The Linux Kernel/buffer uptodate

< The Linux Kernel

buffer_uptodate

SYNOPSIS 

#include <linux/buffer_head.h>

// BUFFER_FNS(Uptodate, uptodate)
static inline int buffer_uptodate(const struct buffer_head *bh);

SHORT DESCRIPTION

Returns the up-to-date flag for the given buffer head.

FULL DESCRIPTION

It's implemented as a simple macro, which just isolates a single bit from a field in the buffer_head. It has no side effects of any kind.

RETURN

true, if the buffer is up to date, i.e. the data on the physical storage could be used, to read the data back in to memory.

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