diff options
author | Darrick J. Wong <darrick.wong@oracle.com> | 2017-03-29 00:56:36 +0300 |
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committer | Darrick J. Wong <darrick.wong@oracle.com> | 2017-04-04 01:18:17 +0300 |
commit | fb3c3de2f65c007f3ee50538ea131f5c4603c7bc (patch) | |
tree | 521081abafe35299f246d9a9498f32a6ee78a43d /fs/xfs/libxfs | |
parent | e9a2599a249ed7d31771985aea0e761f5680de64 (diff) | |
download | linux-fb3c3de2f65c007f3ee50538ea131f5c4603c7bc.tar.xz |
xfs: add a couple of queries to iterate free extents in the rtbitmap
Add _query_range and _query_all functions to the realtime bitmap
allocator. These two functions are similar in usage to the btree
functions with the same name and will be used for getfsmap and scrub.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Diffstat (limited to 'fs/xfs/libxfs')
-rw-r--r-- | fs/xfs/libxfs/xfs_rtbitmap.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_rtbitmap.c b/fs/xfs/libxfs/xfs_rtbitmap.c index ea45584a9913..e47b99e59f60 100644 --- a/fs/xfs/libxfs/xfs_rtbitmap.c +++ b/fs/xfs/libxfs/xfs_rtbitmap.c @@ -1016,3 +1016,73 @@ xfs_rtfree_extent( } return 0; } + +/* Find all the free records within a given range. */ +int +xfs_rtalloc_query_range( + struct xfs_trans *tp, + struct xfs_rtalloc_rec *low_rec, + struct xfs_rtalloc_rec *high_rec, + xfs_rtalloc_query_range_fn fn, + void *priv) +{ + struct xfs_rtalloc_rec rec; + struct xfs_mount *mp = tp->t_mountp; + xfs_rtblock_t rtstart; + xfs_rtblock_t rtend; + xfs_rtblock_t rem; + int is_free; + int error = 0; + + if (low_rec->ar_startblock > high_rec->ar_startblock) + return -EINVAL; + else if (low_rec->ar_startblock == high_rec->ar_startblock) + return 0; + + /* Iterate the bitmap, looking for discrepancies. */ + rtstart = low_rec->ar_startblock; + rem = high_rec->ar_startblock - rtstart; + while (rem) { + /* Is the first block free? */ + error = xfs_rtcheck_range(mp, tp, rtstart, 1, 1, &rtend, + &is_free); + if (error) + break; + + /* How long does the extent go for? */ + error = xfs_rtfind_forw(mp, tp, rtstart, + high_rec->ar_startblock - 1, &rtend); + if (error) + break; + + if (is_free) { + rec.ar_startblock = rtstart; + rec.ar_blockcount = rtend - rtstart + 1; + + error = fn(tp, &rec, priv); + if (error) + break; + } + + rem -= rtend - rtstart + 1; + rtstart = rtend + 1; + } + + return error; +} + +/* Find all the free records. */ +int +xfs_rtalloc_query_all( + struct xfs_trans *tp, + xfs_rtalloc_query_range_fn fn, + void *priv) +{ + struct xfs_rtalloc_rec keys[2]; + + keys[0].ar_startblock = 0; + keys[1].ar_startblock = tp->t_mountp->m_sb.sb_rblocks; + keys[0].ar_blockcount = keys[1].ar_blockcount = 0; + + return xfs_rtalloc_query_range(tp, &keys[0], &keys[1], fn, priv); +} |