Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

xfs: add repair helpers for the reverse mapping btree

Browse source 
Add a couple of functions to the reverse mapping btree that will be used
to repair the rmapbt.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2018-05-09 10:02:02 -07:00
parent 7f8f1313d9
commit 4d4f86b49f
2 changed files with 85 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

81
fs/xfs/libxfs/xfs_rmap.c
View file

@ -2032,6 +2032,34 @@ xfs_rmap_map_shared(
return error; return error;
} }
/* Insert a raw rmap into the rmapbt. */
int
xfs_rmap_map_raw(
struct xfs_btree_cur *cur,
struct xfs_rmap_irec *rmap)
{
struct xfs_owner_info oinfo;
oinfo.oi_owner = rmap->rm_owner;
oinfo.oi_offset = rmap->rm_offset;
oinfo.oi_flags = 0;
if (rmap->rm_flags & XFS_RMAP_ATTR_FORK)
oinfo.oi_flags |= XFS_OWNER_INFO_ATTR_FORK;
if (rmap->rm_flags & XFS_RMAP_BMBT_BLOCK)
oinfo.oi_flags |= XFS_OWNER_INFO_BMBT_BLOCK;
if (rmap->rm_flags || XFS_RMAP_NON_INODE_OWNER(rmap->rm_owner))
return xfs_rmap_map(cur, rmap->rm_startblock,
rmap->rm_blockcount,
rmap->rm_flags & XFS_RMAP_UNWRITTEN,
&oinfo);
return xfs_rmap_map_shared(cur, rmap->rm_startblock,
rmap->rm_blockcount,
rmap->rm_flags & XFS_RMAP_UNWRITTEN,
&oinfo);
}
struct xfs_rmap_query_range_info { struct xfs_rmap_query_range_info {
xfs_rmap_query_range_fn fn; xfs_rmap_query_range_fn fn;
void *priv; void *priv;
@ -2455,3 +2483,56 @@ xfs_rmap_record_exists(
irec.rm_startblock + irec.rm_blockcount >= bno + len); irec.rm_startblock + irec.rm_blockcount >= bno + len);
return 0; return 0;
} }
struct xfs_rmap_key_state {
uint64_t owner;
uint64_t offset;
unsigned int flags;
bool has_rmap;
};
/* For each rmap given, figure out if it doesn't match the key we want. */
STATIC int
xfs_rmap_has_other_keys_helper(
struct xfs_btree_cur *cur,
struct xfs_rmap_irec *rec,
void *priv)
{
struct xfs_rmap_key_state *rks = priv;
if (rks->owner == rec->rm_owner && rks->offset == rec->rm_offset &&
((rks->flags & rec->rm_flags) & XFS_RMAP_KEY_FLAGS) == rks->flags)
return 0;
rks->has_rmap = true;
return XFS_BTREE_QUERY_RANGE_ABORT;
}
/*
* Given an extent and some owner info, can we find records overlapping
* the extent whose owner info does not match the given owner?
*/
int
xfs_rmap_has_other_keys(
struct xfs_btree_cur *cur,
xfs_agblock_t bno,
xfs_extlen_t len,
struct xfs_owner_info *oinfo,
bool *has_rmap)
{
struct xfs_rmap_irec low = {0};
struct xfs_rmap_irec high;
struct xfs_rmap_key_state rks;
int error;
xfs_owner_info_unpack(oinfo, &rks.owner, &rks.offset, &rks.flags);
rks.has_rmap = false;
low.rm_startblock = bno;
memset(&high, 0xFF, sizeof(high));
high.rm_startblock = bno + len - 1;
error = xfs_rmap_query_range(cur, &low, &high,
xfs_rmap_has_other_keys_helper, &rks);
*has_rmap = rks.has_rmap;
return error;
}

4
fs/xfs/libxfs/xfs_rmap.h
View file

@ -238,5 +238,9 @@ int xfs_rmap_has_record(struct xfs_btree_cur *cur, xfs_agblock_t bno,
int xfs_rmap_record_exists(struct xfs_btree_cur *cur, xfs_agblock_t bno, int xfs_rmap_record_exists(struct xfs_btree_cur *cur, xfs_agblock_t bno,
xfs_extlen_t len, struct xfs_owner_info *oinfo, xfs_extlen_t len, struct xfs_owner_info *oinfo,
bool *has_rmap); bool *has_rmap);
int xfs_rmap_has_other_keys(struct xfs_btree_cur *cur, xfs_agblock_t bno,
xfs_extlen_t len, struct xfs_owner_info *oinfo,
bool *has_rmap);
int xfs_rmap_map_raw(struct xfs_btree_cur *cur, struct xfs_rmap_irec *rmap);
#endif /* __XFS_RMAP_H__ */ #endif /* __XFS_RMAP_H__ */