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jfs: Fix do_div precision in commit b40c2e66 

In a hasty fix to replace a 64-bit division with do_div, I
unintentionally assigned the divisor to a 32-bit variable.

Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Cc: Tino Reichardt <milky-kernel@mcmilk.de>
This commit is contained in:
Dave Kleikamp 2012-09-18 11:27:22 -05:00
parent 550d6da288
commit 84f4141ee3
1 changed files with 4 additions and 3 deletions
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7
fs/jfs/jfs_dmap.c
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@ -1641,14 +1641,15 @@ s64 dbDiscardAG(struct inode *ip, int agno, s64 minlen)
/* max blkno / nblocks pairs to trim */
int count = 0, range_cnt;
u64 max_ranges;
/* prevent others from writing new stuff here, while trimming */
IWRITE_LOCK(ipbmap, RDWRLOCK_DMAP);
nblocks = bmp->db_agfree[agno];
range_cnt = nblocks;
do_div(range_cnt, (int)minlen);
range_cnt = min(range_cnt + 1, 32 * 1024);
max_ranges = nblocks;
do_div(max_ranges, minlen);
range_cnt = min_t(u64, max_ranges + 1, 32 * 1024);
totrim = kmalloc(sizeof(struct range2trim) * range_cnt, GFP_NOFS);
if (totrim == NULL) {
jfs_error(bmp->db_ipbmap->i_sb,