Bug Summary

File:ufs/ufs/ufs_lookup.c
Warning:line 618, column 2
Value stored to 'dp' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.4 -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name ufs_lookup.c -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model static -mframe-pointer=all -relaxed-aliasing -ffp-contract=on -fno-rounding-math -mconstructor-aliases -ffreestanding -mcmodel=kernel -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -target-feature -sse2 -target-feature -sse -target-feature -3dnow -target-feature -mmx -target-feature +save-args -target-feature +retpoline-external-thunk -disable-red-zone -no-implicit-float -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/sys/arch/amd64/compile/GENERIC.MP/obj -nostdsysteminc -nobuiltininc -resource-dir /usr/local/llvm16/lib/clang/16 -I /usr/src/sys -I /usr/src/sys/arch/amd64/compile/GENERIC.MP/obj -I /usr/src/sys/arch -I /usr/src/sys/dev/pci/drm/include -I /usr/src/sys/dev/pci/drm/include/uapi -I /usr/src/sys/dev/pci/drm/amd/include/asic_reg -I /usr/src/sys/dev/pci/drm/amd/include -I /usr/src/sys/dev/pci/drm/amd/amdgpu -I /usr/src/sys/dev/pci/drm/amd/display -I /usr/src/sys/dev/pci/drm/amd/display/include -I /usr/src/sys/dev/pci/drm/amd/display/dc -I /usr/src/sys/dev/pci/drm/amd/display/amdgpu_dm -I /usr/src/sys/dev/pci/drm/amd/pm/inc -I /usr/src/sys/dev/pci/drm/amd/pm/legacy-dpm -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/inc -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/smu11 -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/smu12 -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/smu13 -I /usr/src/sys/dev/pci/drm/amd/pm/powerplay/inc -I /usr/src/sys/dev/pci/drm/amd/pm/powerplay/hwmgr -I /usr/src/sys/dev/pci/drm/amd/pm/powerplay/smumgr -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/inc -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/inc/pmfw_if -I /usr/src/sys/dev/pci/drm/amd/display/dc/inc -I /usr/src/sys/dev/pci/drm/amd/display/dc/inc/hw -I /usr/src/sys/dev/pci/drm/amd/display/dc/clk_mgr -I /usr/src/sys/dev/pci/drm/amd/display/modules/inc -I /usr/src/sys/dev/pci/drm/amd/display/modules/hdcp -I /usr/src/sys/dev/pci/drm/amd/display/dmub/inc -I /usr/src/sys/dev/pci/drm/i915 -D DDB -D DIAGNOSTIC -D KTRACE -D ACCOUNTING -D KMEMSTATS -D PTRACE -D POOL_DEBUG -D CRYPTO -D SYSVMSG -D SYSVSEM -D SYSVSHM -D UVM_SWAP_ENCRYPT -D FFS -D FFS2 -D FFS_SOFTUPDATES -D UFS_DIRHASH -D QUOTA -D EXT2FS -D MFS -D NFSCLIENT -D NFSSERVER -D CD9660 -D UDF -D MSDOSFS -D FIFO -D FUSE -D SOCKET_SPLICE -D TCP_ECN -D TCP_SIGNATURE -D INET6 -D IPSEC -D PPP_BSDCOMP -D PPP_DEFLATE -D PIPEX -D MROUTING -D MPLS -D BOOT_CONFIG -D USER_PCICONF -D APERTURE -D MTRR -D NTFS -D SUSPEND -D HIBERNATE -D PCIVERBOSE -D USBVERBOSE -D WSDISPLAY_COMPAT_USL -D WSDISPLAY_COMPAT_RAWKBD -D WSDISPLAY_DEFAULTSCREENS=6 -D X86EMU -D ONEWIREVERBOSE -D MULTIPROCESSOR -D MAXUSERS=80 -D _KERNEL -O2 -Wno-pointer-sign -Wno-address-of-packed-member -Wno-constant-conversion -Wno-unused-but-set-variable -Wno-gnu-folding-constant -fdebug-compilation-dir=/usr/src/sys/arch/amd64/compile/GENERIC.MP/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fcf-protection=branch -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -o /home/ben/Projects/scan/2024-01-11-110808-61670-1 -x c /usr/src/sys/ufs/ufs/ufs_lookup.c
1/* $OpenBSD: ufs_lookup.c,v 1.60 2024/01/09 03:15:59 guenther Exp $ */
2/* $NetBSD: ufs_lookup.c,v 1.7 1996/02/09 22:36:06 christos Exp $ */
3
4/*
5 * Copyright (c) 1989, 1993
6 * The Regents of the University of California. All rights reserved.
7 * (c) UNIX System Laboratories, Inc.
8 * All or some portions of this file are derived from material licensed
9 * to the University of California by American Telephone and Telegraph
10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
11 * the permission of UNIX System Laboratories, Inc.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * @(#)ufs_lookup.c 8.9 (Berkeley) 8/11/94
38 */
39
40#include <sys/param.h>
41#include <sys/systm.h>
42#include <sys/kernel.h>
43#include <sys/namei.h>
44#include <sys/buf.h>
45#include <sys/stat.h>
46#include <sys/mount.h>
47#include <sys/proc.h>
48#include <sys/vnode.h>
49
50#include <ufs/ufs/quota.h>
51#include <ufs/ufs/inode.h>
52#include <ufs/ufs/dir.h>
53#ifdef UFS_DIRHASH1
54#include <ufs/ufs/dirhash.h>
55#endif
56#include <ufs/ufs/ufsmount.h>
57#include <ufs/ufs/ufs_extern.h>
58
59extern struct nchstats nchstats;
60
61#ifdef DIAGNOSTIC1
62int dirchk = 1;
63#else
64int dirchk = 0;
65#endif
66
67/*
68 * Convert a component of a pathname into a pointer to a locked inode.
69 * This is a very central and rather complicated routine.
70 * If the file system is not maintained in a strict tree hierarchy,
71 * this can result in a deadlock situation (see comments in code below).
72 *
73 * The cnp->cn_nameiop argument is LOOKUP, CREATE, RENAME, or DELETE depending
74 * on whether the name is to be looked up, created, renamed, or deleted.
75 * When CREATE, RENAME, or DELETE is specified, information usable in
76 * creating, renaming, or deleting a directory entry may be calculated.
77 * If flag has LOCKPARENT or'ed into it and the target of the pathname
78 * exists, lookup returns both the target and its parent directory locked.
79 * When creating or renaming and LOCKPARENT is specified, the target may
80 * not be ".". When deleting and LOCKPARENT is specified, the target may
81 * be "."., but the caller must check to ensure it does an vrele and vput
82 * instead of two vputs.
83 *
84 * Overall outline of ufs_lookup:
85 *
86 * check accessibility of directory
87 * look for name in cache, if found, then if at end of path
88 * and deleting or creating, drop it, else return name
89 * search for name in directory, to found or notfound
90 * notfound:
91 * if creating, return locked directory, leaving info on available slots
92 * else return error
93 * found:
94 * if at end of path and deleting, return information to allow delete
95 * if at end of path and rewriting (RENAME and LOCKPARENT), lock target
96 * inode and return info to allow rewrite
97 * if not at end, add name to cache; if at end and neither creating
98 * nor deleting, add name to cache
99 */
100int
101ufs_lookup(void *v)
102{
103 struct vop_lookup_args *ap = v;
104 struct vnode *vdp; /* vnode for directory being searched */
105 struct inode *dp; /* inode for directory being searched */
106 struct buf *bp; /* a buffer of directory entries */
107 struct direct *ep; /* the current directory entry */
108 int entryoffsetinblock; /* offset of ep in bp's buffer */
109 enum {NONE, COMPACT, FOUND} slotstatus;
110 doff_tint32_t slotoffset; /* offset of area with free space */
111 int slotsize; /* size of area at slotoffset */
112 int slotfreespace; /* amount of space free in slot */
113 int slotneeded; /* size of the entry we're seeking */
114 int numdirpasses; /* strategy for directory search */
115 doff_tint32_t endsearch; /* offset to end directory search */
116 doff_tint32_t prevoff; /* prev entry dp->i_offset */
117 struct vnode *pdp; /* saved dp during symlink work */
118 struct vnode *tdp; /* returned by VFS_VGET */
119 doff_tint32_t enduseful; /* pointer past last used dir slot */
120 u_long bmask; /* block offset mask */
121 int lockparent; /* 1 => lockparent flag is set */
122 int wantparent; /* 1 => wantparent or lockparent flag */
123 int namlen, error;
124 struct vnode **vpp = ap->a_vpp;
125 struct componentname *cnp = ap->a_cnp;
126 struct ucred *cred = cnp->cn_cred;
127 int flags;
128 int nameiop = cnp->cn_nameiop;
129
130 cnp->cn_flags &= ~PDIRUNLOCK0x200000;
131 flags = cnp->cn_flags;
132
133 bp = NULL((void *)0);
134 slotoffset = -1;
135 *vpp = NULL((void *)0);
136 vdp = ap->a_dvp;
137 dp = VTOI(vdp)((struct inode *)(vdp)->v_data);
138 lockparent = flags & LOCKPARENT0x0008;
139 wantparent = flags & (LOCKPARENT0x0008|WANTPARENT0x0010);
140
141 /*
142 * Check accessibility of directory.
143 */
144 if ((DIP(dp, mode)(((dp)->i_ump->um_fstype == 1) ? (dp)->dinode_u.ffs1_din
->di_mode : (dp)->dinode_u.ffs2_din->di_mode) & IFMT0170000) != IFDIR0040000)
145 return (ENOTDIR20);
146 if ((error = VOP_ACCESS(vdp, VEXEC00100, cred, cnp->cn_proc)) != 0)
147 return (error);
148
149 if ((flags & ISLASTCN0x008000) && (vdp->v_mount->mnt_flag & MNT_RDONLY0x00000001) &&
150 (cnp->cn_nameiop == DELETE2 || cnp->cn_nameiop == RENAME3))
151 return (EROFS30);
152
153 /*
154 * We now have a segment name to search for, and a directory to search.
155 *
156 * Before tediously performing a linear scan of the directory,
157 * check the name cache to see if the directory/name pair
158 * we are looking for is known already.
159 */
160 if ((error = cache_lookup(vdp, vpp, cnp)) >= 0)
161 return (error);
162
163 /*
164 * Suppress search for slots unless creating
165 * file and at end of pathname, in which case
166 * we watch for a place to put the new file in
167 * case it doesn't already exist.
168 */
169 slotstatus = FOUND;
170 slotfreespace = slotsize = slotneeded = 0;
171 if ((nameiop == CREATE1 || nameiop == RENAME3) &&
172 (flags & ISLASTCN0x008000)) {
173 slotstatus = NONE;
174 slotneeded = (sizeof(struct direct) - MAXNAMLEN255 +
175 cnp->cn_namelen + 3) &~ 3;
176 }
177
178 /*
179 * If there is cached information on a previous search of
180 * this directory, pick up where we last left off.
181 * We cache only lookups as these are the most common
182 * and have the greatest payoff. Caching CREATE has little
183 * benefit as it usually must search the entire directory
184 * to determine that the entry does not exist. Caching the
185 * location of the last DELETE or RENAME has not reduced
186 * profiling time and hence has been removed in the interest
187 * of simplicity.
188 */
189 bmask = VFSTOUFS(vdp->v_mount)((struct ufsmount *)((vdp->v_mount)->mnt_data))->um_mountp->mnt_stat.f_iosize - 1;
190
191#ifdef UFS_DIRHASH1
192 /*
193 * Use dirhash for fast operations on large directories. The logic
194 * to determine whether to hash the directory is contained within
195 * ufsdirhash_build(); a zero return means that it decided to hash
196 * this directory and it successfully built up the hash table.
197 */
198 if (ufsdirhash_build(dp) == 0) {
199 /* Look for a free slot if needed. */
200 enduseful = DIP(dp, size)(((dp)->i_ump->um_fstype == 1) ? (dp)->dinode_u.ffs1_din
->di_size : (dp)->dinode_u.ffs2_din->di_size);
201 if (slotstatus != FOUND) {
202 slotoffset = ufsdirhash_findfree(dp, slotneeded,
203 &slotsize);
204 if (slotoffset >= 0) {
205 slotstatus = COMPACT;
206 enduseful = ufsdirhash_enduseful(dp);
207 if (enduseful < 0)
208 enduseful = DIP(dp, size)(((dp)->i_ump->um_fstype == 1) ? (dp)->dinode_u.ffs1_din
->di_size : (dp)->dinode_u.ffs2_din->di_size);
209 }
210 }
211 /* Look up the component. */
212 numdirpasses = 1;
213 entryoffsetinblock = 0; /* silence compiler warning */
214 switch (ufsdirhash_lookup(dp, cnp->cn_nameptr, cnp->cn_namelen,
215 &dp->i_offset, &bp, nameiop == DELETE2 ? &prevoff : NULL((void *)0))) {
216 case 0:
217 ep = (struct direct *)((char *)bp->b_data +
218 (dp->i_offset & bmask));
219 goto foundentry;
220 case ENOENT2:
221#define roundup2(x, y)(((x)+((y)-1))&(~((y)-1))) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
222 dp->i_offset = roundup2(DIP(dp, size), DIRBLKSIZ)((((((dp)->i_ump->um_fstype == 1) ? (dp)->dinode_u.ffs1_din
->di_size : (dp)->dinode_u.ffs2_din->di_size))+(((1 <<
9))-1))&(~(((1 << 9))-1)));
223 goto notfound;
224 default:
225 /* Something failed; just do a linear search. */
226 break;
227 }
228 }
229#endif /* UFS_DIRHASH */
230
231 if (nameiop != LOOKUP0 || dp->i_diroff == 0 ||
232 dp->i_diroff >= DIP(dp, size)(((dp)->i_ump->um_fstype == 1) ? (dp)->dinode_u.ffs1_din
->di_size : (dp)->dinode_u.ffs2_din->di_size)) {
233 entryoffsetinblock = 0;
234 dp->i_offset = 0;
235 numdirpasses = 1;
236 } else {
237 dp->i_offset = dp->i_diroff;
238 if ((entryoffsetinblock = dp->i_offset & bmask) &&
239 (error = UFS_BUFATOFF(dp, (off_t)dp->i_offset, NULL, &bp)((dp)->i_vtbl->iv_bufatoff)((dp), ((off_t)dp->i_offset
), (((void *)0)), (&bp))))
240 return (error);
241 numdirpasses = 2;
242 nchstats.ncs_2passes++;
243 }
244 prevoff = dp->i_offset;
245 endsearch = roundup(DIP(dp, size), DIRBLKSIZ)(((((((dp)->i_ump->um_fstype == 1) ? (dp)->dinode_u.
ffs1_din->di_size : (dp)->dinode_u.ffs2_din->di_size
))+(((1 << 9))-1))/((1 << 9)))*((1 << 9)));
246 enduseful = 0;
247
248searchloop:
249 while (dp->i_offset < endsearch) {
250 /*
251 * If necessary, get the next directory block.
252 */
253 if ((dp->i_offset & bmask) == 0) {
254 if (bp != NULL((void *)0))
255 brelse(bp);
256 error = UFS_BUFATOFF(dp, (off_t)dp->i_offset, NULL,((dp)->i_vtbl->iv_bufatoff)((dp), ((off_t)dp->i_offset
), (((void *)0)), (&bp))
257 &bp)((dp)->i_vtbl->iv_bufatoff)((dp), ((off_t)dp->i_offset
), (((void *)0)), (&bp));
258 if (error)
259 return (error);
260 entryoffsetinblock = 0;
261 }
262 /*
263 * If still looking for a slot, and at a DIRBLKSIZE
264 * boundary, have to start looking for free space again.
265 */
266 if (slotstatus == NONE &&
267 (entryoffsetinblock & (DIRBLKSIZ(1 << 9) - 1)) == 0) {
268 slotoffset = -1;
269 slotfreespace = 0;
270 }
271 /*
272 * Get pointer to next entry.
273 * Full validation checks are slow, so we only check
274 * enough to insure forward progress through the
275 * directory. Complete checks can be run by patching
276 * "dirchk" to be true.
277 */
278 ep = (struct direct *)((char *)bp->b_data + entryoffsetinblock);
279 if (ep->d_reclen == 0 ||
280 (dirchk && ufs_dirbadentry(vdp, ep, entryoffsetinblock))) {
281 int i;
282
283 ufs_dirbad(dp, dp->i_offset, "mangled entry");
284 i = DIRBLKSIZ(1 << 9) - (entryoffsetinblock & (DIRBLKSIZ(1 << 9) - 1));
285 dp->i_offset += i;
286 entryoffsetinblock += i;
287 continue;
288 }
289
290 /*
291 * If an appropriate sized slot has not yet been found,
292 * check to see if one is available. Also accumulate space
293 * in the current block so that we can determine if
294 * compaction is viable.
295 */
296 if (slotstatus != FOUND) {
297 int size = ep->d_reclen;
298
299 if (ep->d_ino != 0)
300 size -= DIRSIZ(ep)((sizeof(struct direct) - (255 +1)) + (((ep)->d_namlen+1 +
3) &~ 3));
301 if (size > 0) {
302 if (size >= slotneeded) {
303 slotstatus = FOUND;
304 slotoffset = dp->i_offset;
305 slotsize = ep->d_reclen;
306 } else if (slotstatus == NONE) {
307 slotfreespace += size;
308 if (slotoffset == -1)
309 slotoffset = dp->i_offset;
310 if (slotfreespace >= slotneeded) {
311 slotstatus = COMPACT;
312 slotsize = dp->i_offset +
313 ep->d_reclen - slotoffset;
314 }
315 }
316 }
317 }
318
319 /*
320 * Check for a name match.
321 */
322 if (ep->d_ino) {
323 namlen = ep->d_namlen;
324 if (namlen == cnp->cn_namelen &&
325 !memcmp(cnp->cn_nameptr, ep->d_name, namlen)__builtin_memcmp((cnp->cn_nameptr), (ep->d_name), (namlen
))) {
326#ifdef UFS_DIRHASH1
327foundentry:
328#endif
329 /*
330 * Save directory entry's inode number and
331 * reclen in ndp->ni_ufs area, and release
332 * directory buffer.
333 */
334 dp->i_ino = ep->d_ino;
335 dp->i_reclen = ep->d_reclen;
336 goto found;
337 }
338 }
339 prevoff = dp->i_offset;
340 dp->i_offset += ep->d_reclen;
341 entryoffsetinblock += ep->d_reclen;
342 if (ep->d_ino)
343 enduseful = dp->i_offset;
344 }
345#ifdef UFS_DIRHASH1
346notfound:
347#endif
348 /*
349 * If we started in the middle of the directory and failed
350 * to find our target, we must check the beginning as well.
351 */
352 if (numdirpasses == 2) {
353 numdirpasses--;
354 dp->i_offset = 0;
355 endsearch = dp->i_diroff;
356 goto searchloop;
357 }
358 if (bp != NULL((void *)0))
359 brelse(bp);
360 /*
361 * If creating, and at end of pathname and current
362 * directory has not been removed, then can consider
363 * allowing file to be created.
364 */
365 if ((nameiop == CREATE1 || nameiop == RENAME3) &&
366 (flags & ISLASTCN0x008000) && dp->i_effnlink != 0) {
367 /*
368 * Access for write is interpreted as allowing
369 * creation of files in the directory.
370 */
371 error = VOP_ACCESS(vdp, VWRITE00200, cred, cnp->cn_proc);
372 if (error)
373 return (error);
374 /*
375 * Return an indication of where the new directory
376 * entry should be put. If we didn't find a slot,
377 * then set dp->i_count to 0 indicating
378 * that the new slot belongs at the end of the
379 * directory. If we found a slot, then the new entry
380 * can be put in the range from dp->i_offset to
381 * dp->i_offset + dp->i_count.
382 */
383 if (slotstatus == NONE) {
384 dp->i_offset = roundup(DIP(dp, size), DIRBLKSIZ)(((((((dp)->i_ump->um_fstype == 1) ? (dp)->dinode_u.
ffs1_din->di_size : (dp)->dinode_u.ffs2_din->di_size
))+(((1 << 9))-1))/((1 << 9)))*((1 << 9)));
385 dp->i_count = 0;
386 enduseful = dp->i_offset;
387 } else if (nameiop == DELETE2) {
388 dp->i_offset = slotoffset;
389 if ((dp->i_offset & (DIRBLKSIZ(1 << 9) - 1)) == 0)
390 dp->i_count = 0;
391 else
392 dp->i_count = dp->i_offset - prevoff;
393 } else {
394 dp->i_offset = slotoffset;
395 dp->i_count = slotsize;
396 if (enduseful < slotoffset + slotsize)
397 enduseful = slotoffset + slotsize;
398 }
399 dp->i_endoff = roundup(enduseful, DIRBLKSIZ)((((enduseful)+(((1 << 9))-1))/((1 << 9)))*((1 <<
9)));
400 /*
401 * We return with the directory locked, so that
402 * the parameters we set up above will still be
403 * valid if we actually decide to do a direnter().
404 * We return ni_vp == NULL to indicate that the entry
405 * does not currently exist; we leave a pointer to
406 * the (locked) directory inode in ndp->ni_dvp.
407 * The pathname buffer is saved so that the name
408 * can be obtained later.
409 *
410 * NB - if the directory is unlocked, then this
411 * information cannot be used.
412 */
413 cnp->cn_flags |= SAVENAME0x000800;
414 if (!lockparent) {
415 VOP_UNLOCK(vdp);
416 cnp->cn_flags |= PDIRUNLOCK0x200000;
417 }
418 return (EJUSTRETURN-2);
419 }
420 /*
421 * Insert name into cache (as non-existent) if appropriate.
422 */
423 if ((cnp->cn_flags & MAKEENTRY0x004000) && nameiop != CREATE1)
424 cache_enter(vdp, *vpp, cnp);
425 return (ENOENT2);
426
427found:
428 if (numdirpasses == 2)
429 nchstats.ncs_pass2++;
430 /*
431 * Check that directory length properly reflects presence
432 * of this entry.
433 */
434 if (dp->i_offset + DIRSIZ(ep)((sizeof(struct direct) - (255 +1)) + (((ep)->d_namlen+1 +
3) &~ 3)) > DIP(dp, size)(((dp)->i_ump->um_fstype == 1) ? (dp)->dinode_u.ffs1_din
->di_size : (dp)->dinode_u.ffs2_din->di_size)) {
435 ufs_dirbad(dp, dp->i_offset, "i_ffs_size too small");
436 DIP_ASSIGN(dp, size, dp->i_offset + DIRSIZ(ep))do { if ((dp)->i_ump->um_fstype == 1) (dp)->dinode_u
.ffs1_din->di_size = (dp->i_offset + ((sizeof(struct direct
) - (255 +1)) + (((ep)->d_namlen+1 + 3) &~ 3))); else (
dp)->dinode_u.ffs2_din->di_size = (dp->i_offset + ((
sizeof(struct direct) - (255 +1)) + (((ep)->d_namlen+1 + 3
) &~ 3))); } while (0);
437 dp->i_flag |= IN_CHANGE0x0002 | IN_UPDATE0x0004;
438 }
439 brelse(bp);
440
441 /*
442 * Found component in pathname.
443 * If the final component of path name, save information
444 * in the cache as to where the entry was found.
445 */
446 if ((flags & ISLASTCN0x008000) && nameiop == LOOKUP0)
447 dp->i_diroff = dp->i_offset &~ (DIRBLKSIZ(1 << 9) - 1);
448
449 /*
450 * If deleting, and at end of pathname, return
451 * parameters which can be used to remove file.
452 * If the wantparent flag isn't set, we return only
453 * the directory (in ndp->ni_dvp), otherwise we go
454 * on and lock the inode, being careful with ".".
455 */
456 if (nameiop == DELETE2 && (flags & ISLASTCN0x008000)) {
457 /*
458 * Write access to directory required to delete files.
459 */
460 error = VOP_ACCESS(vdp, VWRITE00200, cred, cnp->cn_proc);
461 if (error)
462 return (error);
463 /*
464 * Return pointer to current entry in dp->i_offset,
465 * and distance past previous entry (if there
466 * is a previous entry in this block) in dp->i_count.
467 * Save directory inode pointer in ndp->ni_dvp for dirremove().
468 */
469 if ((dp->i_offset & (DIRBLKSIZ(1 << 9) - 1)) == 0)
470 dp->i_count = 0;
471 else
472 dp->i_count = dp->i_offset - prevoff;
473 if (dp->i_number == dp->i_ino) {
474 vref(vdp);
475 *vpp = vdp;
476 return (0);
477 }
478 error = VFS_VGET(vdp->v_mount, dp->i_ino, &tdp)(*(vdp->v_mount)->mnt_op->vfs_vget)(vdp->v_mount,
dp->i_ino, &tdp);
479 if (error)
480 return (error);
481 /*
482 * If directory is "sticky", then user must own
483 * the directory, or the file in it, else she
484 * may not delete it (unless she's root). This
485 * implements append-only directories.
486 */
487 if ((DIP(dp, mode)(((dp)->i_ump->um_fstype == 1) ? (dp)->dinode_u.ffs1_din
->di_mode : (dp)->dinode_u.ffs2_din->di_mode) & ISVTX0001000) &&
488 cred->cr_uid != 0 &&
489 cred->cr_uid != DIP(dp, uid)(((dp)->i_ump->um_fstype == 1) ? (dp)->dinode_u.ffs1_din
->di_uid : (dp)->dinode_u.ffs2_din->di_uid) &&
490 !vnoperm(vdp) &&
491 DIP(VTOI(tdp), uid)(((((struct inode *)(tdp)->v_data))->i_ump->um_fstype
== 1) ? (((struct inode *)(tdp)->v_data))->dinode_u.ffs1_din
->di_uid : (((struct inode *)(tdp)->v_data))->dinode_u
.ffs2_din->di_uid) != cred->cr_uid) {
492 vput(tdp);
493 return (EPERM1);
494 }
495 *vpp = tdp;
496 if (!lockparent) {
497 VOP_UNLOCK(vdp);
498 cnp->cn_flags |= PDIRUNLOCK0x200000;
499 }
500 return (0);
501 }
502
503 /*
504 * If rewriting (RENAME), return the inode and the
505 * information required to rewrite the present directory
506 * Must get inode of directory entry to verify it's a
507 * regular file, or empty directory.
508 */
509 if (nameiop == RENAME3 && wantparent &&
510 (flags & ISLASTCN0x008000)) {
511 error = VOP_ACCESS(vdp, VWRITE00200, cred, cnp->cn_proc);
512 if (error)
513 return (error);
514 /*
515 * Careful about locking second inode.
516 * This can only occur if the target is ".".
517 */
518 if (dp->i_number == dp->i_ino)
519 return (EISDIR21);
520 error = VFS_VGET(vdp->v_mount, dp->i_ino, &tdp)(*(vdp->v_mount)->mnt_op->vfs_vget)(vdp->v_mount,
dp->i_ino, &tdp);
521 if (error)
522 return (error);
523 *vpp = tdp;
524 cnp->cn_flags |= SAVENAME0x000800;
525 if (!lockparent) {
526 VOP_UNLOCK(vdp);
527 cnp->cn_flags |= PDIRUNLOCK0x200000;
528 }
529 return (0);
530 }
531
532 /*
533 * Step through the translation in the name. We do not `vput' the
534 * directory because we may need it again if a symbolic link
535 * is relative to the current directory. Instead we save it
536 * unlocked as "pdp". We must get the target inode before unlocking
537 * the directory to insure that the inode will not be removed
538 * before we get it. We prevent deadlock by always fetching
539 * inodes from the root, moving down the directory tree. Thus
540 * when following backward pointers ".." we must unlock the
541 * parent directory before getting the requested directory.
542 * There is a potential race condition here if both the current
543 * and parent directories are removed before the VFS_VGET for the
544 * inode associated with ".." returns. We hope that this occurs
545 * infrequently since we cannot avoid this race condition without
546 * implementing a sophisticated deadlock detection algorithm.
547 * Note also that this simple deadlock detection scheme will not
548 * work if the file system has any hard links other than ".."
549 * that point backwards in the directory structure.
550 */
551 pdp = vdp;
552 if (flags & ISDOTDOT0x002000) {
553 VOP_UNLOCK(pdp); /* race to get the inode */
554 cnp->cn_flags |= PDIRUNLOCK0x200000;
555 error = VFS_VGET(vdp->v_mount, dp->i_ino, &tdp)(*(vdp->v_mount)->mnt_op->vfs_vget)(vdp->v_mount,
dp->i_ino, &tdp);
556 if (error) {
557 if (vn_lock(pdp, LK_EXCLUSIVE0x0001UL | LK_RETRY0x2000UL) == 0)
558 cnp->cn_flags &= ~PDIRUNLOCK0x200000;
559 return (error);
560 }
561 if (lockparent && (flags & ISLASTCN0x008000)) {
562 if ((error = vn_lock(pdp, LK_EXCLUSIVE0x0001UL))) {
563 vput(tdp);
564 return (error);
565 }
566 cnp->cn_flags &= ~PDIRUNLOCK0x200000;
567 }
568 *vpp = tdp;
569 } else if (dp->i_number == dp->i_ino) {
570 vref(vdp); /* we want ourself, ie "." */
571 *vpp = vdp;
572 } else {
573 error = VFS_VGET(vdp->v_mount, dp->i_ino, &tdp)(*(vdp->v_mount)->mnt_op->vfs_vget)(vdp->v_mount,
dp->i_ino, &tdp);
574 if (error)
575 return (error);
576 if (!lockparent || !(flags & ISLASTCN0x008000)) {
577 VOP_UNLOCK(pdp);
578 cnp->cn_flags |= PDIRUNLOCK0x200000;
579 }
580 *vpp = tdp;
581 }
582
583 /*
584 * Insert name into cache if appropriate.
585 */
586 if (cnp->cn_flags & MAKEENTRY0x004000)
587 cache_enter(vdp, *vpp, cnp);
588 return (0);
589}
590
591void
592ufs_dirbad(struct inode *ip, doff_tint32_t offset, char *how)
593{
594 struct mount *mp;
595
596 mp = ITOV(ip)((ip)->i_vnode)->v_mount;
597 (void)printf("%s: bad dir ino %u at offset %d: %s\n",
598 mp->mnt_stat.f_mntonname, ip->i_number, offset, how);
599 if ((mp->mnt_stat.f_flags & MNT_RDONLY0x00000001) == 0)
600 panic("bad dir");
601}
602
603/*
604 * Do consistency checking on a directory entry:
605 * record length must be multiple of 4
606 * entry must fit in rest of its DIRBLKSIZ block
607 * record must be large enough to contain entry
608 * name is not longer than MAXNAMLEN
609 * name must be as long as advertised, and null terminated
610 */
611int
612ufs_dirbadentry(struct vnode *vdp, struct direct *ep, int entryoffsetinblock)
613{
614 struct inode *dp;
615 int i;
616 int namlen;
617
618 dp = VTOI(vdp)((struct inode *)(vdp)->v_data);
Value stored to 'dp' is never read
619
620 namlen = ep->d_namlen;
621 if ((ep->d_reclen & 0x3) != 0 ||
622 ep->d_reclen > DIRBLKSIZ(1 << 9) - (entryoffsetinblock & (DIRBLKSIZ(1 << 9) - 1)) ||
623 ep->d_reclen < DIRSIZ(ep)((sizeof(struct direct) - (255 +1)) + (((ep)->d_namlen+1 +
3) &~ 3)) || namlen > MAXNAMLEN255) {
624 /*return (1); */
625 printf("First bad\n");
626 goto bad;
627 }
628 if (ep->d_ino == 0)
629 return (0);
630 for (i = 0; i < namlen; i++)
631 if (ep->d_name[i] == '\0') {
632 /*return (1); */
633 printf("Second bad\n");
634 goto bad;
635 }
636 if (ep->d_name[i])
637 goto bad;
638 return (0);
639bad:
640 return (1);
641}
642
643/*
644 * Construct a new directory entry after a call to namei, using the
645 * parameters that it left in the componentname argument cnp. The
646 * argument ip is the inode to which the new directory entry will refer.
647 */
648void
649ufs_makedirentry(struct inode *ip, struct componentname *cnp,
650 struct direct *newdirp)
651{
652#ifdef DIAGNOSTIC1
653 if ((cnp->cn_flags & SAVENAME0x000800) == 0)
654 panic("ufs_makedirentry: missing name");
655#endif
656 newdirp->d_ino = ip->i_number;
657 newdirp->d_namlen = cnp->cn_namelen;
658 memset(newdirp->d_name + (cnp->cn_namelen & ~(DIR_ROUNDUP-1)),__builtin_memset((newdirp->d_name + (cnp->cn_namelen &
~(4 -1))), (0), (4))
659 0, DIR_ROUNDUP)__builtin_memset((newdirp->d_name + (cnp->cn_namelen &
~(4 -1))), (0), (4));
660 memcpy(newdirp->d_name, cnp->cn_nameptr, cnp->cn_namelen)__builtin_memcpy((newdirp->d_name), (cnp->cn_nameptr), (
cnp->cn_namelen));
661 newdirp->d_type = IFTODT(DIP(ip, mode))((((((ip)->i_ump->um_fstype == 1) ? (ip)->dinode_u.ffs1_din
->di_mode : (ip)->dinode_u.ffs2_din->di_mode)) &
0170000) >> 12);
662}
663
664/*
665 * Write a directory entry after a call to namei, using the parameters
666 * that it left in nameidata. The argument dirp is the new directory
667 * entry contents. Dvp is a pointer to the directory to be written,
668 * which was left locked by namei. Remaining parameters (dp->i_offset,
669 * dp->i_count) indicate how the space for the new entry is to be obtained.
670 * Non-null bp indicates that a directory is being created (for the
671 * soft dependency code).
672 */
673int
674ufs_direnter(struct vnode *dvp, struct vnode *tvp, struct direct *dirp,
675 struct componentname *cnp, struct buf *newdirbp)
676{
677 struct ucred *cr;
678 struct proc *p;
679 int newentrysize;
680 struct inode *dp;
681 struct buf *bp;
682 u_int dsize;
683 struct direct *ep, *nep;
684 int error, ret, blkoff, loc, spacefree, flags;
685 char *dirbuf;
686
687 error = 0;
688 cr = cnp->cn_cred;
689 p = cnp->cn_proc;
690 dp = VTOI(dvp)((struct inode *)(dvp)->v_data);
691 newentrysize = DIRSIZ(dirp)((sizeof(struct direct) - (255 +1)) + (((dirp)->d_namlen+1
+ 3) &~ 3));
692
693 if (dp->i_count == 0) {
694 /*
695 * If dp->i_count is 0, then namei could find no
696 * space in the directory. Here, dp->i_offset will
697 * be on a directory block boundary and we will write the
698 * new entry into a fresh block.
699 */
700 if (dp->i_offset & (DIRBLKSIZ(1 << 9) - 1))
701 panic("ufs_direnter: newblk");
702 flags = B_CLRBUF0x01;
703 if (!DOINGSOFTDEP(dvp)((dvp)->v_mount->mnt_flag & 0x04000000))
704 flags |= B_SYNC0x02;
705 if ((error = UFS_BUF_ALLOC(dp, (off_t)dp->i_offset, DIRBLKSIZ,((dp)->i_vtbl->iv_buf_alloc)((dp), ((off_t)dp->i_offset
), ((1 << 9)), (cr), (flags), (&bp))
706 cr, flags, &bp)((dp)->i_vtbl->iv_buf_alloc)((dp), ((off_t)dp->i_offset
), ((1 << 9)), (cr), (flags), (&bp))) != 0) {
707 if (DOINGSOFTDEP(dvp)((dvp)->v_mount->mnt_flag & 0x04000000) && newdirbp != NULL((void *)0))
708 bdwrite(newdirbp);
709 return (error);
710 }
711 DIP_ASSIGN(dp, size, dp->i_offset + DIRBLKSIZ)do { if ((dp)->i_ump->um_fstype == 1) (dp)->dinode_u
.ffs1_din->di_size = (dp->i_offset + (1 << 9)); else
(dp)->dinode_u.ffs2_din->di_size = (dp->i_offset + (
1 << 9)); } while (0);
712 dp->i_flag |= IN_CHANGE0x0002 | IN_UPDATE0x0004;
713 uvm_vnp_setsize(dvp, DIP(dp, size)(((dp)->i_ump->um_fstype == 1) ? (dp)->dinode_u.ffs1_din
->di_size : (dp)->dinode_u.ffs2_din->di_size));
714 dirp->d_reclen = DIRBLKSIZ(1 << 9);
715 blkoff = dp->i_offset &
716 (VFSTOUFS(dvp->v_mount)((struct ufsmount *)((dvp->v_mount)->mnt_data))->um_mountp->mnt_stat.f_iosize - 1);
717 memcpy(bp->b_data + blkoff, dirp, newentrysize)__builtin_memcpy((bp->b_data + blkoff), (dirp), (newentrysize
));
718
719#ifdef UFS_DIRHASH1
720 if (dp->i_dirhashinode_ext.dirhash != NULL((void *)0)) {
721 ufsdirhash_newblk(dp, dp->i_offset);
722 ufsdirhash_add(dp, dirp, dp->i_offset);
723 ufsdirhash_checkblock(dp, (char *)bp->b_data + blkoff,
724 dp->i_offset);
725 }
726#endif
727
728 if (DOINGSOFTDEP(dvp)((dvp)->v_mount->mnt_flag & 0x04000000)) {
729 /*
730 * Ensure that the entire newly allocated block is a
731 * valid directory so that future growth within the
732 * block does not have to ensure that the block is
733 * written before the inode.
734 */
735 blkoff += DIRBLKSIZ(1 << 9);
736 while (blkoff < bp->b_bcount) {
737 ((struct direct *)
738 (bp->b_data + blkoff))->d_reclen = DIRBLKSIZ(1 << 9);
739 blkoff += DIRBLKSIZ(1 << 9);
740 }
741 if (softdep_setup_directory_add(bp, dp, dp->i_offset,
742 dirp->d_ino, newdirbp, 1) == 0) {
743 bdwrite(bp);
744 return (UFS_UPDATE(dp, 0)((dp)->i_vtbl->iv_update)((dp), (0)));
745 }
746 /* We have just allocated a directory block in an
747 * indirect block. Rather than tracking when it gets
748 * claimed by the inode, we simply do a VOP_FSYNC
749 * now to ensure that it is there (in case the user
750 * does a future fsync). Note that we have to unlock
751 * the inode for the entry that we just entered, as
752 * the VOP_FSYNC may need to lock other inodes which
753 * can lead to deadlock if we also hold a lock on
754 * the newly entered node.
755 */
756 if ((error = VOP_BWRITE(bp)))
757 return (error);
758 if (tvp != NULL((void *)0))
759 VOP_UNLOCK(tvp);
760 error = VOP_FSYNC(dvp, p->p_ucred, MNT_WAIT1, p);
761 if (tvp != NULL((void *)0))
762 vn_lock(tvp, LK_EXCLUSIVE0x0001UL | LK_RETRY0x2000UL);
763 return (error);
764 }
765 error = VOP_BWRITE(bp);
766 ret = UFS_UPDATE(dp, !DOINGSOFTDEP(dvp))((dp)->i_vtbl->iv_update)((dp), (!((dvp)->v_mount->
mnt_flag & 0x04000000)));
767 if (error == 0)
768 return (ret);
769 return (error);
770 }
771
772 /*
773 * If dp->i_count is non-zero, then namei found space for the new
774 * entry in the range dp->i_offset to dp->i_offset + dp->i_count
775 * in the directory. To use this space, we may have to compact
776 * the entries located there, by copying them together towards the
777 * beginning of the block, leaving the free space in one usable
778 * chunk at the end.
779 */
780
781 /*
782 * Increase size of directory if entry eats into new space.
783 * This should never push the size past a new multiple of
784 * DIRBLKSIZE.
785 *
786 * N.B. - THIS IS AN ARTIFACT OF 4.2 AND SHOULD NEVER HAPPEN.
787 */
788 if (dp->i_offset + dp->i_count > DIP(dp, size)(((dp)->i_ump->um_fstype == 1) ? (dp)->dinode_u.ffs1_din
->di_size : (dp)->dinode_u.ffs2_din->di_size))
789 DIP_ASSIGN(dp, size, dp->i_offset + dp->i_count)do { if ((dp)->i_ump->um_fstype == 1) (dp)->dinode_u
.ffs1_din->di_size = (dp->i_offset + dp->i_count); else
(dp)->dinode_u.ffs2_din->di_size = (dp->i_offset + dp
->i_count); } while (0);
790 /*
791 * Get the block containing the space for the new directory entry.
792 */
793 if ((error = UFS_BUFATOFF(dp, (off_t)dp->i_offset, &dirbuf, &bp)((dp)->i_vtbl->iv_bufatoff)((dp), ((off_t)dp->i_offset
), (&dirbuf), (&bp)))
794 != 0) {
795 if (DOINGSOFTDEP(dvp)((dvp)->v_mount->mnt_flag & 0x04000000) && newdirbp != NULL((void *)0))
796 bdwrite(newdirbp);
797 return (error);
798 }
799 /*
800 * Find space for the new entry. In the simple case, the entry at
801 * offset base will have the space. If it does not, then namei
802 * arranged that compacting the region dp->i_offset to
803 * dp->i_offset + dp->i_count would yield the space.
804 */
805 ep = (struct direct *)dirbuf;
806 dsize = ep->d_ino ? DIRSIZ(ep)((sizeof(struct direct) - (255 +1)) + (((ep)->d_namlen+1 +
3) &~ 3)) : 0;
807 spacefree = ep->d_reclen - dsize;
808 for (loc = ep->d_reclen; loc < dp->i_count; ) {
809 nep = (struct direct *)(dirbuf + loc);
810
811 /* Trim the existing slot (NB: dsize may be zero). */
812 ep->d_reclen = dsize;
813 ep = (struct direct *)((char *)ep + dsize);
814
815 /* Read nep->d_reclen now as the memmove() may clobber it. */
816 loc += nep->d_reclen;
817 if (nep->d_ino == 0) {
818 /*
819 * A mid-block unused entry. Such entries are
820 * never created by the kernel, but fsck_ffs
821 * can create them (and it doesn't fix them).
822 *
823 * Add up the free space, and initialise the
824 * relocated entry since we don't memmove it.
825 */
826 spacefree += nep->d_reclen;
827 ep->d_ino = 0;
828 dsize = 0;
829 continue;
830 }
831 dsize = DIRSIZ(nep)((sizeof(struct direct) - (255 +1)) + (((nep)->d_namlen+1 +
3) &~ 3));
832 spacefree += nep->d_reclen - dsize;
833#ifdef UFS_DIRHASH1
834 if (dp->i_dirhashinode_ext.dirhash != NULL((void *)0))
835 ufsdirhash_move(dp, nep,
836 dp->i_offset + ((char *)nep - dirbuf),
837 dp->i_offset + ((char *)ep - dirbuf));
838#endif
839 if (DOINGSOFTDEP(dvp)((dvp)->v_mount->mnt_flag & 0x04000000))
840 softdep_change_directoryentry_offset(dp, dirbuf,
841 (caddr_t)nep, (caddr_t)ep, dsize);
842 else
843 memmove(ep, nep, dsize)__builtin_memmove((ep), (nep), (dsize));
844 }
845 /*
846 * Here, `ep' points to a directory entry containing `dsize' in-use
847 * bytes followed by `spacefree' unused bytes. If ep->d_ino == 0,
848 * then the entry is completely unused (dsize == 0). The value
849 * of ep->d_reclen is always indeterminate.
850 *
851 * Update the pointer fields in the previous entry (if any),
852 * copy in the new entry, and write out the block.
853 */
854 if (ep->d_ino == 0) {
855 if (spacefree + dsize < newentrysize)
856 panic("ufs_direnter: compact1");
857 dirp->d_reclen = spacefree + dsize;
858 } else {
859 if (spacefree < newentrysize)
860 panic("ufs_direnter: compact2");
861 dirp->d_reclen = spacefree;
862 ep->d_reclen = dsize;
863 ep = (struct direct *)((char *)ep + dsize);
864 }
865
866#ifdef UFS_DIRHASH1
867 if (dp->i_dirhashinode_ext.dirhash != NULL((void *)0) && (ep->d_ino == 0 ||
868 dirp->d_reclen == spacefree))
869 ufsdirhash_add(dp, dirp, dp->i_offset + ((char *)ep - dirbuf));
870#endif
871 memcpy(ep, dirp, newentrysize)__builtin_memcpy((ep), (dirp), (newentrysize));
872#ifdef UFS_DIRHASH1
873 if (dp->i_dirhashinode_ext.dirhash != NULL((void *)0))
874 ufsdirhash_checkblock(dp, dirbuf -
875 (dp->i_offset & (DIRBLKSIZ(1 << 9) - 1)),
876 dp->i_offset & ~(DIRBLKSIZ(1 << 9) - 1));
877#endif
878
879 if (DOINGSOFTDEP(dvp)((dvp)->v_mount->mnt_flag & 0x04000000)) {
880 (void)softdep_setup_directory_add(bp, dp,
881 dp->i_offset + (caddr_t)ep - dirbuf,
882 dirp->d_ino, newdirbp, 0);
883 bdwrite(bp);
884 } else {
885 error = VOP_BWRITE(bp);
886 }
887 dp->i_flag |= IN_CHANGE0x0002 | IN_UPDATE0x0004;
888
889 /*
890 * If all went well, and the directory can be shortened, proceed
891 * with the truncation. Note that we have to unlock the inode for
892 * the entry that we just entered, as the truncation may need to
893 * lock other inodes which can lead to deadlock if we also hold a
894 * lock on the newly entered node.
895 */
896
897 if (error == 0 && dp->i_endoff && dp->i_endoff < DIP(dp, size)(((dp)->i_ump->um_fstype == 1) ? (dp)->dinode_u.ffs1_din
->di_size : (dp)->dinode_u.ffs2_din->di_size)) {
898 if (tvp != NULL((void *)0))
899 VOP_UNLOCK(tvp);
900 error = UFS_TRUNCATE(dp, (off_t)dp->i_endoff, IO_SYNC, cr)((dp)->i_vtbl->iv_truncate)((dp), ((off_t)dp->i_endoff
), (0x04), (cr));
901#ifdef UFS_DIRHASH1
902 if (error == 0 && dp->i_dirhashinode_ext.dirhash != NULL((void *)0))
903 ufsdirhash_dirtrunc(dp, dp->i_endoff);
904#endif
905 if (tvp != NULL((void *)0))
906 vn_lock(tvp, LK_EXCLUSIVE0x0001UL | LK_RETRY0x2000UL);
907 }
908 return (error);
909}
910
911/*
912 * Remove a directory entry after a call to namei, using
913 * the parameters which it left in nameidata. The entry
914 * dp->i_offset contains the offset into the directory of the
915 * entry to be eliminated. The dp->i_count field contains the
916 * size of the previous record in the directory. If this
917 * is 0, the first entry is being deleted, so we need only
918 * zero the inode number to mark the entry as free. If the
919 * entry is not the first in the directory, we must reclaim
920 * the space of the now empty record by adding the record size
921 * to the size of the previous entry.
922 */
923int
924ufs_dirremove(struct vnode *dvp, struct inode *ip, int flags, int isrmdir)
925{
926 struct inode *dp;
927 struct direct *ep;
928 struct buf *bp;
929 int error;
930
931 dp = VTOI(dvp)((struct inode *)(dvp)->v_data);
932
933 if ((error = UFS_BUFATOFF(dp,((dp)->i_vtbl->iv_bufatoff)((dp), ((off_t)(dp->i_offset
- dp->i_count)), ((char **)&ep), (&bp))
934 (off_t)(dp->i_offset - dp->i_count), (char **)&ep, &bp)((dp)->i_vtbl->iv_bufatoff)((dp), ((off_t)(dp->i_offset
- dp->i_count)), ((char **)&ep), (&bp))) != 0)
935 return (error);
936#ifdef UFS_DIRHASH1
937 /*
938 * Remove the dirhash entry. This is complicated by the fact
939 * that `ep' is the previous entry when dp->i_count != 0.
940 */
941 if (dp->i_dirhashinode_ext.dirhash != NULL((void *)0))
942 ufsdirhash_remove(dp, (dp->i_count == 0) ? ep :
943 (struct direct *)((char *)ep + ep->d_reclen), dp->i_offset);
944#endif
945
946 if (dp->i_count == 0) {
947 /*
948 * First entry in block: set d_ino to zero.
949 */
950 ep->d_ino = 0;
951 } else {
952 /*
953 * Collapse new free space into previous entry.
954 */
955 ep->d_reclen += dp->i_reclen;
956 }
957#ifdef UFS_DIRHASH1
958 if (dp->i_dirhashinode_ext.dirhash != NULL((void *)0))
959 ufsdirhash_checkblock(dp, (char *)ep -
960 ((dp->i_offset - dp->i_count) & (DIRBLKSIZ(1 << 9) - 1)),
961 dp->i_offset & ~(DIRBLKSIZ(1 << 9) - 1));
962#endif
963 if (DOINGSOFTDEP(dvp)((dvp)->v_mount->mnt_flag & 0x04000000)) {
964 if (ip) {
965 ip->i_effnlink--;
966 softdep_change_linkcnt(ip, 0);
967 softdep_setup_remove(bp, dp, ip, isrmdir);
968 }
969 if (softdep_slowdown(dvp)) {
970 error = bwrite(bp);
971 } else {
972 bdwrite(bp);
973 error = 0;
974 }
975 } else {
976 if (ip) {
977 ip->i_effnlink--;
978 DIP_ADD(ip, nlink, -1)do { if ((ip)->i_ump->um_fstype == 1) (ip)->dinode_u
.ffs1_din->di_nlink += (-1); else (ip)->dinode_u.ffs2_din
->di_nlink += (-1); } while (0);
979 ip->i_flag |= IN_CHANGE0x0002;
980 }
981 if (DOINGASYNC(dvp)((dvp)->v_mount->mnt_flag & 0x00000040) && dp->i_count != 0) {
982 bdwrite(bp);
983 error = 0;
984 } else
985 error = bwrite(bp);
986 }
987 dp->i_flag |= IN_CHANGE0x0002 | IN_UPDATE0x0004;
988 return (error);
989}
990
991/*
992 * Rewrite an existing directory entry to point at the inode
993 * supplied. The parameters describing the directory entry are
994 * set up by a call to namei.
995 */
996int
997ufs_dirrewrite(struct inode *dp, struct inode *oip, ufsino_t newinum,
998 int newtype, int isrmdir)
999{
1000 struct buf *bp;
1001 struct direct *ep;
1002 struct vnode *vdp = ITOV(dp)((dp)->i_vnode);
1003 int error;
1004
1005 error = UFS_BUFATOFF(dp, (off_t)dp->i_offset, (char **)&ep, &bp)((dp)->i_vtbl->iv_bufatoff)((dp), ((off_t)dp->i_offset
), ((char **)&ep), (&bp));
1006 if (error)
1007 return (error);
1008 ep->d_ino = newinum;
1009 ep->d_type = newtype;
1010 oip->i_effnlink--;
1011 if (DOINGSOFTDEP(vdp)((vdp)->v_mount->mnt_flag & 0x04000000)) {
1012 softdep_change_linkcnt(oip, 0);
1013 softdep_setup_directory_change(bp, dp, oip, newinum, isrmdir);
1014 bdwrite(bp);
1015 } else {
1016 DIP_ADD(oip, nlink, -1)do { if ((oip)->i_ump->um_fstype == 1) (oip)->dinode_u
.ffs1_din->di_nlink += (-1); else (oip)->dinode_u.ffs2_din
->di_nlink += (-1); } while (0);
1017 oip->i_flag |= IN_CHANGE0x0002;
1018 if (DOINGASYNC(vdp)((vdp)->v_mount->mnt_flag & 0x00000040)) {
1019 bdwrite(bp);
1020 error = 0;
1021 } else {
1022 error = VOP_BWRITE(bp);
1023 }
1024 }
1025 dp->i_flag |= IN_CHANGE0x0002 | IN_UPDATE0x0004;
1026 return (error);
1027}
1028
1029/*
1030 * Check if a directory is empty or not.
1031 * Inode supplied must be locked.
1032 *
1033 * Using a struct dirtemplate here is not precisely
1034 * what we want, but better than using a struct direct.
1035 *
1036 * NB: does not handle corrupted directories.
1037 */
1038int
1039ufs_dirempty(struct inode *ip, ufsino_t parentino, struct ucred *cred)
1040{
1041 off_t off, m;
1042 struct dirtemplate dbuf;
1043 struct direct *dp = (struct direct *)&dbuf;
1044 int error, namlen;
1045 size_t count;
1046#define MINDIRSIZ(sizeof (struct dirtemplate) / 2) (sizeof (struct dirtemplate) / 2)
1047
1048 m = DIP(ip, size)(((ip)->i_ump->um_fstype == 1) ? (ip)->dinode_u.ffs1_din
->di_size : (ip)->dinode_u.ffs2_din->di_size);
1049 for (off = 0; off < m; off += dp->d_reclen) {
1050 error = vn_rdwr(UIO_READ, ITOV(ip)((ip)->i_vnode), (caddr_t)dp, MINDIRSIZ(sizeof (struct dirtemplate) / 2), off,
1051 UIO_SYSSPACE, IO_NODELOCKED0x08, cred, &count, curproc({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r"
(__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self)));
__ci;})->ci_curproc);
1052 /*
1053 * Since we read MINDIRSIZ, residual must
1054 * be 0 unless we're at end of file.
1055 */
1056 if (error || count != 0)
1057 return (0);
1058 /* avoid infinite loops */
1059 if (dp->d_reclen == 0)
1060 return (0);
1061 /* skip empty entries */
1062 if (dp->d_ino == 0)
1063 continue;
1064 /* accept only "." and ".." */
1065 namlen = dp->d_namlen;
1066 if (namlen > 2)
1067 return (0);
1068 if (dp->d_name[0] != '.')
1069 return (0);
1070 /*
1071 * At this point namlen must be 1 or 2.
1072 * 1 implies ".", 2 implies ".." if second
1073 * char is also "."
1074 */
1075 if (namlen == 1 && dp->d_ino == ip->i_number)
1076 continue;
1077 if (dp->d_name[1] == '.' && dp->d_ino == parentino)
1078 continue;
1079 return (0);
1080 }
1081 return (1);
1082}
1083
1084/*
1085 * Check if source directory is in the path of the target directory.
1086 * Target is supplied locked, source is unlocked.
1087 * The target is always vput before returning.
1088 */
1089int
1090ufs_checkpath(struct inode *source, struct inode *target, struct ucred *cred)
1091{
1092 struct vnode *nextvp, *vp;
1093 int error, rootino, namlen;
1094 struct dirtemplate dirbuf;
1095
1096 vp = ITOV(target)((target)->i_vnode);
1097 if (target->i_number == source->i_number) {
1098 error = EEXIST17;
1099 goto out;
1100 }
1101 rootino = ROOTINO((ufsino_t)2);
1102 error = 0;
1103 if (target->i_number == rootino)
1104 goto out;
1105
1106 for (;;) {
1107 if (vp->v_type != VDIR) {
1108 error = ENOTDIR20;
1109 break;
1110 }
1111 error = vn_rdwr(UIO_READ, vp, (caddr_t)&dirbuf,
1112 sizeof (struct dirtemplate), (off_t)0, UIO_SYSSPACE,
1113 IO_NODELOCKED0x08, cred, NULL((void *)0), curproc({struct cpu_info *__ci; asm volatile("movq %%gs:%P1,%0" : "=r"
(__ci) :"n" (__builtin_offsetof(struct cpu_info, ci_self)));
__ci;})->ci_curproc);
1114 if (error != 0)
1115 break;
1116 namlen = dirbuf.dotdot_namlen;
1117 if (namlen != 2 ||
1118 dirbuf.dotdot_name[0] != '.' ||
1119 dirbuf.dotdot_name[1] != '.') {
1120 error = ENOTDIR20;
1121 break;
1122 }
1123 if (dirbuf.dotdot_ino == source->i_number) {
1124 error = EINVAL22;
1125 break;
1126 }
1127 if (dirbuf.dotdot_ino == rootino)
1128 break;
1129 VOP_UNLOCK(vp);
1130 error = VFS_VGET(vp->v_mount, dirbuf.dotdot_ino, &nextvp)(*(vp->v_mount)->mnt_op->vfs_vget)(vp->v_mount, dirbuf
.dotdot_ino, &nextvp);
1131 vrele(vp);
1132 if (error) {
1133 vp = NULL((void *)0);
1134 break;
1135 }
1136 vp = nextvp;
1137 }
1138
1139out:
1140 if (error == ENOTDIR20)
1141 printf("checkpath: .. not a directory\n");
1142 if (vp != NULL((void *)0))
1143 vput(vp);
1144 return (error);
1145}