github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-27 00:22:00 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

xfs: fill dirty folios on zero range of unwritten mappings

Browse Source 
Use the iomap folio batch mechanism to select folios to zero on zero
range of unwritten mappings. Trim the resulting mapping if the batch
is filled (unlikely for current use cases) to distinguish between a
range to skip and one that requires another iteration due to a full
batch.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Brian Foster 2025-10-03 09:46:39 -04:00 committed by Christian Brauner
parent 5c13dde963
commit 77c475692c
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 23 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
fs/xfs/xfs_iomap.c
View File

@ -1702,6 +1702,8 @@ xfs_buffered_write_iomap_begin(
struct iomap *iomap,
struct iomap *srcmap)
{
struct iomap_iter *iter = container_of(iomap, struct iomap_iter,
iomap);
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);
@ -1773,6 +1775,7 @@ xfs_buffered_write_iomap_begin(
*/
if (flags & IOMAP_ZERO) {
xfs_fileoff_t eof_fsb = XFS_B_TO_FSB(mp, XFS_ISIZE(ip));
u64 end;
if (isnullstartblock(imap.br_startblock) &&
offset_fsb >= eof_fsb)
@ -1780,6 +1783,26 @@ xfs_buffered_write_iomap_begin(
if (offset_fsb < eof_fsb && end_fsb > eof_fsb)
end_fsb = eof_fsb;
/*
* Look up dirty folios for unwritten mappings within EOF.
* Providing this bypasses the flush iomap uses to trigger
* extent conversion when unwritten mappings have dirty
* pagecache in need of zeroing.
*
* Trim the mapping to the end pos of the lookup, which in turn
* was trimmed to the end of the batch if it became full before
* the end of the mapping.
*/
if (imap.br_state == XFS_EXT_UNWRITTEN &&
offset_fsb < eof_fsb) {
loff_t len = min(count,
XFS_FSB_TO_B(mp, imap.br_blockcount));
end = iomap_fill_dirty_folios(iter, offset, len);
end_fsb = min_t(xfs_fileoff_t, end_fsb,
XFS_B_TO_FSB(mp, end));
}
xfs_trim_extent(&imap, offset_fsb, end_fsb - offset_fsb);
}