From 6778948f9de86c3cfaf36725a7c87dcff9ba247f Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 08:20:59 +0000
Subject: [PATCH] kernel_5.10 no rt
---
kernel/fs/xfs/xfs_iomap.c | 1294 ++++++++++++++++++++++++++++++----------------------------
1 files changed, 675 insertions(+), 619 deletions(-)
diff --git a/kernel/fs/xfs/xfs_iomap.c b/kernel/fs/xfs/xfs_iomap.c
index 6320aca..bd5a25f 100644
--- a/kernel/fs/xfs/xfs_iomap.c
+++ b/kernel/fs/xfs/xfs_iomap.c
@@ -4,7 +4,6 @@
* Copyright (c) 2016-2018 Christoph Hellwig.
* All Rights Reserved.
*/
-#include <linux/iomap.h>
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
@@ -12,7 +11,6 @@
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
-#include "xfs_defer.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_bmap_btree.h"
@@ -25,28 +23,50 @@
#include "xfs_inode_item.h"
#include "xfs_iomap.h"
#include "xfs_trace.h"
-#include "xfs_icache.h"
#include "xfs_quota.h"
#include "xfs_dquot_item.h"
#include "xfs_dquot.h"
#include "xfs_reflink.h"
-#define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \
- << mp->m_writeio_log)
+#define XFS_ALLOC_ALIGN(mp, off) \
+ (((off) >> mp->m_allocsize_log) << mp->m_allocsize_log)
-void
+static int
+xfs_alert_fsblock_zero(
+ xfs_inode_t *ip,
+ xfs_bmbt_irec_t *imap)
+{
+ xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO,
+ "Access to block zero in inode %llu "
+ "start_block: %llx start_off: %llx "
+ "blkcnt: %llx extent-state: %x",
+ (unsigned long long)ip->i_ino,
+ (unsigned long long)imap->br_startblock,
+ (unsigned long long)imap->br_startoff,
+ (unsigned long long)imap->br_blockcount,
+ imap->br_state);
+ return -EFSCORRUPTED;
+}
+
+int
xfs_bmbt_to_iomap(
struct xfs_inode *ip,
struct iomap *iomap,
- struct xfs_bmbt_irec *imap)
+ struct xfs_bmbt_irec *imap,
+ u16 flags)
{
struct xfs_mount *mp = ip->i_mount;
+ struct xfs_buftarg *target = xfs_inode_buftarg(ip);
+
+ if (unlikely(!xfs_valid_startblock(ip, imap->br_startblock)))
+ return xfs_alert_fsblock_zero(ip, imap);
if (imap->br_startblock == HOLESTARTBLOCK) {
iomap->addr = IOMAP_NULL_ADDR;
iomap->type = IOMAP_HOLE;
- } else if (imap->br_startblock == DELAYSTARTBLOCK) {
+ } else if (imap->br_startblock == DELAYSTARTBLOCK ||
+ isnullstartblock(imap->br_startblock)) {
iomap->addr = IOMAP_NULL_ADDR;
iomap->type = IOMAP_DELALLOC;
} else {
@@ -58,14 +78,47 @@
}
iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff);
iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
- iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip));
- iomap->dax_dev = xfs_find_daxdev_for_inode(VFS_I(ip));
+ iomap->bdev = target->bt_bdev;
+ iomap->dax_dev = target->bt_daxdev;
+ iomap->flags = flags;
+
+ if (xfs_ipincount(ip) &&
+ (ip->i_itemp->ili_fsync_fields & ~XFS_ILOG_TIMESTAMP))
+ iomap->flags |= IOMAP_F_DIRTY;
+ return 0;
}
-xfs_extlen_t
-xfs_eof_alignment(
+static void
+xfs_hole_to_iomap(
struct xfs_inode *ip,
- xfs_extlen_t extsize)
+ struct iomap *iomap,
+ xfs_fileoff_t offset_fsb,
+ xfs_fileoff_t end_fsb)
+{
+ struct xfs_buftarg *target = xfs_inode_buftarg(ip);
+
+ iomap->addr = IOMAP_NULL_ADDR;
+ iomap->type = IOMAP_HOLE;
+ iomap->offset = XFS_FSB_TO_B(ip->i_mount, offset_fsb);
+ iomap->length = XFS_FSB_TO_B(ip->i_mount, end_fsb - offset_fsb);
+ iomap->bdev = target->bt_bdev;
+ iomap->dax_dev = target->bt_daxdev;
+}
+
+static inline xfs_fileoff_t
+xfs_iomap_end_fsb(
+ struct xfs_mount *mp,
+ loff_t offset,
+ loff_t count)
+{
+ ASSERT(offset <= mp->m_super->s_maxbytes);
+ return min(XFS_B_TO_FSB(mp, offset + count),
+ XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes));
+}
+
+static xfs_extlen_t
+xfs_eof_alignment(
+ struct xfs_inode *ip)
{
struct xfs_mount *mp = ip->i_mount;
xfs_extlen_t align = 0;
@@ -88,128 +141,80 @@
align = 0;
}
- /*
- * Always round up the allocation request to an extent boundary
- * (when file on a real-time subvolume or has di_extsize hint).
- */
- if (extsize) {
- if (align)
- align = roundup_64(align, extsize);
- else
- align = extsize;
- }
-
return align;
}
-STATIC int
+/*
+ * Check if last_fsb is outside the last extent, and if so grow it to the next
+ * stripe unit boundary.
+ */
+xfs_fileoff_t
xfs_iomap_eof_align_last_fsb(
struct xfs_inode *ip,
- xfs_extlen_t extsize,
- xfs_fileoff_t *last_fsb)
+ xfs_fileoff_t end_fsb)
{
- xfs_extlen_t align = xfs_eof_alignment(ip, extsize);
+ struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
+ xfs_extlen_t extsz = xfs_get_extsz_hint(ip);
+ xfs_extlen_t align = xfs_eof_alignment(ip);
+ struct xfs_bmbt_irec irec;
+ struct xfs_iext_cursor icur;
+
+ ASSERT(ifp->if_flags & XFS_IFEXTENTS);
+
+ /*
+ * Always round up the allocation request to the extent hint boundary.
+ */
+ if (extsz) {
+ if (align)
+ align = roundup_64(align, extsz);
+ else
+ align = extsz;
+ }
if (align) {
- xfs_fileoff_t new_last_fsb = roundup_64(*last_fsb, align);
- int eof, error;
+ xfs_fileoff_t aligned_end_fsb = roundup_64(end_fsb, align);
- error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
- if (error)
- return error;
- if (eof)
- *last_fsb = new_last_fsb;
+ xfs_iext_last(ifp, &icur);
+ if (!xfs_iext_get_extent(ifp, &icur, &irec) ||
+ aligned_end_fsb >= irec.br_startoff + irec.br_blockcount)
+ return aligned_end_fsb;
}
- return 0;
-}
-STATIC int
-xfs_alert_fsblock_zero(
- xfs_inode_t *ip,
- xfs_bmbt_irec_t *imap)
-{
- xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO,
- "Access to block zero in inode %llu "
- "start_block: %llx start_off: %llx "
- "blkcnt: %llx extent-state: %x",
- (unsigned long long)ip->i_ino,
- (unsigned long long)imap->br_startblock,
- (unsigned long long)imap->br_startoff,
- (unsigned long long)imap->br_blockcount,
- imap->br_state);
- return -EFSCORRUPTED;
+ return end_fsb;
}
int
xfs_iomap_write_direct(
- xfs_inode_t *ip,
- xfs_off_t offset,
- size_t count,
- xfs_bmbt_irec_t *imap,
- int nmaps)
+ struct xfs_inode *ip,
+ xfs_fileoff_t offset_fsb,
+ xfs_fileoff_t count_fsb,
+ struct xfs_bmbt_irec *imap)
{
- xfs_mount_t *mp = ip->i_mount;
- xfs_fileoff_t offset_fsb;
- xfs_fileoff_t last_fsb;
- xfs_filblks_t count_fsb, resaligned;
- xfs_extlen_t extsz;
- int nimaps;
- int quota_flag;
- int rt;
- xfs_trans_t *tp;
- uint qblocks, resblks, resrtextents;
- int error;
- int lockmode;
- int bmapi_flags = XFS_BMAPI_PREALLOC;
- uint tflags = 0;
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_trans *tp;
+ xfs_filblks_t resaligned;
+ int nimaps;
+ int quota_flag;
+ uint qblocks, resblks;
+ unsigned int resrtextents = 0;
+ int error;
+ int bmapi_flags = XFS_BMAPI_PREALLOC;
+ uint tflags = 0;
- rt = XFS_IS_REALTIME_INODE(ip);
- extsz = xfs_get_extsz_hint(ip);
- lockmode = XFS_ILOCK_SHARED; /* locked by caller */
-
- ASSERT(xfs_isilocked(ip, lockmode));
-
- offset_fsb = XFS_B_TO_FSBT(mp, offset);
- last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
- if ((offset + count) > XFS_ISIZE(ip)) {
- /*
- * Assert that the in-core extent list is present since this can
- * call xfs_iread_extents() and we only have the ilock shared.
- * This should be safe because the lock was held around a bmapi
- * call in the caller and we only need it to access the in-core
- * list.
- */
- ASSERT(XFS_IFORK_PTR(ip, XFS_DATA_FORK)->if_flags &
- XFS_IFEXTENTS);
- error = xfs_iomap_eof_align_last_fsb(ip, extsz, &last_fsb);
- if (error)
- goto out_unlock;
- } else {
- if (nmaps && (imap->br_startblock == HOLESTARTBLOCK))
- last_fsb = min(last_fsb, (xfs_fileoff_t)
- imap->br_blockcount +
- imap->br_startoff);
- }
- count_fsb = last_fsb - offset_fsb;
ASSERT(count_fsb > 0);
- resaligned = xfs_aligned_fsb_count(offset_fsb, count_fsb, extsz);
- if (unlikely(rt)) {
+ resaligned = xfs_aligned_fsb_count(offset_fsb, count_fsb,
+ xfs_get_extsz_hint(ip));
+ if (unlikely(XFS_IS_REALTIME_INODE(ip))) {
resrtextents = qblocks = resaligned;
resrtextents /= mp->m_sb.sb_rextsize;
resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
quota_flag = XFS_QMOPT_RES_RTBLKS;
} else {
- resrtextents = 0;
resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
quota_flag = XFS_QMOPT_RES_REGBLKS;
}
- /*
- * Drop the shared lock acquired by the caller, attach the dquot if
- * necessary and move on to transaction setup.
- */
- xfs_iunlock(ip, lockmode);
error = xfs_qm_dqattach(ip);
if (error)
return error;
@@ -239,8 +244,7 @@
if (error)
return error;
- lockmode = XFS_ILOCK_EXCL;
- xfs_ilock(ip, lockmode);
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, 0, quota_flag);
if (error)
@@ -253,8 +257,8 @@
* caller gave to us.
*/
nimaps = 1;
- error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
- bmapi_flags, resblks, imap, &nimaps);
+ error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, bmapi_flags, 0,
+ imap, &nimaps);
if (error)
goto out_res_cancel;
@@ -273,11 +277,11 @@
goto out_unlock;
}
- if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip)))
+ if (unlikely(!xfs_valid_startblock(ip, imap->br_startblock)))
error = xfs_alert_fsblock_zero(ip, imap);
out_unlock:
- xfs_iunlock(ip, lockmode);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
out_res_cancel:
@@ -289,11 +293,11 @@
STATIC bool
xfs_quota_need_throttle(
- struct xfs_inode *ip,
- int type,
- xfs_fsblock_t alloc_blocks)
+ struct xfs_inode *ip,
+ xfs_dqtype_t type,
+ xfs_fsblock_t alloc_blocks)
{
- struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
+ struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
if (!dq || !xfs_this_quota_on(ip->i_mount, type))
return false;
@@ -303,7 +307,7 @@
return false;
/* under the lo watermark, no throttle */
- if (dq->q_res_bcount + alloc_blocks < dq->q_prealloc_lo_wmark)
+ if (dq->q_blk.reserved + alloc_blocks < dq->q_prealloc_lo_wmark)
return false;
return true;
@@ -311,24 +315,24 @@
STATIC void
xfs_quota_calc_throttle(
- struct xfs_inode *ip,
- int type,
- xfs_fsblock_t *qblocks,
- int *qshift,
- int64_t *qfreesp)
+ struct xfs_inode *ip,
+ xfs_dqtype_t type,
+ xfs_fsblock_t *qblocks,
+ int *qshift,
+ int64_t *qfreesp)
{
- int64_t freesp;
- int shift = 0;
- struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
+ struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
+ int64_t freesp;
+ int shift = 0;
/* no dq, or over hi wmark, squash the prealloc completely */
- if (!dq || dq->q_res_bcount >= dq->q_prealloc_hi_wmark) {
+ if (!dq || dq->q_blk.reserved >= dq->q_prealloc_hi_wmark) {
*qblocks = 0;
*qfreesp = 0;
return;
}
- freesp = dq->q_prealloc_hi_wmark - dq->q_res_bcount;
+ freesp = dq->q_prealloc_hi_wmark - dq->q_blk.reserved;
if (freesp < dq->q_low_space[XFS_QLOWSP_5_PCNT]) {
shift = 2;
if (freesp < dq->q_low_space[XFS_QLOWSP_3_PCNT])
@@ -348,87 +352,83 @@
}
/*
- * If we are doing a write at the end of the file and there are no allocations
- * past this one, then extend the allocation out to the file system's write
- * iosize.
- *
* If we don't have a user specified preallocation size, dynamically increase
* the preallocation size as the size of the file grows. Cap the maximum size
* at a single extent or less if the filesystem is near full. The closer the
- * filesystem is to full, the smaller the maximum prealocation.
- *
- * As an exception we don't do any preallocation at all if the file is smaller
- * than the minimum preallocation and we are using the default dynamic
- * preallocation scheme, as it is likely this is the only write to the file that
- * is going to be done.
- *
- * We clean up any extra space left over when the file is closed in
- * xfs_inactive().
+ * filesystem is to being full, the smaller the maximum preallocation.
*/
STATIC xfs_fsblock_t
xfs_iomap_prealloc_size(
struct xfs_inode *ip,
+ int whichfork,
loff_t offset,
loff_t count,
struct xfs_iext_cursor *icur)
{
+ struct xfs_iext_cursor ncur = *icur;
+ struct xfs_bmbt_irec prev, got;
struct xfs_mount *mp = ip->i_mount;
- struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
+ struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
- struct xfs_bmbt_irec prev;
- int shift = 0;
int64_t freesp;
xfs_fsblock_t qblocks;
- int qshift = 0;
xfs_fsblock_t alloc_blocks = 0;
+ xfs_extlen_t plen;
+ int shift = 0;
+ int qshift = 0;
- if (offset + count <= XFS_ISIZE(ip))
- return 0;
-
- if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) &&
- (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_writeio_blocks)))
+ /*
+ * As an exception we don't do any preallocation at all if the file is
+ * smaller than the minimum preallocation and we are using the default
+ * dynamic preallocation scheme, as it is likely this is the only write
+ * to the file that is going to be done.
+ */
+ if (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_allocsize_blocks))
return 0;
/*
- * If an explicit allocsize is set, the file is small, or we
- * are writing behind a hole, then use the minimum prealloc:
+ * Use the minimum preallocation size for small files or if we are
+ * writing right after a hole.
*/
- if ((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ||
- XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_dalign) ||
- !xfs_iext_peek_prev_extent(ifp, icur, &prev) ||
+ if (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_dalign) ||
+ !xfs_iext_prev_extent(ifp, &ncur, &prev) ||
prev.br_startoff + prev.br_blockcount < offset_fsb)
- return mp->m_writeio_blocks;
+ return mp->m_allocsize_blocks;
/*
- * Determine the initial size of the preallocation. We are beyond the
- * current EOF here, but we need to take into account whether this is
- * a sparse write or an extending write when determining the
- * preallocation size. Hence we need to look up the extent that ends
- * at the current write offset and use the result to determine the
- * preallocation size.
- *
- * If the extent is a hole, then preallocation is essentially disabled.
- * Otherwise we take the size of the preceding data extent as the basis
- * for the preallocation size. If the size of the extent is greater than
- * half the maximum extent length, then use the current offset as the
- * basis. This ensures that for large files the preallocation size
- * always extends to MAXEXTLEN rather than falling short due to things
- * like stripe unit/width alignment of real extents.
+ * Take the size of the preceding data extents as the basis for the
+ * preallocation size. Note that we don't care if the previous extents
+ * are written or not.
*/
- if (prev.br_blockcount <= (MAXEXTLEN >> 1))
- alloc_blocks = prev.br_blockcount << 1;
- else
+ plen = prev.br_blockcount;
+ while (xfs_iext_prev_extent(ifp, &ncur, &got)) {
+ if (plen > MAXEXTLEN / 2 ||
+ isnullstartblock(got.br_startblock) ||
+ got.br_startoff + got.br_blockcount != prev.br_startoff ||
+ got.br_startblock + got.br_blockcount != prev.br_startblock)
+ break;
+ plen += got.br_blockcount;
+ prev = got;
+ }
+
+ /*
+ * If the size of the extents is greater than half the maximum extent
+ * length, then use the current offset as the basis. This ensures that
+ * for large files the preallocation size always extends to MAXEXTLEN
+ * rather than falling short due to things like stripe unit/width
+ * alignment of real extents.
+ */
+ alloc_blocks = plen * 2;
+ if (alloc_blocks > MAXEXTLEN)
alloc_blocks = XFS_B_TO_FSB(mp, offset);
- if (!alloc_blocks)
- goto check_writeio;
qblocks = alloc_blocks;
/*
* MAXEXTLEN is not a power of two value but we round the prealloc down
* to the nearest power of two value after throttling. To prevent the
- * round down from unconditionally reducing the maximum supported prealloc
- * size, we round up first, apply appropriate throttling, round down and
- * cap the value to MAXEXTLEN.
+ * round down from unconditionally reducing the maximum supported
+ * prealloc size, we round up first, apply appropriate throttling,
+ * round down and cap the value to MAXEXTLEN.
*/
alloc_blocks = XFS_FILEOFF_MIN(roundup_pow_of_two(MAXEXTLEN),
alloc_blocks);
@@ -450,14 +450,14 @@
* Check each quota to cap the prealloc size, provide a shift value to
* throttle with and adjust amount of available space.
*/
- if (xfs_quota_need_throttle(ip, XFS_DQ_USER, alloc_blocks))
- xfs_quota_calc_throttle(ip, XFS_DQ_USER, &qblocks, &qshift,
+ if (xfs_quota_need_throttle(ip, XFS_DQTYPE_USER, alloc_blocks))
+ xfs_quota_calc_throttle(ip, XFS_DQTYPE_USER, &qblocks, &qshift,
&freesp);
- if (xfs_quota_need_throttle(ip, XFS_DQ_GROUP, alloc_blocks))
- xfs_quota_calc_throttle(ip, XFS_DQ_GROUP, &qblocks, &qshift,
+ if (xfs_quota_need_throttle(ip, XFS_DQTYPE_GROUP, alloc_blocks))
+ xfs_quota_calc_throttle(ip, XFS_DQTYPE_GROUP, &qblocks, &qshift,
&freesp);
- if (xfs_quota_need_throttle(ip, XFS_DQ_PROJ, alloc_blocks))
- xfs_quota_calc_throttle(ip, XFS_DQ_PROJ, &qblocks, &qshift,
+ if (xfs_quota_need_throttle(ip, XFS_DQTYPE_PROJ, alloc_blocks))
+ xfs_quota_calc_throttle(ip, XFS_DQTYPE_PROJ, &qblocks, &qshift,
&freesp);
/*
@@ -489,317 +489,11 @@
*/
while (alloc_blocks && alloc_blocks >= freesp)
alloc_blocks >>= 4;
-check_writeio:
- if (alloc_blocks < mp->m_writeio_blocks)
- alloc_blocks = mp->m_writeio_blocks;
+ if (alloc_blocks < mp->m_allocsize_blocks)
+ alloc_blocks = mp->m_allocsize_blocks;
trace_xfs_iomap_prealloc_size(ip, alloc_blocks, shift,
- mp->m_writeio_blocks);
+ mp->m_allocsize_blocks);
return alloc_blocks;
-}
-
-static int
-xfs_file_iomap_begin_delay(
- struct inode *inode,
- loff_t offset,
- loff_t count,
- struct iomap *iomap)
-{
- struct xfs_inode *ip = XFS_I(inode);
- struct xfs_mount *mp = ip->i_mount;
- struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
- xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
- xfs_fileoff_t maxbytes_fsb =
- XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
- xfs_fileoff_t end_fsb;
- int error = 0, eof = 0;
- struct xfs_bmbt_irec got;
- struct xfs_iext_cursor icur;
- xfs_fsblock_t prealloc_blocks = 0;
-
- ASSERT(!XFS_IS_REALTIME_INODE(ip));
- ASSERT(!xfs_get_extsz_hint(ip));
-
- xfs_ilock(ip, XFS_ILOCK_EXCL);
-
- if (unlikely(XFS_TEST_ERROR(
- (XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_EXTENTS &&
- XFS_IFORK_FORMAT(ip, XFS_DATA_FORK) != XFS_DINODE_FMT_BTREE),
- mp, XFS_ERRTAG_BMAPIFORMAT))) {
- XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, mp);
- error = -EFSCORRUPTED;
- goto out_unlock;
- }
-
- XFS_STATS_INC(mp, xs_blk_mapw);
-
- if (!(ifp->if_flags & XFS_IFEXTENTS)) {
- error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
- if (error)
- goto out_unlock;
- }
-
- eof = !xfs_iext_lookup_extent(ip, ifp, offset_fsb, &icur, &got);
- if (!eof && got.br_startoff <= offset_fsb) {
- if (xfs_is_reflink_inode(ip)) {
- bool shared;
-
- end_fsb = min(XFS_B_TO_FSB(mp, offset + count),
- maxbytes_fsb);
- xfs_trim_extent(&got, offset_fsb, end_fsb - offset_fsb);
- error = xfs_reflink_reserve_cow(ip, &got, &shared);
- if (error)
- goto out_unlock;
- }
-
- trace_xfs_iomap_found(ip, offset, count, 0, &got);
- goto done;
- }
-
- error = xfs_qm_dqattach_locked(ip, false);
- if (error)
- goto out_unlock;
-
- /*
- * We cap the maximum length we map here to MAX_WRITEBACK_PAGES pages
- * to keep the chunks of work done where somewhat symmetric with the
- * work writeback does. This is a completely arbitrary number pulled
- * out of thin air as a best guess for initial testing.
- *
- * Note that the values needs to be less than 32-bits wide until
- * the lower level functions are updated.
- */
- count = min_t(loff_t, count, 1024 * PAGE_SIZE);
- end_fsb = min(XFS_B_TO_FSB(mp, offset + count), maxbytes_fsb);
-
- if (eof) {
- prealloc_blocks = xfs_iomap_prealloc_size(ip, offset, count,
- &icur);
- if (prealloc_blocks) {
- xfs_extlen_t align;
- xfs_off_t end_offset;
- xfs_fileoff_t p_end_fsb;
-
- end_offset = XFS_WRITEIO_ALIGN(mp, offset + count - 1);
- p_end_fsb = XFS_B_TO_FSBT(mp, end_offset) +
- prealloc_blocks;
-
- align = xfs_eof_alignment(ip, 0);
- if (align)
- p_end_fsb = roundup_64(p_end_fsb, align);
-
- p_end_fsb = min(p_end_fsb, maxbytes_fsb);
- ASSERT(p_end_fsb > offset_fsb);
- prealloc_blocks = p_end_fsb - end_fsb;
- }
- }
-
-retry:
- error = xfs_bmapi_reserve_delalloc(ip, XFS_DATA_FORK, offset_fsb,
- end_fsb - offset_fsb, prealloc_blocks, &got, &icur,
- eof);
- switch (error) {
- case 0:
- break;
- case -ENOSPC:
- case -EDQUOT:
- /* retry without any preallocation */
- trace_xfs_delalloc_enospc(ip, offset, count);
- if (prealloc_blocks) {
- prealloc_blocks = 0;
- goto retry;
- }
- /*FALLTHRU*/
- default:
- goto out_unlock;
- }
-
- /*
- * Flag newly allocated delalloc blocks with IOMAP_F_NEW so we punch
- * them out if the write happens to fail.
- */
- iomap->flags |= IOMAP_F_NEW;
- trace_xfs_iomap_alloc(ip, offset, count, 0, &got);
-done:
- if (isnullstartblock(got.br_startblock))
- got.br_startblock = DELAYSTARTBLOCK;
-
- if (!got.br_startblock) {
- error = xfs_alert_fsblock_zero(ip, &got);
- if (error)
- goto out_unlock;
- }
-
- xfs_bmbt_to_iomap(ip, iomap, &got);
-
-out_unlock:
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- return error;
-}
-
-/*
- * Pass in a delayed allocate extent, convert it to real extents;
- * return to the caller the extent we create which maps on top of
- * the originating callers request.
- *
- * Called without a lock on the inode.
- *
- * We no longer bother to look at the incoming map - all we have to
- * guarantee is that whatever we allocate fills the required range.
- */
-int
-xfs_iomap_write_allocate(
- xfs_inode_t *ip,
- int whichfork,
- xfs_off_t offset,
- xfs_bmbt_irec_t *imap,
- unsigned int *cow_seq)
-{
- xfs_mount_t *mp = ip->i_mount;
- struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
- xfs_fileoff_t offset_fsb, last_block;
- xfs_fileoff_t end_fsb, map_start_fsb;
- xfs_filblks_t count_fsb;
- xfs_trans_t *tp;
- int nimaps;
- int error = 0;
- int flags = XFS_BMAPI_DELALLOC;
- int nres;
-
- if (whichfork == XFS_COW_FORK)
- flags |= XFS_BMAPI_COWFORK | XFS_BMAPI_PREALLOC;
-
- /*
- * Make sure that the dquots are there.
- */
- error = xfs_qm_dqattach(ip);
- if (error)
- return error;
-
- offset_fsb = XFS_B_TO_FSBT(mp, offset);
- count_fsb = imap->br_blockcount;
- map_start_fsb = imap->br_startoff;
-
- XFS_STATS_ADD(mp, xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
-
- while (count_fsb != 0) {
- /*
- * Set up a transaction with which to allocate the
- * backing store for the file. Do allocations in a
- * loop until we get some space in the range we are
- * interested in. The other space that might be allocated
- * is in the delayed allocation extent on which we sit
- * but before our buffer starts.
- */
- nimaps = 0;
- while (nimaps == 0) {
- nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
- /*
- * We have already reserved space for the extent and any
- * indirect blocks when creating the delalloc extent,
- * there is no need to reserve space in this transaction
- * again.
- */
- error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, 0,
- 0, XFS_TRANS_RESERVE, &tp);
- if (error)
- return error;
-
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- xfs_trans_ijoin(tp, ip, 0);
-
- /*
- * it is possible that the extents have changed since
- * we did the read call as we dropped the ilock for a
- * while. We have to be careful about truncates or hole
- * punchs here - we are not allowed to allocate
- * non-delalloc blocks here.
- *
- * The only protection against truncation is the pages
- * for the range we are being asked to convert are
- * locked and hence a truncate will block on them
- * first.
- *
- * As a result, if we go beyond the range we really
- * need and hit an delalloc extent boundary followed by
- * a hole while we have excess blocks in the map, we
- * will fill the hole incorrectly and overrun the
- * transaction reservation.
- *
- * Using a single map prevents this as we are forced to
- * check each map we look for overlap with the desired
- * range and abort as soon as we find it. Also, given
- * that we only return a single map, having one beyond
- * what we can return is probably a bit silly.
- *
- * We also need to check that we don't go beyond EOF;
- * this is a truncate optimisation as a truncate sets
- * the new file size before block on the pages we
- * currently have locked under writeback. Because they
- * are about to be tossed, we don't need to write them
- * back....
- */
- nimaps = 1;
- end_fsb = XFS_B_TO_FSB(mp, XFS_ISIZE(ip));
- error = xfs_bmap_last_offset(ip, &last_block,
- XFS_DATA_FORK);
- if (error)
- goto trans_cancel;
-
- last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
- if ((map_start_fsb + count_fsb) > last_block) {
- count_fsb = last_block - map_start_fsb;
- if (count_fsb == 0) {
- error = -EAGAIN;
- goto trans_cancel;
- }
- }
-
- /*
- * From this point onwards we overwrite the imap
- * pointer that the caller gave to us.
- */
- error = xfs_bmapi_write(tp, ip, map_start_fsb,
- count_fsb, flags, nres, imap,
- &nimaps);
- if (error)
- goto trans_cancel;
-
- error = xfs_trans_commit(tp);
- if (error)
- goto error0;
-
- if (whichfork == XFS_COW_FORK)
- *cow_seq = READ_ONCE(ifp->if_seq);
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- }
-
- /*
- * See if we were able to allocate an extent that
- * covers at least part of the callers request
- */
- if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip)))
- return xfs_alert_fsblock_zero(ip, imap);
-
- if ((offset_fsb >= imap->br_startoff) &&
- (offset_fsb < (imap->br_startoff +
- imap->br_blockcount))) {
- XFS_STATS_INC(mp, xs_xstrat_quick);
- return 0;
- }
-
- /*
- * So far we have not mapped the requested part of the
- * file, just surrounding data, try again.
- */
- count_fsb -= imap->br_blockcount;
- map_start_fsb = imap->br_startoff + imap->br_blockcount;
- }
-
-trans_cancel:
- xfs_trans_cancel(tp);
-error0:
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- return error;
}
int
@@ -839,6 +533,11 @@
*/
resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
+ /* Attach dquots so that bmbt splits are accounted correctly. */
+ error = xfs_qm_dqattach(ip);
+ if (error)
+ return error;
+
do {
/*
* Set up a transaction to convert the range of extents
@@ -850,12 +549,17 @@
* complete here and might deadlock on the iolock.
*/
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0,
- XFS_TRANS_RESERVE | XFS_TRANS_NOFS, &tp);
+ XFS_TRANS_RESERVE, &tp);
if (error)
return error;
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, 0);
+
+ error = xfs_trans_reserve_quota_nblks(tp, ip, resblks, 0,
+ XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES);
+ if (error)
+ goto error_on_bmapi_transaction;
/*
* Modify the unwritten extent state of the buffer.
@@ -888,7 +592,7 @@
if (error)
return error;
- if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip)))
+ if (unlikely(!xfs_valid_startblock(ip, imap.br_startblock)))
return xfs_alert_fsblock_zero(ip, &imap);
if ((numblks_fsb = imap.br_blockcount) == 0) {
@@ -914,23 +618,42 @@
static inline bool
imap_needs_alloc(
struct inode *inode,
+ unsigned flags,
struct xfs_bmbt_irec *imap,
int nimaps)
{
- return !nimaps ||
- imap->br_startblock == HOLESTARTBLOCK ||
- imap->br_startblock == DELAYSTARTBLOCK ||
- (IS_DAX(inode) && imap->br_state == XFS_EXT_UNWRITTEN);
+ /* don't allocate blocks when just zeroing */
+ if (flags & IOMAP_ZERO)
+ return false;
+ if (!nimaps ||
+ imap->br_startblock == HOLESTARTBLOCK ||
+ imap->br_startblock == DELAYSTARTBLOCK)
+ return true;
+ /* we convert unwritten extents before copying the data for DAX */
+ if (IS_DAX(inode) && imap->br_state == XFS_EXT_UNWRITTEN)
+ return true;
+ return false;
}
static inline bool
-needs_cow_for_zeroing(
+imap_needs_cow(
+ struct xfs_inode *ip,
+ unsigned int flags,
struct xfs_bmbt_irec *imap,
int nimaps)
{
- return nimaps &&
- imap->br_startblock != HOLESTARTBLOCK &&
- imap->br_state != XFS_EXT_UNWRITTEN;
+ if (!xfs_is_cow_inode(ip))
+ return false;
+
+ /* when zeroing we don't have to COW holes or unwritten extents */
+ if (flags & IOMAP_ZERO) {
+ if (!nimaps ||
+ imap->br_startblock == HOLESTARTBLOCK ||
+ imap->br_state == XFS_EXT_UNWRITTEN)
+ return false;
+ }
+
+ return true;
}
static int
@@ -946,15 +669,8 @@
* COW writes may allocate delalloc space or convert unwritten COW
* extents, so we need to make sure to take the lock exclusively here.
*/
- if (xfs_is_reflink_inode(ip) && is_write) {
- /*
- * FIXME: It could still overwrite on unshared extents and not
- * need allocation.
- */
- if (flags & IOMAP_NOWAIT)
- return -EAGAIN;
+ if (xfs_is_cow_inode(ip) && is_write)
mode = XFS_ILOCK_EXCL;
- }
/*
* Extents not yet cached requires exclusive access, don't block. This
@@ -980,7 +696,7 @@
* check, so if we got ILOCK_SHARED for a write and but we're now a
* reflink inode we have to switch to ILOCK_EXCL and relock.
*/
- if (mode == XFS_ILOCK_SHARED && is_write && xfs_is_reflink_inode(ip)) {
+ if (mode == XFS_ILOCK_SHARED && is_write && xfs_is_cow_inode(ip)) {
xfs_iunlock(ip, mode);
mode = XFS_ILOCK_EXCL;
goto relock;
@@ -990,102 +706,103 @@
return 0;
}
+/*
+ * Check that the imap we are going to return to the caller spans the entire
+ * range that the caller requested for the IO.
+ */
+static bool
+imap_spans_range(
+ struct xfs_bmbt_irec *imap,
+ xfs_fileoff_t offset_fsb,
+ xfs_fileoff_t end_fsb)
+{
+ if (imap->br_startoff > offset_fsb)
+ return false;
+ if (imap->br_startoff + imap->br_blockcount < end_fsb)
+ return false;
+ return true;
+}
+
static int
-xfs_file_iomap_begin(
+xfs_direct_write_iomap_begin(
struct inode *inode,
loff_t offset,
loff_t length,
unsigned flags,
- struct iomap *iomap)
+ struct iomap *iomap,
+ struct iomap *srcmap)
{
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
- struct xfs_bmbt_irec imap;
- xfs_fileoff_t offset_fsb, end_fsb;
+ struct xfs_bmbt_irec imap, cmap;
+ xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
+ xfs_fileoff_t end_fsb = xfs_iomap_end_fsb(mp, offset, length);
int nimaps = 1, error = 0;
- bool shared = false, trimmed = false;
+ bool shared = false;
+ u16 iomap_flags = 0;
unsigned lockmode;
+
+ ASSERT(flags & (IOMAP_WRITE | IOMAP_ZERO));
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
- if (((flags & (IOMAP_WRITE | IOMAP_DIRECT)) == IOMAP_WRITE) &&
- !IS_DAX(inode) && !xfs_get_extsz_hint(ip)) {
- /* Reserve delalloc blocks for regular writeback. */
- return xfs_file_iomap_begin_delay(inode, offset, length, iomap);
- }
-
/*
- * Lock the inode in the manner required for the specified operation and
- * check for as many conditions that would result in blocking as
- * possible. This removes most of the non-blocking checks from the
- * mapping code below.
+ * Writes that span EOF might trigger an IO size update on completion,
+ * so consider them to be dirty for the purposes of O_DSYNC even if
+ * there is no other metadata changes pending or have been made here.
*/
+ if (offset + length > i_size_read(inode))
+ iomap_flags |= IOMAP_F_DIRTY;
+
error = xfs_ilock_for_iomap(ip, flags, &lockmode);
if (error)
return error;
-
- ASSERT(offset <= mp->m_super->s_maxbytes);
- if (offset > mp->m_super->s_maxbytes - length)
- length = mp->m_super->s_maxbytes - offset;
- offset_fsb = XFS_B_TO_FSBT(mp, offset);
- end_fsb = XFS_B_TO_FSB(mp, offset + length);
error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
&nimaps, 0);
if (error)
goto out_unlock;
- if (flags & IOMAP_REPORT) {
- /* Trim the mapping to the nearest shared extent boundary. */
- error = xfs_reflink_trim_around_shared(ip, &imap, &shared,
- &trimmed);
+ if (imap_needs_cow(ip, flags, &imap, nimaps)) {
+ error = -EAGAIN;
+ if (flags & IOMAP_NOWAIT)
+ goto out_unlock;
+
+ /* may drop and re-acquire the ilock */
+ error = xfs_reflink_allocate_cow(ip, &imap, &cmap, &shared,
+ &lockmode, flags & IOMAP_DIRECT);
if (error)
goto out_unlock;
- }
-
- /* Non-modifying mapping requested, so we are done */
- if (!(flags & (IOMAP_WRITE | IOMAP_ZERO)))
- goto out_found;
-
- /*
- * Break shared extents if necessary. Checks for non-blocking IO have
- * been done up front, so we don't need to do them here.
- */
- if (xfs_is_reflink_inode(ip)) {
- /* if zeroing doesn't need COW allocation, then we are done. */
- if ((flags & IOMAP_ZERO) &&
- !needs_cow_for_zeroing(&imap, nimaps))
- goto out_found;
-
- if (flags & IOMAP_DIRECT) {
- /* may drop and re-acquire the ilock */
- error = xfs_reflink_allocate_cow(ip, &imap, &shared,
- &lockmode);
- if (error)
- goto out_unlock;
- } else {
- error = xfs_reflink_reserve_cow(ip, &imap, &shared);
- if (error)
- goto out_unlock;
- }
-
+ if (shared)
+ goto out_found_cow;
end_fsb = imap.br_startoff + imap.br_blockcount;
length = XFS_FSB_TO_B(mp, end_fsb) - offset;
}
- /* Don't need to allocate over holes when doing zeroing operations. */
- if (flags & IOMAP_ZERO)
- goto out_found;
+ if (imap_needs_alloc(inode, flags, &imap, nimaps))
+ goto allocate_blocks;
- if (!imap_needs_alloc(inode, &imap, nimaps))
- goto out_found;
-
- /* If nowait is set bail since we are going to make allocations. */
- if (flags & IOMAP_NOWAIT) {
+ /*
+ * NOWAIT IO needs to span the entire requested IO with a single map so
+ * that we avoid partial IO failures due to the rest of the IO range not
+ * covered by this map triggering an EAGAIN condition when it is
+ * subsequently mapped and aborting the IO.
+ */
+ if ((flags & IOMAP_NOWAIT) &&
+ !imap_spans_range(&imap, offset_fsb, end_fsb)) {
error = -EAGAIN;
goto out_unlock;
}
+
+ xfs_iunlock(ip, lockmode);
+ trace_xfs_iomap_found(ip, offset, length, XFS_DATA_FORK, &imap);
+ return xfs_bmbt_to_iomap(ip, iomap, &imap, iomap_flags);
+
+allocate_blocks:
+ error = -EAGAIN;
+ if (flags & IOMAP_NOWAIT)
+ goto out_unlock;
/*
* We cap the maximum length we map to a sane size to keep the chunks
@@ -1097,55 +814,282 @@
* lower level functions are updated.
*/
length = min_t(loff_t, length, 1024 * PAGE_SIZE);
+ end_fsb = xfs_iomap_end_fsb(mp, offset, length);
- /*
- * xfs_iomap_write_direct() expects the shared lock. It is unlocked on
- * return.
- */
- if (lockmode == XFS_ILOCK_EXCL)
- xfs_ilock_demote(ip, lockmode);
- error = xfs_iomap_write_direct(ip, offset, length, &imap,
- nimaps);
+ if (offset + length > XFS_ISIZE(ip))
+ end_fsb = xfs_iomap_eof_align_last_fsb(ip, end_fsb);
+ else if (nimaps && imap.br_startblock == HOLESTARTBLOCK)
+ end_fsb = min(end_fsb, imap.br_startoff + imap.br_blockcount);
+ xfs_iunlock(ip, lockmode);
+
+ error = xfs_iomap_write_direct(ip, offset_fsb, end_fsb - offset_fsb,
+ &imap);
if (error)
return error;
- iomap->flags |= IOMAP_F_NEW;
- trace_xfs_iomap_alloc(ip, offset, length, 0, &imap);
+ trace_xfs_iomap_alloc(ip, offset, length, XFS_DATA_FORK, &imap);
+ return xfs_bmbt_to_iomap(ip, iomap, &imap, iomap_flags | IOMAP_F_NEW);
-out_finish:
- if (xfs_ipincount(ip) && (ip->i_itemp->ili_fsync_fields
- & ~XFS_ILOG_TIMESTAMP))
- iomap->flags |= IOMAP_F_DIRTY;
-
- xfs_bmbt_to_iomap(ip, iomap, &imap);
-
- if (shared)
- iomap->flags |= IOMAP_F_SHARED;
- return 0;
-
-out_found:
- ASSERT(nimaps);
+out_found_cow:
xfs_iunlock(ip, lockmode);
- trace_xfs_iomap_found(ip, offset, length, 0, &imap);
- goto out_finish;
+ length = XFS_FSB_TO_B(mp, cmap.br_startoff + cmap.br_blockcount);
+ trace_xfs_iomap_found(ip, offset, length - offset, XFS_COW_FORK, &cmap);
+ if (imap.br_startblock != HOLESTARTBLOCK) {
+ error = xfs_bmbt_to_iomap(ip, srcmap, &imap, 0);
+ if (error)
+ return error;
+ }
+ return xfs_bmbt_to_iomap(ip, iomap, &cmap, IOMAP_F_SHARED);
out_unlock:
xfs_iunlock(ip, lockmode);
return error;
}
+const struct iomap_ops xfs_direct_write_iomap_ops = {
+ .iomap_begin = xfs_direct_write_iomap_begin,
+};
+
static int
-xfs_file_iomap_end_delalloc(
- struct xfs_inode *ip,
+xfs_buffered_write_iomap_begin(
+ struct inode *inode,
+ loff_t offset,
+ loff_t count,
+ unsigned flags,
+ struct iomap *iomap,
+ struct iomap *srcmap)
+{
+ struct xfs_inode *ip = XFS_I(inode);
+ struct xfs_mount *mp = ip->i_mount;
+ xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
+ xfs_fileoff_t end_fsb = xfs_iomap_end_fsb(mp, offset, count);
+ struct xfs_bmbt_irec imap, cmap;
+ struct xfs_iext_cursor icur, ccur;
+ xfs_fsblock_t prealloc_blocks = 0;
+ bool eof = false, cow_eof = false, shared = false;
+ int allocfork = XFS_DATA_FORK;
+ int error = 0;
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+ /* we can't use delayed allocations when using extent size hints */
+ if (xfs_get_extsz_hint(ip))
+ return xfs_direct_write_iomap_begin(inode, offset, count,
+ flags, iomap, srcmap);
+
+ ASSERT(!XFS_IS_REALTIME_INODE(ip));
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+
+ if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(&ip->i_df)) ||
+ XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
+ error = -EFSCORRUPTED;
+ goto out_unlock;
+ }
+
+ XFS_STATS_INC(mp, xs_blk_mapw);
+
+ if (!(ip->i_df.if_flags & XFS_IFEXTENTS)) {
+ error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
+ if (error)
+ goto out_unlock;
+ }
+
+ /*
+ * Search the data fork first to look up our source mapping. We
+ * always need the data fork map, as we have to return it to the
+ * iomap code so that the higher level write code can read data in to
+ * perform read-modify-write cycles for unaligned writes.
+ */
+ eof = !xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap);
+ if (eof)
+ imap.br_startoff = end_fsb; /* fake hole until the end */
+
+ /* We never need to allocate blocks for zeroing a hole. */
+ if ((flags & IOMAP_ZERO) && imap.br_startoff > offset_fsb) {
+ xfs_hole_to_iomap(ip, iomap, offset_fsb, imap.br_startoff);
+ goto out_unlock;
+ }
+
+ /*
+ * Search the COW fork extent list even if we did not find a data fork
+ * extent. This serves two purposes: first this implements the
+ * speculative preallocation using cowextsize, so that we also unshare
+ * block adjacent to shared blocks instead of just the shared blocks
+ * themselves. Second the lookup in the extent list is generally faster
+ * than going out to the shared extent tree.
+ */
+ if (xfs_is_cow_inode(ip)) {
+ if (!ip->i_cowfp) {
+ ASSERT(!xfs_is_reflink_inode(ip));
+ xfs_ifork_init_cow(ip);
+ }
+ cow_eof = !xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb,
+ &ccur, &cmap);
+ if (!cow_eof && cmap.br_startoff <= offset_fsb) {
+ trace_xfs_reflink_cow_found(ip, &cmap);
+ goto found_cow;
+ }
+ }
+
+ if (imap.br_startoff <= offset_fsb) {
+ /*
+ * For reflink files we may need a delalloc reservation when
+ * overwriting shared extents. This includes zeroing of
+ * existing extents that contain data.
+ */
+ if (!xfs_is_cow_inode(ip) ||
+ ((flags & IOMAP_ZERO) && imap.br_state != XFS_EXT_NORM)) {
+ trace_xfs_iomap_found(ip, offset, count, XFS_DATA_FORK,
+ &imap);
+ goto found_imap;
+ }
+
+ xfs_trim_extent(&imap, offset_fsb, end_fsb - offset_fsb);
+
+ /* Trim the mapping to the nearest shared extent boundary. */
+ error = xfs_bmap_trim_cow(ip, &imap, &shared);
+ if (error)
+ goto out_unlock;
+
+ /* Not shared? Just report the (potentially capped) extent. */
+ if (!shared) {
+ trace_xfs_iomap_found(ip, offset, count, XFS_DATA_FORK,
+ &imap);
+ goto found_imap;
+ }
+
+ /*
+ * Fork all the shared blocks from our write offset until the
+ * end of the extent.
+ */
+ allocfork = XFS_COW_FORK;
+ end_fsb = imap.br_startoff + imap.br_blockcount;
+ } else {
+ /*
+ * We cap the maximum length we map here to MAX_WRITEBACK_PAGES
+ * pages to keep the chunks of work done where somewhat
+ * symmetric with the work writeback does. This is a completely
+ * arbitrary number pulled out of thin air.
+ *
+ * Note that the values needs to be less than 32-bits wide until
+ * the lower level functions are updated.
+ */
+ count = min_t(loff_t, count, 1024 * PAGE_SIZE);
+ end_fsb = xfs_iomap_end_fsb(mp, offset, count);
+
+ if (xfs_is_always_cow_inode(ip))
+ allocfork = XFS_COW_FORK;
+ }
+
+ error = xfs_qm_dqattach_locked(ip, false);
+ if (error)
+ goto out_unlock;
+
+ if (eof && offset + count > XFS_ISIZE(ip)) {
+ /*
+ * Determine the initial size of the preallocation.
+ * We clean up any extra preallocation when the file is closed.
+ */
+ if (mp->m_flags & XFS_MOUNT_ALLOCSIZE)
+ prealloc_blocks = mp->m_allocsize_blocks;
+ else
+ prealloc_blocks = xfs_iomap_prealloc_size(ip, allocfork,
+ offset, count, &icur);
+ if (prealloc_blocks) {
+ xfs_extlen_t align;
+ xfs_off_t end_offset;
+ xfs_fileoff_t p_end_fsb;
+
+ end_offset = XFS_ALLOC_ALIGN(mp, offset + count - 1);
+ p_end_fsb = XFS_B_TO_FSBT(mp, end_offset) +
+ prealloc_blocks;
+
+ align = xfs_eof_alignment(ip);
+ if (align)
+ p_end_fsb = roundup_64(p_end_fsb, align);
+
+ p_end_fsb = min(p_end_fsb,
+ XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes));
+ ASSERT(p_end_fsb > offset_fsb);
+ prealloc_blocks = p_end_fsb - end_fsb;
+ }
+ }
+
+retry:
+ error = xfs_bmapi_reserve_delalloc(ip, allocfork, offset_fsb,
+ end_fsb - offset_fsb, prealloc_blocks,
+ allocfork == XFS_DATA_FORK ? &imap : &cmap,
+ allocfork == XFS_DATA_FORK ? &icur : &ccur,
+ allocfork == XFS_DATA_FORK ? eof : cow_eof);
+ switch (error) {
+ case 0:
+ break;
+ case -ENOSPC:
+ case -EDQUOT:
+ /* retry without any preallocation */
+ trace_xfs_delalloc_enospc(ip, offset, count);
+ if (prealloc_blocks) {
+ prealloc_blocks = 0;
+ goto retry;
+ }
+ /*FALLTHRU*/
+ default:
+ goto out_unlock;
+ }
+
+ if (allocfork == XFS_COW_FORK) {
+ trace_xfs_iomap_alloc(ip, offset, count, allocfork, &cmap);
+ goto found_cow;
+ }
+
+ /*
+ * Flag newly allocated delalloc blocks with IOMAP_F_NEW so we punch
+ * them out if the write happens to fail.
+ */
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ trace_xfs_iomap_alloc(ip, offset, count, allocfork, &imap);
+ return xfs_bmbt_to_iomap(ip, iomap, &imap, IOMAP_F_NEW);
+
+found_imap:
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return xfs_bmbt_to_iomap(ip, iomap, &imap, 0);
+
+found_cow:
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ if (imap.br_startoff <= offset_fsb) {
+ error = xfs_bmbt_to_iomap(ip, srcmap, &imap, 0);
+ if (error)
+ return error;
+ return xfs_bmbt_to_iomap(ip, iomap, &cmap, IOMAP_F_SHARED);
+ }
+
+ xfs_trim_extent(&cmap, offset_fsb, imap.br_startoff - offset_fsb);
+ return xfs_bmbt_to_iomap(ip, iomap, &cmap, 0);
+
+out_unlock:
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return error;
+}
+
+static int
+xfs_buffered_write_iomap_end(
+ struct inode *inode,
loff_t offset,
loff_t length,
ssize_t written,
+ unsigned flags,
struct iomap *iomap)
{
+ struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
xfs_fileoff_t start_fsb;
xfs_fileoff_t end_fsb;
int error = 0;
+
+ if (iomap->type != IOMAP_DELALLOC)
+ return 0;
/*
* Behave as if the write failed if drop writes is enabled. Set the NEW
@@ -1191,24 +1135,137 @@
return 0;
}
+const struct iomap_ops xfs_buffered_write_iomap_ops = {
+ .iomap_begin = xfs_buffered_write_iomap_begin,
+ .iomap_end = xfs_buffered_write_iomap_end,
+};
+
static int
-xfs_file_iomap_end(
+xfs_read_iomap_begin(
struct inode *inode,
loff_t offset,
loff_t length,
- ssize_t written,
unsigned flags,
- struct iomap *iomap)
+ struct iomap *iomap,
+ struct iomap *srcmap)
{
- if ((flags & IOMAP_WRITE) && iomap->type == IOMAP_DELALLOC)
- return xfs_file_iomap_end_delalloc(XFS_I(inode), offset,
- length, written, iomap);
- return 0;
+ struct xfs_inode *ip = XFS_I(inode);
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_bmbt_irec imap;
+ xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
+ xfs_fileoff_t end_fsb = xfs_iomap_end_fsb(mp, offset, length);
+ int nimaps = 1, error = 0;
+ bool shared = false;
+ unsigned lockmode;
+
+ ASSERT(!(flags & (IOMAP_WRITE | IOMAP_ZERO)));
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+ error = xfs_ilock_for_iomap(ip, flags, &lockmode);
+ if (error)
+ return error;
+ error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
+ &nimaps, 0);
+ if (!error && (flags & IOMAP_REPORT))
+ error = xfs_reflink_trim_around_shared(ip, &imap, &shared);
+ xfs_iunlock(ip, lockmode);
+
+ if (error)
+ return error;
+ trace_xfs_iomap_found(ip, offset, length, XFS_DATA_FORK, &imap);
+ return xfs_bmbt_to_iomap(ip, iomap, &imap, shared ? IOMAP_F_SHARED : 0);
}
-const struct iomap_ops xfs_iomap_ops = {
- .iomap_begin = xfs_file_iomap_begin,
- .iomap_end = xfs_file_iomap_end,
+const struct iomap_ops xfs_read_iomap_ops = {
+ .iomap_begin = xfs_read_iomap_begin,
+};
+
+static int
+xfs_seek_iomap_begin(
+ struct inode *inode,
+ loff_t offset,
+ loff_t length,
+ unsigned flags,
+ struct iomap *iomap,
+ struct iomap *srcmap)
+{
+ struct xfs_inode *ip = XFS_I(inode);
+ struct xfs_mount *mp = ip->i_mount;
+ xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
+ xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + length);
+ xfs_fileoff_t cow_fsb = NULLFILEOFF, data_fsb = NULLFILEOFF;
+ struct xfs_iext_cursor icur;
+ struct xfs_bmbt_irec imap, cmap;
+ int error = 0;
+ unsigned lockmode;
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+ lockmode = xfs_ilock_data_map_shared(ip);
+ if (!(ip->i_df.if_flags & XFS_IFEXTENTS)) {
+ error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK);
+ if (error)
+ goto out_unlock;
+ }
+
+ if (xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &icur, &imap)) {
+ /*
+ * If we found a data extent we are done.
+ */
+ if (imap.br_startoff <= offset_fsb)
+ goto done;
+ data_fsb = imap.br_startoff;
+ } else {
+ /*
+ * Fake a hole until the end of the file.
+ */
+ data_fsb = xfs_iomap_end_fsb(mp, offset, length);
+ }
+
+ /*
+ * If a COW fork extent covers the hole, report it - capped to the next
+ * data fork extent:
+ */
+ if (xfs_inode_has_cow_data(ip) &&
+ xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, &cmap))
+ cow_fsb = cmap.br_startoff;
+ if (cow_fsb != NULLFILEOFF && cow_fsb <= offset_fsb) {
+ if (data_fsb < cow_fsb + cmap.br_blockcount)
+ end_fsb = min(end_fsb, data_fsb);
+ xfs_trim_extent(&cmap, offset_fsb, end_fsb);
+ error = xfs_bmbt_to_iomap(ip, iomap, &cmap, IOMAP_F_SHARED);
+ /*
+ * This is a COW extent, so we must probe the page cache
+ * because there could be dirty page cache being backed
+ * by this extent.
+ */
+ iomap->type = IOMAP_UNWRITTEN;
+ goto out_unlock;
+ }
+
+ /*
+ * Else report a hole, capped to the next found data or COW extent.
+ */
+ if (cow_fsb != NULLFILEOFF && cow_fsb < data_fsb)
+ imap.br_blockcount = cow_fsb - offset_fsb;
+ else
+ imap.br_blockcount = data_fsb - offset_fsb;
+ imap.br_startoff = offset_fsb;
+ imap.br_startblock = HOLESTARTBLOCK;
+ imap.br_state = XFS_EXT_NORM;
+done:
+ xfs_trim_extent(&imap, offset_fsb, end_fsb);
+ error = xfs_bmbt_to_iomap(ip, iomap, &imap, 0);
+out_unlock:
+ xfs_iunlock(ip, lockmode);
+ return error;
+}
+
+const struct iomap_ops xfs_seek_iomap_ops = {
+ .iomap_begin = xfs_seek_iomap_begin,
};
static int
@@ -1217,7 +1274,8 @@
loff_t offset,
loff_t length,
unsigned flags,
- struct iomap *iomap)
+ struct iomap *iomap,
+ struct iomap *srcmap)
{
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
@@ -1233,23 +1291,21 @@
lockmode = xfs_ilock_attr_map_shared(ip);
/* if there are no attribute fork or extents, return ENOENT */
- if (!XFS_IFORK_Q(ip) || !ip->i_d.di_anextents) {
+ if (!XFS_IFORK_Q(ip) || !ip->i_afp->if_nextents) {
error = -ENOENT;
goto out_unlock;
}
- ASSERT(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL);
+ ASSERT(ip->i_afp->if_format != XFS_DINODE_FMT_LOCAL);
error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
&nimaps, XFS_BMAPI_ATTRFORK);
out_unlock:
xfs_iunlock(ip, lockmode);
- if (!error) {
- ASSERT(nimaps);
- xfs_bmbt_to_iomap(ip, iomap, &imap);
- }
-
- return error;
+ if (error)
+ return error;
+ ASSERT(nimaps);
+ return xfs_bmbt_to_iomap(ip, iomap, &imap, 0);
}
const struct iomap_ops xfs_xattr_iomap_ops = {
--
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