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authorJan Kara <jack@suse.cz>2020-03-18 15:13:17 +0300
committerTheodore Ts'o <tytso@mit.edu>2020-03-26 17:55:00 +0300
commitd05466b27b19af8e148376590ed54d289b607f0a (patch)
tree904b8e026266797c5292283fb1ddfffb9e8f2185 /fs/ext4
parent5e47868fb94b63c7068dcfd2469d99fba06bae9d (diff)
downloadlinux-d05466b27b19af8e148376590ed54d289b607f0a.tar.xz
ext4: avoid ENOSPC when avoiding to reuse recently deleted inodes
When ext4 is running on a filesystem without a journal, it tries not to reuse recently deleted inodes to provide better chances for filesystem recovery in case of crash. However this logic forbids reuse of freed inodes for up to 5 minutes and especially for filesystems with smaller number of inodes can lead to ENOSPC errors returned when allocating new inodes. Fix the problem by allowing to reuse recently deleted inode if there's no other inode free in the scanned range. Signed-off-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20200318121317.31941-1-jack@suse.cz Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/ialloc.c23
1 files changed, 18 insertions, 5 deletions
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index f95ee99091e4..9652a0eadd1c 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -712,21 +712,34 @@ out:
static int find_inode_bit(struct super_block *sb, ext4_group_t group,
struct buffer_head *bitmap, unsigned long *ino)
{
+ bool check_recently_deleted = EXT4_SB(sb)->s_journal == NULL;
+ unsigned long recently_deleted_ino = EXT4_INODES_PER_GROUP(sb);
+
next:
*ino = ext4_find_next_zero_bit((unsigned long *)
bitmap->b_data,
EXT4_INODES_PER_GROUP(sb), *ino);
if (*ino >= EXT4_INODES_PER_GROUP(sb))
- return 0;
+ goto not_found;
- if ((EXT4_SB(sb)->s_journal == NULL) &&
- recently_deleted(sb, group, *ino)) {
+ if (check_recently_deleted && recently_deleted(sb, group, *ino)) {
+ recently_deleted_ino = *ino;
*ino = *ino + 1;
if (*ino < EXT4_INODES_PER_GROUP(sb))
goto next;
- return 0;
+ goto not_found;
}
-
+ return 1;
+not_found:
+ if (recently_deleted_ino >= EXT4_INODES_PER_GROUP(sb))
+ return 0;
+ /*
+ * Not reusing recently deleted inodes is mostly a preference. We don't
+ * want to report ENOSPC or skew allocation patterns because of that.
+ * So return even recently deleted inode if we could find better in the
+ * given range.
+ */
+ *ino = recently_deleted_ino;
return 1;
}