tree a388a21fac6ab04e75fb7a722a6abd095ab997a1
parent 75312619e8cd47265da210189cca57ab09640b18
author Chris Mason <chris.mason@oracle.com> 1218786043 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1218814544 -0700

fs/inode.c: properly init address_space->writeback_index

write_cache_pages() uses i_mapping->writeback_index to pick up where it
left off the last time a given inode was found by pdflush or
balance_dirty_pages (or anyone else who sets wbc->range_cyclic)

alloc_inode() should set it to a sane value so that writeback doesn't
start in the middle of a file.  It is somewhat difficult to notice the bug
since write_cache_pages will loop around to the start of the file and the
elevator helps hide the resulting seeks.

For whatever reason, Btrfs hits this often.  Unpatched, untarring 30
copies of the linux kernel in series runs at 47MB/s on a single sata
drive.  With this fix, it jumps to 62MB/s.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>