linux.git/fs/ext4/dir.c, branch v2.6.30

ext4: New rec_len encoding for very large blocksizes

2009-02-15T04:01:36+00:00

The rec_len field in the directory entry is 16 bits, so to encode
blocksizes larger than 64k becomes problematic.  This patch allows us
to supprot block sizes up to 256k, by using the low 2 bits to extend
the range of rec_len to 2**18-1 (since valid rec_len sizes must be a
multiple of 4).  We use the convention that a rec_len of 0 or 65535
means the filesystem block size, for compatibility with older kernels.

It's unlikely we'll see VM pages of up to 256k, but at some point we
might find that the Linux VM has been enhanced to support filesystem
block sizes > than the VM page size, at which point it might be useful
for some applications to allow very large filesystem block sizes.

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

ext4: Make printk's consistently prefixed with "EXT4-fs: "

2009-01-06T05:20:32+00:00

Previously, some were "ext4: ", and some were "EXT4: "; change them to
be consistent with most ext4 printk's, which is to use "EXT4-fs: ".

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

ext4: Change unsigned long to unsigned int

2008-11-05T05:14:04+00:00

Convert the unsigned longs that are most responsible for bloating the
stack usage on 64-bit systems.

Nearly all places in the ext3/4 code which uses "unsigned long" is
probably a bug, since on 32-bit systems a ulong a 32-bits, which means
we are wasting stack space on 64-bit systems.

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

ext4: Fix duplicate entries returned from getdents() system call

2008-10-26T02:37:55+00:00

Fix a regression caused by commit d0156417, "ext4: fix ext4_dx_readdir
hash collision handling", where deleting files in a large directory
(requiring more than one getdents system call), results in some
filenames being returned twice.  This was caused by a failure to
update info->curr_hash and info->curr_minor_hash, so that if the
directory had gotten modified since the last getdents() system call
(as would be the case if the user is running "rm -r" or "git clean"),
a directory entry would get returned twice to the userspace.

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

This patch fixes the bug reported by Markus Trippelsdorf at:
http://bugzilla.kernel.org/show_bug.cgi?id=11844

Signed-off-by: "Theodore Ts'o" 
Tested-by: Markus Trippelsdorf

ext4: Avoid printk floods in the face of directory corruption

2008-10-09T15:15:52+00:00

Note: some people thinks this represents a security bug, since it
might make the system go away while it is printing a large number of
console messages, especially if a serial console is involved.  Hence,
it has been assigned CVE-2008-3528, but it requires that the attacker
either has physical access to your machine to insert a USB disk with a
corrupted filesystem image (at which point why not just hit the power
button), or is otherwise able to convince the system administrator to
mount an arbitrary filesystem image (at which point why not just
include a setuid shell or world-writable hard disk device file or some
such).  Me, I think they're just being silly. --tytso

Signed-off-by: Eric Sandeen 
Signed-off-by: "Theodore Ts'o" 
Cc: linux-ext4@vger.kernel.org
Cc: Eugene Teo

ext4: Fix whitespace checkpatch warnings/errors

2008-09-09T02:25:24+00:00

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

ext4: Add printk priority levels to clean up checkpatch warnings

2008-09-09T03:00:52+00:00

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

ext4: Fix ext4_dx_readdir hash collision handling

2008-08-20T01:57:43+00:00

This fixes a bug where readdir() would return a directory entry twice
if there was a hash collision in an hash tree indexed directory.

Signed-off-by: Eugene Dashevsky 
Signed-off-by: Mike Snitzer 
Signed-off-by: "Theodore Ts'o"

ext4: delayed allocation ENOSPC handling

2008-07-14T21:52:37+00:00

This patch does block reservation for delayed
allocation, to avoid ENOSPC later at page flush time.

Blocks(data and metadata) are reserved at da_write_begin()
time, the freeblocks counter is updated by then, and the number of
reserved blocks is store in per inode counter.
        
At the writepage time, the unused reserved meta blocks are returned
back. At unlink/truncate time, reserved blocks are properly released.

Updated fix from  Aneesh Kumar K.V 
to fix the oldallocator block reservation accounting with delalloc, added
lock to guard the counters and also fix the reservation for meta blocks.

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

ext4: improve some code in rb tree part of dir.c

2008-07-11T23:27:31+00:00

* remove unnecessary code in free_rb_tree_fname

* rename free_rb_tree_fname to ext4_htree_create_dir_info
  since it and ext4_htree_free_dir_info are a pair

* replace kmalloc with kzalloc in ext4_htree_free_dir_info

All these make the code more readable and simple.
PS: this patch is also suitable for ext3.

Signed-off-by: Shen Feng 
Signed-off-by: Mingming Cao 
Signed-off-by: "Theodore Ts'o"