Commit e80de36d authored by Tao Ma's avatar Tao Ma Committed by Joel Becker

ocfs2: Add ocfs2_trim_fs for SSD trim support.

Add ocfs2_trim_fs to support trimming freed clusters in the
volume. A range will be given and all the freed clusters greater
than minlen will be discarded to the block layer.
Signed-off-by: default avatarTao Ma <boyu.mt@taobao.com>
Signed-off-by: default avatarJoel Becker <jlbec@evilplan.org>
parent 69a60c4d
...@@ -29,6 +29,7 @@ ...@@ -29,6 +29,7 @@
#include <linux/highmem.h> #include <linux/highmem.h>
#include <linux/swap.h> #include <linux/swap.h>
#include <linux/quotaops.h> #include <linux/quotaops.h>
#include <linux/blkdev.h>
#include <cluster/masklog.h> #include <cluster/masklog.h>
...@@ -7184,3 +7185,161 @@ int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh, ...@@ -7184,3 +7185,161 @@ int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh,
out: out:
return ret; return ret;
} }
static int ocfs2_trim_extent(struct super_block *sb,
struct ocfs2_group_desc *gd,
u32 start, u32 count)
{
u64 discard, bcount;
bcount = ocfs2_clusters_to_blocks(sb, count);
discard = le64_to_cpu(gd->bg_blkno) +
ocfs2_clusters_to_blocks(sb, start);
return sb_issue_discard(sb, discard, bcount, GFP_NOFS, 0);
}
static int ocfs2_trim_group(struct super_block *sb,
struct ocfs2_group_desc *gd,
u32 start, u32 max, u32 minbits)
{
int ret = 0, count = 0, next;
void *bitmap = gd->bg_bitmap;
if (le16_to_cpu(gd->bg_free_bits_count) < minbits)
return 0;
while (start < max) {
start = ocfs2_find_next_zero_bit(bitmap, max, start);
if (start >= max)
break;
next = ocfs2_find_next_bit(bitmap, max, start);
if ((next - start) >= minbits) {
ret = ocfs2_trim_extent(sb, gd,
start, next - start);
if (ret < 0) {
mlog_errno(ret);
break;
}
count += next - start;
}
start = next + 1;
if (fatal_signal_pending(current)) {
count = -ERESTARTSYS;
break;
}
if ((le16_to_cpu(gd->bg_free_bits_count) - count) < minbits)
break;
}
if (ret < 0)
count = ret;
return count;
}
int ocfs2_trim_fs(struct super_block *sb, struct fstrim_range *range)
{
struct ocfs2_super *osb = OCFS2_SB(sb);
u64 start, len, trimmed, first_group, last_group, group;
int ret, cnt;
u32 first_bit, last_bit, minlen;
struct buffer_head *main_bm_bh = NULL;
struct inode *main_bm_inode = NULL;
struct buffer_head *gd_bh = NULL;
struct ocfs2_dinode *main_bm;
struct ocfs2_group_desc *gd = NULL;
start = range->start >> osb->s_clustersize_bits;
len = range->len >> osb->s_clustersize_bits;
minlen = range->minlen >> osb->s_clustersize_bits;
trimmed = 0;
if (!len) {
range->len = 0;
return 0;
}
if (minlen >= osb->bitmap_cpg)
return -EINVAL;
main_bm_inode = ocfs2_get_system_file_inode(osb,
GLOBAL_BITMAP_SYSTEM_INODE,
OCFS2_INVALID_SLOT);
if (!main_bm_inode) {
ret = -EIO;
mlog_errno(ret);
goto out;
}
mutex_lock(&main_bm_inode->i_mutex);
ret = ocfs2_inode_lock(main_bm_inode, &main_bm_bh, 0);
if (ret < 0) {
mlog_errno(ret);
goto out_mutex;
}
main_bm = (struct ocfs2_dinode *)main_bm_bh->b_data;
if (start >= le32_to_cpu(main_bm->i_clusters)) {
ret = -EINVAL;
goto out_unlock;
}
if (start + len > le32_to_cpu(main_bm->i_clusters))
len = le32_to_cpu(main_bm->i_clusters) - start;
/* Determine first and last group to examine based on start and len */
first_group = ocfs2_which_cluster_group(main_bm_inode, start);
if (first_group == osb->first_cluster_group_blkno)
first_bit = start;
else
first_bit = start - ocfs2_blocks_to_clusters(sb, first_group);
last_group = ocfs2_which_cluster_group(main_bm_inode, start + len - 1);
last_bit = osb->bitmap_cpg;
for (group = first_group; group <= last_group;) {
if (first_bit + len >= osb->bitmap_cpg)
last_bit = osb->bitmap_cpg;
else
last_bit = first_bit + len;
ret = ocfs2_read_group_descriptor(main_bm_inode,
main_bm, group,
&gd_bh);
if (ret < 0) {
mlog_errno(ret);
break;
}
gd = (struct ocfs2_group_desc *)gd_bh->b_data;
cnt = ocfs2_trim_group(sb, gd, first_bit, last_bit, minlen);
brelse(gd_bh);
gd_bh = NULL;
if (cnt < 0) {
ret = cnt;
mlog_errno(ret);
break;
}
trimmed += cnt;
len -= osb->bitmap_cpg - first_bit;
first_bit = 0;
if (group == osb->first_cluster_group_blkno)
group = ocfs2_clusters_to_blocks(sb, osb->bitmap_cpg);
else
group += ocfs2_clusters_to_blocks(sb, osb->bitmap_cpg);
}
range->len = trimmed * sb->s_blocksize;
out_unlock:
ocfs2_inode_unlock(main_bm_inode, 0);
brelse(main_bm_bh);
out_mutex:
mutex_unlock(&main_bm_inode->i_mutex);
iput(main_bm_inode);
out:
return ret;
}
...@@ -239,6 +239,7 @@ int ocfs2_find_leaf(struct ocfs2_caching_info *ci, ...@@ -239,6 +239,7 @@ int ocfs2_find_leaf(struct ocfs2_caching_info *ci,
struct buffer_head **leaf_bh); struct buffer_head **leaf_bh);
int ocfs2_search_extent_list(struct ocfs2_extent_list *el, u32 v_cluster); int ocfs2_search_extent_list(struct ocfs2_extent_list *el, u32 v_cluster);
int ocfs2_trim_fs(struct super_block *sb, struct fstrim_range *range);
/* /*
* Helper function to look at the # of clusters in an extent record. * Helper function to look at the # of clusters in an extent record.
*/ */
......
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