Commit 8efd6894 authored by Deepa Dinamani's avatar Deepa Dinamani
Browse files

fs: add timespec64_truncate() 



As vfs moves to using struct timespec64 to represent times,
update the argument to timespec_truncate() to use
struct timespec64. Also change the name of the function.
The rest of the implementation logic is the same.

Move this to fs/inode.c instead of kernel/time/time.c as all the
users of this api are filesystems.

Signed-off-by: default avatarDeepa Dinamani <deepa.kernel@gmail.com>
Cc: <viro@zeniv.linux.org.uk>
parent 771c577c

fs/inode.c

+24 −0
Original line number Diff line number Diff line
@@ -2110,6 +2110,30 @@ void inode_nohighmem(struct inode *inode) 
}

EXPORT_SYMBOL(inode_nohighmem);



/**

 * timespec64_trunc - Truncate timespec64 to a granularity

 * @t: Timespec64

 * @gran: Granularity in ns.

 *

 * Truncate a timespec64 to a granularity. Always rounds down. gran must

 * not be 0 nor greater than a second (NSEC_PER_SEC, or 10^9 ns).

 */

struct timespec64 timespec64_trunc(struct timespec64 t, unsigned gran)

{

	/* Avoid division in the common cases 1 ns and 1 s. */

	if (gran == 1) {

		/* nothing */

	} else if (gran == NSEC_PER_SEC) {

		t.tv_nsec = 0;

	} else if (gran > 1 && gran < NSEC_PER_SEC) {

		t.tv_nsec -= t.tv_nsec % gran;

	} else {

		WARN(1, "illegal file time granularity: %u", gran);

	}

	return t;

}

EXPORT_SYMBOL(timespec64_trunc);



/**

 * current_time - Return FS time

 * @inode: inode.

include/linux/fs.h

+1 −0
Original line number Diff line number Diff line
@@ -1476,6 +1476,7 @@ static inline void i_gid_write(struct inode *inode, gid_t gid) 
	inode->i_gid = make_kgid(inode->i_sb->s_user_ns, gid);

}



extern struct timespec64 timespec64_trunc(struct timespec64 t, unsigned gran);

extern struct timespec current_time(struct inode *inode);



/*

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