lwn.git/fs/autofs4/root.c, branch v2.6.33-rt7

autofs4: always use lookup for lookup

2009-12-16T15:19:58+00:00

We need to be able to cope with the directory mutex being held during ->d_revalidate() in some cases, but not all cases, and not necessarily by us. Because we need to release the mutex when we call back to the daemon to do perform a mount we must be sure that it is us who holds the mutex so we must redirect mount requests to ->lookup() if the mutex is held. Signed-off-by: Ian Kent Cc: Sage Weil Cc: Al Viro Cc: Andreas Dilger Cc: Christoph Hellwig Cc: Yehuda Saheh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

autofs4: rename dentry to expiring in autofs4_lookup_expiring()

2009-12-16T15:19:58+00:00

In autofs4_lookup_expiring() a declaration within the list traversal loop uses a declaration that has the same name as the function parameter. Signed-off-by: Ian Kent Cc: Sage Weil Cc: Al Viro Cc: Andreas Dilger Cc: Christoph Hellwig Cc: Yehuda Saheh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

autofs4: rename dentry to active in autofs4_lookup_active()

2009-12-16T15:19:58+00:00

In autofs4_lookup_active() a declaration within the list traversal loop uses a declaration that has the same name as the function parameter. Signed-off-by: Ian Kent Cc: Sage Weil Cc: Al Viro Cc: Andreas Dilger Cc: Christoph Hellwig Cc: Yehuda Saheh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

autofs4: eliminate d_unhashed in path walk checks

2009-12-16T15:19:58+00:00

We unhash the dentry (in a subsequent patch) in ->d_revalidate() in order to send mount requests to ->lookup(). But then we can not rely on d_unhased() to give reliable results because it may be called at any time by any code path. The d_unhashed() function is used by __simple_empty() in the path walking callbacks but autofs mount point dentrys should have no directories at all so a list_empty() on d_subdirs should be (and is) sufficient. Signed-off-by: Ian Kent Cc: Sage Weil Cc: Al Viro Cc: Andreas Dilger Cc: Christoph Hellwig Cc: Yehuda Saheh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

autofs4: cleanup active and expire lookup

2009-12-16T15:19:58+00:00

The lookup functions for active and expiring dentrys use parameters that can be easily obtained on entry so we change the call to to take just the dentry. This makes the subsequent change, to send all lookups to ->lookup(), a bit cleaner. Signed-off-by: Ian Kent Cc: Sage Weil Cc: Al Viro Cc: Andreas Dilger Cc: Christoph Hellwig Cc: Yehuda Saheh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

autofs4: renamer unhashed to active in autofs4_lookup()

2009-12-16T15:19:58+00:00

Rename the variable unhashed to active in autofs4_lookup() to better reflect its usage. Signed-off-by: Ian Kent Cc: Sage Weil Cc: Al Viro Cc: Andreas Dilger Cc: Christoph Hellwig Cc: Yehuda Saheh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

autofs4: use autofs_info for pending flag

2009-12-16T15:19:58+00:00

Eliminate the use of the d_lock spin lock by using the autofs super block info spin lock. This reduces the number of spin locks we use by one and makes the code for the following patch (to redirect ->d_revalidate() to ->lookup()) a little simpler. Signed-off-by: Ian Kent Cc: Sage Weil Cc: Al Viro Cc: Andreas Dilger Cc: Christoph Hellwig Cc: Yehuda Saheh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

autofs4: use helper function for need mount check

2009-12-16T15:19:57+00:00

Define simple helper function for checking if we need to trigger a mount. Signed-off-by: Ian Kent Cc: Sage Weil Cc: Al Viro Cc: Andreas Dilger Cc: Christoph Hellwig Cc: Yehuda Saheh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

autofs4: use helper functions for expiring list

2009-12-16T15:19:57+00:00

Define some simple helper functions for adding and deleting entries on the expiring dentry list. Signed-off-by: Ian Kent Cc: Sage Weil Cc: Al Viro Cc: Andreas Dilger Cc: Christoph Hellwig Cc: Yehuda Saheh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

autofs4: use helper functions for active list handling

2009-12-16T15:19:57+00:00

Define some simple helper functions for adding and deleting entries on the active (and unhashed) dentry list. Signed-off-by: Ian Kent Cc: Sage Weil Cc: Al Viro Cc: Andreas Dilger Cc: Christoph Hellwig Cc: Yehuda Saheh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds