (offset != 0 || length < PAGE_CACHE_SIZE)
|
|
return;
|
|
/* 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)
|
|
{
|
|
struct address_space *mapping = page->mapping;
|
|
|
|
dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
|
|
|
|
/* Always try to initiate a 'commit' if relevant, but only
|
|
* wait for it if __GFP_WAIT is set. Even then, only wait 1
|
|
* second and only if the 'bdi' is not congested.
|
|
* Waiting indefinitely can cause deadlocks when the NFS
|
|
* server is on this machine, when a new TCP connection is
|
|
* needed and in other rare cases. There is no particular
|
|
* need to wait extensively here. A short wait has the
|
|
* benefit that someone else can worry about the freezer.
|
|
*/
|
|
if (mapping) {
|
|
struct nfs_server *nfss = NFS_SERVER(mapping->host);
|
|
nfs_commit_inode(mapping->host, 0);
|
|
if ((gfp & __GFP_WAIT) &&
|
|
!bdi_write_congested(&nfss->backing_dev_info)) {
|
|
wait_on_page_bit_killable_timeout(page, PG_private,
|
|
HZ);
|
|
if (PagePrivate(page))
|
|
set_bdi_congested(&nfss->backing_dev_info,
|
|
BLK_RW_ASYNC);
|
|
}
|
|
}
|
|
/* 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 (test_bit(NFS_INO_COMMIT, &nfsi->flags)) {
|
|
*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);
|
|
}
|
|
|
|
#ifdef CONFIG_NFS_SWAP
|
|
static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file,
|
|
sector_t *span)
|
|
{
|
|
int ret;
|
|
struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);
|
|
|
|
*span = sis->pages;
|
|
|
|
rcu_read_lock();
|
|
ret = xs_swapper(rcu_dereference(clnt->cl_xprt), 1);
|
|
rcu_read_unlock();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void nfs_swap_deactivate(struct file *file)
|
|
{
|
|
struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);
|
|
|
|
rcu_read_lock();
|
|
xs_swapper(rcu_dereference(clnt->cl_xprt), 0);
|
|
rcu_read_unlock();
|
|
}
|
|
#endif
|
|
|
|
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,
|
|
.migratepage = nfs_migrate_page,
|
|
.launder_page = nfs_launder_page,
|
|
.is_dirty_writeback = nfs_check_dirty_writeback,
|
|
.error_remove_page = generic_error_remove_page,
|
|
#ifdef CONFIG_NFS_SWAP
|
|
.swap_activate = nfs_swap_activate,
|
|
.swap_deactivate = nfs_swap_deactivate,
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* 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 int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
struct page *page = vmf->page;
|
|
struct file *filp = vma->vm_file;
|
|
struct inode *inode = file_inode(filp);
|
|
unsigned pagelen;
|
|
int 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));
|
|
|
|
/* 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:
|
|
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_sync_write(struct file *filp, struct inode *inode)
|
|
{
|
|
struct nfs_open_context *ctx;
|
|
|
|
if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC))
|
|
return 1;
|
|
ctx = nfs_file_open_context(filp);
|
|
if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags) ||
|
|
nfs_ctx_key_to_expire(ctx))
|
|
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;
|
|
size_t count = iov_iter_count(from);
|
|
|
|
result = nfs_key_timeout_notify(file, inode);
|
|
if (result)
|
|
return result;
|
|
|
|
if (iocb->ki_flags & IOCB_DIRECT) {
|
|
result = generic_write_checks(iocb, from);
|
|
if (result <= 0)
|
|
return result;
|
|
return nfs_file_direct_write(iocb, from);
|
|
}
|
|
|
|
dprintk("NFS: write(%pD2, %zu@%Ld)\n",
|
|
file, count, (long long) iocb->ki_pos);
|
|
|
|
result = -EBUSY;
|
|
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;
|
|
}
|
|
|
|
result = count;
|
|
if (!count)
|
|
goto out;
|
|
|
|
result = generic_file_write_iter(iocb, from);
|
|
if (result > 0)
|
|
written = result;
|
|
|
|
/* Return error values for O_DSYNC and IS_SYNC() */
|
|
if (result >= 0 && nfs_need_sync_write(file, inode)) {
|
|
int err = vfs_fsync(file, 0);
|
|
if (err < 0)
|
|
result = err;
|
|
}
|
|
if (result > 0)
|
|
nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
|
|
out:
|
|
return result;
|
|
|
|
out_swapfile:
|
|
printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
|
|
goto out;
|
|
}
|
|
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_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();
|
|
}
|
|
return res;
|
|
}
|
|
|
|
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..
|
|
*/
|
|
vfs_fsync(filp, 0);
|
|
|
|
l_ctx = nfs_get_lock_context(nfs_file_open_context(filp));
|
|
if (!IS_ERR(l_ctx)) {
|
|
status = nfs_iocounter_wait(&l_ctx->io_count);
|
|
nfs_put_lock_context(l_ctx);
|
|
if (status < 0)
|
|
return status;
|
|
}
|
|
|
|
/* NOTE: special case
|
|
* If we're signalled while cleaning up locks on process exit, we
|
|
* still need to complete the unlock.
|
|
*/
|
|
/*
|
|
* 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 = do_vfs_lock(filp, fl);
|
|
return status;
|
|
}
|
|
|
|
static int
|
|
is_time_granular(struct timespec *ts) {
|
|
return ((ts->tv_sec == 0) && (ts->tv_nsec <= 1000));
|
|
}
|
|
|
|
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 = do_vfs_lock(filp, fl);
|
|
if (status < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Revalidate the cache if the server has time stamps granular
|
|
* enough to detect subsecond changes. Otherwise, clear the
|
|
* cache to prevent missing any changes.
|
|
*
|
|
* This makes locking act as a cache coherency point.
|
|
*/
|
|
nfs_sync_mapping(filp->f_mapping);
|
|
if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) {
|
|
if (is_time_granular(&NFS_SERVER(inode)->time_delta))
|
|
__nfs_revalidate_inode(NFS_SERVER(inode), inode);
|
|
else
|
|
nfs_zap_caches(inode);
|
|
}
|
|
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 = nfs_file_splice_read,
|
|
.splice_write = iter_file_splice_write,
|
|
.check_flags = nfs_check_flags,
|
|
.setlease = simple_nosetlease,
|
|
};
|
|
EXPORT_SYMBOL_GPL(nfs_file_operations);
|