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xfs: refactor attr scrub memory allocation function

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Move the code that allocates memory buffers for the extended attribute
scrub code into a separate function so we can reduce memory allocations
in the next patch.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong 2019-07-05 10:29:55 -07:00
parent 3addd24880
commit 0081675933
2 changed files with 29 additions and 12 deletions
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39
fs/xfs/scrub/attr.c
View file

@ -20,25 +20,40 @@
#include "scrub/dabtree.h"
#include "scrub/attr.h"
/* Allocate enough memory to hold an attr value and attr block bitmaps. */
int
xchk_setup_xattr_buf(
struct xfs_scrub *sc,
size_t value_size)
{
size_t sz;
/*
* We need enough space to read an xattr value from the file or enough
* space to hold three copies of the xattr free space bitmap. We don't
* need the buffer space for both purposes at the same time.
*/
sz = 3 * sizeof(long) * BITS_TO_LONGS(sc->mp->m_attr_geo->blksize);
sz = max_t(size_t, sz, value_size);
sc->buf = kmem_zalloc_large(sz, KM_SLEEP);
if (!sc->buf)
return -ENOMEM;
return 0;
}
/* Set us up to scrub an inode's extended attributes. */
int
xchk_setup_xattr(
struct xfs_scrub *sc,
struct xfs_inode *ip)
{
size_t sz;
int error;
/*
* Allocate the buffer without the inode lock held. We need enough
* space to read every xattr value in the file or enough space to
* hold three copies of the xattr free space bitmap. (Not both at
* the same time.)
*/
sz = max_t(size_t, XATTR_SIZE_MAX, 3 * sizeof(long) *
BITS_TO_LONGS(sc->mp->m_attr_geo->blksize));
sc->buf = kmem_zalloc_large(sz, KM_SLEEP);
if (!sc->buf)
return -ENOMEM;
error = xchk_setup_xattr_buf(sc, XATTR_SIZE_MAX);
if (error)
return error;
return xchk_setup_inode_contents(sc, ip, 0);
}

2
fs/xfs/scrub/attr.h
View file

@ -62,4 +62,6 @@ xchk_xattr_dstmap(
BITS_TO_LONGS(sc->mp->m_attr_geo->blksize);
}
int xchk_setup_xattr_buf(struct xfs_scrub *sc, size_t value_size);
#endif /* __XFS_SCRUB_ATTR_H__ */