linux.git/fs/libfs.c, branch v2.6.27

VFS: increase pseudo-filesystem block size to PAGE_SIZE

2008-07-30T16:41:44+00:00

This commit:

    commit ba52de123d454b57369f291348266d86f4b35070
    Author: Theodore Ts'o 
    Date:   Wed Sep 27 01:50:49 2006 -0700

        [PATCH] inode-diet: Eliminate i_blksize from the inode structure

caused the block size used by pseudo-filesystems to decrease from
PAGE_SIZE to 1024 leading to a doubling of the number of context switches
during a kernbench run.

Signed-off-by: Alex Nixon 
Cc: Andi Kleen 
Cc: Jeremy Fitzhardinge 
Cc: Peter Zijlstra 
Cc: Ingo Molnar 
Cc: Ian Campbell 
Cc: "Theodore Ts'o" 
Cc: Alexander Viro 
Cc: Hugh Dickins 
Cc: Jens Axboe 
Cc: 		[2.6.25.x, 2.6.26.x]
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

add kernel-doc for simple_read_from_buffer and memory_read_from_buffer

2008-07-04T17:40:07+00:00

Add kernel-doc comments describing simple_read_from_buffer and
memory_read_from_buffer.

Signed-off-by: Akinobu Mita 
Cc: Christoph Hellwig 
Cc: "Randy.Dunlap" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

introduce memory_read_from_buffer()

2008-06-06T18:29:11+00:00

This patch introduces memory_read_from_buffer().

The only difference between memory_read_from_buffer() and
simple_read_from_buffer() is which address space the function copies to.

simple_read_from_buffer copies to user space memory.
memory_read_from_buffer copies to normal memory.

Signed-off-by: Akinobu Mita 
Cc: Al Viro 
Cc: Doug Warzecha 
Cc: Zhang Rui 
Cc: Matt Domsch 
Cc: Abhay Salunke 
Cc: Greg Kroah-Hartman 
Cc: Markus Rechberger 
Cc: Kay Sievers 
Cc: Bob Moore 
Cc: Thomas Renninger 
Cc: Len Brown 
Cc: Benjamin Herrenschmidt 
Cc: "Antonino A. Daplas" 
Cc: Krzysztof Helt 
Cc: Geert Uytterhoeven 
Cc: Martin Schwidefsky 
Cc: Heiko Carstens 
Cc: Peter Oberparleiter 
Cc: Michael Holzheu 
Cc: Brian King 
Cc: James E.J. Bottomley 
Cc: Andrew Vasquez 
Cc: Seokmann Ju 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

libfs: rename simple_attr_close to simple_attr_release

2008-02-08T17:22:34+00:00

simple_attr_close implementes ->release so it should be named accordingly.

Signed-off-by: Christoph Hellwig 
Cc: 
Cc: Arnd Bergmann 
Cc: Greg KH 
Cc: Al Viro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

libfs: make simple attributes interruptible

2008-02-08T17:22:34+00:00

Use mutex_lock_interruptible in simple_attr_read/write.

Signed-off-by: Christoph Hellwig 
Cc: 
Cc: Arnd Bergmann 
Cc: Greg KH 
Cc: Al Viro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

libfs: allow error return from simple attributes

2008-02-08T17:22:34+00:00

Sometimes simple attributes might need to return an error, e.g. for
acquiring a mutex interruptibly.  In fact we have that situation in
spufs already which is the original user of the simple attributes.  This
patch merged the temporarily forked attributes in spufs back into the
main ones and allows to return errors.

[akpm@linux-foundation.org: build fix]
Signed-off-by: Christoph Hellwig 
Cc: 
Cc: Arnd Bergmann 
Cc: Greg KH 
Cc: Al Viro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user

2008-02-05T17:44:13+00:00

Simplify page cache zeroing of segments of pages through 3 functions

zero_user_segments(page, start1, end1, start2, end2)

        Zeros two segments of the page. It takes the position where to
        start and end the zeroing which avoids length calculations and
	makes code clearer.

zero_user_segment(page, start, end)

        Same for a single segment.

zero_user(page, start, length)

        Length variant for the case where we know the length.

We remove the zero_user_page macro. Issues:

1. Its a macro. Inline functions are preferable.

2. The KM_USER0 macro is only defined for HIGHMEM.

   Having to treat this special case everywhere makes the
   code needlessly complex. The parameter for zeroing is always
   KM_USER0 except in one single case that we open code.

Avoiding KM_USER0 makes a lot of code not having to be dealing
with the special casing for HIGHMEM anymore. Dealing with
kmap is only necessary for HIGHMEM configurations. In those
configurations we use KM_USER0 like we do for a series of other
functions defined in highmem.h.

Since KM_USER0 is depends on HIGHMEM the existing zero_user_page
function could not be a macro. zero_user_* functions introduced
here can be be inline because that constant is not used when these
functions are called.

Also extract the flushing of the caches to be outside of the kmap.

[akpm@linux-foundation.org: fix nfs and ntfs build]
[akpm@linux-foundation.org: fix ntfs build some more]
Signed-off-by: Christoph Lameter 
Cc: Steven French 
Cc: Michael Halcrow 
Cc: 
Cc: Steven Whitehouse 
Cc: Trond Myklebust 
Cc: "J. Bruce Fields" 
Cc: Anton Altaparmakov 
Cc: Mark Fasheh 
Cc: David Chinner 
Cc: Michael Halcrow 
Cc: Steven French 
Cc: Steven Whitehouse 
Cc: Trond Myklebust 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

exportfs: add new methods

2007-10-22T15:13:19+00:00

Add the guts for the new filesystem API to exportfs.

There's now a fh_to_dentry method that returns a dentry for the object looked
for given a filehandle fragment, and a fh_to_parent operation that returns the
dentry for the encoded parent directory in case the file handle contains it.

There are default implementations for these methods that only take a callback
for an nfs-enhanced iget variant and implement the rest of the semantics.

Signed-off-by: Christoph Hellwig 
Cc: Neil Brown 
Cc: "J. Bruce Fields" 
Cc: 
Cc: Dave Kleikamp 
Cc: Anton Altaparmakov 
Cc: David Chinner 
Cc: Timothy Shimmin 
Cc: OGAWA Hirofumi 
Cc: Hugh Dickins 
Cc: Chris Mason 
Cc: Jeff Mahoney 
Cc: "Vladimir V. Saveliev" 
Cc: Steven Whitehouse 
Cc: Mark Fasheh 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

make fs/libfs.c:simple_commit_write() static

2007-10-17T15:42:53+00:00

simple_commit_write() can now become static.

Signed-off-by: Adrian Bunk 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs: introduce write_begin, write_end, and perform_write aops

2007-10-16T16:42:55+00:00

These are intended to replace prepare_write and commit_write with more
flexible alternatives that are also able to avoid the buffered write
deadlock problems efficiently (which prepare_write is unable to do).

[mark.fasheh@oracle.com: API design contributions, code review and fixes]
[akpm@linux-foundation.org: various fixes]
[dmonakhov@sw.ru: new aop block_write_begin fix]
Signed-off-by: Nick Piggin 
Signed-off-by: Mark Fasheh 
Signed-off-by: Dmitriy Monakhov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds