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ext4: fix reserved cluster accounting at page invalidation time

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Add new code to count canceled pending cluster reservations on bigalloc
file systems and to reduce the cluster reservation count on all file
systems using delayed allocation.  This replaces old code in
ext4_da_page_release_reservations that was incorrect.

Signed-off-by: Eric Whitney <enwlinux@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Eric Whitney 2018-10-01 14:33:24 -04:00 • committed by Theodore Ts'o
parent 9fe671496b
commit f456767d33
3 changed files with 95 additions and 19 deletions
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23
fs/ext4/inode.c
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@ -1595,7 +1595,7 @@ static int ext4_da_reserve_space(struct inode *inode)
return 0; /* success */
}
static void ext4_da_release_space(struct inode *inode, int to_free)
void ext4_da_release_space(struct inode *inode, int to_free)
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
struct ext4_inode_info *ei = EXT4_I(inode);
@ -1634,13 +1634,11 @@ static void ext4_da_page_release_reservation(struct page *page,
unsigned int offset,
unsigned int length)
{
int to_release = 0, contiguous_blks = 0;
int contiguous_blks = 0;
struct buffer_head *head, *bh;
unsigned int curr_off = 0;
struct inode *inode = page->mapping->host;
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
unsigned int stop = offset + length;
int num_clusters;
ext4_fsblk_t lblk;
BUG_ON(stop > PAGE_SIZE || stop < length);
@ -1654,7 +1652,6 @@ static void ext4_da_page_release_reservation(struct page *page,
break;
if ((offset <= curr_off) && (buffer_delay(bh))) {
to_release++;
contiguous_blks++;
clear_buffer_delay(bh);
} else if (contiguous_blks) {
@ -1662,7 +1659,7 @@ static void ext4_da_page_release_reservation(struct page *page,
(PAGE_SHIFT - inode->i_blkbits);
lblk += (curr_off >> inode->i_blkbits) -
contiguous_blks;
ext4_es_remove_extent(inode, lblk, contiguous_blks);
ext4_es_remove_blks(inode, lblk, contiguous_blks);
contiguous_blks = 0;
}
curr_off = next_off;
@ -1671,21 +1668,9 @@ static void ext4_da_page_release_reservation(struct page *page,
if (contiguous_blks) {
lblk = page->index << (PAGE_SHIFT - inode->i_blkbits);
lblk += (curr_off >> inode->i_blkbits) - contiguous_blks;
ext4_es_remove_extent(inode, lblk, contiguous_blks);
ext4_es_remove_blks(inode, lblk, contiguous_blks);
}
/* If we have released all the blocks belonging to a cluster, then we
* need to release the reserved space for that cluster. */
num_clusters = EXT4_NUM_B2C(sbi, to_release);
while (num_clusters > 0) {
lblk = (page->index << (PAGE_SHIFT - inode->i_blkbits)) +
((num_clusters - 1) << sbi->s_cluster_bits);
if (sbi->s_cluster_ratio == 1 ||
!ext4_es_scan_clu(inode, &ext4_es_is_delayed, lblk))
ext4_da_release_space(inode, 1);
num_clusters--;
}
}
/*