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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 | 450 | { |
194c011f SW |
451 | struct gfs2_dinode *di; |
452 | struct buffer_head *dibh; | |
194c011f | 453 | |
c9aecf73 | 454 | dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); |
350a9b0a | 455 | gfs2_trans_add_meta(ip->i_gl, dibh); |
194c011f SW |
456 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
457 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
458 | di = (struct gfs2_dinode *)dibh->b_data; | |
459 | ||
c9aecf73 SW |
460 | di->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino); |
461 | di->di_num.no_addr = cpu_to_be64(ip->i_no_addr); | |
462 | di->di_mode = cpu_to_be32(ip->i_inode.i_mode); | |
d0546426 EB |
463 | di->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode)); |
464 | di->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode)); | |
194c011f | 465 | di->di_nlink = 0; |
c9aecf73 | 466 | di->di_size = cpu_to_be64(ip->i_inode.i_size); |
28fb3027 | 467 | di->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode)); |
fd4b4e04 SW |
468 | di->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); |
469 | di->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec); | |
470 | di->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec); | |
c9aecf73 SW |
471 | di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev)); |
472 | di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); | |
473 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(ip->i_no_addr); | |
474 | di->di_generation = cpu_to_be64(ip->i_generation); | |
28fb3027 | 475 | di->di_flags = cpu_to_be32(ip->i_diskflags); |
194c011f | 476 | di->__pad1 = 0; |
c9aecf73 | 477 | di->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) ? GFS2_FORMAT_DE : 0); |
28fb3027 | 478 | di->di_height = cpu_to_be16(ip->i_height); |
194c011f SW |
479 | di->__pad2 = 0; |
480 | di->__pad3 = 0; | |
28fb3027 SW |
481 | di->di_depth = cpu_to_be16(ip->i_depth); |
482 | di->di_entries = cpu_to_be32(ip->i_entries); | |
194c011f | 483 | memset(&di->__pad4, 0, sizeof(di->__pad4)); |
28fb3027 | 484 | di->di_eattr = cpu_to_be64(ip->i_eattr); |
fd4b4e04 SW |
485 | di->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec); |
486 | di->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec); | |
487 | di->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec); | |
194c011f | 488 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); |
160b4026 | 489 | |
c9aecf73 | 490 | switch(ip->i_inode.i_mode & S_IFMT) { |
160b4026 | 491 | case S_IFDIR: |
e2d0a13b | 492 | gfs2_init_dir(dibh, dip); |
160b4026 SW |
493 | break; |
494 | case S_IFLNK: | |
c9aecf73 | 495 | memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); |
160b4026 | 496 | break; |
e2d0a13b SW |
497 | } |
498 | ||
194c011f SW |
499 | set_buffer_uptodate(dibh); |
500 | ||
501 | *bhp = dibh; | |
502 | } | |
503 | ||
194c011f | 504 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
fd4b4e04 | 505 | struct gfs2_inode *ip, int arq) |
194c011f SW |
506 | { |
507 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
194c011f SW |
508 | int error; |
509 | ||
fd4b4e04 | 510 | if (arq) { |
28fb3027 | 511 | error = gfs2_quota_lock_check(dip); |
194c011f SW |
512 | if (error) |
513 | goto fail_quota_locks; | |
514 | ||
9dbe9610 | 515 | error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0); |
194c011f SW |
516 | if (error) |
517 | goto fail_quota_locks; | |
518 | ||
519 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + | |
54335b1f | 520 | dip->i_rgd->rd_length + |
194c011f SW |
521 | 2 * RES_DINODE + |
522 | RES_STATFS + RES_QUOTA, 0); | |
523 | if (error) | |
524 | goto fail_ipreserv; | |
525 | } else { | |
526 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); | |
527 | if (error) | |
528 | goto fail_quota_locks; | |
529 | } | |
530 | ||
531 | error = gfs2_dir_add(&dip->i_inode, name, ip); | |
532 | if (error) | |
533 | goto fail_end_trans; | |
534 | ||
66ad863b | 535 | set_nlink(&ip->i_inode, S_ISDIR(ip->i_inode.i_mode) ? 2 : 1); |
28fb3027 | 536 | mark_inode_dirty(&ip->i_inode); |
194c011f SW |
537 | |
538 | fail_end_trans: | |
539 | gfs2_trans_end(sdp); | |
194c011f | 540 | fail_ipreserv: |
fd4b4e04 | 541 | gfs2_inplace_release(dip); |
194c011f SW |
542 | fail_quota_locks: |
543 | gfs2_quota_unlock(dip); | |
194c011f SW |
544 | return error; |
545 | } | |
546 | ||
46cc1e5f | 547 | static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, |
9d8f13ba | 548 | void *fs_info) |
194c011f | 549 | { |
9d8f13ba MZ |
550 | const struct xattr *xattr; |
551 | int err = 0; | |
552 | ||
553 | for (xattr = xattr_array; xattr->name != NULL; xattr++) { | |
554 | err = __gfs2_xattr_set(inode, xattr->name, xattr->value, | |
555 | xattr->value_len, 0, | |
556 | GFS2_EATYPE_SECURITY); | |
557 | if (err < 0) | |
558 | break; | |
194c011f | 559 | } |
194c011f SW |
560 | return err; |
561 | } | |
b3b94faa | 562 | |
9d8f13ba MZ |
563 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, |
564 | const struct qstr *qstr) | |
565 | { | |
566 | return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, | |
567 | &gfs2_initxattrs, NULL); | |
568 | } | |
569 | ||
194c011f | 570 | /** |
f2741d98 SW |
571 | * gfs2_create_inode - Create a new inode |
572 | * @dir: The parent directory | |
573 | * @dentry: The new dentry | |
574 | * @mode: The permissions on the new inode | |
575 | * @dev: For device nodes, this is the device number | |
576 | * @symname: For symlinks, this is the link destination | |
577 | * @size: The initial size of the inode (ignored for directories) | |
194c011f | 578 | * |
f2741d98 | 579 | * Returns: 0 on success, or error code |
194c011f SW |
580 | */ |
581 | ||
f2741d98 | 582 | static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, |
175a4eb7 | 583 | umode_t mode, dev_t dev, const char *symname, |
9a63edd1 | 584 | unsigned int size, int excl) |
194c011f | 585 | { |
f2741d98 SW |
586 | const struct qstr *name = &dentry->d_name; |
587 | struct gfs2_holder ghs[2]; | |
194c011f | 588 | struct inode *inode = NULL; |
8e2e0047 | 589 | struct gfs2_inode *dip = GFS2_I(dir), *ip; |
194c011f | 590 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
c9aecf73 | 591 | struct gfs2_glock *io_gl; |
194c011f | 592 | int error; |
194c011f | 593 | struct buffer_head *bh = NULL; |
9dbe9610 | 594 | u32 aflags = 0; |
fd4b4e04 | 595 | int arq; |
194c011f SW |
596 | |
597 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
f2741d98 | 598 | return -ENAMETOOLONG; |
194c011f | 599 | |
0a305e49 BP |
600 | error = gfs2_rs_alloc(dip); |
601 | if (error) | |
602 | return error; | |
603 | ||
fd4b4e04 SW |
604 | error = gfs2_rindex_update(sdp); |
605 | if (error) | |
606 | return error; | |
607 | ||
f2741d98 | 608 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
194c011f SW |
609 | if (error) |
610 | goto fail; | |
611 | ||
612 | error = create_ok(dip, name, mode); | |
9a63edd1 SW |
613 | if ((error == -EEXIST) && S_ISREG(mode) && !excl) { |
614 | inode = gfs2_lookupi(dir, &dentry->d_name, 0); | |
615 | gfs2_glock_dq_uninit(ghs); | |
616 | d_instantiate(dentry, inode); | |
617 | return IS_ERR(inode) ? PTR_ERR(inode) : 0; | |
618 | } | |
194c011f SW |
619 | if (error) |
620 | goto fail_gunlock; | |
621 | ||
fd4b4e04 SW |
622 | arq = error = gfs2_diradd_alloc_required(dir, name); |
623 | if (error < 0) | |
624 | goto fail_gunlock; | |
625 | ||
c9aecf73 | 626 | inode = new_inode(sdp->sd_vfs); |
fd4b4e04 SW |
627 | error = -ENOMEM; |
628 | if (!inode) | |
629 | goto fail_gunlock; | |
630 | ||
c9aecf73 SW |
631 | ip = GFS2_I(inode); |
632 | error = gfs2_rs_alloc(ip); | |
194c011f | 633 | if (error) |
c9aecf73 SW |
634 | goto fail_free_inode; |
635 | ||
c9aecf73 SW |
636 | inode->i_mode = mode; |
637 | inode->i_rdev = dev; | |
638 | inode->i_size = size; | |
fd4b4e04 | 639 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
28fb3027 | 640 | gfs2_set_inode_blocks(inode, 1); |
c9aecf73 SW |
641 | munge_mode_uid_gid(dip, inode); |
642 | ip->i_goal = dip->i_goal; | |
28fb3027 SW |
643 | ip->i_diskflags = 0; |
644 | ip->i_eattr = 0; | |
645 | ip->i_height = 0; | |
646 | ip->i_depth = 0; | |
647 | ip->i_entries = 0; | |
648 | ||
649 | switch(mode & S_IFMT) { | |
650 | case S_IFREG: | |
651 | if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || | |
652 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
653 | ip->i_diskflags |= GFS2_DIF_JDATA; | |
654 | gfs2_set_aops(inode); | |
655 | break; | |
656 | case S_IFDIR: | |
657 | ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); | |
658 | ip->i_diskflags |= GFS2_DIF_JDATA; | |
659 | ip->i_entries = 2; | |
660 | break; | |
661 | } | |
662 | gfs2_set_inode_flags(inode); | |
194c011f | 663 | |
9dbe9610 SW |
664 | if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || |
665 | (dip->i_diskflags & GFS2_DIF_TOPDIR)) | |
666 | aflags |= GFS2_AF_ORLOV; | |
667 | ||
668 | error = alloc_dinode(ip, aflags); | |
194c011f | 669 | if (error) |
c9aecf73 | 670 | goto fail_free_inode; |
194c011f | 671 | |
c9aecf73 | 672 | error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
194c011f | 673 | if (error) |
c9aecf73 | 674 | goto fail_free_inode; |
194c011f | 675 | |
1e2d9d44 | 676 | ip->i_gl->gl_object = ip; |
c9aecf73 SW |
677 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); |
678 | if (error) | |
679 | goto fail_free_inode; | |
680 | ||
fd4b4e04 | 681 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
c9aecf73 | 682 | if (error) |
194c011f SW |
683 | goto fail_gunlock2; |
684 | ||
fd4b4e04 SW |
685 | init_dinode(dip, ip, symname, &bh); |
686 | gfs2_trans_end(sdp); | |
687 | ||
c9aecf73 | 688 | error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
194c011f SW |
689 | if (error) |
690 | goto fail_gunlock2; | |
691 | ||
c9aecf73 | 692 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); |
ff7f4cb4 SW |
693 | if (error) |
694 | goto fail_gunlock2; | |
0a305e49 | 695 | |
c9aecf73 SW |
696 | ip->i_iopen_gh.gh_gl->gl_object = ip; |
697 | gfs2_glock_put(io_gl); | |
698 | gfs2_set_iop(inode); | |
699 | insert_inode_hash(inode); | |
700 | ||
194c011f SW |
701 | error = gfs2_acl_create(dip, inode); |
702 | if (error) | |
c9aecf73 | 703 | goto fail_gunlock3; |
194c011f | 704 | |
8e2e0047 | 705 | error = gfs2_security_init(dip, ip, name); |
194c011f | 706 | if (error) |
c9aecf73 | 707 | goto fail_gunlock3; |
194c011f | 708 | |
fd4b4e04 | 709 | error = link_dinode(dip, name, ip, arq); |
194c011f | 710 | if (error) |
c9aecf73 | 711 | goto fail_gunlock3; |
194c011f | 712 | |
28fb3027 SW |
713 | brelse(bh); |
714 | gfs2_glock_dq_uninit(ghs); | |
715 | gfs2_glock_dq_uninit(ghs + 1); | |
f2741d98 SW |
716 | d_instantiate(dentry, inode); |
717 | return 0; | |
194c011f | 718 | |
c9aecf73 SW |
719 | fail_gunlock3: |
720 | gfs2_glock_dq_uninit(ghs + 1); | |
721 | if (ip->i_gl) | |
722 | gfs2_glock_put(ip->i_gl); | |
723 | goto fail_gunlock; | |
724 | ||
194c011f SW |
725 | fail_gunlock2: |
726 | gfs2_glock_dq_uninit(ghs + 1); | |
c9aecf73 SW |
727 | fail_free_inode: |
728 | if (ip->i_gl) | |
729 | gfs2_glock_put(ip->i_gl); | |
730 | gfs2_rs_delete(ip); | |
731 | free_inode_nonrcu(inode); | |
732 | inode = NULL; | |
194c011f | 733 | fail_gunlock: |
f2741d98 | 734 | gfs2_glock_dq_uninit(ghs); |
40ac218f SW |
735 | if (inode && !IS_ERR(inode)) { |
736 | set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags); | |
737 | iput(inode); | |
738 | } | |
194c011f SW |
739 | fail: |
740 | if (bh) | |
741 | brelse(bh); | |
f2741d98 | 742 | return error; |
194c011f | 743 | } |
f2741d98 | 744 | |
b3b94faa DT |
745 | /** |
746 | * gfs2_create - Create a file | |
747 | * @dir: The directory in which to create the file | |
748 | * @dentry: The dentry of the new file | |
749 | * @mode: The mode of the new file | |
750 | * | |
751 | * Returns: errno | |
752 | */ | |
753 | ||
754 | static int gfs2_create(struct inode *dir, struct dentry *dentry, | |
ebfc3b49 | 755 | umode_t mode, bool excl) |
b3b94faa | 756 | { |
9a63edd1 | 757 | return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl); |
b3b94faa DT |
758 | } |
759 | ||
760 | /** | |
761 | * gfs2_lookup - Look up a filename in a directory and return its inode | |
762 | * @dir: The directory inode | |
763 | * @dentry: The dentry of the new inode | |
764 | * @nd: passed from Linux VFS, ignored by us | |
765 | * | |
766 | * Called by the VFS layer. Lock dir and call gfs2_lookupi() | |
767 | * | |
768 | * Returns: errno | |
769 | */ | |
770 | ||
771 | static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, | |
00cd8dd3 | 772 | unsigned int flags) |
b3b94faa | 773 | { |
6c673ab3 AV |
774 | struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0); |
775 | if (inode && !IS_ERR(inode)) { | |
9656b2c1 SW |
776 | struct gfs2_glock *gl = GFS2_I(inode)->i_gl; |
777 | struct gfs2_holder gh; | |
778 | int error; | |
779 | error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); | |
780 | if (error) { | |
781 | iput(inode); | |
782 | return ERR_PTR(error); | |
783 | } | |
784 | gfs2_glock_dq_uninit(&gh); | |
9656b2c1 | 785 | } |
6c673ab3 | 786 | return d_splice_alias(inode, dentry); |
b3b94faa DT |
787 | } |
788 | ||
789 | /** | |
790 | * gfs2_link - Link to a file | |
791 | * @old_dentry: The inode to link | |
792 | * @dir: Add link to this directory | |
793 | * @dentry: The name of the link | |
794 | * | |
795 | * Link the inode in "old_dentry" into the directory "dir" with the | |
796 | * name in "dentry". | |
797 | * | |
798 | * Returns: errno | |
799 | */ | |
800 | ||
801 | static int gfs2_link(struct dentry *old_dentry, struct inode *dir, | |
802 | struct dentry *dentry) | |
803 | { | |
feaa7bba SW |
804 | struct gfs2_inode *dip = GFS2_I(dir); |
805 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa | 806 | struct inode *inode = old_dentry->d_inode; |
feaa7bba | 807 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 808 | struct gfs2_holder ghs[2]; |
2baee03f | 809 | struct buffer_head *dibh; |
b3b94faa DT |
810 | int alloc_required; |
811 | int error; | |
812 | ||
b60623c2 | 813 | if (S_ISDIR(inode->i_mode)) |
b3b94faa DT |
814 | return -EPERM; |
815 | ||
0a305e49 BP |
816 | error = gfs2_rs_alloc(dip); |
817 | if (error) | |
818 | return error; | |
819 | ||
b3b94faa DT |
820 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
821 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); | |
822 | ||
72dbf479 BP |
823 | error = gfs2_glock_nq(ghs); /* parent */ |
824 | if (error) | |
825 | goto out_parent; | |
826 | ||
827 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
b3b94faa | 828 | if (error) |
72dbf479 | 829 | goto out_child; |
b3b94faa | 830 | |
d192a8e5 SW |
831 | error = -ENOENT; |
832 | if (inode->i_nlink == 0) | |
833 | goto out_gunlock; | |
834 | ||
10556cb2 | 835 | error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); |
b3b94faa DT |
836 | if (error) |
837 | goto out_gunlock; | |
838 | ||
dbb7cae2 | 839 | error = gfs2_dir_check(dir, &dentry->d_name, NULL); |
b3b94faa DT |
840 | switch (error) { |
841 | case -ENOENT: | |
842 | break; | |
843 | case 0: | |
844 | error = -EEXIST; | |
845 | default: | |
846 | goto out_gunlock; | |
847 | } | |
848 | ||
849 | error = -EINVAL; | |
4f56110a | 850 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
851 | goto out_gunlock; |
852 | error = -EFBIG; | |
ad6203f2 | 853 | if (dip->i_entries == (u32)-1) |
b3b94faa DT |
854 | goto out_gunlock; |
855 | error = -EPERM; | |
856 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
857 | goto out_gunlock; | |
858 | error = -EINVAL; | |
4f56110a | 859 | if (!ip->i_inode.i_nlink) |
b3b94faa DT |
860 | goto out_gunlock; |
861 | error = -EMLINK; | |
4f56110a | 862 | if (ip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
863 | goto out_gunlock; |
864 | ||
c752666c SW |
865 | alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); |
866 | if (error < 0) | |
b3b94faa | 867 | goto out_gunlock; |
c752666c | 868 | error = 0; |
b3b94faa DT |
869 | |
870 | if (alloc_required) { | |
d82661d9 | 871 | error = gfs2_quota_lock_check(dip); |
b3b94faa | 872 | if (error) |
5407e242 | 873 | goto out_gunlock; |
b3b94faa | 874 | |
9dbe9610 | 875 | error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0); |
b3b94faa DT |
876 | if (error) |
877 | goto out_gunlock_q; | |
878 | ||
1b50259b | 879 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
71f890f7 | 880 | gfs2_rg_blocks(dip, sdp->sd_max_dirres) + |
b3b94faa DT |
881 | 2 * RES_DINODE + RES_STATFS + |
882 | RES_QUOTA, 0); | |
883 | if (error) | |
884 | goto out_ipres; | |
885 | } else { | |
886 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); | |
887 | if (error) | |
888 | goto out_ipres; | |
889 | } | |
890 | ||
2baee03f | 891 | error = gfs2_meta_inode_buffer(ip, &dibh); |
b3b94faa DT |
892 | if (error) |
893 | goto out_end_trans; | |
894 | ||
3d6ecb7d | 895 | error = gfs2_dir_add(dir, &dentry->d_name, ip); |
2baee03f SW |
896 | if (error) |
897 | goto out_brelse; | |
898 | ||
350a9b0a | 899 | gfs2_trans_add_meta(ip->i_gl, dibh); |
2baee03f SW |
900 | inc_nlink(&ip->i_inode); |
901 | ip->i_inode.i_ctime = CURRENT_TIME; | |
ab9bbda0 SW |
902 | ihold(inode); |
903 | d_instantiate(dentry, inode); | |
904 | mark_inode_dirty(inode); | |
b3b94faa | 905 | |
2baee03f SW |
906 | out_brelse: |
907 | brelse(dibh); | |
feaa7bba | 908 | out_end_trans: |
b3b94faa | 909 | gfs2_trans_end(sdp); |
feaa7bba | 910 | out_ipres: |
b3b94faa DT |
911 | if (alloc_required) |
912 | gfs2_inplace_release(dip); | |
feaa7bba | 913 | out_gunlock_q: |
b3b94faa DT |
914 | if (alloc_required) |
915 | gfs2_quota_unlock(dip); | |
feaa7bba | 916 | out_gunlock: |
72dbf479 BP |
917 | gfs2_glock_dq(ghs + 1); |
918 | out_child: | |
919 | gfs2_glock_dq(ghs); | |
920 | out_parent: | |
b3b94faa DT |
921 | gfs2_holder_uninit(ghs); |
922 | gfs2_holder_uninit(ghs + 1); | |
b3b94faa DT |
923 | return error; |
924 | } | |
925 | ||
87ec2174 SW |
926 | /* |
927 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
928 | * @dip: the directory | |
929 | * @name: the name of the file | |
930 | * @ip: the inode | |
931 | * | |
932 | * Assumes that the lock on (at least) @dip is held. | |
933 | * | |
934 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
935 | */ | |
936 | ||
937 | static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, | |
938 | const struct gfs2_inode *ip) | |
939 | { | |
940 | int error; | |
941 | ||
942 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) | |
943 | return -EPERM; | |
944 | ||
945 | if ((dip->i_inode.i_mode & S_ISVTX) && | |
6b24c0d2 EB |
946 | !uid_eq(dip->i_inode.i_uid, current_fsuid()) && |
947 | !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) | |
87ec2174 SW |
948 | return -EPERM; |
949 | ||
950 | if (IS_APPEND(&dip->i_inode)) | |
951 | return -EPERM; | |
952 | ||
10556cb2 | 953 | error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); |
87ec2174 SW |
954 | if (error) |
955 | return error; | |
956 | ||
957 | error = gfs2_dir_check(&dip->i_inode, name, ip); | |
958 | if (error) | |
959 | return error; | |
960 | ||
961 | return 0; | |
962 | } | |
963 | ||
b3b94faa | 964 | /** |
855d23ce SW |
965 | * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it |
966 | * @dip: The parent directory | |
967 | * @name: The name of the entry in the parent directory | |
855d23ce SW |
968 | * @inode: The inode to be removed |
969 | * | |
970 | * Called with all the locks and in a transaction. This will only be | |
971 | * called for a directory after it has been checked to ensure it is empty. | |
972 | * | |
973 | * Returns: 0 on success, or an error | |
974 | */ | |
975 | ||
976 | static int gfs2_unlink_inode(struct gfs2_inode *dip, | |
4327a9bf | 977 | const struct dentry *dentry) |
855d23ce SW |
978 | { |
979 | struct inode *inode = dentry->d_inode; | |
980 | struct gfs2_inode *ip = GFS2_I(inode); | |
981 | int error; | |
982 | ||
983 | error = gfs2_dir_del(dip, dentry); | |
984 | if (error) | |
985 | return error; | |
986 | ||
987 | ip->i_entries = 0; | |
988 | inode->i_ctime = CURRENT_TIME; | |
989 | if (S_ISDIR(inode->i_mode)) | |
990 | clear_nlink(inode); | |
991 | else | |
992 | drop_nlink(inode); | |
855d23ce SW |
993 | mark_inode_dirty(inode); |
994 | if (inode->i_nlink == 0) | |
995 | gfs2_unlink_di(inode); | |
996 | return 0; | |
997 | } | |
998 | ||
999 | ||
1000 | /** | |
1001 | * gfs2_unlink - Unlink an inode (this does rmdir as well) | |
1002 | * @dir: The inode of the directory containing the inode to unlink | |
b3b94faa DT |
1003 | * @dentry: The file itself |
1004 | * | |
855d23ce SW |
1005 | * This routine uses the type of the inode as a flag to figure out |
1006 | * whether this is an unlink or an rmdir. | |
b3b94faa DT |
1007 | * |
1008 | * Returns: errno | |
1009 | */ | |
1010 | ||
1011 | static int gfs2_unlink(struct inode *dir, struct dentry *dentry) | |
1012 | { | |
feaa7bba SW |
1013 | struct gfs2_inode *dip = GFS2_I(dir); |
1014 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
855d23ce SW |
1015 | struct inode *inode = dentry->d_inode; |
1016 | struct gfs2_inode *ip = GFS2_I(inode); | |
ddee7608 RC |
1017 | struct gfs2_holder ghs[3]; |
1018 | struct gfs2_rgrpd *rgd; | |
5e2f7d61 BP |
1019 | int error; |
1020 | ||
1021 | error = gfs2_rindex_update(sdp); | |
1022 | if (error) | |
1023 | return error; | |
1024 | ||
1025 | error = -EROFS; | |
b3b94faa | 1026 | |
b3b94faa | 1027 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
ddee7608 | 1028 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); |
b3b94faa | 1029 | |
66fc061b | 1030 | rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); |
a365fbf3 | 1031 | if (!rgd) |
87654896 | 1032 | goto out_inodes; |
a365fbf3 | 1033 | |
ddee7608 RC |
1034 | gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); |
1035 | ||
1036 | ||
8497a46e | 1037 | error = gfs2_glock_nq(ghs); /* parent */ |
b3b94faa | 1038 | if (error) |
8497a46e SW |
1039 | goto out_parent; |
1040 | ||
1041 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
1042 | if (error) | |
1043 | goto out_child; | |
1044 | ||
d192a8e5 | 1045 | error = -ENOENT; |
855d23ce | 1046 | if (inode->i_nlink == 0) |
d192a8e5 SW |
1047 | goto out_rgrp; |
1048 | ||
855d23ce SW |
1049 | if (S_ISDIR(inode->i_mode)) { |
1050 | error = -ENOTEMPTY; | |
1051 | if (ip->i_entries > 2 || inode->i_nlink > 2) | |
1052 | goto out_rgrp; | |
1053 | } | |
1054 | ||
8497a46e SW |
1055 | error = gfs2_glock_nq(ghs + 2); /* rgrp */ |
1056 | if (error) | |
1057 | goto out_rgrp; | |
b3b94faa DT |
1058 | |
1059 | error = gfs2_unlink_ok(dip, &dentry->d_name, ip); | |
1060 | if (error) | |
72dbf479 | 1061 | goto out_gunlock; |
b3b94faa | 1062 | |
855d23ce | 1063 | error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); |
855d23ce SW |
1064 | if (error) |
1065 | goto out_end_trans; | |
b3b94faa | 1066 | |
4327a9bf | 1067 | error = gfs2_unlink_inode(dip, dentry); |
b3b94faa | 1068 | |
feaa7bba SW |
1069 | out_end_trans: |
1070 | gfs2_trans_end(sdp); | |
72dbf479 | 1071 | out_gunlock: |
8497a46e SW |
1072 | gfs2_glock_dq(ghs + 2); |
1073 | out_rgrp: | |
8497a46e SW |
1074 | gfs2_glock_dq(ghs + 1); |
1075 | out_child: | |
8497a46e SW |
1076 | gfs2_glock_dq(ghs); |
1077 | out_parent: | |
87654896 SW |
1078 | gfs2_holder_uninit(ghs + 2); |
1079 | out_inodes: | |
1080 | gfs2_holder_uninit(ghs + 1); | |
8497a46e | 1081 | gfs2_holder_uninit(ghs); |
b3b94faa DT |
1082 | return error; |
1083 | } | |
1084 | ||
1085 | /** | |
1086 | * gfs2_symlink - Create a symlink | |
1087 | * @dir: The directory to create the symlink in | |
1088 | * @dentry: The dentry to put the symlink in | |
1089 | * @symname: The thing which the link points to | |
1090 | * | |
1091 | * Returns: errno | |
1092 | */ | |
1093 | ||
1094 | static int gfs2_symlink(struct inode *dir, struct dentry *dentry, | |
1095 | const char *symname) | |
1096 | { | |
feaa7bba | 1097 | struct gfs2_sbd *sdp = GFS2_SB(dir); |
160b4026 | 1098 | unsigned int size; |
b3b94faa | 1099 | |
b3b94faa DT |
1100 | size = strlen(symname); |
1101 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) | |
1102 | return -ENAMETOOLONG; | |
1103 | ||
9a63edd1 | 1104 | return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); |
b3b94faa DT |
1105 | } |
1106 | ||
1107 | /** | |
1108 | * gfs2_mkdir - Make a directory | |
1109 | * @dir: The parent directory of the new one | |
1110 | * @dentry: The dentry of the new directory | |
1111 | * @mode: The mode of the new directory | |
1112 | * | |
1113 | * Returns: errno | |
1114 | */ | |
1115 | ||
18bb1db3 | 1116 | static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
b3b94faa | 1117 | { |
28fb3027 SW |
1118 | struct gfs2_sbd *sdp = GFS2_SB(dir); |
1119 | unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); | |
1120 | return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, dsize, 0); | |
b3b94faa DT |
1121 | } |
1122 | ||
b3b94faa DT |
1123 | /** |
1124 | * gfs2_mknod - Make a special file | |
1125 | * @dir: The directory in which the special file will reside | |
1126 | * @dentry: The dentry of the special file | |
1127 | * @mode: The mode of the special file | |
f2741d98 | 1128 | * @dev: The device specification of the special file |
b3b94faa DT |
1129 | * |
1130 | */ | |
1131 | ||
1a67aafb | 1132 | static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, |
b3b94faa DT |
1133 | dev_t dev) |
1134 | { | |
9a63edd1 | 1135 | return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 0); |
b3b94faa DT |
1136 | } |
1137 | ||
0188d6c5 SW |
1138 | /* |
1139 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1140 | * @this: move this | |
1141 | * @to: to here | |
1142 | * | |
1143 | * Follow @to back to the root and make sure we don't encounter @this | |
1144 | * Assumes we already hold the rename lock. | |
1145 | * | |
1146 | * Returns: errno | |
1147 | */ | |
1148 | ||
1149 | static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1150 | { | |
1151 | struct inode *dir = &to->i_inode; | |
1152 | struct super_block *sb = dir->i_sb; | |
1153 | struct inode *tmp; | |
0188d6c5 SW |
1154 | int error = 0; |
1155 | ||
0188d6c5 SW |
1156 | igrab(dir); |
1157 | ||
1158 | for (;;) { | |
1159 | if (dir == &this->i_inode) { | |
1160 | error = -EINVAL; | |
1161 | break; | |
1162 | } | |
1163 | if (dir == sb->s_root->d_inode) { | |
1164 | error = 0; | |
1165 | break; | |
1166 | } | |
1167 | ||
8d123585 | 1168 | tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); |
0188d6c5 SW |
1169 | if (IS_ERR(tmp)) { |
1170 | error = PTR_ERR(tmp); | |
1171 | break; | |
1172 | } | |
1173 | ||
1174 | iput(dir); | |
1175 | dir = tmp; | |
1176 | } | |
1177 | ||
1178 | iput(dir); | |
1179 | ||
1180 | return error; | |
1181 | } | |
1182 | ||
b3b94faa DT |
1183 | /** |
1184 | * gfs2_rename - Rename a file | |
1185 | * @odir: Parent directory of old file name | |
1186 | * @odentry: The old dentry of the file | |
1187 | * @ndir: Parent directory of new file name | |
1188 | * @ndentry: The new dentry of the file | |
1189 | * | |
1190 | * Returns: errno | |
1191 | */ | |
1192 | ||
1193 | static int gfs2_rename(struct inode *odir, struct dentry *odentry, | |
1194 | struct inode *ndir, struct dentry *ndentry) | |
1195 | { | |
feaa7bba SW |
1196 | struct gfs2_inode *odip = GFS2_I(odir); |
1197 | struct gfs2_inode *ndip = GFS2_I(ndir); | |
1198 | struct gfs2_inode *ip = GFS2_I(odentry->d_inode); | |
b3b94faa | 1199 | struct gfs2_inode *nip = NULL; |
feaa7bba | 1200 | struct gfs2_sbd *sdp = GFS2_SB(odir); |
8339ee54 | 1201 | struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; |
ddee7608 | 1202 | struct gfs2_rgrpd *nrgd; |
b3b94faa DT |
1203 | unsigned int num_gh; |
1204 | int dir_rename = 0; | |
24b977b5 | 1205 | int alloc_required = 0; |
b3b94faa DT |
1206 | unsigned int x; |
1207 | int error; | |
1208 | ||
b3b94faa | 1209 | if (ndentry->d_inode) { |
feaa7bba | 1210 | nip = GFS2_I(ndentry->d_inode); |
b3b94faa DT |
1211 | if (ip == nip) |
1212 | return 0; | |
1213 | } | |
1214 | ||
5e2f7d61 BP |
1215 | error = gfs2_rindex_update(sdp); |
1216 | if (error) | |
1217 | return error; | |
1218 | ||
0a305e49 BP |
1219 | error = gfs2_rs_alloc(ndip); |
1220 | if (error) | |
1221 | return error; | |
1222 | ||
0188d6c5 SW |
1223 | if (odip != ndip) { |
1224 | error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, | |
1225 | 0, &r_gh); | |
b3b94faa DT |
1226 | if (error) |
1227 | goto out; | |
1228 | ||
0188d6c5 SW |
1229 | if (S_ISDIR(ip->i_inode.i_mode)) { |
1230 | dir_rename = 1; | |
1231 | /* don't move a dirctory into it's subdir */ | |
1232 | error = gfs2_ok_to_move(ip, ndip); | |
1233 | if (error) | |
1234 | goto out_gunlock_r; | |
1235 | } | |
b3b94faa DT |
1236 | } |
1237 | ||
d9d1ca30 | 1238 | num_gh = 1; |
b3b94faa | 1239 | gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
d9d1ca30 SW |
1240 | if (odip != ndip) { |
1241 | gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1242 | num_gh++; | |
1243 | } | |
1244 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1245 | num_gh++; | |
b3b94faa | 1246 | |
d9d1ca30 SW |
1247 | if (nip) { |
1248 | gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1249 | num_gh++; | |
ddee7608 RC |
1250 | /* grab the resource lock for unlink flag twiddling |
1251 | * this is the case of the target file already existing | |
1252 | * so we unlink before doing the rename | |
1253 | */ | |
66fc061b | 1254 | nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); |
ddee7608 RC |
1255 | if (nrgd) |
1256 | gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); | |
d9d1ca30 | 1257 | } |
b3b94faa | 1258 | |
72dbf479 BP |
1259 | for (x = 0; x < num_gh; x++) { |
1260 | error = gfs2_glock_nq(ghs + x); | |
1261 | if (error) | |
1262 | goto out_gunlock; | |
1263 | } | |
b3b94faa | 1264 | |
d192a8e5 SW |
1265 | error = -ENOENT; |
1266 | if (ip->i_inode.i_nlink == 0) | |
1267 | goto out_gunlock; | |
1268 | ||
b3b94faa DT |
1269 | /* Check out the old directory */ |
1270 | ||
1271 | error = gfs2_unlink_ok(odip, &odentry->d_name, ip); | |
1272 | if (error) | |
1273 | goto out_gunlock; | |
1274 | ||
1275 | /* Check out the new directory */ | |
1276 | ||
1277 | if (nip) { | |
1278 | error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); | |
1279 | if (error) | |
1280 | goto out_gunlock; | |
1281 | ||
d192a8e5 SW |
1282 | if (nip->i_inode.i_nlink == 0) { |
1283 | error = -EAGAIN; | |
1284 | goto out_gunlock; | |
1285 | } | |
1286 | ||
b60623c2 | 1287 | if (S_ISDIR(nip->i_inode.i_mode)) { |
ad6203f2 | 1288 | if (nip->i_entries < 2) { |
94fb763b | 1289 | gfs2_consist_inode(nip); |
b3b94faa DT |
1290 | error = -EIO; |
1291 | goto out_gunlock; | |
1292 | } | |
ad6203f2 | 1293 | if (nip->i_entries > 2) { |
b3b94faa DT |
1294 | error = -ENOTEMPTY; |
1295 | goto out_gunlock; | |
1296 | } | |
1297 | } | |
1298 | } else { | |
10556cb2 | 1299 | error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); |
b3b94faa DT |
1300 | if (error) |
1301 | goto out_gunlock; | |
1302 | ||
dbb7cae2 | 1303 | error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); |
b3b94faa DT |
1304 | switch (error) { |
1305 | case -ENOENT: | |
1306 | error = 0; | |
1307 | break; | |
1308 | case 0: | |
1309 | error = -EEXIST; | |
1310 | default: | |
1311 | goto out_gunlock; | |
1312 | }; | |
1313 | ||
1314 | if (odip != ndip) { | |
4f56110a | 1315 | if (!ndip->i_inode.i_nlink) { |
d192a8e5 | 1316 | error = -ENOENT; |
b3b94faa DT |
1317 | goto out_gunlock; |
1318 | } | |
ad6203f2 | 1319 | if (ndip->i_entries == (u32)-1) { |
b3b94faa DT |
1320 | error = -EFBIG; |
1321 | goto out_gunlock; | |
1322 | } | |
b60623c2 | 1323 | if (S_ISDIR(ip->i_inode.i_mode) && |
4f56110a | 1324 | ndip->i_inode.i_nlink == (u32)-1) { |
b3b94faa DT |
1325 | error = -EMLINK; |
1326 | goto out_gunlock; | |
1327 | } | |
1328 | } | |
1329 | } | |
1330 | ||
1331 | /* Check out the dir to be renamed */ | |
1332 | ||
1333 | if (dir_rename) { | |
10556cb2 | 1334 | error = gfs2_permission(odentry->d_inode, MAY_WRITE); |
b3b94faa DT |
1335 | if (error) |
1336 | goto out_gunlock; | |
1337 | } | |
1338 | ||
24b977b5 SW |
1339 | if (nip == NULL) |
1340 | alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); | |
1341 | error = alloc_required; | |
c752666c | 1342 | if (error < 0) |
b3b94faa DT |
1343 | goto out_gunlock; |
1344 | ||
1345 | if (alloc_required) { | |
d82661d9 | 1346 | error = gfs2_quota_lock_check(ndip); |
b3b94faa | 1347 | if (error) |
5407e242 | 1348 | goto out_gunlock; |
b3b94faa | 1349 | |
9dbe9610 | 1350 | error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres, 0); |
b3b94faa DT |
1351 | if (error) |
1352 | goto out_gunlock_q; | |
1353 | ||
fe1bdedc | 1354 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
71f890f7 | 1355 | gfs2_rg_blocks(ndip, sdp->sd_max_dirres) + |
b3b94faa | 1356 | 4 * RES_DINODE + 4 * RES_LEAF + |
87d21e07 | 1357 | RES_STATFS + RES_QUOTA + 4, 0); |
b3b94faa DT |
1358 | if (error) |
1359 | goto out_ipreserv; | |
1360 | } else { | |
1361 | error = gfs2_trans_begin(sdp, 4 * RES_DINODE + | |
87d21e07 | 1362 | 5 * RES_LEAF + 4, 0); |
b3b94faa DT |
1363 | if (error) |
1364 | goto out_gunlock; | |
1365 | } | |
1366 | ||
1367 | /* Remove the target file, if it exists */ | |
1368 | ||
4327a9bf BP |
1369 | if (nip) |
1370 | error = gfs2_unlink_inode(ndip, ndentry); | |
b3b94faa DT |
1371 | |
1372 | if (dir_rename) { | |
8d123585 | 1373 | error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); |
b3b94faa DT |
1374 | if (error) |
1375 | goto out_end_trans; | |
1376 | } else { | |
1377 | struct buffer_head *dibh; | |
1378 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1379 | if (error) | |
1380 | goto out_end_trans; | |
4bd91ba1 | 1381 | ip->i_inode.i_ctime = CURRENT_TIME; |
350a9b0a | 1382 | gfs2_trans_add_meta(ip->i_gl, dibh); |
539e5d6b | 1383 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1384 | brelse(dibh); |
1385 | } | |
1386 | ||
855d23ce | 1387 | error = gfs2_dir_del(odip, odentry); |
b3b94faa DT |
1388 | if (error) |
1389 | goto out_end_trans; | |
1390 | ||
3d6ecb7d | 1391 | error = gfs2_dir_add(ndir, &ndentry->d_name, ip); |
b3b94faa DT |
1392 | if (error) |
1393 | goto out_end_trans; | |
1394 | ||
feaa7bba | 1395 | out_end_trans: |
b3b94faa | 1396 | gfs2_trans_end(sdp); |
feaa7bba | 1397 | out_ipreserv: |
b3b94faa DT |
1398 | if (alloc_required) |
1399 | gfs2_inplace_release(ndip); | |
feaa7bba | 1400 | out_gunlock_q: |
b3b94faa DT |
1401 | if (alloc_required) |
1402 | gfs2_quota_unlock(ndip); | |
feaa7bba | 1403 | out_gunlock: |
72dbf479 BP |
1404 | while (x--) { |
1405 | gfs2_glock_dq(ghs + x); | |
b3b94faa | 1406 | gfs2_holder_uninit(ghs + x); |
72dbf479 | 1407 | } |
feaa7bba | 1408 | out_gunlock_r: |
0188d6c5 | 1409 | if (r_gh.gh_gl) |
b3b94faa | 1410 | gfs2_glock_dq_uninit(&r_gh); |
feaa7bba | 1411 | out: |
b3b94faa DT |
1412 | return error; |
1413 | } | |
1414 | ||
536baf02 | 1415 | /** |
c177c2ac AV |
1416 | * gfs2_follow_link - Follow a symbolic link |
1417 | * @dentry: The dentry of the link | |
1418 | * @nd: Data that we pass to vfs_follow_link() | |
536baf02 | 1419 | * |
c177c2ac | 1420 | * This can handle symlinks of any size. |
536baf02 | 1421 | * |
c177c2ac | 1422 | * Returns: 0 on success or error code |
536baf02 SW |
1423 | */ |
1424 | ||
c177c2ac | 1425 | static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) |
536baf02 | 1426 | { |
c177c2ac | 1427 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); |
536baf02 SW |
1428 | struct gfs2_holder i_gh; |
1429 | struct buffer_head *dibh; | |
160b4026 | 1430 | unsigned int size; |
c177c2ac | 1431 | char *buf; |
536baf02 SW |
1432 | int error; |
1433 | ||
1434 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); | |
1435 | error = gfs2_glock_nq(&i_gh); | |
1436 | if (error) { | |
1437 | gfs2_holder_uninit(&i_gh); | |
c177c2ac AV |
1438 | nd_set_link(nd, ERR_PTR(error)); |
1439 | return NULL; | |
536baf02 SW |
1440 | } |
1441 | ||
a2e0f799 SW |
1442 | size = (unsigned int)i_size_read(&ip->i_inode); |
1443 | if (size == 0) { | |
536baf02 | 1444 | gfs2_consist_inode(ip); |
c177c2ac | 1445 | buf = ERR_PTR(-EIO); |
536baf02 SW |
1446 | goto out; |
1447 | } | |
1448 | ||
1449 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
c177c2ac AV |
1450 | if (error) { |
1451 | buf = ERR_PTR(error); | |
536baf02 | 1452 | goto out; |
536baf02 SW |
1453 | } |
1454 | ||
160b4026 | 1455 | buf = kzalloc(size + 1, GFP_NOFS); |
c177c2ac AV |
1456 | if (!buf) |
1457 | buf = ERR_PTR(-ENOMEM); | |
1458 | else | |
160b4026 | 1459 | memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); |
536baf02 SW |
1460 | brelse(dibh); |
1461 | out: | |
1462 | gfs2_glock_dq_uninit(&i_gh); | |
c177c2ac AV |
1463 | nd_set_link(nd, buf); |
1464 | return NULL; | |
b3b94faa DT |
1465 | } |
1466 | ||
c177c2ac | 1467 | static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
b3b94faa | 1468 | { |
c177c2ac AV |
1469 | char *s = nd_get_link(nd); |
1470 | if (!IS_ERR(s)) | |
1471 | kfree(s); | |
b3b94faa DT |
1472 | } |
1473 | ||
1474 | /** | |
1475 | * gfs2_permission - | |
75d5cfbe SW |
1476 | * @inode: The inode |
1477 | * @mask: The mask to be tested | |
1478 | * @flags: Indicates whether this is an RCU path walk or not | |
b3b94faa | 1479 | * |
300c7d75 SW |
1480 | * This may be called from the VFS directly, or from within GFS2 with the |
1481 | * inode locked, so we look to see if the glock is already locked and only | |
1482 | * lock the glock if its not already been done. | |
1483 | * | |
b3b94faa DT |
1484 | * Returns: errno |
1485 | */ | |
1486 | ||
10556cb2 | 1487 | int gfs2_permission(struct inode *inode, int mask) |
b3b94faa | 1488 | { |
b74c79e9 | 1489 | struct gfs2_inode *ip; |
b3b94faa DT |
1490 | struct gfs2_holder i_gh; |
1491 | int error; | |
300c7d75 | 1492 | int unlock = 0; |
b3b94faa | 1493 | |
b74c79e9 NP |
1494 | |
1495 | ip = GFS2_I(inode); | |
7afd88d9 | 1496 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
10556cb2 | 1497 | if (mask & MAY_NOT_BLOCK) |
75d5cfbe | 1498 | return -ECHILD; |
300c7d75 SW |
1499 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
1500 | if (error) | |
1501 | return error; | |
1502 | unlock = 1; | |
1503 | } | |
b3b94faa | 1504 | |
f58ba889 MS |
1505 | if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) |
1506 | error = -EACCES; | |
1507 | else | |
2830ba7f | 1508 | error = generic_permission(inode, mask); |
300c7d75 | 1509 | if (unlock) |
b3b94faa | 1510 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1511 | |
1512 | return error; | |
1513 | } | |
1514 | ||
ab9bbda0 | 1515 | static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) |
194c011f | 1516 | { |
194c011f SW |
1517 | setattr_copy(inode, attr); |
1518 | mark_inode_dirty(inode); | |
194c011f SW |
1519 | return 0; |
1520 | } | |
1521 | ||
1522 | /** | |
1523 | * gfs2_setattr_simple - | |
1524 | * @ip: | |
1525 | * @attr: | |
1526 | * | |
1527 | * Returns: errno | |
1528 | */ | |
1529 | ||
ab9bbda0 | 1530 | int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) |
194c011f SW |
1531 | { |
1532 | int error; | |
1533 | ||
1534 | if (current->journal_info) | |
ab9bbda0 | 1535 | return __gfs2_setattr_simple(inode, attr); |
194c011f | 1536 | |
ab9bbda0 | 1537 | error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); |
194c011f SW |
1538 | if (error) |
1539 | return error; | |
1540 | ||
ab9bbda0 SW |
1541 | error = __gfs2_setattr_simple(inode, attr); |
1542 | gfs2_trans_end(GFS2_SB(inode)); | |
194c011f SW |
1543 | return error; |
1544 | } | |
1545 | ||
b3b94faa DT |
1546 | static int setattr_chown(struct inode *inode, struct iattr *attr) |
1547 | { | |
feaa7bba SW |
1548 | struct gfs2_inode *ip = GFS2_I(inode); |
1549 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
7c06b5d6 EB |
1550 | kuid_t ouid, nuid; |
1551 | kgid_t ogid, ngid; | |
b3b94faa DT |
1552 | int error; |
1553 | ||
2933f925 SW |
1554 | ouid = inode->i_uid; |
1555 | ogid = inode->i_gid; | |
b3b94faa DT |
1556 | nuid = attr->ia_uid; |
1557 | ngid = attr->ia_gid; | |
1558 | ||
6b24c0d2 | 1559 | if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) |
f4108a60 | 1560 | ouid = nuid = NO_UID_QUOTA_CHANGE; |
6b24c0d2 | 1561 | if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) |
f4108a60 | 1562 | ogid = ngid = NO_GID_QUOTA_CHANGE; |
b3b94faa | 1563 | |
b3b94faa DT |
1564 | error = gfs2_quota_lock(ip, nuid, ngid); |
1565 | if (error) | |
5407e242 | 1566 | return error; |
b3b94faa | 1567 | |
6b24c0d2 EB |
1568 | if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || |
1569 | !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { | |
b3b94faa DT |
1570 | error = gfs2_quota_check(ip, nuid, ngid); |
1571 | if (error) | |
1572 | goto out_gunlock_q; | |
1573 | } | |
1574 | ||
1575 | error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); | |
1576 | if (error) | |
1577 | goto out_gunlock_q; | |
1578 | ||
ab9bbda0 | 1579 | error = gfs2_setattr_simple(inode, attr); |
b3b94faa DT |
1580 | if (error) |
1581 | goto out_end_trans; | |
1582 | ||
6b24c0d2 EB |
1583 | if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || |
1584 | !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { | |
77658aad SW |
1585 | u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); |
1586 | gfs2_quota_change(ip, -blocks, ouid, ogid); | |
1587 | gfs2_quota_change(ip, blocks, nuid, ngid); | |
b3b94faa DT |
1588 | } |
1589 | ||
a91ea69f | 1590 | out_end_trans: |
b3b94faa | 1591 | gfs2_trans_end(sdp); |
a91ea69f | 1592 | out_gunlock_q: |
b3b94faa | 1593 | gfs2_quota_unlock(ip); |
b3b94faa DT |
1594 | return error; |
1595 | } | |
1596 | ||
1597 | /** | |
1598 | * gfs2_setattr - Change attributes on an inode | |
1599 | * @dentry: The dentry which is changing | |
1600 | * @attr: The structure describing the change | |
1601 | * | |
1602 | * The VFS layer wants to change one or more of an inodes attributes. Write | |
1603 | * that change out to disk. | |
1604 | * | |
1605 | * Returns: errno | |
1606 | */ | |
1607 | ||
1608 | static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) | |
1609 | { | |
1610 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1611 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1612 | struct gfs2_holder i_gh; |
1613 | int error; | |
1614 | ||
0a305e49 BP |
1615 | error = gfs2_rs_alloc(ip); |
1616 | if (error) | |
1617 | return error; | |
1618 | ||
b3b94faa DT |
1619 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); |
1620 | if (error) | |
1621 | return error; | |
1622 | ||
1623 | error = -EPERM; | |
1624 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
1625 | goto out; | |
1626 | ||
1627 | error = inode_change_ok(inode, attr); | |
1628 | if (error) | |
1629 | goto out; | |
1630 | ||
1631 | if (attr->ia_valid & ATTR_SIZE) | |
ff8f33c8 | 1632 | error = gfs2_setattr_size(inode, attr->ia_size); |
b3b94faa DT |
1633 | else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) |
1634 | error = setattr_chown(inode, attr); | |
1635 | else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) | |
1636 | error = gfs2_acl_chmod(ip, attr); | |
1637 | else | |
ab9bbda0 | 1638 | error = gfs2_setattr_simple(inode, attr); |
b3b94faa | 1639 | |
a91ea69f | 1640 | out: |
b3b94faa DT |
1641 | if (!error) |
1642 | mark_inode_dirty(inode); | |
ab9bbda0 | 1643 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1644 | return error; |
1645 | } | |
1646 | ||
1647 | /** | |
1648 | * gfs2_getattr - Read out an inode's attributes | |
26c1a574 | 1649 | * @mnt: The vfsmount the inode is being accessed from |
b3b94faa DT |
1650 | * @dentry: The dentry to stat |
1651 | * @stat: The inode's stats | |
1652 | * | |
dcf3dd85 SW |
1653 | * This may be called from the VFS directly, or from within GFS2 with the |
1654 | * inode locked, so we look to see if the glock is already locked and only | |
1655 | * lock the glock if its not already been done. Note that its the NFS | |
1656 | * readdirplus operation which causes this to be called (from filldir) | |
1657 | * with the glock already held. | |
1658 | * | |
b3b94faa DT |
1659 | * Returns: errno |
1660 | */ | |
1661 | ||
1662 | static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
1663 | struct kstat *stat) | |
1664 | { | |
1665 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1666 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1667 | struct gfs2_holder gh; |
1668 | int error; | |
dcf3dd85 | 1669 | int unlock = 0; |
b3b94faa | 1670 | |
7afd88d9 | 1671 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
dcf3dd85 SW |
1672 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1673 | if (error) | |
1674 | return error; | |
1675 | unlock = 1; | |
b3b94faa DT |
1676 | } |
1677 | ||
dcf3dd85 | 1678 | generic_fillattr(inode, stat); |
d7c103d0 | 1679 | if (unlock) |
dcf3dd85 SW |
1680 | gfs2_glock_dq_uninit(&gh); |
1681 | ||
1682 | return 0; | |
b3b94faa DT |
1683 | } |
1684 | ||
1685 | static int gfs2_setxattr(struct dentry *dentry, const char *name, | |
1686 | const void *data, size_t size, int flags) | |
1687 | { | |
feaa7bba | 1688 | struct inode *inode = dentry->d_inode; |
40b78a32 SW |
1689 | struct gfs2_inode *ip = GFS2_I(inode); |
1690 | struct gfs2_holder gh; | |
1691 | int ret; | |
b3b94faa | 1692 | |
40b78a32 SW |
1693 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
1694 | ret = gfs2_glock_nq(&gh); | |
1695 | if (ret == 0) { | |
645b2ccc SW |
1696 | ret = gfs2_rs_alloc(ip); |
1697 | if (ret == 0) | |
1698 | ret = generic_setxattr(dentry, name, data, size, flags); | |
40b78a32 SW |
1699 | gfs2_glock_dq(&gh); |
1700 | } | |
1701 | gfs2_holder_uninit(&gh); | |
1702 | return ret; | |
b3b94faa DT |
1703 | } |
1704 | ||
1705 | static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, | |
1706 | void *data, size_t size) | |
1707 | { | |
40b78a32 SW |
1708 | struct inode *inode = dentry->d_inode; |
1709 | struct gfs2_inode *ip = GFS2_I(inode); | |
1710 | struct gfs2_holder gh; | |
1711 | int ret; | |
b3b94faa | 1712 | |
40b78a32 SW |
1713 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1714 | ret = gfs2_glock_nq(&gh); | |
1715 | if (ret == 0) { | |
1716 | ret = generic_getxattr(dentry, name, data, size); | |
1717 | gfs2_glock_dq(&gh); | |
1718 | } | |
1719 | gfs2_holder_uninit(&gh); | |
1720 | return ret; | |
b3b94faa DT |
1721 | } |
1722 | ||
1723 | static int gfs2_removexattr(struct dentry *dentry, const char *name) | |
1724 | { | |
40b78a32 SW |
1725 | struct inode *inode = dentry->d_inode; |
1726 | struct gfs2_inode *ip = GFS2_I(inode); | |
1727 | struct gfs2_holder gh; | |
1728 | int ret; | |
b3b94faa | 1729 | |
40b78a32 SW |
1730 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
1731 | ret = gfs2_glock_nq(&gh); | |
1732 | if (ret == 0) { | |
645b2ccc SW |
1733 | ret = gfs2_rs_alloc(ip); |
1734 | if (ret == 0) | |
1735 | ret = generic_removexattr(dentry, name); | |
40b78a32 SW |
1736 | gfs2_glock_dq(&gh); |
1737 | } | |
1738 | gfs2_holder_uninit(&gh); | |
1739 | return ret; | |
b3b94faa DT |
1740 | } |
1741 | ||
e9079cce SW |
1742 | static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
1743 | u64 start, u64 len) | |
1744 | { | |
1745 | struct gfs2_inode *ip = GFS2_I(inode); | |
1746 | struct gfs2_holder gh; | |
1747 | int ret; | |
1748 | ||
1749 | ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); | |
1750 | if (ret) | |
1751 | return ret; | |
1752 | ||
1753 | mutex_lock(&inode->i_mutex); | |
1754 | ||
1755 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); | |
1756 | if (ret) | |
1757 | goto out; | |
1758 | ||
1759 | if (gfs2_is_stuffed(ip)) { | |
1760 | u64 phys = ip->i_no_addr << inode->i_blkbits; | |
1761 | u64 size = i_size_read(inode); | |
1762 | u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| | |
1763 | FIEMAP_EXTENT_DATA_INLINE; | |
1764 | phys += sizeof(struct gfs2_dinode); | |
1765 | phys += start; | |
1766 | if (start + len > size) | |
1767 | len = size - start; | |
1768 | if (start < size) | |
1769 | ret = fiemap_fill_next_extent(fieinfo, start, phys, | |
1770 | len, flags); | |
1771 | if (ret == 1) | |
1772 | ret = 0; | |
1773 | } else { | |
1774 | ret = __generic_block_fiemap(inode, fieinfo, start, len, | |
1775 | gfs2_block_map); | |
1776 | } | |
1777 | ||
1778 | gfs2_glock_dq_uninit(&gh); | |
1779 | out: | |
1780 | mutex_unlock(&inode->i_mutex); | |
1781 | return ret; | |
1782 | } | |
1783 | ||
92e1d5be | 1784 | const struct inode_operations gfs2_file_iops = { |
e6305c43 | 1785 | .permission = gfs2_permission, |
b3b94faa DT |
1786 | .setattr = gfs2_setattr, |
1787 | .getattr = gfs2_getattr, | |
1788 | .setxattr = gfs2_setxattr, | |
1789 | .getxattr = gfs2_getxattr, | |
1790 | .listxattr = gfs2_listxattr, | |
1791 | .removexattr = gfs2_removexattr, | |
e9079cce | 1792 | .fiemap = gfs2_fiemap, |
4e34e719 | 1793 | .get_acl = gfs2_get_acl, |
b3b94faa DT |
1794 | }; |
1795 | ||
92e1d5be | 1796 | const struct inode_operations gfs2_dir_iops = { |
b3b94faa DT |
1797 | .create = gfs2_create, |
1798 | .lookup = gfs2_lookup, | |
1799 | .link = gfs2_link, | |
1800 | .unlink = gfs2_unlink, | |
1801 | .symlink = gfs2_symlink, | |
1802 | .mkdir = gfs2_mkdir, | |
855d23ce | 1803 | .rmdir = gfs2_unlink, |
b3b94faa DT |
1804 | .mknod = gfs2_mknod, |
1805 | .rename = gfs2_rename, | |
e6305c43 | 1806 | .permission = gfs2_permission, |
b3b94faa DT |
1807 | .setattr = gfs2_setattr, |
1808 | .getattr = gfs2_getattr, | |
1809 | .setxattr = gfs2_setxattr, | |
1810 | .getxattr = gfs2_getxattr, | |
1811 | .listxattr = gfs2_listxattr, | |
1812 | .removexattr = gfs2_removexattr, | |
e9079cce | 1813 | .fiemap = gfs2_fiemap, |
4e34e719 | 1814 | .get_acl = gfs2_get_acl, |
b3b94faa DT |
1815 | }; |
1816 | ||
92e1d5be | 1817 | const struct inode_operations gfs2_symlink_iops = { |
c177c2ac | 1818 | .readlink = generic_readlink, |
b3b94faa | 1819 | .follow_link = gfs2_follow_link, |
c177c2ac | 1820 | .put_link = gfs2_put_link, |
e6305c43 | 1821 | .permission = gfs2_permission, |
b3b94faa DT |
1822 | .setattr = gfs2_setattr, |
1823 | .getattr = gfs2_getattr, | |
1824 | .setxattr = gfs2_setxattr, | |
1825 | .getxattr = gfs2_getxattr, | |
1826 | .listxattr = gfs2_listxattr, | |
1827 | .removexattr = gfs2_removexattr, | |
e9079cce | 1828 | .fiemap = gfs2_fiemap, |
4e34e719 | 1829 | .get_acl = gfs2_get_acl, |
b3b94faa DT |
1830 | }; |
1831 |