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| author | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2011-01-29 18:27:13 +0200 |
|---|---|---|
| committer | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2011-01-29 18:27:13 +0200 |
| commit | 3a0592b1dd69cfc403ee7514c47b9d57d8bbd6d7 (patch) | |
| tree | b98f0e7cc2dc25cdffcd52dee0f070ab033b5f05 | |
| parent | 1bae4ce27c9c90344f23c65ea6966c50ffeae2f5 (diff) | |
| download | linux-3a0592b1dd69cfc403ee7514c47b9d57d8bbd6d7.tar.bz2 | |
Revert "UBI: use mtd->writebufsize to set minimal I/O unit size"
This reverts commit a121f643993474548fe98144514c50dd4f3dbe76.
Unfortunately, this commit breaks UBIFS backward compatibility and
makes new UBIFS refuse older UBIFS-formatted media:
UBIFS error: validate_sb: min. I/O unit mismatch: 8 in superblock, 64 real
Thus, we have to revert this patch and work on a better solution.
Reported-by: Holger Brunck <holger.brunck@keymile.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
| -rw-r--r-- | drivers/mtd/ubi/build.c | 28 |
1 files changed, 1 insertions, 27 deletions
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c index f49e49dc5928..5ebe280225d6 100644 --- a/drivers/mtd/ubi/build.c +++ b/drivers/mtd/ubi/build.c @@ -672,33 +672,7 @@ static int io_init(struct ubi_device *ubi) ubi->nor_flash = 1; } - /* - * Set UBI min. I/O size (@ubi->min_io_size). We use @mtd->writebufsize - * for these purposes, not @mtd->writesize. At the moment this does not - * matter for NAND, because currently @mtd->writebufsize is equivalent to - * @mtd->writesize for all NANDs. However, some CFI NOR flashes may - * have @mtd->writebufsize which is multiple of @mtd->writesize. - * - * The reason we use @mtd->writebufsize for @ubi->min_io_size is that - * UBI and UBIFS recovery algorithms rely on the fact that if there was - * an unclean power cut, then we can find offset of the last corrupted - * node, align the offset to @ubi->min_io_size, read the rest of the - * eraseblock starting from this offset, and check whether there are - * only 0xFF bytes. If yes, then we are probably dealing with a - * corruption caused by a power cut, if not, then this is probably some - * severe corruption. - * - * Thus, we have to use the maximum write unit size of the flash, which - * is @mtd->writebufsize, because @mtd->writesize is the minimum write - * size, not the maximum. - */ - if (ubi->mtd->type == MTD_NANDFLASH) - ubi_assert(ubi->mtd->writebufsize == ubi->mtd->writesize); - else if (ubi->mtd->type == MTD_NORFLASH) - ubi_assert(ubi->mtd->writebufsize % ubi->mtd->writesize == 0); - - ubi->min_io_size = ubi->mtd->writebufsize; - + ubi->min_io_size = ubi->mtd->writesize; ubi->hdrs_min_io_size = ubi->mtd->writesize >> ubi->mtd->subpage_sft; /* |