Frank Sorenson d9f4d94261 fat: create a function to calculate the timezone offest
Patch series "fat: timestamp updates", v5.

fat/msdos timestamps are stored on-disk with several different
granularities, some of them lower resolution than timespec64_trunc() can
provide.  In addition, they are only truncated as they are written to
disk, so the timestamps in-memory for new or modified files/directories
may be different from the same timestamps after a remount, as the
now-truncated times are re-read from the on-disk format.

These patches allow finer granularity for the timestamps where possible
and add fat-specific ->update_time inode operation and fat_truncate_time
functions to truncate each timestamp correctly, giving consistent times
across remounts.

This patch (of 4):

Move the calculation of the number of seconds in the timezone offset to a
common function.

Link: http://lkml.kernel.org/r/3671ff8cff5eeedbb85ebda5e4de0728920db4f6.1538363961.git.sorenson@redhat.com
Signed-off-by: Frank Sorenson <[email protected]>
Acked-by: OGAWA Hirofumi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
2018-10-31 08:54:14 -07:00
2018-10-31 08:54:12 -07:00
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2018-10-31 08:54:12 -07:00
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