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authorJan Kara <jack@suse.cz>2009-09-29 15:59:34 -0400
committerTheodore Ts'o <tytso@mit.edu>2009-09-29 15:59:34 -0400
commit8365388827663bd6fb773e3623ed9023c0f82b1d (patch)
treee8f0166c3c17501c33375f9b1b70e702f7bbd65d /Documentation/filesystems
parent6d7f18f6ea3a13af95bdf507fc54d42b165e1712 (diff)
downloadtalos-op-linux-8365388827663bd6fb773e3623ed9023c0f82b1d.tar.gz
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ext4: Update documentation about quota mount options
Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/ext4.txt13
1 files changed, 10 insertions, 3 deletions
diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt
index 18b5ec8cea45..bf4f4b7e11b3 100644
--- a/Documentation/filesystems/ext4.txt
+++ b/Documentation/filesystems/ext4.txt
@@ -282,9 +282,16 @@ 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
disks * RAID chunk size in file system blocks.
-delalloc (*) Deferring block allocation until write-out time.
-nodelalloc Disable delayed allocation. Blocks are allocation
- when data is copied from user to page cache.
+
+delalloc (*) Defer block allocation until just before ext4
+ writes out the block(s) in question. This
+ allows ext4 to better allocation decisions
+ more efficiently.
+nodelalloc Disable delayed allocation. Blocks are allocated
+ when the data is copied from userspace to the
+ page cache, either via the write(2) system call
+ or when an mmap'ed page which was previously
+ unallocated is written for the first time.
max_batch_time=usec Maximum amount of time ext4 should wait for
additional filesystem operations to be batch
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