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Implement relatime.

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Add the "relatime" property.  When set to "on", a file's atime will only
be updated if the existing atime at least a day old or if the existing
ctime or mtime has been updated since the last access.  This behavior
is compatible with the Linux "relatime" mount option.

Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2064
Closes #1917
This commit is contained in:
Tim Chase
2014-01-18 13:00:53 -06:00
committed by Brian Behlendorf
parent 2278381ce2
commit 6d111134c0
7 changed files with 110 additions and 10 deletions
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lib/libzfs/libzfs_dataset.c
+7
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@@ -1421,6 +1421,7 @@ zfs_is_namespace_prop(zfs_prop_t prop)
switch (prop) {
case ZFS_PROP_ATIME:
case ZFS_PROP_RELATIME:
case ZFS_PROP_DEVICES:
case ZFS_PROP_EXEC:
case ZFS_PROP_SETUID:
@@ -1756,6 +1757,11 @@ get_numeric_property(zfs_handle_t *zhp, zfs_prop_t prop, zprop_source_t *src,
mntopt_off = MNTOPT_NOATIME;
break;
case ZFS_PROP_RELATIME:
mntopt_on = MNTOPT_RELATIME;
mntopt_off = MNTOPT_NORELATIME;
break;
case ZFS_PROP_DEVICES:
mntopt_on = MNTOPT_DEVICES;
mntopt_off = MNTOPT_NODEVICES;
@@ -1816,6 +1822,7 @@ get_numeric_property(zfs_handle_t *zhp, zfs_prop_t prop, zprop_source_t *src,
switch (prop) {
case ZFS_PROP_ATIME:
case ZFS_PROP_RELATIME:
case ZFS_PROP_DEVICES:
case ZFS_PROP_EXEC:
case ZFS_PROP_READONLY: