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authorTao Ma <tao.ma@oracle.com>2010-06-09 16:43:05 +0800
committerJoel Becker <joel.becker@oracle.com>2010-06-15 16:50:43 -0700
commit1739da40543ed2129050ccfa8a076a851ab6ed00 (patch)
tree43c58012649437dba6383411eb50c2031ad42050 /fs/ocfs2/localalloc.c
parent40f165f416bde747d85cdf71bc9dde700912f71f (diff)
ocfs2: Limit default local alloc size within bitmap range.
In commit 6b82021b9e91cd689fdffadbcdb9a42597bbe764, we increase our local alloc size and calculate how much megabytes we can get according to group size and volume size. But we also need to check the maximum bits a local alloc block bitmap can have. With a bs=512, cs=32K, local volume with 160G, it calculate 96MB while the maximum local alloc size is only 76M. So the bitmap will overflow and corrupt the system truncate log file. See bug http://oss.oracle.com/bugzilla/show_bug.cgi?id=1262 Signed-off-by: Tao Ma <tao.ma@oracle.com> Acked-by: Mark Fasheh <mfasheh@suse.com> Signed-off-by: Joel Becker <joel.becker@oracle.com>
Diffstat (limited to 'fs/ocfs2/localalloc.c')
-rw-r--r--fs/ocfs2/localalloc.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c
index 3d7419682dc0..ec6adbf8f551 100644
--- a/fs/ocfs2/localalloc.c
+++ b/fs/ocfs2/localalloc.c
@@ -118,6 +118,7 @@ unsigned int ocfs2_la_default_mb(struct ocfs2_super *osb)
{
unsigned int la_mb;
unsigned int gd_mb;
+ unsigned int la_max_mb;
unsigned int megs_per_slot;
struct super_block *sb = osb->sb;
@@ -182,6 +183,12 @@ unsigned int ocfs2_la_default_mb(struct ocfs2_super *osb)
if (megs_per_slot < la_mb)
la_mb = megs_per_slot;
+ /* We can't store more bits than we can in a block. */
+ la_max_mb = ocfs2_clusters_to_megabytes(osb->sb,
+ ocfs2_local_alloc_size(sb) * 8);
+ if (la_mb > la_max_mb)
+ la_mb = la_max_mb;
+
return la_mb;
}