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UBIFS: incorporate maximum write size
Incorporate maximum write size into the UBIFS description data structure. This patch just introduces new 'c->max_write_size' and 'c->max_write_shift' fields as a preparation for the following patches. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
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@ -507,6 +507,8 @@ static int init_constants_early(struct ubifs_info *c)
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c->half_leb_size = c->leb_size / 2;
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c->min_io_size = c->di.min_io_size;
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c->min_io_shift = fls(c->min_io_size) - 1;
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c->max_write_size = c->di.max_write_size;
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c->max_write_shift = fls(c->max_write_size) - 1;
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if (c->leb_size < UBIFS_MIN_LEB_SZ) {
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ubifs_err("too small LEBs (%d bytes), min. is %d bytes",
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@ -525,6 +527,18 @@ static int init_constants_early(struct ubifs_info *c)
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return -EINVAL;
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}
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/*
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* Maximum write size has to be greater or equivalent to min. I/O
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* size, and be multiple of min. I/O size.
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*/
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if (c->max_write_size < c->min_io_size ||
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c->max_write_size % c->min_io_size ||
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!is_power_of_2(c->max_write_size)) {
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ubifs_err("bad write buffer size %d for %d min. I/O unit",
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c->max_write_size, c->min_io_size);
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return -EINVAL;
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}
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/*
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* UBIFS aligns all node to 8-byte boundary, so to make function in
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* io.c simpler, assume minimum I/O unit size to be 8 bytes if it is
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@ -533,6 +547,10 @@ static int init_constants_early(struct ubifs_info *c)
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if (c->min_io_size < 8) {
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c->min_io_size = 8;
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c->min_io_shift = 3;
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if (c->max_write_size < c->min_io_size) {
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c->max_write_size = c->min_io_size;
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c->max_write_shift = c->min_io_shift;
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}
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}
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c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size);
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@ -1391,6 +1409,7 @@ static int mount_ubifs(struct ubifs_info *c)
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dbg_msg("compiled on: " __DATE__ " at " __TIME__);
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dbg_msg("min. I/O unit size: %d bytes", c->min_io_size);
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dbg_msg("max. write size: %d bytes", c->max_write_size);
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dbg_msg("LEB size: %d bytes (%d KiB)",
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c->leb_size, c->leb_size >> 10);
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dbg_msg("data journal heads: %d",
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@ -1024,6 +1024,9 @@ struct ubifs_debug_info;
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*
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* @min_io_size: minimal input/output unit size
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* @min_io_shift: number of bits in @min_io_size minus one
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* @max_write_size: maximum amount of bytes the underlying flash can write at a
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* time (MTD write buffer size)
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* @max_write_shift: number of bits in @max_write_size minus one
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* @leb_size: logical eraseblock size in bytes
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* @half_leb_size: half LEB size
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* @idx_leb_size: how many bytes of an LEB are effectively available when it is
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@ -1270,6 +1273,8 @@ struct ubifs_info {
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int min_io_size;
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int min_io_shift;
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int max_write_size;
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int max_write_shift;
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int leb_size;
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int half_leb_size;
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int idx_leb_size;
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