From: "Amit K. Arora" <aarora@linux.vnet.ibm.com>
To: torvalds@osdl.org, akpm@linux-foundation.org
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-ext4@vger.kernel.org, xfs@oss.sgi.com, suparna@in.ibm.com,
cmm@us.ibm.com
Subject: [PATCH 3/5][TAKE3] ext4: Extent overlap bugfix
Date: Wed, 16 May 2007 01:43:30 +0530 [thread overview]
Message-ID: <20070515201330.GC5834@amitarora.in.ibm.com> (raw)
In-Reply-To: <20070515195421.GA2948@amitarora.in.ibm.com>
This patch adds a check for overlap of extents and cuts short the
new extent to be inserted, if there is a chance of overlap.
Changelog:
---------
Note: The changes below are from the initial post (dated 26th April,
2007) and _not_ from TAKE2. The only difference from TAKE2 is the kernel
version on which this patch is based. TAKE2 was based on 2.6.21 and this
is based on 2.6.22-rc1.
As suggested by Andrew, a check for wrap though zero has been added.
Here is the new patch:
Signed-off-by: Amit Arora <aarora@in.ibm.com>
---
fs/ext4/extents.c | 60 ++++++++++++++++++++++++++++++++++++++--
include/linux/ext4_fs_extents.h | 1
2 files changed, 59 insertions(+), 2 deletions(-)
Index: linux-2.6.22-rc1/fs/ext4/extents.c
===================================================================
--- linux-2.6.22-rc1.orig/fs/ext4/extents.c
+++ linux-2.6.22-rc1/fs/ext4/extents.c
@@ -1128,6 +1128,55 @@ ext4_can_extents_be_merged(struct inode
}
/*
+ * check if a portion of the "newext" extent overlaps with an
+ * existing extent.
+ *
+ * If there is an overlap discovered, it updates the length of the newext
+ * such that there will be no overlap, and then returns 1.
+ * If there is no overlap found, it returns 0.
+ */
+unsigned int ext4_ext_check_overlap(struct inode *inode,
+ struct ext4_extent *newext,
+ struct ext4_ext_path *path)
+{
+ unsigned long b1, b2;
+ unsigned int depth, len1;
+ unsigned int ret = 0;
+
+ b1 = le32_to_cpu(newext->ee_block);
+ len1 = le16_to_cpu(newext->ee_len);
+ depth = ext_depth(inode);
+ if (!path[depth].p_ext)
+ goto out;
+ b2 = le32_to_cpu(path[depth].p_ext->ee_block);
+
+ /*
+ * get the next allocated block if the extent in the path
+ * is before the requested block(s)
+ */
+ if (b2 < b1) {
+ b2 = ext4_ext_next_allocated_block(path);
+ if (b2 == EXT_MAX_BLOCK)
+ goto out;
+ }
+
+ /* check for wrap through zero */
+ if (b1 + len1 < b1) {
+ len1 = EXT_MAX_BLOCK - b1;
+ newext->ee_len = cpu_to_le16(len1);
+ ret = 1;
+ }
+
+ /* check for overlap */
+ if (b1 + len1 > b2) {
+ newext->ee_len = cpu_to_le16(b2 - b1);
+ ret = 1;
+ }
+out:
+ return ret;
+}
+
+/*
* ext4_ext_insert_extent:
* tries to merge requsted extent into the existing extent or
* inserts requested extent as new one into the tree,
@@ -2031,7 +2080,15 @@ int ext4_ext_get_blocks(handle_t *handle
/* allocate new block */
goal = ext4_ext_find_goal(inode, path, iblock);
- allocated = max_blocks;
+
+ /* Check if we can really insert (iblock)::(iblock+max_blocks) extent */
+ newex.ee_block = cpu_to_le32(iblock);
+ newex.ee_len = cpu_to_le16(max_blocks);
+ err = ext4_ext_check_overlap(inode, &newex, path);
+ if (err)
+ allocated = le16_to_cpu(newex.ee_len);
+ else
+ allocated = max_blocks;
newblock = ext4_new_blocks(handle, inode, goal, &allocated, &err);
if (!newblock)
goto out2;
@@ -2039,7 +2096,6 @@ int ext4_ext_get_blocks(handle_t *handle
goal, newblock, allocated);
/* try to insert new extent into found leaf and return */
- newex.ee_block = cpu_to_le32(iblock);
ext4_ext_store_pblock(&newex, newblock);
newex.ee_len = cpu_to_le16(allocated);
err = ext4_ext_insert_extent(handle, inode, path, &newex);
Index: linux-2.6.22-rc1/include/linux/ext4_fs_extents.h
===================================================================
--- linux-2.6.22-rc1.orig/include/linux/ext4_fs_extents.h
+++ linux-2.6.22-rc1/include/linux/ext4_fs_extents.h
@@ -190,6 +190,7 @@ ext4_ext_invalidate_cache(struct inode *
extern int ext4_extent_tree_init(handle_t *, struct inode *);
extern int ext4_ext_calc_credits_for_insert(struct inode *, struct ext4_ext_path *);
+extern unsigned int ext4_ext_check_overlap(struct inode *, struct ext4_extent *, struct ext4_ext_path *);
extern int ext4_ext_insert_extent(handle_t *, struct inode *, struct ext4_ext_path *, struct ext4_extent *);
extern int ext4_ext_walk_space(struct inode *, unsigned long, unsigned long, ext_prepare_callback, void *);
extern struct ext4_ext_path * ext4_ext_find_extent(struct inode *, int, struct ext4_ext_path *);
next prev parent reply other threads:[~2007-05-15 20:13 UTC|newest]
Thread overview: 293+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20070117094658.GA17390@amitarora.in.ibm.com>
[not found] ` <20070225022326.137b4875.akpm@linux-foundation.org>
2007-03-01 18:34 ` [RFC] Heads up on sys_fallocate() Amit K. Arora
2007-03-01 19:15 ` Eric Sandeen
2007-03-02 10:45 ` Andreas Dilger
2007-03-02 13:17 ` Dave Kleikamp
2007-03-01 20:23 ` Jeff Garzik
2007-03-01 20:31 ` Jeremy Allison
2007-03-01 21:14 ` Jeremy Fitzhardinge
2007-03-01 22:58 ` Alan
2007-03-01 22:05 ` Jeremy Fitzhardinge
2007-03-01 23:11 ` Alan
2007-03-01 22:15 ` Jeremy Fitzhardinge
2007-03-01 22:25 ` Andrew Morton
2007-03-01 22:40 ` Nathan Scott
2007-03-01 22:39 ` Eric Sandeen
2007-03-01 22:52 ` Andrew Morton
2007-03-02 18:28 ` Mingming Cao
2007-03-05 12:27 ` Jan Kara
2007-03-05 20:02 ` Mingming Cao
2007-03-06 7:28 ` Christoph Hellwig
2007-03-06 14:36 ` Ulrich Drepper
2007-03-06 14:47 ` Christoph Hellwig
2007-03-06 14:50 ` Jan Kara
2007-03-06 18:23 ` Eric Sandeen
2007-03-07 8:51 ` Jan Kara
2007-03-07 11:30 ` Jörn Engel
2007-03-06 16:46 ` Eric Sandeen
2007-03-13 23:46 ` David Chinner
2007-03-05 21:41 ` Eric Sandeen
2007-03-01 22:41 ` Anton Blanchard
2007-03-01 22:44 ` Dave Kleikamp
2007-03-01 22:59 ` Andrew Morton
2007-03-01 23:09 ` Dave Kleikamp
2007-03-02 13:41 ` Jan Engelhardt
2007-03-02 18:09 ` Mingming Cao
2007-03-02 7:09 ` Ulrich Drepper
2007-03-01 23:38 ` Christoph Hellwig
2007-03-03 22:45 ` Arnd Bergmann
2007-03-04 20:11 ` Anton Altaparmakov
2007-03-04 20:53 ` Arnd Bergmann
2007-03-04 22:38 ` Ulrich Drepper
2007-03-04 23:22 ` Anton Altaparmakov
2007-03-05 14:37 ` Theodore Tso
2007-03-05 15:07 ` Anton Altaparmakov
2007-03-05 15:15 ` Ulrich Drepper
2007-03-05 15:35 ` Christoph Hellwig
2007-03-05 16:01 ` Theodore Tso
2007-03-05 16:07 ` Ulrich Drepper
2007-03-05 0:16 ` Jörn Engel
2007-03-05 0:32 ` Anton Altaparmakov
2007-03-05 0:35 ` Anton Altaparmakov
2007-03-05 0:44 ` Arnd Bergmann
2007-03-05 11:49 ` Jörn Engel
2007-03-05 15:09 ` Ulrich Drepper
2007-03-05 0:36 ` Arnd Bergmann
2007-03-05 11:41 ` Jörn Engel
2007-03-05 15:08 ` Ulrich Drepper
2007-03-05 15:33 ` Jörn Engel
2007-03-05 15:48 ` Ulrich Drepper
2007-03-05 22:00 ` Eric Sandeen
2007-03-05 4:23 ` Christoph Hellwig
2007-03-05 13:18 ` Christoph Hellwig
2007-03-01 23:29 ` Eric Sandeen
2007-03-01 23:51 ` Christoph Hellwig
2007-03-01 23:36 ` Christoph Hellwig
2007-03-02 6:03 ` Badari Pulavarty
2007-03-02 6:16 ` Andrew Morton
2007-03-02 13:23 ` Dave Kleikamp
2007-03-02 15:29 ` Ulrich Drepper
2007-03-02 15:16 ` Eric Sandeen
2007-03-02 16:13 ` Badari Pulavarty
2007-03-02 17:01 ` Andrew Morton
2007-03-02 17:19 ` Eric Sandeen
2007-03-16 14:31 ` [RFC][PATCH] sys_fallocate() system call Amit K. Arora
2007-03-16 15:21 ` Heiko Carstens
2007-03-19 9:24 ` Amit K. Arora
2007-03-19 11:23 ` Heiko Carstens
2007-03-16 16:17 ` Heiko Carstens
2007-03-17 9:59 ` Paul Mackerras
2007-03-17 11:07 ` Matthew Wilcox
2007-03-17 14:30 ` Heiko Carstens
2007-03-17 14:38 ` Stephen Rothwell
2007-03-17 14:42 ` Stephen Rothwell
2007-03-17 11:10 ` Matthew Wilcox
2007-03-21 12:04 ` Amit K. Arora
2007-03-21 21:35 ` Chris Wedgwood
2007-03-29 11:51 ` Interface for the new fallocate() " Amit K. Arora
2007-03-29 16:35 ` Chris Wedgwood
2007-03-29 17:01 ` Jan Engelhardt
2007-03-29 17:18 ` linux-os (Dick Johnson)
2007-03-29 18:05 ` Jan Engelhardt
2007-03-29 18:37 ` Linus Torvalds
2007-03-30 7:00 ` Heiko Carstens
2007-03-29 17:10 ` Andrew Morton
2007-03-30 7:14 ` Jakub Jelinek
2007-03-30 8:39 ` Heiko Carstens
2007-03-30 9:15 ` Paul Mackerras
2007-04-05 11:26 ` Amit K. Arora
2007-04-05 11:44 ` Amit K. Arora
2007-04-05 15:50 ` Randy Dunlap
2007-04-06 9:58 ` Andreas Dilger
2007-04-17 12:55 ` Amit K. Arora
2007-04-18 13:06 ` Andreas Dilger
2007-04-20 13:51 ` Amit K. Arora
2007-04-20 14:59 ` Jakub Jelinek
2007-04-24 12:16 ` Amit K. Arora
2007-04-26 17:50 ` [PATCH 0/5] fallocate " Amit K. Arora
2007-04-26 18:03 ` [PATCH 1/5] fallocate() implementation in i86, x86_64 and powerpc Amit K. Arora
2007-05-04 4:29 ` Andrew Morton
2007-05-04 4:41 ` Paul Mackerras
2007-05-09 10:15 ` Suparna Bhattacharya
2007-05-09 10:50 ` Paul Mackerras
2007-05-09 11:10 ` Suparna Bhattacharya
2007-05-09 11:37 ` Paul Mackerras
2007-05-09 12:00 ` Martin Schwidefsky
2007-05-09 12:05 ` Amit K. Arora
2007-05-04 4:55 ` Andrew Morton
2007-05-04 6:07 ` David Chinner
2007-05-04 6:28 ` Andrew Morton
2007-05-04 6:56 ` Jakub Jelinek
2007-05-07 13:08 ` Ulrich Drepper
2007-05-04 7:27 ` David Chinner
2007-05-07 11:10 ` Amit K. Arora
2007-05-07 11:03 ` Amit K. Arora
2007-05-09 16:01 ` Amit K. Arora
2007-05-09 16:54 ` Andreas Dilger
2007-05-09 17:07 ` Mingming Cao
2007-05-10 0:59 ` David Chinner
2007-05-10 11:56 ` Amit K. Arora
2007-05-10 22:39 ` David Chinner
2007-05-11 11:03 ` Suparna Bhattacharya
2007-05-12 8:01 ` David Chinner
2007-06-12 6:16 ` Amit K. Arora
2007-06-12 8:11 ` David Chinner
2007-06-13 23:52 ` David Chinner
2007-06-14 9:14 ` Andreas Dilger
2007-06-14 12:04 ` David Chinner
2007-06-14 19:33 ` Andreas Dilger
2007-06-25 13:28 ` [PATCH 0/6][TAKE5] fallocate system call Amit K. Arora
2007-06-25 13:40 ` [PATCH 1/7][TAKE5] fallocate() implementation on i386, x86_64 and powerpc Amit K. Arora
2007-06-26 19:38 ` Heiko Carstens
2007-06-25 13:42 ` [PATCH 2/7][TAKE5] fallocate() on s390(x) Amit K. Arora
2007-06-26 15:15 ` Heiko Carstens
2007-06-25 13:43 ` [PATCH 3/7][TAKE5] fallocate() on ia64 Amit K. Arora
2007-06-25 13:45 ` [PATCH 4/7][TAKE5] support new modes in fallocate Amit K. Arora
2007-06-25 15:03 ` Amit K. Arora
2007-06-25 21:46 ` Andreas Dilger
2007-06-26 10:32 ` Amit K. Arora
2007-06-26 15:34 ` Andreas Dilger
2007-06-26 19:09 ` Amit K. Arora
2007-06-26 23:18 ` David Chinner
2007-06-28 18:19 ` Amit K. Arora
2007-06-28 23:39 ` Nathan Scott
2007-06-29 1:03 ` David Chinner
2007-06-30 10:21 ` Christoph Hellwig
2007-06-30 16:52 ` Andreas Dilger
2007-07-03 10:08 ` Amit K. Arora
2007-07-03 10:31 ` Christoph Hellwig
2007-07-03 11:46 ` Amit K. Arora
2007-07-04 5:37 ` Timothy Shimmin
2007-07-11 9:04 ` Christoph Hellwig
2007-07-11 9:03 ` Christoph Hellwig
2007-07-12 7:28 ` Suparna Bhattacharya
2007-07-12 8:26 ` Amit K. Arora
2007-07-12 14:40 ` Andreas Dilger
2007-07-12 13:13 ` David Chinner
2007-07-12 14:15 ` Amit K. Arora
2007-07-01 22:55 ` David Chinner
2007-07-02 11:47 ` Amit K. Arora
2007-07-11 9:05 ` Christoph Hellwig
2007-06-26 23:14 ` David Chinner
2007-06-25 21:52 ` Andreas Dilger
2007-06-26 10:45 ` Amit K. Arora
2007-06-26 15:42 ` Andreas Dilger
2007-06-26 19:12 ` Amit K. Arora
2007-06-26 23:32 ` David Chinner
2007-06-26 23:26 ` David Chinner
2007-06-25 13:48 ` [PATCH 5/7][TAKE5] ext4: fallocate support in ext4 Amit K. Arora
2007-06-25 13:49 ` [PATCH 6/7][TAKE5] ext4: write support for preallocated blocks Amit K. Arora
2007-06-25 13:50 ` [PATCH 7/7][TAKE5] ext4: support new modes Amit K. Arora
2007-06-25 21:56 ` Andreas Dilger
2007-06-26 12:07 ` Amit K. Arora
2007-06-26 16:14 ` Andreas Dilger
2007-06-26 19:29 ` Amit K. Arora
2007-06-27 0:04 ` David Chinner
2007-06-28 18:07 ` Amit K. Arora
2007-06-26 23:15 ` [PATCH 0/6][TAKE5] fallocate system call David Chinner
2007-06-28 9:55 ` Andrew Morton
2007-06-28 17:36 ` Mingming Cao
2007-06-28 17:57 ` Amit K. Arora
2007-06-28 18:33 ` Andrew Morton
2007-06-28 18:45 ` Dave Kleikamp
2007-06-28 18:57 ` Jeff Garzik
2007-06-29 7:20 ` Christoph Hellwig
2007-06-29 13:56 ` Theodore Tso
2007-06-29 14:29 ` Jeff Garzik
2007-06-29 17:42 ` Theodore Tso
2007-06-29 15:50 ` Mingming Caoc
2007-06-29 20:57 ` Andrew Morton
2007-07-01 7:35 ` Ext4 patches for 2.6.22-rc6 Mingming Cao
2007-06-28 20:34 ` [PATCH 0/6][TAKE5] fallocate system call Andreas Dilger
2007-06-30 10:14 ` [PATCH 1/5] fallocate() implementation in i86, x86_64 and powerpc Christoph Hellwig
2007-04-26 18:07 ` [PATCH 2/5] fallocate() on s390 Amit K. Arora
2007-04-26 18:11 ` [PATCH 3/5] ext4: Extent overlap bugfix Amit K. Arora
2007-05-04 4:30 ` Andrew Morton
2007-05-07 11:46 ` Amit K. Arora
2007-04-26 18:13 ` [PATCH 4/5] ext4: fallocate support in ext4 Amit K. Arora
2007-05-04 4:31 ` Andrew Morton
2007-05-07 11:37 ` Andreas Dilger
2007-05-07 20:58 ` Andrew Morton
2007-05-07 22:21 ` Andreas Dilger
2007-05-07 22:38 ` Andrew Morton
2007-05-07 23:14 ` Theodore Tso
2007-05-07 23:31 ` Andrew Morton
2007-05-08 0:30 ` Mingming Cao
2007-05-07 23:02 ` Jeff Garzik
2007-05-07 23:36 ` Theodore Tso
2007-05-08 1:07 ` Andreas Dilger
2007-05-08 1:25 ` Jeff Garzik
2007-05-08 0:00 ` Mingming Cao
2007-05-08 0:15 ` Andrew Morton
2007-05-08 0:41 ` Mingming Cao
2007-05-08 1:43 ` Theodore Tso
2007-05-08 16:52 ` Andreas Dilger
2007-05-08 17:46 ` Mingming Cao
2007-05-14 13:34 ` Jan Kara
2007-05-07 12:07 ` Amit K. Arora
2007-05-07 15:24 ` Dave Kleikamp
2007-05-08 10:52 ` Amit K. Arora
2007-05-08 14:47 ` Dave Kleikamp
2007-04-26 18:16 ` [PATCH 5/5] ext4: write support for preallocated blocks/extents Amit K. Arora
2007-05-04 4:32 ` Andrew Morton
2007-05-07 12:11 ` Amit K. Arora
2007-05-07 12:40 ` Pekka Enberg
2007-05-07 13:04 ` Amit K. Arora
2007-04-27 12:10 ` [PATCH 0/5] fallocate system call Heiko Carstens
2007-04-27 14:43 ` Jörn Engel
2007-04-27 17:46 ` Heiko Carstens
2007-04-27 20:42 ` Chris Wedgwood
2007-04-30 0:47 ` David Chinner
2007-04-30 3:09 ` [PATCH] ia64 fallocate syscall David Chinner
2007-04-30 3:11 ` [PATCH] XFS ->fallocate() support David Chinner
2007-04-30 3:14 ` [PATCH] Add preallocation beyond EOF to fallocate David Chinner
2007-04-30 5:25 ` [PATCH 0/5] fallocate system call Chris Wedgwood
2007-04-30 5:56 ` David Chinner
2007-04-30 6:01 ` Chris Wedgwood
2007-05-02 12:53 ` Amit K. Arora
2007-05-03 10:34 ` Andreas Dilger
2007-05-03 11:22 ` Miquel van Smoorenburg
2007-05-08 2:26 ` David Chinner
2007-05-14 13:29 ` [PATCH 0/5][TAKE2] " Amit K. Arora
[not found] ` <20070514142820.GA31468@amitarora.in.ibm.com>
2007-05-14 14:45 ` [PATCH 1/5][TAKE2] fallocate() implementation on i86, x86_64 and powerpc Amit K. Arora
2007-05-14 23:44 ` Stephen Rothwell
2007-05-15 13:23 ` Amit K. Arora
2007-05-14 14:48 ` [PATCH 2/5][TAKE2] fallocate() on s390 Amit K. Arora
2007-05-14 15:33 ` [PATCH 2/5][TAKE2] fallocate() on s390 - glibc wrapper Amit K. Arora
2007-05-14 14:50 ` [PATCH 3/5][TAKE2] ext4: Extent overlap bugfix Amit K. Arora
2007-05-14 14:52 ` [PATCH 4/5][TAKE2] ext4: fallocate support in ext4 Amit K. Arora
2007-05-14 14:54 ` [PATCH 5/5][TAKE2] ext4: write support for preallocated blocks Amit K. Arora
2007-05-15 6:31 ` [PATCH 0/5][TAKE2] fallocate system call Andreas Dilger
2007-05-15 12:40 ` Amit K. Arora
2007-05-15 19:37 ` [PATCH 0/5][TAKE3] " Amit K. Arora
[not found] ` <20070515195421.GA2948@amitarora.in.ibm.com>
2007-05-15 20:03 ` [PATCH 1/5][TAKE3] fallocate() implementation on i86, x86_64 and powerpc Amit K. Arora
2007-05-16 0:42 ` Mingming Cao
2007-05-16 12:31 ` Amit K. Arora
2007-05-16 3:16 ` David Chinner
2007-05-16 12:21 ` Dave Kleikamp
2007-05-16 12:37 ` Amit K. Arora
2007-05-16 23:40 ` David Chinner
2007-05-17 12:10 ` Dave Kleikamp
2007-05-17 12:28 ` Amit K. Arora
2007-05-15 20:10 ` [PATCH 2/5][TAKE3] fallocate() on s390 Amit K. Arora
2007-05-15 20:13 ` Amit K. Arora [this message]
2007-05-15 20:16 ` [PATCH 4/5][TAKE3] ext4: fallocate support in ext4 Amit K. Arora
2007-05-15 20:18 ` [PATCH 5/5][TAKE3] ext4: write support for preallocated blocks Amit K. Arora
2007-05-15 23:52 ` [PATCH 0/5][TAKE3] fallocate system call Mingming Cao
2007-05-17 14:11 ` [PATCH 0/6][TAKE4] " Amit K. Arora
[not found] ` <20070517141458.GA26641@amitarora.in.ibm.com>
2007-05-17 14:23 ` [PATCH 1/6][TAKE4] fallocate() implementation on i86, x86_64 and powerpc Amit K. Arora
2007-05-17 14:25 ` [PATCH 2/6][TAKE4] fallocate() on s390 Amit K. Arora
2007-05-17 14:25 ` [PATCH 3/6][TAKE4] fallocate() on ia64 Amit K. Arora
2007-05-17 14:26 ` [PATCH 4/6][TAKE4] ext4: Extent overlap bugfix Amit K. Arora
2007-05-17 14:29 ` [PATCH 5/6][TAKE4] ext4: fallocate support in ext4 Amit K. Arora
2007-05-17 14:30 ` [PATCH 6/6][TAKE4] ext4: write support for preallocated blocks Amit K. Arora
2007-05-19 6:44 ` [PATCH 0/6][TAKE4] fallocate system call Andrew Morton
2007-05-21 5:24 ` Mingming Cao
2007-03-30 7:19 ` Interface for the new fallocate() " Heiko Carstens
2007-03-30 9:15 ` Paul Mackerras
2007-03-30 10:44 ` Jörn Engel
2007-03-30 12:55 ` Heiko Carstens
2007-04-09 13:01 ` Paul Mackerras
2007-04-09 16:34 ` Jörn Engel
2007-03-17 5:33 ` [RFC][PATCH] sys_fallocate() " Stephen Rothwell
2007-03-19 9:30 ` Amit K. Arora
2007-03-17 14:53 ` Russell King
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