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authorLukas Czerner <lczerner@redhat.com>2012-10-16 11:38:06 +0200
committerDave Kleikamp <dave.kleikamp@oracle.com>2012-10-17 09:18:38 -0500
commit4e7a4b01222343481d8ff084dbef9b80f7089a19 (patch)
tree94f8cb9fdc9053fc7d310708d036461232d5a2ee
parent8d2b6b3ae280dcf6f6c7a95623670a57cdf562ed (diff)
downloadop-kernel-dev-4e7a4b01222343481d8ff084dbef9b80f7089a19.zip
op-kernel-dev-4e7a4b01222343481d8ff084dbef9b80f7089a19.tar.gz
jfs: Fix FITRIM argument handling
Currently when 'range->start' is beyond the end of file system nothing is done and that fact is ignored, where in fact we should return EINVAL. The same problem is when 'range.len' is smaller than file system block. Fix this by adding check for such conditions and return EINVAL appropriately. Signed-off-by: Lukas Czerner <lczerner@redhat.com> Acked-by: Tino Reichardt <milky-kernel@mcmilk.de> Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
-rw-r--r--fs/jfs/jfs_discard.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/fs/jfs/jfs_discard.c b/fs/jfs/jfs_discard.c
index 9947563..dfcd503 100644
--- a/fs/jfs/jfs_discard.c
+++ b/fs/jfs/jfs_discard.c
@@ -83,7 +83,7 @@ int jfs_ioc_trim(struct inode *ip, struct fstrim_range *range)
struct bmap *bmp = JFS_SBI(ip->i_sb)->bmap;
struct super_block *sb = ipbmap->i_sb;
int agno, agno_end;
- s64 start, end, minlen;
+ u64 start, end, minlen;
u64 trimmed = 0;
/**
@@ -93,15 +93,19 @@ int jfs_ioc_trim(struct inode *ip, struct fstrim_range *range)
* minlen: minimum extent length in Bytes
*/
start = range->start >> sb->s_blocksize_bits;
- if (start < 0)
- start = 0;
end = start + (range->len >> sb->s_blocksize_bits) - 1;
- if (end >= bmp->db_mapsize)
- end = bmp->db_mapsize - 1;
minlen = range->minlen >> sb->s_blocksize_bits;
- if (minlen <= 0)
+ if (minlen == 0)
minlen = 1;
+ if (minlen > bmp->db_agsize ||
+ start >= bmp->db_mapsize ||
+ range->len < sb->s_blocksize)
+ return -EINVAL;
+
+ if (end >= bmp->db_mapsize)
+ end = bmp->db_mapsize - 1;
+
/**
* we trim all ag's within the range
*/
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