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Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: Drop EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE flag
  ext4: Fix quota accounting error with fallocate
  ext4: Handle -EDQUOT error on write
This commit is contained in:
Linus Torvalds 2010-01-25 19:05:06 -08:00
parent 01974ea61f 1296cc85c2
commit 9a3cbe3265
3 changed files with 77 additions and 35 deletions
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9
fs/ext4/ext4.h
View File

@ -361,14 +361,11 @@ struct ext4_new_group_data {
so set the magic i_delalloc_reserve_flag after taking the
inode allocation semaphore for */
#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
/* Call ext4_da_update_reserve_space() after successfully
allocating the blocks */
#define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0008
/* caller is from the direct IO path, request to creation of an
unitialized extents if not allocated, split the uninitialized
extent if blocks has been preallocated already*/
#define EXT4_GET_BLOCKS_DIO 0x0010
#define EXT4_GET_BLOCKS_CONVERT 0x0020
#define EXT4_GET_BLOCKS_DIO 0x0008
#define EXT4_GET_BLOCKS_CONVERT 0x0010
#define EXT4_GET_BLOCKS_DIO_CREATE_EXT (EXT4_GET_BLOCKS_DIO|\
EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
/* Convert extent to initialized after direct IO complete */
@ -1443,6 +1440,8 @@ extern int ext4_block_truncate_page(handle_t *handle,
extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
extern qsize_t *ext4_get_reserved_space(struct inode *inode);
extern int flush_aio_dio_completed_IO(struct inode *inode);
extern void ext4_da_update_reserve_space(struct inode *inode,
int used, int quota_claim);
/* ioctl.c */
extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);

21
fs/ext4/extents.c
View File

@ -3132,7 +3132,19 @@ out:
unmap_underlying_metadata_blocks(inode->i_sb->s_bdev,
newblock + max_blocks,
allocated - max_blocks);
allocated = max_blocks;
}
/*
* If we have done fallocate with the offset that is already
* delayed allocated, we would have block reservation
* and quota reservation done in the delayed write path.
* But fallocate would have already updated quota and block
* count for this offset. So cancel these reservation
*/
if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
ext4_da_update_reserve_space(inode, allocated, 0);
map_out:
set_buffer_mapped(bh_result);
out1:
@ -3368,8 +3380,17 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
/* previous routine could use block we allocated */
newblock = ext_pblock(&newex);
allocated = ext4_ext_get_actual_len(&newex);
if (allocated > max_blocks)
allocated = max_blocks;
set_buffer_new(bh_result);
/*
* Update reserved blocks/metadata blocks after successful
* block allocation which had been deferred till now.
*/
if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
ext4_da_update_reserve_space(inode, allocated, 1);
/*
* Cache the extent and update transaction to commit on fdatasync only
* when it is _not_ an uninitialized extent.

74
fs/ext4/inode.c
View File

@ -1053,11 +1053,12 @@ static int ext4_calc_metadata_amount(struct inode *inode, sector_t lblock)
* Called with i_data_sem down, which is important since we can call
* ext4_discard_preallocations() from here.
*/
static void ext4_da_update_reserve_space(struct inode *inode, int used)
void ext4_da_update_reserve_space(struct inode *inode,
int used, int quota_claim)
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
struct ext4_inode_info *ei = EXT4_I(inode);
int mdb_free = 0;
int mdb_free = 0, allocated_meta_blocks = 0;
spin_lock(&ei->i_block_reservation_lock);
if (unlikely(used > ei->i_reserved_data_blocks)) {
@ -1073,6 +1074,7 @@ static void ext4_da_update_reserve_space(struct inode *inode, int used)
ei->i_reserved_data_blocks -= used;
used += ei->i_allocated_meta_blocks;
ei->i_reserved_meta_blocks -= ei->i_allocated_meta_blocks;
allocated_meta_blocks = ei->i_allocated_meta_blocks;
ei->i_allocated_meta_blocks = 0;
percpu_counter_sub(&sbi->s_dirtyblocks_counter, used);
@ -1090,9 +1092,23 @@ static void ext4_da_update_reserve_space(struct inode *inode, int used)
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
/* Update quota subsystem */
if (quota_claim) {
vfs_dq_claim_block(inode, used);
if (mdb_free)
vfs_dq_release_reservation_block(inode, mdb_free);
} else {
/*
* We did fallocate with an offset that is already delayed
* allocated. So on delayed allocated writeback we should
* not update the quota for allocated blocks. But then
* converting an fallocate region to initialized region would
* have caused a metadata allocation. So claim quota for
* that
*/
if (allocated_meta_blocks)
vfs_dq_claim_block(inode, allocated_meta_blocks);
vfs_dq_release_reservation_block(inode, mdb_free + used);
}
/*
* If we have done all the pending block allocations and if
@ -1292,17 +1308,19 @@ int ext4_get_blocks(handle_t *handle, struct inode *inode, sector_t block,
*/
EXT4_I(inode)->i_state &= ~EXT4_STATE_EXT_MIGRATE;
}
}
if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
EXT4_I(inode)->i_delalloc_reserved_flag = 0;
/*
* Update reserved blocks/metadata blocks after successful
* block allocation which had been deferred till now.
* block allocation which had been deferred till now. We don't
* support fallocate for non extent files. So we can update
* reserve space here.
*/
if ((retval > 0) && (flags & EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE))
ext4_da_update_reserve_space(inode, retval);
if ((retval > 0) &&
(flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE))
ext4_da_update_reserve_space(inode, retval, 1);
}
if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
EXT4_I(inode)->i_delalloc_reserved_flag = 0;
up_write((&EXT4_I(inode)->i_data_sem));
if (retval > 0 && buffer_mapped(bh)) {
@ -1835,24 +1853,12 @@ repeat:
* later. Real quota accounting is done at pages writeout
* time.
*/
if (vfs_dq_reserve_block(inode, md_needed + 1)) {
/*
* We tend to badly over-estimate the amount of
* metadata blocks which are needed, so if we have
* reserved any metadata blocks, try to force out the
* inode and see if we have any better luck.
*/
if (md_reserved && retries++ <= 3)
goto retry;
if (vfs_dq_reserve_block(inode, md_needed + 1))
return -EDQUOT;
}
if (ext4_claim_free_blocks(sbi, md_needed + 1)) {
vfs_dq_release_reservation_block(inode, md_needed + 1);
if (ext4_should_retry_alloc(inode->i_sb, &retries)) {
retry:
if (md_reserved)
write_inode_now(inode, (retries == 3));
yield();
goto repeat;
}
@ -2213,10 +2219,10 @@ static int mpage_da_map_blocks(struct mpage_da_data *mpd)
* variables are updated after the blocks have been allocated.
*/
new.b_state = 0;
get_blocks_flags = (EXT4_GET_BLOCKS_CREATE |
EXT4_GET_BLOCKS_DELALLOC_RESERVE);
get_blocks_flags = EXT4_GET_BLOCKS_CREATE;
if (mpd->b_state & (1 << BH_Delay))
get_blocks_flags |= EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE;
get_blocks_flags |= EXT4_GET_BLOCKS_DELALLOC_RESERVE;
blks = ext4_get_blocks(handle, mpd->inode, next, max_blocks,
&new, get_blocks_flags);
if (blks < 0) {
@ -3032,7 +3038,7 @@ static int ext4_da_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
int ret, retries = 0;
int ret, retries = 0, quota_retries = 0;
struct page *page;
pgoff_t index;
unsigned from, to;
@ -3091,6 +3097,22 @@ retry:
if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
goto retry;
if ((ret == -EDQUOT) &&
EXT4_I(inode)->i_reserved_meta_blocks &&
(quota_retries++ < 3)) {
/*
* Since we often over-estimate the number of meta
* data blocks required, we may sometimes get a
* spurios out of quota error even though there would
* be enough space once we write the data blocks and
* find out how many meta data blocks were _really_
* required. So try forcing the inode write to see if
* that helps.
*/
write_inode_now(inode, (quota_retries == 3));
goto retry;
}
out:
return ret;
}