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Bug fixes (all for stable kernels) for ext4:

Browse source 
* address corner cases for indirect blocks->extent migration
   * fix reserved block accounting invalidate_page when
 	page_size != block_size (i.e., ppc or 1k block size file systems)
   * fix deadlocks when a memcg is under heavy memory pressure
   * fix fencepost error in lazytime optimization
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Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Pull ext4 bugfixes from Ted Ts'o:
 "Bug fixes (all for stable kernels) for ext4:

   - address corner cases for indirect blocks->extent migration

   - fix reserved block accounting invalidate_page when
     page_size != block_size (i.e., ppc or 1k block size file systems)

   - fix deadlocks when a memcg is under heavy memory pressure

   - fix fencepost error in lazytime optimization"

* tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: replace open coded nofail allocation in ext4_free_blocks()
  ext4: correctly migrate a file with a hole at the beginning
  ext4: be more strict when migrating to non-extent based file
  ext4: fix reservation release on invalidatepage for delalloc fs
  ext4: avoid deadlocks in the writeback path by using sb_getblk_gfp
  bufferhead: Add _gfp version for sb_getblk()
  ext4: fix fencepost error in lazytime optimization
This commit is contained in:
Linus Torvalds 2015-07-05 16:24:54 -07:00
commit 1c4c7159ed
5 changed files with 47 additions and 21 deletions
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6
fs/ext4/extents.c
View file

@ -504,7 +504,7 @@ __read_extent_tree_block(const char *function, unsigned int line,
struct buffer_head *bh;
int err;
bh = sb_getblk(inode->i_sb, pblk);
bh = sb_getblk_gfp(inode->i_sb, pblk, __GFP_MOVABLE | GFP_NOFS);
if (unlikely(!bh))
return ERR_PTR(-ENOMEM);
@ -1089,7 +1089,7 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
err = -EIO;
goto cleanup;
}
bh = sb_getblk(inode->i_sb, newblock);
bh = sb_getblk_gfp(inode->i_sb, newblock, __GFP_MOVABLE | GFP_NOFS);
if (unlikely(!bh)) {
err = -ENOMEM;
goto cleanup;
@ -1283,7 +1283,7 @@ static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
if (newblock == 0)
return err;
bh = sb_getblk(inode->i_sb, newblock);
bh = sb_getblk_gfp(inode->i_sb, newblock, __GFP_MOVABLE | GFP_NOFS);
if (unlikely(!bh))
return -ENOMEM;
lock_buffer(bh);

22
fs/ext4/inode.c
View file

@ -1323,7 +1323,7 @@ static void ext4_da_page_release_reservation(struct page *page,
unsigned int offset,
unsigned int length)
{
int to_release = 0;
int to_release = 0, contiguous_blks = 0;
struct buffer_head *head, *bh;
unsigned int curr_off = 0;
struct inode *inode = page->mapping->host;
@ -1344,14 +1344,23 @@ static void ext4_da_page_release_reservation(struct page *page,
if ((offset <= curr_off) && (buffer_delay(bh))) {
to_release++;
contiguous_blks++;
clear_buffer_delay(bh);
} else if (contiguous_blks) {
lblk = page->index <<
(PAGE_CACHE_SHIFT - inode->i_blkbits);
lblk += (curr_off >> inode->i_blkbits) -
contiguous_blks;
ext4_es_remove_extent(inode, lblk, contiguous_blks);
contiguous_blks = 0;
}
curr_off = next_off;
} while ((bh = bh->b_this_page) != head);
if (to_release) {
if (contiguous_blks) {
lblk = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
ext4_es_remove_extent(inode, lblk, to_release);
lblk += (curr_off >> inode->i_blkbits) - contiguous_blks;
ext4_es_remove_extent(inode, lblk, contiguous_blks);
}
/* If we have released all the blocks belonging to a cluster, then we
@ -4344,7 +4353,12 @@ static void ext4_update_other_inodes_time(struct super_block *sb,
int inode_size = EXT4_INODE_SIZE(sb);
oi.orig_ino = orig_ino;
ino = (orig_ino & ~(inodes_per_block - 1)) + 1;
/*
* Calculate the first inode in the inode table block. Inode
* numbers are one-based. That is, the first inode in a block
* (assuming 4k blocks and 256 byte inodes) is (n*16 + 1).
*/
ino = ((orig_ino - 1) & ~(inodes_per_block - 1)) + 1;
for (i = 0; i < inodes_per_block; i++, ino++, buf += inode_size) {
if (ino == orig_ino)
continue;

16
fs/ext4/mballoc.c
View file

@ -4816,18 +4816,12 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,
/*
* blocks being freed are metadata. these blocks shouldn't
* be used until this transaction is committed
*
* We use __GFP_NOFAIL because ext4_free_blocks() is not allowed
* to fail.
*/
retry:
new_entry = kmem_cache_alloc(ext4_free_data_cachep, GFP_NOFS);
if (!new_entry) {
/*
* We use a retry loop because
* ext4_free_blocks() is not allowed to fail.
*/
cond_resched();
congestion_wait(BLK_RW_ASYNC, HZ/50);
goto retry;
}
new_entry = kmem_cache_alloc(ext4_free_data_cachep,
GFP_NOFS|__GFP_NOFAIL);
new_entry->efd_start_cluster = bit;
new_entry->efd_group = block_group;
new_entry->efd_count = count_clusters;

17
fs/ext4/migrate.c
View file

@ -620,6 +620,7 @@ int ext4_ind_migrate(struct inode *inode)
struct ext4_inode_info *ei = EXT4_I(inode);
struct ext4_extent *ex;
unsigned int i, len;
ext4_lblk_t start, end;
ext4_fsblk_t blk;
handle_t *handle;
int ret;
@ -633,6 +634,14 @@ int ext4_ind_migrate(struct inode *inode)
EXT4_FEATURE_RO_COMPAT_BIGALLOC))
return -EOPNOTSUPP;
/*
* In order to get correct extent info, force all delayed allocation
* blocks to be allocated, otherwise delayed allocation blocks may not
* be reflected and bypass the checks on extent header.
*/
if (test_opt(inode->i_sb, DELALLOC))
ext4_alloc_da_blocks(inode);
handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1);
if (IS_ERR(handle))
return PTR_ERR(handle);
@ -650,11 +659,13 @@ int ext4_ind_migrate(struct inode *inode)
goto errout;
}
if (eh->eh_entries == 0)
blk = len = 0;
blk = len = start = end = 0;
else {
len = le16_to_cpu(ex->ee_len);
blk = ext4_ext_pblock(ex);
if (len > EXT4_NDIR_BLOCKS) {
start = le32_to_cpu(ex->ee_block);
end = start + len - 1;
if (end >= EXT4_NDIR_BLOCKS) {
ret = -EOPNOTSUPP;
goto errout;
}
@ -662,7 +673,7 @@ int ext4_ind_migrate(struct inode *inode)
ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
memset(ei->i_data, 0, sizeof(ei->i_data));
for (i=0; i < len; i++)
for (i = start; i <= end; i++)
ei->i_data[i] = cpu_to_le32(blk++);
ext4_mark_inode_dirty(handle, inode);
errout:

7
include/linux/buffer_head.h
View file

@ -317,6 +317,13 @@ sb_getblk(struct super_block *sb, sector_t block)
return __getblk_gfp(sb->s_bdev, block, sb->s_blocksize, __GFP_MOVABLE);
}
static inline struct buffer_head *
sb_getblk_gfp(struct super_block *sb, sector_t block, gfp_t gfp)
{
return __getblk_gfp(sb->s_bdev, block, sb->s_blocksize, gfp);
}
static inline struct buffer_head *
sb_find_get_block(struct super_block *sb, sector_t block)
{