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authorLinus Torvalds <torvalds@linux-foundation.org>2010-05-21 10:50:28 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-21 10:50:28 -0700
commit7ce1418f95e918cfc5ad36e3ec3431145c768cd0 (patch)
tree10fd5bf66a5d0cb71cbf0ffb17b354969a7cc4c4 /Documentation
parenta6f039869ff87e0a8d621e31d14bbb120c1dfa93 (diff)
parent1907131bbeabb33db313bad34f3ec1a5faedbd64 (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: (31 commits) dquot: Detect partial write error to quota file in write_blk() and add printk_ratelimit for quota error messages ocfs2: Fix lock inversion in quotas during umount ocfs2: Use __dquot_transfer to avoid lock inversion ocfs2: Fix NULL pointer deref when writing local dquot ocfs2: Fix estimate of credits needed for quota allocation ocfs2: Fix quota locking ocfs2: Avoid unnecessary block mapping when refreshing quota info ocfs2: Do not map blocks from local quota file on each write quota: Refactor dquot_transfer code so that OCFS2 can pass in its references quota: unify quota init condition in setattr quota: remove sb_has_quota_active in get/set_info quota: unify ->set_dqblk quota: unify ->get_dqblk ext3: make barrier options consistent with ext4 quota: Make quota stat accounting lockless. suppress warning: "quotatypes" defined but not used ext3: Fix waiting on transaction during fsync jbd: Provide function to check whether transaction will issue data barrier ufs: add ufs speciffic ->setattr call BKL: Remove BKL from ext2 filesystem ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/filesystems/ext3.txt15
1 files changed, 13 insertions, 2 deletions
diff --git a/Documentation/filesystems/ext3.txt b/Documentation/filesystems/ext3.txt
index 867c5b50cb42..272f80d5f966 100644
--- a/Documentation/filesystems/ext3.txt
+++ b/Documentation/filesystems/ext3.txt
@@ -59,8 +59,19 @@ commit=nrsec (*) Ext3 can be told to sync all its data and metadata
Setting it to very large values will improve
performance.
-barrier=1 This enables/disables barriers. barrier=0 disables
- it, barrier=1 enables it.
+barrier=<0(*)|1> This enables/disables the use of write barriers in
+barrier the jbd code. barrier=0 disables, barrier=1 enables.
+nobarrier (*) This also requires an IO stack which can support
+ barriers, and if jbd gets an error on a barrier
+ write, it will disable again with a warning.
+ Write barriers enforce proper on-disk ordering
+ of journal commits, making volatile disk write caches
+ safe to use, at some performance penalty. If
+ your disks are battery-backed in one way or another,
+ disabling barriers may safely improve performance.
+ The mount options "barrier" and "nobarrier" can
+ also be used to enable or disable barriers, for
+ consistency with other ext3 mount options.
orlov (*) This enables the new Orlov block allocator. It is
enabled by default.