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NetBSD 6.1.5 - man page for puffs_path (netbsd section 3)

PUFFS_PATH(3)			   BSD Library Functions Manual 		    PUFFS_PATH(3)

     puffs_path -- puffs pathbuilding routines

     library ``libpuffs''

     #include <puffs.h>

     pu_pathbuild_fn(struct puffs_usermount *pu, const struct puffs_pathobj *po_dir,
	 const struct puffs_pathobj *po_comp, size_t offset, struct puffs_pathobj *po_new);

     pu_pathtransform_fn(struct puffs_usermount *pu, const struct puffs_pathobj *po_base,
	 const struct puffs_cn *pcn, struct puffs_pathobj *po_new);

     pu_pathcmp_fn(struct puffs_usermount *pu, struct puffs_pathobj *po1,
	 struct puffs_pathobj *po2, size_t checklen, int checkprefix);

     pu_pathfree_fn(struct puffs_usermount *pu, struct puffs_pathobj *po);

     pu_namemod_fn(struct puffs_usermount *pu, struct puffs_pathobj *po_dir,
	 struct puffs_cn *pcn);

     struct puffs_pathobj *
     puffs_getrootpathobj(struct puffs_usermount *pu);

     The puffs library has the ability to provide full pathnames for backends which require them.
     Normal file systems should be constructed without the file system node tied to a file name
     and should not used routines described herein.  An example of a file system where the back-
     end requires filenames is mount_psshfs(8).

     The features described here are enabled by passing PUFFS_FLAG_BUILDPATH to puffs_init().
     This facility requires to use puffs nodes to store the contents of the pathname.  Either the
     address of the operation cookie must directly be that of the puffs node, or puffs_set_cmap()
     must be used to set a mapping function from the cookie to the puffs node associated with the
     cookie.  Finally, the root node for the file system must be set using puffs_setroot() and
     the root path object retrieved using puffs_getrootpathobj() and initialized.

     There are two different places a filename can be retrieved from.  It is available for each
     puffs node after the node has been registered with the framework, i.e.  after the routine
     creating the node returns.  In other words, there is a window between the node is created
     and when the pathname is available and multithreaded file systems must take this into
     account.  The second place where a pathname is available is from the componentname struct
     puffs_pcn in operations which are passed one.  These can be retrieved using the convenience
     macros PNPATH() and PCNPATH() for node and componentname, respectively.  The type of object
     they return is void *.

     By default the framework manages "regular" filenames, which consist of directory names sepa-
     rated by "/" and a final component.  If the file system wishes to use pathnames of this for-
     mat, all it has to do it enable the feature.  Everything else, including bookkeeping for
     node and directory renames, is done by the library.  The callback routines described next
     provide the ability to build non-standard pathnames.  A pu_foo_fn() callback is set using
     the puffs_set_foo() routine.

     This manual page is still unfinished.  Please take a number and wait in line.

     puffs(3), puffs_node(3), mount_psshfs(8), mount_sysctlfs(8)

BSD					December 27, 2007				      BSD

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