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Let the block device know when sectors can be discarded

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[hirofumi@mail.parknet.co.jp: discard _after_ checking for corrupt chains]

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
David Woodhouse 2008-08-05 18:05:46 +01:00 committed by Jens Axboe
parent fb2dce862d
commit 8c540a96c1
1 changed files with 14 additions and 0 deletions
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14
fs/fat/fatent.c
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@ -6,6 +6,7 @@
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/msdos_fs.h>
#include <linux/blkdev.h>
struct fatent_operations {
void (*ent_blocknr)(struct super_block *, int, int *, sector_t *);
@ -535,6 +536,7 @@ int fat_free_clusters(struct inode *inode, int cluster)
struct fat_entry fatent;
struct buffer_head *bhs[MAX_BUF_PER_PAGE];
int i, err, nr_bhs;
int first_cl = cluster;
nr_bhs = 0;
fatent_init(&fatent);
@ -551,6 +553,18 @@ int fat_free_clusters(struct inode *inode, int cluster)
goto error;
}
/*
* Issue discard for the sectors we no longer care about,
* batching contiguous clusters into one request
*/
if (cluster != fatent.entry + 1) {
int nr_clus = fatent.entry - first_cl + 1;
sb_issue_discard(sb, fat_clus_to_blknr(sbi, first_cl),
nr_clus * sbi->sec_per_clus);
first_cl = cluster;
}
ops->ent_put(&fatent, FAT_ENT_FREE);
if (sbi->free_clusters != -1) {
sbi->free_clusters++;