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| author | Hao Li <lihao2018.fnst@cn.fujitsu.com> | 2021-01-06 09:50:00 +0800 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2021-01-11 12:59:25 -0700 |
| commit | 85430c22e5ae87eff7b491d7a363c81325b94b8a (patch) | |
| tree | 7b3caef086ece48480095bbf8263c78aa53966c6 /Documentation/filesystems | |
| parent | c4c6b86acff7b3465e537fd6d9fce63f85584e78 (diff) | |
| download | linux-85430c22e5ae87eff7b491d7a363c81325b94b8a.tar.bz2 | |
Documentation/dax: Update description of DAX policy changing
After commit 77573fa310d9 ("fs: Kill DCACHE_DONTCACHE dentry even if
DCACHE_REFERENCED is set"), changes to DAX policy will take effect
as soon as all references to this file are gone.
Update the documentation accordingly.
Signed-off-by: Hao Li <lihao2018.fnst@cn.fujitsu.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20210106015000.5263-1-lihao2018.fnst@cn.fujitsu.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/dax.txt | 17 |
1 files changed, 3 insertions, 14 deletions
diff --git a/Documentation/filesystems/dax.txt b/Documentation/filesystems/dax.txt index 8fdb78f3c6c9..e03c20564f3a 100644 --- a/Documentation/filesystems/dax.txt +++ b/Documentation/filesystems/dax.txt @@ -83,20 +83,9 @@ Summary directories. This has runtime constraints and limitations that are described in 6) below. - 6. When changing the S_DAX policy via toggling the persistent FS_XFLAG_DAX flag, - the change in behaviour for existing regular files may not occur - immediately. If the change must take effect immediately, the administrator - needs to: - - a) stop the application so there are no active references to the data set - the policy change will affect - - b) evict the data set from kernel caches so it will be re-instantiated when - the application is restarted. This can be achieved by: - - i. drop-caches - ii. a filesystem unmount and mount cycle - iii. a system reboot + 6. When changing the S_DAX policy via toggling the persistent FS_XFLAG_DAX + flag, the change to existing regular files won't take effect until the + files are closed by all processes. Details |