Update Linux to v5.10.109
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.109.tar.xz
Change-Id: I19bca9fc6762d4e63bcf3e4cba88bbe560d9c76c
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 904d828..6fa05fb 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -143,8 +143,6 @@
error = xfs_alloc_read_agf(mp, tp, agno, 0, &agbp);
if (error)
return error;
- if (!agbp)
- return -ENOMEM;
cur = xfs_refcountbt_init_cursor(mp, tp, agbp, agno);
@@ -181,7 +179,7 @@
int error = 0;
/* Holes, unwritten, and delalloc extents cannot be shared */
- if (!xfs_is_cow_inode(ip) || !xfs_bmap_is_real_extent(irec)) {
+ if (!xfs_is_cow_inode(ip) || !xfs_bmap_is_written_extent(irec)) {
*shared = false;
return 0;
}
@@ -223,8 +221,8 @@
}
}
-bool
-xfs_inode_need_cow(
+int
+xfs_bmap_trim_cow(
struct xfs_inode *ip,
struct xfs_bmbt_irec *imap,
bool *shared)
@@ -308,13 +306,13 @@
xfs_find_trim_cow_extent(
struct xfs_inode *ip,
struct xfs_bmbt_irec *imap,
+ struct xfs_bmbt_irec *cmap,
bool *shared,
bool *found)
{
xfs_fileoff_t offset_fsb = imap->br_startoff;
xfs_filblks_t count_fsb = imap->br_blockcount;
struct xfs_iext_cursor icur;
- struct xfs_bmbt_irec got;
*found = false;
@@ -322,23 +320,22 @@
* If we don't find an overlapping extent, trim the range we need to
* allocate to fit the hole we found.
*/
- if (!xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, &got))
- got.br_startoff = offset_fsb + count_fsb;
- if (got.br_startoff > offset_fsb) {
+ if (!xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &icur, cmap))
+ cmap->br_startoff = offset_fsb + count_fsb;
+ if (cmap->br_startoff > offset_fsb) {
xfs_trim_extent(imap, imap->br_startoff,
- got.br_startoff - imap->br_startoff);
- return xfs_inode_need_cow(ip, imap, shared);
+ cmap->br_startoff - imap->br_startoff);
+ return xfs_bmap_trim_cow(ip, imap, shared);
}
*shared = true;
- if (isnullstartblock(got.br_startblock)) {
- xfs_trim_extent(imap, got.br_startoff, got.br_blockcount);
+ if (isnullstartblock(cmap->br_startblock)) {
+ xfs_trim_extent(imap, cmap->br_startoff, cmap->br_blockcount);
return 0;
}
/* real extent found - no need to allocate */
- xfs_trim_extent(&got, offset_fsb, count_fsb);
- *imap = got;
+ xfs_trim_extent(cmap, offset_fsb, count_fsb);
*found = true;
return 0;
}
@@ -348,6 +345,7 @@
xfs_reflink_allocate_cow(
struct xfs_inode *ip,
struct xfs_bmbt_irec *imap,
+ struct xfs_bmbt_irec *cmap,
bool *shared,
uint *lockmode,
bool convert_now)
@@ -367,7 +365,7 @@
xfs_ifork_init_cow(ip);
}
- error = xfs_find_trim_cow_extent(ip, imap, shared, &found);
+ error = xfs_find_trim_cow_extent(ip, imap, cmap, shared, &found);
if (error || !*shared)
return error;
if (found)
@@ -392,7 +390,7 @@
/*
* Check for an overlapping extent again now that we dropped the ilock.
*/
- error = xfs_find_trim_cow_extent(ip, imap, shared, &found);
+ error = xfs_find_trim_cow_extent(ip, imap, cmap, shared, &found);
if (error || !*shared)
goto out_trans_cancel;
if (found) {
@@ -410,8 +408,8 @@
/* Allocate the entire reservation as unwritten blocks. */
nimaps = 1;
error = xfs_bmapi_write(tp, ip, imap->br_startoff, imap->br_blockcount,
- XFS_BMAPI_COWFORK | XFS_BMAPI_PREALLOC,
- resblks, imap, &nimaps);
+ XFS_BMAPI_COWFORK | XFS_BMAPI_PREALLOC, 0, cmap,
+ &nimaps);
if (error)
goto out_unreserve;
@@ -427,15 +425,15 @@
if (nimaps == 0)
return -ENOSPC;
convert:
- xfs_trim_extent(imap, offset_fsb, count_fsb);
+ xfs_trim_extent(cmap, offset_fsb, count_fsb);
/*
* COW fork extents are supposed to remain unwritten until we're ready
* to initiate a disk write. For direct I/O we are going to write the
* data and need the conversion, but for buffered writes we're done.
*/
- if (!convert_now || imap->br_state == XFS_EXT_NORM)
+ if (!convert_now || cmap->br_state == XFS_EXT_NORM)
return 0;
- trace_xfs_reflink_convert_cow(ip, imap);
+ trace_xfs_reflink_convert_cow(ip, cmap);
return xfs_reflink_convert_cow_locked(ip, offset_fsb, count_fsb);
out_unreserve:
@@ -657,7 +655,7 @@
* preallocations can leak into the range we are called upon, and we
* need to skip them.
*/
- if (!xfs_bmap_is_real_extent(&got)) {
+ if (!xfs_bmap_is_written_extent(&got)) {
*end_fsb = del.br_startoff;
goto out_cancel;
}
@@ -723,7 +721,7 @@
* repeatedly cycles the ILOCK to allocate one transaction per remapped
* extent.
*
- * If we're being called by writeback then the the pages will still
+ * If we're being called by writeback then the pages will still
* have PageWriteback set, which prevents races with reflink remapping
* and truncate. Reflink remapping prevents races with writeback by
* taking the iolock and mmaplock before flushing the pages and
@@ -986,41 +984,28 @@
}
/*
- * Unmap a range of blocks from a file, then map other blocks into the hole.
- * The range to unmap is (destoff : destoff + srcioff + irec->br_blockcount).
- * The extent irec is mapped into dest at irec->br_startoff.
+ * Remap the given extent into the file. The dmap blockcount will be set to
+ * the number of blocks that were actually remapped.
*/
STATIC int
xfs_reflink_remap_extent(
struct xfs_inode *ip,
- struct xfs_bmbt_irec *irec,
- xfs_fileoff_t destoff,
+ struct xfs_bmbt_irec *dmap,
xfs_off_t new_isize)
{
+ struct xfs_bmbt_irec smap;
struct xfs_mount *mp = ip->i_mount;
- bool real_extent = xfs_bmap_is_real_extent(irec);
struct xfs_trans *tp;
- unsigned int resblks;
- struct xfs_bmbt_irec uirec;
- xfs_filblks_t rlen;
- xfs_filblks_t unmap_len;
xfs_off_t newlen;
- int64_t qres;
+ int64_t qres, qdelta;
+ unsigned int resblks;
+ bool smap_real;
+ bool dmap_written = xfs_bmap_is_written_extent(dmap);
+ int nimaps;
int error;
- unmap_len = irec->br_startoff + irec->br_blockcount - destoff;
- trace_xfs_reflink_punch_range(ip, destoff, unmap_len);
-
- /* No reflinking if we're low on space */
- if (real_extent) {
- error = xfs_reflink_ag_has_free_space(mp,
- XFS_FSB_TO_AGNO(mp, irec->br_startblock));
- if (error)
- goto out;
- }
-
/* Start a rolling transaction to switch the mappings */
- resblks = XFS_EXTENTADD_SPACE_RES(ip->i_mount, XFS_DATA_FORK);
+ resblks = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0, &tp);
if (error)
goto out;
@@ -1029,92 +1014,146 @@
xfs_trans_ijoin(tp, ip, 0);
/*
- * Reserve quota for this operation. We don't know if the first unmap
- * in the dest file will cause a bmap btree split, so we always reserve
- * at least enough blocks for that split. If the extent being mapped
- * in is written, we need to reserve quota for that too.
+ * Read what's currently mapped in the destination file into smap.
+ * If smap isn't a hole, we will have to remove it before we can add
+ * dmap to the destination file.
*/
- qres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
- if (real_extent)
- qres += irec->br_blockcount;
- error = xfs_trans_reserve_quota_nblks(tp, ip, qres, 0,
- XFS_QMOPT_RES_REGBLKS);
+ nimaps = 1;
+ error = xfs_bmapi_read(ip, dmap->br_startoff, dmap->br_blockcount,
+ &smap, &nimaps, 0);
if (error)
goto out_cancel;
+ ASSERT(nimaps == 1 && smap.br_startoff == dmap->br_startoff);
+ smap_real = xfs_bmap_is_real_extent(&smap);
- trace_xfs_reflink_remap(ip, irec->br_startoff,
- irec->br_blockcount, irec->br_startblock);
+ /*
+ * We can only remap as many blocks as the smaller of the two extent
+ * maps, because we can only remap one extent at a time.
+ */
+ dmap->br_blockcount = min(dmap->br_blockcount, smap.br_blockcount);
+ ASSERT(dmap->br_blockcount == smap.br_blockcount);
- /* Unmap the old blocks in the data fork. */
- rlen = unmap_len;
- while (rlen) {
- ASSERT(tp->t_firstblock == NULLFSBLOCK);
- error = __xfs_bunmapi(tp, ip, destoff, &rlen, 0, 1);
- if (error)
- goto out_cancel;
+ trace_xfs_reflink_remap_extent_dest(ip, &smap);
- /*
- * Trim the extent to whatever got unmapped.
- * Remember, bunmapi works backwards.
- */
- uirec.br_startblock = irec->br_startblock + rlen;
- uirec.br_startoff = irec->br_startoff + rlen;
- uirec.br_blockcount = unmap_len - rlen;
- uirec.br_state = irec->br_state;
- unmap_len = rlen;
+ /*
+ * Two extents mapped to the same physical block must not have
+ * different states; that's filesystem corruption. Move on to the next
+ * extent if they're both holes or both the same physical extent.
+ */
+ if (dmap->br_startblock == smap.br_startblock) {
+ if (dmap->br_state != smap.br_state)
+ error = -EFSCORRUPTED;
+ goto out_cancel;
+ }
- /* If this isn't a real mapping, we're done. */
- if (!real_extent || uirec.br_blockcount == 0)
- goto next_extent;
+ /* If both extents are unwritten, leave them alone. */
+ if (dmap->br_state == XFS_EXT_UNWRITTEN &&
+ smap.br_state == XFS_EXT_UNWRITTEN)
+ goto out_cancel;
- trace_xfs_reflink_remap(ip, uirec.br_startoff,
- uirec.br_blockcount, uirec.br_startblock);
-
- /* Update the refcount tree */
- xfs_refcount_increase_extent(tp, &uirec);
-
- /* Map the new blocks into the data fork. */
- xfs_bmap_map_extent(tp, ip, &uirec);
-
- /* Update quota accounting. */
- xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT,
- uirec.br_blockcount);
-
- /* Update dest isize if needed. */
- newlen = XFS_FSB_TO_B(mp,
- uirec.br_startoff + uirec.br_blockcount);
- newlen = min_t(xfs_off_t, newlen, new_isize);
- if (newlen > i_size_read(VFS_I(ip))) {
- trace_xfs_reflink_update_inode_size(ip, newlen);
- i_size_write(VFS_I(ip), newlen);
- ip->i_d.di_size = newlen;
- xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
- }
-
-next_extent:
- /* Process all the deferred stuff. */
- error = xfs_defer_finish(&tp);
+ /* No reflinking if the AG of the dest mapping is low on space. */
+ if (dmap_written) {
+ error = xfs_reflink_ag_has_free_space(mp,
+ XFS_FSB_TO_AGNO(mp, dmap->br_startblock));
if (error)
goto out_cancel;
}
+ /*
+ * Compute quota reservation if we think the quota block counter for
+ * this file could increase.
+ *
+ * Adding a written extent to the extent map can cause a bmbt split,
+ * and removing a mapped extent from the extent can cause a bmbt split.
+ * The two operations cannot both cause a split since they operate on
+ * the same index in the bmap btree, so we only need a reservation for
+ * one bmbt split if either thing is happening.
+ *
+ * If we are mapping a written extent into the file, we need to have
+ * enough quota block count reservation to handle the blocks in that
+ * extent. We log only the delta to the quota block counts, so if the
+ * extent we're unmapping also has blocks allocated to it, we don't
+ * need a quota reservation for the extent itself.
+ *
+ * Note that if we're replacing a delalloc reservation with a written
+ * extent, we have to take the full quota reservation because removing
+ * the delalloc reservation gives the block count back to the quota
+ * count. This is suboptimal, but the VFS flushed the dest range
+ * before we started. That should have removed all the delalloc
+ * reservations, but we code defensively.
+ */
+ qres = qdelta = 0;
+ if (smap_real || dmap_written)
+ qres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
+ if (!smap_real && dmap_written)
+ qres += dmap->br_blockcount;
+ if (qres > 0) {
+ error = xfs_trans_reserve_quota_nblks(tp, ip, qres, 0,
+ XFS_QMOPT_RES_REGBLKS);
+ if (error)
+ goto out_cancel;
+ }
+
+ if (smap_real) {
+ /*
+ * If the extent we're unmapping is backed by storage (written
+ * or not), unmap the extent and drop its refcount.
+ */
+ xfs_bmap_unmap_extent(tp, ip, &smap);
+ xfs_refcount_decrease_extent(tp, &smap);
+ qdelta -= smap.br_blockcount;
+ } else if (smap.br_startblock == DELAYSTARTBLOCK) {
+ xfs_filblks_t len = smap.br_blockcount;
+
+ /*
+ * If the extent we're unmapping is a delalloc reservation,
+ * we can use the regular bunmapi function to release the
+ * incore state. Dropping the delalloc reservation takes care
+ * of the quota reservation for us.
+ */
+ error = __xfs_bunmapi(NULL, ip, smap.br_startoff, &len, 0, 1);
+ if (error)
+ goto out_cancel;
+ ASSERT(len == 0);
+ }
+
+ /*
+ * If the extent we're sharing is backed by written storage, increase
+ * its refcount and map it into the file.
+ */
+ if (dmap_written) {
+ xfs_refcount_increase_extent(tp, dmap);
+ xfs_bmap_map_extent(tp, ip, dmap);
+ qdelta += dmap->br_blockcount;
+ }
+
+ xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, qdelta);
+
+ /* Update dest isize if needed. */
+ newlen = XFS_FSB_TO_B(mp, dmap->br_startoff + dmap->br_blockcount);
+ newlen = min_t(xfs_off_t, newlen, new_isize);
+ if (newlen > i_size_read(VFS_I(ip))) {
+ trace_xfs_reflink_update_inode_size(ip, newlen);
+ i_size_write(VFS_I(ip), newlen);
+ ip->i_d.di_size = newlen;
+ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+ }
+
+ /* Commit everything and unlock. */
error = xfs_trans_commit(tp);
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- if (error)
- goto out;
- return 0;
+ goto out_unlock;
out_cancel:
xfs_trans_cancel(tp);
+out_unlock:
xfs_iunlock(ip, XFS_ILOCK_EXCL);
out:
- trace_xfs_reflink_remap_extent_error(ip, error, _RET_IP_);
+ if (error)
+ trace_xfs_reflink_remap_extent_error(ip, error, _RET_IP_);
return error;
}
-/*
- * Iteratively remap one file's extents (and holes) to another's.
- */
+/* Remap a range of one file to the other. */
int
xfs_reflink_remap_blocks(
struct xfs_inode *src,
@@ -1125,25 +1164,22 @@
loff_t *remapped)
{
struct xfs_bmbt_irec imap;
- xfs_fileoff_t srcoff;
- xfs_fileoff_t destoff;
+ struct xfs_mount *mp = src->i_mount;
+ xfs_fileoff_t srcoff = XFS_B_TO_FSBT(mp, pos_in);
+ xfs_fileoff_t destoff = XFS_B_TO_FSBT(mp, pos_out);
xfs_filblks_t len;
- xfs_filblks_t range_len;
xfs_filblks_t remapped_len = 0;
xfs_off_t new_isize = pos_out + remap_len;
int nimaps;
int error = 0;
- destoff = XFS_B_TO_FSBT(src->i_mount, pos_out);
- srcoff = XFS_B_TO_FSBT(src->i_mount, pos_in);
- len = XFS_B_TO_FSB(src->i_mount, remap_len);
+ len = min_t(xfs_filblks_t, XFS_B_TO_FSB(mp, remap_len),
+ XFS_MAX_FILEOFF);
- /* drange = (destoff, destoff + len); srange = (srcoff, srcoff + len) */
- while (len) {
- uint lock_mode;
+ trace_xfs_reflink_remap_blocks(src, srcoff, len, dest, destoff);
- trace_xfs_reflink_remap_blocks_loop(src, srcoff, len,
- dest, destoff);
+ while (len > 0) {
+ unsigned int lock_mode;
/* Read extent from the source file */
nimaps = 1;
@@ -1152,18 +1188,25 @@
xfs_iunlock(src, lock_mode);
if (error)
break;
- ASSERT(nimaps == 1);
+ /*
+ * The caller supposedly flushed all dirty pages in the source
+ * file range, which means that writeback should have allocated
+ * or deleted all delalloc reservations in that range. If we
+ * find one, that's a good sign that something is seriously
+ * wrong here.
+ */
+ ASSERT(nimaps == 1 && imap.br_startoff == srcoff);
+ if (imap.br_startblock == DELAYSTARTBLOCK) {
+ ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
+ error = -EFSCORRUPTED;
+ break;
+ }
- trace_xfs_reflink_remap_imap(src, srcoff, len, XFS_DATA_FORK,
- &imap);
+ trace_xfs_reflink_remap_extent_src(src, &imap);
- /* Translate imap into the destination file. */
- range_len = imap.br_startoff + imap.br_blockcount - srcoff;
- imap.br_startoff += destoff - srcoff;
-
- /* Clear dest from destoff to the end of imap and map it in. */
- error = xfs_reflink_remap_extent(dest, &imap, destoff,
- new_isize);
+ /* Remap into the destination file at the given offset. */
+ imap.br_startoff = destoff;
+ error = xfs_reflink_remap_extent(dest, &imap, new_isize);
if (error)
break;
@@ -1173,10 +1216,10 @@
}
/* Advance drange/srange */
- srcoff += range_len;
- destoff += range_len;
- len -= range_len;
- remapped_len += range_len;
+ srcoff += imap.br_blockcount;
+ destoff += imap.br_blockcount;
+ len -= imap.br_blockcount;
+ remapped_len += imap.br_blockcount;
}
if (error)
@@ -1187,81 +1230,6 @@
}
/*
- * Grab the exclusive iolock for a data copy from src to dest, making sure to
- * abide vfs locking order (lowest pointer value goes first) and breaking the
- * layout leases before proceeding. The loop is needed because we cannot call
- * the blocking break_layout() with the iolocks held, and therefore have to
- * back out both locks.
- */
-static int
-xfs_iolock_two_inodes_and_break_layout(
- struct inode *src,
- struct inode *dest)
-{
- int error;
-
- if (src > dest)
- swap(src, dest);
-
-retry:
- /* Wait to break both inodes' layouts before we start locking. */
- error = break_layout(src, true);
- if (error)
- return error;
- if (src != dest) {
- error = break_layout(dest, true);
- if (error)
- return error;
- }
-
- /* Lock one inode and make sure nobody got in and leased it. */
- inode_lock(src);
- error = break_layout(src, false);
- if (error) {
- inode_unlock(src);
- if (error == -EWOULDBLOCK)
- goto retry;
- return error;
- }
-
- if (src == dest)
- return 0;
-
- /* Lock the other inode and make sure nobody got in and leased it. */
- inode_lock_nested(dest, I_MUTEX_NONDIR2);
- error = break_layout(dest, false);
- if (error) {
- inode_unlock(src);
- inode_unlock(dest);
- if (error == -EWOULDBLOCK)
- goto retry;
- return error;
- }
-
- return 0;
-}
-
-/* Unlock both inodes after they've been prepped for a range clone. */
-void
-xfs_reflink_remap_unlock(
- struct file *file_in,
- struct file *file_out)
-{
- 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);
- bool same_inode = (inode_in == inode_out);
-
- xfs_iunlock(dest, XFS_MMAPLOCK_EXCL);
- if (!same_inode)
- xfs_iunlock(src, XFS_MMAPLOCK_EXCL);
- inode_unlock(inode_out);
- if (!same_inode)
- inode_unlock(inode_in);
-}
-
-/*
* If we're reflinking to a point past the destination file's EOF, we must
* zero any speculative post-EOF preallocations that sit between the old EOF
* and the destination file offset.
@@ -1278,7 +1246,7 @@
trace_xfs_zero_eof(ip, isize, pos - isize);
return iomap_zero_range(VFS_I(ip), isize, pos - isize, NULL,
- &xfs_iomap_ops);
+ &xfs_buffered_write_iomap_ops);
}
/*
@@ -1323,18 +1291,12 @@
struct xfs_inode *src = XFS_I(inode_in);
struct inode *inode_out = file_inode(file_out);
struct xfs_inode *dest = XFS_I(inode_out);
- bool same_inode = (inode_in == inode_out);
- ssize_t ret;
+ int ret;
/* Lock both files against IO */
- ret = xfs_iolock_two_inodes_and_break_layout(inode_in, inode_out);
+ ret = xfs_ilock2_io_mmap(src, dest);
if (ret)
return ret;
- if (same_inode)
- xfs_ilock(src, XFS_MMAPLOCK_EXCL);
- else
- xfs_lock_two_inodes(src, XFS_MMAPLOCK_EXCL, dest,
- XFS_MMAPLOCK_EXCL);
/* Check file eligibility and prepare for block sharing. */
ret = -EINVAL;
@@ -1348,7 +1310,7 @@
ret = generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out,
len, remap_flags);
- if (ret < 0 || *len == 0)
+ if (ret || *len == 0)
goto out_unlock;
/* Attach dquots to dest inode before changing block map */
@@ -1383,91 +1345,12 @@
if (ret)
goto out_unlock;
- return 1;
+ return 0;
out_unlock:
- xfs_reflink_remap_unlock(file_in, file_out);
+ xfs_iunlock2_io_mmap(src, dest);
return ret;
}
-/*
- * The user wants to preemptively CoW all shared blocks in this file,
- * which enables us to turn off the reflink flag. Iterate all
- * extents which are not prealloc/delalloc to see which ranges are
- * mentioned in the refcount tree, then read those blocks into the
- * pagecache, dirty them, fsync them back out, and then we can update
- * the inode flag. What happens if we run out of memory? :)
- */
-STATIC int
-xfs_reflink_dirty_extents(
- struct xfs_inode *ip,
- xfs_fileoff_t fbno,
- xfs_filblks_t end,
- xfs_off_t isize)
-{
- struct xfs_mount *mp = ip->i_mount;
- xfs_agnumber_t agno;
- xfs_agblock_t agbno;
- xfs_extlen_t aglen;
- xfs_agblock_t rbno;
- xfs_extlen_t rlen;
- xfs_off_t fpos;
- xfs_off_t flen;
- struct xfs_bmbt_irec map[2];
- int nmaps;
- int error = 0;
-
- while (end - fbno > 0) {
- nmaps = 1;
- /*
- * Look for extents in the file. Skip holes, delalloc, or
- * unwritten extents; they can't be reflinked.
- */
- error = xfs_bmapi_read(ip, fbno, end - fbno, map, &nmaps, 0);
- if (error)
- goto out;
- if (nmaps == 0)
- break;
- if (!xfs_bmap_is_real_extent(&map[0]))
- goto next;
-
- map[1] = map[0];
- while (map[1].br_blockcount) {
- agno = XFS_FSB_TO_AGNO(mp, map[1].br_startblock);
- agbno = XFS_FSB_TO_AGBNO(mp, map[1].br_startblock);
- aglen = map[1].br_blockcount;
-
- error = xfs_reflink_find_shared(mp, NULL, agno, agbno,
- aglen, &rbno, &rlen, true);
- if (error)
- goto out;
- if (rbno == NULLAGBLOCK)
- break;
-
- /* Dirty the pages */
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- fpos = XFS_FSB_TO_B(mp, map[1].br_startoff +
- (rbno - agbno));
- flen = XFS_FSB_TO_B(mp, rlen);
- if (fpos + flen > isize)
- flen = isize - fpos;
- error = iomap_file_dirty(VFS_I(ip), fpos, flen,
- &xfs_iomap_ops);
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- if (error)
- goto out;
-
- map[1].br_blockcount -= (rbno - agbno + rlen);
- map[1].br_startoff += (rbno - agbno + rlen);
- map[1].br_startblock += (rbno - agbno + rlen);
- }
-
-next:
- fbno = map[0].br_startoff + map[0].br_blockcount;
- }
-out:
- return error;
-}
-
/* Does this inode need the reflink flag? */
int
xfs_reflink_inode_has_shared_extents(
@@ -1544,7 +1427,8 @@
* We didn't find any shared blocks so turn off the reflink flag.
* First, get rid of any leftover CoW mappings.
*/
- error = xfs_reflink_cancel_cow_blocks(ip, tpp, 0, NULLFILEOFF, true);
+ error = xfs_reflink_cancel_cow_blocks(ip, tpp, 0, XFS_MAX_FILEOFF,
+ true);
if (error)
return error;
@@ -1604,10 +1488,7 @@
xfs_off_t offset,
xfs_off_t len)
{
- struct xfs_mount *mp = ip->i_mount;
- xfs_fileoff_t fbno;
- xfs_filblks_t end;
- xfs_off_t isize;
+ struct inode *inode = VFS_I(ip);
int error;
if (!xfs_is_reflink_inode(ip))
@@ -1615,20 +1496,14 @@
trace_xfs_reflink_unshare(ip, offset, len);
- inode_dio_wait(VFS_I(ip));
+ inode_dio_wait(inode);
- /* Try to CoW the selected ranges */
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- fbno = XFS_B_TO_FSBT(mp, offset);
- isize = i_size_read(VFS_I(ip));
- end = XFS_B_TO_FSB(mp, offset + len);
- error = xfs_reflink_dirty_extents(ip, fbno, end, isize);
+ error = iomap_file_unshare(inode, offset, len,
+ &xfs_buffered_write_iomap_ops);
if (error)
- goto out_unlock;
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ goto out;
- /* Wait for the IO to finish */
- error = filemap_write_and_wait(VFS_I(ip)->i_mapping);
+ error = filemap_write_and_wait_range(inode->i_mapping, offset, len);
if (error)
goto out;
@@ -1636,11 +1511,8 @@
error = xfs_reflink_try_clear_inode_flag(ip);
if (error)
goto out;
-
return 0;
-out_unlock:
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
out:
trace_xfs_reflink_unshare_error(ip, error, _RET_IP_);
return error;