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authorBenjamin Marzinski <bmarzins@redhat.com>2011-04-26 01:13:24 -0500
committerSteven Whitehouse <swhiteho@redhat.com>2011-05-03 11:47:42 +0100
commit6905d9e4dda6112f007e9090bca80507da158e63 (patch)
treed0a13a80a31c18ac148f678450e045196066eb06
parentc83ae9cad8776bab153a05cc466be39f14011091 (diff)
GFS2: make sure fallocate bytes is a multiple of blksize
The GFS2 fallocate code chooses a target size to for allocating chunks of space. Whenever it can't find any resource groups with enough space free, it halves its target. Since this target is in bytes, eventually it will no longer be a multiple of blksize. As long as there is more space available in the resource group than the target, this isn't a problem, since gfs2 will use the actual space available, which is always a multiple of blksize. However, when gfs couldn't fallocate a bigger chunk than the target, it was using the non-blksize aligned number. This caused a BUG in later code that required blksize aligned offsets. GFS2 now ensures that bytes is always a multiple of blksize Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
-rw-r--r--fs/gfs2/file.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 23eab473f09d..a9f5cbe45cd9 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -816,6 +816,7 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
loff_t bytes, max_bytes;
struct gfs2_alloc *al;
int error;
+ loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
@@ -823,13 +824,15 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
if (mode & ~FALLOC_FL_KEEP_SIZE)
return -EOPNOTSUPP;
- offset = (offset >> sdp->sd_sb.sb_bsize_shift) <<
- sdp->sd_sb.sb_bsize_shift;
+ offset &= bsize_mask;
len = next - offset;
bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
if (!bytes)
bytes = UINT_MAX;
+ bytes &= bsize_mask;
+ if (bytes == 0)
+ bytes = sdp->sd_sb.sb_bsize;
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
error = gfs2_glock_nq(&ip->i_gh);
@@ -860,6 +863,9 @@ retry:
if (error) {
if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) {
bytes >>= 1;
+ bytes &= bsize_mask;
+ if (bytes == 0)
+ bytes = sdp->sd_sb.sb_bsize;
goto retry;
}
goto out_qunlock;