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xfs: enable realtime reflink

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Enable reflink for realtime devices, as long as the realtime allocation
unit is a single fsblock.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2024-11-20 16:21:17 -08:00
parent fd97fe1112
commit 155debbe7e
4 changed files with 36 additions and 4 deletions
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25
fs/xfs/xfs_reflink.c
View File

@ -1822,3 +1822,28 @@ out:
trace_xfs_reflink_unshare_error(ip, error, _RET_IP_);
return error;
}
/*
* Can we use reflink with this realtime extent size? Note that we don't check
* for rblocks > 0 here because this can be called as part of attaching a new
* rt section.
*/
bool
xfs_reflink_supports_rextsize(
struct xfs_mount *mp,
unsigned int rextsize)
{
/* reflink on the realtime device requires rtgroups */
if (!xfs_has_rtgroups(mp))
return false;
/*
* Reflink doesn't support rt extent size larger than a single fsblock
* because we would have to perform CoW-around for unaligned write
* requests to guarantee that we always remap entire rt extents.
*/
if (rextsize != 1)
return false;
return true;
}

2
fs/xfs/xfs_reflink.h
View File

@ -62,4 +62,6 @@ extern int xfs_reflink_remap_blocks(struct xfs_inode *src, loff_t pos_in,
extern int xfs_reflink_update_dest(struct xfs_inode *dest, xfs_off_t newlen,
xfs_extlen_t cowextsize, unsigned int remap_flags);
bool xfs_reflink_supports_rextsize(struct xfs_mount *mp, unsigned int rextsize);
#endif /* __XFS_REFLINK_H */

7
fs/xfs/xfs_rtalloc.c
View File

@ -32,6 +32,7 @@
#include "xfs_error.h"
#include "xfs_trace.h"
#include "xfs_rtrefcount_btree.h"
#include "xfs_reflink.h"
/*
* Return whether there are any free extents in the size range given
@ -1292,8 +1293,10 @@ xfs_growfs_rt(
goto out_unlock;
if (xfs_has_quota(mp))
goto out_unlock;
}
if (xfs_has_reflink(mp))
if (xfs_has_reflink(mp))
goto out_unlock;
} else if (xfs_has_reflink(mp) &&
!xfs_reflink_supports_rextsize(mp, in->extsize))
goto out_unlock;
error = xfs_sb_validate_fsb_count(&mp->m_sb, in->newblocks);

6
fs/xfs/xfs_super.c
View File

@ -1754,9 +1754,11 @@ xfs_fs_fill_super(
xfs_warn_experimental(mp, XFS_EXPERIMENTAL_METADIR);
if (xfs_has_reflink(mp)) {
if (mp->m_sb.sb_rblocks) {
if (xfs_has_realtime(mp) &&
!xfs_reflink_supports_rextsize(mp, mp->m_sb.sb_rextsize)) {
xfs_alert(mp,
"reflink not compatible with realtime device!");
"reflink not compatible with realtime extent size %u!",
mp->m_sb.sb_rextsize);
error = -EINVAL;
goto out_filestream_unmount;
}