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authorTheodore Ts'o <tytso@mit.edu>2015-06-21 01:25:29 -0400
committerTheodore Ts'o <tytso@mit.edu>2015-06-21 01:25:29 -0400
commitc5e298ae53dc2eb69f2f7153be03454c8a33c658 (patch)
tree07bd2e74badcff3d55627b2f315b1640bbde15d8 /fs/ext4
parent89d96a6f8e6491f24fc8f99fd6ae66820e85c6c1 (diff)
ext4: prevent ext4_quota_write() from failing due to ENOSPC
In order to prevent quota block tracking to be inaccurate when ext4_quota_write() fails with ENOSPC, we make two changes. The quota file can now use the reserved block (since the quota file is arguably file system metadata), and ext4_quota_write() now uses ext4_should_retry_alloc() to retry the block allocation after a commit has completed and released some blocks for allocation. This fixes failures of xfstests generic/270: Quota error (device vdc): write_blk: dquota write failed Quota error (device vdc): qtree_write_dquot: Error -28 occurred while creating quota Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/extents.c2
-rw-r--r--fs/ext4/indirect.c2
-rw-r--r--fs/ext4/inode.c10
-rw-r--r--fs/ext4/namei.c2
-rw-r--r--fs/ext4/super.c8
5 files changed, 17 insertions, 7 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 1ba8b4ab03a8..d86d2622f826 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4456,6 +4456,8 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
ar.flags |= EXT4_MB_HINT_NOPREALLOC;
if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
ar.flags |= EXT4_MB_DELALLOC_RESERVED;
+ if (flags & EXT4_GET_BLOCKS_METADATA_NOFAIL)
+ ar.flags |= EXT4_MB_USE_RESERVED;
newblock = ext4_mb_new_blocks(handle, &ar, &err);
if (!newblock)
goto out2;
diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c
index 958824019509..9962d577bad5 100644
--- a/fs/ext4/indirect.c
+++ b/fs/ext4/indirect.c
@@ -576,6 +576,8 @@ int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
ar.flags = EXT4_MB_HINT_DATA;
if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
ar.flags |= EXT4_MB_DELALLOC_RESERVED;
+ if (flags & EXT4_GET_BLOCKS_METADATA_NOFAIL)
+ ar.flags |= EXT4_MB_USE_RESERVED;
ar.goal = ext4_find_goal(inode, map->m_lblk, partial);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 263a46c488c7..e8a67b8ba90c 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -731,18 +731,18 @@ int ext4_get_block(struct inode *inode, sector_t iblock,
* `handle' can be NULL if create is zero
*/
struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode,
- ext4_lblk_t block, int create)
+ ext4_lblk_t block, int map_flags)
{
struct ext4_map_blocks map;
struct buffer_head *bh;
+ int create = map_flags & EXT4_GET_BLOCKS_CREATE;
int err;
J_ASSERT(handle != NULL || create == 0);
map.m_lblk = block;
map.m_len = 1;
- err = ext4_map_blocks(handle, inode, &map,
- create ? EXT4_GET_BLOCKS_CREATE : 0);
+ err = ext4_map_blocks(handle, inode, &map, map_flags);
if (err == 0)
return create ? ERR_PTR(-ENOSPC) : NULL;
@@ -788,11 +788,11 @@ errout:
}
struct buffer_head *ext4_bread(handle_t *handle, struct inode *inode,
- ext4_lblk_t block, int create)
+ ext4_lblk_t block, int map_flags)
{
struct buffer_head *bh;
- bh = ext4_getblk(handle, inode, block, create);
+ bh = ext4_getblk(handle, inode, block, map_flags);
if (IS_ERR(bh))
return bh;
if (!bh || buffer_uptodate(bh))
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 5e7676f1e82f..e230b31251f7 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -61,7 +61,7 @@ static struct buffer_head *ext4_append(handle_t *handle,
*block = inode->i_size >> inode->i_sb->s_blocksize_bits;
- bh = ext4_bread(handle, inode, *block, 1);
+ bh = ext4_bread(handle, inode, *block, EXT4_GET_BLOCKS_CREATE);
if (IS_ERR(bh))
return bh;
inode->i_size += inode->i_sb->s_blocksize;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 2858ac09f5a3..bd4df9d379b2 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -5438,6 +5438,7 @@ static ssize_t ext4_quota_write(struct super_block *sb, int type,
struct inode *inode = sb_dqopt(sb)->files[type];
ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
int err, offset = off & (sb->s_blocksize - 1);
+ int retries = 0;
struct buffer_head *bh;
handle_t *handle = journal_current_handle();
@@ -5458,7 +5459,12 @@ static ssize_t ext4_quota_write(struct super_block *sb, int type,
return -EIO;
}
- bh = ext4_bread(handle, inode, blk, 1);
+ do {
+ bh = ext4_bread(handle, inode, blk,
+ EXT4_GET_BLOCKS_CREATE |
+ EXT4_GET_BLOCKS_METADATA_NOFAIL);
+ } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
+ ext4_should_retry_alloc(inode->i_sb, &retries));
if (IS_ERR(bh))
return PTR_ERR(bh);
if (!bh)