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-rw-r--r--Documentation/admin-guide/ext4.rst23
1 files changed, 13 insertions, 10 deletions
diff --git a/Documentation/admin-guide/ext4.rst b/Documentation/admin-guide/ext4.rst
index a683976fad6d..d2795ca6821e 100644
--- a/Documentation/admin-guide/ext4.rst
+++ b/Documentation/admin-guide/ext4.rst
@@ -489,6 +489,9 @@ Files in /sys/fs/ext4/<devname>:
multiple of this tuning parameter if the stripe size is not set in the
ext4 superblock
+ mb_max_inode_prealloc
+ The maximum length of per-inode ext4_prealloc_space list.
+
mb_max_to_scan
The maximum number of extents the multiblock allocator will search to
find the best extent.
@@ -529,21 +532,21 @@ Files in /sys/fs/ext4/<devname>:
Ioctls
======
-There is some Ext4 specific functionality which can be accessed by applications
-through the system call interfaces. The list of all Ext4 specific ioctls are
-shown in the table below.
+Ext4 implements various ioctls which can be used by applications to access
+ext4-specific functionality. An incomplete list of these ioctls is shown in the
+table below. This list includes truly ext4-specific ioctls (``EXT4_IOC_*``) as
+well as ioctls that may have been ext4-specific originally but are now supported
+by some other filesystem(s) too (``FS_IOC_*``).
-Table of Ext4 specific ioctls
+Table of Ext4 ioctls
- EXT4_IOC_GETFLAGS
+ FS_IOC_GETFLAGS
Get additional attributes associated with inode. The ioctl argument is
- an integer bitfield, with bit values described in ext4.h. This ioctl is
- an alias for FS_IOC_GETFLAGS.
+ an integer bitfield, with bit values described in ext4.h.
- EXT4_IOC_SETFLAGS
+ FS_IOC_SETFLAGS
Set additional attributes associated with inode. The ioctl argument is
- an integer bitfield, with bit values described in ext4.h. This ioctl is
- an alias for FS_IOC_SETFLAGS.
+ an integer bitfield, with bit values described in ext4.h.
EXT4_IOC_GETVERSION, EXT4_IOC_GETVERSION_OLD
Get the inode i_generation number stored for each inode. The