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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) | |
152 | return ERR_PTR(-ENOBUFS); | |
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: | |
192 | ip->i_iopen_gh.gh_gl->gl_object = NULL; | |
193 | gfs2_glock_dq_uninit(&ip->i_iopen_gh); | |
194 | fail_iopen: | |
195 | if (io_gl) | |
196 | gfs2_glock_put(io_gl); | |
197 | fail_put: | |
198 | ip->i_gl->gl_object = NULL; | |
199 | gfs2_glock_put(ip->i_gl); | |
200 | fail: | |
201 | iget_failed(inode); | |
202 | return ERR_PTR(error); | |
203 | } | |
204 | ||
205 | struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, | |
206 | u64 *no_formal_ino, unsigned int blktype) | |
207 | { | |
208 | struct super_block *sb = sdp->sd_vfs; | |
209 | struct gfs2_holder i_gh; | |
210 | struct inode *inode = NULL; | |
211 | int error; | |
212 | ||
213 | /* Must not read in block until block type is verified */ | |
214 | error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops, | |
215 | LM_ST_EXCLUSIVE, GL_SKIP, &i_gh); | |
216 | if (error) | |
217 | return ERR_PTR(error); | |
218 | ||
219 | error = gfs2_check_blk_type(sdp, no_addr, blktype); | |
220 | if (error) | |
221 | goto fail; | |
222 | ||
223 | inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1); | |
224 | if (IS_ERR(inode)) | |
225 | goto fail; | |
226 | ||
227 | /* Two extra checks for NFS only */ | |
228 | if (no_formal_ino) { | |
229 | error = -ESTALE; | |
230 | if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino) | |
231 | goto fail_iput; | |
232 | ||
233 | error = -EIO; | |
234 | if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) | |
235 | goto fail_iput; | |
236 | ||
237 | error = 0; | |
238 | } | |
239 | ||
240 | fail: | |
241 | gfs2_glock_dq_uninit(&i_gh); | |
242 | return error ? ERR_PTR(error) : inode; | |
243 | fail_iput: | |
244 | iput(inode); | |
245 | goto fail; | |
246 | } | |
247 | ||
248 | ||
249 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) | |
250 | { | |
251 | struct qstr qstr; | |
252 | struct inode *inode; | |
253 | gfs2_str2qstr(&qstr, name); | |
254 | inode = gfs2_lookupi(dip, &qstr, 1); | |
255 | /* gfs2_lookupi has inconsistent callers: vfs | |
256 | * related routines expect NULL for no entry found, | |
257 | * gfs2_lookup_simple callers expect ENOENT | |
258 | * and do not check for NULL. | |
259 | */ | |
260 | if (inode == NULL) | |
261 | return ERR_PTR(-ENOENT); | |
262 | else | |
263 | return inode; | |
264 | } | |
265 | ||
266 | ||
267 | /** | |
268 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
269 | * @d_gh: An initialized holder for the directory glock | |
270 | * @name: The name of the inode to look for | |
271 | * @is_root: If 1, ignore the caller's permissions | |
272 | * @i_gh: An uninitialized holder for the new inode glock | |
273 | * | |
274 | * This can be called via the VFS filldir function when NFS is doing | |
275 | * a readdirplus and the inode which its intending to stat isn't | |
276 | * already in cache. In this case we must not take the directory glock | |
277 | * again, since the readdir call will have already taken that lock. | |
278 | * | |
279 | * Returns: errno | |
280 | */ | |
281 | ||
282 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, | |
283 | int is_root) | |
284 | { | |
285 | struct super_block *sb = dir->i_sb; | |
286 | struct gfs2_inode *dip = GFS2_I(dir); | |
287 | struct gfs2_holder d_gh; | |
288 | int error = 0; | |
289 | struct inode *inode = NULL; | |
290 | int unlock = 0; | |
291 | ||
292 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
293 | return ERR_PTR(-ENAMETOOLONG); | |
294 | ||
295 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || | |
296 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
297 | dir == sb->s_root->d_inode)) { | |
298 | igrab(dir); | |
299 | return dir; | |
300 | } | |
301 | ||
302 | if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { | |
303 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
304 | if (error) | |
305 | return ERR_PTR(error); | |
306 | unlock = 1; | |
307 | } | |
308 | ||
309 | if (!is_root) { | |
10556cb2 | 310 | error = gfs2_permission(dir, MAY_EXEC); |
194c011f SW |
311 | if (error) |
312 | goto out; | |
313 | } | |
314 | ||
315 | inode = gfs2_dir_search(dir, name); | |
316 | if (IS_ERR(inode)) | |
317 | error = PTR_ERR(inode); | |
318 | out: | |
319 | if (unlock) | |
320 | gfs2_glock_dq_uninit(&d_gh); | |
321 | if (error == -ENOENT) | |
322 | return NULL; | |
323 | return inode ? inode : ERR_PTR(error); | |
324 | } | |
325 | ||
326 | /** | |
327 | * create_ok - OK to create a new on-disk inode here? | |
328 | * @dip: Directory in which dinode is to be created | |
329 | * @name: Name of new dinode | |
330 | * @mode: | |
331 | * | |
332 | * Returns: errno | |
333 | */ | |
334 | ||
335 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, | |
175a4eb7 | 336 | umode_t mode) |
194c011f SW |
337 | { |
338 | int error; | |
339 | ||
10556cb2 | 340 | error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); |
194c011f SW |
341 | if (error) |
342 | return error; | |
343 | ||
344 | /* Don't create entries in an unlinked directory */ | |
345 | if (!dip->i_inode.i_nlink) | |
346 | return -ENOENT; | |
347 | ||
348 | error = gfs2_dir_check(&dip->i_inode, name, NULL); | |
349 | switch (error) { | |
350 | case -ENOENT: | |
351 | error = 0; | |
352 | break; | |
353 | case 0: | |
354 | return -EEXIST; | |
355 | default: | |
356 | return error; | |
357 | } | |
358 | ||
359 | if (dip->i_entries == (u32)-1) | |
360 | return -EFBIG; | |
361 | if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) | |
362 | return -EMLINK; | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
c9aecf73 SW |
367 | static void munge_mode_uid_gid(const struct gfs2_inode *dip, |
368 | struct inode *inode) | |
194c011f SW |
369 | { |
370 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && | |
6b24c0d2 EB |
371 | (dip->i_inode.i_mode & S_ISUID) && |
372 | !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { | |
c9aecf73 SW |
373 | if (S_ISDIR(inode->i_mode)) |
374 | inode->i_mode |= S_ISUID; | |
6b24c0d2 | 375 | else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) |
c9aecf73 SW |
376 | inode->i_mode &= ~07111; |
377 | inode->i_uid = dip->i_inode.i_uid; | |
194c011f | 378 | } else |
c9aecf73 | 379 | inode->i_uid = current_fsuid(); |
194c011f SW |
380 | |
381 | if (dip->i_inode.i_mode & S_ISGID) { | |
c9aecf73 SW |
382 | if (S_ISDIR(inode->i_mode)) |
383 | inode->i_mode |= S_ISGID; | |
384 | inode->i_gid = dip->i_inode.i_gid; | |
194c011f | 385 | } else |
c9aecf73 | 386 | inode->i_gid = current_fsgid(); |
194c011f SW |
387 | } |
388 | ||
9dbe9610 | 389 | static int alloc_dinode(struct gfs2_inode *ip, u32 flags) |
194c011f | 390 | { |
c9aecf73 | 391 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
194c011f | 392 | int error; |
6a8099ed | 393 | int dblocks = 1; |
194c011f | 394 | |
fd4b4e04 | 395 | error = gfs2_quota_lock_check(ip); |
194c011f SW |
396 | if (error) |
397 | goto out; | |
398 | ||
fd4b4e04 SW |
399 | error = gfs2_inplace_reserve(ip, RES_DINODE, flags); |
400 | if (error) | |
401 | goto out_quota; | |
402 | ||
403 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 0); | |
194c011f SW |
404 | if (error) |
405 | goto out_ipreserv; | |
406 | ||
c9aecf73 SW |
407 | error = gfs2_alloc_blocks(ip, &ip->i_no_addr, &dblocks, 1, &ip->i_generation); |
408 | ip->i_no_formal_ino = ip->i_generation; | |
409 | ip->i_inode.i_ino = ip->i_no_addr; | |
410 | ip->i_goal = ip->i_no_addr; | |
194c011f SW |
411 | |
412 | gfs2_trans_end(sdp); | |
413 | ||
414 | out_ipreserv: | |
c9aecf73 | 415 | gfs2_inplace_release(ip); |
fd4b4e04 SW |
416 | out_quota: |
417 | gfs2_quota_unlock(ip); | |
194c011f | 418 | out: |
194c011f SW |
419 | return error; |
420 | } | |
421 | ||
f2741d98 SW |
422 | static void gfs2_init_dir(struct buffer_head *dibh, |
423 | const struct gfs2_inode *parent) | |
e2d0a13b SW |
424 | { |
425 | struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; | |
426 | struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); | |
427 | ||
428 | gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); | |
429 | dent->de_inum = di->di_num; /* already GFS2 endian */ | |
430 | dent->de_type = cpu_to_be16(DT_DIR); | |
431 | ||
432 | dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); | |
433 | gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); | |
434 | gfs2_inum_out(parent, dent); | |
435 | dent->de_type = cpu_to_be16(DT_DIR); | |
436 | ||
437 | } | |
438 | ||
194c011f SW |
439 | /** |
440 | * init_dinode - Fill in a new dinode structure | |
f2741d98 | 441 | * @dip: The directory this inode is being created in |
c9aecf73 | 442 | * @ip: The inode |
f2741d98 | 443 | * @symname: The symlink destination (if a symlink) |
f2741d98 | 444 | * @bhp: The buffer head (returned to caller) |
194c011f SW |
445 | * |
446 | */ | |
447 | ||
c9aecf73 SW |
448 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, |
449 | const char *symname, struct buffer_head **bhp) | |
194c011f SW |
450 | { |
451 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
452 | struct gfs2_dinode *di; | |
453 | struct buffer_head *dibh; | |
194c011f | 454 | |
c9aecf73 | 455 | dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); |
350a9b0a | 456 | gfs2_trans_add_meta(ip->i_gl, dibh); |
194c011f SW |
457 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
458 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
459 | di = (struct gfs2_dinode *)dibh->b_data; | |
460 | ||
c9aecf73 SW |
461 | di->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino); |
462 | di->di_num.no_addr = cpu_to_be64(ip->i_no_addr); | |
463 | di->di_mode = cpu_to_be32(ip->i_inode.i_mode); | |
d0546426 EB |
464 | di->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode)); |
465 | di->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode)); | |
194c011f | 466 | di->di_nlink = 0; |
c9aecf73 | 467 | di->di_size = cpu_to_be64(ip->i_inode.i_size); |
194c011f | 468 | di->di_blocks = cpu_to_be64(1); |
fd4b4e04 SW |
469 | di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); |
470 | di->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec); | |
471 | di->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec); | |
c9aecf73 SW |
472 | di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev)); |
473 | di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); | |
474 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(ip->i_no_addr); | |
475 | di->di_generation = cpu_to_be64(ip->i_generation); | |
194c011f | 476 | di->di_flags = 0; |
194c011f | 477 | di->__pad1 = 0; |
c9aecf73 | 478 | di->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) ? GFS2_FORMAT_DE : 0); |
194c011f SW |
479 | di->di_height = 0; |
480 | di->__pad2 = 0; | |
481 | di->__pad3 = 0; | |
482 | di->di_depth = 0; | |
483 | di->di_entries = 0; | |
484 | memset(&di->__pad4, 0, sizeof(di->__pad4)); | |
485 | di->di_eattr = 0; | |
fd4b4e04 SW |
486 | di->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec); |
487 | di->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec); | |
488 | di->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec); | |
194c011f | 489 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); |
160b4026 | 490 | |
c9aecf73 | 491 | switch(ip->i_inode.i_mode & S_IFMT) { |
160b4026 | 492 | case S_IFREG: |
e2d0a13b SW |
493 | if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || |
494 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
495 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); | |
160b4026 SW |
496 | break; |
497 | case S_IFDIR: | |
e2d0a13b SW |
498 | di->di_flags |= cpu_to_be32(dip->i_diskflags & |
499 | GFS2_DIF_INHERIT_JDATA); | |
500 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); | |
501 | di->di_size = cpu_to_be64(sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)); | |
502 | di->di_entries = cpu_to_be32(2); | |
503 | gfs2_init_dir(dibh, dip); | |
160b4026 SW |
504 | break; |
505 | case S_IFLNK: | |
c9aecf73 | 506 | memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); |
160b4026 | 507 | break; |
e2d0a13b SW |
508 | } |
509 | ||
194c011f SW |
510 | set_buffer_uptodate(dibh); |
511 | ||
512 | *bhp = dibh; | |
513 | } | |
514 | ||
194c011f | 515 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
fd4b4e04 | 516 | struct gfs2_inode *ip, int arq) |
194c011f SW |
517 | { |
518 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
194c011f SW |
519 | struct buffer_head *dibh; |
520 | int error; | |
521 | ||
f4108a60 | 522 | error = gfs2_quota_lock(dip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE); |
194c011f | 523 | if (error) |
fd4b4e04 | 524 | return error; |
194c011f | 525 | |
fd4b4e04 | 526 | if (arq) { |
194c011f SW |
527 | error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); |
528 | if (error) | |
529 | goto fail_quota_locks; | |
530 | ||
9dbe9610 | 531 | error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0); |
194c011f SW |
532 | if (error) |
533 | goto fail_quota_locks; | |
534 | ||
535 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + | |
54335b1f | 536 | dip->i_rgd->rd_length + |
194c011f SW |
537 | 2 * RES_DINODE + |
538 | RES_STATFS + RES_QUOTA, 0); | |
539 | if (error) | |
540 | goto fail_ipreserv; | |
541 | } else { | |
542 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); | |
543 | if (error) | |
544 | goto fail_quota_locks; | |
545 | } | |
546 | ||
547 | error = gfs2_dir_add(&dip->i_inode, name, ip); | |
548 | if (error) | |
549 | goto fail_end_trans; | |
550 | ||
551 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
552 | if (error) | |
553 | goto fail_end_trans; | |
66ad863b | 554 | set_nlink(&ip->i_inode, S_ISDIR(ip->i_inode.i_mode) ? 2 : 1); |
350a9b0a | 555 | gfs2_trans_add_meta(ip->i_gl, dibh); |
194c011f SW |
556 | gfs2_dinode_out(ip, dibh->b_data); |
557 | brelse(dibh); | |
558 | return 0; | |
559 | ||
560 | fail_end_trans: | |
561 | gfs2_trans_end(sdp); | |
194c011f | 562 | fail_ipreserv: |
fd4b4e04 | 563 | gfs2_inplace_release(dip); |
194c011f SW |
564 | fail_quota_locks: |
565 | gfs2_quota_unlock(dip); | |
194c011f SW |
566 | return error; |
567 | } | |
568 | ||
46cc1e5f | 569 | static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, |
9d8f13ba | 570 | void *fs_info) |
194c011f | 571 | { |
9d8f13ba MZ |
572 | const struct xattr *xattr; |
573 | int err = 0; | |
574 | ||
575 | for (xattr = xattr_array; xattr->name != NULL; xattr++) { | |
576 | err = __gfs2_xattr_set(inode, xattr->name, xattr->value, | |
577 | xattr->value_len, 0, | |
578 | GFS2_EATYPE_SECURITY); | |
579 | if (err < 0) | |
580 | break; | |
194c011f | 581 | } |
194c011f SW |
582 | return err; |
583 | } | |
b3b94faa | 584 | |
9d8f13ba MZ |
585 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, |
586 | const struct qstr *qstr) | |
587 | { | |
588 | return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, | |
589 | &gfs2_initxattrs, NULL); | |
590 | } | |
591 | ||
194c011f | 592 | /** |
f2741d98 SW |
593 | * gfs2_create_inode - Create a new inode |
594 | * @dir: The parent directory | |
595 | * @dentry: The new dentry | |
596 | * @mode: The permissions on the new inode | |
597 | * @dev: For device nodes, this is the device number | |
598 | * @symname: For symlinks, this is the link destination | |
599 | * @size: The initial size of the inode (ignored for directories) | |
194c011f | 600 | * |
f2741d98 | 601 | * Returns: 0 on success, or error code |
194c011f SW |
602 | */ |
603 | ||
f2741d98 | 604 | static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, |
175a4eb7 | 605 | umode_t mode, dev_t dev, const char *symname, |
9a63edd1 | 606 | unsigned int size, int excl) |
194c011f | 607 | { |
f2741d98 SW |
608 | const struct qstr *name = &dentry->d_name; |
609 | struct gfs2_holder ghs[2]; | |
194c011f | 610 | struct inode *inode = NULL; |
8e2e0047 | 611 | struct gfs2_inode *dip = GFS2_I(dir), *ip; |
194c011f | 612 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
c9aecf73 | 613 | struct gfs2_glock *io_gl; |
194c011f | 614 | int error; |
194c011f | 615 | struct buffer_head *bh = NULL; |
9dbe9610 | 616 | u32 aflags = 0; |
fd4b4e04 | 617 | int arq; |
194c011f SW |
618 | |
619 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
f2741d98 | 620 | return -ENAMETOOLONG; |
194c011f | 621 | |
0a305e49 BP |
622 | error = gfs2_rs_alloc(dip); |
623 | if (error) | |
624 | return error; | |
625 | ||
fd4b4e04 SW |
626 | error = gfs2_rindex_update(sdp); |
627 | if (error) | |
628 | return error; | |
629 | ||
f2741d98 | 630 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
194c011f SW |
631 | if (error) |
632 | goto fail; | |
633 | ||
634 | error = create_ok(dip, name, mode); | |
9a63edd1 SW |
635 | if ((error == -EEXIST) && S_ISREG(mode) && !excl) { |
636 | inode = gfs2_lookupi(dir, &dentry->d_name, 0); | |
637 | gfs2_glock_dq_uninit(ghs); | |
638 | d_instantiate(dentry, inode); | |
639 | return IS_ERR(inode) ? PTR_ERR(inode) : 0; | |
640 | } | |
194c011f SW |
641 | if (error) |
642 | goto fail_gunlock; | |
643 | ||
fd4b4e04 SW |
644 | arq = error = gfs2_diradd_alloc_required(dir, name); |
645 | if (error < 0) | |
646 | goto fail_gunlock; | |
647 | ||
c9aecf73 | 648 | inode = new_inode(sdp->sd_vfs); |
fd4b4e04 SW |
649 | error = -ENOMEM; |
650 | if (!inode) | |
651 | goto fail_gunlock; | |
652 | ||
c9aecf73 SW |
653 | ip = GFS2_I(inode); |
654 | error = gfs2_rs_alloc(ip); | |
194c011f | 655 | if (error) |
c9aecf73 SW |
656 | goto fail_free_inode; |
657 | ||
658 | set_bit(GIF_INVALID, &ip->i_flags); | |
659 | inode->i_mode = mode; | |
660 | inode->i_rdev = dev; | |
661 | inode->i_size = size; | |
fd4b4e04 | 662 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
c9aecf73 SW |
663 | munge_mode_uid_gid(dip, inode); |
664 | ip->i_goal = dip->i_goal; | |
194c011f | 665 | |
9dbe9610 SW |
666 | if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || |
667 | (dip->i_diskflags & GFS2_DIF_TOPDIR)) | |
668 | aflags |= GFS2_AF_ORLOV; | |
669 | ||
670 | error = alloc_dinode(ip, aflags); | |
194c011f | 671 | if (error) |
c9aecf73 | 672 | goto fail_free_inode; |
194c011f | 673 | |
c9aecf73 | 674 | error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
194c011f | 675 | if (error) |
c9aecf73 | 676 | goto fail_free_inode; |
194c011f | 677 | |
1e2d9d44 | 678 | ip->i_gl->gl_object = ip; |
c9aecf73 SW |
679 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); |
680 | if (error) | |
681 | goto fail_free_inode; | |
682 | ||
fd4b4e04 | 683 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
c9aecf73 | 684 | if (error) |
194c011f SW |
685 | goto fail_gunlock2; |
686 | ||
fd4b4e04 SW |
687 | init_dinode(dip, ip, symname, &bh); |
688 | gfs2_trans_end(sdp); | |
689 | ||
c9aecf73 | 690 | error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
194c011f SW |
691 | if (error) |
692 | goto fail_gunlock2; | |
693 | ||
c9aecf73 | 694 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); |
ff7f4cb4 SW |
695 | if (error) |
696 | goto fail_gunlock2; | |
0a305e49 | 697 | |
c9aecf73 SW |
698 | ip->i_iopen_gh.gh_gl->gl_object = ip; |
699 | gfs2_glock_put(io_gl); | |
700 | gfs2_set_iop(inode); | |
701 | insert_inode_hash(inode); | |
702 | ||
703 | error = gfs2_inode_refresh(ip); | |
704 | if (error) | |
705 | goto fail_gunlock3; | |
706 | ||
194c011f SW |
707 | error = gfs2_acl_create(dip, inode); |
708 | if (error) | |
c9aecf73 | 709 | goto fail_gunlock3; |
194c011f | 710 | |
8e2e0047 | 711 | error = gfs2_security_init(dip, ip, name); |
194c011f | 712 | if (error) |
c9aecf73 | 713 | goto fail_gunlock3; |
194c011f | 714 | |
fd4b4e04 | 715 | error = link_dinode(dip, name, ip, arq); |
194c011f | 716 | if (error) |
c9aecf73 | 717 | goto fail_gunlock3; |
194c011f SW |
718 | |
719 | if (bh) | |
720 | brelse(bh); | |
f2741d98 SW |
721 | |
722 | gfs2_trans_end(sdp); | |
71f890f7 | 723 | gfs2_inplace_release(dip); |
f2741d98 | 724 | gfs2_quota_unlock(dip); |
f2741d98 | 725 | mark_inode_dirty(inode); |
ab9bbda0 | 726 | gfs2_glock_dq_uninit_m(2, ghs); |
f2741d98 SW |
727 | d_instantiate(dentry, inode); |
728 | return 0; | |
194c011f | 729 | |
c9aecf73 SW |
730 | fail_gunlock3: |
731 | gfs2_glock_dq_uninit(ghs + 1); | |
732 | if (ip->i_gl) | |
733 | gfs2_glock_put(ip->i_gl); | |
734 | goto fail_gunlock; | |
735 | ||
194c011f SW |
736 | fail_gunlock2: |
737 | gfs2_glock_dq_uninit(ghs + 1); | |
c9aecf73 SW |
738 | fail_free_inode: |
739 | if (ip->i_gl) | |
740 | gfs2_glock_put(ip->i_gl); | |
741 | gfs2_rs_delete(ip); | |
742 | free_inode_nonrcu(inode); | |
743 | inode = NULL; | |
194c011f | 744 | fail_gunlock: |
f2741d98 | 745 | gfs2_glock_dq_uninit(ghs); |
40ac218f SW |
746 | if (inode && !IS_ERR(inode)) { |
747 | set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags); | |
748 | iput(inode); | |
749 | } | |
194c011f SW |
750 | fail: |
751 | if (bh) | |
752 | brelse(bh); | |
f2741d98 | 753 | return error; |
194c011f | 754 | } |
f2741d98 | 755 | |
b3b94faa DT |
756 | /** |
757 | * gfs2_create - Create a file | |
758 | * @dir: The directory in which to create the file | |
759 | * @dentry: The dentry of the new file | |
760 | * @mode: The mode of the new file | |
761 | * | |
762 | * Returns: errno | |
763 | */ | |
764 | ||
765 | static int gfs2_create(struct inode *dir, struct dentry *dentry, | |
ebfc3b49 | 766 | umode_t mode, bool excl) |
b3b94faa | 767 | { |
9a63edd1 | 768 | return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl); |
b3b94faa DT |
769 | } |
770 | ||
771 | /** | |
772 | * gfs2_lookup - Look up a filename in a directory and return its inode | |
773 | * @dir: The directory inode | |
774 | * @dentry: The dentry of the new inode | |
775 | * @nd: passed from Linux VFS, ignored by us | |
776 | * | |
777 | * Called by the VFS layer. Lock dir and call gfs2_lookupi() | |
778 | * | |
779 | * Returns: errno | |
780 | */ | |
781 | ||
782 | static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, | |
00cd8dd3 | 783 | unsigned int flags) |
b3b94faa | 784 | { |
6c673ab3 AV |
785 | struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0); |
786 | if (inode && !IS_ERR(inode)) { | |
9656b2c1 SW |
787 | struct gfs2_glock *gl = GFS2_I(inode)->i_gl; |
788 | struct gfs2_holder gh; | |
789 | int error; | |
790 | error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); | |
791 | if (error) { | |
792 | iput(inode); | |
793 | return ERR_PTR(error); | |
794 | } | |
795 | gfs2_glock_dq_uninit(&gh); | |
9656b2c1 | 796 | } |
6c673ab3 | 797 | return d_splice_alias(inode, dentry); |
b3b94faa DT |
798 | } |
799 | ||
800 | /** | |
801 | * gfs2_link - Link to a file | |
802 | * @old_dentry: The inode to link | |
803 | * @dir: Add link to this directory | |
804 | * @dentry: The name of the link | |
805 | * | |
806 | * Link the inode in "old_dentry" into the directory "dir" with the | |
807 | * name in "dentry". | |
808 | * | |
809 | * Returns: errno | |
810 | */ | |
811 | ||
812 | static int gfs2_link(struct dentry *old_dentry, struct inode *dir, | |
813 | struct dentry *dentry) | |
814 | { | |
feaa7bba SW |
815 | struct gfs2_inode *dip = GFS2_I(dir); |
816 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa | 817 | struct inode *inode = old_dentry->d_inode; |
feaa7bba | 818 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 819 | struct gfs2_holder ghs[2]; |
2baee03f | 820 | struct buffer_head *dibh; |
b3b94faa DT |
821 | int alloc_required; |
822 | int error; | |
823 | ||
b60623c2 | 824 | if (S_ISDIR(inode->i_mode)) |
b3b94faa DT |
825 | return -EPERM; |
826 | ||
0a305e49 BP |
827 | error = gfs2_rs_alloc(dip); |
828 | if (error) | |
829 | return error; | |
830 | ||
b3b94faa DT |
831 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
832 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); | |
833 | ||
72dbf479 BP |
834 | error = gfs2_glock_nq(ghs); /* parent */ |
835 | if (error) | |
836 | goto out_parent; | |
837 | ||
838 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
b3b94faa | 839 | if (error) |
72dbf479 | 840 | goto out_child; |
b3b94faa | 841 | |
d192a8e5 SW |
842 | error = -ENOENT; |
843 | if (inode->i_nlink == 0) | |
844 | goto out_gunlock; | |
845 | ||
10556cb2 | 846 | error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); |
b3b94faa DT |
847 | if (error) |
848 | goto out_gunlock; | |
849 | ||
dbb7cae2 | 850 | error = gfs2_dir_check(dir, &dentry->d_name, NULL); |
b3b94faa DT |
851 | switch (error) { |
852 | case -ENOENT: | |
853 | break; | |
854 | case 0: | |
855 | error = -EEXIST; | |
856 | default: | |
857 | goto out_gunlock; | |
858 | } | |
859 | ||
860 | error = -EINVAL; | |
4f56110a | 861 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
862 | goto out_gunlock; |
863 | error = -EFBIG; | |
ad6203f2 | 864 | if (dip->i_entries == (u32)-1) |
b3b94faa DT |
865 | goto out_gunlock; |
866 | error = -EPERM; | |
867 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
868 | goto out_gunlock; | |
869 | error = -EINVAL; | |
4f56110a | 870 | if (!ip->i_inode.i_nlink) |
b3b94faa DT |
871 | goto out_gunlock; |
872 | error = -EMLINK; | |
4f56110a | 873 | if (ip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
874 | goto out_gunlock; |
875 | ||
c752666c SW |
876 | alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); |
877 | if (error < 0) | |
b3b94faa | 878 | goto out_gunlock; |
c752666c | 879 | error = 0; |
b3b94faa DT |
880 | |
881 | if (alloc_required) { | |
d82661d9 | 882 | error = gfs2_quota_lock_check(dip); |
b3b94faa | 883 | if (error) |
5407e242 | 884 | goto out_gunlock; |
b3b94faa | 885 | |
9dbe9610 | 886 | error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0); |
b3b94faa DT |
887 | if (error) |
888 | goto out_gunlock_q; | |
889 | ||
1b50259b | 890 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
71f890f7 | 891 | gfs2_rg_blocks(dip, sdp->sd_max_dirres) + |
b3b94faa DT |
892 | 2 * RES_DINODE + RES_STATFS + |
893 | RES_QUOTA, 0); | |
894 | if (error) | |
895 | goto out_ipres; | |
896 | } else { | |
897 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); | |
898 | if (error) | |
899 | goto out_ipres; | |
900 | } | |
901 | ||
2baee03f | 902 | error = gfs2_meta_inode_buffer(ip, &dibh); |
b3b94faa DT |
903 | if (error) |
904 | goto out_end_trans; | |
905 | ||
3d6ecb7d | 906 | error = gfs2_dir_add(dir, &dentry->d_name, ip); |
2baee03f SW |
907 | if (error) |
908 | goto out_brelse; | |
909 | ||
350a9b0a | 910 | gfs2_trans_add_meta(ip->i_gl, dibh); |
2baee03f SW |
911 | inc_nlink(&ip->i_inode); |
912 | ip->i_inode.i_ctime = CURRENT_TIME; | |
ab9bbda0 SW |
913 | ihold(inode); |
914 | d_instantiate(dentry, inode); | |
915 | mark_inode_dirty(inode); | |
b3b94faa | 916 | |
2baee03f SW |
917 | out_brelse: |
918 | brelse(dibh); | |
feaa7bba | 919 | out_end_trans: |
b3b94faa | 920 | gfs2_trans_end(sdp); |
feaa7bba | 921 | out_ipres: |
b3b94faa DT |
922 | if (alloc_required) |
923 | gfs2_inplace_release(dip); | |
feaa7bba | 924 | out_gunlock_q: |
b3b94faa DT |
925 | if (alloc_required) |
926 | gfs2_quota_unlock(dip); | |
feaa7bba | 927 | out_gunlock: |
72dbf479 BP |
928 | gfs2_glock_dq(ghs + 1); |
929 | out_child: | |
930 | gfs2_glock_dq(ghs); | |
931 | out_parent: | |
b3b94faa DT |
932 | gfs2_holder_uninit(ghs); |
933 | gfs2_holder_uninit(ghs + 1); | |
b3b94faa DT |
934 | return error; |
935 | } | |
936 | ||
87ec2174 SW |
937 | /* |
938 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
939 | * @dip: the directory | |
940 | * @name: the name of the file | |
941 | * @ip: the inode | |
942 | * | |
943 | * Assumes that the lock on (at least) @dip is held. | |
944 | * | |
945 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
946 | */ | |
947 | ||
948 | static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, | |
949 | const struct gfs2_inode *ip) | |
950 | { | |
951 | int error; | |
952 | ||
953 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) | |
954 | return -EPERM; | |
955 | ||
956 | if ((dip->i_inode.i_mode & S_ISVTX) && | |
6b24c0d2 EB |
957 | !uid_eq(dip->i_inode.i_uid, current_fsuid()) && |
958 | !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) | |
87ec2174 SW |
959 | return -EPERM; |
960 | ||
961 | if (IS_APPEND(&dip->i_inode)) | |
962 | return -EPERM; | |
963 | ||
10556cb2 | 964 | error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); |
87ec2174 SW |
965 | if (error) |
966 | return error; | |
967 | ||
968 | error = gfs2_dir_check(&dip->i_inode, name, ip); | |
969 | if (error) | |
970 | return error; | |
971 | ||
972 | return 0; | |
973 | } | |
974 | ||
b3b94faa | 975 | /** |
855d23ce SW |
976 | * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it |
977 | * @dip: The parent directory | |
978 | * @name: The name of the entry in the parent directory | |
855d23ce SW |
979 | * @inode: The inode to be removed |
980 | * | |
981 | * Called with all the locks and in a transaction. This will only be | |
982 | * called for a directory after it has been checked to ensure it is empty. | |
983 | * | |
984 | * Returns: 0 on success, or an error | |
985 | */ | |
986 | ||
987 | static int gfs2_unlink_inode(struct gfs2_inode *dip, | |
4327a9bf | 988 | const struct dentry *dentry) |
855d23ce SW |
989 | { |
990 | struct inode *inode = dentry->d_inode; | |
991 | struct gfs2_inode *ip = GFS2_I(inode); | |
992 | int error; | |
993 | ||
994 | error = gfs2_dir_del(dip, dentry); | |
995 | if (error) | |
996 | return error; | |
997 | ||
998 | ip->i_entries = 0; | |
999 | inode->i_ctime = CURRENT_TIME; | |
1000 | if (S_ISDIR(inode->i_mode)) | |
1001 | clear_nlink(inode); | |
1002 | else | |
1003 | drop_nlink(inode); | |
855d23ce SW |
1004 | mark_inode_dirty(inode); |
1005 | if (inode->i_nlink == 0) | |
1006 | gfs2_unlink_di(inode); | |
1007 | return 0; | |
1008 | } | |
1009 | ||
1010 | ||
1011 | /** | |
1012 | * gfs2_unlink - Unlink an inode (this does rmdir as well) | |
1013 | * @dir: The inode of the directory containing the inode to unlink | |
b3b94faa DT |
1014 | * @dentry: The file itself |
1015 | * | |
855d23ce SW |
1016 | * This routine uses the type of the inode as a flag to figure out |
1017 | * whether this is an unlink or an rmdir. | |
b3b94faa DT |
1018 | * |
1019 | * Returns: errno | |
1020 | */ | |
1021 | ||
1022 | static int gfs2_unlink(struct inode *dir, struct dentry *dentry) | |
1023 | { | |
feaa7bba SW |
1024 | struct gfs2_inode *dip = GFS2_I(dir); |
1025 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
855d23ce SW |
1026 | struct inode *inode = dentry->d_inode; |
1027 | struct gfs2_inode *ip = GFS2_I(inode); | |
ddee7608 RC |
1028 | struct gfs2_holder ghs[3]; |
1029 | struct gfs2_rgrpd *rgd; | |
5e2f7d61 BP |
1030 | int error; |
1031 | ||
1032 | error = gfs2_rindex_update(sdp); | |
1033 | if (error) | |
1034 | return error; | |
1035 | ||
1036 | error = -EROFS; | |
b3b94faa | 1037 | |
b3b94faa | 1038 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
ddee7608 | 1039 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); |
b3b94faa | 1040 | |
66fc061b | 1041 | rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); |
a365fbf3 | 1042 | if (!rgd) |
87654896 | 1043 | goto out_inodes; |
a365fbf3 | 1044 | |
ddee7608 RC |
1045 | gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); |
1046 | ||
1047 | ||
8497a46e | 1048 | error = gfs2_glock_nq(ghs); /* parent */ |
b3b94faa | 1049 | if (error) |
8497a46e SW |
1050 | goto out_parent; |
1051 | ||
1052 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
1053 | if (error) | |
1054 | goto out_child; | |
1055 | ||
d192a8e5 | 1056 | error = -ENOENT; |
855d23ce | 1057 | if (inode->i_nlink == 0) |
d192a8e5 SW |
1058 | goto out_rgrp; |
1059 | ||
855d23ce SW |
1060 | if (S_ISDIR(inode->i_mode)) { |
1061 | error = -ENOTEMPTY; | |
1062 | if (ip->i_entries > 2 || inode->i_nlink > 2) | |
1063 | goto out_rgrp; | |
1064 | } | |
1065 | ||
8497a46e SW |
1066 | error = gfs2_glock_nq(ghs + 2); /* rgrp */ |
1067 | if (error) | |
1068 | goto out_rgrp; | |
b3b94faa DT |
1069 | |
1070 | error = gfs2_unlink_ok(dip, &dentry->d_name, ip); | |
1071 | if (error) | |
72dbf479 | 1072 | goto out_gunlock; |
b3b94faa | 1073 | |
855d23ce | 1074 | error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); |
855d23ce SW |
1075 | if (error) |
1076 | goto out_end_trans; | |
b3b94faa | 1077 | |
4327a9bf | 1078 | error = gfs2_unlink_inode(dip, dentry); |
b3b94faa | 1079 | |
feaa7bba SW |
1080 | out_end_trans: |
1081 | gfs2_trans_end(sdp); | |
72dbf479 | 1082 | out_gunlock: |
8497a46e SW |
1083 | gfs2_glock_dq(ghs + 2); |
1084 | out_rgrp: | |
8497a46e SW |
1085 | gfs2_glock_dq(ghs + 1); |
1086 | out_child: | |
8497a46e SW |
1087 | gfs2_glock_dq(ghs); |
1088 | out_parent: | |
87654896 SW |
1089 | gfs2_holder_uninit(ghs + 2); |
1090 | out_inodes: | |
1091 | gfs2_holder_uninit(ghs + 1); | |
8497a46e | 1092 | gfs2_holder_uninit(ghs); |
b3b94faa DT |
1093 | return error; |
1094 | } | |
1095 | ||
1096 | /** | |
1097 | * gfs2_symlink - Create a symlink | |
1098 | * @dir: The directory to create the symlink in | |
1099 | * @dentry: The dentry to put the symlink in | |
1100 | * @symname: The thing which the link points to | |
1101 | * | |
1102 | * Returns: errno | |
1103 | */ | |
1104 | ||
1105 | static int gfs2_symlink(struct inode *dir, struct dentry *dentry, | |
1106 | const char *symname) | |
1107 | { | |
feaa7bba | 1108 | struct gfs2_sbd *sdp = GFS2_SB(dir); |
160b4026 | 1109 | unsigned int size; |
b3b94faa | 1110 | |
b3b94faa DT |
1111 | size = strlen(symname); |
1112 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) | |
1113 | return -ENAMETOOLONG; | |
1114 | ||
9a63edd1 | 1115 | return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); |
b3b94faa DT |
1116 | } |
1117 | ||
1118 | /** | |
1119 | * gfs2_mkdir - Make a directory | |
1120 | * @dir: The parent directory of the new one | |
1121 | * @dentry: The dentry of the new directory | |
1122 | * @mode: The mode of the new directory | |
1123 | * | |
1124 | * Returns: errno | |
1125 | */ | |
1126 | ||
18bb1db3 | 1127 | static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
b3b94faa | 1128 | { |
9a63edd1 | 1129 | return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0, 0); |
b3b94faa DT |
1130 | } |
1131 | ||
b3b94faa DT |
1132 | /** |
1133 | * gfs2_mknod - Make a special file | |
1134 | * @dir: The directory in which the special file will reside | |
1135 | * @dentry: The dentry of the special file | |
1136 | * @mode: The mode of the special file | |
f2741d98 | 1137 | * @dev: The device specification of the special file |
b3b94faa DT |
1138 | * |
1139 | */ | |
1140 | ||
1a67aafb | 1141 | static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, |
b3b94faa DT |
1142 | dev_t dev) |
1143 | { | |
9a63edd1 | 1144 | return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 0); |
b3b94faa DT |
1145 | } |
1146 | ||
0188d6c5 SW |
1147 | /* |
1148 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1149 | * @this: move this | |
1150 | * @to: to here | |
1151 | * | |
1152 | * Follow @to back to the root and make sure we don't encounter @this | |
1153 | * Assumes we already hold the rename lock. | |
1154 | * | |
1155 | * Returns: errno | |
1156 | */ | |
1157 | ||
1158 | static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1159 | { | |
1160 | struct inode *dir = &to->i_inode; | |
1161 | struct super_block *sb = dir->i_sb; | |
1162 | struct inode *tmp; | |
0188d6c5 SW |
1163 | int error = 0; |
1164 | ||
0188d6c5 SW |
1165 | igrab(dir); |
1166 | ||
1167 | for (;;) { | |
1168 | if (dir == &this->i_inode) { | |
1169 | error = -EINVAL; | |
1170 | break; | |
1171 | } | |
1172 | if (dir == sb->s_root->d_inode) { | |
1173 | error = 0; | |
1174 | break; | |
1175 | } | |
1176 | ||
8d123585 | 1177 | tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); |
0188d6c5 SW |
1178 | if (IS_ERR(tmp)) { |
1179 | error = PTR_ERR(tmp); | |
1180 | break; | |
1181 | } | |
1182 | ||
1183 | iput(dir); | |
1184 | dir = tmp; | |
1185 | } | |
1186 | ||
1187 | iput(dir); | |
1188 | ||
1189 | return error; | |
1190 | } | |
1191 | ||
b3b94faa DT |
1192 | /** |
1193 | * gfs2_rename - Rename a file | |
1194 | * @odir: Parent directory of old file name | |
1195 | * @odentry: The old dentry of the file | |
1196 | * @ndir: Parent directory of new file name | |
1197 | * @ndentry: The new dentry of the file | |
1198 | * | |
1199 | * Returns: errno | |
1200 | */ | |
1201 | ||
1202 | static int gfs2_rename(struct inode *odir, struct dentry *odentry, | |
1203 | struct inode *ndir, struct dentry *ndentry) | |
1204 | { | |
feaa7bba SW |
1205 | struct gfs2_inode *odip = GFS2_I(odir); |
1206 | struct gfs2_inode *ndip = GFS2_I(ndir); | |
1207 | struct gfs2_inode *ip = GFS2_I(odentry->d_inode); | |
b3b94faa | 1208 | struct gfs2_inode *nip = NULL; |
feaa7bba | 1209 | struct gfs2_sbd *sdp = GFS2_SB(odir); |
8339ee54 | 1210 | struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; |
ddee7608 | 1211 | struct gfs2_rgrpd *nrgd; |
b3b94faa DT |
1212 | unsigned int num_gh; |
1213 | int dir_rename = 0; | |
24b977b5 | 1214 | int alloc_required = 0; |
b3b94faa DT |
1215 | unsigned int x; |
1216 | int error; | |
1217 | ||
b3b94faa | 1218 | if (ndentry->d_inode) { |
feaa7bba | 1219 | nip = GFS2_I(ndentry->d_inode); |
b3b94faa DT |
1220 | if (ip == nip) |
1221 | return 0; | |
1222 | } | |
1223 | ||
5e2f7d61 BP |
1224 | error = gfs2_rindex_update(sdp); |
1225 | if (error) | |
1226 | return error; | |
1227 | ||
0a305e49 BP |
1228 | error = gfs2_rs_alloc(ndip); |
1229 | if (error) | |
1230 | return error; | |
1231 | ||
0188d6c5 SW |
1232 | if (odip != ndip) { |
1233 | error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, | |
1234 | 0, &r_gh); | |
b3b94faa DT |
1235 | if (error) |
1236 | goto out; | |
1237 | ||
0188d6c5 SW |
1238 | if (S_ISDIR(ip->i_inode.i_mode)) { |
1239 | dir_rename = 1; | |
1240 | /* don't move a dirctory into it's subdir */ | |
1241 | error = gfs2_ok_to_move(ip, ndip); | |
1242 | if (error) | |
1243 | goto out_gunlock_r; | |
1244 | } | |
b3b94faa DT |
1245 | } |
1246 | ||
d9d1ca30 | 1247 | num_gh = 1; |
b3b94faa | 1248 | gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
d9d1ca30 SW |
1249 | if (odip != ndip) { |
1250 | gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1251 | num_gh++; | |
1252 | } | |
1253 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1254 | num_gh++; | |
b3b94faa | 1255 | |
d9d1ca30 SW |
1256 | if (nip) { |
1257 | gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1258 | num_gh++; | |
ddee7608 RC |
1259 | /* grab the resource lock for unlink flag twiddling |
1260 | * this is the case of the target file already existing | |
1261 | * so we unlink before doing the rename | |
1262 | */ | |
66fc061b | 1263 | nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); |
ddee7608 RC |
1264 | if (nrgd) |
1265 | gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); | |
d9d1ca30 | 1266 | } |
b3b94faa | 1267 | |
72dbf479 BP |
1268 | for (x = 0; x < num_gh; x++) { |
1269 | error = gfs2_glock_nq(ghs + x); | |
1270 | if (error) | |
1271 | goto out_gunlock; | |
1272 | } | |
b3b94faa | 1273 | |
d192a8e5 SW |
1274 | error = -ENOENT; |
1275 | if (ip->i_inode.i_nlink == 0) | |
1276 | goto out_gunlock; | |
1277 | ||
b3b94faa DT |
1278 | /* Check out the old directory */ |
1279 | ||
1280 | error = gfs2_unlink_ok(odip, &odentry->d_name, ip); | |
1281 | if (error) | |
1282 | goto out_gunlock; | |
1283 | ||
1284 | /* Check out the new directory */ | |
1285 | ||
1286 | if (nip) { | |
1287 | error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); | |
1288 | if (error) | |
1289 | goto out_gunlock; | |
1290 | ||
d192a8e5 SW |
1291 | if (nip->i_inode.i_nlink == 0) { |
1292 | error = -EAGAIN; | |
1293 | goto out_gunlock; | |
1294 | } | |
1295 | ||
b60623c2 | 1296 | if (S_ISDIR(nip->i_inode.i_mode)) { |
ad6203f2 | 1297 | if (nip->i_entries < 2) { |
94fb763b | 1298 | gfs2_consist_inode(nip); |
b3b94faa DT |
1299 | error = -EIO; |
1300 | goto out_gunlock; | |
1301 | } | |
ad6203f2 | 1302 | if (nip->i_entries > 2) { |
b3b94faa DT |
1303 | error = -ENOTEMPTY; |
1304 | goto out_gunlock; | |
1305 | } | |
1306 | } | |
1307 | } else { | |
10556cb2 | 1308 | error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); |
b3b94faa DT |
1309 | if (error) |
1310 | goto out_gunlock; | |
1311 | ||
dbb7cae2 | 1312 | error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); |
b3b94faa DT |
1313 | switch (error) { |
1314 | case -ENOENT: | |
1315 | error = 0; | |
1316 | break; | |
1317 | case 0: | |
1318 | error = -EEXIST; | |
1319 | default: | |
1320 | goto out_gunlock; | |
1321 | }; | |
1322 | ||
1323 | if (odip != ndip) { | |
4f56110a | 1324 | if (!ndip->i_inode.i_nlink) { |
d192a8e5 | 1325 | error = -ENOENT; |
b3b94faa DT |
1326 | goto out_gunlock; |
1327 | } | |
ad6203f2 | 1328 | if (ndip->i_entries == (u32)-1) { |
b3b94faa DT |
1329 | error = -EFBIG; |
1330 | goto out_gunlock; | |
1331 | } | |
b60623c2 | 1332 | if (S_ISDIR(ip->i_inode.i_mode) && |
4f56110a | 1333 | ndip->i_inode.i_nlink == (u32)-1) { |
b3b94faa DT |
1334 | error = -EMLINK; |
1335 | goto out_gunlock; | |
1336 | } | |
1337 | } | |
1338 | } | |
1339 | ||
1340 | /* Check out the dir to be renamed */ | |
1341 | ||
1342 | if (dir_rename) { | |
10556cb2 | 1343 | error = gfs2_permission(odentry->d_inode, MAY_WRITE); |
b3b94faa DT |
1344 | if (error) |
1345 | goto out_gunlock; | |
1346 | } | |
1347 | ||
24b977b5 SW |
1348 | if (nip == NULL) |
1349 | alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); | |
1350 | error = alloc_required; | |
c752666c | 1351 | if (error < 0) |
b3b94faa DT |
1352 | goto out_gunlock; |
1353 | ||
1354 | if (alloc_required) { | |
d82661d9 | 1355 | error = gfs2_quota_lock_check(ndip); |
b3b94faa | 1356 | if (error) |
5407e242 | 1357 | goto out_gunlock; |
b3b94faa | 1358 | |
9dbe9610 | 1359 | error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres, 0); |
b3b94faa DT |
1360 | if (error) |
1361 | goto out_gunlock_q; | |
1362 | ||
fe1bdedc | 1363 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
71f890f7 | 1364 | gfs2_rg_blocks(ndip, sdp->sd_max_dirres) + |
b3b94faa | 1365 | 4 * RES_DINODE + 4 * RES_LEAF + |
87d21e07 | 1366 | RES_STATFS + RES_QUOTA + 4, 0); |
b3b94faa DT |
1367 | if (error) |
1368 | goto out_ipreserv; | |
1369 | } else { | |
1370 | error = gfs2_trans_begin(sdp, 4 * RES_DINODE + | |
87d21e07 | 1371 | 5 * RES_LEAF + 4, 0); |
b3b94faa DT |
1372 | if (error) |
1373 | goto out_gunlock; | |
1374 | } | |
1375 | ||
1376 | /* Remove the target file, if it exists */ | |
1377 | ||
4327a9bf BP |
1378 | if (nip) |
1379 | error = gfs2_unlink_inode(ndip, ndentry); | |
b3b94faa DT |
1380 | |
1381 | if (dir_rename) { | |
8d123585 | 1382 | error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); |
b3b94faa DT |
1383 | if (error) |
1384 | goto out_end_trans; | |
1385 | } else { | |
1386 | struct buffer_head *dibh; | |
1387 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1388 | if (error) | |
1389 | goto out_end_trans; | |
4bd91ba1 | 1390 | ip->i_inode.i_ctime = CURRENT_TIME; |
350a9b0a | 1391 | gfs2_trans_add_meta(ip->i_gl, dibh); |
539e5d6b | 1392 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1393 | brelse(dibh); |
1394 | } | |
1395 | ||
855d23ce | 1396 | error = gfs2_dir_del(odip, odentry); |
b3b94faa DT |
1397 | if (error) |
1398 | goto out_end_trans; | |
1399 | ||
3d6ecb7d | 1400 | error = gfs2_dir_add(ndir, &ndentry->d_name, ip); |
b3b94faa DT |
1401 | if (error) |
1402 | goto out_end_trans; | |
1403 | ||
feaa7bba | 1404 | out_end_trans: |
b3b94faa | 1405 | gfs2_trans_end(sdp); |
feaa7bba | 1406 | out_ipreserv: |
b3b94faa DT |
1407 | if (alloc_required) |
1408 | gfs2_inplace_release(ndip); | |
feaa7bba | 1409 | out_gunlock_q: |
b3b94faa DT |
1410 | if (alloc_required) |
1411 | gfs2_quota_unlock(ndip); | |
feaa7bba | 1412 | out_gunlock: |
72dbf479 BP |
1413 | while (x--) { |
1414 | gfs2_glock_dq(ghs + x); | |
b3b94faa | 1415 | gfs2_holder_uninit(ghs + x); |
72dbf479 | 1416 | } |
feaa7bba | 1417 | out_gunlock_r: |
0188d6c5 | 1418 | if (r_gh.gh_gl) |
b3b94faa | 1419 | gfs2_glock_dq_uninit(&r_gh); |
feaa7bba | 1420 | out: |
b3b94faa DT |
1421 | return error; |
1422 | } | |
1423 | ||
536baf02 | 1424 | /** |
c177c2ac AV |
1425 | * gfs2_follow_link - Follow a symbolic link |
1426 | * @dentry: The dentry of the link | |
1427 | * @nd: Data that we pass to vfs_follow_link() | |
536baf02 | 1428 | * |
c177c2ac | 1429 | * This can handle symlinks of any size. |
536baf02 | 1430 | * |
c177c2ac | 1431 | * Returns: 0 on success or error code |
536baf02 SW |
1432 | */ |
1433 | ||
c177c2ac | 1434 | static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) |
536baf02 | 1435 | { |
c177c2ac | 1436 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); |
536baf02 SW |
1437 | struct gfs2_holder i_gh; |
1438 | struct buffer_head *dibh; | |
160b4026 | 1439 | unsigned int size; |
c177c2ac | 1440 | char *buf; |
536baf02 SW |
1441 | int error; |
1442 | ||
1443 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); | |
1444 | error = gfs2_glock_nq(&i_gh); | |
1445 | if (error) { | |
1446 | gfs2_holder_uninit(&i_gh); | |
c177c2ac AV |
1447 | nd_set_link(nd, ERR_PTR(error)); |
1448 | return NULL; | |
536baf02 SW |
1449 | } |
1450 | ||
a2e0f799 SW |
1451 | size = (unsigned int)i_size_read(&ip->i_inode); |
1452 | if (size == 0) { | |
536baf02 | 1453 | gfs2_consist_inode(ip); |
c177c2ac | 1454 | buf = ERR_PTR(-EIO); |
536baf02 SW |
1455 | goto out; |
1456 | } | |
1457 | ||
1458 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
c177c2ac AV |
1459 | if (error) { |
1460 | buf = ERR_PTR(error); | |
536baf02 | 1461 | goto out; |
536baf02 SW |
1462 | } |
1463 | ||
160b4026 | 1464 | buf = kzalloc(size + 1, GFP_NOFS); |
c177c2ac AV |
1465 | if (!buf) |
1466 | buf = ERR_PTR(-ENOMEM); | |
1467 | else | |
160b4026 | 1468 | memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); |
536baf02 SW |
1469 | brelse(dibh); |
1470 | out: | |
1471 | gfs2_glock_dq_uninit(&i_gh); | |
c177c2ac AV |
1472 | nd_set_link(nd, buf); |
1473 | return NULL; | |
b3b94faa DT |
1474 | } |
1475 | ||
c177c2ac | 1476 | static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
b3b94faa | 1477 | { |
c177c2ac AV |
1478 | char *s = nd_get_link(nd); |
1479 | if (!IS_ERR(s)) | |
1480 | kfree(s); | |
b3b94faa DT |
1481 | } |
1482 | ||
1483 | /** | |
1484 | * gfs2_permission - | |
75d5cfbe SW |
1485 | * @inode: The inode |
1486 | * @mask: The mask to be tested | |
1487 | * @flags: Indicates whether this is an RCU path walk or not | |
b3b94faa | 1488 | * |
300c7d75 SW |
1489 | * This may be called from the VFS directly, or from within GFS2 with the |
1490 | * inode locked, so we look to see if the glock is already locked and only | |
1491 | * lock the glock if its not already been done. | |
1492 | * | |
b3b94faa DT |
1493 | * Returns: errno |
1494 | */ | |
1495 | ||
10556cb2 | 1496 | int gfs2_permission(struct inode *inode, int mask) |
b3b94faa | 1497 | { |
b74c79e9 | 1498 | struct gfs2_inode *ip; |
b3b94faa DT |
1499 | struct gfs2_holder i_gh; |
1500 | int error; | |
300c7d75 | 1501 | int unlock = 0; |
b3b94faa | 1502 | |
b74c79e9 NP |
1503 | |
1504 | ip = GFS2_I(inode); | |
7afd88d9 | 1505 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
10556cb2 | 1506 | if (mask & MAY_NOT_BLOCK) |
75d5cfbe | 1507 | return -ECHILD; |
300c7d75 SW |
1508 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
1509 | if (error) | |
1510 | return error; | |
1511 | unlock = 1; | |
1512 | } | |
b3b94faa | 1513 | |
f58ba889 MS |
1514 | if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) |
1515 | error = -EACCES; | |
1516 | else | |
2830ba7f | 1517 | error = generic_permission(inode, mask); |
300c7d75 | 1518 | if (unlock) |
b3b94faa | 1519 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1520 | |
1521 | return error; | |
1522 | } | |
1523 | ||
ab9bbda0 | 1524 | static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) |
194c011f | 1525 | { |
194c011f SW |
1526 | setattr_copy(inode, attr); |
1527 | mark_inode_dirty(inode); | |
194c011f SW |
1528 | return 0; |
1529 | } | |
1530 | ||
1531 | /** | |
1532 | * gfs2_setattr_simple - | |
1533 | * @ip: | |
1534 | * @attr: | |
1535 | * | |
1536 | * Returns: errno | |
1537 | */ | |
1538 | ||
ab9bbda0 | 1539 | int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) |
194c011f SW |
1540 | { |
1541 | int error; | |
1542 | ||
1543 | if (current->journal_info) | |
ab9bbda0 | 1544 | return __gfs2_setattr_simple(inode, attr); |
194c011f | 1545 | |
ab9bbda0 | 1546 | error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); |
194c011f SW |
1547 | if (error) |
1548 | return error; | |
1549 | ||
ab9bbda0 SW |
1550 | error = __gfs2_setattr_simple(inode, attr); |
1551 | gfs2_trans_end(GFS2_SB(inode)); | |
194c011f SW |
1552 | return error; |
1553 | } | |
1554 | ||
b3b94faa DT |
1555 | static int setattr_chown(struct inode *inode, struct iattr *attr) |
1556 | { | |
feaa7bba SW |
1557 | struct gfs2_inode *ip = GFS2_I(inode); |
1558 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
7c06b5d6 EB |
1559 | kuid_t ouid, nuid; |
1560 | kgid_t ogid, ngid; | |
b3b94faa DT |
1561 | int error; |
1562 | ||
2933f925 SW |
1563 | ouid = inode->i_uid; |
1564 | ogid = inode->i_gid; | |
b3b94faa DT |
1565 | nuid = attr->ia_uid; |
1566 | ngid = attr->ia_gid; | |
1567 | ||
6b24c0d2 | 1568 | if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) |
f4108a60 | 1569 | ouid = nuid = NO_UID_QUOTA_CHANGE; |
6b24c0d2 | 1570 | if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) |
f4108a60 | 1571 | ogid = ngid = NO_GID_QUOTA_CHANGE; |
b3b94faa | 1572 | |
b3b94faa DT |
1573 | error = gfs2_quota_lock(ip, nuid, ngid); |
1574 | if (error) | |
5407e242 | 1575 | return error; |
b3b94faa | 1576 | |
6b24c0d2 EB |
1577 | if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || |
1578 | !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { | |
b3b94faa DT |
1579 | error = gfs2_quota_check(ip, nuid, ngid); |
1580 | if (error) | |
1581 | goto out_gunlock_q; | |
1582 | } | |
1583 | ||
1584 | error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); | |
1585 | if (error) | |
1586 | goto out_gunlock_q; | |
1587 | ||
ab9bbda0 | 1588 | error = gfs2_setattr_simple(inode, attr); |
b3b94faa DT |
1589 | if (error) |
1590 | goto out_end_trans; | |
1591 | ||
6b24c0d2 EB |
1592 | if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || |
1593 | !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { | |
77658aad SW |
1594 | u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); |
1595 | gfs2_quota_change(ip, -blocks, ouid, ogid); | |
1596 | gfs2_quota_change(ip, blocks, nuid, ngid); | |
b3b94faa DT |
1597 | } |
1598 | ||
a91ea69f | 1599 | out_end_trans: |
b3b94faa | 1600 | gfs2_trans_end(sdp); |
a91ea69f | 1601 | out_gunlock_q: |
b3b94faa | 1602 | gfs2_quota_unlock(ip); |
b3b94faa DT |
1603 | return error; |
1604 | } | |
1605 | ||
1606 | /** | |
1607 | * gfs2_setattr - Change attributes on an inode | |
1608 | * @dentry: The dentry which is changing | |
1609 | * @attr: The structure describing the change | |
1610 | * | |
1611 | * The VFS layer wants to change one or more of an inodes attributes. Write | |
1612 | * that change out to disk. | |
1613 | * | |
1614 | * Returns: errno | |
1615 | */ | |
1616 | ||
1617 | static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) | |
1618 | { | |
1619 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1620 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1621 | struct gfs2_holder i_gh; |
1622 | int error; | |
1623 | ||
0a305e49 BP |
1624 | error = gfs2_rs_alloc(ip); |
1625 | if (error) | |
1626 | return error; | |
1627 | ||
b3b94faa DT |
1628 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); |
1629 | if (error) | |
1630 | return error; | |
1631 | ||
1632 | error = -EPERM; | |
1633 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
1634 | goto out; | |
1635 | ||
1636 | error = inode_change_ok(inode, attr); | |
1637 | if (error) | |
1638 | goto out; | |
1639 | ||
1640 | if (attr->ia_valid & ATTR_SIZE) | |
ff8f33c8 | 1641 | error = gfs2_setattr_size(inode, attr->ia_size); |
b3b94faa DT |
1642 | else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) |
1643 | error = setattr_chown(inode, attr); | |
1644 | else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) | |
1645 | error = gfs2_acl_chmod(ip, attr); | |
1646 | else | |
ab9bbda0 | 1647 | error = gfs2_setattr_simple(inode, attr); |
b3b94faa | 1648 | |
a91ea69f | 1649 | out: |
b3b94faa DT |
1650 | if (!error) |
1651 | mark_inode_dirty(inode); | |
ab9bbda0 | 1652 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1653 | return error; |
1654 | } | |
1655 | ||
1656 | /** | |
1657 | * gfs2_getattr - Read out an inode's attributes | |
26c1a574 | 1658 | * @mnt: The vfsmount the inode is being accessed from |
b3b94faa DT |
1659 | * @dentry: The dentry to stat |
1660 | * @stat: The inode's stats | |
1661 | * | |
dcf3dd85 SW |
1662 | * This may be called from the VFS directly, or from within GFS2 with the |
1663 | * inode locked, so we look to see if the glock is already locked and only | |
1664 | * lock the glock if its not already been done. Note that its the NFS | |
1665 | * readdirplus operation which causes this to be called (from filldir) | |
1666 | * with the glock already held. | |
1667 | * | |
b3b94faa DT |
1668 | * Returns: errno |
1669 | */ | |
1670 | ||
1671 | static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
1672 | struct kstat *stat) | |
1673 | { | |
1674 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1675 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1676 | struct gfs2_holder gh; |
1677 | int error; | |
dcf3dd85 | 1678 | int unlock = 0; |
b3b94faa | 1679 | |
7afd88d9 | 1680 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
dcf3dd85 SW |
1681 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1682 | if (error) | |
1683 | return error; | |
1684 | unlock = 1; | |
b3b94faa DT |
1685 | } |
1686 | ||
dcf3dd85 | 1687 | generic_fillattr(inode, stat); |
d7c103d0 | 1688 | if (unlock) |
dcf3dd85 SW |
1689 | gfs2_glock_dq_uninit(&gh); |
1690 | ||
1691 | return 0; | |
b3b94faa DT |
1692 | } |
1693 | ||
1694 | static int gfs2_setxattr(struct dentry *dentry, const char *name, | |
1695 | const void *data, size_t size, int flags) | |
1696 | { | |
feaa7bba | 1697 | struct inode *inode = dentry->d_inode; |
40b78a32 SW |
1698 | struct gfs2_inode *ip = GFS2_I(inode); |
1699 | struct gfs2_holder gh; | |
1700 | int ret; | |
b3b94faa | 1701 | |
40b78a32 SW |
1702 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
1703 | ret = gfs2_glock_nq(&gh); | |
1704 | if (ret == 0) { | |
645b2ccc SW |
1705 | ret = gfs2_rs_alloc(ip); |
1706 | if (ret == 0) | |
1707 | ret = generic_setxattr(dentry, name, data, size, flags); | |
40b78a32 SW |
1708 | gfs2_glock_dq(&gh); |
1709 | } | |
1710 | gfs2_holder_uninit(&gh); | |
1711 | return ret; | |
b3b94faa DT |
1712 | } |
1713 | ||
1714 | static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, | |
1715 | void *data, size_t size) | |
1716 | { | |
40b78a32 SW |
1717 | struct inode *inode = dentry->d_inode; |
1718 | struct gfs2_inode *ip = GFS2_I(inode); | |
1719 | struct gfs2_holder gh; | |
1720 | int ret; | |
b3b94faa | 1721 | |
40b78a32 SW |
1722 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1723 | ret = gfs2_glock_nq(&gh); | |
1724 | if (ret == 0) { | |
1725 | ret = generic_getxattr(dentry, name, data, size); | |
1726 | gfs2_glock_dq(&gh); | |
1727 | } | |
1728 | gfs2_holder_uninit(&gh); | |
1729 | return ret; | |
b3b94faa DT |
1730 | } |
1731 | ||
1732 | static int gfs2_removexattr(struct dentry *dentry, const char *name) | |
1733 | { | |
40b78a32 SW |
1734 | struct inode *inode = dentry->d_inode; |
1735 | struct gfs2_inode *ip = GFS2_I(inode); | |
1736 | struct gfs2_holder gh; | |
1737 | int ret; | |
b3b94faa | 1738 | |
40b78a32 SW |
1739 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
1740 | ret = gfs2_glock_nq(&gh); | |
1741 | if (ret == 0) { | |
645b2ccc SW |
1742 | ret = gfs2_rs_alloc(ip); |
1743 | if (ret == 0) | |
1744 | ret = generic_removexattr(dentry, name); | |
40b78a32 SW |
1745 | gfs2_glock_dq(&gh); |
1746 | } | |
1747 | gfs2_holder_uninit(&gh); | |
1748 | return ret; | |
b3b94faa DT |
1749 | } |
1750 | ||
e9079cce SW |
1751 | static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
1752 | u64 start, u64 len) | |
1753 | { | |
1754 | struct gfs2_inode *ip = GFS2_I(inode); | |
1755 | struct gfs2_holder gh; | |
1756 | int ret; | |
1757 | ||
1758 | ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); | |
1759 | if (ret) | |
1760 | return ret; | |
1761 | ||
1762 | mutex_lock(&inode->i_mutex); | |
1763 | ||
1764 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); | |
1765 | if (ret) | |
1766 | goto out; | |
1767 | ||
1768 | if (gfs2_is_stuffed(ip)) { | |
1769 | u64 phys = ip->i_no_addr << inode->i_blkbits; | |
1770 | u64 size = i_size_read(inode); | |
1771 | u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| | |
1772 | FIEMAP_EXTENT_DATA_INLINE; | |
1773 | phys += sizeof(struct gfs2_dinode); | |
1774 | phys += start; | |
1775 | if (start + len > size) | |
1776 | len = size - start; | |
1777 | if (start < size) | |
1778 | ret = fiemap_fill_next_extent(fieinfo, start, phys, | |
1779 | len, flags); | |
1780 | if (ret == 1) | |
1781 | ret = 0; | |
1782 | } else { | |
1783 | ret = __generic_block_fiemap(inode, fieinfo, start, len, | |
1784 | gfs2_block_map); | |
1785 | } | |
1786 | ||
1787 | gfs2_glock_dq_uninit(&gh); | |
1788 | out: | |
1789 | mutex_unlock(&inode->i_mutex); | |
1790 | return ret; | |
1791 | } | |
1792 | ||
92e1d5be | 1793 | const struct inode_operations gfs2_file_iops = { |
e6305c43 | 1794 | .permission = gfs2_permission, |
b3b94faa DT |
1795 | .setattr = gfs2_setattr, |
1796 | .getattr = gfs2_getattr, | |
1797 | .setxattr = gfs2_setxattr, | |
1798 | .getxattr = gfs2_getxattr, | |
1799 | .listxattr = gfs2_listxattr, | |
1800 | .removexattr = gfs2_removexattr, | |
e9079cce | 1801 | .fiemap = gfs2_fiemap, |
4e34e719 | 1802 | .get_acl = gfs2_get_acl, |
b3b94faa DT |
1803 | }; |
1804 | ||
92e1d5be | 1805 | const struct inode_operations gfs2_dir_iops = { |
b3b94faa DT |
1806 | .create = gfs2_create, |
1807 | .lookup = gfs2_lookup, | |
1808 | .link = gfs2_link, | |
1809 | .unlink = gfs2_unlink, | |
1810 | .symlink = gfs2_symlink, | |
1811 | .mkdir = gfs2_mkdir, | |
855d23ce | 1812 | .rmdir = gfs2_unlink, |
b3b94faa DT |
1813 | .mknod = gfs2_mknod, |
1814 | .rename = gfs2_rename, | |
e6305c43 | 1815 | .permission = gfs2_permission, |
b3b94faa DT |
1816 | .setattr = gfs2_setattr, |
1817 | .getattr = gfs2_getattr, | |
1818 | .setxattr = gfs2_setxattr, | |
1819 | .getxattr = gfs2_getxattr, | |
1820 | .listxattr = gfs2_listxattr, | |
1821 | .removexattr = gfs2_removexattr, | |
e9079cce | 1822 | .fiemap = gfs2_fiemap, |
4e34e719 | 1823 | .get_acl = gfs2_get_acl, |
b3b94faa DT |
1824 | }; |
1825 | ||
92e1d5be | 1826 | const struct inode_operations gfs2_symlink_iops = { |
c177c2ac | 1827 | .readlink = generic_readlink, |
b3b94faa | 1828 | .follow_link = gfs2_follow_link, |
c177c2ac | 1829 | .put_link = gfs2_put_link, |
e6305c43 | 1830 | .permission = gfs2_permission, |
b3b94faa DT |
1831 | .setattr = gfs2_setattr, |
1832 | .getattr = gfs2_getattr, | |
1833 | .setxattr = gfs2_setxattr, | |
1834 | .getxattr = gfs2_getxattr, | |
1835 | .listxattr = gfs2_listxattr, | |
1836 | .removexattr = gfs2_removexattr, | |
e9079cce | 1837 | .fiemap = gfs2_fiemap, |
4e34e719 | 1838 | .get_acl = gfs2_get_acl, |
b3b94faa DT |
1839 | }; |
1840 |