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tmpfs_vfsops.c (182739) tmpfs_vfsops.c (191990)
1/* $NetBSD: tmpfs_vfsops.c,v 1.10 2005/12/11 12:24:29 christos Exp $ */
2
3/*-
4 * Copyright (c) 2005 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code

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36 * tmpfs is a file system that uses NetBSD's virtual memory sub-system
37 * (the well-known UVM) to store file data and metadata in an efficient
38 * way. This means that it does not follow the structure of an on-disk
39 * file system because it simply does not need to. Instead, it uses
40 * memory-specific data structures and algorithms to automatically
41 * allocate and release resources.
42 */
43#include <sys/cdefs.h>
1/* $NetBSD: tmpfs_vfsops.c,v 1.10 2005/12/11 12:24:29 christos Exp $ */
2
3/*-
4 * Copyright (c) 2005 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Julio M. Merino Vidal, developed as part of Google's Summer of Code

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36 * tmpfs is a file system that uses NetBSD's virtual memory sub-system
37 * (the well-known UVM) to store file data and metadata in an efficient
38 * way. This means that it does not follow the structure of an on-disk
39 * file system because it simply does not need to. Instead, it uses
40 * memory-specific data structures and algorithms to automatically
41 * allocate and release resources.
42 */
43#include <sys/cdefs.h>
44__FBSDID("$FreeBSD: head/sys/fs/tmpfs/tmpfs_vfsops.c 182739 2008-09-03 18:53:48Z delphij $");
44__FBSDID("$FreeBSD: head/sys/fs/tmpfs/tmpfs_vfsops.c 191990 2009-05-11 15:33:26Z attilio $");
45
46#include <sys/param.h>
47#include <sys/limits.h>
48#include <sys/lock.h>
49#include <sys/mutex.h>
50#include <sys/kernel.h>
51#include <sys/stat.h>
52#include <sys/systm.h>

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63 */
64#define TMPFS_DEFAULT_ROOT_MODE (S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
65
66MALLOC_DEFINE(M_TMPFSMNT, "tmpfs mount", "tmpfs mount structures");
67MALLOC_DEFINE(M_TMPFSNAME, "tmpfs name", "tmpfs file names");
68
69/* --------------------------------------------------------------------- */
70
45
46#include <sys/param.h>
47#include <sys/limits.h>
48#include <sys/lock.h>
49#include <sys/mutex.h>
50#include <sys/kernel.h>
51#include <sys/stat.h>
52#include <sys/systm.h>

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63 */
64#define TMPFS_DEFAULT_ROOT_MODE (S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
65
66MALLOC_DEFINE(M_TMPFSMNT, "tmpfs mount", "tmpfs mount structures");
67MALLOC_DEFINE(M_TMPFSNAME, "tmpfs name", "tmpfs file names");
68
69/* --------------------------------------------------------------------- */
70
71static int tmpfs_mount(struct mount *, struct thread *);
72static int tmpfs_unmount(struct mount *, int, struct thread *);
73static int tmpfs_root(struct mount *, int flags, struct vnode **,
74 struct thread *);
71static int tmpfs_mount(struct mount *);
72static int tmpfs_unmount(struct mount *, int);
73static int tmpfs_root(struct mount *, int flags, struct vnode **);
75static int tmpfs_fhtovp(struct mount *, struct fid *, struct vnode **);
74static int tmpfs_fhtovp(struct mount *, struct fid *, struct vnode **);
76static int tmpfs_statfs(struct mount *, struct statfs *, struct thread *);
75static int tmpfs_statfs(struct mount *, struct statfs *);
77
78/* --------------------------------------------------------------------- */
79
80static const char *tmpfs_opts[] = {
81 "from", "size", "inodes", "uid", "gid", "mode", "export",
82 NULL
83};
84

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173tmpfs_node_fini(void *mem, int size)
174{
175 struct tmpfs_node *node = (struct tmpfs_node *)mem;
176
177 mtx_destroy(&node->tn_interlock);
178}
179
180static int
76
77/* --------------------------------------------------------------------- */
78
79static const char *tmpfs_opts[] = {
80 "from", "size", "inodes", "uid", "gid", "mode", "export",
81 NULL
82};
83

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172tmpfs_node_fini(void *mem, int size)
173{
174 struct tmpfs_node *node = (struct tmpfs_node *)mem;
175
176 mtx_destroy(&node->tn_interlock);
177}
178
179static int
181tmpfs_mount(struct mount *mp, struct thread *td)
180tmpfs_mount(struct mount *mp)
182{
183 struct tmpfs_mount *tmp;
184 struct tmpfs_node *root;
185 size_t pages, mem_size;
186 ino_t nodes;
187 int error;
188 /* Size counters. */
189 ino_t nodes_max;

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273 sizeof(struct tmpfs_node),
274 tmpfs_node_ctor, tmpfs_node_dtor,
275 tmpfs_node_init, tmpfs_node_fini,
276 UMA_ALIGN_PTR, 0);
277
278 /* Allocate the root node. */
279 error = tmpfs_alloc_node(tmp, VDIR, root_uid,
280 root_gid, root_mode & ALLPERMS, NULL, NULL,
181{
182 struct tmpfs_mount *tmp;
183 struct tmpfs_node *root;
184 size_t pages, mem_size;
185 ino_t nodes;
186 int error;
187 /* Size counters. */
188 ino_t nodes_max;

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272 sizeof(struct tmpfs_node),
273 tmpfs_node_ctor, tmpfs_node_dtor,
274 tmpfs_node_init, tmpfs_node_fini,
275 UMA_ALIGN_PTR, 0);
276
277 /* Allocate the root node. */
278 error = tmpfs_alloc_node(tmp, VDIR, root_uid,
279 root_gid, root_mode & ALLPERMS, NULL, NULL,
281 VNOVAL, td, &root);
280 VNOVAL, &root);
282
283 if (error != 0 || root == NULL) {
284 uma_zdestroy(tmp->tm_node_pool);
285 uma_zdestroy(tmp->tm_dirent_pool);
286 delete_unrhdr(tmp->tm_ino_unr);
287 free(tmp, M_TMPFSMNT);
288 return error;
289 }

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302
303 return 0;
304}
305
306/* --------------------------------------------------------------------- */
307
308/* ARGSUSED2 */
309static int
281
282 if (error != 0 || root == NULL) {
283 uma_zdestroy(tmp->tm_node_pool);
284 uma_zdestroy(tmp->tm_dirent_pool);
285 delete_unrhdr(tmp->tm_ino_unr);
286 free(tmp, M_TMPFSMNT);
287 return error;
288 }

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301
302 return 0;
303}
304
305/* --------------------------------------------------------------------- */
306
307/* ARGSUSED2 */
308static int
310tmpfs_unmount(struct mount *mp, int mntflags, struct thread *l)
309tmpfs_unmount(struct mount *mp, int mntflags)
311{
312 int error;
313 int flags = 0;
314 struct tmpfs_mount *tmp;
315 struct tmpfs_node *node;
316
317 /* Handle forced unmounts. */
318 if (mntflags & MNT_FORCE)
319 flags |= FORCECLOSE;
320
321 /* Finalize all pending I/O. */
310{
311 int error;
312 int flags = 0;
313 struct tmpfs_mount *tmp;
314 struct tmpfs_node *node;
315
316 /* Handle forced unmounts. */
317 if (mntflags & MNT_FORCE)
318 flags |= FORCECLOSE;
319
320 /* Finalize all pending I/O. */
322 error = vflush(mp, 0, flags, l);
321 error = vflush(mp, 0, flags, curthread);
323 if (error != 0)
324 return error;
325
326 tmp = VFS_TO_TMPFS(mp);
327
328 /* Free all associated data. The loop iterates over the linked list
329 * we have containing all used nodes. For each of them that is
330 * a directory, we free all its directory entries. Note that after

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369 mp->mnt_flag &= ~MNT_LOCAL;
370 MNT_IUNLOCK(mp);
371 return 0;
372}
373
374/* --------------------------------------------------------------------- */
375
376static int
322 if (error != 0)
323 return error;
324
325 tmp = VFS_TO_TMPFS(mp);
326
327 /* Free all associated data. The loop iterates over the linked list
328 * we have containing all used nodes. For each of them that is
329 * a directory, we free all its directory entries. Note that after

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368 mp->mnt_flag &= ~MNT_LOCAL;
369 MNT_IUNLOCK(mp);
370 return 0;
371}
372
373/* --------------------------------------------------------------------- */
374
375static int
377tmpfs_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td)
376tmpfs_root(struct mount *mp, int flags, struct vnode **vpp)
378{
379 int error;
377{
378 int error;
380 error = tmpfs_alloc_vp(mp, VFS_TO_TMPFS(mp)->tm_root, flags, vpp, td);
379 error = tmpfs_alloc_vp(mp, VFS_TO_TMPFS(mp)->tm_root, flags, vpp);
381
382 if (!error)
383 (*vpp)->v_vflag |= VV_ROOT;
384
385 return error;
386}
387
388/* --------------------------------------------------------------------- */

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412 node->tn_gen == tfhp->tf_gen) {
413 found = TRUE;
414 break;
415 }
416 }
417 TMPFS_UNLOCK(tmp);
418
419 if (found)
380
381 if (!error)
382 (*vpp)->v_vflag |= VV_ROOT;
383
384 return error;
385}
386
387/* --------------------------------------------------------------------- */

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411 node->tn_gen == tfhp->tf_gen) {
412 found = TRUE;
413 break;
414 }
415 }
416 TMPFS_UNLOCK(tmp);
417
418 if (found)
420 return (tmpfs_alloc_vp(mp, node, LK_EXCLUSIVE, vpp, curthread));
419 return (tmpfs_alloc_vp(mp, node, LK_EXCLUSIVE, vpp));
421
422 return (EINVAL);
423}
424
425/* --------------------------------------------------------------------- */
426
427/* ARGSUSED2 */
428static int
420
421 return (EINVAL);
422}
423
424/* --------------------------------------------------------------------- */
425
426/* ARGSUSED2 */
427static int
429tmpfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *l)
428tmpfs_statfs(struct mount *mp, struct statfs *sbp)
430{
431 fsfilcnt_t freenodes;
432 struct tmpfs_mount *tmp;
433
434 tmp = VFS_TO_TMPFS(mp);
435
436 sbp->f_iosize = PAGE_SIZE;
437 sbp->f_bsize = PAGE_SIZE;

--- 28 unchanged lines hidden --- 		429{
430 fsfilcnt_t freenodes;
431 struct tmpfs_mount *tmp;
432
433 tmp = VFS_TO_TMPFS(mp);
434
435 sbp->f_iosize = PAGE_SIZE;
436 sbp->f_bsize = PAGE_SIZE;

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