Messages in this thread Patch in this message | | | Date | Tue, 09 Jun 2009 02:40:05 -0700 | From | Greg KH <> | Subject | [patch 77/87] ext4: Fix discard of inode prealloc space with delayed allocation. |
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2.6.29-stable review patch. If anyone has any objections, please let us know.
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From: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
(cherry picked from commit d6014301b5599fba395c42a1e96a7fe86f7d0b2d)
With delayed allocation we should not/cannot discard inode prealloc space during file close. We would still have dirty pages for which we haven't allocated blocks yet. With this fix after each get_blocks request we check whether we have zero reserved blocks and if yes and we don't have any writers on the file we discard inode prealloc space.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- fs/ext4/file.c | 3 ++- fs/ext4/inode.c | 9 ++++++++- 2 files changed, 10 insertions(+), 2 deletions(-)
--- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -39,7 +39,8 @@ static int ext4_release_file(struct inod } /* if we are the last writer on the inode, drop the block reservation */ if ((filp->f_mode & FMODE_WRITE) && - (atomic_read(&inode->i_writecount) == 1)) + (atomic_read(&inode->i_writecount) == 1) && + !EXT4_I(inode)->i_reserved_data_blocks) { down_write(&EXT4_I(inode)->i_data_sem); ext4_discard_preallocations(inode); --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -1036,8 +1036,15 @@ static void ext4_da_update_reserve_space /* update per-inode reservations */ BUG_ON(used > EXT4_I(inode)->i_reserved_data_blocks); EXT4_I(inode)->i_reserved_data_blocks -= used; - spin_unlock(&EXT4_I(inode)->i_block_reservation_lock); + + /* + * If we have done all the pending block allocations and if + * there aren't any writers on the inode, we can discard the + * inode's preallocations. + */ + if (!total && (atomic_read(&inode->i_writecount) == 0)) + ext4_discard_preallocations(inode); } /*
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