f2fs: support IO alignment for DATA and NODE writes

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This patch implements IO alignment by filling dummy blocks in DATA and NODE
write bios. If we can guarantee, for example, 32KB or 64KB for such the IOs,
we can eliminate underlying dummy page problem which FTL conducts in order to
close MLC or TLC partial written pages.

Note that,
 - it requires "-o mode=lfs".
 - IO size should be power of 2, not exceed BIO_MAX_PAGES, 256.
 - read IO is still 4KB.
 - do checkpoint at fsync, if dummy NODE page was written.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

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This commit is contained in:

Jaegeuk Kim 2016-12-14 10:12:56 -08:00

parent 554b5125f5

commit 0a595ebaaa

6 changed files with 84 additions and 6 deletions

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55

fs/f2fs/data.c

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4

fs/f2fs/f2fs.h

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9

fs/f2fs/segment.c

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3

fs/f2fs/segment.h

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13

fs/f2fs/super.c

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