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authorAbhijith Das <adas@redhat.com>2013-06-19 17:03:29 -0400
committerSteven Whitehouse <swhiteho@redhat.com>2013-06-19 21:41:26 +0100
commit6a98c333edd0ada67e96a5dbd0445808147833f7 (patch)
tree817ef5b7e107537c39bd02b872945aca20863c38
parent2b12eea656765b1392b55f0e5cae48be09ed9344 (diff)
GFS2: Fix fstrim boundary conditions
This patch correctly distinguishes two boundary conditions: 1. When the given range is entire within the unaccounted space between two rgrps, and 2. The range begins beyond the end of the filesystem Also fix the unit of the returned value r.len (total trimming) to be in bytes instead of the (incorrect) 512 byte blocks With this patch, GFS2 passes multiple iterations of all the relevant xfstests (251, 260, 288) with different fs block sizes. Signed-off-by: Abhi Das <adas@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
-rw-r--r--fs/gfs2/rgrp.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 9809156e3d04..69317435faa7 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -1288,13 +1288,15 @@ int gfs2_fitrim(struct file *filp, void __user *argp)
minlen = max_t(u64, r.minlen,
q->limits.discard_granularity) >> bs_shift;
+ if (end <= start || minlen > sdp->sd_max_rg_data)
+ return -EINVAL;
+
rgd = gfs2_blk2rgrpd(sdp, start, 0);
- rgd_end = gfs2_blk2rgrpd(sdp, end - 1, 0);
+ rgd_end = gfs2_blk2rgrpd(sdp, end, 0);
- if (end <= start ||
- minlen > sdp->sd_max_rg_data ||
- start > rgd_end->rd_data0 + rgd_end->rd_data)
- return -EINVAL;
+ if ((gfs2_rgrpd_get_first(sdp) == gfs2_rgrpd_get_next(rgd_end))
+ && (start > rgd_end->rd_data0 + rgd_end->rd_data))
+ return -EINVAL; /* start is beyond the end of the fs */
while (1) {
@@ -1336,7 +1338,7 @@ int gfs2_fitrim(struct file *filp, void __user *argp)
}
out:
- r.len = trimmed << 9;
+ r.len = trimmed << bs_shift;
if (copy_to_user(argp, &r, sizeof(r)))
return -EFAULT;