2 * Copyright (c) 2011-2012 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@dragonflybsd.org>
6 * by Venkatesh Srinivas <vsrinivas@dragonflybsd.org>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include <sys/cdefs.h>
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/types.h>
45 * Adding a ref to an inode is only legal if the inode already has at least
49 hammer2_inode_ref(hammer2_inode_t *ip)
51 hammer2_chain_ref(ip->hmp, &ip->chain);
55 * Drop an inode reference, freeing the inode when the last reference goes
59 hammer2_inode_drop(hammer2_inode_t *ip)
61 hammer2_chain_drop(ip->hmp, &ip->chain);
65 * Get the vnode associated with the given inode, allocating the vnode if
68 * Great care must be taken to avoid deadlocks and vnode acquisition/reclaim
71 * The vnode will be returned exclusively locked and referenced. The
72 * reference on the vnode prevents it from being reclaimed.
74 * The inode (ip) must be referenced by the caller and not locked to avoid
75 * it getting ripped out from under us or deadlocked.
78 hammer2_igetv(hammer2_inode_t *ip, int *errorp)
81 hammer2_pfsmount_t *pmp;
84 KKASSERT(pmp != NULL);
89 * Attempt to reuse an existing vnode assignment. It is
90 * possible to race a reclaim so the vget() may fail. The
91 * inode must be unlocked during the vget() to avoid a
92 * deadlock against a reclaim.
97 * Lock the inode and check for a reclaim race
99 hammer2_inode_lock_ex(ip);
101 hammer2_inode_unlock_ex(ip);
106 * Inode must be unlocked during the vget() to avoid
107 * possible deadlocks, vnode is held to prevent
108 * destruction during the vget(). The vget() can
109 * still fail if we lost a reclaim race on the vnode.
111 vhold_interlocked(vp);
112 hammer2_inode_unlock_ex(ip);
113 if (vget(vp, LK_EXCLUSIVE)) {
118 /* vp still locked and ref from vget */
124 * No vnode exists, allocate a new vnode. Beware of
125 * allocation races. This function will return an
126 * exclusively locked and referenced vnode.
128 *errorp = getnewvnode(VT_HAMMER2, pmp->mp, &vp, 0, 0);
135 * Lock the inode and check for an allocation race.
137 hammer2_inode_lock_ex(ip);
138 if (ip->vp != NULL) {
141 hammer2_inode_unlock_ex(ip);
145 switch (ip->ip_data.type) {
146 case HAMMER2_OBJTYPE_DIRECTORY:
149 case HAMMER2_OBJTYPE_REGFILE:
151 vinitvmio(vp, ip->ip_data.size,
153 (int)ip->ip_data.size & HAMMER2_LBUFMASK);
155 case HAMMER2_OBJTYPE_SOFTLINK:
157 * XXX for now we are using the generic file_read
158 * and file_write code so we need a buffer cache
162 vinitvmio(vp, ip->ip_data.size,
164 (int)ip->ip_data.size & HAMMER2_LBUFMASK);
168 panic("hammer2: unhandled objtype %d",
173 if (ip == pmp->iroot)
174 vsetflags(vp, VROOT);
178 hammer2_chain_ref(ip->hmp, &ip->chain); /* vp association */
179 hammer2_inode_unlock_ex(ip);
184 * Return non-NULL vp and *errorp == 0, or NULL vp and *errorp != 0.
186 if (hammer2_debug & 0x0002) {
187 kprintf("igetv vp %p refs %d aux %d\n",
188 vp, vp->v_sysref.refcnt, vp->v_auxrefs);
194 * Create a new inode in the specified directory using the vattr to
195 * figure out the type of inode.
197 * If no error occurs the new inode with its chain locked is returned in
198 * *nipp, otherwise an error is returned and *nipp is set to NULL.
200 * If vap and/or cred are NULL the related fields are not set and the
201 * inode type defaults to a directory. This is used when creating PFSs
202 * under the super-root, so the inode number is set to 1 in this case.
205 hammer2_inode_create(hammer2_inode_t *dip,
206 struct vattr *vap, struct ucred *cred,
207 const uint8_t *name, size_t name_len,
208 hammer2_inode_t **nipp)
210 hammer2_mount_t *hmp = dip->hmp;
211 hammer2_chain_t *chain;
212 hammer2_chain_t *parent;
213 hammer2_inode_t *nip;
218 lhc = hammer2_dirhash(name, name_len);
221 * Locate the inode or indirect block to create the new
222 * entry in. At the same time check for key collisions
223 * and iterate until we don't get one.
225 parent = &dip->chain;
226 hammer2_chain_lock(hmp, parent, HAMMER2_RESOLVE_ALWAYS);
230 chain = hammer2_chain_lookup(hmp, &parent, lhc, lhc, 0);
233 if ((lhc & HAMMER2_DIRHASH_LOMASK) == HAMMER2_DIRHASH_LOMASK)
235 hammer2_chain_unlock(hmp, chain);
240 chain = hammer2_chain_create(hmp, parent, NULL, lhc, 0,
241 HAMMER2_BREF_TYPE_INODE,
242 HAMMER2_INODE_BYTES);
246 hammer2_chain_unlock(hmp, parent);
249 * Handle the error case
252 KKASSERT(chain == NULL);
258 * Set up the new inode
263 hammer2_voldata_lock(hmp);
265 nip->ip_data.type = hammer2_get_obj_type(vap->va_type);
266 nip->ip_data.inum = hmp->voldata.alloc_tid++;
267 /* XXX modify/lock */
269 nip->ip_data.type = HAMMER2_OBJTYPE_DIRECTORY;
270 nip->ip_data.inum = 1;
272 hammer2_voldata_unlock(hmp);
273 nip->ip_data.version = HAMMER2_INODE_VERSION_ONE;
274 hammer2_update_time(&nip->ip_data.ctime);
275 nip->ip_data.mtime = nip->ip_data.ctime;
277 nip->ip_data.mode = vap->va_mode;
278 nip->ip_data.nlinks = 1;
281 xuid = hammer2_to_unix_xid(&dip->ip_data.uid);
282 xuid = vop_helper_create_uid(dip->pmp->mp,
290 if (vap->va_vaflags & VA_UID_UUID_VALID)
291 nip->ip_data.uid = vap->va_uid_uuid;
292 else if (vap->va_uid != (uid_t)VNOVAL)
293 hammer2_guid_to_uuid(&nip->ip_data.uid, vap->va_uid);
295 hammer2_guid_to_uuid(&nip->ip_data.uid, xuid);
297 if (vap->va_vaflags & VA_GID_UUID_VALID)
298 nip->ip_data.gid = vap->va_gid_uuid;
299 else if (vap->va_gid != (gid_t)VNOVAL)
300 hammer2_guid_to_uuid(&nip->ip_data.gid, vap->va_gid);
302 nip->ip_data.gid = dip->ip_data.gid;
306 * Regular files and softlinks allow a small amount of data to be
307 * directly embedded in the inode. This flag will be cleared if
308 * the size is extended past the embedded limit.
310 if (nip->ip_data.type == HAMMER2_OBJTYPE_REGFILE ||
311 nip->ip_data.type == HAMMER2_OBJTYPE_SOFTLINK) {
312 nip->ip_data.op_flags |= HAMMER2_OPFLAG_DIRECTDATA;
315 KKASSERT(name_len < HAMMER2_INODE_MAXNAME);
316 bcopy(name, nip->ip_data.filename, name_len);
317 nip->ip_data.name_key = lhc;
318 nip->ip_data.name_len = name_len;
324 * Connect inode (ip) to the specified directory using the specified name.
325 * (ip) must be locked.
327 * If (ip) represents a hidden hardlink target file then the inode we create
328 * for the directory entry will be setup as OBJTYPE_HARDLINK.
331 hammer2_inode_connect(hammer2_inode_t *dip, hammer2_inode_t *ip,
332 const uint8_t *name, size_t name_len)
334 hammer2_mount_t *hmp = dip->hmp;
335 hammer2_chain_t *chain;
336 hammer2_chain_t *parent;
340 lhc = hammer2_dirhash(name, name_len);
343 * Locate the inode or indirect block to create the new
344 * entry in. At the same time check for key collisions
345 * and iterate until we don't get one.
347 parent = &dip->chain;
348 hammer2_chain_lock(hmp, parent, HAMMER2_RESOLVE_ALWAYS);
352 chain = hammer2_chain_lookup(hmp, &parent, lhc, lhc, 0);
355 if ((lhc & HAMMER2_DIRHASH_LOMASK) == HAMMER2_DIRHASH_LOMASK)
357 hammer2_chain_unlock(hmp, chain);
363 * Passing a non-NULL chain to hammer2_chain_create() reconnects the
364 * existing chain instead of creating a new one. The chain's bref
365 * will be properly updated.
368 chain = hammer2_chain_create(hmp, parent, &ip->chain, lhc, 0,
369 HAMMER2_BREF_TYPE_INODE /* n/a */,
370 HAMMER2_INODE_BYTES); /* n/a */
374 hammer2_chain_unlock(hmp, parent);
377 * Handle the error case
380 KKASSERT(chain == NULL);
385 * Directory entries are inodes so if the name has changed we have
386 * to update the inode.
388 if (ip->ip_data.name_len != name_len ||
389 bcmp(ip->ip_data.filename, name, name_len) != 0) {
390 hammer2_chain_modify(hmp, chain, 0);
391 KKASSERT(name_len < HAMMER2_INODE_MAXNAME);
392 bcopy(name, ip->ip_data.filename, name_len);
393 ip->ip_data.name_key = lhc;
394 ip->ip_data.name_len = name_len;
396 /*nip->ip_data.nlinks = 1;*/
402 * Unlink the file from the specified directory inode. The directory inode
403 * does not need to be locked.
405 * isdir determines whether a directory/non-directory check should be made.
406 * No check is made if isdir is set to -1.
408 * adjlinks tells unlink that we want to adjust the nlinks count of the
409 * inode. When removing the last link for a NON forwarding entry we can
410 * just ignore the link count... no point updating the inode that we are
411 * about to dereference, it would just result in a lot of wasted I/O.
413 * However, if the entry is a forwarding entry (aka a hardlink), and adjlinks
414 * is non-zero, we have to locate the hardlink and adjust its nlinks field.
417 hammer2_unlink_file(hammer2_inode_t *dip,
418 const uint8_t *name, size_t name_len, int isdir)
420 hammer2_mount_t *hmp;
421 hammer2_chain_t *parent;
422 hammer2_chain_t *chain;
423 hammer2_chain_t *dparent;
424 hammer2_chain_t *dchain;
431 lhc = hammer2_dirhash(name, name_len);
434 * Search for the filename in the directory
436 parent = &dip->chain;
437 hammer2_chain_lock(hmp, parent, HAMMER2_RESOLVE_ALWAYS);
438 chain = hammer2_chain_lookup(hmp, &parent,
439 lhc, lhc + HAMMER2_DIRHASH_LOMASK,
442 if (chain->bref.type == HAMMER2_BREF_TYPE_INODE &&
444 name_len == chain->data->ipdata.name_len &&
445 bcmp(name, chain->data->ipdata.filename, name_len) == 0) {
448 chain = hammer2_chain_next(hmp, &parent, chain,
449 lhc, lhc + HAMMER2_DIRHASH_LOMASK,
454 * Not found or wrong type (isdir < 0 disables the type check).
457 hammer2_chain_unlock(hmp, parent);
460 if (chain->data->ipdata.type == HAMMER2_OBJTYPE_DIRECTORY &&
465 if (chain->data->ipdata.type != HAMMER2_OBJTYPE_DIRECTORY &&
472 * If this is a directory the directory must be empty. However, if
473 * isdir < 0 we are doing a rename and the directory does not have
476 if (chain->data->ipdata.type == HAMMER2_OBJTYPE_DIRECTORY &&
479 hammer2_chain_lock(hmp, dparent, HAMMER2_RESOLVE_ALWAYS);
480 dchain = hammer2_chain_lookup(hmp, &dparent,
481 0, (hammer2_key_t)-1,
482 HAMMER2_LOOKUP_NODATA);
484 hammer2_chain_unlock(hmp, dchain);
485 hammer2_chain_unlock(hmp, dparent);
489 hammer2_chain_unlock(hmp, dparent);
495 * Found, the chain represents the inode. Remove the parent reference
496 * to the chain. The chain itself is no longer referenced and will
497 * be marked unmodified by hammer2_chain_delete(), avoiding unnecessary
500 hammer2_chain_delete(hmp, parent, chain);
501 /* XXX nlinks (hardlink special case) */
502 /* XXX nlinks (parent directory) */
507 hammer2_chain_unlock(hmp, chain);
508 hammer2_chain_unlock(hmp, parent);
514 * Calculate the allocation size for the file fragment straddling EOF
517 hammer2_inode_calc_alloc(hammer2_key_t filesize)
519 int frag = (int)filesize & HAMMER2_PBUFMASK;
524 for (radix = HAMMER2_MINALLOCRADIX; frag > (1 << radix); ++radix)
530 hammer2_inode_lock_nlinks(hammer2_inode_t *ip)
532 hammer2_chain_ref(ip->hmp, &ip->chain);
536 hammer2_inode_unlock_nlinks(hammer2_inode_t *ip)
538 hammer2_chain_drop(ip->hmp, &ip->chain);
542 * Consolidate for hard link creation. This moves the specified terminal
543 * hardlink inode to a directory common to its current directory and tdip
544 * if necessary, replacing *ipp with the new inode chain element and
545 * modifying the original inode chain element to OBJTYPE_HARDLINK.
547 * The link count is bumped if requested.
550 hammer2_hardlink_consolidate(hammer2_inode_t **ipp, hammer2_inode_t *tdip,
553 if (hammer2_hardlink_enable < 0)
555 if (hammer2_hardlink_enable == 0)
562 * If (*ipp) is non-NULL it points to the forward OBJTYPE_HARDLINK inode while
563 * (*chainp) points to the resolved (hidden hardlink target) inode. In this
564 * situation when nlinks is 1 we wish to deconsolidate the hardlink, moving
565 * it back to the directory that now represents the only remaining link.
568 hammer2_hardlink_deconsolidate(hammer2_inode_t *dip, hammer2_chain_t **chainp,
569 hammer2_inode_t **ipp)
578 * When presented with a (*chainp) representing an inode of type
579 * OBJTYPE_HARDLINK this code will save the original inode (with a ref)
580 * in (*ipp), and then locate the hidden hardlink target in (dip) or
581 * any parent directory above (dip). The locked (*chainp) is replaced
582 * with a new locked (*chainp) representing the hardlink target.
585 hammer2_hardlink_find(hammer2_inode_t *dip, hammer2_chain_t **chainp,
586 hammer2_inode_t **ipp)