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| author |   Chris Mason <mason@suse.com> | 2006-02-01 03:06:47 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-01 08:53:26 -0800 |
| commit | d62b1b87a7d1c3a21dddabed4251763090be3182 (patch) | |
| tree | 52d563a2af8bde77c9e4638e3636c8cd3bb0c01e /fs/buffer.c | |
| parent | [PATCH] reiserfs: use generic_permission (diff) | |
| download | linux-dev-d62b1b87a7d1c3a21dddabed4251763090be3182.tar.xz linux-dev-d62b1b87a7d1c3a21dddabed4251763090be3182.zip | |
[PATCH] resierfs: fix reiserfs_invalidatepage race against data=ordered
After a transaction has closed but before it has finished commit, there is
a window where data=ordered mode requires invalidatepage to pin pages
instead of freeing them. This patch fixes a race between the
invalidatepage checks and data=ordered writeback, and it also adds a check
to the reiserfs write_ordered_buffers routines to write any anonymous
buffers that were dirtied after its first writeback loop.
That bug works like this:
proc1: transaction closes and a new one starts
proc1: write_ordered_buffers starts processing data=ordered list
proc1: buffer A is cleaned and written
proc2: buffer A is dirtied by another process
proc2: File is truncated to zero, page A goes through invalidatepage
proc2: reiserfs_invalidatepage sees dirty buffer A with reiserfs
journal head, pins it
proc1: write_ordered_buffers frees the journal head on buffer A
At this point, buffer A stays dirty forever
Signed-off-by: Chris Mason <mason@suse.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/buffer.c')
0 files changed, 0 insertions, 0 deletions