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freebsd-nq/sys/fs/pseudofs/pseudofs_internal.h

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Let pseudofs into the warmth of the FreeBSD CVS repo. It's not finished yet (I still have to find a way to implement process- dependent nodes without consuming too much memory, and the permission system needs tightening up), but it's becoming hard to work on without a repo (I've accidentally almost nuked it once already), and it works (except for the lack of process-dependent nodes, that is). I was supposed to commit this a week ago, but timed out waiting for jkh to reply to some questions I had. Pass him a spoonful of bad karma :)
2001-04-07 19:51:12 +00:00
/*-
* Copyright (c) 2001 Dag-Erling Co<EFBFBD>dan Sm<EFBFBD>rgrav
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _PSEUDOFS_INTERNAL_H_INCLUDED
#define _PSEUDOFS_INTERNAL_H_INCLUDED
/*
* Sysctl subtree
*/
SYSCTL_DECL(_vfs_pfs);
Add support for process-dependent directories. This means that save for the lack of a man page, pseudofs is mostly complete now.
2001-06-10 18:39:21 +00:00
/*
* Vnode data
*/
struct pfs_vdata {
struct pfs_node *pvd_pn;
pid_t pvd_pid;
[the previous commit to pseudofs_vncache.c got the wrong log message] YA pseudofs megacommit, part 2: - Merge the pfs_vnode and pfs_vdata structures, and make the vnode cache a doubly-linked list. This eliminates the need to walk the list in pfs_vncache_free(). - Add an exit callout which revokes vnodes associated with the process that just exited. Since it needs to lock the cache when it does this, pfs_vncache_mutex needs MTX_RECURSE.
2001-10-01 04:26:33 +00:00
struct vnode *pvd_vnode;
struct pfs_vdata*pvd_prev, *pvd_next;
Add a flag to struct pfs_vdata to mark the vnode as dead (e.g. process- specific nodes when the process exits) Move the vnode-cache-walking loop which was duplicated in pfs_exit() and pfs_disable() into its own function, pfs_purge(), which looks for vnodes marked as dead and / or belonging to the specified pfs_node and reclaims them. Note that this loop is still extremely inefficient. Add a comment in pfs_vncache_alloc() explaining why we have to purge the vnode from the vnode cache before returning, in case anyone should be tempted to remove the call to cache_purge(). Move the special handling for pfstype_root nodes into pfs_fileno_alloc() and pfs_fileno_free() (the root node's fileno must always be 2). This also fixes a bug where pfs_fileno_free() would reclaim the root node's fileno, triggering a panic in the unr code, as that fileno was never allocated from unr to begin with. When destroying a pfs_node, release its fileno and purge it from the vnode cache. I wish we could put off the call to pfs_purge() until after the entire tree had been destroyed, but then we'd have vnodes referencing freed pfs nodes. This probably doesn't matter while we're still under Giant, but might become an issue later. When destroying a pseudofs instance, destroy the tree before tearing down the fileno allocator. In pfs_mount(), acquire the mountpoint interlock when required. MFC after: 3 weeks
2007-04-11 22:40:57 +00:00
int pvd_dead:1;
Add support for process-dependent directories. This means that save for the lack of a man page, pseudofs is mostly complete now.
2001-06-10 18:39:21 +00:00
};
Let pseudofs into the warmth of the FreeBSD CVS repo. It's not finished yet (I still have to find a way to implement process- dependent nodes without consuming too much memory, and the permission system needs tightening up), but it's becoming hard to work on without a repo (I've accidentally almost nuked it once already), and it works (except for the lack of process-dependent nodes, that is). I was supposed to commit this a week ago, but timed out waiting for jkh to reply to some questions I had. Pass him a spoonful of bad karma :)
2001-04-07 19:51:12 +00:00
/*
* Vnode cache
*/
void pfs_vncache_load (void);
void pfs_vncache_unload (void);
int pfs_vncache_alloc (struct mount *, struct vnode **,
Add support for process-dependent directories. This means that save for the lack of a man page, pseudofs is mostly complete now.
2001-06-10 18:39:21 +00:00
struct pfs_node *, pid_t pid);
Let pseudofs into the warmth of the FreeBSD CVS repo. It's not finished yet (I still have to find a way to implement process- dependent nodes without consuming too much memory, and the permission system needs tightening up), but it's becoming hard to work on without a repo (I've accidentally almost nuked it once already), and it works (except for the lack of process-dependent nodes, that is). I was supposed to commit this a week ago, but timed out waiting for jkh to reply to some questions I had. Pass him a spoonful of bad karma :)
2001-04-07 19:51:12 +00:00
int pfs_vncache_free (struct vnode *);
/*
* File number bitmap
*/
void pfs_fileno_init (struct pfs_info *);
void pfs_fileno_uninit (struct pfs_info *);
Further pseudofs improvements: The pfs_info mutex is only needed to lock pi_unrhdr. Everything else in struct pfs_info is modified only while Giant is held (during vfs_init() / vfs_uninit()); add assertions to that effect. Simplify pfs_destroy somewhat. Remove superfluous arguments from pfs_fileno_{alloc,free}(), and the assertions which were added in the previous commit to ensure they were consistent. Assert that Giant is held while the vnode cache is initialized and destroyed. Also assert that the cache is empty when it is destroyed. Rename the vnode cache mutex for consistency. Fix a long-standing bug in pfs_getattr(): it would uncritically return the node's pn_fileno as st_ino. This would result in st_ino being 0 if the node had not previously been visited by readdir(), and also in an incorrect st_ino for process directories and any files contained therein. Correct this by abstracting the fileno manipulations previously done in pfs_readdir() into a new function, pfs_fileno(), which is used by both pfs_getattr() and pfs_readdir().
2007-04-14 14:08:30 +00:00
void pfs_fileno_alloc (struct pfs_node *);
void pfs_fileno_free (struct pfs_node *);
Let pseudofs into the warmth of the FreeBSD CVS repo. It's not finished yet (I still have to find a way to implement process- dependent nodes without consuming too much memory, and the permission system needs tightening up), but it's becoming hard to work on without a repo (I've accidentally almost nuked it once already), and it works (except for the lack of process-dependent nodes, that is). I was supposed to commit this a week ago, but timed out waiting for jkh to reply to some questions I had. Pass him a spoonful of bad karma :)
2001-04-07 19:51:12 +00:00
Make pseudofs (and consequently procfs, linprocfs and linsysfs) MPSAFE.
2007-04-15 17:10:01 +00:00
/*
* Debugging
*/
#ifdef PSEUDOFS_TRACE
extern int pfs_trace;
#define PFS_TRACE(foo) \
do { \
if (pfs_trace) { \
printf("%s(): line %d: ", __func__, __LINE__); \
printf foo ; \
printf("\n"); \
} \
} while (0)
#define PFS_RETURN(err) \
do { \
if (pfs_trace) { \
printf("%s(): line %d: returning %d\n", \
__func__, __LINE__, err); \
} \
return (err); \
} while (0)
#else
#define PFS_TRACE(foo) \
do { /* nothing */ } while (0)
#define PFS_RETURN(err) \
return (err)
#endif
/*
* Inline helpers for locking
*/
static inline void
pfs_lock(struct pfs_node *pn)
{
mtx_lock(&pn->pn_mutex);
}
static inline void
pfs_unlock(struct pfs_node *pn)
{
mtx_unlock(&pn->pn_mutex);
}
static inline void
pfs_assert_owned(struct pfs_node *pn)
{
mtx_assert(&pn->pn_mutex, MA_OWNED);
}
static inline void
pfs_assert_not_owned(struct pfs_node *pn)
{
mtx_assert(&pn->pn_mutex, MA_NOTOWNED);
}
static inline int
pn_fill(PFS_FILL_ARGS)
{
PFS_TRACE(("%s", pn->pn_name));
KASSERT(pn->pn_fill != NULL, ("%s(): no callback", __func__));
if (p != NULL) {
PROC_LOCK_ASSERT(p, MA_NOTOWNED);
PROC_ASSERT_HELD(p);
}
pfs_assert_not_owned(pn);
return ((pn->pn_fill)(PFS_FILL_ARGNAMES));
}
static inline int
pn_attr(PFS_ATTR_ARGS)
{
PFS_TRACE(("%s", pn->pn_name));
KASSERT(pn->pn_attr != NULL, ("%s(): no callback", __func__));
if (p != NULL)
PROC_LOCK_ASSERT(p, MA_OWNED);
pfs_assert_not_owned(pn);
return ((pn->pn_attr)(PFS_ATTR_ARGNAMES));
}
static inline int
pn_vis(PFS_VIS_ARGS)
{
PFS_TRACE(("%s", pn->pn_name));
KASSERT(pn->pn_vis != NULL, ("%s(): no callback", __func__));
KASSERT(p != NULL, ("%s(): no process", __func__));
PROC_LOCK_ASSERT(p, MA_OWNED);
pfs_assert_not_owned(pn);
return ((pn->pn_vis)(PFS_VIS_ARGNAMES));
}
static inline int
pn_ioctl(PFS_IOCTL_ARGS)
{
PFS_TRACE(("%s", pn->pn_name));
KASSERT(pn->pn_ioctl != NULL, ("%s(): no callback", __func__));
if (p != NULL)
PROC_LOCK_ASSERT(p, MA_OWNED);
pfs_assert_not_owned(pn);
return ((pn->pn_ioctl)(PFS_IOCTL_ARGNAMES));
}
static inline int
pn_getextattr(PFS_GETEXTATTR_ARGS)
{
PFS_TRACE(("%s", pn->pn_name));
KASSERT(pn->pn_getextattr != NULL, ("%s(): no callback", __func__));
if (p != NULL)
PROC_LOCK_ASSERT(p, MA_OWNED);
pfs_assert_not_owned(pn);
return ((pn->pn_getextattr)(PFS_GETEXTATTR_ARGNAMES));
}
static inline int
pn_close(PFS_CLOSE_ARGS)
{
PFS_TRACE(("%s", pn->pn_name));
KASSERT(pn->pn_close != NULL, ("%s(): no callback", __func__));
if (p != NULL)
PROC_LOCK_ASSERT(p, MA_OWNED);
pfs_assert_not_owned(pn);
return ((pn->pn_close)(PFS_CLOSE_ARGNAMES));
}
static inline int
pn_destroy(PFS_DESTROY_ARGS)
{
PFS_TRACE(("%s", pn->pn_name));
KASSERT(pn->pn_destroy != NULL, ("%s(): no callback", __func__));
pfs_assert_not_owned(pn);
return ((pn->pn_destroy)(PFS_DESTROY_ARGNAMES));
}
Let pseudofs into the warmth of the FreeBSD CVS repo. It's not finished yet (I still have to find a way to implement process- dependent nodes without consuming too much memory, and the permission system needs tightening up), but it's becoming hard to work on without a repo (I've accidentally almost nuked it once already), and it works (except for the lack of process-dependent nodes, that is). I was supposed to commit this a week ago, but timed out waiting for jkh to reply to some questions I had. Pass him a spoonful of bad karma :)
2001-04-07 19:51:12 +00:00
#endif
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