__bread_gfp(9) 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.

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