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| author | Yongqiang Yang <xiaoqiangnk@gmail.com> | 2011-12-28 23:46:46 +0100 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2011-12-28 23:46:46 +0100 |
| commit | 1ba37268cd19e5a2a80924bfe8618bf1ba3e8249 (patch) | |
| tree | f4227aaf3963e6c948b01e57c98697e6ab2157d6 /Documentation/md.txt | |
| parent | ext4: flush journal when switching from data=journal mode (diff) | |
| download | linux-1ba37268cd19e5a2a80924bfe8618bf1ba3e8249.tar.xz linux-1ba37268cd19e5a2a80924bfe8618bf1ba3e8249.zip | |
jbd2: clear revoked flag on buffers before a new transaction started
Currently, we clear revoked flag only when a block is reused. However,
this can tigger a false journal error. Consider a situation when a block
is used as a meta block and is deleted(revoked) in ordered mode, then the
block is allocated as a data block to a file. At this moment, user changes
the file's journal mode from ordered to journaled and truncates the file.
The block will be considered re-revoked by journal because it has revoked
flag still pending from the last transaction and an assertion triggers.
We fix the problem by keeping the revoked status more uptodate - we clear
revoked flag when switching revoke tables to reflect there is no revoked
buffers in current transaction any more.
Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'Documentation/md.txt')
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