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Commit | Line | Data |
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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
f2741d98 | 3 | * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
4 | * |
5 | * This copyrighted material is made available to anyone wishing to use, | |
6 | * modify, copy, or redistribute it subject to the terms and conditions | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
8 | */ |
9 | ||
b3b94faa DT |
10 | #include <linux/slab.h> |
11 | #include <linux/spinlock.h> | |
12 | #include <linux/completion.h> | |
13 | #include <linux/buffer_head.h> | |
14 | #include <linux/namei.h> | |
b3b94faa DT |
15 | #include <linux/mm.h> |
16 | #include <linux/xattr.h> | |
17 | #include <linux/posix_acl.h> | |
5c676f6d | 18 | #include <linux/gfs2_ondisk.h> |
71b86f56 | 19 | #include <linux/crc32.h> |
e9079cce | 20 | #include <linux/fiemap.h> |
194c011f | 21 | #include <linux/security.h> |
b3b94faa DT |
22 | #include <asm/uaccess.h> |
23 | ||
24 | #include "gfs2.h" | |
5c676f6d | 25 | #include "incore.h" |
b3b94faa DT |
26 | #include "acl.h" |
27 | #include "bmap.h" | |
28 | #include "dir.h" | |
307cf6e6 | 29 | #include "xattr.h" |
b3b94faa DT |
30 | #include "glock.h" |
31 | #include "inode.h" | |
32 | #include "meta_io.h" | |
b3b94faa DT |
33 | #include "quota.h" |
34 | #include "rgrp.h" | |
35 | #include "trans.h" | |
5c676f6d | 36 | #include "util.h" |
b2760583 | 37 | #include "super.h" |
194c011f SW |
38 | #include "glops.h" |
39 | ||
40 | struct gfs2_skip_data { | |
41 | u64 no_addr; | |
42 | int skipped; | |
43 | int non_block; | |
44 | }; | |
45 | ||
46 | static int iget_test(struct inode *inode, void *opaque) | |
47 | { | |
48 | struct gfs2_inode *ip = GFS2_I(inode); | |
49 | struct gfs2_skip_data *data = opaque; | |
50 | ||
51 | if (ip->i_no_addr == data->no_addr) { | |
52 | if (data->non_block && | |
53 | inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) { | |
54 | data->skipped = 1; | |
55 | return 0; | |
56 | } | |
57 | return 1; | |
58 | } | |
59 | return 0; | |
60 | } | |
61 | ||
62 | static int iget_set(struct inode *inode, void *opaque) | |
63 | { | |
64 | struct gfs2_inode *ip = GFS2_I(inode); | |
65 | struct gfs2_skip_data *data = opaque; | |
66 | ||
67 | if (data->skipped) | |
68 | return -ENOENT; | |
69 | inode->i_ino = (unsigned long)(data->no_addr); | |
70 | ip->i_no_addr = data->no_addr; | |
71 | return 0; | |
72 | } | |
73 | ||
74 | struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block) | |
75 | { | |
76 | unsigned long hash = (unsigned long)no_addr; | |
77 | struct gfs2_skip_data data; | |
78 | ||
79 | data.no_addr = no_addr; | |
80 | data.skipped = 0; | |
81 | data.non_block = non_block; | |
82 | return ilookup5(sb, hash, iget_test, &data); | |
83 | } | |
84 | ||
85 | static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr, | |
86 | int non_block) | |
87 | { | |
88 | struct gfs2_skip_data data; | |
89 | unsigned long hash = (unsigned long)no_addr; | |
90 | ||
91 | data.no_addr = no_addr; | |
92 | data.skipped = 0; | |
93 | data.non_block = non_block; | |
94 | return iget5_locked(sb, hash, iget_test, iget_set, &data); | |
95 | } | |
96 | ||
97 | /** | |
98 | * gfs2_set_iop - Sets inode operations | |
99 | * @inode: The inode with correct i_mode filled in | |
100 | * | |
101 | * GFS2 lookup code fills in vfs inode contents based on info obtained | |
102 | * from directory entry inside gfs2_inode_lookup(). | |
103 | */ | |
104 | ||
105 | static void gfs2_set_iop(struct inode *inode) | |
106 | { | |
107 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
108 | umode_t mode = inode->i_mode; | |
109 | ||
110 | if (S_ISREG(mode)) { | |
111 | inode->i_op = &gfs2_file_iops; | |
112 | if (gfs2_localflocks(sdp)) | |
113 | inode->i_fop = &gfs2_file_fops_nolock; | |
114 | else | |
115 | inode->i_fop = &gfs2_file_fops; | |
116 | } else if (S_ISDIR(mode)) { | |
117 | inode->i_op = &gfs2_dir_iops; | |
118 | if (gfs2_localflocks(sdp)) | |
119 | inode->i_fop = &gfs2_dir_fops_nolock; | |
120 | else | |
121 | inode->i_fop = &gfs2_dir_fops; | |
122 | } else if (S_ISLNK(mode)) { | |
123 | inode->i_op = &gfs2_symlink_iops; | |
124 | } else { | |
125 | inode->i_op = &gfs2_file_iops; | |
126 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
127 | } | |
128 | } | |
129 | ||
130 | /** | |
131 | * gfs2_inode_lookup - Lookup an inode | |
132 | * @sb: The super block | |
133 | * @no_addr: The inode number | |
134 | * @type: The type of the inode | |
135 | * non_block: Can we block on inodes that are being freed? | |
136 | * | |
137 | * Returns: A VFS inode, or an error | |
138 | */ | |
139 | ||
140 | struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, | |
141 | u64 no_addr, u64 no_formal_ino, int non_block) | |
142 | { | |
143 | struct inode *inode; | |
144 | struct gfs2_inode *ip; | |
145 | struct gfs2_glock *io_gl = NULL; | |
146 | int error; | |
147 | ||
148 | inode = gfs2_iget(sb, no_addr, non_block); | |
149 | ip = GFS2_I(inode); | |
150 | ||
151 | if (!inode) | |
ac3beb6a | 152 | return ERR_PTR(-ENOMEM); |
194c011f SW |
153 | |
154 | if (inode->i_state & I_NEW) { | |
155 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
156 | ip->i_no_formal_ino = no_formal_ino; | |
157 | ||
158 | error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); | |
159 | if (unlikely(error)) | |
160 | goto fail; | |
161 | ip->i_gl->gl_object = ip; | |
162 | ||
163 | error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); | |
164 | if (unlikely(error)) | |
165 | goto fail_put; | |
166 | ||
167 | set_bit(GIF_INVALID, &ip->i_flags); | |
168 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); | |
169 | if (unlikely(error)) | |
170 | goto fail_iopen; | |
171 | ||
172 | ip->i_iopen_gh.gh_gl->gl_object = ip; | |
173 | gfs2_glock_put(io_gl); | |
174 | io_gl = NULL; | |
175 | ||
176 | if (type == DT_UNKNOWN) { | |
177 | /* Inode glock must be locked already */ | |
178 | error = gfs2_inode_refresh(GFS2_I(inode)); | |
179 | if (error) | |
180 | goto fail_refresh; | |
181 | } else { | |
182 | inode->i_mode = DT2IF(type); | |
183 | } | |
184 | ||
185 | gfs2_set_iop(inode); | |
186 | unlock_new_inode(inode); | |
187 | } | |
188 | ||
189 | return inode; | |
190 | ||
191 | fail_refresh: | |
a6a4d98b | 192 | ip->i_iopen_gh.gh_flags |= GL_NOCACHE; |
194c011f SW |
193 | ip->i_iopen_gh.gh_gl->gl_object = NULL; |
194 | gfs2_glock_dq_uninit(&ip->i_iopen_gh); | |
195 | fail_iopen: | |
196 | if (io_gl) | |
197 | gfs2_glock_put(io_gl); | |
198 | fail_put: | |
199 | ip->i_gl->gl_object = NULL; | |
200 | gfs2_glock_put(ip->i_gl); | |
201 | fail: | |
202 | iget_failed(inode); | |
203 | return ERR_PTR(error); | |
204 | } | |
205 | ||
206 | struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, | |
207 | u64 *no_formal_ino, unsigned int blktype) | |
208 | { | |
209 | struct super_block *sb = sdp->sd_vfs; | |
210 | struct gfs2_holder i_gh; | |
211 | struct inode *inode = NULL; | |
212 | int error; | |
213 | ||
214 | /* Must not read in block until block type is verified */ | |
215 | error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops, | |
216 | LM_ST_EXCLUSIVE, GL_SKIP, &i_gh); | |
217 | if (error) | |
218 | return ERR_PTR(error); | |
219 | ||
220 | error = gfs2_check_blk_type(sdp, no_addr, blktype); | |
221 | if (error) | |
222 | goto fail; | |
223 | ||
224 | inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1); | |
225 | if (IS_ERR(inode)) | |
226 | goto fail; | |
227 | ||
228 | /* Two extra checks for NFS only */ | |
229 | if (no_formal_ino) { | |
230 | error = -ESTALE; | |
231 | if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino) | |
232 | goto fail_iput; | |
233 | ||
234 | error = -EIO; | |
235 | if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) | |
236 | goto fail_iput; | |
237 | ||
238 | error = 0; | |
239 | } | |
240 | ||
241 | fail: | |
242 | gfs2_glock_dq_uninit(&i_gh); | |
243 | return error ? ERR_PTR(error) : inode; | |
244 | fail_iput: | |
245 | iput(inode); | |
246 | goto fail; | |
247 | } | |
248 | ||
249 | ||
250 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) | |
251 | { | |
252 | struct qstr qstr; | |
253 | struct inode *inode; | |
254 | gfs2_str2qstr(&qstr, name); | |
255 | inode = gfs2_lookupi(dip, &qstr, 1); | |
256 | /* gfs2_lookupi has inconsistent callers: vfs | |
257 | * related routines expect NULL for no entry found, | |
258 | * gfs2_lookup_simple callers expect ENOENT | |
259 | * and do not check for NULL. | |
260 | */ | |
261 | if (inode == NULL) | |
262 | return ERR_PTR(-ENOENT); | |
263 | else | |
264 | return inode; | |
265 | } | |
266 | ||
267 | ||
268 | /** | |
269 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
270 | * @d_gh: An initialized holder for the directory glock | |
271 | * @name: The name of the inode to look for | |
272 | * @is_root: If 1, ignore the caller's permissions | |
273 | * @i_gh: An uninitialized holder for the new inode glock | |
274 | * | |
275 | * This can be called via the VFS filldir function when NFS is doing | |
276 | * a readdirplus and the inode which its intending to stat isn't | |
277 | * already in cache. In this case we must not take the directory glock | |
278 | * again, since the readdir call will have already taken that lock. | |
279 | * | |
280 | * Returns: errno | |
281 | */ | |
282 | ||
283 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, | |
284 | int is_root) | |
285 | { | |
286 | struct super_block *sb = dir->i_sb; | |
287 | struct gfs2_inode *dip = GFS2_I(dir); | |
288 | struct gfs2_holder d_gh; | |
289 | int error = 0; | |
290 | struct inode *inode = NULL; | |
291 | int unlock = 0; | |
292 | ||
293 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
294 | return ERR_PTR(-ENAMETOOLONG); | |
295 | ||
296 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || | |
297 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
298 | dir == sb->s_root->d_inode)) { | |
299 | igrab(dir); | |
300 | return dir; | |
301 | } | |
302 | ||
303 | if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { | |
304 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
305 | if (error) | |
306 | return ERR_PTR(error); | |
307 | unlock = 1; | |
308 | } | |
309 | ||
310 | if (!is_root) { | |
10556cb2 | 311 | error = gfs2_permission(dir, MAY_EXEC); |
194c011f SW |
312 | if (error) |
313 | goto out; | |
314 | } | |
315 | ||
5a00f3cc | 316 | inode = gfs2_dir_search(dir, name, false); |
194c011f SW |
317 | if (IS_ERR(inode)) |
318 | error = PTR_ERR(inode); | |
319 | out: | |
320 | if (unlock) | |
321 | gfs2_glock_dq_uninit(&d_gh); | |
322 | if (error == -ENOENT) | |
323 | return NULL; | |
324 | return inode ? inode : ERR_PTR(error); | |
325 | } | |
326 | ||
327 | /** | |
328 | * create_ok - OK to create a new on-disk inode here? | |
329 | * @dip: Directory in which dinode is to be created | |
330 | * @name: Name of new dinode | |
331 | * @mode: | |
332 | * | |
333 | * Returns: errno | |
334 | */ | |
335 | ||
336 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, | |
175a4eb7 | 337 | umode_t mode) |
194c011f SW |
338 | { |
339 | int error; | |
340 | ||
10556cb2 | 341 | error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); |
194c011f SW |
342 | if (error) |
343 | return error; | |
344 | ||
345 | /* Don't create entries in an unlinked directory */ | |
346 | if (!dip->i_inode.i_nlink) | |
347 | return -ENOENT; | |
348 | ||
194c011f SW |
349 | if (dip->i_entries == (u32)-1) |
350 | return -EFBIG; | |
351 | if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) | |
352 | return -EMLINK; | |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
c9aecf73 SW |
357 | static void munge_mode_uid_gid(const struct gfs2_inode *dip, |
358 | struct inode *inode) | |
194c011f SW |
359 | { |
360 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && | |
6b24c0d2 EB |
361 | (dip->i_inode.i_mode & S_ISUID) && |
362 | !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { | |
c9aecf73 SW |
363 | if (S_ISDIR(inode->i_mode)) |
364 | inode->i_mode |= S_ISUID; | |
6b24c0d2 | 365 | else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) |
c9aecf73 SW |
366 | inode->i_mode &= ~07111; |
367 | inode->i_uid = dip->i_inode.i_uid; | |
194c011f | 368 | } else |
c9aecf73 | 369 | inode->i_uid = current_fsuid(); |
194c011f SW |
370 | |
371 | if (dip->i_inode.i_mode & S_ISGID) { | |
c9aecf73 SW |
372 | if (S_ISDIR(inode->i_mode)) |
373 | inode->i_mode |= S_ISGID; | |
374 | inode->i_gid = dip->i_inode.i_gid; | |
194c011f | 375 | } else |
c9aecf73 | 376 | inode->i_gid = current_fsgid(); |
194c011f SW |
377 | } |
378 | ||
b2c8b3ea | 379 | static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks) |
194c011f | 380 | { |
c9aecf73 | 381 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b2c8b3ea | 382 | struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, }; |
194c011f SW |
383 | int error; |
384 | ||
fd4b4e04 | 385 | error = gfs2_quota_lock_check(ip); |
194c011f SW |
386 | if (error) |
387 | goto out; | |
388 | ||
7b9cff46 | 389 | error = gfs2_inplace_reserve(ip, &ap); |
fd4b4e04 SW |
390 | if (error) |
391 | goto out_quota; | |
392 | ||
b2c8b3ea | 393 | error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0); |
194c011f SW |
394 | if (error) |
395 | goto out_ipreserv; | |
396 | ||
b2c8b3ea | 397 | error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation); |
c9aecf73 SW |
398 | ip->i_no_formal_ino = ip->i_generation; |
399 | ip->i_inode.i_ino = ip->i_no_addr; | |
400 | ip->i_goal = ip->i_no_addr; | |
194c011f SW |
401 | |
402 | gfs2_trans_end(sdp); | |
403 | ||
404 | out_ipreserv: | |
c9aecf73 | 405 | gfs2_inplace_release(ip); |
fd4b4e04 SW |
406 | out_quota: |
407 | gfs2_quota_unlock(ip); | |
194c011f | 408 | out: |
194c011f SW |
409 | return error; |
410 | } | |
411 | ||
f2741d98 SW |
412 | static void gfs2_init_dir(struct buffer_head *dibh, |
413 | const struct gfs2_inode *parent) | |
e2d0a13b SW |
414 | { |
415 | struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; | |
416 | struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); | |
417 | ||
418 | gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); | |
419 | dent->de_inum = di->di_num; /* already GFS2 endian */ | |
420 | dent->de_type = cpu_to_be16(DT_DIR); | |
421 | ||
422 | dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); | |
423 | gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); | |
424 | gfs2_inum_out(parent, dent); | |
425 | dent->de_type = cpu_to_be16(DT_DIR); | |
426 | ||
427 | } | |
428 | ||
b2c8b3ea SW |
429 | /** |
430 | * gfs2_init_xattr - Initialise an xattr block for a new inode | |
431 | * @ip: The inode in question | |
432 | * | |
433 | * This sets up an empty xattr block for a new inode, ready to | |
434 | * take any ACLs, LSM xattrs, etc. | |
435 | */ | |
436 | ||
437 | static void gfs2_init_xattr(struct gfs2_inode *ip) | |
438 | { | |
439 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); | |
440 | struct buffer_head *bh; | |
441 | struct gfs2_ea_header *ea; | |
442 | ||
443 | bh = gfs2_meta_new(ip->i_gl, ip->i_eattr); | |
444 | gfs2_trans_add_meta(ip->i_gl, bh); | |
445 | gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA); | |
446 | gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header)); | |
447 | ||
448 | ea = GFS2_EA_BH2FIRST(bh); | |
449 | ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize); | |
450 | ea->ea_type = GFS2_EATYPE_UNUSED; | |
451 | ea->ea_flags = GFS2_EAFLAG_LAST; | |
452 | ||
453 | brelse(bh); | |
454 | } | |
455 | ||
194c011f SW |
456 | /** |
457 | * init_dinode - Fill in a new dinode structure | |
f2741d98 | 458 | * @dip: The directory this inode is being created in |
c9aecf73 | 459 | * @ip: The inode |
f2741d98 | 460 | * @symname: The symlink destination (if a symlink) |
f2741d98 | 461 | * @bhp: The buffer head (returned to caller) |
194c011f SW |
462 | * |
463 | */ | |
464 | ||
c9aecf73 | 465 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, |
79ba7480 | 466 | const char *symname) |
194c011f | 467 | { |
194c011f SW |
468 | struct gfs2_dinode *di; |
469 | struct buffer_head *dibh; | |
194c011f | 470 | |
c9aecf73 | 471 | dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); |
350a9b0a | 472 | gfs2_trans_add_meta(ip->i_gl, dibh); |
194c011f | 473 | di = (struct gfs2_dinode *)dibh->b_data; |
79ba7480 | 474 | gfs2_dinode_out(ip, di); |
194c011f | 475 | |
c9aecf73 SW |
476 | di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev)); |
477 | di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); | |
194c011f | 478 | di->__pad1 = 0; |
194c011f SW |
479 | di->__pad2 = 0; |
480 | di->__pad3 = 0; | |
194c011f | 481 | memset(&di->__pad4, 0, sizeof(di->__pad4)); |
194c011f | 482 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); |
79ba7480 | 483 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
160b4026 | 484 | |
c9aecf73 | 485 | switch(ip->i_inode.i_mode & S_IFMT) { |
160b4026 | 486 | case S_IFDIR: |
e2d0a13b | 487 | gfs2_init_dir(dibh, dip); |
160b4026 SW |
488 | break; |
489 | case S_IFLNK: | |
c9aecf73 | 490 | memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); |
160b4026 | 491 | break; |
e2d0a13b SW |
492 | } |
493 | ||
194c011f | 494 | set_buffer_uptodate(dibh); |
79ba7480 | 495 | brelse(dibh); |
194c011f SW |
496 | } |
497 | ||
534cf9ca SW |
498 | /** |
499 | * gfs2_trans_da_blocks - Calculate number of blocks to link inode | |
500 | * @dip: The directory we are linking into | |
501 | * @da: The dir add information | |
502 | * @nr_inodes: The number of inodes involved | |
503 | * | |
504 | * This calculate the number of blocks we need to reserve in a | |
505 | * transaction to link @nr_inodes into a directory. In most cases | |
506 | * @nr_inodes will be 2 (the directory plus the inode being linked in) | |
507 | * but in case of rename, 4 may be required. | |
508 | * | |
509 | * Returns: Number of blocks | |
510 | */ | |
511 | ||
512 | static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip, | |
513 | const struct gfs2_diradd *da, | |
514 | unsigned nr_inodes) | |
515 | { | |
516 | return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) + | |
517 | (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS; | |
518 | } | |
519 | ||
194c011f | 520 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
3c1c0ae1 | 521 | struct gfs2_inode *ip, struct gfs2_diradd *da) |
194c011f SW |
522 | { |
523 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
3c1c0ae1 | 524 | struct gfs2_alloc_parms ap = { .target = da->nr_blocks, }; |
194c011f SW |
525 | int error; |
526 | ||
3c1c0ae1 | 527 | if (da->nr_blocks) { |
28fb3027 | 528 | error = gfs2_quota_lock_check(dip); |
194c011f SW |
529 | if (error) |
530 | goto fail_quota_locks; | |
531 | ||
7b9cff46 | 532 | error = gfs2_inplace_reserve(dip, &ap); |
194c011f SW |
533 | if (error) |
534 | goto fail_quota_locks; | |
535 | ||
534cf9ca | 536 | error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0); |
194c011f SW |
537 | if (error) |
538 | goto fail_ipreserv; | |
539 | } else { | |
540 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); | |
541 | if (error) | |
542 | goto fail_quota_locks; | |
543 | } | |
544 | ||
2b47dad8 | 545 | error = gfs2_dir_add(&dip->i_inode, name, ip, da); |
194c011f SW |
546 | if (error) |
547 | goto fail_end_trans; | |
548 | ||
194c011f SW |
549 | fail_end_trans: |
550 | gfs2_trans_end(sdp); | |
194c011f | 551 | fail_ipreserv: |
fd4b4e04 | 552 | gfs2_inplace_release(dip); |
194c011f SW |
553 | fail_quota_locks: |
554 | gfs2_quota_unlock(dip); | |
194c011f SW |
555 | return error; |
556 | } | |
557 | ||
46cc1e5f | 558 | static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, |
9d8f13ba | 559 | void *fs_info) |
194c011f | 560 | { |
9d8f13ba MZ |
561 | const struct xattr *xattr; |
562 | int err = 0; | |
563 | ||
564 | for (xattr = xattr_array; xattr->name != NULL; xattr++) { | |
565 | err = __gfs2_xattr_set(inode, xattr->name, xattr->value, | |
566 | xattr->value_len, 0, | |
567 | GFS2_EATYPE_SECURITY); | |
568 | if (err < 0) | |
569 | break; | |
194c011f | 570 | } |
194c011f SW |
571 | return err; |
572 | } | |
b3b94faa | 573 | |
194c011f | 574 | /** |
f2741d98 SW |
575 | * gfs2_create_inode - Create a new inode |
576 | * @dir: The parent directory | |
577 | * @dentry: The new dentry | |
6d4ade98 | 578 | * @file: If non-NULL, the file which is being opened |
f2741d98 SW |
579 | * @mode: The permissions on the new inode |
580 | * @dev: For device nodes, this is the device number | |
581 | * @symname: For symlinks, this is the link destination | |
582 | * @size: The initial size of the inode (ignored for directories) | |
194c011f | 583 | * |
f2741d98 | 584 | * Returns: 0 on success, or error code |
194c011f SW |
585 | */ |
586 | ||
f2741d98 | 587 | static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, |
6d4ade98 | 588 | struct file *file, |
175a4eb7 | 589 | umode_t mode, dev_t dev, const char *symname, |
6d4ade98 | 590 | unsigned int size, int excl, int *opened) |
194c011f | 591 | { |
f2741d98 | 592 | const struct qstr *name = &dentry->d_name; |
e01580bf | 593 | struct posix_acl *default_acl, *acl; |
f2741d98 | 594 | struct gfs2_holder ghs[2]; |
194c011f | 595 | struct inode *inode = NULL; |
8e2e0047 | 596 | struct gfs2_inode *dip = GFS2_I(dir), *ip; |
194c011f | 597 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
c9aecf73 | 598 | struct gfs2_glock *io_gl; |
6d4ade98 | 599 | struct dentry *d; |
05978803 | 600 | int error, free_vfs_inode = 0; |
9dbe9610 | 601 | u32 aflags = 0; |
b2c8b3ea | 602 | unsigned blocks = 1; |
2b47dad8 | 603 | struct gfs2_diradd da = { .bh = NULL, }; |
194c011f SW |
604 | |
605 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
f2741d98 | 606 | return -ENAMETOOLONG; |
194c011f | 607 | |
0a305e49 BP |
608 | error = gfs2_rs_alloc(dip); |
609 | if (error) | |
610 | return error; | |
611 | ||
fd4b4e04 SW |
612 | error = gfs2_rindex_update(sdp); |
613 | if (error) | |
614 | return error; | |
615 | ||
f2741d98 | 616 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
194c011f SW |
617 | if (error) |
618 | goto fail; | |
619 | ||
620 | error = create_ok(dip, name, mode); | |
5a00f3cc SW |
621 | if (error) |
622 | goto fail_gunlock; | |
623 | ||
624 | inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); | |
625 | error = PTR_ERR(inode); | |
626 | if (!IS_ERR(inode)) { | |
6d4ade98 | 627 | d = d_splice_alias(inode, dentry); |
d57b9c9a BF |
628 | error = PTR_ERR(d); |
629 | if (IS_ERR(d)) | |
630 | goto fail_gunlock; | |
6d4ade98 | 631 | error = 0; |
0d0d1107 | 632 | if (file) { |
5ca1db41 MS |
633 | if (S_ISREG(inode->i_mode)) { |
634 | WARN_ON(d != NULL); | |
635 | error = finish_open(file, dentry, gfs2_open_common, opened); | |
636 | } else { | |
6d4ade98 | 637 | error = finish_no_open(file, d); |
5ca1db41 MS |
638 | } |
639 | } else { | |
640 | dput(d); | |
6d4ade98 | 641 | } |
9a63edd1 | 642 | gfs2_glock_dq_uninit(ghs); |
6d4ade98 | 643 | return error; |
5a00f3cc | 644 | } else if (error != -ENOENT) { |
194c011f | 645 | goto fail_gunlock; |
5a00f3cc | 646 | } |
194c011f | 647 | |
3c1c0ae1 | 648 | error = gfs2_diradd_alloc_required(dir, name, &da); |
fd4b4e04 SW |
649 | if (error < 0) |
650 | goto fail_gunlock; | |
651 | ||
c9aecf73 | 652 | inode = new_inode(sdp->sd_vfs); |
fd4b4e04 SW |
653 | error = -ENOMEM; |
654 | if (!inode) | |
655 | goto fail_gunlock; | |
656 | ||
e01580bf CH |
657 | error = posix_acl_create(dir, &mode, &default_acl, &acl); |
658 | if (error) | |
659 | goto fail_free_vfs_inode; | |
660 | ||
c9aecf73 SW |
661 | ip = GFS2_I(inode); |
662 | error = gfs2_rs_alloc(ip); | |
194c011f | 663 | if (error) |
e01580bf | 664 | goto fail_free_acls; |
c9aecf73 | 665 | |
c9aecf73 | 666 | inode->i_mode = mode; |
79ba7480 | 667 | set_nlink(inode, S_ISDIR(mode) ? 2 : 1); |
c9aecf73 SW |
668 | inode->i_rdev = dev; |
669 | inode->i_size = size; | |
fd4b4e04 | 670 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
28fb3027 | 671 | gfs2_set_inode_blocks(inode, 1); |
c9aecf73 SW |
672 | munge_mode_uid_gid(dip, inode); |
673 | ip->i_goal = dip->i_goal; | |
28fb3027 SW |
674 | ip->i_diskflags = 0; |
675 | ip->i_eattr = 0; | |
676 | ip->i_height = 0; | |
677 | ip->i_depth = 0; | |
678 | ip->i_entries = 0; | |
679 | ||
680 | switch(mode & S_IFMT) { | |
681 | case S_IFREG: | |
682 | if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || | |
683 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
684 | ip->i_diskflags |= GFS2_DIF_JDATA; | |
685 | gfs2_set_aops(inode); | |
686 | break; | |
687 | case S_IFDIR: | |
688 | ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); | |
689 | ip->i_diskflags |= GFS2_DIF_JDATA; | |
690 | ip->i_entries = 2; | |
691 | break; | |
692 | } | |
693 | gfs2_set_inode_flags(inode); | |
194c011f | 694 | |
9dbe9610 SW |
695 | if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || |
696 | (dip->i_diskflags & GFS2_DIF_TOPDIR)) | |
697 | aflags |= GFS2_AF_ORLOV; | |
698 | ||
b2c8b3ea SW |
699 | if (default_acl || acl) |
700 | blocks++; | |
701 | ||
702 | error = alloc_dinode(ip, aflags, &blocks); | |
194c011f | 703 | if (error) |
c9aecf73 | 704 | goto fail_free_inode; |
194c011f | 705 | |
b2c8b3ea SW |
706 | gfs2_set_inode_blocks(inode, blocks); |
707 | ||
c9aecf73 | 708 | error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
194c011f | 709 | if (error) |
c9aecf73 | 710 | goto fail_free_inode; |
194c011f | 711 | |
1e2d9d44 | 712 | ip->i_gl->gl_object = ip; |
c9aecf73 SW |
713 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); |
714 | if (error) | |
715 | goto fail_free_inode; | |
716 | ||
b2c8b3ea | 717 | error = gfs2_trans_begin(sdp, blocks, 0); |
c9aecf73 | 718 | if (error) |
194c011f SW |
719 | goto fail_gunlock2; |
720 | ||
b2c8b3ea SW |
721 | if (blocks > 1) { |
722 | ip->i_eattr = ip->i_no_addr + 1; | |
723 | gfs2_init_xattr(ip); | |
724 | } | |
79ba7480 | 725 | init_dinode(dip, ip, symname); |
fd4b4e04 SW |
726 | gfs2_trans_end(sdp); |
727 | ||
c9aecf73 | 728 | error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
194c011f SW |
729 | if (error) |
730 | goto fail_gunlock2; | |
731 | ||
c9aecf73 | 732 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); |
ff7f4cb4 SW |
733 | if (error) |
734 | goto fail_gunlock2; | |
0a305e49 | 735 | |
c9aecf73 SW |
736 | ip->i_iopen_gh.gh_gl->gl_object = ip; |
737 | gfs2_glock_put(io_gl); | |
738 | gfs2_set_iop(inode); | |
739 | insert_inode_hash(inode); | |
740 | ||
e01580bf CH |
741 | if (default_acl) { |
742 | error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT); | |
743 | posix_acl_release(default_acl); | |
744 | } | |
745 | if (acl) { | |
746 | if (!error) | |
747 | error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS); | |
748 | posix_acl_release(acl); | |
749 | } | |
750 | ||
194c011f | 751 | if (error) |
c9aecf73 | 752 | goto fail_gunlock3; |
194c011f | 753 | |
f45dc26d BP |
754 | error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name, |
755 | &gfs2_initxattrs, NULL); | |
194c011f | 756 | if (error) |
c9aecf73 | 757 | goto fail_gunlock3; |
194c011f | 758 | |
3c1c0ae1 | 759 | error = link_dinode(dip, name, ip, &da); |
194c011f | 760 | if (error) |
c9aecf73 | 761 | goto fail_gunlock3; |
194c011f | 762 | |
79ba7480 | 763 | mark_inode_dirty(inode); |
6d4ade98 | 764 | d_instantiate(dentry, inode); |
c5bf8fef MS |
765 | if (file) { |
766 | *opened |= FILE_CREATED; | |
6d4ade98 | 767 | error = finish_open(file, dentry, gfs2_open_common, opened); |
c5bf8fef | 768 | } |
28fb3027 SW |
769 | gfs2_glock_dq_uninit(ghs); |
770 | gfs2_glock_dq_uninit(ghs + 1); | |
6d4ade98 | 771 | return error; |
194c011f | 772 | |
c9aecf73 SW |
773 | fail_gunlock3: |
774 | gfs2_glock_dq_uninit(ghs + 1); | |
775 | if (ip->i_gl) | |
776 | gfs2_glock_put(ip->i_gl); | |
777 | goto fail_gunlock; | |
778 | ||
194c011f SW |
779 | fail_gunlock2: |
780 | gfs2_glock_dq_uninit(ghs + 1); | |
c9aecf73 SW |
781 | fail_free_inode: |
782 | if (ip->i_gl) | |
783 | gfs2_glock_put(ip->i_gl); | |
af5c2697 | 784 | gfs2_rs_delete(ip, NULL); |
e01580bf CH |
785 | fail_free_acls: |
786 | if (default_acl) | |
787 | posix_acl_release(default_acl); | |
788 | if (acl) | |
789 | posix_acl_release(acl); | |
790 | fail_free_vfs_inode: | |
05978803 | 791 | free_vfs_inode = 1; |
194c011f | 792 | fail_gunlock: |
2b47dad8 | 793 | gfs2_dir_no_add(&da); |
f2741d98 | 794 | gfs2_glock_dq_uninit(ghs); |
40ac218f | 795 | if (inode && !IS_ERR(inode)) { |
79ba7480 | 796 | clear_nlink(inode); |
05978803 AD |
797 | if (!free_vfs_inode) |
798 | mark_inode_dirty(inode); | |
799 | set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED, | |
800 | &GFS2_I(inode)->i_flags); | |
40ac218f SW |
801 | iput(inode); |
802 | } | |
194c011f | 803 | fail: |
f2741d98 | 804 | return error; |
194c011f | 805 | } |
f2741d98 | 806 | |
b3b94faa DT |
807 | /** |
808 | * gfs2_create - Create a file | |
809 | * @dir: The directory in which to create the file | |
810 | * @dentry: The dentry of the new file | |
811 | * @mode: The mode of the new file | |
812 | * | |
813 | * Returns: errno | |
814 | */ | |
815 | ||
816 | static int gfs2_create(struct inode *dir, struct dentry *dentry, | |
ebfc3b49 | 817 | umode_t mode, bool excl) |
b3b94faa | 818 | { |
6d4ade98 | 819 | return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL); |
b3b94faa DT |
820 | } |
821 | ||
822 | /** | |
6d4ade98 | 823 | * __gfs2_lookup - Look up a filename in a directory and return its inode |
b3b94faa DT |
824 | * @dir: The directory inode |
825 | * @dentry: The dentry of the new inode | |
6d4ade98 SW |
826 | * @file: File to be opened |
827 | * @opened: atomic_open flags | |
b3b94faa | 828 | * |
b3b94faa DT |
829 | * |
830 | * Returns: errno | |
831 | */ | |
832 | ||
6d4ade98 SW |
833 | static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, |
834 | struct file *file, int *opened) | |
b3b94faa | 835 | { |
6d4ade98 SW |
836 | struct inode *inode; |
837 | struct dentry *d; | |
838 | struct gfs2_holder gh; | |
839 | struct gfs2_glock *gl; | |
840 | int error; | |
841 | ||
842 | inode = gfs2_lookupi(dir, &dentry->d_name, 0); | |
843 | if (!inode) | |
844 | return NULL; | |
845 | if (IS_ERR(inode)) | |
846 | return ERR_CAST(inode); | |
847 | ||
848 | gl = GFS2_I(inode)->i_gl; | |
849 | error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); | |
850 | if (error) { | |
851 | iput(inode); | |
852 | return ERR_PTR(error); | |
9656b2c1 | 853 | } |
6d4ade98 SW |
854 | |
855 | d = d_splice_alias(inode, dentry); | |
d57b9c9a BF |
856 | if (IS_ERR(d)) { |
857 | iput(inode); | |
858 | gfs2_glock_dq_uninit(&gh); | |
859 | return d; | |
860 | } | |
6d4ade98 SW |
861 | if (file && S_ISREG(inode->i_mode)) |
862 | error = finish_open(file, dentry, gfs2_open_common, opened); | |
863 | ||
864 | gfs2_glock_dq_uninit(&gh); | |
5ca1db41 MS |
865 | if (error) { |
866 | dput(d); | |
6d4ade98 | 867 | return ERR_PTR(error); |
5ca1db41 | 868 | } |
6d4ade98 SW |
869 | return d; |
870 | } | |
871 | ||
872 | static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, | |
873 | unsigned flags) | |
874 | { | |
875 | return __gfs2_lookup(dir, dentry, NULL, NULL); | |
b3b94faa DT |
876 | } |
877 | ||
878 | /** | |
879 | * gfs2_link - Link to a file | |
880 | * @old_dentry: The inode to link | |
881 | * @dir: Add link to this directory | |
882 | * @dentry: The name of the link | |
883 | * | |
884 | * Link the inode in "old_dentry" into the directory "dir" with the | |
885 | * name in "dentry". | |
886 | * | |
887 | * Returns: errno | |
888 | */ | |
889 | ||
890 | static int gfs2_link(struct dentry *old_dentry, struct inode *dir, | |
891 | struct dentry *dentry) | |
892 | { | |
feaa7bba SW |
893 | struct gfs2_inode *dip = GFS2_I(dir); |
894 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa | 895 | struct inode *inode = old_dentry->d_inode; |
feaa7bba | 896 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 897 | struct gfs2_holder ghs[2]; |
2baee03f | 898 | struct buffer_head *dibh; |
2b47dad8 | 899 | struct gfs2_diradd da = { .bh = NULL, }; |
b3b94faa DT |
900 | int error; |
901 | ||
b60623c2 | 902 | if (S_ISDIR(inode->i_mode)) |
b3b94faa DT |
903 | return -EPERM; |
904 | ||
0a305e49 BP |
905 | error = gfs2_rs_alloc(dip); |
906 | if (error) | |
907 | return error; | |
908 | ||
b3b94faa DT |
909 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
910 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); | |
911 | ||
72dbf479 BP |
912 | error = gfs2_glock_nq(ghs); /* parent */ |
913 | if (error) | |
914 | goto out_parent; | |
915 | ||
916 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
b3b94faa | 917 | if (error) |
72dbf479 | 918 | goto out_child; |
b3b94faa | 919 | |
d192a8e5 SW |
920 | error = -ENOENT; |
921 | if (inode->i_nlink == 0) | |
922 | goto out_gunlock; | |
923 | ||
10556cb2 | 924 | error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); |
b3b94faa DT |
925 | if (error) |
926 | goto out_gunlock; | |
927 | ||
dbb7cae2 | 928 | error = gfs2_dir_check(dir, &dentry->d_name, NULL); |
b3b94faa DT |
929 | switch (error) { |
930 | case -ENOENT: | |
931 | break; | |
932 | case 0: | |
933 | error = -EEXIST; | |
934 | default: | |
935 | goto out_gunlock; | |
936 | } | |
937 | ||
938 | error = -EINVAL; | |
4f56110a | 939 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
940 | goto out_gunlock; |
941 | error = -EFBIG; | |
ad6203f2 | 942 | if (dip->i_entries == (u32)-1) |
b3b94faa DT |
943 | goto out_gunlock; |
944 | error = -EPERM; | |
945 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
946 | goto out_gunlock; | |
947 | error = -EINVAL; | |
4f56110a | 948 | if (!ip->i_inode.i_nlink) |
b3b94faa DT |
949 | goto out_gunlock; |
950 | error = -EMLINK; | |
4f56110a | 951 | if (ip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
952 | goto out_gunlock; |
953 | ||
3c1c0ae1 | 954 | error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da); |
c752666c | 955 | if (error < 0) |
b3b94faa DT |
956 | goto out_gunlock; |
957 | ||
3c1c0ae1 SW |
958 | if (da.nr_blocks) { |
959 | struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; | |
d82661d9 | 960 | error = gfs2_quota_lock_check(dip); |
b3b94faa | 961 | if (error) |
5407e242 | 962 | goto out_gunlock; |
b3b94faa | 963 | |
7b9cff46 | 964 | error = gfs2_inplace_reserve(dip, &ap); |
b3b94faa DT |
965 | if (error) |
966 | goto out_gunlock_q; | |
967 | ||
534cf9ca | 968 | error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0); |
b3b94faa DT |
969 | if (error) |
970 | goto out_ipres; | |
971 | } else { | |
972 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); | |
973 | if (error) | |
974 | goto out_ipres; | |
975 | } | |
976 | ||
2baee03f | 977 | error = gfs2_meta_inode_buffer(ip, &dibh); |
b3b94faa DT |
978 | if (error) |
979 | goto out_end_trans; | |
980 | ||
2b47dad8 | 981 | error = gfs2_dir_add(dir, &dentry->d_name, ip, &da); |
2baee03f SW |
982 | if (error) |
983 | goto out_brelse; | |
984 | ||
350a9b0a | 985 | gfs2_trans_add_meta(ip->i_gl, dibh); |
2baee03f SW |
986 | inc_nlink(&ip->i_inode); |
987 | ip->i_inode.i_ctime = CURRENT_TIME; | |
ab9bbda0 SW |
988 | ihold(inode); |
989 | d_instantiate(dentry, inode); | |
990 | mark_inode_dirty(inode); | |
b3b94faa | 991 | |
2baee03f SW |
992 | out_brelse: |
993 | brelse(dibh); | |
feaa7bba | 994 | out_end_trans: |
b3b94faa | 995 | gfs2_trans_end(sdp); |
feaa7bba | 996 | out_ipres: |
3c1c0ae1 | 997 | if (da.nr_blocks) |
b3b94faa | 998 | gfs2_inplace_release(dip); |
feaa7bba | 999 | out_gunlock_q: |
3c1c0ae1 | 1000 | if (da.nr_blocks) |
b3b94faa | 1001 | gfs2_quota_unlock(dip); |
feaa7bba | 1002 | out_gunlock: |
2b47dad8 | 1003 | gfs2_dir_no_add(&da); |
72dbf479 BP |
1004 | gfs2_glock_dq(ghs + 1); |
1005 | out_child: | |
1006 | gfs2_glock_dq(ghs); | |
1007 | out_parent: | |
b3b94faa DT |
1008 | gfs2_holder_uninit(ghs); |
1009 | gfs2_holder_uninit(ghs + 1); | |
b3b94faa DT |
1010 | return error; |
1011 | } | |
1012 | ||
87ec2174 SW |
1013 | /* |
1014 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
1015 | * @dip: the directory | |
1016 | * @name: the name of the file | |
1017 | * @ip: the inode | |
1018 | * | |
1019 | * Assumes that the lock on (at least) @dip is held. | |
1020 | * | |
1021 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
1022 | */ | |
1023 | ||
1024 | static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, | |
1025 | const struct gfs2_inode *ip) | |
1026 | { | |
1027 | int error; | |
1028 | ||
1029 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) | |
1030 | return -EPERM; | |
1031 | ||
1032 | if ((dip->i_inode.i_mode & S_ISVTX) && | |
6b24c0d2 EB |
1033 | !uid_eq(dip->i_inode.i_uid, current_fsuid()) && |
1034 | !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) | |
87ec2174 SW |
1035 | return -EPERM; |
1036 | ||
1037 | if (IS_APPEND(&dip->i_inode)) | |
1038 | return -EPERM; | |
1039 | ||
10556cb2 | 1040 | error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); |
87ec2174 SW |
1041 | if (error) |
1042 | return error; | |
1043 | ||
1044 | error = gfs2_dir_check(&dip->i_inode, name, ip); | |
1045 | if (error) | |
1046 | return error; | |
1047 | ||
1048 | return 0; | |
1049 | } | |
1050 | ||
b3b94faa | 1051 | /** |
855d23ce SW |
1052 | * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it |
1053 | * @dip: The parent directory | |
1054 | * @name: The name of the entry in the parent directory | |
855d23ce SW |
1055 | * @inode: The inode to be removed |
1056 | * | |
1057 | * Called with all the locks and in a transaction. This will only be | |
1058 | * called for a directory after it has been checked to ensure it is empty. | |
1059 | * | |
1060 | * Returns: 0 on success, or an error | |
1061 | */ | |
1062 | ||
1063 | static int gfs2_unlink_inode(struct gfs2_inode *dip, | |
4327a9bf | 1064 | const struct dentry *dentry) |
855d23ce SW |
1065 | { |
1066 | struct inode *inode = dentry->d_inode; | |
1067 | struct gfs2_inode *ip = GFS2_I(inode); | |
1068 | int error; | |
1069 | ||
1070 | error = gfs2_dir_del(dip, dentry); | |
1071 | if (error) | |
1072 | return error; | |
1073 | ||
1074 | ip->i_entries = 0; | |
1075 | inode->i_ctime = CURRENT_TIME; | |
1076 | if (S_ISDIR(inode->i_mode)) | |
1077 | clear_nlink(inode); | |
1078 | else | |
1079 | drop_nlink(inode); | |
855d23ce SW |
1080 | mark_inode_dirty(inode); |
1081 | if (inode->i_nlink == 0) | |
1082 | gfs2_unlink_di(inode); | |
1083 | return 0; | |
1084 | } | |
1085 | ||
1086 | ||
1087 | /** | |
1088 | * gfs2_unlink - Unlink an inode (this does rmdir as well) | |
1089 | * @dir: The inode of the directory containing the inode to unlink | |
b3b94faa DT |
1090 | * @dentry: The file itself |
1091 | * | |
855d23ce SW |
1092 | * This routine uses the type of the inode as a flag to figure out |
1093 | * whether this is an unlink or an rmdir. | |
b3b94faa DT |
1094 | * |
1095 | * Returns: errno | |
1096 | */ | |
1097 | ||
1098 | static int gfs2_unlink(struct inode *dir, struct dentry *dentry) | |
1099 | { | |
feaa7bba SW |
1100 | struct gfs2_inode *dip = GFS2_I(dir); |
1101 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
855d23ce SW |
1102 | struct inode *inode = dentry->d_inode; |
1103 | struct gfs2_inode *ip = GFS2_I(inode); | |
ddee7608 RC |
1104 | struct gfs2_holder ghs[3]; |
1105 | struct gfs2_rgrpd *rgd; | |
5e2f7d61 BP |
1106 | int error; |
1107 | ||
1108 | error = gfs2_rindex_update(sdp); | |
1109 | if (error) | |
1110 | return error; | |
1111 | ||
1112 | error = -EROFS; | |
b3b94faa | 1113 | |
b3b94faa | 1114 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
ddee7608 | 1115 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); |
b3b94faa | 1116 | |
66fc061b | 1117 | rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); |
a365fbf3 | 1118 | if (!rgd) |
87654896 | 1119 | goto out_inodes; |
a365fbf3 | 1120 | |
ddee7608 RC |
1121 | gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); |
1122 | ||
1123 | ||
8497a46e | 1124 | error = gfs2_glock_nq(ghs); /* parent */ |
b3b94faa | 1125 | if (error) |
8497a46e SW |
1126 | goto out_parent; |
1127 | ||
1128 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
1129 | if (error) | |
1130 | goto out_child; | |
1131 | ||
d192a8e5 | 1132 | error = -ENOENT; |
855d23ce | 1133 | if (inode->i_nlink == 0) |
d192a8e5 SW |
1134 | goto out_rgrp; |
1135 | ||
855d23ce SW |
1136 | if (S_ISDIR(inode->i_mode)) { |
1137 | error = -ENOTEMPTY; | |
1138 | if (ip->i_entries > 2 || inode->i_nlink > 2) | |
1139 | goto out_rgrp; | |
1140 | } | |
1141 | ||
8497a46e SW |
1142 | error = gfs2_glock_nq(ghs + 2); /* rgrp */ |
1143 | if (error) | |
1144 | goto out_rgrp; | |
b3b94faa DT |
1145 | |
1146 | error = gfs2_unlink_ok(dip, &dentry->d_name, ip); | |
1147 | if (error) | |
72dbf479 | 1148 | goto out_gunlock; |
b3b94faa | 1149 | |
855d23ce | 1150 | error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); |
855d23ce SW |
1151 | if (error) |
1152 | goto out_end_trans; | |
b3b94faa | 1153 | |
4327a9bf | 1154 | error = gfs2_unlink_inode(dip, dentry); |
b3b94faa | 1155 | |
feaa7bba SW |
1156 | out_end_trans: |
1157 | gfs2_trans_end(sdp); | |
72dbf479 | 1158 | out_gunlock: |
8497a46e SW |
1159 | gfs2_glock_dq(ghs + 2); |
1160 | out_rgrp: | |
8497a46e SW |
1161 | gfs2_glock_dq(ghs + 1); |
1162 | out_child: | |
8497a46e SW |
1163 | gfs2_glock_dq(ghs); |
1164 | out_parent: | |
87654896 SW |
1165 | gfs2_holder_uninit(ghs + 2); |
1166 | out_inodes: | |
1167 | gfs2_holder_uninit(ghs + 1); | |
8497a46e | 1168 | gfs2_holder_uninit(ghs); |
b3b94faa DT |
1169 | return error; |
1170 | } | |
1171 | ||
1172 | /** | |
1173 | * gfs2_symlink - Create a symlink | |
1174 | * @dir: The directory to create the symlink in | |
1175 | * @dentry: The dentry to put the symlink in | |
1176 | * @symname: The thing which the link points to | |
1177 | * | |
1178 | * Returns: errno | |
1179 | */ | |
1180 | ||
1181 | static int gfs2_symlink(struct inode *dir, struct dentry *dentry, | |
1182 | const char *symname) | |
1183 | { | |
feaa7bba | 1184 | struct gfs2_sbd *sdp = GFS2_SB(dir); |
160b4026 | 1185 | unsigned int size; |
b3b94faa | 1186 | |
b3b94faa DT |
1187 | size = strlen(symname); |
1188 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) | |
1189 | return -ENAMETOOLONG; | |
1190 | ||
6d4ade98 | 1191 | return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL); |
b3b94faa DT |
1192 | } |
1193 | ||
1194 | /** | |
1195 | * gfs2_mkdir - Make a directory | |
1196 | * @dir: The parent directory of the new one | |
1197 | * @dentry: The dentry of the new directory | |
1198 | * @mode: The mode of the new directory | |
1199 | * | |
1200 | * Returns: errno | |
1201 | */ | |
1202 | ||
18bb1db3 | 1203 | static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
b3b94faa | 1204 | { |
28fb3027 SW |
1205 | struct gfs2_sbd *sdp = GFS2_SB(dir); |
1206 | unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); | |
6d4ade98 | 1207 | return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL); |
b3b94faa DT |
1208 | } |
1209 | ||
b3b94faa DT |
1210 | /** |
1211 | * gfs2_mknod - Make a special file | |
1212 | * @dir: The directory in which the special file will reside | |
1213 | * @dentry: The dentry of the special file | |
1214 | * @mode: The mode of the special file | |
f2741d98 | 1215 | * @dev: The device specification of the special file |
b3b94faa DT |
1216 | * |
1217 | */ | |
1218 | ||
1a67aafb | 1219 | static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, |
b3b94faa DT |
1220 | dev_t dev) |
1221 | { | |
6d4ade98 SW |
1222 | return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL); |
1223 | } | |
1224 | ||
1225 | /** | |
1226 | * gfs2_atomic_open - Atomically open a file | |
1227 | * @dir: The directory | |
1228 | * @dentry: The proposed new entry | |
1229 | * @file: The proposed new struct file | |
1230 | * @flags: open flags | |
1231 | * @mode: File mode | |
1232 | * @opened: Flag to say whether the file has been opened or not | |
1233 | * | |
1234 | * Returns: error code or 0 for success | |
1235 | */ | |
1236 | ||
1237 | static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, | |
1238 | struct file *file, unsigned flags, | |
1239 | umode_t mode, int *opened) | |
1240 | { | |
1241 | struct dentry *d; | |
1242 | bool excl = !!(flags & O_EXCL); | |
1243 | ||
1244 | d = __gfs2_lookup(dir, dentry, file, opened); | |
1245 | if (IS_ERR(d)) | |
1246 | return PTR_ERR(d); | |
5ca1db41 MS |
1247 | if (d != NULL) |
1248 | dentry = d; | |
1249 | if (dentry->d_inode) { | |
ea0341e0 SW |
1250 | if (!(*opened & FILE_OPENED)) { |
1251 | if (d == NULL) | |
1252 | dget(dentry); | |
5ca1db41 | 1253 | return finish_no_open(file, dentry); |
ea0341e0 | 1254 | } |
5ca1db41 | 1255 | dput(d); |
6d4ade98 SW |
1256 | return 0; |
1257 | } | |
1258 | ||
5ca1db41 | 1259 | BUG_ON(d != NULL); |
6d4ade98 SW |
1260 | if (!(flags & O_CREAT)) |
1261 | return -ENOENT; | |
1262 | ||
1263 | return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened); | |
b3b94faa DT |
1264 | } |
1265 | ||
0188d6c5 SW |
1266 | /* |
1267 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1268 | * @this: move this | |
1269 | * @to: to here | |
1270 | * | |
1271 | * Follow @to back to the root and make sure we don't encounter @this | |
1272 | * Assumes we already hold the rename lock. | |
1273 | * | |
1274 | * Returns: errno | |
1275 | */ | |
1276 | ||
1277 | static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1278 | { | |
1279 | struct inode *dir = &to->i_inode; | |
1280 | struct super_block *sb = dir->i_sb; | |
1281 | struct inode *tmp; | |
0188d6c5 SW |
1282 | int error = 0; |
1283 | ||
0188d6c5 SW |
1284 | igrab(dir); |
1285 | ||
1286 | for (;;) { | |
1287 | if (dir == &this->i_inode) { | |
1288 | error = -EINVAL; | |
1289 | break; | |
1290 | } | |
1291 | if (dir == sb->s_root->d_inode) { | |
1292 | error = 0; | |
1293 | break; | |
1294 | } | |
1295 | ||
8d123585 | 1296 | tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); |
48f8f711 AD |
1297 | if (!tmp) { |
1298 | error = -ENOENT; | |
1299 | break; | |
1300 | } | |
0188d6c5 SW |
1301 | if (IS_ERR(tmp)) { |
1302 | error = PTR_ERR(tmp); | |
1303 | break; | |
1304 | } | |
1305 | ||
1306 | iput(dir); | |
1307 | dir = tmp; | |
1308 | } | |
1309 | ||
1310 | iput(dir); | |
1311 | ||
1312 | return error; | |
1313 | } | |
1314 | ||
b3b94faa DT |
1315 | /** |
1316 | * gfs2_rename - Rename a file | |
1317 | * @odir: Parent directory of old file name | |
1318 | * @odentry: The old dentry of the file | |
1319 | * @ndir: Parent directory of new file name | |
1320 | * @ndentry: The new dentry of the file | |
1321 | * | |
1322 | * Returns: errno | |
1323 | */ | |
1324 | ||
1325 | static int gfs2_rename(struct inode *odir, struct dentry *odentry, | |
1326 | struct inode *ndir, struct dentry *ndentry) | |
1327 | { | |
feaa7bba SW |
1328 | struct gfs2_inode *odip = GFS2_I(odir); |
1329 | struct gfs2_inode *ndip = GFS2_I(ndir); | |
1330 | struct gfs2_inode *ip = GFS2_I(odentry->d_inode); | |
b3b94faa | 1331 | struct gfs2_inode *nip = NULL; |
feaa7bba | 1332 | struct gfs2_sbd *sdp = GFS2_SB(odir); |
8339ee54 | 1333 | struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; |
ddee7608 | 1334 | struct gfs2_rgrpd *nrgd; |
b3b94faa DT |
1335 | unsigned int num_gh; |
1336 | int dir_rename = 0; | |
3c1c0ae1 | 1337 | struct gfs2_diradd da = { .nr_blocks = 0, }; |
b3b94faa DT |
1338 | unsigned int x; |
1339 | int error; | |
1340 | ||
b3b94faa | 1341 | if (ndentry->d_inode) { |
feaa7bba | 1342 | nip = GFS2_I(ndentry->d_inode); |
b3b94faa DT |
1343 | if (ip == nip) |
1344 | return 0; | |
1345 | } | |
1346 | ||
5e2f7d61 BP |
1347 | error = gfs2_rindex_update(sdp); |
1348 | if (error) | |
1349 | return error; | |
1350 | ||
0a305e49 BP |
1351 | error = gfs2_rs_alloc(ndip); |
1352 | if (error) | |
1353 | return error; | |
1354 | ||
0188d6c5 SW |
1355 | if (odip != ndip) { |
1356 | error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, | |
1357 | 0, &r_gh); | |
b3b94faa DT |
1358 | if (error) |
1359 | goto out; | |
1360 | ||
0188d6c5 SW |
1361 | if (S_ISDIR(ip->i_inode.i_mode)) { |
1362 | dir_rename = 1; | |
1363 | /* don't move a dirctory into it's subdir */ | |
1364 | error = gfs2_ok_to_move(ip, ndip); | |
1365 | if (error) | |
1366 | goto out_gunlock_r; | |
1367 | } | |
b3b94faa DT |
1368 | } |
1369 | ||
d9d1ca30 | 1370 | num_gh = 1; |
b3b94faa | 1371 | gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
d9d1ca30 SW |
1372 | if (odip != ndip) { |
1373 | gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1374 | num_gh++; | |
1375 | } | |
1376 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1377 | num_gh++; | |
b3b94faa | 1378 | |
d9d1ca30 SW |
1379 | if (nip) { |
1380 | gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1381 | num_gh++; | |
ddee7608 RC |
1382 | /* grab the resource lock for unlink flag twiddling |
1383 | * this is the case of the target file already existing | |
1384 | * so we unlink before doing the rename | |
1385 | */ | |
66fc061b | 1386 | nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); |
ddee7608 RC |
1387 | if (nrgd) |
1388 | gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); | |
d9d1ca30 | 1389 | } |
b3b94faa | 1390 | |
72dbf479 BP |
1391 | for (x = 0; x < num_gh; x++) { |
1392 | error = gfs2_glock_nq(ghs + x); | |
1393 | if (error) | |
1394 | goto out_gunlock; | |
1395 | } | |
b3b94faa | 1396 | |
d192a8e5 SW |
1397 | error = -ENOENT; |
1398 | if (ip->i_inode.i_nlink == 0) | |
1399 | goto out_gunlock; | |
1400 | ||
b3b94faa DT |
1401 | /* Check out the old directory */ |
1402 | ||
1403 | error = gfs2_unlink_ok(odip, &odentry->d_name, ip); | |
1404 | if (error) | |
1405 | goto out_gunlock; | |
1406 | ||
1407 | /* Check out the new directory */ | |
1408 | ||
1409 | if (nip) { | |
1410 | error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); | |
1411 | if (error) | |
1412 | goto out_gunlock; | |
1413 | ||
d192a8e5 SW |
1414 | if (nip->i_inode.i_nlink == 0) { |
1415 | error = -EAGAIN; | |
1416 | goto out_gunlock; | |
1417 | } | |
1418 | ||
b60623c2 | 1419 | if (S_ISDIR(nip->i_inode.i_mode)) { |
ad6203f2 | 1420 | if (nip->i_entries < 2) { |
94fb763b | 1421 | gfs2_consist_inode(nip); |
b3b94faa DT |
1422 | error = -EIO; |
1423 | goto out_gunlock; | |
1424 | } | |
ad6203f2 | 1425 | if (nip->i_entries > 2) { |
b3b94faa DT |
1426 | error = -ENOTEMPTY; |
1427 | goto out_gunlock; | |
1428 | } | |
1429 | } | |
1430 | } else { | |
10556cb2 | 1431 | error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); |
b3b94faa DT |
1432 | if (error) |
1433 | goto out_gunlock; | |
1434 | ||
dbb7cae2 | 1435 | error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); |
b3b94faa DT |
1436 | switch (error) { |
1437 | case -ENOENT: | |
1438 | error = 0; | |
1439 | break; | |
1440 | case 0: | |
1441 | error = -EEXIST; | |
1442 | default: | |
1443 | goto out_gunlock; | |
1444 | }; | |
1445 | ||
1446 | if (odip != ndip) { | |
4f56110a | 1447 | if (!ndip->i_inode.i_nlink) { |
d192a8e5 | 1448 | error = -ENOENT; |
b3b94faa DT |
1449 | goto out_gunlock; |
1450 | } | |
ad6203f2 | 1451 | if (ndip->i_entries == (u32)-1) { |
b3b94faa DT |
1452 | error = -EFBIG; |
1453 | goto out_gunlock; | |
1454 | } | |
b60623c2 | 1455 | if (S_ISDIR(ip->i_inode.i_mode) && |
4f56110a | 1456 | ndip->i_inode.i_nlink == (u32)-1) { |
b3b94faa DT |
1457 | error = -EMLINK; |
1458 | goto out_gunlock; | |
1459 | } | |
1460 | } | |
1461 | } | |
1462 | ||
1463 | /* Check out the dir to be renamed */ | |
1464 | ||
1465 | if (dir_rename) { | |
10556cb2 | 1466 | error = gfs2_permission(odentry->d_inode, MAY_WRITE); |
b3b94faa DT |
1467 | if (error) |
1468 | goto out_gunlock; | |
1469 | } | |
1470 | ||
3c1c0ae1 SW |
1471 | if (nip == NULL) { |
1472 | error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da); | |
1473 | if (error) | |
1474 | goto out_gunlock; | |
1475 | } | |
b3b94faa | 1476 | |
3c1c0ae1 SW |
1477 | if (da.nr_blocks) { |
1478 | struct gfs2_alloc_parms ap = { .target = da.nr_blocks, }; | |
d82661d9 | 1479 | error = gfs2_quota_lock_check(ndip); |
b3b94faa | 1480 | if (error) |
5407e242 | 1481 | goto out_gunlock; |
b3b94faa | 1482 | |
7b9cff46 | 1483 | error = gfs2_inplace_reserve(ndip, &ap); |
b3b94faa DT |
1484 | if (error) |
1485 | goto out_gunlock_q; | |
1486 | ||
534cf9ca SW |
1487 | error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) + |
1488 | 4 * RES_LEAF + 4, 0); | |
b3b94faa DT |
1489 | if (error) |
1490 | goto out_ipreserv; | |
1491 | } else { | |
1492 | error = gfs2_trans_begin(sdp, 4 * RES_DINODE + | |
87d21e07 | 1493 | 5 * RES_LEAF + 4, 0); |
b3b94faa DT |
1494 | if (error) |
1495 | goto out_gunlock; | |
1496 | } | |
1497 | ||
1498 | /* Remove the target file, if it exists */ | |
1499 | ||
4327a9bf BP |
1500 | if (nip) |
1501 | error = gfs2_unlink_inode(ndip, ndentry); | |
b3b94faa DT |
1502 | |
1503 | if (dir_rename) { | |
8d123585 | 1504 | error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); |
b3b94faa DT |
1505 | if (error) |
1506 | goto out_end_trans; | |
1507 | } else { | |
1508 | struct buffer_head *dibh; | |
1509 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1510 | if (error) | |
1511 | goto out_end_trans; | |
4bd91ba1 | 1512 | ip->i_inode.i_ctime = CURRENT_TIME; |
350a9b0a | 1513 | gfs2_trans_add_meta(ip->i_gl, dibh); |
539e5d6b | 1514 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1515 | brelse(dibh); |
1516 | } | |
1517 | ||
855d23ce | 1518 | error = gfs2_dir_del(odip, odentry); |
b3b94faa DT |
1519 | if (error) |
1520 | goto out_end_trans; | |
1521 | ||
2b47dad8 | 1522 | error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da); |
b3b94faa DT |
1523 | if (error) |
1524 | goto out_end_trans; | |
1525 | ||
feaa7bba | 1526 | out_end_trans: |
b3b94faa | 1527 | gfs2_trans_end(sdp); |
feaa7bba | 1528 | out_ipreserv: |
3c1c0ae1 | 1529 | if (da.nr_blocks) |
b3b94faa | 1530 | gfs2_inplace_release(ndip); |
feaa7bba | 1531 | out_gunlock_q: |
3c1c0ae1 | 1532 | if (da.nr_blocks) |
b3b94faa | 1533 | gfs2_quota_unlock(ndip); |
feaa7bba | 1534 | out_gunlock: |
2b47dad8 | 1535 | gfs2_dir_no_add(&da); |
72dbf479 BP |
1536 | while (x--) { |
1537 | gfs2_glock_dq(ghs + x); | |
b3b94faa | 1538 | gfs2_holder_uninit(ghs + x); |
72dbf479 | 1539 | } |
feaa7bba | 1540 | out_gunlock_r: |
0188d6c5 | 1541 | if (r_gh.gh_gl) |
b3b94faa | 1542 | gfs2_glock_dq_uninit(&r_gh); |
feaa7bba | 1543 | out: |
b3b94faa DT |
1544 | return error; |
1545 | } | |
1546 | ||
536baf02 | 1547 | /** |
c177c2ac AV |
1548 | * gfs2_follow_link - Follow a symbolic link |
1549 | * @dentry: The dentry of the link | |
1550 | * @nd: Data that we pass to vfs_follow_link() | |
536baf02 | 1551 | * |
c177c2ac | 1552 | * This can handle symlinks of any size. |
536baf02 | 1553 | * |
c177c2ac | 1554 | * Returns: 0 on success or error code |
536baf02 SW |
1555 | */ |
1556 | ||
c177c2ac | 1557 | static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) |
536baf02 | 1558 | { |
c177c2ac | 1559 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); |
536baf02 SW |
1560 | struct gfs2_holder i_gh; |
1561 | struct buffer_head *dibh; | |
160b4026 | 1562 | unsigned int size; |
c177c2ac | 1563 | char *buf; |
536baf02 SW |
1564 | int error; |
1565 | ||
1566 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); | |
1567 | error = gfs2_glock_nq(&i_gh); | |
1568 | if (error) { | |
1569 | gfs2_holder_uninit(&i_gh); | |
c177c2ac AV |
1570 | nd_set_link(nd, ERR_PTR(error)); |
1571 | return NULL; | |
536baf02 SW |
1572 | } |
1573 | ||
a2e0f799 SW |
1574 | size = (unsigned int)i_size_read(&ip->i_inode); |
1575 | if (size == 0) { | |
536baf02 | 1576 | gfs2_consist_inode(ip); |
c177c2ac | 1577 | buf = ERR_PTR(-EIO); |
536baf02 SW |
1578 | goto out; |
1579 | } | |
1580 | ||
1581 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
c177c2ac AV |
1582 | if (error) { |
1583 | buf = ERR_PTR(error); | |
536baf02 | 1584 | goto out; |
536baf02 SW |
1585 | } |
1586 | ||
160b4026 | 1587 | buf = kzalloc(size + 1, GFP_NOFS); |
c177c2ac AV |
1588 | if (!buf) |
1589 | buf = ERR_PTR(-ENOMEM); | |
1590 | else | |
160b4026 | 1591 | memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); |
536baf02 SW |
1592 | brelse(dibh); |
1593 | out: | |
1594 | gfs2_glock_dq_uninit(&i_gh); | |
c177c2ac AV |
1595 | nd_set_link(nd, buf); |
1596 | return NULL; | |
b3b94faa DT |
1597 | } |
1598 | ||
b3b94faa DT |
1599 | /** |
1600 | * gfs2_permission - | |
75d5cfbe SW |
1601 | * @inode: The inode |
1602 | * @mask: The mask to be tested | |
1603 | * @flags: Indicates whether this is an RCU path walk or not | |
b3b94faa | 1604 | * |
300c7d75 SW |
1605 | * This may be called from the VFS directly, or from within GFS2 with the |
1606 | * inode locked, so we look to see if the glock is already locked and only | |
1607 | * lock the glock if its not already been done. | |
1608 | * | |
b3b94faa DT |
1609 | * Returns: errno |
1610 | */ | |
1611 | ||
10556cb2 | 1612 | int gfs2_permission(struct inode *inode, int mask) |
b3b94faa | 1613 | { |
b74c79e9 | 1614 | struct gfs2_inode *ip; |
b3b94faa DT |
1615 | struct gfs2_holder i_gh; |
1616 | int error; | |
300c7d75 | 1617 | int unlock = 0; |
b3b94faa | 1618 | |
b74c79e9 NP |
1619 | |
1620 | ip = GFS2_I(inode); | |
7afd88d9 | 1621 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
10556cb2 | 1622 | if (mask & MAY_NOT_BLOCK) |
75d5cfbe | 1623 | return -ECHILD; |
300c7d75 SW |
1624 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
1625 | if (error) | |
1626 | return error; | |
1627 | unlock = 1; | |
1628 | } | |
b3b94faa | 1629 | |
f58ba889 MS |
1630 | if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) |
1631 | error = -EACCES; | |
1632 | else | |
2830ba7f | 1633 | error = generic_permission(inode, mask); |
300c7d75 | 1634 | if (unlock) |
b3b94faa | 1635 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1636 | |
1637 | return error; | |
1638 | } | |
1639 | ||
ab9bbda0 | 1640 | static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) |
194c011f | 1641 | { |
194c011f SW |
1642 | setattr_copy(inode, attr); |
1643 | mark_inode_dirty(inode); | |
194c011f SW |
1644 | return 0; |
1645 | } | |
1646 | ||
1647 | /** | |
1648 | * gfs2_setattr_simple - | |
1649 | * @ip: | |
1650 | * @attr: | |
1651 | * | |
1652 | * Returns: errno | |
1653 | */ | |
1654 | ||
ab9bbda0 | 1655 | int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) |
194c011f SW |
1656 | { |
1657 | int error; | |
1658 | ||
1659 | if (current->journal_info) | |
ab9bbda0 | 1660 | return __gfs2_setattr_simple(inode, attr); |
194c011f | 1661 | |
ab9bbda0 | 1662 | error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); |
194c011f SW |
1663 | if (error) |
1664 | return error; | |
1665 | ||
ab9bbda0 SW |
1666 | error = __gfs2_setattr_simple(inode, attr); |
1667 | gfs2_trans_end(GFS2_SB(inode)); | |
194c011f SW |
1668 | return error; |
1669 | } | |
1670 | ||
b3b94faa DT |
1671 | static int setattr_chown(struct inode *inode, struct iattr *attr) |
1672 | { | |
feaa7bba SW |
1673 | struct gfs2_inode *ip = GFS2_I(inode); |
1674 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
7c06b5d6 EB |
1675 | kuid_t ouid, nuid; |
1676 | kgid_t ogid, ngid; | |
b3b94faa DT |
1677 | int error; |
1678 | ||
2933f925 SW |
1679 | ouid = inode->i_uid; |
1680 | ogid = inode->i_gid; | |
b3b94faa DT |
1681 | nuid = attr->ia_uid; |
1682 | ngid = attr->ia_gid; | |
1683 | ||
6b24c0d2 | 1684 | if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) |
f4108a60 | 1685 | ouid = nuid = NO_UID_QUOTA_CHANGE; |
6b24c0d2 | 1686 | if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) |
f4108a60 | 1687 | ogid = ngid = NO_GID_QUOTA_CHANGE; |
b3b94faa | 1688 | |
62e96cf8 | 1689 | error = get_write_access(inode); |
b3b94faa | 1690 | if (error) |
5407e242 | 1691 | return error; |
b3b94faa | 1692 | |
62e96cf8 BP |
1693 | error = gfs2_rs_alloc(ip); |
1694 | if (error) | |
1695 | goto out; | |
1696 | ||
1697 | error = gfs2_rindex_update(sdp); | |
1698 | if (error) | |
1699 | goto out; | |
1700 | ||
1701 | error = gfs2_quota_lock(ip, nuid, ngid); | |
1702 | if (error) | |
1703 | goto out; | |
1704 | ||
6b24c0d2 EB |
1705 | if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || |
1706 | !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { | |
b3b94faa DT |
1707 | error = gfs2_quota_check(ip, nuid, ngid); |
1708 | if (error) | |
1709 | goto out_gunlock_q; | |
1710 | } | |
1711 | ||
1712 | error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); | |
1713 | if (error) | |
1714 | goto out_gunlock_q; | |
1715 | ||
ab9bbda0 | 1716 | error = gfs2_setattr_simple(inode, attr); |
b3b94faa DT |
1717 | if (error) |
1718 | goto out_end_trans; | |
1719 | ||
6b24c0d2 EB |
1720 | if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || |
1721 | !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { | |
77658aad SW |
1722 | u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); |
1723 | gfs2_quota_change(ip, -blocks, ouid, ogid); | |
1724 | gfs2_quota_change(ip, blocks, nuid, ngid); | |
b3b94faa DT |
1725 | } |
1726 | ||
a91ea69f | 1727 | out_end_trans: |
b3b94faa | 1728 | gfs2_trans_end(sdp); |
a91ea69f | 1729 | out_gunlock_q: |
b3b94faa | 1730 | gfs2_quota_unlock(ip); |
62e96cf8 BP |
1731 | out: |
1732 | put_write_access(inode); | |
b3b94faa DT |
1733 | return error; |
1734 | } | |
1735 | ||
1736 | /** | |
1737 | * gfs2_setattr - Change attributes on an inode | |
1738 | * @dentry: The dentry which is changing | |
1739 | * @attr: The structure describing the change | |
1740 | * | |
1741 | * The VFS layer wants to change one or more of an inodes attributes. Write | |
1742 | * that change out to disk. | |
1743 | * | |
1744 | * Returns: errno | |
1745 | */ | |
1746 | ||
1747 | static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) | |
1748 | { | |
1749 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1750 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1751 | struct gfs2_holder i_gh; |
1752 | int error; | |
1753 | ||
0a305e49 BP |
1754 | error = gfs2_rs_alloc(ip); |
1755 | if (error) | |
1756 | return error; | |
1757 | ||
b3b94faa DT |
1758 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); |
1759 | if (error) | |
1760 | return error; | |
1761 | ||
1762 | error = -EPERM; | |
1763 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
1764 | goto out; | |
1765 | ||
1766 | error = inode_change_ok(inode, attr); | |
1767 | if (error) | |
1768 | goto out; | |
1769 | ||
1770 | if (attr->ia_valid & ATTR_SIZE) | |
ff8f33c8 | 1771 | error = gfs2_setattr_size(inode, attr->ia_size); |
b3b94faa DT |
1772 | else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) |
1773 | error = setattr_chown(inode, attr); | |
e01580bf | 1774 | else { |
ab9bbda0 | 1775 | error = gfs2_setattr_simple(inode, attr); |
e01580bf CH |
1776 | if (!error && attr->ia_valid & ATTR_MODE) |
1777 | error = posix_acl_chmod(inode, inode->i_mode); | |
1778 | } | |
b3b94faa | 1779 | |
a91ea69f | 1780 | out: |
b3b94faa DT |
1781 | if (!error) |
1782 | mark_inode_dirty(inode); | |
ab9bbda0 | 1783 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1784 | return error; |
1785 | } | |
1786 | ||
1787 | /** | |
1788 | * gfs2_getattr - Read out an inode's attributes | |
26c1a574 | 1789 | * @mnt: The vfsmount the inode is being accessed from |
b3b94faa DT |
1790 | * @dentry: The dentry to stat |
1791 | * @stat: The inode's stats | |
1792 | * | |
dcf3dd85 SW |
1793 | * This may be called from the VFS directly, or from within GFS2 with the |
1794 | * inode locked, so we look to see if the glock is already locked and only | |
1795 | * lock the glock if its not already been done. Note that its the NFS | |
1796 | * readdirplus operation which causes this to be called (from filldir) | |
1797 | * with the glock already held. | |
1798 | * | |
b3b94faa DT |
1799 | * Returns: errno |
1800 | */ | |
1801 | ||
1802 | static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
1803 | struct kstat *stat) | |
1804 | { | |
1805 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1806 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1807 | struct gfs2_holder gh; |
1808 | int error; | |
dcf3dd85 | 1809 | int unlock = 0; |
b3b94faa | 1810 | |
7afd88d9 | 1811 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
dcf3dd85 SW |
1812 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1813 | if (error) | |
1814 | return error; | |
1815 | unlock = 1; | |
b3b94faa DT |
1816 | } |
1817 | ||
dcf3dd85 | 1818 | generic_fillattr(inode, stat); |
d7c103d0 | 1819 | if (unlock) |
dcf3dd85 SW |
1820 | gfs2_glock_dq_uninit(&gh); |
1821 | ||
1822 | return 0; | |
b3b94faa DT |
1823 | } |
1824 | ||
1825 | static int gfs2_setxattr(struct dentry *dentry, const char *name, | |
1826 | const void *data, size_t size, int flags) | |
1827 | { | |
feaa7bba | 1828 | struct inode *inode = dentry->d_inode; |
40b78a32 SW |
1829 | struct gfs2_inode *ip = GFS2_I(inode); |
1830 | struct gfs2_holder gh; | |
1831 | int ret; | |
b3b94faa | 1832 | |
40b78a32 SW |
1833 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
1834 | ret = gfs2_glock_nq(&gh); | |
1835 | if (ret == 0) { | |
645b2ccc SW |
1836 | ret = gfs2_rs_alloc(ip); |
1837 | if (ret == 0) | |
1838 | ret = generic_setxattr(dentry, name, data, size, flags); | |
40b78a32 SW |
1839 | gfs2_glock_dq(&gh); |
1840 | } | |
1841 | gfs2_holder_uninit(&gh); | |
1842 | return ret; | |
b3b94faa DT |
1843 | } |
1844 | ||
1845 | static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, | |
1846 | void *data, size_t size) | |
1847 | { | |
40b78a32 SW |
1848 | struct inode *inode = dentry->d_inode; |
1849 | struct gfs2_inode *ip = GFS2_I(inode); | |
1850 | struct gfs2_holder gh; | |
1851 | int ret; | |
b3b94faa | 1852 | |
7bd9ee58 SW |
1853 | /* For selinux during lookup */ |
1854 | if (gfs2_glock_is_locked_by_me(ip->i_gl)) | |
1855 | return generic_getxattr(dentry, name, data, size); | |
1856 | ||
40b78a32 SW |
1857 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1858 | ret = gfs2_glock_nq(&gh); | |
1859 | if (ret == 0) { | |
1860 | ret = generic_getxattr(dentry, name, data, size); | |
1861 | gfs2_glock_dq(&gh); | |
1862 | } | |
1863 | gfs2_holder_uninit(&gh); | |
1864 | return ret; | |
b3b94faa DT |
1865 | } |
1866 | ||
1867 | static int gfs2_removexattr(struct dentry *dentry, const char *name) | |
1868 | { | |
40b78a32 SW |
1869 | struct inode *inode = dentry->d_inode; |
1870 | struct gfs2_inode *ip = GFS2_I(inode); | |
1871 | struct gfs2_holder gh; | |
1872 | int ret; | |
b3b94faa | 1873 | |
40b78a32 SW |
1874 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
1875 | ret = gfs2_glock_nq(&gh); | |
1876 | if (ret == 0) { | |
645b2ccc SW |
1877 | ret = gfs2_rs_alloc(ip); |
1878 | if (ret == 0) | |
1879 | ret = generic_removexattr(dentry, name); | |
40b78a32 SW |
1880 | gfs2_glock_dq(&gh); |
1881 | } | |
1882 | gfs2_holder_uninit(&gh); | |
1883 | return ret; | |
b3b94faa DT |
1884 | } |
1885 | ||
e9079cce SW |
1886 | static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
1887 | u64 start, u64 len) | |
1888 | { | |
1889 | struct gfs2_inode *ip = GFS2_I(inode); | |
1890 | struct gfs2_holder gh; | |
1891 | int ret; | |
1892 | ||
1893 | ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); | |
1894 | if (ret) | |
1895 | return ret; | |
1896 | ||
1897 | mutex_lock(&inode->i_mutex); | |
1898 | ||
1899 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); | |
1900 | if (ret) | |
1901 | goto out; | |
1902 | ||
1903 | if (gfs2_is_stuffed(ip)) { | |
1904 | u64 phys = ip->i_no_addr << inode->i_blkbits; | |
1905 | u64 size = i_size_read(inode); | |
1906 | u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| | |
1907 | FIEMAP_EXTENT_DATA_INLINE; | |
1908 | phys += sizeof(struct gfs2_dinode); | |
1909 | phys += start; | |
1910 | if (start + len > size) | |
1911 | len = size - start; | |
1912 | if (start < size) | |
1913 | ret = fiemap_fill_next_extent(fieinfo, start, phys, | |
1914 | len, flags); | |
1915 | if (ret == 1) | |
1916 | ret = 0; | |
1917 | } else { | |
1918 | ret = __generic_block_fiemap(inode, fieinfo, start, len, | |
1919 | gfs2_block_map); | |
1920 | } | |
1921 | ||
1922 | gfs2_glock_dq_uninit(&gh); | |
1923 | out: | |
1924 | mutex_unlock(&inode->i_mutex); | |
1925 | return ret; | |
1926 | } | |
1927 | ||
92e1d5be | 1928 | const struct inode_operations gfs2_file_iops = { |
e6305c43 | 1929 | .permission = gfs2_permission, |
b3b94faa DT |
1930 | .setattr = gfs2_setattr, |
1931 | .getattr = gfs2_getattr, | |
1932 | .setxattr = gfs2_setxattr, | |
1933 | .getxattr = gfs2_getxattr, | |
1934 | .listxattr = gfs2_listxattr, | |
1935 | .removexattr = gfs2_removexattr, | |
e9079cce | 1936 | .fiemap = gfs2_fiemap, |
4e34e719 | 1937 | .get_acl = gfs2_get_acl, |
e01580bf | 1938 | .set_acl = gfs2_set_acl, |
b3b94faa DT |
1939 | }; |
1940 | ||
92e1d5be | 1941 | const struct inode_operations gfs2_dir_iops = { |
b3b94faa DT |
1942 | .create = gfs2_create, |
1943 | .lookup = gfs2_lookup, | |
1944 | .link = gfs2_link, | |
1945 | .unlink = gfs2_unlink, | |
1946 | .symlink = gfs2_symlink, | |
1947 | .mkdir = gfs2_mkdir, | |
855d23ce | 1948 | .rmdir = gfs2_unlink, |
b3b94faa DT |
1949 | .mknod = gfs2_mknod, |
1950 | .rename = gfs2_rename, | |
e6305c43 | 1951 | .permission = gfs2_permission, |
b3b94faa DT |
1952 | .setattr = gfs2_setattr, |
1953 | .getattr = gfs2_getattr, | |
1954 | .setxattr = gfs2_setxattr, | |
1955 | .getxattr = gfs2_getxattr, | |
1956 | .listxattr = gfs2_listxattr, | |
1957 | .removexattr = gfs2_removexattr, | |
e9079cce | 1958 | .fiemap = gfs2_fiemap, |
4e34e719 | 1959 | .get_acl = gfs2_get_acl, |
e01580bf | 1960 | .set_acl = gfs2_set_acl, |
6d4ade98 | 1961 | .atomic_open = gfs2_atomic_open, |
b3b94faa DT |
1962 | }; |
1963 | ||
92e1d5be | 1964 | const struct inode_operations gfs2_symlink_iops = { |
c177c2ac | 1965 | .readlink = generic_readlink, |
b3b94faa | 1966 | .follow_link = gfs2_follow_link, |
87dc800b | 1967 | .put_link = kfree_put_link, |
e6305c43 | 1968 | .permission = gfs2_permission, |
b3b94faa DT |
1969 | .setattr = gfs2_setattr, |
1970 | .getattr = gfs2_getattr, | |
1971 | .setxattr = gfs2_setxattr, | |
1972 | .getxattr = gfs2_getxattr, | |
1973 | .listxattr = gfs2_listxattr, | |
1974 | .removexattr = gfs2_removexattr, | |
e9079cce | 1975 | .fiemap = gfs2_fiemap, |
b3b94faa DT |
1976 | }; |
1977 |