linux.git/fs/ext4/migrate.c, branch v2.6.26

ext4: move headers out of include/linux

2008-04-29T22:13:32+00:00

Move ext4 headers out of include/linux.  This is just the trivial move,
there's some more thing that could be done later. 

Signed-off-by: Christoph Hellwig 
Signed-off-by: Mingming Cao 
Signed-off-by: "Theodore Ts'o"

ext4: Fix race between migration and mmap write

2008-04-29T12:11:12+00:00

Fail migrate if we allocated new blocks via mmap write.

If we write to holes in the file via mmap, we end up allocating
new blocks. This block allocation happens without taking inode->i_mutex.
Since migrate is protected by i_mutex and migrate expects that no
new blocks get allocated during migrate, fail migrate if new blocks
get allocated.

We can't take inode->i_mutex in the mmap write path because that
would result in a locking order violation between i_mutex and mmap_sem.
Also adding a separate rw_sempahore for protection is really high overhead
for a rare operation such as migrate.

Signed-off-by: Aneesh Kumar K.V 
Acked-by: Jan Kara 
Signed-off-by: "Theodore Ts'o"

ext4: Fix memory and buffer head leak in callers to ext4_ext_find_extent()

2008-02-25T21:54:37+00:00

The path variable returned via ext4_ext_find_extent is a kmalloc
variable and needs to be freeded.  It also contains a reference to
buffer_head which needs to be dropped.

Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Mingming Cao 
Signed-off-by: "Theodore Ts'o"

ext4: Fix circular locking dependency with migrate and rm.

2008-02-10T06:20:05+00:00

In order to prevent a circular locking dependency when an unlink
operation is racing with an ext4 migration, we delay taking i_data_sem
until just before switch the inode format, and use i_mutex to prevent
writes and truncates during the first part of the migration operation.

Acked-by: Jan Kara 
Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Mingming Cao 
Signed-off-by: "Theodore Ts'o"

ext4: Don't set EXTENTS_FL flag for fast symlinks

2008-02-05T15:56:37+00:00

For fast symbolic links, the file content is stored in the i_block[]
array, which is not compatible with the new file extents format.
e2fsck reports error on such files because EXTENTS_FL is set.
Don't set the EXTENTS_FL flag when creating fast symlinks.

In the case of file migration, skip fast symbolic links.

Signed-off-by: Valerie Clement 
Signed-off-by: Mingming Cao 
Signed-off-by: "Theodore Ts'o"

ext4: Add multi block allocator for ext4

2008-01-29T05:19:52+00:00

Signed-off-by: Alex Tomas 
Signed-off-by: Andreas Dilger 
Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Eric Sandeen 
Signed-off-by: "Theodore Ts'o"

ext4: Add EXT4_IOC_MIGRATE ioctl

2008-01-29T04:58:26+00:00

The below patch add ioctl for migrating ext3 indirect block mapped inode
to ext4 extent mapped inode.

Signed-off-by: Aneesh Kumar K.V