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jbd2: improve comments about freeing data buffers whose page mapping is NULL

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commit 780f66e59231fcf882f36c63f287252ee47cc75a upstream.

Improve comments in jbd2_journal_commit_transaction() to describe why
we don't need to clear the buffer_mapped bit for freeing file mapping
buffers whose page mapping is NULL.

Link: https://lore.kernel.org/r/[email protected]
Fixes: c96dceeabf76 ("jbd2: do not clear the BH_Mapped flag when forgetting a metadata buffer")
Suggested-by: Jan Kara <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Signed-off-by: zhangyi (F) <[email protected]>
Signed-off-by: Theodore Ts'o <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
zhangyi (F) 2020-02-17 19:27:06 +08:00 • committed by Greg Kroah-Hartman
commit 5815a5d70d
1 changed files with 4 additions and 3 deletions
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7
fs/jbd2/commit.c
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@ -995,9 +995,10 @@ restart_loop:
* journalled data) we need to unmap buffer and clear
* more bits. We also need to be careful about the check
* because the data page mapping can get cleared under
* out hands, which alse need not to clear more bits
* because the page and buffers will be freed and can
* never be reused once we are done with them.
* our hands. Note that if mapping == NULL, we don't
* need to make buffer unmapped because the page is
* already detached from the mapping and buffers cannot
* get reused.
*/
mapping = READ_ONCE(bh->b_page->mapping);
if (mapping && !sb_is_blkdev_sb(mapping->host->i_sb)) {