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f2fs: avoid writing 0'th page in volatile writes

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The first page of volatile writes usually contains a sort of header information
which will be used for recovery.
(e.g., journal header of sqlite)

If this is written without other journal data, user needs to handle the stale
journal information.

Acked-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2016-04-14 16:48:52 -07:00
parent eca76e783c
commit e6e5f5610d
1 changed files with 4 additions and 2 deletions
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6
fs/f2fs/data.c
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@ -1177,8 +1177,10 @@ write:
goto redirty_out;
if (f2fs_is_drop_cache(inode))
goto out;
if (f2fs_is_volatile_file(inode) && !wbc->for_reclaim &&
available_free_memory(sbi, BASE_CHECK))
/* we should not write 0'th page having journal header */
if (f2fs_is_volatile_file(inode) && (!page->index ||
(!wbc->for_reclaim &&
available_free_memory(sbi, BASE_CHECK))))
goto redirty_out;
/* Dentry blocks are controlled by checkpoint */