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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>
This commit is contained in:
Artem Bityutskiy 2011-01-30 18:58:32 +02:00
parent f43ec882b8
commit 3e8e2e0c8d
2 changed files with 24 additions and 0 deletions
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19
fs/ubifs/super.c
View File

@ -507,6 +507,8 @@ static int init_constants_early(struct ubifs_info *c)
c->half_leb_size = c->leb_size / 2;
c->min_io_size = c->di.min_io_size;
c->min_io_shift = fls(c->min_io_size) - 1;
c->max_write_size = c->di.max_write_size;
c->max_write_shift = fls(c->max_write_size) - 1;
if (c->leb_size < UBIFS_MIN_LEB_SZ) {
ubifs_err("too small LEBs (%d bytes), min. is %d bytes",
@ -525,6 +527,18 @@ static int init_constants_early(struct ubifs_info *c)
return -EINVAL;
}
/*
* Maximum write size has to be greater or equivalent to min. I/O
* size, and be multiple of min. I/O size.
*/
if (c->max_write_size < c->min_io_size ||
c->max_write_size % c->min_io_size ||
!is_power_of_2(c->max_write_size)) {
ubifs_err("bad write buffer size %d for %d min. I/O unit",
c->max_write_size, c->min_io_size);
return -EINVAL;
}
/*
* UBIFS aligns all node to 8-byte boundary, so to make function in
* io.c simpler, assume minimum I/O unit size to be 8 bytes if it is
@ -533,6 +547,10 @@ static int init_constants_early(struct ubifs_info *c)
if (c->min_io_size < 8) {
c->min_io_size = 8;
c->min_io_shift = 3;
if (c->max_write_size < c->min_io_size) {
c->max_write_size = c->min_io_size;
c->max_write_shift = c->min_io_shift;
}
}
c->ref_node_alsz = ALIGN(UBIFS_REF_NODE_SZ, c->min_io_size);
@ -1391,6 +1409,7 @@ static int mount_ubifs(struct ubifs_info *c)
dbg_msg("compiled on: " __DATE__ " at " __TIME__);
dbg_msg("min. I/O unit size: %d bytes", c->min_io_size);
dbg_msg("max. write size: %d bytes", c->max_write_size);
dbg_msg("LEB size: %d bytes (%d KiB)",
c->leb_size, c->leb_size >> 10);
dbg_msg("data journal heads: %d",

5
fs/ubifs/ubifs.h
View File

@ -1024,6 +1024,9 @@ struct ubifs_debug_info;
*
* @min_io_size: minimal input/output unit size
* @min_io_shift: number of bits in @min_io_size minus one
* @max_write_size: maximum amount of bytes the underlying flash can write at a
* time (MTD write buffer size)
* @max_write_shift: number of bits in @max_write_size minus one
* @leb_size: logical eraseblock size in bytes
* @half_leb_size: half LEB size
* @idx_leb_size: how many bytes of an LEB are effectively available when it is
@ -1270,6 +1273,8 @@ struct ubifs_info {
int min_io_size;
int min_io_shift;
int max_write_size;
int max_write_shift;
int leb_size;
int half_leb_size;
int idx_leb_size;