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-rw-r--r--Documentation/filesystems/ext4.txt19
1 files changed, 13 insertions, 6 deletions
diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt
index 1b7f9ac..34ea4f1 100644
--- a/Documentation/filesystems/ext4.txt
+++ b/Documentation/filesystems/ext4.txt
@@ -200,12 +200,9 @@ 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.
-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.
+nouser_xattr Disables Extended User Attributes. 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. If ACL support is enabled in the kernel
@@ -375,6 +372,16 @@ dioread_nolock locking. If the dioread_nolock option is specified
Because of the restrictions this options comprises
it is off by default (e.g. dioread_lock).
+max_dir_size_kb=n This limits the size of directories so that any
+ attempt to expand them beyond the specified
+ limit in kilobytes will cause an ENOSPC error.
+ This is useful in memory constrained
+ environments, where a very large directory can
+ cause severe performance problems or even
+ provoke the Out Of Memory killer. (For example,
+ if there is only 512mb memory available, a 176mb
+ directory may seriously cramp the system's style.)
+
i_version Enable 64-bit inode version support. This option is
off by default.