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| author | Deepa Dinamani <deepa.kernel@gmail.com> | 2018-04-22 20:18:46 -0700 |
|---|---|---|
| committer | Deepa Dinamani <deepa.kernel@gmail.com> | 2018-05-25 15:31:09 -0700 |
| commit | 8efd6894ff089adeeac7cb9f32125b85d963d1bc (patch) | |
| tree | ba9af4e1fa02f46279683236e1a5c9407d12d6d0 /fs/inode.c | |
| parent | 771c577c23bac90597c685971d7297ea00f99d11 (diff) | |
| download | lwn-8efd6894ff089adeeac7cb9f32125b85d963d1bc.tar.gz lwn-8efd6894ff089adeeac7cb9f32125b85d963d1bc.zip | |
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: Deepa Dinamani <deepa.kernel@gmail.com>
Cc: <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/inode.c')
| -rw-r--r-- | fs/inode.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/fs/inode.c b/fs/inode.c index 13ceb98c3bd3..93af998ee290 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -2111,6 +2111,30 @@ 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. * |