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| author | Fox Chen <foxhlchen@gmail.com> | 2021-05-27 12:16:08 +0300 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2021-06-18 20:36:07 +0300 |
| commit | 8593d2cc8c2f09164d674b2318661ede00dd4d0e (patch) | |
| tree | 0ad02f8491971c78677700bccb5d53c1f067cd98 /Documentation/filesystems/path-lookup.rst | |
| parent | 084c86837a3583c7cf56d74f91fb8e6191f99a8a (diff) | |
| download | linux-8593d2cc8c2f09164d674b2318661ede00dd4d0e.tar.xz | |
docs: path-lookup: update path_mountpoint() part
path_mountpoint() doesn't exist anymore. Have been folded
into path_lookup_at when flag is set with LOOKUP_MOUNTPOINT.
Check commit: commit 161aff1d93abf0e ("LOOKUP_MOUNTPOINT: fold
path_mountpointat() into path_lookupat()")
Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20210527091618.287093-4-foxhlchen@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation/filesystems/path-lookup.rst')
| -rw-r--r-- | Documentation/filesystems/path-lookup.rst | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/Documentation/filesystems/path-lookup.rst b/Documentation/filesystems/path-lookup.rst index 6ea0880fb982..652d3284f178 100644 --- a/Documentation/filesystems/path-lookup.rst +++ b/Documentation/filesystems/path-lookup.rst @@ -472,7 +472,7 @@ Handling the final component ``nd->last_type`` to refer to the final component of the path. It does not call ``walk_component()`` that last time. Handling that final component remains for the caller to sort out. Those callers are -``path_lookupat()``, ``path_parentat()``, ``path_mountpoint()`` and +``path_lookupat()``, ``path_parentat()`` and ``path_openat()`` each of which handles the differing requirements of different system calls. @@ -488,12 +488,10 @@ perform their operation. object is wanted such as by ``stat()`` or ``chmod()``. It essentially just calls ``walk_component()`` on the final component through a call to ``lookup_last()``. ``path_lookupat()`` returns just the final dentry. - -``path_mountpoint()`` handles the special case of unmounting which must -not try to revalidate the mounted filesystem. It effectively -contains, through a call to ``mountpoint_last()``, an alternate -implementation of ``lookup_slow()`` which skips that step. This is -important when unmounting a filesystem that is inaccessible, such as +It is worth noting that when flag ``LOOKUP_MOUNTPOINT`` is set, +``path_lookupat()`` will unset LOOKUP_JUMPED in nameidata so that in the +subsequent path traversal ``d_weak_revalidate()`` won't be called. +This is important when unmounting a filesystem that is inaccessible, such as one provided by a dead NFS server. Finally ``path_openat()`` is used for the ``open()`` system call; it |