puffs_flush(3) [netbsd man page]

PUFFS_FLUSH(3)						   BSD Library Functions Manual 					    PUFFS_FLUSH(3)

NAME

     puffs_flush -- puffs kernel cache flushing and invalidation routines

LIBRARY

     puffs Convenience Library (libpuffs, -lpuffs)

SYNOPSIS

     #include <puffs.h>

     int
     puffs_inval_namecache_dir(struct puffs_usermount *pu, puffs_cookie_t cookie);

     int
     puffs_inval_namecache_all(struct puffs_usermount *pu);

     int
     puffs_inval_pagecache_node(struct puffs_usermount *pu, puffs_cookie_t cookie);

     int
     puffs_inval_pagecache_node_range(struct puffs_usermount *pu, puffs_cookie_t cookie, off_t start, off_t end);

     int
     puffs_flush_pagecache_node(struct puffs_usermount *pu, puffs_cookie_t cookie);

     int
     puffs_flush_pagecache_node_range(struct puffs_usermount *pu, puffs_cookie_t cookie, off_t start, off_t end);

DESCRIPTION

     These routines are used inform the kernel that any information it might have cached is no longer valid.  puffs_inval_namecache_dir() invali-
     dates the name cache for a given directory.  The argument cookie should describe an existing and valid directory cookie for the file system.
     Similarly, puffs_inval_namecache_all() invalidates the name cache for the entire file system (this routine might go away).

     The cached pages (file contents) for a regular file described by cookie are invalidated using puffs_inval_pagecache_node().  A specific range
     can be invalidated using puffs_inval_pagecache_node_range() for a platform specific page level granularity.  The offset start will be
     truncated to a page boundary while end will be rounded up to the next page boundary.  As a special case, specifying 0 as end will invalidate
     all contents from start to the end of the file.

     It is especially important to note that these routines will not only invalidate data in the "read cache", but also data in the "write back"
     cache (conceptually speaking; in reality they are the same cache), which has not yet been flushed to the file server.  Therefore any
     unflushed data will be lost.

     The counterparts of the invalidation routines are the flushing routines puffs_flush_pagecache_node() and puffs_flush_pagecache_node_range(),
     which force unwritten data from the kernel page cache to be written.  For the flush range version, the same range rules as with the invalida-
     tion routine apply.  The data is flushed asynchronously, i.e. if the routine returns successfully, all the caller knows is that the data has
     been queued for writing.

SEE ALSO

     puffs(3)

BSD
								   April 7, 2007							       BSD

Check Out this Related Man Page

PUFFS_NODE(3)						   BSD Library Functions Manual 					     PUFFS_NODE(3)

NAME

     puffs_node -- puffs node routines

LIBRARY

     puffs Convenience Library (libpuffs, -lpuffs)

SYNOPSIS

     #include <puffs.h>

     struct puffs_node *
     puffs_pn_new(struct puffs_usermount *pu, void *priv);

     void *
     puffs_nodewalk_fn(struct puffs_usermount *pu, struct puffs_node *pn, void *arg);

     void *
     puffs_pn_nodewalk(struct puffs_usermount *pu, puffs_nodewalk_fn nwfn, void *arg);

     void
     puffs_pn_remove(struct puffs_node *pn);

     void
     puffs_pn_put(struct puffs_node *pn);

DESCRIPTION

     puffs_pn_new(pu, priv)
	   Create a new node and attach it to the mountpoint pu.  The argument priv can be used for associating file system specific data with the
	   new node and will not be accessed by puffs.

     puffs_nodewalk_fn(pu, pn, arg)
	   A callback for puffs_nodewalk().  The list of nodes is iterated in the argument pn and the argument arg is the argument given to
	   puffs_nodewalk().

     puffs_nodewalk(pu, nwfn, arg)
	   Walk all nodes associted with the mountpoint pu and call nwfn() for them.  The walk is aborted if puffs_nodewalk_fn() returns a value
	   which is not NULL.  This value is also returned this function.  In case the whole set of nodes is traversed, NULL is returned.  This
	   function is useful for example in handling the puffs_fs_sync() callback, when cached data for every node should be flushed to stable
	   storage.

     puffs_pn_remove(pn)
	   Signal that a node has been removed from the file system, but do not yet release resources associated with the node.  This will prevent
	   the nodewalk functions from accessing the node.  If necessary, this is usually called from puffs_node_remove() and puffs_node_rmdir().

     puffs_pn_put(pn)
	   Free all resources associated with node pn.	This is typically called from puffs_node_reclaim().

SEE ALSO

     puffs(3)

BSD
								   June 24, 2007							       BSD

Linux and UNIX Man Pages

puffs_flush(3) [netbsd man page]

Check Out this Related Man Page