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authorLinus Torvalds <torvalds@linux-foundation.org>2011-07-26 11:34:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-07-26 11:34:40 -0700
commit2ac232f37fa0e8551856a575fe299c47b65b4d66 (patch)
tree58ff15ecdbc383415a82ea678e5191db16a479f3 /Documentation/filesystems
parentfa8f53ace4af9470d8414427cb3dc3c0ffc4f182 (diff)
parent5cf49d763eb141d236e92be6d4a0dc94e31fa886 (diff)
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6: jbd: change the field "b_cow_tid" of struct journal_head from type unsigned to tid_t ext3.txt: update the links in the section "useful links" to the latest ones ext3: Fix data corruption in inodes with journalled data ext2: check xattr name_len before acquiring xattr_sem in ext2_xattr_get ext3: Fix compilation with -DDX_DEBUG quota: Remove unused declaration jbd: Use WRITE_SYNC in journal checkpoint. jbd: Fix oops in journal_remove_journal_head() ext3: Return -EINVAL when start is beyond the end of fs in ext3_trim_fs() ext3/ioctl.c: silence sparse warnings about different address spaces ext3/ext4 Documentation: remove bh/nobh since it has been deprecated ext3: Improve truncate error handling ext3: use proper little-endian bitops ext2: include fs.h into ext2_fs.h ext3: Fix oops in ext3_try_to_allocate_with_rsv() jbd: fix a bug of leaking jh->b_jcount jbd: remove dependency on __GFP_NOFAIL ext3: Convert ext3 to new truncate calling convention jbd: Add fixed tracepoints ext3: Add fixed tracepoints Resolve conflicts in fs/ext3/fsync.c due to fsync locking push-down and new fixed tracepoints.
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/ext3.txt13
-rw-r--r--Documentation/filesystems/ext4.txt23
2 files changed, 9 insertions, 27 deletions
diff --git a/Documentation/filesystems/ext3.txt b/Documentation/filesystems/ext3.txt
index 272f80d5f96..22f3a0eda1d 100644
--- a/Documentation/filesystems/ext3.txt
+++ b/Documentation/filesystems/ext3.txt
@@ -147,15 +147,6 @@ grpjquota=<file> during journal replay. They replace the above
package for more details
(http://sourceforge.net/projects/linuxquota).
-bh (*) ext3 associates buffer heads to data pages to
-nobh (a) cache disk block mapping information
- (b) link pages into transaction to provide
- ordering guarantees.
- "bh" option forces use of buffer heads.
- "nobh" option tries to avoid associating buffer
- heads (supported only for "writeback" mode).
-
-
Specification
=============
Ext3 shares all disk implementation with the ext2 filesystem, and adds
@@ -227,5 +218,5 @@ kernel source: <file:fs/ext3/>
programs: http://e2fsprogs.sourceforge.net/
http://ext2resize.sourceforge.net
-useful links: http://www.ibm.com/developerworks/library/l-fs7.html
- http://www.ibm.com/developerworks/library/l-fs8.html
+useful links: http://www.ibm.com/developerworks/library/l-fs7/index.html
+ http://www.ibm.com/developerworks/library/l-fs8/index.html
diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt
index 3ae9bc94352..232a575a0c4 100644
--- a/Documentation/filesystems/ext4.txt
+++ b/Documentation/filesystems/ext4.txt
@@ -68,12 +68,12 @@ Note: More extensive information for getting started with ext4 can be
'-o barriers=[0|1]' mount option for both ext3 and ext4 filesystems
for a fair comparison. When tuning ext3 for best benchmark numbers,
it is often worthwhile to try changing the data journaling mode; '-o
- data=writeback,nobh' can be faster for some workloads. (Note
- however that running mounted with data=writeback can potentially
- leave stale data exposed in recently written files in case of an
- unclean shutdown, which could be a security exposure in some
- situations.) Configuring the filesystem with a large journal can
- also be helpful for metadata-intensive workloads.
+ data=writeback' can be faster for some workloads. (Note however that
+ running mounted with data=writeback can potentially leave stale data
+ exposed in recently written files in case of an unclean shutdown,
+ which could be a security exposure in some situations.) Configuring
+ the filesystem with a large journal can also be helpful for
+ metadata-intensive workloads.
2. Features
===========
@@ -272,14 +272,6 @@ grpjquota=<file> during journal replay. They replace the above
package for more details
(http://sourceforge.net/projects/linuxquota).
-bh (*) ext4 associates buffer heads to data pages to
-nobh (a) cache disk block mapping information
- (b) link pages into transaction to provide
- ordering guarantees.
- "bh" option forces use of buffer heads.
- "nobh" option tries to avoid associating buffer
- heads (supported only for "writeback" mode).
-
stripe=n Number of filesystem blocks that mballoc will try
to use for allocation size and alignment. For RAID5/6
systems this should be the number of data
@@ -393,8 +385,7 @@ dioread_nolock locking. If the dioread_nolock option is specified
write and convert the extent to initialized after IO
completes. This approach allows ext4 code to avoid
using inode mutex, which improves scalability on high
- speed storages. However this does not work with nobh
- option and the mount will fail. Nor does it work with
+ speed storages. However this does not work with
data journaling and dioread_nolock option will be
ignored with kernel warning. Note that dioread_nolock
code path is only used for extent-based files.