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xfs: factor out a xfs_zoned_fill_srcmap helper

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The code filling the srcmap in xfs_zoned_buffered_write_iomap_begin isn't
terribly complicated, but fairly deeply indented and will become a bit
more complex soon.  Factor it into a helper and add some comments.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
This commit is contained in:
Christoph Hellwig 2026-09-24 11:57:09 +02:00 committed by Carlos Maiolino
parent 0c94f5499d
commit b74d34fa3c
1 changed files with 35 additions and 18 deletions
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53
fs/xfs/xfs_iomap.c
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@ -1588,6 +1588,37 @@ xfs_bmapi_reserve_delalloc(
return error;
}
static int
xfs_zoned_fill_srcmap(
struct xfs_inode *ip,
xfs_fileoff_t offset_fsb,
xfs_fileoff_t *end_fsb,
unsigned flags,
struct iomap *srcmap)
{
struct xfs_bmbt_irec smap;
struct xfs_iext_cursor scur;
if (!xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &scur, &smap))
smap.br_startoff = *end_fsb; /* fake hole until EOF */
if (smap.br_startoff > offset_fsb) {
/*
* There is a hole at @offset_fsb. Only map until the end of
* the of it.
*/
*end_fsb = min(*end_fsb, smap.br_startoff);
return 0;
}
/*
* There is a data fork mapping, only map until the end of it.
*/
*end_fsb = min(*end_fsb, smap.br_startoff + smap.br_blockcount);
xfs_trim_extent(&smap, offset_fsb, *end_fsb - offset_fsb);
return xfs_bmbt_to_iomap(ip, srcmap, &smap, flags, 0,
xfs_iomap_inode_sequence(ip, 0));
}
static int
xfs_zoned_buffered_write_iomap_begin(
struct inode *inode,
@ -1655,24 +1686,10 @@ xfs_zoned_buffered_write_iomap_begin(
if (!IS_ALIGNED(offset, mp->m_sb.sb_blocksize) ||
!IS_ALIGNED(offset + count, mp->m_sb.sb_blocksize) ||
(flags & IOMAP_ZERO)) {
struct xfs_bmbt_irec smap;
struct xfs_iext_cursor scur;
if (!xfs_iext_lookup_extent(ip, &ip->i_df, offset_fsb, &scur,
&smap))
smap.br_startoff = end_fsb; /* fake hole until EOF */
if (smap.br_startoff > offset_fsb) {
end_fsb = min(end_fsb, smap.br_startoff);
} else {
end_fsb = min(end_fsb,
smap.br_startoff + smap.br_blockcount);
xfs_trim_extent(&smap, offset_fsb,
end_fsb - offset_fsb);
error = xfs_bmbt_to_iomap(ip, srcmap, &smap, flags, 0,
xfs_iomap_inode_sequence(ip, 0));
if (error)
goto out_unlock;
}
error = xfs_zoned_fill_srcmap(ip, offset_fsb, &end_fsb, flags,
srcmap);
if (error)
goto out_unlock;
}
if (!ip->i_cowfp)