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authorLinus Torvalds <torvalds@linux-foundation.org>2011-11-02 10:06:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-11-02 10:06:20 -0700
commitf1f8935a5c38a2c61e86a42bc971a2539eef2211 (patch)
tree694950045f2f5d89507d7206cf6595e09cdfbd2c /Documentation/filesystems
parent34116645d912f65d7eb4508a1db3c9d0e45facb1 (diff)
parentf2a44523b20f323e4aef7c16261d34d6f0a4bf06 (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: (97 commits) jbd2: Unify log messages in jbd2 code jbd/jbd2: validate sb->s_first in journal_get_superblock() ext4: let ext4_ext_rm_leaf work with EXT_DEBUG defined ext4: fix a syntax error in ext4_ext_insert_extent when debugging enabled ext4: fix a typo in struct ext4_allocation_context ext4: Don't normalize an falloc request if it can fit in 1 extent. ext4: remove comments about extent mount option in ext4_new_inode() ext4: let ext4_discard_partial_buffers handle unaligned range correctly ext4: return ENOMEM if find_or_create_pages fails ext4: move vars to local scope in ext4_discard_partial_page_buffers_no_lock() ext4: Create helper function for EXT4_IO_END_UNWRITTEN and i_aiodio_unwritten ext4: optimize locking for end_io extent conversion ext4: remove unnecessary call to waitqueue_active() ext4: Use correct locking for ext4_end_io_nolock() ext4: fix race in xattr block allocation path ext4: trace punch_hole correctly in ext4_ext_map_blocks ext4: clean up AGGRESSIVE_TEST code ext4: move variables to their scope ext4: fix quota accounting during migration ext4: migrate cleanup ...
Diffstat (limited to 'Documentation/filesystems')
-rw-r--r--Documentation/filesystems/ext4.txt41
1 files changed, 16 insertions, 25 deletions
diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt
index 232a575a0c4..4917cf24a5e 100644
--- a/Documentation/filesystems/ext4.txt
+++ b/Documentation/filesystems/ext4.txt
@@ -160,7 +160,9 @@ noload if the filesystem was not unmounted cleanly,
lead to any number of problems.
data=journal All data are committed into the journal prior to being
- written into the main file system.
+ written into the main file system. Enabling
+ this mode will disable delayed allocation and
+ O_DIRECT support.
data=ordered (*) All data are forced directly out to the main file
system prior to its metadata being committed to the
@@ -201,30 +203,19 @@ inode_readahead_blks=n This tuning parameter controls the maximum
table readahead algorithm will pre-read into
the buffer cache. The default value is 32 blocks.
-orlov (*) This enables the new Orlov block allocator. It is
- enabled by default.
-
-oldalloc This disables the Orlov block allocator and enables
- the old block allocator. Orlov should have better
- performance - we'd like to get some feedback if it's
- the contrary for you.
-
-user_xattr Enables Extended User Attributes. Additionally, you
- need to have extended attribute support enabled in the
- kernel configuration (CONFIG_EXT4_FS_XATTR). See the
- attr(5) manual page and http://acl.bestbits.at/ to
- learn more about extended attributes.
-
-nouser_xattr Disables Extended User Attributes.
-
-acl Enables POSIX Access Control Lists support.
- Additionally, you need to have ACL support enabled in
- the kernel configuration (CONFIG_EXT4_FS_POSIX_ACL).
- See the acl(5) manual page and http://acl.bestbits.at/
- for more information.
+nouser_xattr Disables Extended User Attributes. If you have extended
+ attribute support enabled in the kernel configuration
+ (CONFIG_EXT4_FS_XATTR), extended attribute support
+ is enabled by default on mount. See the attr(5) manual
+ page and http://acl.bestbits.at/ for more information
+ about extended attributes.
noacl This option disables POSIX Access Control List
- support.
+ support. If ACL support is enabled in the kernel
+ configuration (CONFIG_EXT4_FS_POSIX_ACL), ACL is
+ enabled by default on mount. See the acl(5) manual
+ page and http://acl.bestbits.at/ for more information
+ about acl.
bsddf (*) Make 'df' act like BSD.
minixdf Make 'df' act like Minix.
@@ -419,8 +410,8 @@ written to the journal first, and then to its final location.
In the event of a crash, the journal can be replayed, bringing both data and
metadata into a consistent state. This mode is the slowest except when data
needs to be read from and written to disk at the same time where it
-outperforms all others modes. Currently ext4 does not have delayed
-allocation support if this data journalling mode is selected.
+outperforms all others modes. Enabling this mode will disable delayed
+allocation and O_DIRECT support.
/proc entries
=============