lwn.git/fs/hpfs, branch v3.14.5

hpfs: optimize quad buffer loading

2014-02-03T00:24:07+00:00

HPFS needs to load 4 consecutive 512-byte sectors when accessing the directory nodes or bitmaps. We can't switch to 2048-byte block size because files are allocated in the units of 512-byte sectors. Previously, the driver would allocate a 2048-byte area using kmalloc, copy the data from four buffers to this area and eventually copy them back if they were modified. In the current implementation of the buffer cache, buffers are allocated in the pagecache. That means that 4 consecutive 512-byte buffers are stored in consecutive areas in the kernel address space. So, we don't need to allocate extra memory and copy the content of the buffers there. This patch optimizes the code to avoid copying the buffers. It checks if the four buffers are stored in contiguous memory - if they are not, it falls back to allocating a 2048-byte area and copying data there. Signed-off-by: Mikulas Patocka Signed-off-by: Linus Torvalds

hpfs: remember free space

2014-02-03T00:24:07+00:00

Previously, hpfs scanned all bitmaps each time the user asked for free space using statfs. This patch changes it so that hpfs scans the bitmaps only once, remembes the free space and on next invocation of statfs it returns the value instantly. New versions of wine are hammering on the statfs syscall very heavily, making some games unplayable when they're stored on hpfs, with load times in minutes. This should be backported to the stable kernels because it fixes user-visible problem (excessive level load times in wine). Signed-off-by: Mikulas Patocka Cc: stable@vger.kernel.org Signed-off-by: Linus Torvalds

locks: break delegations on any attribute modification

2013-11-09T05:16:44+00:00

NFSv4 uses leases to guarantee that clients can cache metadata as well as data. Cc: Mikulas Patocka Cc: David Howells Cc: Tyler Hicks Cc: Dustin Kirkland Acked-by: Jeff Layton Signed-off-by: J. Bruce Fields Signed-off-by: Al Viro

hpfs: make freeing sbi and codetables rcu-delayed

2013-10-25T03:43:26+00:00

makes ->d_hash() and ->d_compare() safety in RCU mode independent from vfsmount_lock Signed-off-by: Al Viro

truncate: drop 'oldsize' truncate_pagecache() parameter

2013-09-12T22:38:02+00:00

truncate_pagecache() doesn't care about old size since commit cedabed49b39 ("vfs: Fix vmtruncate() regression"). Let's drop it. Signed-off-by: Kirill A. Shutemov Cc: OGAWA Hirofumi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Merge branch 'hpfs' from Mikulas Patocka

2013-07-04T18:22:55+00:00

Merge hpfs patches from Mikulas Patocka. * emailed patches from Mikulas Patocka : hpfs: implement prefetch to improve performance hpfs: use mpage hpfs: better test for errors

hpfs: implement prefetch to improve performance

2013-07-04T18:22:46+00:00

This patch implements prefetch to improve performance. It helps mostly when scanning the bitmaps to calculate free space. Signed-off-by: Mikulas Patocka Signed-off-by: Linus Torvalds

hpfs: use mpage

2013-07-04T18:22:46+00:00

Use the mpage interface to improve performance. Signed-off-by: Mikulas Patocka Signed-off-by: Linus Torvalds

hpfs: better test for errors

2013-07-04T18:22:46+00:00

The test if bitmap access is out of bound could errorneously pass if the device size is divisible by 16384 sectors and we are asking for one bitmap after the end. Check for invalid size in the superblock. Invalid size could cause integer overflows in the rest of the code. Signed-off-by: Mikulas Patocka Cc: stable@kernel.org Signed-off-by: Linus Torvalds

Don't pass inode to ->d_hash() and ->d_compare()

2013-06-29T08:57:36+00:00

Instances either don't look at it at all (the majority of cases) or only want it to find the superblock (which can be had as dentry->d_sb). A few cases that want more are actually safe with dentry->d_inode - the only precaution needed is the check that it hadn't been replaced with NULL by rmdir() or by overwriting rename(), which case should be simply treated as cache miss. Signed-off-by: Linus Torvalds Signed-off-by: Al Viro