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Incompatible change: h_compr is moved up so the padding is all in one chunk.
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This prevents unnecessary journal writes. More importantly it prevents
an oops due to a journal write on failed mount.
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Erases for block devices were always just emulated by writing 0xff.
Some time back the write was removed and only the page cache was
changed to 0xff. Superficialy a good idea with two problems:
1. Touching the page cache isn't necessary either.
2. However, writing out 0xff _is_ necessary for the journal. As the
journal is scanned linearly, an old non-overwritten commit entry
can be used on next mount and cause havoc.
This should fix both aspects.
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Andrew Morton sayeth:
fs/logfs/journal.c: In function 'logfs_init_journal':
fs/logfs/journal.c:266: warning: 'last_len' may be used uninitialized in this function
Can this be squished please?
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This is a new flash file system. See
Documentation/filesystems/logfs.txt
Signed-off-by: Joern Engel <joern@logfs.org>
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