new helper: mount_subtree()

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takes vfsmount and relative path, does lookup within that vfsmount
(possibly triggering automounts) and returns the result as root
of subtree suitable for return by ->mount() (i.e. a reference to
dentry and an active reference to its superblock grabbed, superblock
locked exclusive).

btrfs and nfs switched to it instead of open-coding the sucker.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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This commit is contained in:

Al Viro 2011-11-16 21:43:59 -05:00

parent c133449587

commit ea441d1104

4 changed files with 41 additions and 53 deletions

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include/linux/fs.h

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