path: root/Documentation
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authorLinus Torvalds <torvalds@linux-foundation.org>2008-10-17 15:08:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-17 15:08:11 -0700
commit58617d5e59663d2edea03bd03cb74279827611bb (patch)
tree1b472f0ab43ae08fef5dea30b95592a005385686 /Documentation
parent26e9a397774a0e94efbb8a0bf4a952c28d808cab (diff)
parentf287a1a56130be5fdb96a4a62d1290bd064f308e (diff)
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: ext4: Remove automatic enabling of the HUGE_FILE feature flag ext4: Replace hackish ext4_mb_poll_new_transaction with commit callback ext4: Update Documentation/filesystems/ext4.txt ext4: Remove unused mount options: nomballoc, mballoc, nocheck ext4: Remove compile warnings when building w/o CONFIG_PROC_FS ext4: Add missing newlines to printk messages ext4: Fix file fragmentation during large file write. vfs: Add no_nrwrite_index_update writeback control flag vfs: Remove the range_cont writeback mode. ext4: Use tag dirty lookup during mpage_da_submit_io ext4: let the block device know when unused blocks can be discarded ext4: Don't reuse released data blocks until transaction commits ext4: Use an rbtree for tracking blocks freed during transaction. ext4: Do mballoc init before doing filesystem recovery ext4: Free ext4_prealloc_space using kmem_cache_free ext4: Fix Kconfig typo for ext4dev ext4: Remove an old reference to ext4dev in Makefile comment
Diffstat (limited to 'Documentation')
1 files changed, 15 insertions, 17 deletions
diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt
index eb154ef36c2..174eaff7ded 100644
--- a/Documentation/filesystems/ext4.txt
+++ b/Documentation/filesystems/ext4.txt
@@ -2,19 +2,24 @@
Ext4 Filesystem
-This is a development version of the ext4 filesystem, an advanced level
-of the ext3 filesystem which incorporates scalability and reliability
-enhancements for supporting large filesystems (64 bit) in keeping with
-increasing disk capacities and state-of-the-art feature requirements.
+Ext4 is an an advanced level of the ext3 filesystem which incorporates
+scalability and reliability enhancements for supporting large filesystems
+(64 bit) in keeping with increasing disk capacities and state-of-the-art
+feature requirements.
-Mailing list: linux-ext4@vger.kernel.org
+Mailing list: linux-ext4@vger.kernel.org
+Web site: http://ext4.wiki.kernel.org
1. Quick usage instructions:
+Note: More extensive information for getting started with ext4 can be
+ found at the ext4 wiki site at the URL:
+ http://ext4.wiki.kernel.org/index.php/Ext4_Howto
- Compile and install the latest version of e2fsprogs (as of this
- writing version 1.41) from:
+ writing version 1.41.3) from:
@@ -36,11 +41,9 @@ Mailing list: linux-ext4@vger.kernel.org
# mke2fs -t ext4 /dev/hda1
- Or configure an existing ext3 filesystem to support extents and set
- the test_fs flag to indicate that it's ok for an in-development
- filesystem to touch this filesystem:
+ Or to configure an existing ext3 filesystem to support extents:
- # tune2fs -O extents -E test_fs /dev/hda1
+ # tune2fs -O extents /dev/hda1
If the filesystem was created with 128 byte inodes, it can be
converted to use 256 byte for greater efficiency via:
@@ -104,8 +107,8 @@ exist yet so I'm not sure they're in the near-term roadmap.
The big performance win will come with mballoc, delalloc and flex_bg
grouping of bitmaps and inode tables. Some test results available here:
- - http://www.bullopensource.org/ext4/20080530/ffsb-write-2.6.26-rc2.html
- - http://www.bullopensource.org/ext4/20080530/ffsb-readwrite-2.6.26-rc2.html
+ - http://www.bullopensource.org/ext4/20080818-ffsb/ffsb-write-2.6.27-rc1.html
+ - http://www.bullopensource.org/ext4/20080818-ffsb/ffsb-readwrite-2.6.27-rc1.html
3. Options
@@ -214,9 +217,6 @@ noreservation
bsddf (*) Make 'df' act like BSD.
minixdf Make 'df' act like Minix.
-check=none Don't do extra checking of bitmaps on mount.
debug Extra debugging information is sent to syslog.
errors=remount-ro(*) Remount the filesystem read-only on an error.
@@ -253,8 +253,6 @@ nobh (a) cache disk block mapping information
"nobh" option tries to avoid associating buffer
heads (supported only for "writeback" mode).
-mballoc (*) Use the multiple block allocator for block allocation
-nomballoc disabled multiple block allocator for block allocation.
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