linux-toradex.git/fs/ext4/xattr.h, branch v3.8.3

ext4: zero out inline data using memset() instead of empty_zero_page

2012-12-11T08:31:49+00:00

Not all architectures (in particular, sparc64) have empty_zero_page.
So instead of copying from empty_zero_page, use memset to clear the
inline data by signalling to ext4_xattr_set_entry() via a magic
pointer value, EXT4_ZERO_ATTR_VALUE, which is defined by casting -1 to
a pointer.

This fixes a build failure on sparc64, and the memset() should be more
efficient than using memcpy() anyway.

Signed-off-by: Tao Ma 
Signed-off-by: "Theodore Ts'o"

ext4: Remove CONFIG_EXT4_FS_XATTR

2012-12-10T21:30:43+00:00

Ted has sent out a RFC about removing this feature. Eric and Jan
confirmed that both RedHat and SUSE enable this feature in all their
product.  David also said that "As far as I know, it's enabled in all
Android kernels that use ext4."  So it seems OK for us.

And what's more, as inline data depends its implementation on xattr,
and to be frank, I don't run any test again inline data enabled while
xattr disabled.  So I think we should add inline data and remove this
config option in the same release.

[ The savings if you disable CONFIG_EXT4_FS_XATTR is only 27k, which
  isn't much in the grand scheme of things.  Since no one seems to be
  testing this configuration except for some automated compile farms, on
  balance we are better removing this config option, and so that it is
  effectively always enabled. -- tytso ]

Cc: David Brown 
Cc: Eric Sandeen 
Reviewed-by: Jan Kara 
Signed-off-by: Tao Ma 
Signed-off-by: "Theodore Ts'o"

ext4: let fallocate handle inline data correctly

2012-12-10T19:06:03+00:00

If we are punching hole in a file, we will return ENOTSUPP.
As for the fallocation of some extents, we will convert the
inline data to a normal extent based file first.

Signed-off-by: Tao Ma 
Signed-off-by: "Theodore Ts'o"

ext4: let ext4_truncate handle inline data correctly

2012-12-10T19:06:02+00:00

Signed-off-by: Robin Dong 
Signed-off-by: Tao Ma 
Signed-off-by: "Theodore Ts'o"

ext4: evict inline data out if we need to strore xattr in inode

2012-12-10T19:06:02+00:00

Now we that store data in the inode, in case we need to store some
xattrs and inode doesn't have enough space, Andreas suggested that we
should keep the xattr(metadata) in and data should be pushed out.  So
this patch does the work.

Signed-off-by: Tao Ma 
Signed-off-by: "Theodore Ts'o"

ext4: let fiemap work with inline data

2012-12-10T19:06:02+00:00

fiemap is used to find the disk layout of a file, as for inline data,
let us just pretend like a file with just one extent.

Signed-off-by: Tao Ma 
Signed-off-by: "Theodore Ts'o"

ext4: let ext4_rename handle inline dir

2012-12-10T19:06:01+00:00

In case we rename a directory, ext4_rename has to read the dir block
and change its dotdot's information.  The old ext4_rename encapsulated
the dir_block read into itself.  So this patch adds a new function
ext4_get_first_dir_block() which gets the dir buffer information so
the ext4_rename can handle it properly.  As it will also change the
parent inode number, we return the parent_de so that ext4_rename() can
handle it more easily.

ext4_find_entry is also changed so that the caller(rename) can tell
whether the found entry is an inlined one or not and journaling the
corresponding buffer head.

Signed-off-by: Tao Ma 
Signed-off-by: "Theodore Ts'o"

ext4: let empty_dir handle inline dir

2012-12-10T19:06:01+00:00

empty_dir is used when deleting a dir.  So it should handle inline dir
properly.

Signed-off-by: Tao Ma 
Signed-off-by: "Theodore Ts'o"

ext4: let ext4_delete_entry() handle inline data

2012-12-10T19:06:00+00:00

Signed-off-by: Tao Ma 
Signed-off-by: "Theodore Ts'o"

ext4: let ext4_find_entry handle inline data

2012-12-10T19:06:00+00:00

Create a new function ext4_find_inline_entry() to handle the case of
inline data.

Signed-off-by: Tao Ma 
Signed-off-by: "Theodore Ts'o"