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| author | Christoph Hellwig <hch@lst.de> | 2009-11-21 20:28:52 +0900 |
|---|---|---|
| committer | OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> | 2009-11-21 20:36:52 +0900 |
| commit | 681142f9211b23e6aa2984259d38b76d7bdc05a8 (patch) | |
| tree | cad526094c576b74eb12b0cdb1b497bbb4765128 /fs/fat/fatent.c | |
| parent | a8a8a669ea13d792296737505adc43ccacf3a648 (diff) | |
| download | kernel_samsung_smdk4412-681142f9211b23e6aa2984259d38b76d7bdc05a8.tar.gz kernel_samsung_smdk4412-681142f9211b23e6aa2984259d38b76d7bdc05a8.tar.bz2 kernel_samsung_smdk4412-681142f9211b23e6aa2984259d38b76d7bdc05a8.zip | |
fat: make discard a mount option
Currently shipping discard capable SSDs and arrays have rather sub-optimal
implementations of the command and can the use of it can cause massive
slowdowns. Make issueing these commands option as it's already in btrfs
and gfs2.
Signed-off-by: Christoph Hellwig <hch@lst.de>
[hirofumi@mail.parknet.co.jp: tweaks, and add "discard" to fat_show_options]
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Diffstat (limited to 'fs/fat/fatent.c')
| -rw-r--r-- | fs/fat/fatent.c | 25 |
1 files changed, 15 insertions, 10 deletions
diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c index a81037721a6..81184d3b75a 100644 --- a/fs/fat/fatent.c +++ b/fs/fat/fatent.c @@ -566,16 +566,21 @@ 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; + if (sbi->options.discard) { + /* + * 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); |