/[linux-patches]/hardened/2.6/trunk/2.6.28/1911_ext4-automatically-allocate-delay-allocated-blocks-on-close.patch
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Contents of /hardened/2.6/trunk/2.6.28/1911_ext4-automatically-allocate-delay-allocated-blocks-on-close.patch

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Revision 1519 - (show annotations) (download)
Wed Mar 18 19:25:21 2009 UTC (5 years, 6 months ago) by gengor
File size: 2306 byte(s)
Update 2.6.28 hardened-extras trunk/
1 Added-By: Gordon Malm <gengor@gentoo.org>
2
3 ---
4 From: Theodore Ts'o <tytso@mit.edu>
5 Date: Tue, 24 Feb 2009 13:21:14 +0000 (-0500)
6 Subject: ext4: Automatically allocate delay allocated blocks on close
7 X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftytso%2Fext4.git;a=commitdiff_plain;h=6645f8c3bc3cdaa7de4aaa3d34d40c2e8e5f09ae
8
9 ext4: Automatically allocate delay allocated blocks on close
10
11 When closing a file that had been previously truncated, force any
12 delay allocated blocks that to be allocated so that if the filesystem
13 is mounted with data=ordered, the data blocks will be pushed out to
14 disk along with the journal commit. Many application programs expect
15 this, so we do this to avoid zero length files if the system crashes
16 unexpectedly.
17
18 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
19 ---
20
21 diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
22 index ea51c89..234c731 100644
23 --- a/fs/ext4/ext4.h
24 +++ b/fs/ext4/ext4.h
25 @@ -269,6 +269,7 @@ static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
26 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
27 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
28 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
29 +#define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */
30
31 /* Used to pass group descriptor data when online resize is done */
32 struct ext4_new_group_input {
33 diff --git a/fs/ext4/file.c b/fs/ext4/file.c
34 index f731cb5..06df827 100644
35 --- a/fs/ext4/file.c
36 +++ b/fs/ext4/file.c
37 @@ -33,6 +33,10 @@
38 */
39 static int ext4_release_file(struct inode *inode, struct file *filp)
40 {
41 + if (EXT4_I(inode)->i_state & EXT4_STATE_DA_ALLOC_CLOSE) {
42 + ext4_alloc_da_blocks(inode);
43 + EXT4_I(inode)->i_state &= ~EXT4_STATE_DA_ALLOC_CLOSE;
44 + }
45 /* if we are the last writer on the inode, drop the block reservation */
46 if ((filp->f_mode & FMODE_WRITE) &&
47 (atomic_read(&inode->i_writecount) == 1))
48 diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
49 index ead57ab..666caa9 100644
50 --- a/fs/ext4/inode.c
51 +++ b/fs/ext4/inode.c
52 @@ -3871,6 +3871,9 @@ void ext4_truncate(struct inode *inode)
53 if (!ext4_can_truncate(inode))
54 return;
55
56 + if (inode->i_size == 0)
57 + ei->i_state |= EXT4_STATE_DA_ALLOC_CLOSE;
58 +
59 if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
60 ext4_ext_truncate(inode);
61 return;

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