From d6014301b5599fba395c42a1e96a7fe86f7d0b2d Mon Sep 17 00:00:00 2001
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Date: Fri, 27 Mar 2009 22:36:43 -0400
Subject: [PATCH] ext4: Fix discard of inode prealloc space with delayed
allocation.
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>
---
fs/ext4/file.c | 3 ++-
fs/ext4/inode.c | 9 ++++++++-
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 06df8272c639..588af8c77246 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -39,7 +39,8 @@ static int ext4_release_file(struct inode *inode, struct file *filp)
}
/* 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);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 80ed6dc9c9d2..7dcac9d7e491 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1067,9 +1067,16 @@ static void ext4_da_update_reserve_space(struct inode *inode, int used)
/*
* free those over-booking quota for metadata blocks
*/
-
if (mdb_free)
vfs_dq_release_reservation_block(inode, mdb_free);
+
+ /*
+ * 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);
}
/*