mirror of
https://github.com/torvalds/linux.git
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90c90cda05
- Fix a potential log livelock on busy filesystems when there's so much work going on that we can't finish a quotaoff before filling up the log by removing the ability to disable quota accounting. - Introduce the ability to use per-CPU data structures in XFS so that we can do a better job of maintaining CPU locality for certain operations. - Defer inode inactivation work to per-CPU lists, which will help us batch that processing. Deletions of large sparse files will *appear* to run faster, but all that means is that we've moved the work to the backend. - Drop the EXPERIMENTAL warnings from the y2038+ support and the inode btree counters, since it's been nearly a year and no complaints have come in. - Remove more of our bespoke kmem* variants in favor of using the standard Linux calls. - Prepare for the addition of log incompat features in upcoming cycles by actually adding code to support this. - Small cleanups of the xattr code in preparation for landing support for full logging of extended attribute updates in a future cycle. - Replace the various log shutdown state and flag code all over xfs with a single atomic bit flag. - Fix a serious log recovery bug where log item replay can be skipped based on the start lsn of a transaction even though the transaction commit lsn is the key data point for that by enforcing start lsns to appear in the log in the same order as commit lsns. - Enable pipelining in the code that pushes log items to disk. - Drop ->writepage. - Fix some bugs in GETFSMAP where the last fsmap record reported for a device could extend beyond the end of the device, and a separate bug where query keys for one device could be applied to another. - Don't let GETFSMAP query functions edit their input parameters. - Small cleanups to the scrub code's handling of perag structures. - Small cleanups to the incore inode tree walk code. - Constify btree function parameters that aren't changed, so that there will never again be confusion about range query functions changing their input parameters. - Standardize the format and names of tracepoint data attributes. - Clean up all the mount state and feature flags to use wrapped bitset functions instead of inconsistently open-coded flag checks. - Fix some confusion between xfs_buf hash table key variable vs. block number. - Fix a mis-interaction with iomap where we reported shared delalloc cow fork extents to iomap, which would cause the iomap unshare operation to return IO errors unnecessarily. - Fix DONTCACHE behavior. -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEUzaAxoMeQq6m2jMV+H93GTRKtOsFAmEnwqcACgkQ+H93GTRK tOtpZg/9G1RD9oDbVhKJy67bxkeLPX990dUtQFhcVjL3AMMyCJez2PBTqkQY3tL9 WDQveIF0UL5TjP5QUO2/6fncIXBmf5yXtinkfeQwkvkStb/yxs10zlpn2ZDEvJ7H EUWwkV3cBY6Q+ftJIfXJmNW6eCcaxYs6KFiBwodbcoBxy2dIx6KFBQuqwtxOA97s ZYfv1mPGOIg6AVJN9oxFWtF36qM8loFDNQeZj1ATfCsP25VNHbQf7YOFnJEnwLOB rzz2zKQ3lP0hWavA6M2lX+IGymDphngx7qe4lZYcjAsh2BzL0IZf0QmFrXGQKuY/ kD0dWeStM8OHQbqCdkYx4XxcjucvJ7qmIYCtrWdpFqrrrQHygaJW6nI8LgsNTdvb OPXpPPz58jdGY3ATaRYX/IFmpJExj655ZHUfpkeVGacBTa5KCVDykYKv1eYOfNsk Aj+bZ4g++bx3dlGFHGsPScRn+hwg5h/+UyQJpAYupuaUsq3rpBhH/bhAJNyPUsYu ej8LIeAWB3EPLozT4ewop8G0WWDBOe0MlYeO5gQho2AfFZzFInf15cSR62KZqx+v XTZgITnnp0ND4wzgqAhgdU4USS9z5MtHGvhSkuYejg85R/bKirrwRu2P0n681sHv UioiIVbXGWSAJqDQicfSjncafS3POIAUmMt4tgmDI33/3mTKwZQ= =HPJr -----END PGP SIGNATURE----- Merge tag 'xfs-5.15-merge-6' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux Pull xfs updates from Darrick Wong: "There's a lot in this cycle. Starting with bug fixes: To avoid livelocks between the logging code and the quota code, we've disabled the ability of quotaoff to turn off quota accounting. (Admins can still disable quota enforcement, but truly turning off accounting requires a remount.) We've tried to do this in a careful enough way that there shouldn't be any user visible effects aside from quotaoff no longer randomly hanging the system. We've also fixed some bugs in runtime log behavior that could trip up log recovery if (otherwise unrelated) transactions manage to start and commit concurrently; some bugs in the GETFSMAP ioctl where we would incorrectly restrict the range of records output if the two xfs devices are of different sizes; a bug that resulted in fallocate funshare failing unnecessarily; and broken behavior in the xfs inode cache when DONTCACHE is in play. As for new features: we now batch inode inactivations in percpu background threads, which sharply decreases frontend thread wait time when performing file deletions and should improve overall directory tree deletion times. This eliminates both the problem where closing an unlinked file (especially on a frozen fs) can stall for a long time, and should also ease complaints about direct reclaim bogging down on unlinked file cleanup. Starting with this release, we've enabled pipelining of the XFS log. On workloads with high rates of metadata updates to different shards of the filesystem, multiple threads can be used to format committed log updates into log checkpoints. Lastly, with this release, two new features have graduated to supported status: inode btree counters (for faster mounts), and support for dates beyond Y2038. Expect these to be enabled by default in a future release of xfsprogs. Summary: - Fix a potential log livelock on busy filesystems when there's so much work going on that we can't finish a quotaoff before filling up the log by removing the ability to disable quota accounting. - Introduce the ability to use per-CPU data structures in XFS so that we can do a better job of maintaining CPU locality for certain operations. - Defer inode inactivation work to per-CPU lists, which will help us batch that processing. Deletions of large sparse files will *appear* to run faster, but all that means is that we've moved the work to the backend. - Drop the EXPERIMENTAL warnings from the y2038+ support and the inode btree counters, since it's been nearly a year and no complaints have come in. - Remove more of our bespoke kmem* variants in favor of using the standard Linux calls. - Prepare for the addition of log incompat features in upcoming cycles by actually adding code to support this. - Small cleanups of the xattr code in preparation for landing support for full logging of extended attribute updates in a future cycle. - Replace the various log shutdown state and flag code all over xfs with a single atomic bit flag. - Fix a serious log recovery bug where log item replay can be skipped based on the start lsn of a transaction even though the transaction commit lsn is the key data point for that by enforcing start lsns to appear in the log in the same order as commit lsns. - Enable pipelining in the code that pushes log items to disk. - Drop ->writepage. - Fix some bugs in GETFSMAP where the last fsmap record reported for a device could extend beyond the end of the device, and a separate bug where query keys for one device could be applied to another. - Don't let GETFSMAP query functions edit their input parameters. - Small cleanups to the scrub code's handling of perag structures. - Small cleanups to the incore inode tree walk code. - Constify btree function parameters that aren't changed, so that there will never again be confusion about range query functions changing their input parameters. - Standardize the format and names of tracepoint data attributes. - Clean up all the mount state and feature flags to use wrapped bitset functions instead of inconsistently open-coded flag checks. - Fix some confusion between xfs_buf hash table key variable vs. block number. - Fix a mis-interaction with iomap where we reported shared delalloc cow fork extents to iomap, which would cause the iomap unshare operation to return IO errors unnecessarily. - Fix DONTCACHE behavior" * tag 'xfs-5.15-merge-6' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux: (103 commits) xfs: fix I_DONTCACHE xfs: only set IOMAP_F_SHARED when providing a srcmap to a write xfs: fix perag structure refcounting error when scrub fails xfs: rename buffer cache index variable b_bn xfs: convert bp->b_bn references to xfs_buf_daddr() xfs: introduce xfs_buf_daddr() xfs: kill xfs_sb_version_has_v3inode() xfs: introduce xfs_sb_is_v5 helper xfs: remove unused xfs_sb_version_has wrappers xfs: convert xfs_sb_version_has checks to use mount features xfs: convert scrub to use mount-based feature checks xfs: open code sb verifier feature checks xfs: convert xfs_fs_geometry to use mount feature checks xfs: replace XFS_FORCED_SHUTDOWN with xfs_is_shutdown xfs: convert remaining mount flags to state flags xfs: convert mount flags to features xfs: consolidate mount option features in m_features xfs: replace xfs_sb_version checks with feature flag checks xfs: reflect sb features in xfs_mount xfs: rework attr2 feature and mount options ...
1482 lines
37 KiB
C
1482 lines
37 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_trans.h"
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#include "xfs_inode_item.h"
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#include "xfs_bmap.h"
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#include "xfs_bmap_util.h"
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#include "xfs_dir2.h"
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#include "xfs_dir2_priv.h"
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#include "xfs_ioctl.h"
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#include "xfs_trace.h"
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#include "xfs_log.h"
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#include "xfs_icache.h"
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#include "xfs_pnfs.h"
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#include "xfs_iomap.h"
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#include "xfs_reflink.h"
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#include <linux/falloc.h>
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#include <linux/backing-dev.h>
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#include <linux/mman.h>
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#include <linux/fadvise.h>
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#include <linux/mount.h>
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static const struct vm_operations_struct xfs_file_vm_ops;
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/*
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* Decide if the given file range is aligned to the size of the fundamental
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* allocation unit for the file.
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*/
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static bool
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xfs_is_falloc_aligned(
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struct xfs_inode *ip,
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loff_t pos,
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long long int len)
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{
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struct xfs_mount *mp = ip->i_mount;
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uint64_t mask;
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if (XFS_IS_REALTIME_INODE(ip)) {
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if (!is_power_of_2(mp->m_sb.sb_rextsize)) {
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u64 rextbytes;
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u32 mod;
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rextbytes = XFS_FSB_TO_B(mp, mp->m_sb.sb_rextsize);
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div_u64_rem(pos, rextbytes, &mod);
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if (mod)
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return false;
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div_u64_rem(len, rextbytes, &mod);
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return mod == 0;
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}
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mask = XFS_FSB_TO_B(mp, mp->m_sb.sb_rextsize) - 1;
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} else {
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mask = mp->m_sb.sb_blocksize - 1;
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}
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return !((pos | len) & mask);
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}
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int
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xfs_update_prealloc_flags(
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struct xfs_inode *ip,
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enum xfs_prealloc_flags flags)
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{
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struct xfs_trans *tp;
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int error;
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error = xfs_trans_alloc(ip->i_mount, &M_RES(ip->i_mount)->tr_writeid,
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0, 0, 0, &tp);
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if (error)
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return error;
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
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if (!(flags & XFS_PREALLOC_INVISIBLE)) {
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VFS_I(ip)->i_mode &= ~S_ISUID;
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if (VFS_I(ip)->i_mode & S_IXGRP)
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VFS_I(ip)->i_mode &= ~S_ISGID;
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xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
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}
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if (flags & XFS_PREALLOC_SET)
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ip->i_diflags |= XFS_DIFLAG_PREALLOC;
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if (flags & XFS_PREALLOC_CLEAR)
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ip->i_diflags &= ~XFS_DIFLAG_PREALLOC;
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xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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if (flags & XFS_PREALLOC_SYNC)
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xfs_trans_set_sync(tp);
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return xfs_trans_commit(tp);
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}
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/*
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* Fsync operations on directories are much simpler than on regular files,
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* as there is no file data to flush, and thus also no need for explicit
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* cache flush operations, and there are no non-transaction metadata updates
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* on directories either.
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*/
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STATIC int
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xfs_dir_fsync(
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struct file *file,
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loff_t start,
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loff_t end,
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int datasync)
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{
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struct xfs_inode *ip = XFS_I(file->f_mapping->host);
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trace_xfs_dir_fsync(ip);
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return xfs_log_force_inode(ip);
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}
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static xfs_csn_t
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xfs_fsync_seq(
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struct xfs_inode *ip,
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bool datasync)
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{
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if (!xfs_ipincount(ip))
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return 0;
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if (datasync && !(ip->i_itemp->ili_fsync_fields & ~XFS_ILOG_TIMESTAMP))
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return 0;
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return ip->i_itemp->ili_commit_seq;
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}
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/*
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* All metadata updates are logged, which means that we just have to flush the
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* log up to the latest LSN that touched the inode.
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*
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* If we have concurrent fsync/fdatasync() calls, we need them to all block on
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* the log force before we clear the ili_fsync_fields field. This ensures that
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* we don't get a racing sync operation that does not wait for the metadata to
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* hit the journal before returning. If we race with clearing ili_fsync_fields,
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* then all that will happen is the log force will do nothing as the lsn will
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* already be on disk. We can't race with setting ili_fsync_fields because that
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* is done under XFS_ILOCK_EXCL, and that can't happen because we hold the lock
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* shared until after the ili_fsync_fields is cleared.
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*/
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static int
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xfs_fsync_flush_log(
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struct xfs_inode *ip,
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bool datasync,
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int *log_flushed)
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{
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int error = 0;
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xfs_csn_t seq;
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xfs_ilock(ip, XFS_ILOCK_SHARED);
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seq = xfs_fsync_seq(ip, datasync);
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if (seq) {
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error = xfs_log_force_seq(ip->i_mount, seq, XFS_LOG_SYNC,
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log_flushed);
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spin_lock(&ip->i_itemp->ili_lock);
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ip->i_itemp->ili_fsync_fields = 0;
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spin_unlock(&ip->i_itemp->ili_lock);
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}
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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return error;
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}
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STATIC int
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xfs_file_fsync(
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struct file *file,
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loff_t start,
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loff_t end,
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int datasync)
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{
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struct xfs_inode *ip = XFS_I(file->f_mapping->host);
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struct xfs_mount *mp = ip->i_mount;
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int error = 0;
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int log_flushed = 0;
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trace_xfs_file_fsync(ip);
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error = file_write_and_wait_range(file, start, end);
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if (error)
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return error;
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if (xfs_is_shutdown(mp))
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return -EIO;
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xfs_iflags_clear(ip, XFS_ITRUNCATED);
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/*
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* If we have an RT and/or log subvolume we need to make sure to flush
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* the write cache the device used for file data first. This is to
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* ensure newly written file data make it to disk before logging the new
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* inode size in case of an extending write.
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*/
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if (XFS_IS_REALTIME_INODE(ip))
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blkdev_issue_flush(mp->m_rtdev_targp->bt_bdev);
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else if (mp->m_logdev_targp != mp->m_ddev_targp)
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blkdev_issue_flush(mp->m_ddev_targp->bt_bdev);
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/*
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* Any inode that has dirty modifications in the log is pinned. The
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* racy check here for a pinned inode while not catch modifications
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* that happen concurrently to the fsync call, but fsync semantics
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* only require to sync previously completed I/O.
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*/
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if (xfs_ipincount(ip))
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error = xfs_fsync_flush_log(ip, datasync, &log_flushed);
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/*
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* If we only have a single device, and the log force about was
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* a no-op we might have to flush the data device cache here.
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* This can only happen for fdatasync/O_DSYNC if we were overwriting
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* an already allocated file and thus do not have any metadata to
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* commit.
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*/
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if (!log_flushed && !XFS_IS_REALTIME_INODE(ip) &&
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mp->m_logdev_targp == mp->m_ddev_targp)
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blkdev_issue_flush(mp->m_ddev_targp->bt_bdev);
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return error;
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}
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static int
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xfs_ilock_iocb(
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struct kiocb *iocb,
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unsigned int lock_mode)
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{
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struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp));
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if (iocb->ki_flags & IOCB_NOWAIT) {
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if (!xfs_ilock_nowait(ip, lock_mode))
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return -EAGAIN;
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} else {
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xfs_ilock(ip, lock_mode);
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}
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return 0;
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}
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STATIC ssize_t
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xfs_file_dio_read(
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struct kiocb *iocb,
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struct iov_iter *to)
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{
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struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp));
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ssize_t ret;
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trace_xfs_file_direct_read(iocb, to);
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if (!iov_iter_count(to))
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return 0; /* skip atime */
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file_accessed(iocb->ki_filp);
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ret = xfs_ilock_iocb(iocb, XFS_IOLOCK_SHARED);
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if (ret)
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return ret;
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ret = iomap_dio_rw(iocb, to, &xfs_read_iomap_ops, NULL, 0);
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xfs_iunlock(ip, XFS_IOLOCK_SHARED);
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return ret;
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}
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static noinline ssize_t
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xfs_file_dax_read(
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struct kiocb *iocb,
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struct iov_iter *to)
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{
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struct xfs_inode *ip = XFS_I(iocb->ki_filp->f_mapping->host);
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ssize_t ret = 0;
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trace_xfs_file_dax_read(iocb, to);
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if (!iov_iter_count(to))
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return 0; /* skip atime */
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ret = xfs_ilock_iocb(iocb, XFS_IOLOCK_SHARED);
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if (ret)
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return ret;
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ret = dax_iomap_rw(iocb, to, &xfs_read_iomap_ops);
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xfs_iunlock(ip, XFS_IOLOCK_SHARED);
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file_accessed(iocb->ki_filp);
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return ret;
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}
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STATIC ssize_t
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xfs_file_buffered_read(
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struct kiocb *iocb,
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struct iov_iter *to)
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{
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struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp));
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ssize_t ret;
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trace_xfs_file_buffered_read(iocb, to);
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ret = xfs_ilock_iocb(iocb, XFS_IOLOCK_SHARED);
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if (ret)
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return ret;
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ret = generic_file_read_iter(iocb, to);
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xfs_iunlock(ip, XFS_IOLOCK_SHARED);
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return ret;
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}
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STATIC ssize_t
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xfs_file_read_iter(
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struct kiocb *iocb,
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struct iov_iter *to)
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{
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struct inode *inode = file_inode(iocb->ki_filp);
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struct xfs_mount *mp = XFS_I(inode)->i_mount;
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ssize_t ret = 0;
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XFS_STATS_INC(mp, xs_read_calls);
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if (xfs_is_shutdown(mp))
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return -EIO;
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if (IS_DAX(inode))
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ret = xfs_file_dax_read(iocb, to);
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else if (iocb->ki_flags & IOCB_DIRECT)
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ret = xfs_file_dio_read(iocb, to);
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else
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ret = xfs_file_buffered_read(iocb, to);
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if (ret > 0)
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XFS_STATS_ADD(mp, xs_read_bytes, ret);
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return ret;
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}
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/*
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* Common pre-write limit and setup checks.
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*
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* Called with the iolocked held either shared and exclusive according to
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* @iolock, and returns with it held. Might upgrade the iolock to exclusive
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* if called for a direct write beyond i_size.
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*/
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STATIC ssize_t
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xfs_file_write_checks(
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|
struct kiocb *iocb,
|
|
struct iov_iter *from,
|
|
int *iolock)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct inode *inode = file->f_mapping->host;
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
ssize_t error = 0;
|
|
size_t count = iov_iter_count(from);
|
|
bool drained_dio = false;
|
|
loff_t isize;
|
|
|
|
restart:
|
|
error = generic_write_checks(iocb, from);
|
|
if (error <= 0)
|
|
return error;
|
|
|
|
if (iocb->ki_flags & IOCB_NOWAIT) {
|
|
error = break_layout(inode, false);
|
|
if (error == -EWOULDBLOCK)
|
|
error = -EAGAIN;
|
|
} else {
|
|
error = xfs_break_layouts(inode, iolock, BREAK_WRITE);
|
|
}
|
|
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* For changing security info in file_remove_privs() we need i_rwsem
|
|
* exclusively.
|
|
*/
|
|
if (*iolock == XFS_IOLOCK_SHARED && !IS_NOSEC(inode)) {
|
|
xfs_iunlock(ip, *iolock);
|
|
*iolock = XFS_IOLOCK_EXCL;
|
|
error = xfs_ilock_iocb(iocb, *iolock);
|
|
if (error) {
|
|
*iolock = 0;
|
|
return error;
|
|
}
|
|
goto restart;
|
|
}
|
|
|
|
/*
|
|
* If the offset is beyond the size of the file, we need to zero any
|
|
* blocks that fall between the existing EOF and the start of this
|
|
* write. If zeroing is needed and we are currently holding the iolock
|
|
* shared, we need to update it to exclusive which implies having to
|
|
* redo all checks before.
|
|
*
|
|
* We need to serialise against EOF updates that occur in IO completions
|
|
* here. We want to make sure that nobody is changing the size while we
|
|
* do this check until we have placed an IO barrier (i.e. hold the
|
|
* XFS_IOLOCK_EXCL) that prevents new IO from being dispatched. The
|
|
* spinlock effectively forms a memory barrier once we have the
|
|
* XFS_IOLOCK_EXCL so we are guaranteed to see the latest EOF value and
|
|
* hence be able to correctly determine if we need to run zeroing.
|
|
*
|
|
* We can do an unlocked check here safely as IO completion can only
|
|
* extend EOF. Truncate is locked out at this point, so the EOF can
|
|
* not move backwards, only forwards. Hence we only need to take the
|
|
* slow path and spin locks when we are at or beyond the current EOF.
|
|
*/
|
|
if (iocb->ki_pos <= i_size_read(inode))
|
|
goto out;
|
|
|
|
spin_lock(&ip->i_flags_lock);
|
|
isize = i_size_read(inode);
|
|
if (iocb->ki_pos > isize) {
|
|
spin_unlock(&ip->i_flags_lock);
|
|
|
|
if (iocb->ki_flags & IOCB_NOWAIT)
|
|
return -EAGAIN;
|
|
|
|
if (!drained_dio) {
|
|
if (*iolock == XFS_IOLOCK_SHARED) {
|
|
xfs_iunlock(ip, *iolock);
|
|
*iolock = XFS_IOLOCK_EXCL;
|
|
xfs_ilock(ip, *iolock);
|
|
iov_iter_reexpand(from, count);
|
|
}
|
|
/*
|
|
* We now have an IO submission barrier in place, but
|
|
* AIO can do EOF updates during IO completion and hence
|
|
* we now need to wait for all of them to drain. Non-AIO
|
|
* DIO will have drained before we are given the
|
|
* XFS_IOLOCK_EXCL, and so for most cases this wait is a
|
|
* no-op.
|
|
*/
|
|
inode_dio_wait(inode);
|
|
drained_dio = true;
|
|
goto restart;
|
|
}
|
|
|
|
trace_xfs_zero_eof(ip, isize, iocb->ki_pos - isize);
|
|
error = iomap_zero_range(inode, isize, iocb->ki_pos - isize,
|
|
NULL, &xfs_buffered_write_iomap_ops);
|
|
if (error)
|
|
return error;
|
|
} else
|
|
spin_unlock(&ip->i_flags_lock);
|
|
|
|
out:
|
|
return file_modified(file);
|
|
}
|
|
|
|
static int
|
|
xfs_dio_write_end_io(
|
|
struct kiocb *iocb,
|
|
ssize_t size,
|
|
int error,
|
|
unsigned flags)
|
|
{
|
|
struct inode *inode = file_inode(iocb->ki_filp);
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
loff_t offset = iocb->ki_pos;
|
|
unsigned int nofs_flag;
|
|
|
|
trace_xfs_end_io_direct_write(ip, offset, size);
|
|
|
|
if (xfs_is_shutdown(ip->i_mount))
|
|
return -EIO;
|
|
|
|
if (error)
|
|
return error;
|
|
if (!size)
|
|
return 0;
|
|
|
|
/*
|
|
* Capture amount written on completion as we can't reliably account
|
|
* for it on submission.
|
|
*/
|
|
XFS_STATS_ADD(ip->i_mount, xs_write_bytes, size);
|
|
|
|
/*
|
|
* We can allocate memory here while doing writeback on behalf of
|
|
* memory reclaim. To avoid memory allocation deadlocks set the
|
|
* task-wide nofs context for the following operations.
|
|
*/
|
|
nofs_flag = memalloc_nofs_save();
|
|
|
|
if (flags & IOMAP_DIO_COW) {
|
|
error = xfs_reflink_end_cow(ip, offset, size);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Unwritten conversion updates the in-core isize after extent
|
|
* conversion but before updating the on-disk size. Updating isize any
|
|
* earlier allows a racing dio read to find unwritten extents before
|
|
* they are converted.
|
|
*/
|
|
if (flags & IOMAP_DIO_UNWRITTEN) {
|
|
error = xfs_iomap_write_unwritten(ip, offset, size, true);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* We need to update the in-core inode size here so that we don't end up
|
|
* with the on-disk inode size being outside the in-core inode size. We
|
|
* have no other method of updating EOF for AIO, so always do it here
|
|
* if necessary.
|
|
*
|
|
* We need to lock the test/set EOF update as we can be racing with
|
|
* other IO completions here to update the EOF. Failing to serialise
|
|
* here can result in EOF moving backwards and Bad Things Happen when
|
|
* that occurs.
|
|
*
|
|
* As IO completion only ever extends EOF, we can do an unlocked check
|
|
* here to avoid taking the spinlock. If we land within the current EOF,
|
|
* then we do not need to do an extending update at all, and we don't
|
|
* need to take the lock to check this. If we race with an update moving
|
|
* EOF, then we'll either still be beyond EOF and need to take the lock,
|
|
* or we'll be within EOF and we don't need to take it at all.
|
|
*/
|
|
if (offset + size <= i_size_read(inode))
|
|
goto out;
|
|
|
|
spin_lock(&ip->i_flags_lock);
|
|
if (offset + size > i_size_read(inode)) {
|
|
i_size_write(inode, offset + size);
|
|
spin_unlock(&ip->i_flags_lock);
|
|
error = xfs_setfilesize(ip, offset, size);
|
|
} else {
|
|
spin_unlock(&ip->i_flags_lock);
|
|
}
|
|
|
|
out:
|
|
memalloc_nofs_restore(nofs_flag);
|
|
return error;
|
|
}
|
|
|
|
static const struct iomap_dio_ops xfs_dio_write_ops = {
|
|
.end_io = xfs_dio_write_end_io,
|
|
};
|
|
|
|
/*
|
|
* Handle block aligned direct I/O writes
|
|
*/
|
|
static noinline ssize_t
|
|
xfs_file_dio_write_aligned(
|
|
struct xfs_inode *ip,
|
|
struct kiocb *iocb,
|
|
struct iov_iter *from)
|
|
{
|
|
int iolock = XFS_IOLOCK_SHARED;
|
|
ssize_t ret;
|
|
|
|
ret = xfs_ilock_iocb(iocb, iolock);
|
|
if (ret)
|
|
return ret;
|
|
ret = xfs_file_write_checks(iocb, from, &iolock);
|
|
if (ret)
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* We don't need to hold the IOLOCK exclusively across the IO, so demote
|
|
* the iolock back to shared if we had to take the exclusive lock in
|
|
* xfs_file_write_checks() for other reasons.
|
|
*/
|
|
if (iolock == XFS_IOLOCK_EXCL) {
|
|
xfs_ilock_demote(ip, XFS_IOLOCK_EXCL);
|
|
iolock = XFS_IOLOCK_SHARED;
|
|
}
|
|
trace_xfs_file_direct_write(iocb, from);
|
|
ret = iomap_dio_rw(iocb, from, &xfs_direct_write_iomap_ops,
|
|
&xfs_dio_write_ops, 0);
|
|
out_unlock:
|
|
if (iolock)
|
|
xfs_iunlock(ip, iolock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Handle block unaligned direct I/O writes
|
|
*
|
|
* In most cases direct I/O writes will be done holding IOLOCK_SHARED, allowing
|
|
* them to be done in parallel with reads and other direct I/O writes. However,
|
|
* if the I/O is not aligned to filesystem blocks, the direct I/O layer may need
|
|
* to do sub-block zeroing and that requires serialisation against other direct
|
|
* I/O to the same block. In this case we need to serialise the submission of
|
|
* the unaligned I/O so that we don't get racing block zeroing in the dio layer.
|
|
* In the case where sub-block zeroing is not required, we can do concurrent
|
|
* sub-block dios to the same block successfully.
|
|
*
|
|
* Optimistically submit the I/O using the shared lock first, but use the
|
|
* IOMAP_DIO_OVERWRITE_ONLY flag to tell the lower layers to return -EAGAIN
|
|
* if block allocation or partial block zeroing would be required. In that case
|
|
* we try again with the exclusive lock.
|
|
*/
|
|
static noinline ssize_t
|
|
xfs_file_dio_write_unaligned(
|
|
struct xfs_inode *ip,
|
|
struct kiocb *iocb,
|
|
struct iov_iter *from)
|
|
{
|
|
size_t isize = i_size_read(VFS_I(ip));
|
|
size_t count = iov_iter_count(from);
|
|
int iolock = XFS_IOLOCK_SHARED;
|
|
unsigned int flags = IOMAP_DIO_OVERWRITE_ONLY;
|
|
ssize_t ret;
|
|
|
|
/*
|
|
* Extending writes need exclusivity because of the sub-block zeroing
|
|
* that the DIO code always does for partial tail blocks beyond EOF, so
|
|
* don't even bother trying the fast path in this case.
|
|
*/
|
|
if (iocb->ki_pos > isize || iocb->ki_pos + count >= isize) {
|
|
retry_exclusive:
|
|
if (iocb->ki_flags & IOCB_NOWAIT)
|
|
return -EAGAIN;
|
|
iolock = XFS_IOLOCK_EXCL;
|
|
flags = IOMAP_DIO_FORCE_WAIT;
|
|
}
|
|
|
|
ret = xfs_ilock_iocb(iocb, iolock);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* We can't properly handle unaligned direct I/O to reflink files yet,
|
|
* as we can't unshare a partial block.
|
|
*/
|
|
if (xfs_is_cow_inode(ip)) {
|
|
trace_xfs_reflink_bounce_dio_write(iocb, from);
|
|
ret = -ENOTBLK;
|
|
goto out_unlock;
|
|
}
|
|
|
|
ret = xfs_file_write_checks(iocb, from, &iolock);
|
|
if (ret)
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* If we are doing exclusive unaligned I/O, this must be the only I/O
|
|
* in-flight. Otherwise we risk data corruption due to unwritten extent
|
|
* conversions from the AIO end_io handler. Wait for all other I/O to
|
|
* drain first.
|
|
*/
|
|
if (flags & IOMAP_DIO_FORCE_WAIT)
|
|
inode_dio_wait(VFS_I(ip));
|
|
|
|
trace_xfs_file_direct_write(iocb, from);
|
|
ret = iomap_dio_rw(iocb, from, &xfs_direct_write_iomap_ops,
|
|
&xfs_dio_write_ops, flags);
|
|
|
|
/*
|
|
* Retry unaligned I/O with exclusive blocking semantics if the DIO
|
|
* layer rejected it for mapping or locking reasons. If we are doing
|
|
* nonblocking user I/O, propagate the error.
|
|
*/
|
|
if (ret == -EAGAIN && !(iocb->ki_flags & IOCB_NOWAIT)) {
|
|
ASSERT(flags & IOMAP_DIO_OVERWRITE_ONLY);
|
|
xfs_iunlock(ip, iolock);
|
|
goto retry_exclusive;
|
|
}
|
|
|
|
out_unlock:
|
|
if (iolock)
|
|
xfs_iunlock(ip, iolock);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t
|
|
xfs_file_dio_write(
|
|
struct kiocb *iocb,
|
|
struct iov_iter *from)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp));
|
|
struct xfs_buftarg *target = xfs_inode_buftarg(ip);
|
|
size_t count = iov_iter_count(from);
|
|
|
|
/* direct I/O must be aligned to device logical sector size */
|
|
if ((iocb->ki_pos | count) & target->bt_logical_sectormask)
|
|
return -EINVAL;
|
|
if ((iocb->ki_pos | count) & ip->i_mount->m_blockmask)
|
|
return xfs_file_dio_write_unaligned(ip, iocb, from);
|
|
return xfs_file_dio_write_aligned(ip, iocb, from);
|
|
}
|
|
|
|
static noinline ssize_t
|
|
xfs_file_dax_write(
|
|
struct kiocb *iocb,
|
|
struct iov_iter *from)
|
|
{
|
|
struct inode *inode = iocb->ki_filp->f_mapping->host;
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
int iolock = XFS_IOLOCK_EXCL;
|
|
ssize_t ret, error = 0;
|
|
loff_t pos;
|
|
|
|
ret = xfs_ilock_iocb(iocb, iolock);
|
|
if (ret)
|
|
return ret;
|
|
ret = xfs_file_write_checks(iocb, from, &iolock);
|
|
if (ret)
|
|
goto out;
|
|
|
|
pos = iocb->ki_pos;
|
|
|
|
trace_xfs_file_dax_write(iocb, from);
|
|
ret = dax_iomap_rw(iocb, from, &xfs_direct_write_iomap_ops);
|
|
if (ret > 0 && iocb->ki_pos > i_size_read(inode)) {
|
|
i_size_write(inode, iocb->ki_pos);
|
|
error = xfs_setfilesize(ip, pos, ret);
|
|
}
|
|
out:
|
|
if (iolock)
|
|
xfs_iunlock(ip, iolock);
|
|
if (error)
|
|
return error;
|
|
|
|
if (ret > 0) {
|
|
XFS_STATS_ADD(ip->i_mount, xs_write_bytes, ret);
|
|
|
|
/* Handle various SYNC-type writes */
|
|
ret = generic_write_sync(iocb, ret);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
STATIC ssize_t
|
|
xfs_file_buffered_write(
|
|
struct kiocb *iocb,
|
|
struct iov_iter *from)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct address_space *mapping = file->f_mapping;
|
|
struct inode *inode = mapping->host;
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
ssize_t ret;
|
|
bool cleared_space = false;
|
|
int iolock;
|
|
|
|
if (iocb->ki_flags & IOCB_NOWAIT)
|
|
return -EOPNOTSUPP;
|
|
|
|
write_retry:
|
|
iolock = XFS_IOLOCK_EXCL;
|
|
xfs_ilock(ip, iolock);
|
|
|
|
ret = xfs_file_write_checks(iocb, from, &iolock);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* We can write back this queue in page reclaim */
|
|
current->backing_dev_info = inode_to_bdi(inode);
|
|
|
|
trace_xfs_file_buffered_write(iocb, from);
|
|
ret = iomap_file_buffered_write(iocb, from,
|
|
&xfs_buffered_write_iomap_ops);
|
|
if (likely(ret >= 0))
|
|
iocb->ki_pos += ret;
|
|
|
|
/*
|
|
* If we hit a space limit, try to free up some lingering preallocated
|
|
* space before returning an error. In the case of ENOSPC, first try to
|
|
* write back all dirty inodes to free up some of the excess reserved
|
|
* metadata space. This reduces the chances that the eofblocks scan
|
|
* waits on dirty mappings. Since xfs_flush_inodes() is serialized, this
|
|
* also behaves as a filter to prevent too many eofblocks scans from
|
|
* running at the same time. Use a synchronous scan to increase the
|
|
* effectiveness of the scan.
|
|
*/
|
|
if (ret == -EDQUOT && !cleared_space) {
|
|
xfs_iunlock(ip, iolock);
|
|
xfs_blockgc_free_quota(ip, XFS_ICWALK_FLAG_SYNC);
|
|
cleared_space = true;
|
|
goto write_retry;
|
|
} else if (ret == -ENOSPC && !cleared_space) {
|
|
struct xfs_icwalk icw = {0};
|
|
|
|
cleared_space = true;
|
|
xfs_flush_inodes(ip->i_mount);
|
|
|
|
xfs_iunlock(ip, iolock);
|
|
icw.icw_flags = XFS_ICWALK_FLAG_SYNC;
|
|
xfs_blockgc_free_space(ip->i_mount, &icw);
|
|
goto write_retry;
|
|
}
|
|
|
|
current->backing_dev_info = NULL;
|
|
out:
|
|
if (iolock)
|
|
xfs_iunlock(ip, iolock);
|
|
|
|
if (ret > 0) {
|
|
XFS_STATS_ADD(ip->i_mount, xs_write_bytes, ret);
|
|
/* Handle various SYNC-type writes */
|
|
ret = generic_write_sync(iocb, ret);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
STATIC ssize_t
|
|
xfs_file_write_iter(
|
|
struct kiocb *iocb,
|
|
struct iov_iter *from)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct address_space *mapping = file->f_mapping;
|
|
struct inode *inode = mapping->host;
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
ssize_t ret;
|
|
size_t ocount = iov_iter_count(from);
|
|
|
|
XFS_STATS_INC(ip->i_mount, xs_write_calls);
|
|
|
|
if (ocount == 0)
|
|
return 0;
|
|
|
|
if (xfs_is_shutdown(ip->i_mount))
|
|
return -EIO;
|
|
|
|
if (IS_DAX(inode))
|
|
return xfs_file_dax_write(iocb, from);
|
|
|
|
if (iocb->ki_flags & IOCB_DIRECT) {
|
|
/*
|
|
* Allow a directio write to fall back to a buffered
|
|
* write *only* in the case that we're doing a reflink
|
|
* CoW. In all other directio scenarios we do not
|
|
* allow an operation to fall back to buffered mode.
|
|
*/
|
|
ret = xfs_file_dio_write(iocb, from);
|
|
if (ret != -ENOTBLK)
|
|
return ret;
|
|
}
|
|
|
|
return xfs_file_buffered_write(iocb, from);
|
|
}
|
|
|
|
static void
|
|
xfs_wait_dax_page(
|
|
struct inode *inode)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
|
|
xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
|
|
schedule();
|
|
xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
|
|
}
|
|
|
|
static int
|
|
xfs_break_dax_layouts(
|
|
struct inode *inode,
|
|
bool *retry)
|
|
{
|
|
struct page *page;
|
|
|
|
ASSERT(xfs_isilocked(XFS_I(inode), XFS_MMAPLOCK_EXCL));
|
|
|
|
page = dax_layout_busy_page(inode->i_mapping);
|
|
if (!page)
|
|
return 0;
|
|
|
|
*retry = true;
|
|
return ___wait_var_event(&page->_refcount,
|
|
atomic_read(&page->_refcount) == 1, TASK_INTERRUPTIBLE,
|
|
0, 0, xfs_wait_dax_page(inode));
|
|
}
|
|
|
|
int
|
|
xfs_break_layouts(
|
|
struct inode *inode,
|
|
uint *iolock,
|
|
enum layout_break_reason reason)
|
|
{
|
|
bool retry;
|
|
int error;
|
|
|
|
ASSERT(xfs_isilocked(XFS_I(inode), XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL));
|
|
|
|
do {
|
|
retry = false;
|
|
switch (reason) {
|
|
case BREAK_UNMAP:
|
|
error = xfs_break_dax_layouts(inode, &retry);
|
|
if (error || retry)
|
|
break;
|
|
fallthrough;
|
|
case BREAK_WRITE:
|
|
error = xfs_break_leased_layouts(inode, iolock, &retry);
|
|
break;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
error = -EINVAL;
|
|
}
|
|
} while (error == 0 && retry);
|
|
|
|
return error;
|
|
}
|
|
|
|
#define XFS_FALLOC_FL_SUPPORTED \
|
|
(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \
|
|
FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE | \
|
|
FALLOC_FL_INSERT_RANGE | FALLOC_FL_UNSHARE_RANGE)
|
|
|
|
STATIC long
|
|
xfs_file_fallocate(
|
|
struct file *file,
|
|
int mode,
|
|
loff_t offset,
|
|
loff_t len)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
long error;
|
|
enum xfs_prealloc_flags flags = 0;
|
|
uint iolock = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
|
|
loff_t new_size = 0;
|
|
bool do_file_insert = false;
|
|
|
|
if (!S_ISREG(inode->i_mode))
|
|
return -EINVAL;
|
|
if (mode & ~XFS_FALLOC_FL_SUPPORTED)
|
|
return -EOPNOTSUPP;
|
|
|
|
xfs_ilock(ip, iolock);
|
|
error = xfs_break_layouts(inode, &iolock, BREAK_UNMAP);
|
|
if (error)
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* Must wait for all AIO to complete before we continue as AIO can
|
|
* change the file size on completion without holding any locks we
|
|
* currently hold. We must do this first because AIO can update both
|
|
* the on disk and in memory inode sizes, and the operations that follow
|
|
* require the in-memory size to be fully up-to-date.
|
|
*/
|
|
inode_dio_wait(inode);
|
|
|
|
/*
|
|
* Now AIO and DIO has drained we flush and (if necessary) invalidate
|
|
* the cached range over the first operation we are about to run.
|
|
*
|
|
* We care about zero and collapse here because they both run a hole
|
|
* punch over the range first. Because that can zero data, and the range
|
|
* of invalidation for the shift operations is much larger, we still do
|
|
* the required flush for collapse in xfs_prepare_shift().
|
|
*
|
|
* Insert has the same range requirements as collapse, and we extend the
|
|
* file first which can zero data. Hence insert has the same
|
|
* flush/invalidate requirements as collapse and so they are both
|
|
* handled at the right time by xfs_prepare_shift().
|
|
*/
|
|
if (mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_ZERO_RANGE |
|
|
FALLOC_FL_COLLAPSE_RANGE)) {
|
|
error = xfs_flush_unmap_range(ip, offset, len);
|
|
if (error)
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (mode & FALLOC_FL_PUNCH_HOLE) {
|
|
error = xfs_free_file_space(ip, offset, len);
|
|
if (error)
|
|
goto out_unlock;
|
|
} else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
|
|
if (!xfs_is_falloc_aligned(ip, offset, len)) {
|
|
error = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
/*
|
|
* There is no need to overlap collapse range with EOF,
|
|
* in which case it is effectively a truncate operation
|
|
*/
|
|
if (offset + len >= i_size_read(inode)) {
|
|
error = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
new_size = i_size_read(inode) - len;
|
|
|
|
error = xfs_collapse_file_space(ip, offset, len);
|
|
if (error)
|
|
goto out_unlock;
|
|
} else if (mode & FALLOC_FL_INSERT_RANGE) {
|
|
loff_t isize = i_size_read(inode);
|
|
|
|
if (!xfs_is_falloc_aligned(ip, offset, len)) {
|
|
error = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
/*
|
|
* New inode size must not exceed ->s_maxbytes, accounting for
|
|
* possible signed overflow.
|
|
*/
|
|
if (inode->i_sb->s_maxbytes - isize < len) {
|
|
error = -EFBIG;
|
|
goto out_unlock;
|
|
}
|
|
new_size = isize + len;
|
|
|
|
/* Offset should be less than i_size */
|
|
if (offset >= isize) {
|
|
error = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
do_file_insert = true;
|
|
} else {
|
|
flags |= XFS_PREALLOC_SET;
|
|
|
|
if (!(mode & FALLOC_FL_KEEP_SIZE) &&
|
|
offset + len > i_size_read(inode)) {
|
|
new_size = offset + len;
|
|
error = inode_newsize_ok(inode, new_size);
|
|
if (error)
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (mode & FALLOC_FL_ZERO_RANGE) {
|
|
/*
|
|
* Punch a hole and prealloc the range. We use a hole
|
|
* punch rather than unwritten extent conversion for two
|
|
* reasons:
|
|
*
|
|
* 1.) Hole punch handles partial block zeroing for us.
|
|
* 2.) If prealloc returns ENOSPC, the file range is
|
|
* still zero-valued by virtue of the hole punch.
|
|
*/
|
|
unsigned int blksize = i_blocksize(inode);
|
|
|
|
trace_xfs_zero_file_space(ip);
|
|
|
|
error = xfs_free_file_space(ip, offset, len);
|
|
if (error)
|
|
goto out_unlock;
|
|
|
|
len = round_up(offset + len, blksize) -
|
|
round_down(offset, blksize);
|
|
offset = round_down(offset, blksize);
|
|
} else if (mode & FALLOC_FL_UNSHARE_RANGE) {
|
|
error = xfs_reflink_unshare(ip, offset, len);
|
|
if (error)
|
|
goto out_unlock;
|
|
} else {
|
|
/*
|
|
* If always_cow mode we can't use preallocations and
|
|
* thus should not create them.
|
|
*/
|
|
if (xfs_is_always_cow_inode(ip)) {
|
|
error = -EOPNOTSUPP;
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
if (!xfs_is_always_cow_inode(ip)) {
|
|
error = xfs_alloc_file_space(ip, offset, len,
|
|
XFS_BMAPI_PREALLOC);
|
|
if (error)
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
if (file->f_flags & O_DSYNC)
|
|
flags |= XFS_PREALLOC_SYNC;
|
|
|
|
error = xfs_update_prealloc_flags(ip, flags);
|
|
if (error)
|
|
goto out_unlock;
|
|
|
|
/* Change file size if needed */
|
|
if (new_size) {
|
|
struct iattr iattr;
|
|
|
|
iattr.ia_valid = ATTR_SIZE;
|
|
iattr.ia_size = new_size;
|
|
error = xfs_vn_setattr_size(file_mnt_user_ns(file),
|
|
file_dentry(file), &iattr);
|
|
if (error)
|
|
goto out_unlock;
|
|
}
|
|
|
|
/*
|
|
* Perform hole insertion now that the file size has been
|
|
* updated so that if we crash during the operation we don't
|
|
* leave shifted extents past EOF and hence losing access to
|
|
* the data that is contained within them.
|
|
*/
|
|
if (do_file_insert)
|
|
error = xfs_insert_file_space(ip, offset, len);
|
|
|
|
out_unlock:
|
|
xfs_iunlock(ip, iolock);
|
|
return error;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_file_fadvise(
|
|
struct file *file,
|
|
loff_t start,
|
|
loff_t end,
|
|
int advice)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(file_inode(file));
|
|
int ret;
|
|
int lockflags = 0;
|
|
|
|
/*
|
|
* Operations creating pages in page cache need protection from hole
|
|
* punching and similar ops
|
|
*/
|
|
if (advice == POSIX_FADV_WILLNEED) {
|
|
lockflags = XFS_IOLOCK_SHARED;
|
|
xfs_ilock(ip, lockflags);
|
|
}
|
|
ret = generic_fadvise(file, start, end, advice);
|
|
if (lockflags)
|
|
xfs_iunlock(ip, lockflags);
|
|
return ret;
|
|
}
|
|
|
|
/* Does this file, inode, or mount want synchronous writes? */
|
|
static inline bool xfs_file_sync_writes(struct file *filp)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(file_inode(filp));
|
|
|
|
if (xfs_has_wsync(ip->i_mount))
|
|
return true;
|
|
if (filp->f_flags & (__O_SYNC | O_DSYNC))
|
|
return true;
|
|
if (IS_SYNC(file_inode(filp)))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
STATIC loff_t
|
|
xfs_file_remap_range(
|
|
struct file *file_in,
|
|
loff_t pos_in,
|
|
struct file *file_out,
|
|
loff_t pos_out,
|
|
loff_t len,
|
|
unsigned int remap_flags)
|
|
{
|
|
struct inode *inode_in = file_inode(file_in);
|
|
struct xfs_inode *src = XFS_I(inode_in);
|
|
struct inode *inode_out = file_inode(file_out);
|
|
struct xfs_inode *dest = XFS_I(inode_out);
|
|
struct xfs_mount *mp = src->i_mount;
|
|
loff_t remapped = 0;
|
|
xfs_extlen_t cowextsize;
|
|
int ret;
|
|
|
|
if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY))
|
|
return -EINVAL;
|
|
|
|
if (!xfs_has_reflink(mp))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (xfs_is_shutdown(mp))
|
|
return -EIO;
|
|
|
|
/* Prepare and then clone file data. */
|
|
ret = xfs_reflink_remap_prep(file_in, pos_in, file_out, pos_out,
|
|
&len, remap_flags);
|
|
if (ret || len == 0)
|
|
return ret;
|
|
|
|
trace_xfs_reflink_remap_range(src, pos_in, len, dest, pos_out);
|
|
|
|
ret = xfs_reflink_remap_blocks(src, pos_in, dest, pos_out, len,
|
|
&remapped);
|
|
if (ret)
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* Carry the cowextsize hint from src to dest if we're sharing the
|
|
* entire source file to the entire destination file, the source file
|
|
* has a cowextsize hint, and the destination file does not.
|
|
*/
|
|
cowextsize = 0;
|
|
if (pos_in == 0 && len == i_size_read(inode_in) &&
|
|
(src->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE) &&
|
|
pos_out == 0 && len >= i_size_read(inode_out) &&
|
|
!(dest->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE))
|
|
cowextsize = src->i_cowextsize;
|
|
|
|
ret = xfs_reflink_update_dest(dest, pos_out + len, cowextsize,
|
|
remap_flags);
|
|
if (ret)
|
|
goto out_unlock;
|
|
|
|
if (xfs_file_sync_writes(file_in) || xfs_file_sync_writes(file_out))
|
|
xfs_log_force_inode(dest);
|
|
out_unlock:
|
|
xfs_iunlock2_io_mmap(src, dest);
|
|
if (ret)
|
|
trace_xfs_reflink_remap_range_error(dest, ret, _RET_IP_);
|
|
return remapped > 0 ? remapped : ret;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_file_open(
|
|
struct inode *inode,
|
|
struct file *file)
|
|
{
|
|
if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
|
|
return -EFBIG;
|
|
if (xfs_is_shutdown(XFS_M(inode->i_sb)))
|
|
return -EIO;
|
|
file->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC;
|
|
return 0;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_dir_open(
|
|
struct inode *inode,
|
|
struct file *file)
|
|
{
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
int mode;
|
|
int error;
|
|
|
|
error = xfs_file_open(inode, file);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* If there are any blocks, read-ahead block 0 as we're almost
|
|
* certain to have the next operation be a read there.
|
|
*/
|
|
mode = xfs_ilock_data_map_shared(ip);
|
|
if (ip->i_df.if_nextents > 0)
|
|
error = xfs_dir3_data_readahead(ip, 0, 0);
|
|
xfs_iunlock(ip, mode);
|
|
return error;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_file_release(
|
|
struct inode *inode,
|
|
struct file *filp)
|
|
{
|
|
return xfs_release(XFS_I(inode));
|
|
}
|
|
|
|
STATIC int
|
|
xfs_file_readdir(
|
|
struct file *file,
|
|
struct dir_context *ctx)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
xfs_inode_t *ip = XFS_I(inode);
|
|
size_t bufsize;
|
|
|
|
/*
|
|
* The Linux API doesn't pass down the total size of the buffer
|
|
* we read into down to the filesystem. With the filldir concept
|
|
* it's not needed for correct information, but the XFS dir2 leaf
|
|
* code wants an estimate of the buffer size to calculate it's
|
|
* readahead window and size the buffers used for mapping to
|
|
* physical blocks.
|
|
*
|
|
* Try to give it an estimate that's good enough, maybe at some
|
|
* point we can change the ->readdir prototype to include the
|
|
* buffer size. For now we use the current glibc buffer size.
|
|
*/
|
|
bufsize = (size_t)min_t(loff_t, XFS_READDIR_BUFSIZE, ip->i_disk_size);
|
|
|
|
return xfs_readdir(NULL, ip, ctx, bufsize);
|
|
}
|
|
|
|
STATIC loff_t
|
|
xfs_file_llseek(
|
|
struct file *file,
|
|
loff_t offset,
|
|
int whence)
|
|
{
|
|
struct inode *inode = file->f_mapping->host;
|
|
|
|
if (xfs_is_shutdown(XFS_I(inode)->i_mount))
|
|
return -EIO;
|
|
|
|
switch (whence) {
|
|
default:
|
|
return generic_file_llseek(file, offset, whence);
|
|
case SEEK_HOLE:
|
|
offset = iomap_seek_hole(inode, offset, &xfs_seek_iomap_ops);
|
|
break;
|
|
case SEEK_DATA:
|
|
offset = iomap_seek_data(inode, offset, &xfs_seek_iomap_ops);
|
|
break;
|
|
}
|
|
|
|
if (offset < 0)
|
|
return offset;
|
|
return vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
|
|
}
|
|
|
|
/*
|
|
* Locking for serialisation of IO during page faults. This results in a lock
|
|
* ordering of:
|
|
*
|
|
* mmap_lock (MM)
|
|
* sb_start_pagefault(vfs, freeze)
|
|
* invalidate_lock (vfs/XFS_MMAPLOCK - truncate serialisation)
|
|
* page_lock (MM)
|
|
* i_lock (XFS - extent map serialisation)
|
|
*/
|
|
static vm_fault_t
|
|
__xfs_filemap_fault(
|
|
struct vm_fault *vmf,
|
|
enum page_entry_size pe_size,
|
|
bool write_fault)
|
|
{
|
|
struct inode *inode = file_inode(vmf->vma->vm_file);
|
|
struct xfs_inode *ip = XFS_I(inode);
|
|
vm_fault_t ret;
|
|
|
|
trace_xfs_filemap_fault(ip, pe_size, write_fault);
|
|
|
|
if (write_fault) {
|
|
sb_start_pagefault(inode->i_sb);
|
|
file_update_time(vmf->vma->vm_file);
|
|
}
|
|
|
|
if (IS_DAX(inode)) {
|
|
pfn_t pfn;
|
|
|
|
xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
|
|
ret = dax_iomap_fault(vmf, pe_size, &pfn, NULL,
|
|
(write_fault && !vmf->cow_page) ?
|
|
&xfs_direct_write_iomap_ops :
|
|
&xfs_read_iomap_ops);
|
|
if (ret & VM_FAULT_NEEDDSYNC)
|
|
ret = dax_finish_sync_fault(vmf, pe_size, pfn);
|
|
xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
|
|
} else {
|
|
if (write_fault) {
|
|
xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
|
|
ret = iomap_page_mkwrite(vmf,
|
|
&xfs_buffered_write_iomap_ops);
|
|
xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
|
|
} else {
|
|
ret = filemap_fault(vmf);
|
|
}
|
|
}
|
|
|
|
if (write_fault)
|
|
sb_end_pagefault(inode->i_sb);
|
|
return ret;
|
|
}
|
|
|
|
static inline bool
|
|
xfs_is_write_fault(
|
|
struct vm_fault *vmf)
|
|
{
|
|
return (vmf->flags & FAULT_FLAG_WRITE) &&
|
|
(vmf->vma->vm_flags & VM_SHARED);
|
|
}
|
|
|
|
static vm_fault_t
|
|
xfs_filemap_fault(
|
|
struct vm_fault *vmf)
|
|
{
|
|
/* DAX can shortcut the normal fault path on write faults! */
|
|
return __xfs_filemap_fault(vmf, PE_SIZE_PTE,
|
|
IS_DAX(file_inode(vmf->vma->vm_file)) &&
|
|
xfs_is_write_fault(vmf));
|
|
}
|
|
|
|
static vm_fault_t
|
|
xfs_filemap_huge_fault(
|
|
struct vm_fault *vmf,
|
|
enum page_entry_size pe_size)
|
|
{
|
|
if (!IS_DAX(file_inode(vmf->vma->vm_file)))
|
|
return VM_FAULT_FALLBACK;
|
|
|
|
/* DAX can shortcut the normal fault path on write faults! */
|
|
return __xfs_filemap_fault(vmf, pe_size,
|
|
xfs_is_write_fault(vmf));
|
|
}
|
|
|
|
static vm_fault_t
|
|
xfs_filemap_page_mkwrite(
|
|
struct vm_fault *vmf)
|
|
{
|
|
return __xfs_filemap_fault(vmf, PE_SIZE_PTE, true);
|
|
}
|
|
|
|
/*
|
|
* pfn_mkwrite was originally intended to ensure we capture time stamp updates
|
|
* on write faults. In reality, it needs to serialise against truncate and
|
|
* prepare memory for writing so handle is as standard write fault.
|
|
*/
|
|
static vm_fault_t
|
|
xfs_filemap_pfn_mkwrite(
|
|
struct vm_fault *vmf)
|
|
{
|
|
|
|
return __xfs_filemap_fault(vmf, PE_SIZE_PTE, true);
|
|
}
|
|
|
|
static vm_fault_t
|
|
xfs_filemap_map_pages(
|
|
struct vm_fault *vmf,
|
|
pgoff_t start_pgoff,
|
|
pgoff_t end_pgoff)
|
|
{
|
|
struct inode *inode = file_inode(vmf->vma->vm_file);
|
|
vm_fault_t ret;
|
|
|
|
xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
|
|
ret = filemap_map_pages(vmf, start_pgoff, end_pgoff);
|
|
xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
|
|
return ret;
|
|
}
|
|
|
|
static const struct vm_operations_struct xfs_file_vm_ops = {
|
|
.fault = xfs_filemap_fault,
|
|
.huge_fault = xfs_filemap_huge_fault,
|
|
.map_pages = xfs_filemap_map_pages,
|
|
.page_mkwrite = xfs_filemap_page_mkwrite,
|
|
.pfn_mkwrite = xfs_filemap_pfn_mkwrite,
|
|
};
|
|
|
|
STATIC int
|
|
xfs_file_mmap(
|
|
struct file *file,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct xfs_buftarg *target = xfs_inode_buftarg(XFS_I(inode));
|
|
|
|
/*
|
|
* We don't support synchronous mappings for non-DAX files and
|
|
* for DAX files if underneath dax_device is not synchronous.
|
|
*/
|
|
if (!daxdev_mapping_supported(vma, target->bt_daxdev))
|
|
return -EOPNOTSUPP;
|
|
|
|
file_accessed(file);
|
|
vma->vm_ops = &xfs_file_vm_ops;
|
|
if (IS_DAX(inode))
|
|
vma->vm_flags |= VM_HUGEPAGE;
|
|
return 0;
|
|
}
|
|
|
|
const struct file_operations xfs_file_operations = {
|
|
.llseek = xfs_file_llseek,
|
|
.read_iter = xfs_file_read_iter,
|
|
.write_iter = xfs_file_write_iter,
|
|
.splice_read = generic_file_splice_read,
|
|
.splice_write = iter_file_splice_write,
|
|
.iopoll = iomap_dio_iopoll,
|
|
.unlocked_ioctl = xfs_file_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = xfs_file_compat_ioctl,
|
|
#endif
|
|
.mmap = xfs_file_mmap,
|
|
.mmap_supported_flags = MAP_SYNC,
|
|
.open = xfs_file_open,
|
|
.release = xfs_file_release,
|
|
.fsync = xfs_file_fsync,
|
|
.get_unmapped_area = thp_get_unmapped_area,
|
|
.fallocate = xfs_file_fallocate,
|
|
.fadvise = xfs_file_fadvise,
|
|
.remap_file_range = xfs_file_remap_range,
|
|
};
|
|
|
|
const struct file_operations xfs_dir_file_operations = {
|
|
.open = xfs_dir_open,
|
|
.read = generic_read_dir,
|
|
.iterate_shared = xfs_file_readdir,
|
|
.llseek = generic_file_llseek,
|
|
.unlocked_ioctl = xfs_file_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = xfs_file_compat_ioctl,
|
|
#endif
|
|
.fsync = xfs_dir_fsync,
|
|
};
|