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| author | Andreas Gruenbacher <agruenba@redhat.com> | 2018-11-08 23:14:29 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-11-21 11:22:10 +0300 |
| commit | 08f382aeba0c7f33a4db60608482192feb55ccaa (patch) | |
| tree | 5b6355a19b8e9e097496852a3203d2e35c4d664d | |
| parent | 47e7c3fc9b8bfc2c7048cb913e78f1935c519652 (diff) | |
| download | linux-08f382aeba0c7f33a4db60608482192feb55ccaa.tar.xz | |
gfs2: Fix metadata read-ahead during truncate (2)
commit e7445ceddfc220c1aede6d42758a5acb8844e9c3 upstream.
The previous attempt to fix for metadata read-ahead during truncate was
incorrect: for files with a height > 2 (1006989312 bytes with a block
size of 4096 bytes), read-ahead requests were not being issued for some
of the indirect blocks discovered while walking the metadata tree,
leading to significant slow-downs when deleting large files. Fix that.
In addition, only issue read-ahead requests in the first pass through
the meta-data tree, while deallocating data blocks.
Fixes: c3ce5aa9b0 ("gfs2: Fix metadata read-ahead during truncate")
Cc: stable@vger.kernel.org # v4.16+
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/gfs2/bmap.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c index fd5bea55fd60..9c418249734d 100644 --- a/fs/gfs2/bmap.c +++ b/fs/gfs2/bmap.c @@ -1652,10 +1652,16 @@ static int punch_hole(struct gfs2_inode *ip, u64 offset, u64 length) if (ret < 0) goto out; - /* issue read-ahead on metadata */ - if (mp.mp_aheight > 1) { - for (; ret > 1; ret--) { - metapointer_range(&mp, mp.mp_aheight - ret, + /* On the first pass, issue read-ahead on metadata. */ + if (mp.mp_aheight > 1 && strip_h == ip->i_height - 1) { + unsigned int height = mp.mp_aheight - 1; + + /* No read-ahead for data blocks. */ + if (mp.mp_aheight - 1 == strip_h) + height--; + + for (; height >= mp.mp_aheight - ret; height--) { + metapointer_range(&mp, height, start_list, start_aligned, end_list, end_aligned, &start, &end); |