From e804ff107806d691c7aae6d94a4c64abd53ca05d Mon Sep 17 00:00:00 2001 From: Benjamin Marzinski Date: Tue, 26 Apr 2011 01:13:24 -0500 Subject: [PATCH] GFS2: make sure fallocate bytes is a multiple of blksize commit 6905d9e4dda6112f007e9090bca80507da158e63 upstream. 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 Signed-off-by: Steven Whitehouse Signed-off-by: Greg Kroah-Hartman --- fs/gfs2/file.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c index e48310885c48..418728f4db02 100644 --- a/fs/gfs2/file.c +++ b/fs/gfs2/file.c @@ -826,6 +826,7 @@ 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; @@ -833,13 +834,15 @@ 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); @@ -870,6 +873,9 @@ 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; -- 2.39.5