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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>
This commit is contained in:
Lukas Czerner 2012-10-16 11:38:06 +02:00 committed by Dave Kleikamp
parent 8d2b6b3ae2
commit 4e7a4b0122
1 changed files with 10 additions and 6 deletions
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16
fs/jfs/jfs_discard.c
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@ -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;
/**
@ -93,14 +93,18 @@ 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;
minlen = range->minlen >> sb->s_blocksize_bits;
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;
minlen = range->minlen >> sb->s_blocksize_bits;
if (minlen <= 0)
minlen = 1;
/**
* we trim all ag's within the range