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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 | ||
175a4eb7 | 367 | static void munge_mode_uid_gid(struct gfs2_inode *dip, umode_t *mode, |
194c011f SW |
368 | unsigned int *uid, unsigned int *gid) |
369 | { | |
370 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && | |
371 | (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) { | |
372 | if (S_ISDIR(*mode)) | |
373 | *mode |= S_ISUID; | |
374 | else if (dip->i_inode.i_uid != current_fsuid()) | |
375 | *mode &= ~07111; | |
376 | *uid = dip->i_inode.i_uid; | |
377 | } else | |
378 | *uid = current_fsuid(); | |
379 | ||
380 | if (dip->i_inode.i_mode & S_ISGID) { | |
381 | if (S_ISDIR(*mode)) | |
382 | *mode |= S_ISGID; | |
383 | *gid = dip->i_inode.i_gid; | |
384 | } else | |
385 | *gid = current_fsgid(); | |
386 | } | |
387 | ||
388 | static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation) | |
389 | { | |
390 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
391 | int error; | |
6a8099ed | 392 | int dblocks = 1; |
194c011f | 393 | |
564e12b1 | 394 | error = gfs2_inplace_reserve(dip, RES_DINODE); |
194c011f SW |
395 | if (error) |
396 | goto out; | |
397 | ||
398 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); | |
399 | if (error) | |
400 | goto out_ipreserv; | |
401 | ||
6e87ed0f | 402 | error = gfs2_alloc_blocks(dip, no_addr, &dblocks, 1, generation); |
194c011f SW |
403 | |
404 | gfs2_trans_end(sdp); | |
405 | ||
406 | out_ipreserv: | |
407 | gfs2_inplace_release(dip); | |
408 | out: | |
194c011f SW |
409 | return error; |
410 | } | |
411 | ||
f2741d98 SW |
412 | static void gfs2_init_dir(struct buffer_head *dibh, |
413 | const struct gfs2_inode *parent) | |
e2d0a13b SW |
414 | { |
415 | struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; | |
416 | struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); | |
417 | ||
418 | gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); | |
419 | dent->de_inum = di->di_num; /* already GFS2 endian */ | |
420 | dent->de_type = cpu_to_be16(DT_DIR); | |
421 | ||
422 | dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); | |
423 | gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); | |
424 | gfs2_inum_out(parent, dent); | |
425 | dent->de_type = cpu_to_be16(DT_DIR); | |
426 | ||
427 | } | |
428 | ||
194c011f SW |
429 | /** |
430 | * init_dinode - Fill in a new dinode structure | |
f2741d98 | 431 | * @dip: The directory this inode is being created in |
194c011f | 432 | * @gl: The glock covering the new inode |
f2741d98 SW |
433 | * @inum: The inode number |
434 | * @mode: The file permissions | |
435 | * @uid: The uid of the new inode | |
436 | * @gid: The gid of the new inode | |
437 | * @generation: The generation number of the new inode | |
438 | * @dev: The device number (if a device node) | |
439 | * @symname: The symlink destination (if a symlink) | |
440 | * @size: The inode size (ignored for directories) | |
441 | * @bhp: The buffer head (returned to caller) | |
194c011f SW |
442 | * |
443 | */ | |
444 | ||
445 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
175a4eb7 | 446 | const struct gfs2_inum_host *inum, umode_t mode, |
194c011f | 447 | unsigned int uid, unsigned int gid, |
160b4026 SW |
448 | const u64 *generation, dev_t dev, const char *symname, |
449 | unsigned size, 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; | |
454 | struct timespec tv = CURRENT_TIME; | |
455 | ||
456 | dibh = gfs2_meta_new(gl, inum->no_addr); | |
457 | gfs2_trans_add_bh(gl, dibh, 1); | |
458 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); | |
459 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); | |
460 | di = (struct gfs2_dinode *)dibh->b_data; | |
461 | ||
462 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); | |
463 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); | |
464 | di->di_mode = cpu_to_be32(mode); | |
465 | di->di_uid = cpu_to_be32(uid); | |
466 | di->di_gid = cpu_to_be32(gid); | |
467 | di->di_nlink = 0; | |
160b4026 | 468 | di->di_size = cpu_to_be64(size); |
194c011f SW |
469 | di->di_blocks = cpu_to_be64(1); |
470 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec); | |
471 | di->di_major = cpu_to_be32(MAJOR(dev)); | |
472 | di->di_minor = cpu_to_be32(MINOR(dev)); | |
473 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); | |
474 | di->di_generation = cpu_to_be64(*generation); | |
475 | di->di_flags = 0; | |
194c011f SW |
476 | di->__pad1 = 0; |
477 | di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0); | |
478 | di->di_height = 0; | |
479 | di->__pad2 = 0; | |
480 | di->__pad3 = 0; | |
481 | di->di_depth = 0; | |
482 | di->di_entries = 0; | |
483 | memset(&di->__pad4, 0, sizeof(di->__pad4)); | |
484 | di->di_eattr = 0; | |
485 | di->di_atime_nsec = cpu_to_be32(tv.tv_nsec); | |
486 | di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec); | |
487 | di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec); | |
488 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); | |
160b4026 SW |
489 | |
490 | switch(mode & S_IFMT) { | |
491 | case S_IFREG: | |
e2d0a13b SW |
492 | if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || |
493 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
494 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); | |
160b4026 SW |
495 | break; |
496 | case S_IFDIR: | |
e2d0a13b SW |
497 | di->di_flags |= cpu_to_be32(dip->i_diskflags & |
498 | GFS2_DIF_INHERIT_JDATA); | |
499 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); | |
500 | di->di_size = cpu_to_be64(sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)); | |
501 | di->di_entries = cpu_to_be32(2); | |
502 | gfs2_init_dir(dibh, dip); | |
160b4026 SW |
503 | break; |
504 | case S_IFLNK: | |
505 | memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, size); | |
506 | break; | |
e2d0a13b SW |
507 | } |
508 | ||
194c011f SW |
509 | set_buffer_uptodate(dibh); |
510 | ||
511 | *bhp = dibh; | |
512 | } | |
513 | ||
514 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, | |
175a4eb7 | 515 | umode_t mode, const struct gfs2_inum_host *inum, |
160b4026 SW |
516 | const u64 *generation, dev_t dev, const char *symname, |
517 | unsigned int size, struct buffer_head **bhp) | |
194c011f SW |
518 | { |
519 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
520 | unsigned int uid, gid; | |
521 | int error; | |
522 | ||
523 | munge_mode_uid_gid(dip, &mode, &uid, &gid); | |
8e2e0047 BP |
524 | error = gfs2_rindex_update(sdp); |
525 | if (error) | |
526 | return error; | |
194c011f SW |
527 | |
528 | error = gfs2_quota_lock(dip, uid, gid); | |
529 | if (error) | |
5407e242 | 530 | return error; |
194c011f SW |
531 | |
532 | error = gfs2_quota_check(dip, uid, gid); | |
533 | if (error) | |
534 | goto out_quota; | |
535 | ||
536 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); | |
537 | if (error) | |
538 | goto out_quota; | |
539 | ||
160b4026 | 540 | init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, symname, size, bhp); |
194c011f SW |
541 | gfs2_quota_change(dip, +1, uid, gid); |
542 | gfs2_trans_end(sdp); | |
543 | ||
544 | out_quota: | |
545 | gfs2_quota_unlock(dip); | |
194c011f SW |
546 | return error; |
547 | } | |
548 | ||
549 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, | |
550 | struct gfs2_inode *ip) | |
551 | { | |
552 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
194c011f SW |
553 | int alloc_required; |
554 | struct buffer_head *dibh; | |
555 | int error; | |
556 | ||
8e2e0047 BP |
557 | error = gfs2_rindex_update(sdp); |
558 | if (error) | |
559 | return error; | |
194c011f SW |
560 | |
561 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); | |
562 | if (error) | |
563 | goto fail; | |
564 | ||
565 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); | |
566 | if (alloc_required < 0) | |
567 | goto fail_quota_locks; | |
568 | if (alloc_required) { | |
569 | error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); | |
570 | if (error) | |
571 | goto fail_quota_locks; | |
572 | ||
564e12b1 | 573 | error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres); |
194c011f SW |
574 | if (error) |
575 | goto fail_quota_locks; | |
576 | ||
577 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + | |
54335b1f | 578 | dip->i_rgd->rd_length + |
194c011f SW |
579 | 2 * RES_DINODE + |
580 | RES_STATFS + RES_QUOTA, 0); | |
581 | if (error) | |
582 | goto fail_ipreserv; | |
583 | } else { | |
584 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); | |
585 | if (error) | |
586 | goto fail_quota_locks; | |
587 | } | |
588 | ||
589 | error = gfs2_dir_add(&dip->i_inode, name, ip); | |
590 | if (error) | |
591 | goto fail_end_trans; | |
592 | ||
593 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
594 | if (error) | |
595 | goto fail_end_trans; | |
66ad863b | 596 | set_nlink(&ip->i_inode, S_ISDIR(ip->i_inode.i_mode) ? 2 : 1); |
194c011f SW |
597 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
598 | gfs2_dinode_out(ip, dibh->b_data); | |
599 | brelse(dibh); | |
600 | return 0; | |
601 | ||
602 | fail_end_trans: | |
603 | gfs2_trans_end(sdp); | |
604 | ||
605 | fail_ipreserv: | |
8e2e0047 BP |
606 | if (alloc_required) |
607 | gfs2_inplace_release(dip); | |
194c011f SW |
608 | |
609 | fail_quota_locks: | |
610 | gfs2_quota_unlock(dip); | |
611 | ||
612 | fail: | |
194c011f SW |
613 | return error; |
614 | } | |
615 | ||
46cc1e5f | 616 | static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, |
9d8f13ba | 617 | void *fs_info) |
194c011f | 618 | { |
9d8f13ba MZ |
619 | const struct xattr *xattr; |
620 | int err = 0; | |
621 | ||
622 | for (xattr = xattr_array; xattr->name != NULL; xattr++) { | |
623 | err = __gfs2_xattr_set(inode, xattr->name, xattr->value, | |
624 | xattr->value_len, 0, | |
625 | GFS2_EATYPE_SECURITY); | |
626 | if (err < 0) | |
627 | break; | |
194c011f | 628 | } |
194c011f SW |
629 | return err; |
630 | } | |
b3b94faa | 631 | |
9d8f13ba MZ |
632 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, |
633 | const struct qstr *qstr) | |
634 | { | |
635 | return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, | |
636 | &gfs2_initxattrs, NULL); | |
637 | } | |
638 | ||
194c011f | 639 | /** |
f2741d98 SW |
640 | * gfs2_create_inode - Create a new inode |
641 | * @dir: The parent directory | |
642 | * @dentry: The new dentry | |
643 | * @mode: The permissions on the new inode | |
644 | * @dev: For device nodes, this is the device number | |
645 | * @symname: For symlinks, this is the link destination | |
646 | * @size: The initial size of the inode (ignored for directories) | |
194c011f | 647 | * |
f2741d98 | 648 | * Returns: 0 on success, or error code |
194c011f SW |
649 | */ |
650 | ||
f2741d98 | 651 | static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, |
175a4eb7 | 652 | umode_t mode, dev_t dev, const char *symname, |
9a63edd1 | 653 | unsigned int size, int excl) |
194c011f | 654 | { |
f2741d98 SW |
655 | const struct qstr *name = &dentry->d_name; |
656 | struct gfs2_holder ghs[2]; | |
194c011f | 657 | struct inode *inode = NULL; |
8e2e0047 | 658 | struct gfs2_inode *dip = GFS2_I(dir), *ip; |
194c011f SW |
659 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
660 | struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 }; | |
661 | int error; | |
662 | u64 generation; | |
663 | struct buffer_head *bh = NULL; | |
664 | ||
665 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
f2741d98 | 666 | return -ENAMETOOLONG; |
194c011f | 667 | |
8e2e0047 BP |
668 | /* We need a reservation to allocate the new dinode block. The |
669 | directory ip temporarily points to the reservation, but this is | |
670 | being done to get a set of contiguous blocks for the new dinode. | |
671 | Since this is a create, we don't have a sizehint yet, so it will | |
672 | have to use the minimum reservation size. */ | |
0a305e49 BP |
673 | error = gfs2_rs_alloc(dip); |
674 | if (error) | |
675 | return error; | |
676 | ||
f2741d98 | 677 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
194c011f SW |
678 | if (error) |
679 | goto fail; | |
680 | ||
681 | error = create_ok(dip, name, mode); | |
9a63edd1 SW |
682 | if ((error == -EEXIST) && S_ISREG(mode) && !excl) { |
683 | inode = gfs2_lookupi(dir, &dentry->d_name, 0); | |
684 | gfs2_glock_dq_uninit(ghs); | |
685 | d_instantiate(dentry, inode); | |
686 | return IS_ERR(inode) ? PTR_ERR(inode) : 0; | |
687 | } | |
194c011f SW |
688 | if (error) |
689 | goto fail_gunlock; | |
690 | ||
691 | error = alloc_dinode(dip, &inum.no_addr, &generation); | |
692 | if (error) | |
693 | goto fail_gunlock; | |
694 | inum.no_formal_ino = generation; | |
695 | ||
696 | error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, | |
697 | LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); | |
698 | if (error) | |
699 | goto fail_gunlock; | |
700 | ||
160b4026 | 701 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, symname, size, &bh); |
194c011f SW |
702 | if (error) |
703 | goto fail_gunlock2; | |
704 | ||
705 | inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr, | |
706 | inum.no_formal_ino, 0); | |
707 | if (IS_ERR(inode)) | |
708 | goto fail_gunlock2; | |
709 | ||
8e2e0047 BP |
710 | ip = GFS2_I(inode); |
711 | error = gfs2_inode_refresh(ip); | |
194c011f SW |
712 | if (error) |
713 | goto fail_gunlock2; | |
714 | ||
8e2e0047 BP |
715 | /* The newly created inode needs a reservation so it can allocate |
716 | xattrs. At the same time, we want new blocks allocated to the new | |
717 | dinode to be as contiguous as possible. Since we allocated the | |
718 | dinode block under the directory's reservation, we transfer | |
719 | ownership of that reservation to the new inode. The directory | |
720 | doesn't need a reservation unless it needs a new allocation. */ | |
721 | ip->i_res = dip->i_res; | |
722 | dip->i_res = NULL; | |
0a305e49 | 723 | |
194c011f SW |
724 | error = gfs2_acl_create(dip, inode); |
725 | if (error) | |
726 | goto fail_gunlock2; | |
727 | ||
8e2e0047 | 728 | error = gfs2_security_init(dip, ip, name); |
194c011f SW |
729 | if (error) |
730 | goto fail_gunlock2; | |
731 | ||
8e2e0047 | 732 | error = link_dinode(dip, name, ip); |
194c011f SW |
733 | if (error) |
734 | goto fail_gunlock2; | |
735 | ||
736 | if (bh) | |
737 | brelse(bh); | |
f2741d98 SW |
738 | |
739 | gfs2_trans_end(sdp); | |
564e12b1 BP |
740 | /* Check if we reserved space in the rgrp. Function link_dinode may |
741 | not, depending on whether alloc is required. */ | |
0a305e49 | 742 | if (gfs2_mb_reserved(dip)) |
564e12b1 | 743 | gfs2_inplace_release(dip); |
f2741d98 | 744 | gfs2_quota_unlock(dip); |
f2741d98 | 745 | mark_inode_dirty(inode); |
ab9bbda0 | 746 | gfs2_glock_dq_uninit_m(2, ghs); |
f2741d98 SW |
747 | d_instantiate(dentry, inode); |
748 | return 0; | |
194c011f SW |
749 | |
750 | fail_gunlock2: | |
751 | gfs2_glock_dq_uninit(ghs + 1); | |
194c011f | 752 | fail_gunlock: |
f2741d98 | 753 | gfs2_glock_dq_uninit(ghs); |
40ac218f SW |
754 | if (inode && !IS_ERR(inode)) { |
755 | set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags); | |
756 | iput(inode); | |
757 | } | |
194c011f | 758 | fail: |
8e2e0047 | 759 | gfs2_rs_delete(dip); |
194c011f SW |
760 | if (bh) |
761 | brelse(bh); | |
f2741d98 | 762 | return error; |
194c011f | 763 | } |
f2741d98 | 764 | |
b3b94faa DT |
765 | /** |
766 | * gfs2_create - Create a file | |
767 | * @dir: The directory in which to create the file | |
768 | * @dentry: The dentry of the new file | |
769 | * @mode: The mode of the new file | |
770 | * | |
771 | * Returns: errno | |
772 | */ | |
773 | ||
774 | static int gfs2_create(struct inode *dir, struct dentry *dentry, | |
ebfc3b49 | 775 | umode_t mode, bool excl) |
b3b94faa | 776 | { |
9a63edd1 | 777 | return gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0, excl); |
b3b94faa DT |
778 | } |
779 | ||
780 | /** | |
781 | * gfs2_lookup - Look up a filename in a directory and return its inode | |
782 | * @dir: The directory inode | |
783 | * @dentry: The dentry of the new inode | |
784 | * @nd: passed from Linux VFS, ignored by us | |
785 | * | |
786 | * Called by the VFS layer. Lock dir and call gfs2_lookupi() | |
787 | * | |
788 | * Returns: errno | |
789 | */ | |
790 | ||
791 | static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, | |
00cd8dd3 | 792 | unsigned int flags) |
b3b94faa | 793 | { |
6c673ab3 AV |
794 | struct inode *inode = gfs2_lookupi(dir, &dentry->d_name, 0); |
795 | if (inode && !IS_ERR(inode)) { | |
9656b2c1 SW |
796 | struct gfs2_glock *gl = GFS2_I(inode)->i_gl; |
797 | struct gfs2_holder gh; | |
798 | int error; | |
799 | error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); | |
800 | if (error) { | |
801 | iput(inode); | |
802 | return ERR_PTR(error); | |
803 | } | |
804 | gfs2_glock_dq_uninit(&gh); | |
9656b2c1 | 805 | } |
6c673ab3 | 806 | return d_splice_alias(inode, dentry); |
b3b94faa DT |
807 | } |
808 | ||
809 | /** | |
810 | * gfs2_link - Link to a file | |
811 | * @old_dentry: The inode to link | |
812 | * @dir: Add link to this directory | |
813 | * @dentry: The name of the link | |
814 | * | |
815 | * Link the inode in "old_dentry" into the directory "dir" with the | |
816 | * name in "dentry". | |
817 | * | |
818 | * Returns: errno | |
819 | */ | |
820 | ||
821 | static int gfs2_link(struct dentry *old_dentry, struct inode *dir, | |
822 | struct dentry *dentry) | |
823 | { | |
feaa7bba SW |
824 | struct gfs2_inode *dip = GFS2_I(dir); |
825 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa | 826 | struct inode *inode = old_dentry->d_inode; |
feaa7bba | 827 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 828 | struct gfs2_holder ghs[2]; |
2baee03f | 829 | struct buffer_head *dibh; |
b3b94faa DT |
830 | int alloc_required; |
831 | int error; | |
832 | ||
b60623c2 | 833 | if (S_ISDIR(inode->i_mode)) |
b3b94faa DT |
834 | return -EPERM; |
835 | ||
0a305e49 BP |
836 | error = gfs2_rs_alloc(dip); |
837 | if (error) | |
838 | return error; | |
839 | ||
b3b94faa DT |
840 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
841 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); | |
842 | ||
72dbf479 BP |
843 | error = gfs2_glock_nq(ghs); /* parent */ |
844 | if (error) | |
845 | goto out_parent; | |
846 | ||
847 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
b3b94faa | 848 | if (error) |
72dbf479 | 849 | goto out_child; |
b3b94faa | 850 | |
d192a8e5 SW |
851 | error = -ENOENT; |
852 | if (inode->i_nlink == 0) | |
853 | goto out_gunlock; | |
854 | ||
10556cb2 | 855 | error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); |
b3b94faa DT |
856 | if (error) |
857 | goto out_gunlock; | |
858 | ||
dbb7cae2 | 859 | error = gfs2_dir_check(dir, &dentry->d_name, NULL); |
b3b94faa DT |
860 | switch (error) { |
861 | case -ENOENT: | |
862 | break; | |
863 | case 0: | |
864 | error = -EEXIST; | |
865 | default: | |
866 | goto out_gunlock; | |
867 | } | |
868 | ||
869 | error = -EINVAL; | |
4f56110a | 870 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
871 | goto out_gunlock; |
872 | error = -EFBIG; | |
ad6203f2 | 873 | if (dip->i_entries == (u32)-1) |
b3b94faa DT |
874 | goto out_gunlock; |
875 | error = -EPERM; | |
876 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
877 | goto out_gunlock; | |
878 | error = -EINVAL; | |
4f56110a | 879 | if (!ip->i_inode.i_nlink) |
b3b94faa DT |
880 | goto out_gunlock; |
881 | error = -EMLINK; | |
4f56110a | 882 | if (ip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
883 | goto out_gunlock; |
884 | ||
c752666c SW |
885 | alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); |
886 | if (error < 0) | |
b3b94faa | 887 | goto out_gunlock; |
c752666c | 888 | error = 0; |
b3b94faa DT |
889 | |
890 | if (alloc_required) { | |
d82661d9 | 891 | error = gfs2_quota_lock_check(dip); |
b3b94faa | 892 | if (error) |
5407e242 | 893 | goto out_gunlock; |
b3b94faa | 894 | |
564e12b1 | 895 | error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres); |
b3b94faa DT |
896 | if (error) |
897 | goto out_gunlock_q; | |
898 | ||
1b50259b | 899 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
54335b1f | 900 | gfs2_rg_blocks(dip) + |
b3b94faa DT |
901 | 2 * RES_DINODE + RES_STATFS + |
902 | RES_QUOTA, 0); | |
903 | if (error) | |
904 | goto out_ipres; | |
905 | } else { | |
906 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); | |
907 | if (error) | |
908 | goto out_ipres; | |
909 | } | |
910 | ||
2baee03f | 911 | error = gfs2_meta_inode_buffer(ip, &dibh); |
b3b94faa DT |
912 | if (error) |
913 | goto out_end_trans; | |
914 | ||
3d6ecb7d | 915 | error = gfs2_dir_add(dir, &dentry->d_name, ip); |
2baee03f SW |
916 | if (error) |
917 | goto out_brelse; | |
918 | ||
919 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); | |
920 | inc_nlink(&ip->i_inode); | |
921 | ip->i_inode.i_ctime = CURRENT_TIME; | |
ab9bbda0 SW |
922 | ihold(inode); |
923 | d_instantiate(dentry, inode); | |
924 | mark_inode_dirty(inode); | |
b3b94faa | 925 | |
2baee03f SW |
926 | out_brelse: |
927 | brelse(dibh); | |
feaa7bba | 928 | out_end_trans: |
b3b94faa | 929 | gfs2_trans_end(sdp); |
feaa7bba | 930 | out_ipres: |
b3b94faa DT |
931 | if (alloc_required) |
932 | gfs2_inplace_release(dip); | |
feaa7bba | 933 | out_gunlock_q: |
b3b94faa DT |
934 | if (alloc_required) |
935 | gfs2_quota_unlock(dip); | |
feaa7bba | 936 | out_gunlock: |
72dbf479 BP |
937 | gfs2_glock_dq(ghs + 1); |
938 | out_child: | |
939 | gfs2_glock_dq(ghs); | |
940 | out_parent: | |
b3b94faa DT |
941 | gfs2_holder_uninit(ghs); |
942 | gfs2_holder_uninit(ghs + 1); | |
b3b94faa DT |
943 | return error; |
944 | } | |
945 | ||
87ec2174 SW |
946 | /* |
947 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
948 | * @dip: the directory | |
949 | * @name: the name of the file | |
950 | * @ip: the inode | |
951 | * | |
952 | * Assumes that the lock on (at least) @dip is held. | |
953 | * | |
954 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
955 | */ | |
956 | ||
957 | static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, | |
958 | const struct gfs2_inode *ip) | |
959 | { | |
960 | int error; | |
961 | ||
962 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) | |
963 | return -EPERM; | |
964 | ||
965 | if ((dip->i_inode.i_mode & S_ISVTX) && | |
966 | dip->i_inode.i_uid != current_fsuid() && | |
967 | ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER)) | |
968 | return -EPERM; | |
969 | ||
970 | if (IS_APPEND(&dip->i_inode)) | |
971 | return -EPERM; | |
972 | ||
10556cb2 | 973 | error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); |
87ec2174 SW |
974 | if (error) |
975 | return error; | |
976 | ||
977 | error = gfs2_dir_check(&dip->i_inode, name, ip); | |
978 | if (error) | |
979 | return error; | |
980 | ||
981 | return 0; | |
982 | } | |
983 | ||
b3b94faa | 984 | /** |
855d23ce SW |
985 | * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it |
986 | * @dip: The parent directory | |
987 | * @name: The name of the entry in the parent directory | |
988 | * @bh: The inode buffer for the inode to be removed | |
989 | * @inode: The inode to be removed | |
990 | * | |
991 | * Called with all the locks and in a transaction. This will only be | |
992 | * called for a directory after it has been checked to ensure it is empty. | |
993 | * | |
994 | * Returns: 0 on success, or an error | |
995 | */ | |
996 | ||
997 | static int gfs2_unlink_inode(struct gfs2_inode *dip, | |
998 | const struct dentry *dentry, | |
999 | struct buffer_head *bh) | |
1000 | { | |
1001 | struct inode *inode = dentry->d_inode; | |
1002 | struct gfs2_inode *ip = GFS2_I(inode); | |
1003 | int error; | |
1004 | ||
1005 | error = gfs2_dir_del(dip, dentry); | |
1006 | if (error) | |
1007 | return error; | |
1008 | ||
1009 | ip->i_entries = 0; | |
1010 | inode->i_ctime = CURRENT_TIME; | |
1011 | if (S_ISDIR(inode->i_mode)) | |
1012 | clear_nlink(inode); | |
1013 | else | |
1014 | drop_nlink(inode); | |
855d23ce SW |
1015 | mark_inode_dirty(inode); |
1016 | if (inode->i_nlink == 0) | |
1017 | gfs2_unlink_di(inode); | |
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | ||
1022 | /** | |
1023 | * gfs2_unlink - Unlink an inode (this does rmdir as well) | |
1024 | * @dir: The inode of the directory containing the inode to unlink | |
b3b94faa DT |
1025 | * @dentry: The file itself |
1026 | * | |
855d23ce SW |
1027 | * This routine uses the type of the inode as a flag to figure out |
1028 | * whether this is an unlink or an rmdir. | |
b3b94faa DT |
1029 | * |
1030 | * Returns: errno | |
1031 | */ | |
1032 | ||
1033 | static int gfs2_unlink(struct inode *dir, struct dentry *dentry) | |
1034 | { | |
feaa7bba SW |
1035 | struct gfs2_inode *dip = GFS2_I(dir); |
1036 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
855d23ce SW |
1037 | struct inode *inode = dentry->d_inode; |
1038 | struct gfs2_inode *ip = GFS2_I(inode); | |
1039 | struct buffer_head *bh; | |
ddee7608 RC |
1040 | struct gfs2_holder ghs[3]; |
1041 | struct gfs2_rgrpd *rgd; | |
5e2f7d61 BP |
1042 | int error; |
1043 | ||
1044 | error = gfs2_rindex_update(sdp); | |
1045 | if (error) | |
1046 | return error; | |
1047 | ||
1048 | error = -EROFS; | |
b3b94faa | 1049 | |
b3b94faa | 1050 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
ddee7608 | 1051 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); |
b3b94faa | 1052 | |
66fc061b | 1053 | rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); |
a365fbf3 | 1054 | if (!rgd) |
87654896 | 1055 | goto out_inodes; |
a365fbf3 | 1056 | |
ddee7608 RC |
1057 | gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); |
1058 | ||
1059 | ||
8497a46e | 1060 | error = gfs2_glock_nq(ghs); /* parent */ |
b3b94faa | 1061 | if (error) |
8497a46e SW |
1062 | goto out_parent; |
1063 | ||
1064 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
1065 | if (error) | |
1066 | goto out_child; | |
1067 | ||
d192a8e5 | 1068 | error = -ENOENT; |
855d23ce | 1069 | if (inode->i_nlink == 0) |
d192a8e5 SW |
1070 | goto out_rgrp; |
1071 | ||
855d23ce SW |
1072 | if (S_ISDIR(inode->i_mode)) { |
1073 | error = -ENOTEMPTY; | |
1074 | if (ip->i_entries > 2 || inode->i_nlink > 2) | |
1075 | goto out_rgrp; | |
1076 | } | |
1077 | ||
8497a46e SW |
1078 | error = gfs2_glock_nq(ghs + 2); /* rgrp */ |
1079 | if (error) | |
1080 | goto out_rgrp; | |
b3b94faa DT |
1081 | |
1082 | error = gfs2_unlink_ok(dip, &dentry->d_name, ip); | |
1083 | if (error) | |
72dbf479 | 1084 | goto out_gunlock; |
b3b94faa | 1085 | |
855d23ce | 1086 | error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); |
b3b94faa | 1087 | if (error) |
cd012075 | 1088 | goto out_gunlock; |
b3b94faa | 1089 | |
855d23ce SW |
1090 | error = gfs2_meta_inode_buffer(ip, &bh); |
1091 | if (error) | |
1092 | goto out_end_trans; | |
b3b94faa | 1093 | |
855d23ce SW |
1094 | error = gfs2_unlink_inode(dip, dentry, bh); |
1095 | brelse(bh); | |
b3b94faa | 1096 | |
feaa7bba SW |
1097 | out_end_trans: |
1098 | gfs2_trans_end(sdp); | |
72dbf479 | 1099 | out_gunlock: |
8497a46e SW |
1100 | gfs2_glock_dq(ghs + 2); |
1101 | out_rgrp: | |
8497a46e SW |
1102 | gfs2_glock_dq(ghs + 1); |
1103 | out_child: | |
8497a46e SW |
1104 | gfs2_glock_dq(ghs); |
1105 | out_parent: | |
87654896 SW |
1106 | gfs2_holder_uninit(ghs + 2); |
1107 | out_inodes: | |
1108 | gfs2_holder_uninit(ghs + 1); | |
8497a46e | 1109 | gfs2_holder_uninit(ghs); |
b3b94faa DT |
1110 | return error; |
1111 | } | |
1112 | ||
1113 | /** | |
1114 | * gfs2_symlink - Create a symlink | |
1115 | * @dir: The directory to create the symlink in | |
1116 | * @dentry: The dentry to put the symlink in | |
1117 | * @symname: The thing which the link points to | |
1118 | * | |
1119 | * Returns: errno | |
1120 | */ | |
1121 | ||
1122 | static int gfs2_symlink(struct inode *dir, struct dentry *dentry, | |
1123 | const char *symname) | |
1124 | { | |
feaa7bba | 1125 | struct gfs2_sbd *sdp = GFS2_SB(dir); |
160b4026 | 1126 | unsigned int size; |
b3b94faa | 1127 | |
b3b94faa DT |
1128 | size = strlen(symname); |
1129 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) | |
1130 | return -ENAMETOOLONG; | |
1131 | ||
9a63edd1 | 1132 | return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size, 0); |
b3b94faa DT |
1133 | } |
1134 | ||
1135 | /** | |
1136 | * gfs2_mkdir - Make a directory | |
1137 | * @dir: The parent directory of the new one | |
1138 | * @dentry: The dentry of the new directory | |
1139 | * @mode: The mode of the new directory | |
1140 | * | |
1141 | * Returns: errno | |
1142 | */ | |
1143 | ||
18bb1db3 | 1144 | static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
b3b94faa | 1145 | { |
9a63edd1 | 1146 | return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 0, 0); |
b3b94faa DT |
1147 | } |
1148 | ||
b3b94faa DT |
1149 | /** |
1150 | * gfs2_mknod - Make a special file | |
1151 | * @dir: The directory in which the special file will reside | |
1152 | * @dentry: The dentry of the special file | |
1153 | * @mode: The mode of the special file | |
f2741d98 | 1154 | * @dev: The device specification of the special file |
b3b94faa DT |
1155 | * |
1156 | */ | |
1157 | ||
1a67aafb | 1158 | static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, |
b3b94faa DT |
1159 | dev_t dev) |
1160 | { | |
9a63edd1 | 1161 | return gfs2_create_inode(dir, dentry, mode, dev, NULL, 0, 0); |
b3b94faa DT |
1162 | } |
1163 | ||
0188d6c5 SW |
1164 | /* |
1165 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1166 | * @this: move this | |
1167 | * @to: to here | |
1168 | * | |
1169 | * Follow @to back to the root and make sure we don't encounter @this | |
1170 | * Assumes we already hold the rename lock. | |
1171 | * | |
1172 | * Returns: errno | |
1173 | */ | |
1174 | ||
1175 | static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1176 | { | |
1177 | struct inode *dir = &to->i_inode; | |
1178 | struct super_block *sb = dir->i_sb; | |
1179 | struct inode *tmp; | |
0188d6c5 SW |
1180 | int error = 0; |
1181 | ||
0188d6c5 SW |
1182 | igrab(dir); |
1183 | ||
1184 | for (;;) { | |
1185 | if (dir == &this->i_inode) { | |
1186 | error = -EINVAL; | |
1187 | break; | |
1188 | } | |
1189 | if (dir == sb->s_root->d_inode) { | |
1190 | error = 0; | |
1191 | break; | |
1192 | } | |
1193 | ||
8d123585 | 1194 | tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); |
0188d6c5 SW |
1195 | if (IS_ERR(tmp)) { |
1196 | error = PTR_ERR(tmp); | |
1197 | break; | |
1198 | } | |
1199 | ||
1200 | iput(dir); | |
1201 | dir = tmp; | |
1202 | } | |
1203 | ||
1204 | iput(dir); | |
1205 | ||
1206 | return error; | |
1207 | } | |
1208 | ||
b3b94faa DT |
1209 | /** |
1210 | * gfs2_rename - Rename a file | |
1211 | * @odir: Parent directory of old file name | |
1212 | * @odentry: The old dentry of the file | |
1213 | * @ndir: Parent directory of new file name | |
1214 | * @ndentry: The new dentry of the file | |
1215 | * | |
1216 | * Returns: errno | |
1217 | */ | |
1218 | ||
1219 | static int gfs2_rename(struct inode *odir, struct dentry *odentry, | |
1220 | struct inode *ndir, struct dentry *ndentry) | |
1221 | { | |
feaa7bba SW |
1222 | struct gfs2_inode *odip = GFS2_I(odir); |
1223 | struct gfs2_inode *ndip = GFS2_I(ndir); | |
1224 | struct gfs2_inode *ip = GFS2_I(odentry->d_inode); | |
b3b94faa | 1225 | struct gfs2_inode *nip = NULL; |
feaa7bba | 1226 | struct gfs2_sbd *sdp = GFS2_SB(odir); |
8339ee54 | 1227 | struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; |
ddee7608 | 1228 | struct gfs2_rgrpd *nrgd; |
b3b94faa DT |
1229 | unsigned int num_gh; |
1230 | int dir_rename = 0; | |
24b977b5 | 1231 | int alloc_required = 0; |
b3b94faa DT |
1232 | unsigned int x; |
1233 | int error; | |
1234 | ||
b3b94faa | 1235 | if (ndentry->d_inode) { |
feaa7bba | 1236 | nip = GFS2_I(ndentry->d_inode); |
b3b94faa DT |
1237 | if (ip == nip) |
1238 | return 0; | |
1239 | } | |
1240 | ||
5e2f7d61 BP |
1241 | error = gfs2_rindex_update(sdp); |
1242 | if (error) | |
1243 | return error; | |
1244 | ||
0a305e49 BP |
1245 | error = gfs2_rs_alloc(ndip); |
1246 | if (error) | |
1247 | return error; | |
1248 | ||
0188d6c5 SW |
1249 | if (odip != ndip) { |
1250 | error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, | |
1251 | 0, &r_gh); | |
b3b94faa DT |
1252 | if (error) |
1253 | goto out; | |
1254 | ||
0188d6c5 SW |
1255 | if (S_ISDIR(ip->i_inode.i_mode)) { |
1256 | dir_rename = 1; | |
1257 | /* don't move a dirctory into it's subdir */ | |
1258 | error = gfs2_ok_to_move(ip, ndip); | |
1259 | if (error) | |
1260 | goto out_gunlock_r; | |
1261 | } | |
b3b94faa DT |
1262 | } |
1263 | ||
d9d1ca30 | 1264 | num_gh = 1; |
b3b94faa | 1265 | gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
d9d1ca30 SW |
1266 | if (odip != ndip) { |
1267 | gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1268 | num_gh++; | |
1269 | } | |
1270 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1271 | num_gh++; | |
b3b94faa | 1272 | |
d9d1ca30 SW |
1273 | if (nip) { |
1274 | gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1275 | num_gh++; | |
ddee7608 RC |
1276 | /* grab the resource lock for unlink flag twiddling |
1277 | * this is the case of the target file already existing | |
1278 | * so we unlink before doing the rename | |
1279 | */ | |
66fc061b | 1280 | nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); |
ddee7608 RC |
1281 | if (nrgd) |
1282 | gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); | |
d9d1ca30 | 1283 | } |
b3b94faa | 1284 | |
72dbf479 BP |
1285 | for (x = 0; x < num_gh; x++) { |
1286 | error = gfs2_glock_nq(ghs + x); | |
1287 | if (error) | |
1288 | goto out_gunlock; | |
1289 | } | |
b3b94faa | 1290 | |
d192a8e5 SW |
1291 | error = -ENOENT; |
1292 | if (ip->i_inode.i_nlink == 0) | |
1293 | goto out_gunlock; | |
1294 | ||
b3b94faa DT |
1295 | /* Check out the old directory */ |
1296 | ||
1297 | error = gfs2_unlink_ok(odip, &odentry->d_name, ip); | |
1298 | if (error) | |
1299 | goto out_gunlock; | |
1300 | ||
1301 | /* Check out the new directory */ | |
1302 | ||
1303 | if (nip) { | |
1304 | error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); | |
1305 | if (error) | |
1306 | goto out_gunlock; | |
1307 | ||
d192a8e5 SW |
1308 | if (nip->i_inode.i_nlink == 0) { |
1309 | error = -EAGAIN; | |
1310 | goto out_gunlock; | |
1311 | } | |
1312 | ||
b60623c2 | 1313 | if (S_ISDIR(nip->i_inode.i_mode)) { |
ad6203f2 | 1314 | if (nip->i_entries < 2) { |
94fb763b | 1315 | gfs2_consist_inode(nip); |
b3b94faa DT |
1316 | error = -EIO; |
1317 | goto out_gunlock; | |
1318 | } | |
ad6203f2 | 1319 | if (nip->i_entries > 2) { |
b3b94faa DT |
1320 | error = -ENOTEMPTY; |
1321 | goto out_gunlock; | |
1322 | } | |
1323 | } | |
1324 | } else { | |
10556cb2 | 1325 | error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); |
b3b94faa DT |
1326 | if (error) |
1327 | goto out_gunlock; | |
1328 | ||
dbb7cae2 | 1329 | error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); |
b3b94faa DT |
1330 | switch (error) { |
1331 | case -ENOENT: | |
1332 | error = 0; | |
1333 | break; | |
1334 | case 0: | |
1335 | error = -EEXIST; | |
1336 | default: | |
1337 | goto out_gunlock; | |
1338 | }; | |
1339 | ||
1340 | if (odip != ndip) { | |
4f56110a | 1341 | if (!ndip->i_inode.i_nlink) { |
d192a8e5 | 1342 | error = -ENOENT; |
b3b94faa DT |
1343 | goto out_gunlock; |
1344 | } | |
ad6203f2 | 1345 | if (ndip->i_entries == (u32)-1) { |
b3b94faa DT |
1346 | error = -EFBIG; |
1347 | goto out_gunlock; | |
1348 | } | |
b60623c2 | 1349 | if (S_ISDIR(ip->i_inode.i_mode) && |
4f56110a | 1350 | ndip->i_inode.i_nlink == (u32)-1) { |
b3b94faa DT |
1351 | error = -EMLINK; |
1352 | goto out_gunlock; | |
1353 | } | |
1354 | } | |
1355 | } | |
1356 | ||
1357 | /* Check out the dir to be renamed */ | |
1358 | ||
1359 | if (dir_rename) { | |
10556cb2 | 1360 | error = gfs2_permission(odentry->d_inode, MAY_WRITE); |
b3b94faa DT |
1361 | if (error) |
1362 | goto out_gunlock; | |
1363 | } | |
1364 | ||
24b977b5 SW |
1365 | if (nip == NULL) |
1366 | alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); | |
1367 | error = alloc_required; | |
c752666c | 1368 | if (error < 0) |
b3b94faa DT |
1369 | goto out_gunlock; |
1370 | ||
1371 | if (alloc_required) { | |
d82661d9 | 1372 | error = gfs2_quota_lock_check(ndip); |
b3b94faa | 1373 | if (error) |
5407e242 | 1374 | goto out_gunlock; |
b3b94faa | 1375 | |
564e12b1 | 1376 | error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres); |
b3b94faa DT |
1377 | if (error) |
1378 | goto out_gunlock_q; | |
1379 | ||
fe1bdedc | 1380 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
54335b1f | 1381 | gfs2_rg_blocks(ndip) + |
b3b94faa | 1382 | 4 * RES_DINODE + 4 * RES_LEAF + |
87d21e07 | 1383 | RES_STATFS + RES_QUOTA + 4, 0); |
b3b94faa DT |
1384 | if (error) |
1385 | goto out_ipreserv; | |
1386 | } else { | |
1387 | error = gfs2_trans_begin(sdp, 4 * RES_DINODE + | |
87d21e07 | 1388 | 5 * RES_LEAF + 4, 0); |
b3b94faa DT |
1389 | if (error) |
1390 | goto out_gunlock; | |
1391 | } | |
1392 | ||
1393 | /* Remove the target file, if it exists */ | |
1394 | ||
1395 | if (nip) { | |
855d23ce SW |
1396 | struct buffer_head *bh; |
1397 | error = gfs2_meta_inode_buffer(nip, &bh); | |
b3b94faa DT |
1398 | if (error) |
1399 | goto out_end_trans; | |
855d23ce SW |
1400 | error = gfs2_unlink_inode(ndip, ndentry, bh); |
1401 | brelse(bh); | |
b3b94faa DT |
1402 | } |
1403 | ||
1404 | if (dir_rename) { | |
8d123585 | 1405 | error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); |
b3b94faa DT |
1406 | if (error) |
1407 | goto out_end_trans; | |
1408 | } else { | |
1409 | struct buffer_head *dibh; | |
1410 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1411 | if (error) | |
1412 | goto out_end_trans; | |
4bd91ba1 | 1413 | ip->i_inode.i_ctime = CURRENT_TIME; |
d4e9c4c3 | 1414 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b | 1415 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1416 | brelse(dibh); |
1417 | } | |
1418 | ||
855d23ce | 1419 | error = gfs2_dir_del(odip, odentry); |
b3b94faa DT |
1420 | if (error) |
1421 | goto out_end_trans; | |
1422 | ||
3d6ecb7d | 1423 | error = gfs2_dir_add(ndir, &ndentry->d_name, ip); |
b3b94faa DT |
1424 | if (error) |
1425 | goto out_end_trans; | |
1426 | ||
feaa7bba | 1427 | out_end_trans: |
b3b94faa | 1428 | gfs2_trans_end(sdp); |
feaa7bba | 1429 | out_ipreserv: |
b3b94faa DT |
1430 | if (alloc_required) |
1431 | gfs2_inplace_release(ndip); | |
feaa7bba | 1432 | out_gunlock_q: |
b3b94faa DT |
1433 | if (alloc_required) |
1434 | gfs2_quota_unlock(ndip); | |
feaa7bba | 1435 | out_gunlock: |
72dbf479 BP |
1436 | while (x--) { |
1437 | gfs2_glock_dq(ghs + x); | |
b3b94faa | 1438 | gfs2_holder_uninit(ghs + x); |
72dbf479 | 1439 | } |
feaa7bba | 1440 | out_gunlock_r: |
0188d6c5 | 1441 | if (r_gh.gh_gl) |
b3b94faa | 1442 | gfs2_glock_dq_uninit(&r_gh); |
feaa7bba | 1443 | out: |
b3b94faa DT |
1444 | return error; |
1445 | } | |
1446 | ||
536baf02 | 1447 | /** |
c177c2ac AV |
1448 | * gfs2_follow_link - Follow a symbolic link |
1449 | * @dentry: The dentry of the link | |
1450 | * @nd: Data that we pass to vfs_follow_link() | |
536baf02 | 1451 | * |
c177c2ac | 1452 | * This can handle symlinks of any size. |
536baf02 | 1453 | * |
c177c2ac | 1454 | * Returns: 0 on success or error code |
536baf02 SW |
1455 | */ |
1456 | ||
c177c2ac | 1457 | static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) |
536baf02 | 1458 | { |
c177c2ac | 1459 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); |
536baf02 SW |
1460 | struct gfs2_holder i_gh; |
1461 | struct buffer_head *dibh; | |
160b4026 | 1462 | unsigned int size; |
c177c2ac | 1463 | char *buf; |
536baf02 SW |
1464 | int error; |
1465 | ||
1466 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); | |
1467 | error = gfs2_glock_nq(&i_gh); | |
1468 | if (error) { | |
1469 | gfs2_holder_uninit(&i_gh); | |
c177c2ac AV |
1470 | nd_set_link(nd, ERR_PTR(error)); |
1471 | return NULL; | |
536baf02 SW |
1472 | } |
1473 | ||
a2e0f799 SW |
1474 | size = (unsigned int)i_size_read(&ip->i_inode); |
1475 | if (size == 0) { | |
536baf02 | 1476 | gfs2_consist_inode(ip); |
c177c2ac | 1477 | buf = ERR_PTR(-EIO); |
536baf02 SW |
1478 | goto out; |
1479 | } | |
1480 | ||
1481 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
c177c2ac AV |
1482 | if (error) { |
1483 | buf = ERR_PTR(error); | |
536baf02 | 1484 | goto out; |
536baf02 SW |
1485 | } |
1486 | ||
160b4026 | 1487 | buf = kzalloc(size + 1, GFP_NOFS); |
c177c2ac AV |
1488 | if (!buf) |
1489 | buf = ERR_PTR(-ENOMEM); | |
1490 | else | |
160b4026 | 1491 | memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); |
536baf02 SW |
1492 | brelse(dibh); |
1493 | out: | |
1494 | gfs2_glock_dq_uninit(&i_gh); | |
c177c2ac AV |
1495 | nd_set_link(nd, buf); |
1496 | return NULL; | |
b3b94faa DT |
1497 | } |
1498 | ||
c177c2ac | 1499 | static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
b3b94faa | 1500 | { |
c177c2ac AV |
1501 | char *s = nd_get_link(nd); |
1502 | if (!IS_ERR(s)) | |
1503 | kfree(s); | |
b3b94faa DT |
1504 | } |
1505 | ||
1506 | /** | |
1507 | * gfs2_permission - | |
75d5cfbe SW |
1508 | * @inode: The inode |
1509 | * @mask: The mask to be tested | |
1510 | * @flags: Indicates whether this is an RCU path walk or not | |
b3b94faa | 1511 | * |
300c7d75 SW |
1512 | * This may be called from the VFS directly, or from within GFS2 with the |
1513 | * inode locked, so we look to see if the glock is already locked and only | |
1514 | * lock the glock if its not already been done. | |
1515 | * | |
b3b94faa DT |
1516 | * Returns: errno |
1517 | */ | |
1518 | ||
10556cb2 | 1519 | int gfs2_permission(struct inode *inode, int mask) |
b3b94faa | 1520 | { |
b74c79e9 | 1521 | struct gfs2_inode *ip; |
b3b94faa DT |
1522 | struct gfs2_holder i_gh; |
1523 | int error; | |
300c7d75 | 1524 | int unlock = 0; |
b3b94faa | 1525 | |
b74c79e9 NP |
1526 | |
1527 | ip = GFS2_I(inode); | |
7afd88d9 | 1528 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
10556cb2 | 1529 | if (mask & MAY_NOT_BLOCK) |
75d5cfbe | 1530 | return -ECHILD; |
300c7d75 SW |
1531 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
1532 | if (error) | |
1533 | return error; | |
1534 | unlock = 1; | |
1535 | } | |
b3b94faa | 1536 | |
f58ba889 MS |
1537 | if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) |
1538 | error = -EACCES; | |
1539 | else | |
2830ba7f | 1540 | error = generic_permission(inode, mask); |
300c7d75 | 1541 | if (unlock) |
b3b94faa | 1542 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1543 | |
1544 | return error; | |
1545 | } | |
1546 | ||
ab9bbda0 | 1547 | static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) |
194c011f | 1548 | { |
194c011f SW |
1549 | setattr_copy(inode, attr); |
1550 | mark_inode_dirty(inode); | |
194c011f SW |
1551 | return 0; |
1552 | } | |
1553 | ||
1554 | /** | |
1555 | * gfs2_setattr_simple - | |
1556 | * @ip: | |
1557 | * @attr: | |
1558 | * | |
1559 | * Returns: errno | |
1560 | */ | |
1561 | ||
ab9bbda0 | 1562 | int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) |
194c011f SW |
1563 | { |
1564 | int error; | |
1565 | ||
1566 | if (current->journal_info) | |
ab9bbda0 | 1567 | return __gfs2_setattr_simple(inode, attr); |
194c011f | 1568 | |
ab9bbda0 | 1569 | error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); |
194c011f SW |
1570 | if (error) |
1571 | return error; | |
1572 | ||
ab9bbda0 SW |
1573 | error = __gfs2_setattr_simple(inode, attr); |
1574 | gfs2_trans_end(GFS2_SB(inode)); | |
194c011f SW |
1575 | return error; |
1576 | } | |
1577 | ||
b3b94faa DT |
1578 | static int setattr_chown(struct inode *inode, struct iattr *attr) |
1579 | { | |
feaa7bba SW |
1580 | struct gfs2_inode *ip = GFS2_I(inode); |
1581 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
cd915493 | 1582 | u32 ouid, ogid, nuid, ngid; |
b3b94faa DT |
1583 | int error; |
1584 | ||
2933f925 SW |
1585 | ouid = inode->i_uid; |
1586 | ogid = inode->i_gid; | |
b3b94faa DT |
1587 | nuid = attr->ia_uid; |
1588 | ngid = attr->ia_gid; | |
1589 | ||
1590 | if (!(attr->ia_valid & ATTR_UID) || ouid == nuid) | |
1591 | ouid = nuid = NO_QUOTA_CHANGE; | |
1592 | if (!(attr->ia_valid & ATTR_GID) || ogid == ngid) | |
1593 | ogid = ngid = NO_QUOTA_CHANGE; | |
1594 | ||
b3b94faa DT |
1595 | error = gfs2_quota_lock(ip, nuid, ngid); |
1596 | if (error) | |
5407e242 | 1597 | return error; |
b3b94faa DT |
1598 | |
1599 | if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { | |
1600 | error = gfs2_quota_check(ip, nuid, ngid); | |
1601 | if (error) | |
1602 | goto out_gunlock_q; | |
1603 | } | |
1604 | ||
1605 | error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); | |
1606 | if (error) | |
1607 | goto out_gunlock_q; | |
1608 | ||
ab9bbda0 | 1609 | error = gfs2_setattr_simple(inode, attr); |
b3b94faa DT |
1610 | if (error) |
1611 | goto out_end_trans; | |
1612 | ||
b3b94faa | 1613 | if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { |
77658aad SW |
1614 | u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); |
1615 | gfs2_quota_change(ip, -blocks, ouid, ogid); | |
1616 | gfs2_quota_change(ip, blocks, nuid, ngid); | |
b3b94faa DT |
1617 | } |
1618 | ||
a91ea69f | 1619 | out_end_trans: |
b3b94faa | 1620 | gfs2_trans_end(sdp); |
a91ea69f | 1621 | out_gunlock_q: |
b3b94faa | 1622 | gfs2_quota_unlock(ip); |
b3b94faa DT |
1623 | return error; |
1624 | } | |
1625 | ||
1626 | /** | |
1627 | * gfs2_setattr - Change attributes on an inode | |
1628 | * @dentry: The dentry which is changing | |
1629 | * @attr: The structure describing the change | |
1630 | * | |
1631 | * The VFS layer wants to change one or more of an inodes attributes. Write | |
1632 | * that change out to disk. | |
1633 | * | |
1634 | * Returns: errno | |
1635 | */ | |
1636 | ||
1637 | static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) | |
1638 | { | |
1639 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1640 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1641 | struct gfs2_holder i_gh; |
1642 | int error; | |
1643 | ||
0a305e49 BP |
1644 | error = gfs2_rs_alloc(ip); |
1645 | if (error) | |
1646 | return error; | |
1647 | ||
b3b94faa DT |
1648 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); |
1649 | if (error) | |
1650 | return error; | |
1651 | ||
1652 | error = -EPERM; | |
1653 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
1654 | goto out; | |
1655 | ||
1656 | error = inode_change_ok(inode, attr); | |
1657 | if (error) | |
1658 | goto out; | |
1659 | ||
1660 | if (attr->ia_valid & ATTR_SIZE) | |
ff8f33c8 | 1661 | error = gfs2_setattr_size(inode, attr->ia_size); |
b3b94faa DT |
1662 | else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) |
1663 | error = setattr_chown(inode, attr); | |
1664 | else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) | |
1665 | error = gfs2_acl_chmod(ip, attr); | |
1666 | else | |
ab9bbda0 | 1667 | error = gfs2_setattr_simple(inode, attr); |
b3b94faa | 1668 | |
a91ea69f | 1669 | out: |
b3b94faa DT |
1670 | if (!error) |
1671 | mark_inode_dirty(inode); | |
ab9bbda0 | 1672 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1673 | return error; |
1674 | } | |
1675 | ||
1676 | /** | |
1677 | * gfs2_getattr - Read out an inode's attributes | |
26c1a574 | 1678 | * @mnt: The vfsmount the inode is being accessed from |
b3b94faa DT |
1679 | * @dentry: The dentry to stat |
1680 | * @stat: The inode's stats | |
1681 | * | |
dcf3dd85 SW |
1682 | * This may be called from the VFS directly, or from within GFS2 with the |
1683 | * inode locked, so we look to see if the glock is already locked and only | |
1684 | * lock the glock if its not already been done. Note that its the NFS | |
1685 | * readdirplus operation which causes this to be called (from filldir) | |
1686 | * with the glock already held. | |
1687 | * | |
b3b94faa DT |
1688 | * Returns: errno |
1689 | */ | |
1690 | ||
1691 | static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
1692 | struct kstat *stat) | |
1693 | { | |
1694 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1695 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1696 | struct gfs2_holder gh; |
1697 | int error; | |
dcf3dd85 | 1698 | int unlock = 0; |
b3b94faa | 1699 | |
7afd88d9 | 1700 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
dcf3dd85 SW |
1701 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1702 | if (error) | |
1703 | return error; | |
1704 | unlock = 1; | |
b3b94faa DT |
1705 | } |
1706 | ||
dcf3dd85 | 1707 | generic_fillattr(inode, stat); |
d7c103d0 | 1708 | if (unlock) |
dcf3dd85 SW |
1709 | gfs2_glock_dq_uninit(&gh); |
1710 | ||
1711 | return 0; | |
b3b94faa DT |
1712 | } |
1713 | ||
1714 | static int gfs2_setxattr(struct dentry *dentry, const char *name, | |
1715 | const void *data, size_t size, int flags) | |
1716 | { | |
feaa7bba | 1717 | struct inode *inode = dentry->d_inode; |
40b78a32 SW |
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_EXCLUSIVE, 0, &gh); |
1723 | ret = gfs2_glock_nq(&gh); | |
1724 | if (ret == 0) { | |
645b2ccc SW |
1725 | ret = gfs2_rs_alloc(ip); |
1726 | if (ret == 0) | |
1727 | ret = generic_setxattr(dentry, name, data, size, flags); | |
40b78a32 SW |
1728 | gfs2_glock_dq(&gh); |
1729 | } | |
1730 | gfs2_holder_uninit(&gh); | |
1731 | return ret; | |
b3b94faa DT |
1732 | } |
1733 | ||
1734 | static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, | |
1735 | void *data, size_t size) | |
1736 | { | |
40b78a32 SW |
1737 | struct inode *inode = dentry->d_inode; |
1738 | struct gfs2_inode *ip = GFS2_I(inode); | |
1739 | struct gfs2_holder gh; | |
1740 | int ret; | |
b3b94faa | 1741 | |
40b78a32 SW |
1742 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1743 | ret = gfs2_glock_nq(&gh); | |
1744 | if (ret == 0) { | |
1745 | ret = generic_getxattr(dentry, name, data, size); | |
1746 | gfs2_glock_dq(&gh); | |
1747 | } | |
1748 | gfs2_holder_uninit(&gh); | |
1749 | return ret; | |
b3b94faa DT |
1750 | } |
1751 | ||
1752 | static int gfs2_removexattr(struct dentry *dentry, const char *name) | |
1753 | { | |
40b78a32 SW |
1754 | struct inode *inode = dentry->d_inode; |
1755 | struct gfs2_inode *ip = GFS2_I(inode); | |
1756 | struct gfs2_holder gh; | |
1757 | int ret; | |
b3b94faa | 1758 | |
40b78a32 SW |
1759 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
1760 | ret = gfs2_glock_nq(&gh); | |
1761 | if (ret == 0) { | |
645b2ccc SW |
1762 | ret = gfs2_rs_alloc(ip); |
1763 | if (ret == 0) | |
1764 | ret = generic_removexattr(dentry, name); | |
40b78a32 SW |
1765 | gfs2_glock_dq(&gh); |
1766 | } | |
1767 | gfs2_holder_uninit(&gh); | |
1768 | return ret; | |
b3b94faa DT |
1769 | } |
1770 | ||
e9079cce SW |
1771 | static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
1772 | u64 start, u64 len) | |
1773 | { | |
1774 | struct gfs2_inode *ip = GFS2_I(inode); | |
1775 | struct gfs2_holder gh; | |
1776 | int ret; | |
1777 | ||
1778 | ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); | |
1779 | if (ret) | |
1780 | return ret; | |
1781 | ||
1782 | mutex_lock(&inode->i_mutex); | |
1783 | ||
1784 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); | |
1785 | if (ret) | |
1786 | goto out; | |
1787 | ||
1788 | if (gfs2_is_stuffed(ip)) { | |
1789 | u64 phys = ip->i_no_addr << inode->i_blkbits; | |
1790 | u64 size = i_size_read(inode); | |
1791 | u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| | |
1792 | FIEMAP_EXTENT_DATA_INLINE; | |
1793 | phys += sizeof(struct gfs2_dinode); | |
1794 | phys += start; | |
1795 | if (start + len > size) | |
1796 | len = size - start; | |
1797 | if (start < size) | |
1798 | ret = fiemap_fill_next_extent(fieinfo, start, phys, | |
1799 | len, flags); | |
1800 | if (ret == 1) | |
1801 | ret = 0; | |
1802 | } else { | |
1803 | ret = __generic_block_fiemap(inode, fieinfo, start, len, | |
1804 | gfs2_block_map); | |
1805 | } | |
1806 | ||
1807 | gfs2_glock_dq_uninit(&gh); | |
1808 | out: | |
1809 | mutex_unlock(&inode->i_mutex); | |
1810 | return ret; | |
1811 | } | |
1812 | ||
92e1d5be | 1813 | const struct inode_operations gfs2_file_iops = { |
e6305c43 | 1814 | .permission = gfs2_permission, |
b3b94faa DT |
1815 | .setattr = gfs2_setattr, |
1816 | .getattr = gfs2_getattr, | |
1817 | .setxattr = gfs2_setxattr, | |
1818 | .getxattr = gfs2_getxattr, | |
1819 | .listxattr = gfs2_listxattr, | |
1820 | .removexattr = gfs2_removexattr, | |
e9079cce | 1821 | .fiemap = gfs2_fiemap, |
4e34e719 | 1822 | .get_acl = gfs2_get_acl, |
b3b94faa DT |
1823 | }; |
1824 | ||
92e1d5be | 1825 | const struct inode_operations gfs2_dir_iops = { |
b3b94faa DT |
1826 | .create = gfs2_create, |
1827 | .lookup = gfs2_lookup, | |
1828 | .link = gfs2_link, | |
1829 | .unlink = gfs2_unlink, | |
1830 | .symlink = gfs2_symlink, | |
1831 | .mkdir = gfs2_mkdir, | |
855d23ce | 1832 | .rmdir = gfs2_unlink, |
b3b94faa DT |
1833 | .mknod = gfs2_mknod, |
1834 | .rename = gfs2_rename, | |
e6305c43 | 1835 | .permission = gfs2_permission, |
b3b94faa DT |
1836 | .setattr = gfs2_setattr, |
1837 | .getattr = gfs2_getattr, | |
1838 | .setxattr = gfs2_setxattr, | |
1839 | .getxattr = gfs2_getxattr, | |
1840 | .listxattr = gfs2_listxattr, | |
1841 | .removexattr = gfs2_removexattr, | |
e9079cce | 1842 | .fiemap = gfs2_fiemap, |
4e34e719 | 1843 | .get_acl = gfs2_get_acl, |
b3b94faa DT |
1844 | }; |
1845 | ||
92e1d5be | 1846 | const struct inode_operations gfs2_symlink_iops = { |
c177c2ac | 1847 | .readlink = generic_readlink, |
b3b94faa | 1848 | .follow_link = gfs2_follow_link, |
c177c2ac | 1849 | .put_link = gfs2_put_link, |
e6305c43 | 1850 | .permission = gfs2_permission, |
b3b94faa DT |
1851 | .setattr = gfs2_setattr, |
1852 | .getattr = gfs2_getattr, | |
1853 | .setxattr = gfs2_setxattr, | |
1854 | .getxattr = gfs2_getxattr, | |
1855 | .listxattr = gfs2_listxattr, | |
1856 | .removexattr = gfs2_removexattr, | |
e9079cce | 1857 | .fiemap = gfs2_fiemap, |
4e34e719 | 1858 | .get_acl = gfs2_get_acl, |
b3b94faa DT |
1859 | }; |
1860 |