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>
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 703a621..efc327b 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -507,6 +507,8 @@
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",
@@ -526,6 +528,18 @@
}
/*
+ * 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
* less than 8.
@@ -533,6 +547,10 @@
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 @@
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",