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  1. 23 Dec, 2009 4 commits
    • Eric Sandeen's avatar
      fs-writeback: Add helper function to start writeback if idle · 17bd55d0
      Eric Sandeen authored 
      ext4, at least, would like to start pushing on writeback if it starts
to get close to ENOSPC when reserving worst-case blocks for delalloc
writes.  Writing out delalloc data will convert those worst-case
predictions into usually smaller actual usage, freeing up space
before we hit ENOSPC based on this speculation.

Thanks to Jens for the suggestion for the helper function,
& the naming help.

I've made the helper return status on whether writeback was
started even though I don't plan to use it in the ext4 patch;
it seems like it would be potentially useful to test this
in some cases.
Signed-off-by: default avatarEric Sandeen <sandeen@redhat.com>
Acked-by: default avatarJan Kara <jack@suse.cz>
      17bd55d0
    • Julia Lawall's avatar
      ext4: Eliminate potential double free on error path · d3533d72
      Julia Lawall authored 
      b_entry_name and buffer are initially NULL, are initialized within a loop
to the result of calling kmalloc, and are freed at the bottom of this loop.
The loop contains gotos to cleanup, which also frees b_entry_name and
buffer.  Some of these gotos are before the reinitializations of
b_entry_name and buffer.  To maintain the invariant that b_entry_name and
buffer are NULL at the top of the loop, and thus acceptable arguments to
kfree, these variables are now set to NULL after the kfrees.

This seems to be the simplest solution.  A more complicated solution
would be to introduce more labels in the error handling code at the end of
the function.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@r@
identifier E;
expression E1;
iterator I;
statement S;
@@

*kfree(E);
... when != E = E1
    when != I(E,...) S
    when != &E
*kfree(E);
// </smpl>
Signed-off-by: default avatarJulia Lawall <julia@diku.dk>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      d3533d72
    • Andrew Morton's avatar
      ext4: fix unsigned long long printk warning in super.c · a6b43e38
      Andrew Morton authored 
      sparc64 allmodconfig:

fs/ext4/super.c: In function `lifetime_write_kbytes_show':
fs/ext4/super.c:2174: warning: long long unsigned int format, long unsigned int arg (arg 4)
fs/ext4/super.c:2174: warning: long long unsigned int format, long unsigned int arg (arg 4)
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      a6b43e38
    • Theodore Ts'o's avatar
      ext4, jbd2: Add barriers for file systems with exernal journals · cc3e1bea
      Theodore Ts'o authored 
      This is a bit complicated because we are trying to optimize when we
send barriers to the fs data disk.  We could just throw in an extra
barrier to the data disk whenever we send a barrier to the journal
disk, but that's not always strictly necessary.

We only need to send a barrier during a commit when there are data
blocks which are must be written out due to an inode written in
ordered mode, or if fsync() depends on the commit to force data blocks
to disk.  Finally, before we drop transactions from the beginning of
the journal during a checkpoint operation, we need to guarantee that
any blocks that were flushed out to the data disk are firmly on the
rust platter before we drop the transaction from the journal.

Thanks to Oleg Drokin for pointing out this flaw in ext3/ext4.
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
      cc3e1bea
  3. 14 Dec, 2009 1 commit
  5. 21 Dec, 2009 2 commits
  7. 14 Dec, 2009 1 commit
  9. 24 Dec, 2009 32 commits