Name
__bread_gfp —
reads a specified block and returns the bh
Synopsis
struct buffer_head * __bread_gfp ( | struct block_device * bdev, |
| | sector_t block, |
| | unsigned size, |
| | gfp_t gfp); |
Arguments
bdev
the block_device to read from
block
number of block
size
size (in bytes) to read
gfp
page allocation flag
Description
Reads a specified block, and returns buffer head that contains it.
The page cache can be allocated from non-movable area
not to prevent page migration if you set gfp to zero.
It returns NULL if the block was unreadable.