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fs: add timespec64_truncate()

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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: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: <viro@zeniv.linux.org.uk>
This commit is contained in:
Deepa Dinamani 2018-04-22 20:18:46 -07:00
parent 771c577c23
commit 8efd6894ff
2 changed files with 25 additions and 0 deletions
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24
fs/inode.c
View File

@ -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.

1
include/linux/fs.h
View File

@ -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);
/*