linux-toradex.git/include/linux/fs.h, branch v2.6.34

Cleanup generic block based fiemap

2010-04-23T17:39:48+00:00

This cleans up a few of the complaints of __generic_block_fiemap.  I've
fixed all the typing stuff, used inline functions instead of macros,
gotten rid of a couple of variables, and made sure the size and block
requests are all block aligned.  It also fixes a problem where sometimes
FIEMAP_EXTENT_LAST wasn't being set properly.

Signed-off-by: Josef Bacik 
Signed-off-by: Linus Torvalds

vfs: rename block_fsync() to blkdev_fsync()

2010-04-07T15:38:04+00:00

Requested by hch, for consistency now it is exported.

Cc: Alexander Viro 
Cc: Anton Blanchard 
Cc: Christoph Hellwig 
Cc: Jan Kara 
Cc: Jeff Moyer 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

raw: fsync method is now required

2010-04-07T15:38:04+00:00

Commit 148f948ba877f4d3cdef036b1ff6d9f68986706a (vfs: Introduce new
helpers for syncing after writing to O_SYNC file or IS_SYNC inode) broke
the raw driver.

We now call through generic_file_aio_write -> generic_write_sync ->
vfs_fsync_range.  vfs_fsync_range has:

        if (!fop || !fop->fsync) {
                ret = -EINVAL;
                goto out;
        }

But drivers/char/raw.c doesn't set an fsync method.

We have two options: fix it or remove the raw driver completely.  I'm
happy to do either, the fact this has been broken for so long suggests it
is rarely used.

The patch below adds an fsync method to the raw driver.  My knowledge of
the block layer is pretty sketchy so this could do with a once over.

If we instead decide to remove the raw driver, this patch might still be
useful as a backport to 2.6.33 and 2.6.32.

Signed-off-by: Anton Blanchard 
Reviewed-by: Jan Kara 
Cc: Christoph Hellwig 
Cc: Alexander Viro 
Cc: Jens Axboe 
Reviewed-by: Jeff Moyer 
Tested-by: Jeff Moyer 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

include/linux/fs.h: convert FMODE_* constants to hex

2010-03-06T19:26:25+00:00

It was tolerable until Eric went and added 8388608.

Cc: Eric Paris 
Cc: Wu Fengguang 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

readahead: introduce FMODE_RANDOM for POSIX_FADV_RANDOM

2010-03-06T19:26:25+00:00

This fixes inefficient page-by-page reads on POSIX_FADV_RANDOM.

POSIX_FADV_RANDOM used to set ra_pages=0, which leads to poor performance:
a 16K read will be carried out in 4 _sync_ 1-page reads.

In other places, ra_pages==0 means
- it's ramfs/tmpfs/hugetlbfs/sysfs/configfs
- some IO error happened
where multi-page read IO won't help or should be avoided.

POSIX_FADV_RANDOM actually want a different semantics: to disable the
*heuristic* readahead algorithm, and to use a dumb one which faithfully
submit read IO for whatever application requests.

So introduce a flag FMODE_RANDOM for POSIX_FADV_RANDOM.

Note that the random hint is not likely to help random reads performance
noticeably.  And it may be too permissive on huge request size (its IO
size is not limited by read_ahead_kb).

In Quentin's report (http://lkml.org/lkml/2009/12/24/145), the overall
(NFS read) performance of the application increased by 313%!

Tested-by: Quentin Barnes 
Signed-off-by: Wu Fengguang 
Cc: Nick Piggin 
Cc: Andi Kleen 
Cc: Steven Whitehouse 
Cc: David Howells 
Cc: Jonathan Corbet 
Cc: Al Viro 
Cc: Christoph Hellwig 
Cc: Trond Myklebust 
Cc: Chuck Lever 
Cc: 			[2.6.33.x]
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

pass writeback_control to ->write_inode

2010-03-05T18:25:52+00:00

This gives the filesystem more information about the writeback that
is happening.  Trond requested this for the NFS unstable write handling,
and other filesystems might benefit from this too by beeing able to
distinguish between the different callers in more detail.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Al Viro

vfs: add NOFOLLOW flag to umount(2)

2010-03-03T19:08:00+00:00

Add a new UMOUNT_NOFOLLOW flag to umount(2).  This is needed to prevent
symlink attacks in unprivileged unmounts (fuse, samba, ncpfs).

Additionally, return -EINVAL if an unknown flag is used (and specify
an explicitly unused flag: UMOUNT_UNUSED).  This makes it possible for
the caller to determine if a flag is supported or not.

CC: Eugene Teo 
CC: Michael Kerrisk 
Signed-off-by: Miklos Szeredi 
Signed-off-by: Al Viro

new helper: iterate_mounts()

2010-03-03T19:07:57+00:00

apply function to vfsmounts in set returned by collect_mounts(),
stop if it returns non-zero.

Signed-off-by: Al Viro

New helper: path_is_under(path1, path2)

2010-03-03T19:07:55+00:00

Analog of is_subdir for vfsmount,dentry pairs, moved from audit_tree.c

Signed-off-by: Al Viro

kill unused invalidate_inode_pages helper

2010-03-03T19:07:55+00:00

No one is calling this anymore as everyone has switched to
invalidate_mapping_pages long time ago.  Also update a few
references to it in comments.  nfs has two more, but I can't
easily figure what they are actually referring to, so I left
them as-is.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Al Viro