linux.git/fs/ext4/ioctl.c, branch v3.17

ext4: clean up error handling in swap_inode_boot_loader()

2014-02-18T01:44:36+00:00

Tighten up the code to make the code easier to read and maintain.

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

ext4: fix error paths in swap_inode_boot_loader()

2014-02-12T16:48:31+00:00

In swap_inode_boot_loader() we forgot to release ->i_mutex and resume
unlocked dio for inode and inode_bl if there is an error starting the
journal handle.  This commit fixes this issue.

Reported-by: Ahmed Tamrawi 
Cc: Andreas Dilger 
Cc: Dr. Tilmann Bubeck 
Signed-off-by: Zheng Liu 
Signed-off-by: "Theodore Ts'o" 
Cc: stable@vger.kernel.org  # v3.10+

ext4: delete "set but not used" variables

2014-01-11T18:26:56+00:00

Signed-off-by: Jon Ernst 
Signed-off-by: "Theodore Ts'o" 
Reviewed-by: Zheng Liu

vfs: pull ext4's double-i_mutex-locking into common code

2013-11-09T05:16:39+00:00

We want to do this elsewhere as well.

Also catch any attempts to use it for directories (where this ordering
would conflict with ancestor-first directory ordering in lock_rename).

Cc: Andreas Dilger 
Cc: Dave Chinner 
Acked-by: Jeff Layton 
Acked-by: "Theodore Ts'o" 
Signed-off-by: J. Bruce Fields 
Signed-off-by: Al Viro

ext4: isolate ext4_extents.h file

2013-08-28T18:47:06+00:00

After applied the commit (4a092d73), we have reduced the number of
source files that need to #include ext4_extents.h.  But we can do
better.

This commit defines ext4_zeroout_es() in extents.c and move
EXT_MAX_BLOCKS into ext4.h in order not to include ext4_extents.h in
indirect.c and ioctl.c.  Meanwhile we just need to include this file in
extent_status.c when ES_AGGRESSIVE_TEST is defined.  Otherwise, this
commit removes a duplicated declaration in trace/events/ext4.h.

After applied this patch, we just need to include ext4_extents.h file
in {super,migrate,move_extents,extents}.c, and it is easy for us to
define a new extent disk layout.

Signed-off-by: Zheng Liu 
Signed-off-by: "Theodore Ts'o"

ext4: add support for extent pre-caching

2013-08-17T02:05:14+00:00

Add a new fiemap flag which forces the all of the extents in an inode
to be cached in the extent_status tree.  This is critically important
when using AIO to a preallocated file, since if we need to read in
blocks from the extent tree, the io_submit(2) system call becomes
synchronous, and the AIO is no longer "A", which is bad.

In addition, for most files which have an external leaf tree block,
the cost of caching the information in the extent status tree will be
less than caching the entire 4k block in the buffer cache.  So it is
generally a win to keep the extent information cached.

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

ext4: flush the extent status cache during EXT4_IOC_SWAP_BOOT

2013-08-12T13:29:30+00:00

Previously we weren't swapping only some of the extent_status LRU
fields during the processing of the EXT4_IOC_SWAP_BOOT ioctl.  The
much safer thing to do is to just completely flush the extent status
tree when doing the swap.

Signed-off-by: "Theodore Ts'o" 
Cc: Zheng Liu 
Cc: stable@vger.kernel.org

ext4: fix usless declarations

2013-04-10T02:48:36+00:00

This patch should fix sparse complains about shadow declatations.

Signed-off-by: Dmitry Monakhov 
Signed-off-by: "Theodore Ts'o"

ext4: implementation of a new ioctl called EXT4_IOC_SWAP_BOOT

2013-04-08T16:54:05+00:00

Add a new ioctl, EXT4_IOC_SWAP_BOOT which swaps i_blocks and
associated attributes (like i_blocks, i_size, i_flags, ...) from the
specified inode with inode EXT4_BOOT_LOADER_INO (#5). This is
typically used to store a boot loader in a secure part of the
filesystem, where it can't be changed by a normal user by accident.
The data blocks of the previous boot loader will be associated with
the given inode.

This usercode program is a simple example of the usage:

int main(int argc, char *argv[])
{
  int fd;
  int err;

  if ( argc != 2 ) {
    printf("usage: ext4-swap-boot-inode FILE-TO-SWAP\n");
    exit(1);
  }

  fd = open(argv[1], O_WRONLY);
  if ( fd < 0 ) {
    perror("open");
    exit(1);
  }

  err = ioctl(fd, EXT4_IOC_SWAP_BOOT);
  if ( err < 0 ) {
    perror("ioctl");
    exit(1);
  }

  close(fd);
  exit(0);
}

[ Modified by Theodore Ts'o to fix a number of bugs in the original code.]

Signed-off-by: Dr. Tilmann Bubeck 
Signed-off-by: "Theodore Ts'o"

ext4: support simple conversion of extent-mapped inodes to use i_blocks

2013-04-04T02:04:52+00:00

In order to make it simpler to test the code which support
i_blocks/indirect-mapped inodes, support the conversion of inodes
which are less than 12 blocks and which are contained in no more than
a single extent.

The primary intended use of this code is to converting freshly created
zero-length files and empty directories.

Note that the version of chattr in e2fsprogs 1.42.7 and earlier has a
check that prevents the clearing of the extent flag.  A simple patch
which allows "chattr -e " to work will be checked into the
e2fsprogs git repository.

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