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xfs: avoid shared rmap operations for attr fork extents 

During code review, I noticed that the rmap code uses the (slower)
shared mappings rmap functions for any extent of a reflinked file, even
if those extents are for the attr fork, which doesn't support sharing.
We can speed up rmap a tiny bit by optimizing out this case.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2020-09-24 09:42:55 -07:00
parent b38e07401e
commit d7884e6e90
1 changed files with 18 additions and 9 deletions
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27
fs/xfs/libxfs/xfs_rmap.c
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@ -2505,12 +2505,15 @@ xfs_rmap_map_extent(
int whichfork,
struct xfs_bmbt_irec *PREV)
{
enum xfs_rmap_intent_type type = XFS_RMAP_MAP;
if (!xfs_rmap_update_is_needed(tp->t_mountp, whichfork))
return;
__xfs_rmap_add(tp, xfs_is_reflink_inode(ip) ?
XFS_RMAP_MAP_SHARED : XFS_RMAP_MAP, ip->i_ino,
whichfork, PREV);
if (whichfork != XFS_ATTR_FORK && xfs_is_reflink_inode(ip))
type = XFS_RMAP_MAP_SHARED;
__xfs_rmap_add(tp, type, ip->i_ino, whichfork, PREV);
}
/* Unmap an extent out of a file. */
@ -2521,12 +2524,15 @@ xfs_rmap_unmap_extent(
int whichfork,
struct xfs_bmbt_irec *PREV)
{
enum xfs_rmap_intent_type type = XFS_RMAP_UNMAP;
if (!xfs_rmap_update_is_needed(tp->t_mountp, whichfork))
return;
__xfs_rmap_add(tp, xfs_is_reflink_inode(ip) ?
XFS_RMAP_UNMAP_SHARED : XFS_RMAP_UNMAP, ip->i_ino,
whichfork, PREV);
if (whichfork != XFS_ATTR_FORK && xfs_is_reflink_inode(ip))
type = XFS_RMAP_UNMAP_SHARED;
__xfs_rmap_add(tp, type, ip->i_ino, whichfork, PREV);
}
/*
@ -2543,12 +2549,15 @@ xfs_rmap_convert_extent(
int whichfork,
struct xfs_bmbt_irec *PREV)
{
enum xfs_rmap_intent_type type = XFS_RMAP_CONVERT;
if (!xfs_rmap_update_is_needed(mp, whichfork))
return;
__xfs_rmap_add(tp, xfs_is_reflink_inode(ip) ?
XFS_RMAP_CONVERT_SHARED : XFS_RMAP_CONVERT, ip->i_ino,
whichfork, PREV);
if (whichfork != XFS_ATTR_FORK && xfs_is_reflink_inode(ip))
type = XFS_RMAP_CONVERT_SHARED;
__xfs_rmap_add(tp, type, ip->i_ino, whichfork, PREV);
}
/* Schedule the creation of an rmap for non-file data. */