This is a note to let you know that I've just added the patch titled
udf: don't increment lenExtents while writing to a hole
to the 3.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
udf-don-t-increment-lenextents-while-writing-to-a-hole.patch
and it can be found in the queue-3.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From fb719c59bdb4fca86ee1fd1f42ab3735ca12b6b2 Mon Sep 17 00:00:00 2001
From: Namjae Jeon <[email protected]>
Date: Wed, 10 Oct 2012 00:09:12 +0900
Subject: udf: don't increment lenExtents while writing to a hole
From: Namjae Jeon <[email protected]>
commit fb719c59bdb4fca86ee1fd1f42ab3735ca12b6b2 upstream.
Incrementing lenExtents even while writing to a hole is bad
for performance as calls to udf_discard_prealloc and
udf_truncate_tail_extent would not return from start if
isize != lenExtents
Signed-off-by: Namjae Jeon <[email protected]>
Signed-off-by: Ashish Sangwan <[email protected]>
Signed-off-by: Jan Kara <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/udf/inode.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -601,6 +601,7 @@ static sector_t inode_getblk(struct inod
struct udf_inode_info *iinfo = UDF_I(inode);
int goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
int lastblock = 0;
+ bool isBeyondEOF;
*err = 0;
*new = 0;
@@ -680,7 +681,7 @@ static sector_t inode_getblk(struct inod
/* Are we beyond EOF? */
if (etype == -1) {
int ret;
-
+ isBeyondEOF = 1;
if (count) {
if (c)
laarr[0] = laarr[1];
@@ -723,6 +724,7 @@ static sector_t inode_getblk(struct inod
endnum = c + 1;
lastblock = 1;
} else {
+ isBeyondEOF = 0;
endnum = startnum = ((count > 2) ? 2 : count);
/* if the current extent is in position 0,
@@ -770,7 +772,8 @@ static sector_t inode_getblk(struct inod
*err = -ENOSPC;
return 0;
}
- iinfo->i_lenExtents += inode->i_sb->s_blocksize;
+ if (isBeyondEOF)
+ iinfo->i_lenExtents += inode->i_sb->s_blocksize;
}
/* if the extent the requsted block is located in contains multiple
Patches currently in stable-queue which might be from [email protected]
are
queue-3.7/udf-don-t-increment-lenextents-while-writing-to-a-hole.patch
queue-3.7/udf-fix-memory-leak-while-allocating-blocks-during-write.patch
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