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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: | |
a6a4d98b | 192 | ip->i_iopen_gh.gh_flags |= GL_NOCACHE; |
194c011f SW |
193 | ip->i_iopen_gh.gh_gl->gl_object = NULL; |
194 | gfs2_glock_dq_uninit(&ip->i_iopen_gh); | |
195 | fail_iopen: | |
196 | if (io_gl) | |
197 | gfs2_glock_put(io_gl); | |
198 | fail_put: | |
199 | ip->i_gl->gl_object = NULL; | |
200 | gfs2_glock_put(ip->i_gl); | |
201 | fail: | |
202 | iget_failed(inode); | |
203 | return ERR_PTR(error); | |
204 | } | |
205 | ||
206 | struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, | |
207 | u64 *no_formal_ino, unsigned int blktype) | |
208 | { | |
209 | struct super_block *sb = sdp->sd_vfs; | |
210 | struct gfs2_holder i_gh; | |
211 | struct inode *inode = NULL; | |
212 | int error; | |
213 | ||
214 | /* Must not read in block until block type is verified */ | |
215 | error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops, | |
216 | LM_ST_EXCLUSIVE, GL_SKIP, &i_gh); | |
217 | if (error) | |
218 | return ERR_PTR(error); | |
219 | ||
220 | error = gfs2_check_blk_type(sdp, no_addr, blktype); | |
221 | if (error) | |
222 | goto fail; | |
223 | ||
224 | inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1); | |
225 | if (IS_ERR(inode)) | |
226 | goto fail; | |
227 | ||
228 | /* Two extra checks for NFS only */ | |
229 | if (no_formal_ino) { | |
230 | error = -ESTALE; | |
231 | if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino) | |
232 | goto fail_iput; | |
233 | ||
234 | error = -EIO; | |
235 | if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) | |
236 | goto fail_iput; | |
237 | ||
238 | error = 0; | |
239 | } | |
240 | ||
241 | fail: | |
242 | gfs2_glock_dq_uninit(&i_gh); | |
243 | return error ? ERR_PTR(error) : inode; | |
244 | fail_iput: | |
245 | iput(inode); | |
246 | goto fail; | |
247 | } | |
248 | ||
249 | ||
250 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) | |
251 | { | |
252 | struct qstr qstr; | |
253 | struct inode *inode; | |
254 | gfs2_str2qstr(&qstr, name); | |
255 | inode = gfs2_lookupi(dip, &qstr, 1); | |
256 | /* gfs2_lookupi has inconsistent callers: vfs | |
257 | * related routines expect NULL for no entry found, | |
258 | * gfs2_lookup_simple callers expect ENOENT | |
259 | * and do not check for NULL. | |
260 | */ | |
261 | if (inode == NULL) | |
262 | return ERR_PTR(-ENOENT); | |
263 | else | |
264 | return inode; | |
265 | } | |
266 | ||
267 | ||
268 | /** | |
269 | * gfs2_lookupi - Look up a filename in a directory and return its inode | |
270 | * @d_gh: An initialized holder for the directory glock | |
271 | * @name: The name of the inode to look for | |
272 | * @is_root: If 1, ignore the caller's permissions | |
273 | * @i_gh: An uninitialized holder for the new inode glock | |
274 | * | |
275 | * This can be called via the VFS filldir function when NFS is doing | |
276 | * a readdirplus and the inode which its intending to stat isn't | |
277 | * already in cache. In this case we must not take the directory glock | |
278 | * again, since the readdir call will have already taken that lock. | |
279 | * | |
280 | * Returns: errno | |
281 | */ | |
282 | ||
283 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, | |
284 | int is_root) | |
285 | { | |
286 | struct super_block *sb = dir->i_sb; | |
287 | struct gfs2_inode *dip = GFS2_I(dir); | |
288 | struct gfs2_holder d_gh; | |
289 | int error = 0; | |
290 | struct inode *inode = NULL; | |
291 | int unlock = 0; | |
292 | ||
293 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
294 | return ERR_PTR(-ENAMETOOLONG); | |
295 | ||
296 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || | |
297 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && | |
298 | dir == sb->s_root->d_inode)) { | |
299 | igrab(dir); | |
300 | return dir; | |
301 | } | |
302 | ||
303 | if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { | |
304 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); | |
305 | if (error) | |
306 | return ERR_PTR(error); | |
307 | unlock = 1; | |
308 | } | |
309 | ||
310 | if (!is_root) { | |
10556cb2 | 311 | error = gfs2_permission(dir, MAY_EXEC); |
194c011f SW |
312 | if (error) |
313 | goto out; | |
314 | } | |
315 | ||
5a00f3cc | 316 | inode = gfs2_dir_search(dir, name, false); |
194c011f SW |
317 | if (IS_ERR(inode)) |
318 | error = PTR_ERR(inode); | |
319 | out: | |
320 | if (unlock) | |
321 | gfs2_glock_dq_uninit(&d_gh); | |
322 | if (error == -ENOENT) | |
323 | return NULL; | |
324 | return inode ? inode : ERR_PTR(error); | |
325 | } | |
326 | ||
327 | /** | |
328 | * create_ok - OK to create a new on-disk inode here? | |
329 | * @dip: Directory in which dinode is to be created | |
330 | * @name: Name of new dinode | |
331 | * @mode: | |
332 | * | |
333 | * Returns: errno | |
334 | */ | |
335 | ||
336 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, | |
175a4eb7 | 337 | umode_t mode) |
194c011f SW |
338 | { |
339 | int error; | |
340 | ||
10556cb2 | 341 | error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); |
194c011f SW |
342 | if (error) |
343 | return error; | |
344 | ||
345 | /* Don't create entries in an unlinked directory */ | |
346 | if (!dip->i_inode.i_nlink) | |
347 | return -ENOENT; | |
348 | ||
194c011f SW |
349 | if (dip->i_entries == (u32)-1) |
350 | return -EFBIG; | |
351 | if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) | |
352 | return -EMLINK; | |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
c9aecf73 SW |
357 | static void munge_mode_uid_gid(const struct gfs2_inode *dip, |
358 | struct inode *inode) | |
194c011f SW |
359 | { |
360 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && | |
6b24c0d2 EB |
361 | (dip->i_inode.i_mode & S_ISUID) && |
362 | !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) { | |
c9aecf73 SW |
363 | if (S_ISDIR(inode->i_mode)) |
364 | inode->i_mode |= S_ISUID; | |
6b24c0d2 | 365 | else if (!uid_eq(dip->i_inode.i_uid, current_fsuid())) |
c9aecf73 SW |
366 | inode->i_mode &= ~07111; |
367 | inode->i_uid = dip->i_inode.i_uid; | |
194c011f | 368 | } else |
c9aecf73 | 369 | inode->i_uid = current_fsuid(); |
194c011f SW |
370 | |
371 | if (dip->i_inode.i_mode & S_ISGID) { | |
c9aecf73 SW |
372 | if (S_ISDIR(inode->i_mode)) |
373 | inode->i_mode |= S_ISGID; | |
374 | inode->i_gid = dip->i_inode.i_gid; | |
194c011f | 375 | } else |
c9aecf73 | 376 | inode->i_gid = current_fsgid(); |
194c011f SW |
377 | } |
378 | ||
9dbe9610 | 379 | static int alloc_dinode(struct gfs2_inode *ip, u32 flags) |
194c011f | 380 | { |
c9aecf73 | 381 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
194c011f | 382 | int error; |
6a8099ed | 383 | int dblocks = 1; |
194c011f | 384 | |
fd4b4e04 | 385 | error = gfs2_quota_lock_check(ip); |
194c011f SW |
386 | if (error) |
387 | goto out; | |
388 | ||
fd4b4e04 SW |
389 | error = gfs2_inplace_reserve(ip, RES_DINODE, flags); |
390 | if (error) | |
391 | goto out_quota; | |
392 | ||
393 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 0); | |
194c011f SW |
394 | if (error) |
395 | goto out_ipreserv; | |
396 | ||
c9aecf73 SW |
397 | error = gfs2_alloc_blocks(ip, &ip->i_no_addr, &dblocks, 1, &ip->i_generation); |
398 | ip->i_no_formal_ino = ip->i_generation; | |
399 | ip->i_inode.i_ino = ip->i_no_addr; | |
400 | ip->i_goal = ip->i_no_addr; | |
194c011f SW |
401 | |
402 | gfs2_trans_end(sdp); | |
403 | ||
404 | out_ipreserv: | |
c9aecf73 | 405 | gfs2_inplace_release(ip); |
fd4b4e04 SW |
406 | out_quota: |
407 | gfs2_quota_unlock(ip); | |
194c011f | 408 | out: |
194c011f SW |
409 | return error; |
410 | } | |
411 | ||
f2741d98 SW |
412 | static void gfs2_init_dir(struct buffer_head *dibh, |
413 | const struct gfs2_inode *parent) | |
e2d0a13b SW |
414 | { |
415 | struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; | |
416 | struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); | |
417 | ||
418 | gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); | |
419 | dent->de_inum = di->di_num; /* already GFS2 endian */ | |
420 | dent->de_type = cpu_to_be16(DT_DIR); | |
421 | ||
422 | dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); | |
423 | gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); | |
424 | gfs2_inum_out(parent, dent); | |
425 | dent->de_type = cpu_to_be16(DT_DIR); | |
426 | ||
427 | } | |
428 | ||
194c011f SW |
429 | /** |
430 | * init_dinode - Fill in a new dinode structure | |
f2741d98 | 431 | * @dip: The directory this inode is being created in |
c9aecf73 | 432 | * @ip: The inode |
f2741d98 | 433 | * @symname: The symlink destination (if a symlink) |
f2741d98 | 434 | * @bhp: The buffer head (returned to caller) |
194c011f SW |
435 | * |
436 | */ | |
437 | ||
c9aecf73 | 438 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, |
79ba7480 | 439 | const char *symname) |
194c011f | 440 | { |
194c011f SW |
441 | struct gfs2_dinode *di; |
442 | struct buffer_head *dibh; | |
194c011f | 443 | |
c9aecf73 | 444 | dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr); |
350a9b0a | 445 | gfs2_trans_add_meta(ip->i_gl, dibh); |
194c011f | 446 | di = (struct gfs2_dinode *)dibh->b_data; |
79ba7480 | 447 | gfs2_dinode_out(ip, di); |
194c011f | 448 | |
c9aecf73 SW |
449 | di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev)); |
450 | di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev)); | |
194c011f | 451 | di->__pad1 = 0; |
194c011f SW |
452 | di->__pad2 = 0; |
453 | di->__pad3 = 0; | |
194c011f | 454 | memset(&di->__pad4, 0, sizeof(di->__pad4)); |
194c011f | 455 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); |
79ba7480 | 456 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
160b4026 | 457 | |
c9aecf73 | 458 | switch(ip->i_inode.i_mode & S_IFMT) { |
160b4026 | 459 | case S_IFDIR: |
e2d0a13b | 460 | gfs2_init_dir(dibh, dip); |
160b4026 SW |
461 | break; |
462 | case S_IFLNK: | |
c9aecf73 | 463 | memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size); |
160b4026 | 464 | break; |
e2d0a13b SW |
465 | } |
466 | ||
194c011f | 467 | set_buffer_uptodate(dibh); |
79ba7480 | 468 | brelse(dibh); |
194c011f SW |
469 | } |
470 | ||
194c011f | 471 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
fd4b4e04 | 472 | struct gfs2_inode *ip, int arq) |
194c011f SW |
473 | { |
474 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); | |
194c011f SW |
475 | int error; |
476 | ||
fd4b4e04 | 477 | if (arq) { |
28fb3027 | 478 | error = gfs2_quota_lock_check(dip); |
194c011f SW |
479 | if (error) |
480 | goto fail_quota_locks; | |
481 | ||
9dbe9610 | 482 | error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0); |
194c011f SW |
483 | if (error) |
484 | goto fail_quota_locks; | |
485 | ||
486 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + | |
54335b1f | 487 | dip->i_rgd->rd_length + |
194c011f SW |
488 | 2 * RES_DINODE + |
489 | RES_STATFS + RES_QUOTA, 0); | |
490 | if (error) | |
491 | goto fail_ipreserv; | |
492 | } else { | |
493 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); | |
494 | if (error) | |
495 | goto fail_quota_locks; | |
496 | } | |
497 | ||
498 | error = gfs2_dir_add(&dip->i_inode, name, ip); | |
499 | if (error) | |
500 | goto fail_end_trans; | |
501 | ||
194c011f SW |
502 | fail_end_trans: |
503 | gfs2_trans_end(sdp); | |
194c011f | 504 | fail_ipreserv: |
fd4b4e04 | 505 | gfs2_inplace_release(dip); |
194c011f SW |
506 | fail_quota_locks: |
507 | gfs2_quota_unlock(dip); | |
194c011f SW |
508 | return error; |
509 | } | |
510 | ||
46cc1e5f | 511 | static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array, |
9d8f13ba | 512 | void *fs_info) |
194c011f | 513 | { |
9d8f13ba MZ |
514 | const struct xattr *xattr; |
515 | int err = 0; | |
516 | ||
517 | for (xattr = xattr_array; xattr->name != NULL; xattr++) { | |
518 | err = __gfs2_xattr_set(inode, xattr->name, xattr->value, | |
519 | xattr->value_len, 0, | |
520 | GFS2_EATYPE_SECURITY); | |
521 | if (err < 0) | |
522 | break; | |
194c011f | 523 | } |
194c011f SW |
524 | return err; |
525 | } | |
b3b94faa | 526 | |
9d8f13ba MZ |
527 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, |
528 | const struct qstr *qstr) | |
529 | { | |
530 | return security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, | |
531 | &gfs2_initxattrs, NULL); | |
532 | } | |
533 | ||
194c011f | 534 | /** |
f2741d98 SW |
535 | * gfs2_create_inode - Create a new inode |
536 | * @dir: The parent directory | |
537 | * @dentry: The new dentry | |
6d4ade98 | 538 | * @file: If non-NULL, the file which is being opened |
f2741d98 SW |
539 | * @mode: The permissions on the new inode |
540 | * @dev: For device nodes, this is the device number | |
541 | * @symname: For symlinks, this is the link destination | |
542 | * @size: The initial size of the inode (ignored for directories) | |
194c011f | 543 | * |
f2741d98 | 544 | * Returns: 0 on success, or error code |
194c011f SW |
545 | */ |
546 | ||
f2741d98 | 547 | static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, |
6d4ade98 | 548 | struct file *file, |
175a4eb7 | 549 | umode_t mode, dev_t dev, const char *symname, |
6d4ade98 | 550 | unsigned int size, int excl, int *opened) |
194c011f | 551 | { |
f2741d98 SW |
552 | const struct qstr *name = &dentry->d_name; |
553 | struct gfs2_holder ghs[2]; | |
194c011f | 554 | struct inode *inode = NULL; |
8e2e0047 | 555 | struct gfs2_inode *dip = GFS2_I(dir), *ip; |
194c011f | 556 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
c9aecf73 | 557 | struct gfs2_glock *io_gl; |
6d4ade98 | 558 | struct dentry *d; |
194c011f | 559 | int error; |
9dbe9610 | 560 | u32 aflags = 0; |
fd4b4e04 | 561 | int arq; |
194c011f SW |
562 | |
563 | if (!name->len || name->len > GFS2_FNAMESIZE) | |
f2741d98 | 564 | return -ENAMETOOLONG; |
194c011f | 565 | |
0a305e49 BP |
566 | error = gfs2_rs_alloc(dip); |
567 | if (error) | |
568 | return error; | |
569 | ||
fd4b4e04 SW |
570 | error = gfs2_rindex_update(sdp); |
571 | if (error) | |
572 | return error; | |
573 | ||
f2741d98 | 574 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
194c011f SW |
575 | if (error) |
576 | goto fail; | |
577 | ||
578 | error = create_ok(dip, name, mode); | |
5a00f3cc SW |
579 | if (error) |
580 | goto fail_gunlock; | |
581 | ||
582 | inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl); | |
583 | error = PTR_ERR(inode); | |
584 | if (!IS_ERR(inode)) { | |
6d4ade98 SW |
585 | d = d_splice_alias(inode, dentry); |
586 | error = 0; | |
0d0d1107 | 587 | if (file) { |
6d4ade98 SW |
588 | if (d == NULL) |
589 | d = dentry; | |
590 | if (S_ISREG(inode->i_mode)) | |
591 | error = finish_open(file, d, gfs2_open_common, opened); | |
592 | else | |
593 | error = finish_no_open(file, d); | |
594 | } | |
9a63edd1 | 595 | gfs2_glock_dq_uninit(ghs); |
6d4ade98 | 596 | return error; |
5a00f3cc | 597 | } else if (error != -ENOENT) { |
194c011f | 598 | goto fail_gunlock; |
5a00f3cc | 599 | } |
194c011f | 600 | |
fd4b4e04 SW |
601 | arq = error = gfs2_diradd_alloc_required(dir, name); |
602 | if (error < 0) | |
603 | goto fail_gunlock; | |
604 | ||
c9aecf73 | 605 | inode = new_inode(sdp->sd_vfs); |
fd4b4e04 SW |
606 | error = -ENOMEM; |
607 | if (!inode) | |
608 | goto fail_gunlock; | |
609 | ||
c9aecf73 SW |
610 | ip = GFS2_I(inode); |
611 | error = gfs2_rs_alloc(ip); | |
194c011f | 612 | if (error) |
c9aecf73 SW |
613 | goto fail_free_inode; |
614 | ||
c9aecf73 | 615 | inode->i_mode = mode; |
79ba7480 | 616 | set_nlink(inode, S_ISDIR(mode) ? 2 : 1); |
c9aecf73 SW |
617 | inode->i_rdev = dev; |
618 | inode->i_size = size; | |
fd4b4e04 | 619 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
28fb3027 | 620 | gfs2_set_inode_blocks(inode, 1); |
c9aecf73 SW |
621 | munge_mode_uid_gid(dip, inode); |
622 | ip->i_goal = dip->i_goal; | |
28fb3027 SW |
623 | ip->i_diskflags = 0; |
624 | ip->i_eattr = 0; | |
625 | ip->i_height = 0; | |
626 | ip->i_depth = 0; | |
627 | ip->i_entries = 0; | |
628 | ||
629 | switch(mode & S_IFMT) { | |
630 | case S_IFREG: | |
631 | if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || | |
632 | gfs2_tune_get(sdp, gt_new_files_jdata)) | |
633 | ip->i_diskflags |= GFS2_DIF_JDATA; | |
634 | gfs2_set_aops(inode); | |
635 | break; | |
636 | case S_IFDIR: | |
637 | ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); | |
638 | ip->i_diskflags |= GFS2_DIF_JDATA; | |
639 | ip->i_entries = 2; | |
640 | break; | |
641 | } | |
642 | gfs2_set_inode_flags(inode); | |
194c011f | 643 | |
9dbe9610 SW |
644 | if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) || |
645 | (dip->i_diskflags & GFS2_DIF_TOPDIR)) | |
646 | aflags |= GFS2_AF_ORLOV; | |
647 | ||
648 | error = alloc_dinode(ip, aflags); | |
194c011f | 649 | if (error) |
c9aecf73 | 650 | goto fail_free_inode; |
194c011f | 651 | |
c9aecf73 | 652 | error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
194c011f | 653 | if (error) |
c9aecf73 | 654 | goto fail_free_inode; |
194c011f | 655 | |
1e2d9d44 | 656 | ip->i_gl->gl_object = ip; |
c9aecf73 SW |
657 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); |
658 | if (error) | |
659 | goto fail_free_inode; | |
660 | ||
fd4b4e04 | 661 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
c9aecf73 | 662 | if (error) |
194c011f SW |
663 | goto fail_gunlock2; |
664 | ||
79ba7480 | 665 | init_dinode(dip, ip, symname); |
fd4b4e04 SW |
666 | gfs2_trans_end(sdp); |
667 | ||
c9aecf73 | 668 | error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
194c011f SW |
669 | if (error) |
670 | goto fail_gunlock2; | |
671 | ||
c9aecf73 | 672 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); |
ff7f4cb4 SW |
673 | if (error) |
674 | goto fail_gunlock2; | |
0a305e49 | 675 | |
c9aecf73 SW |
676 | ip->i_iopen_gh.gh_gl->gl_object = ip; |
677 | gfs2_glock_put(io_gl); | |
678 | gfs2_set_iop(inode); | |
679 | insert_inode_hash(inode); | |
680 | ||
194c011f SW |
681 | error = gfs2_acl_create(dip, inode); |
682 | if (error) | |
c9aecf73 | 683 | goto fail_gunlock3; |
194c011f | 684 | |
8e2e0047 | 685 | error = gfs2_security_init(dip, ip, name); |
194c011f | 686 | if (error) |
c9aecf73 | 687 | goto fail_gunlock3; |
194c011f | 688 | |
fd4b4e04 | 689 | error = link_dinode(dip, name, ip, arq); |
194c011f | 690 | if (error) |
c9aecf73 | 691 | goto fail_gunlock3; |
194c011f | 692 | |
79ba7480 | 693 | mark_inode_dirty(inode); |
6d4ade98 SW |
694 | d_instantiate(dentry, inode); |
695 | if (file) | |
696 | error = finish_open(file, dentry, gfs2_open_common, opened); | |
28fb3027 SW |
697 | gfs2_glock_dq_uninit(ghs); |
698 | gfs2_glock_dq_uninit(ghs + 1); | |
6d4ade98 | 699 | return error; |
194c011f | 700 | |
c9aecf73 SW |
701 | fail_gunlock3: |
702 | gfs2_glock_dq_uninit(ghs + 1); | |
703 | if (ip->i_gl) | |
704 | gfs2_glock_put(ip->i_gl); | |
705 | goto fail_gunlock; | |
706 | ||
194c011f SW |
707 | fail_gunlock2: |
708 | gfs2_glock_dq_uninit(ghs + 1); | |
c9aecf73 SW |
709 | fail_free_inode: |
710 | if (ip->i_gl) | |
711 | gfs2_glock_put(ip->i_gl); | |
712 | gfs2_rs_delete(ip); | |
713 | free_inode_nonrcu(inode); | |
714 | inode = NULL; | |
194c011f | 715 | fail_gunlock: |
f2741d98 | 716 | gfs2_glock_dq_uninit(ghs); |
40ac218f | 717 | if (inode && !IS_ERR(inode)) { |
79ba7480 SW |
718 | clear_nlink(inode); |
719 | mark_inode_dirty(inode); | |
40ac218f SW |
720 | set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags); |
721 | iput(inode); | |
722 | } | |
194c011f | 723 | fail: |
f2741d98 | 724 | return error; |
194c011f | 725 | } |
f2741d98 | 726 | |
b3b94faa DT |
727 | /** |
728 | * gfs2_create - Create a file | |
729 | * @dir: The directory in which to create the file | |
730 | * @dentry: The dentry of the new file | |
731 | * @mode: The mode of the new file | |
732 | * | |
733 | * Returns: errno | |
734 | */ | |
735 | ||
736 | static int gfs2_create(struct inode *dir, struct dentry *dentry, | |
ebfc3b49 | 737 | umode_t mode, bool excl) |
b3b94faa | 738 | { |
6d4ade98 | 739 | return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL); |
b3b94faa DT |
740 | } |
741 | ||
742 | /** | |
6d4ade98 | 743 | * __gfs2_lookup - Look up a filename in a directory and return its inode |
b3b94faa DT |
744 | * @dir: The directory inode |
745 | * @dentry: The dentry of the new inode | |
6d4ade98 SW |
746 | * @file: File to be opened |
747 | * @opened: atomic_open flags | |
b3b94faa | 748 | * |
b3b94faa DT |
749 | * |
750 | * Returns: errno | |
751 | */ | |
752 | ||
6d4ade98 SW |
753 | static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry, |
754 | struct file *file, int *opened) | |
b3b94faa | 755 | { |
6d4ade98 SW |
756 | struct inode *inode; |
757 | struct dentry *d; | |
758 | struct gfs2_holder gh; | |
759 | struct gfs2_glock *gl; | |
760 | int error; | |
761 | ||
762 | inode = gfs2_lookupi(dir, &dentry->d_name, 0); | |
763 | if (!inode) | |
764 | return NULL; | |
765 | if (IS_ERR(inode)) | |
766 | return ERR_CAST(inode); | |
767 | ||
768 | gl = GFS2_I(inode)->i_gl; | |
769 | error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); | |
770 | if (error) { | |
771 | iput(inode); | |
772 | return ERR_PTR(error); | |
9656b2c1 | 773 | } |
6d4ade98 SW |
774 | |
775 | d = d_splice_alias(inode, dentry); | |
776 | if (file && S_ISREG(inode->i_mode)) | |
777 | error = finish_open(file, dentry, gfs2_open_common, opened); | |
778 | ||
779 | gfs2_glock_dq_uninit(&gh); | |
780 | if (error) | |
781 | return ERR_PTR(error); | |
782 | return d; | |
783 | } | |
784 | ||
785 | static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, | |
786 | unsigned flags) | |
787 | { | |
788 | return __gfs2_lookup(dir, dentry, NULL, NULL); | |
b3b94faa DT |
789 | } |
790 | ||
791 | /** | |
792 | * gfs2_link - Link to a file | |
793 | * @old_dentry: The inode to link | |
794 | * @dir: Add link to this directory | |
795 | * @dentry: The name of the link | |
796 | * | |
797 | * Link the inode in "old_dentry" into the directory "dir" with the | |
798 | * name in "dentry". | |
799 | * | |
800 | * Returns: errno | |
801 | */ | |
802 | ||
803 | static int gfs2_link(struct dentry *old_dentry, struct inode *dir, | |
804 | struct dentry *dentry) | |
805 | { | |
feaa7bba SW |
806 | struct gfs2_inode *dip = GFS2_I(dir); |
807 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
b3b94faa | 808 | struct inode *inode = old_dentry->d_inode; |
feaa7bba | 809 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa | 810 | struct gfs2_holder ghs[2]; |
2baee03f | 811 | struct buffer_head *dibh; |
b3b94faa DT |
812 | int alloc_required; |
813 | int error; | |
814 | ||
b60623c2 | 815 | if (S_ISDIR(inode->i_mode)) |
b3b94faa DT |
816 | return -EPERM; |
817 | ||
0a305e49 BP |
818 | error = gfs2_rs_alloc(dip); |
819 | if (error) | |
820 | return error; | |
821 | ||
b3b94faa DT |
822 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
823 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); | |
824 | ||
72dbf479 BP |
825 | error = gfs2_glock_nq(ghs); /* parent */ |
826 | if (error) | |
827 | goto out_parent; | |
828 | ||
829 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
b3b94faa | 830 | if (error) |
72dbf479 | 831 | goto out_child; |
b3b94faa | 832 | |
d192a8e5 SW |
833 | error = -ENOENT; |
834 | if (inode->i_nlink == 0) | |
835 | goto out_gunlock; | |
836 | ||
10556cb2 | 837 | error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC); |
b3b94faa DT |
838 | if (error) |
839 | goto out_gunlock; | |
840 | ||
dbb7cae2 | 841 | error = gfs2_dir_check(dir, &dentry->d_name, NULL); |
b3b94faa DT |
842 | switch (error) { |
843 | case -ENOENT: | |
844 | break; | |
845 | case 0: | |
846 | error = -EEXIST; | |
847 | default: | |
848 | goto out_gunlock; | |
849 | } | |
850 | ||
851 | error = -EINVAL; | |
4f56110a | 852 | if (!dip->i_inode.i_nlink) |
b3b94faa DT |
853 | goto out_gunlock; |
854 | error = -EFBIG; | |
ad6203f2 | 855 | if (dip->i_entries == (u32)-1) |
b3b94faa DT |
856 | goto out_gunlock; |
857 | error = -EPERM; | |
858 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
859 | goto out_gunlock; | |
860 | error = -EINVAL; | |
4f56110a | 861 | if (!ip->i_inode.i_nlink) |
b3b94faa DT |
862 | goto out_gunlock; |
863 | error = -EMLINK; | |
4f56110a | 864 | if (ip->i_inode.i_nlink == (u32)-1) |
b3b94faa DT |
865 | goto out_gunlock; |
866 | ||
c752666c SW |
867 | alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); |
868 | if (error < 0) | |
b3b94faa | 869 | goto out_gunlock; |
c752666c | 870 | error = 0; |
b3b94faa DT |
871 | |
872 | if (alloc_required) { | |
d82661d9 | 873 | error = gfs2_quota_lock_check(dip); |
b3b94faa | 874 | if (error) |
5407e242 | 875 | goto out_gunlock; |
b3b94faa | 876 | |
9dbe9610 | 877 | error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0); |
b3b94faa DT |
878 | if (error) |
879 | goto out_gunlock_q; | |
880 | ||
1b50259b | 881 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
71f890f7 | 882 | gfs2_rg_blocks(dip, sdp->sd_max_dirres) + |
b3b94faa DT |
883 | 2 * RES_DINODE + RES_STATFS + |
884 | RES_QUOTA, 0); | |
885 | if (error) | |
886 | goto out_ipres; | |
887 | } else { | |
888 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); | |
889 | if (error) | |
890 | goto out_ipres; | |
891 | } | |
892 | ||
2baee03f | 893 | error = gfs2_meta_inode_buffer(ip, &dibh); |
b3b94faa DT |
894 | if (error) |
895 | goto out_end_trans; | |
896 | ||
3d6ecb7d | 897 | error = gfs2_dir_add(dir, &dentry->d_name, ip); |
2baee03f SW |
898 | if (error) |
899 | goto out_brelse; | |
900 | ||
350a9b0a | 901 | gfs2_trans_add_meta(ip->i_gl, dibh); |
2baee03f SW |
902 | inc_nlink(&ip->i_inode); |
903 | ip->i_inode.i_ctime = CURRENT_TIME; | |
ab9bbda0 SW |
904 | ihold(inode); |
905 | d_instantiate(dentry, inode); | |
906 | mark_inode_dirty(inode); | |
b3b94faa | 907 | |
2baee03f SW |
908 | out_brelse: |
909 | brelse(dibh); | |
feaa7bba | 910 | out_end_trans: |
b3b94faa | 911 | gfs2_trans_end(sdp); |
feaa7bba | 912 | out_ipres: |
b3b94faa DT |
913 | if (alloc_required) |
914 | gfs2_inplace_release(dip); | |
feaa7bba | 915 | out_gunlock_q: |
b3b94faa DT |
916 | if (alloc_required) |
917 | gfs2_quota_unlock(dip); | |
feaa7bba | 918 | out_gunlock: |
72dbf479 BP |
919 | gfs2_glock_dq(ghs + 1); |
920 | out_child: | |
921 | gfs2_glock_dq(ghs); | |
922 | out_parent: | |
b3b94faa DT |
923 | gfs2_holder_uninit(ghs); |
924 | gfs2_holder_uninit(ghs + 1); | |
b3b94faa DT |
925 | return error; |
926 | } | |
927 | ||
87ec2174 SW |
928 | /* |
929 | * gfs2_unlink_ok - check to see that a inode is still in a directory | |
930 | * @dip: the directory | |
931 | * @name: the name of the file | |
932 | * @ip: the inode | |
933 | * | |
934 | * Assumes that the lock on (at least) @dip is held. | |
935 | * | |
936 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't | |
937 | */ | |
938 | ||
939 | static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, | |
940 | const struct gfs2_inode *ip) | |
941 | { | |
942 | int error; | |
943 | ||
944 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) | |
945 | return -EPERM; | |
946 | ||
947 | if ((dip->i_inode.i_mode & S_ISVTX) && | |
6b24c0d2 EB |
948 | !uid_eq(dip->i_inode.i_uid, current_fsuid()) && |
949 | !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER)) | |
87ec2174 SW |
950 | return -EPERM; |
951 | ||
952 | if (IS_APPEND(&dip->i_inode)) | |
953 | return -EPERM; | |
954 | ||
10556cb2 | 955 | error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); |
87ec2174 SW |
956 | if (error) |
957 | return error; | |
958 | ||
959 | error = gfs2_dir_check(&dip->i_inode, name, ip); | |
960 | if (error) | |
961 | return error; | |
962 | ||
963 | return 0; | |
964 | } | |
965 | ||
b3b94faa | 966 | /** |
855d23ce SW |
967 | * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it |
968 | * @dip: The parent directory | |
969 | * @name: The name of the entry in the parent directory | |
855d23ce SW |
970 | * @inode: The inode to be removed |
971 | * | |
972 | * Called with all the locks and in a transaction. This will only be | |
973 | * called for a directory after it has been checked to ensure it is empty. | |
974 | * | |
975 | * Returns: 0 on success, or an error | |
976 | */ | |
977 | ||
978 | static int gfs2_unlink_inode(struct gfs2_inode *dip, | |
4327a9bf | 979 | const struct dentry *dentry) |
855d23ce SW |
980 | { |
981 | struct inode *inode = dentry->d_inode; | |
982 | struct gfs2_inode *ip = GFS2_I(inode); | |
983 | int error; | |
984 | ||
985 | error = gfs2_dir_del(dip, dentry); | |
986 | if (error) | |
987 | return error; | |
988 | ||
989 | ip->i_entries = 0; | |
990 | inode->i_ctime = CURRENT_TIME; | |
991 | if (S_ISDIR(inode->i_mode)) | |
992 | clear_nlink(inode); | |
993 | else | |
994 | drop_nlink(inode); | |
855d23ce SW |
995 | mark_inode_dirty(inode); |
996 | if (inode->i_nlink == 0) | |
997 | gfs2_unlink_di(inode); | |
998 | return 0; | |
999 | } | |
1000 | ||
1001 | ||
1002 | /** | |
1003 | * gfs2_unlink - Unlink an inode (this does rmdir as well) | |
1004 | * @dir: The inode of the directory containing the inode to unlink | |
b3b94faa DT |
1005 | * @dentry: The file itself |
1006 | * | |
855d23ce SW |
1007 | * This routine uses the type of the inode as a flag to figure out |
1008 | * whether this is an unlink or an rmdir. | |
b3b94faa DT |
1009 | * |
1010 | * Returns: errno | |
1011 | */ | |
1012 | ||
1013 | static int gfs2_unlink(struct inode *dir, struct dentry *dentry) | |
1014 | { | |
feaa7bba SW |
1015 | struct gfs2_inode *dip = GFS2_I(dir); |
1016 | struct gfs2_sbd *sdp = GFS2_SB(dir); | |
855d23ce SW |
1017 | struct inode *inode = dentry->d_inode; |
1018 | struct gfs2_inode *ip = GFS2_I(inode); | |
ddee7608 RC |
1019 | struct gfs2_holder ghs[3]; |
1020 | struct gfs2_rgrpd *rgd; | |
5e2f7d61 BP |
1021 | int error; |
1022 | ||
1023 | error = gfs2_rindex_update(sdp); | |
1024 | if (error) | |
1025 | return error; | |
1026 | ||
1027 | error = -EROFS; | |
b3b94faa | 1028 | |
b3b94faa | 1029 | gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
ddee7608 | 1030 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); |
b3b94faa | 1031 | |
66fc061b | 1032 | rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1); |
a365fbf3 | 1033 | if (!rgd) |
87654896 | 1034 | goto out_inodes; |
a365fbf3 | 1035 | |
ddee7608 RC |
1036 | gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); |
1037 | ||
1038 | ||
8497a46e | 1039 | error = gfs2_glock_nq(ghs); /* parent */ |
b3b94faa | 1040 | if (error) |
8497a46e SW |
1041 | goto out_parent; |
1042 | ||
1043 | error = gfs2_glock_nq(ghs + 1); /* child */ | |
1044 | if (error) | |
1045 | goto out_child; | |
1046 | ||
d192a8e5 | 1047 | error = -ENOENT; |
855d23ce | 1048 | if (inode->i_nlink == 0) |
d192a8e5 SW |
1049 | goto out_rgrp; |
1050 | ||
855d23ce SW |
1051 | if (S_ISDIR(inode->i_mode)) { |
1052 | error = -ENOTEMPTY; | |
1053 | if (ip->i_entries > 2 || inode->i_nlink > 2) | |
1054 | goto out_rgrp; | |
1055 | } | |
1056 | ||
8497a46e SW |
1057 | error = gfs2_glock_nq(ghs + 2); /* rgrp */ |
1058 | if (error) | |
1059 | goto out_rgrp; | |
b3b94faa DT |
1060 | |
1061 | error = gfs2_unlink_ok(dip, &dentry->d_name, ip); | |
1062 | if (error) | |
72dbf479 | 1063 | goto out_gunlock; |
b3b94faa | 1064 | |
855d23ce | 1065 | error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); |
855d23ce SW |
1066 | if (error) |
1067 | goto out_end_trans; | |
b3b94faa | 1068 | |
4327a9bf | 1069 | error = gfs2_unlink_inode(dip, dentry); |
b3b94faa | 1070 | |
feaa7bba SW |
1071 | out_end_trans: |
1072 | gfs2_trans_end(sdp); | |
72dbf479 | 1073 | out_gunlock: |
8497a46e SW |
1074 | gfs2_glock_dq(ghs + 2); |
1075 | out_rgrp: | |
8497a46e SW |
1076 | gfs2_glock_dq(ghs + 1); |
1077 | out_child: | |
8497a46e SW |
1078 | gfs2_glock_dq(ghs); |
1079 | out_parent: | |
87654896 SW |
1080 | gfs2_holder_uninit(ghs + 2); |
1081 | out_inodes: | |
1082 | gfs2_holder_uninit(ghs + 1); | |
8497a46e | 1083 | gfs2_holder_uninit(ghs); |
b3b94faa DT |
1084 | return error; |
1085 | } | |
1086 | ||
1087 | /** | |
1088 | * gfs2_symlink - Create a symlink | |
1089 | * @dir: The directory to create the symlink in | |
1090 | * @dentry: The dentry to put the symlink in | |
1091 | * @symname: The thing which the link points to | |
1092 | * | |
1093 | * Returns: errno | |
1094 | */ | |
1095 | ||
1096 | static int gfs2_symlink(struct inode *dir, struct dentry *dentry, | |
1097 | const char *symname) | |
1098 | { | |
feaa7bba | 1099 | struct gfs2_sbd *sdp = GFS2_SB(dir); |
160b4026 | 1100 | unsigned int size; |
b3b94faa | 1101 | |
b3b94faa DT |
1102 | size = strlen(symname); |
1103 | if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) | |
1104 | return -ENAMETOOLONG; | |
1105 | ||
6d4ade98 | 1106 | return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL); |
b3b94faa DT |
1107 | } |
1108 | ||
1109 | /** | |
1110 | * gfs2_mkdir - Make a directory | |
1111 | * @dir: The parent directory of the new one | |
1112 | * @dentry: The dentry of the new directory | |
1113 | * @mode: The mode of the new directory | |
1114 | * | |
1115 | * Returns: errno | |
1116 | */ | |
1117 | ||
18bb1db3 | 1118 | static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
b3b94faa | 1119 | { |
28fb3027 SW |
1120 | struct gfs2_sbd *sdp = GFS2_SB(dir); |
1121 | unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode); | |
6d4ade98 | 1122 | return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL); |
b3b94faa DT |
1123 | } |
1124 | ||
b3b94faa DT |
1125 | /** |
1126 | * gfs2_mknod - Make a special file | |
1127 | * @dir: The directory in which the special file will reside | |
1128 | * @dentry: The dentry of the special file | |
1129 | * @mode: The mode of the special file | |
f2741d98 | 1130 | * @dev: The device specification of the special file |
b3b94faa DT |
1131 | * |
1132 | */ | |
1133 | ||
1a67aafb | 1134 | static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, |
b3b94faa DT |
1135 | dev_t dev) |
1136 | { | |
6d4ade98 SW |
1137 | return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL); |
1138 | } | |
1139 | ||
1140 | /** | |
1141 | * gfs2_atomic_open - Atomically open a file | |
1142 | * @dir: The directory | |
1143 | * @dentry: The proposed new entry | |
1144 | * @file: The proposed new struct file | |
1145 | * @flags: open flags | |
1146 | * @mode: File mode | |
1147 | * @opened: Flag to say whether the file has been opened or not | |
1148 | * | |
1149 | * Returns: error code or 0 for success | |
1150 | */ | |
1151 | ||
1152 | static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry, | |
1153 | struct file *file, unsigned flags, | |
1154 | umode_t mode, int *opened) | |
1155 | { | |
1156 | struct dentry *d; | |
1157 | bool excl = !!(flags & O_EXCL); | |
1158 | ||
1159 | d = __gfs2_lookup(dir, dentry, file, opened); | |
1160 | if (IS_ERR(d)) | |
1161 | return PTR_ERR(d); | |
1162 | if (d == NULL) | |
1163 | d = dentry; | |
1164 | if (d->d_inode) { | |
1165 | if (!(*opened & FILE_OPENED)) | |
1166 | return finish_no_open(file, d); | |
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | if (!(flags & O_CREAT)) | |
1171 | return -ENOENT; | |
1172 | ||
1173 | return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened); | |
b3b94faa DT |
1174 | } |
1175 | ||
0188d6c5 SW |
1176 | /* |
1177 | * gfs2_ok_to_move - check if it's ok to move a directory to another directory | |
1178 | * @this: move this | |
1179 | * @to: to here | |
1180 | * | |
1181 | * Follow @to back to the root and make sure we don't encounter @this | |
1182 | * Assumes we already hold the rename lock. | |
1183 | * | |
1184 | * Returns: errno | |
1185 | */ | |
1186 | ||
1187 | static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) | |
1188 | { | |
1189 | struct inode *dir = &to->i_inode; | |
1190 | struct super_block *sb = dir->i_sb; | |
1191 | struct inode *tmp; | |
0188d6c5 SW |
1192 | int error = 0; |
1193 | ||
0188d6c5 SW |
1194 | igrab(dir); |
1195 | ||
1196 | for (;;) { | |
1197 | if (dir == &this->i_inode) { | |
1198 | error = -EINVAL; | |
1199 | break; | |
1200 | } | |
1201 | if (dir == sb->s_root->d_inode) { | |
1202 | error = 0; | |
1203 | break; | |
1204 | } | |
1205 | ||
8d123585 | 1206 | tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); |
0188d6c5 SW |
1207 | if (IS_ERR(tmp)) { |
1208 | error = PTR_ERR(tmp); | |
1209 | break; | |
1210 | } | |
1211 | ||
1212 | iput(dir); | |
1213 | dir = tmp; | |
1214 | } | |
1215 | ||
1216 | iput(dir); | |
1217 | ||
1218 | return error; | |
1219 | } | |
1220 | ||
b3b94faa DT |
1221 | /** |
1222 | * gfs2_rename - Rename a file | |
1223 | * @odir: Parent directory of old file name | |
1224 | * @odentry: The old dentry of the file | |
1225 | * @ndir: Parent directory of new file name | |
1226 | * @ndentry: The new dentry of the file | |
1227 | * | |
1228 | * Returns: errno | |
1229 | */ | |
1230 | ||
1231 | static int gfs2_rename(struct inode *odir, struct dentry *odentry, | |
1232 | struct inode *ndir, struct dentry *ndentry) | |
1233 | { | |
feaa7bba SW |
1234 | struct gfs2_inode *odip = GFS2_I(odir); |
1235 | struct gfs2_inode *ndip = GFS2_I(ndir); | |
1236 | struct gfs2_inode *ip = GFS2_I(odentry->d_inode); | |
b3b94faa | 1237 | struct gfs2_inode *nip = NULL; |
feaa7bba | 1238 | struct gfs2_sbd *sdp = GFS2_SB(odir); |
8339ee54 | 1239 | struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }; |
ddee7608 | 1240 | struct gfs2_rgrpd *nrgd; |
b3b94faa DT |
1241 | unsigned int num_gh; |
1242 | int dir_rename = 0; | |
24b977b5 | 1243 | int alloc_required = 0; |
b3b94faa DT |
1244 | unsigned int x; |
1245 | int error; | |
1246 | ||
b3b94faa | 1247 | if (ndentry->d_inode) { |
feaa7bba | 1248 | nip = GFS2_I(ndentry->d_inode); |
b3b94faa DT |
1249 | if (ip == nip) |
1250 | return 0; | |
1251 | } | |
1252 | ||
5e2f7d61 BP |
1253 | error = gfs2_rindex_update(sdp); |
1254 | if (error) | |
1255 | return error; | |
1256 | ||
0a305e49 BP |
1257 | error = gfs2_rs_alloc(ndip); |
1258 | if (error) | |
1259 | return error; | |
1260 | ||
0188d6c5 SW |
1261 | if (odip != ndip) { |
1262 | error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, | |
1263 | 0, &r_gh); | |
b3b94faa DT |
1264 | if (error) |
1265 | goto out; | |
1266 | ||
0188d6c5 SW |
1267 | if (S_ISDIR(ip->i_inode.i_mode)) { |
1268 | dir_rename = 1; | |
1269 | /* don't move a dirctory into it's subdir */ | |
1270 | error = gfs2_ok_to_move(ip, ndip); | |
1271 | if (error) | |
1272 | goto out_gunlock_r; | |
1273 | } | |
b3b94faa DT |
1274 | } |
1275 | ||
d9d1ca30 | 1276 | num_gh = 1; |
b3b94faa | 1277 | gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); |
d9d1ca30 SW |
1278 | if (odip != ndip) { |
1279 | gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1280 | num_gh++; | |
1281 | } | |
1282 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1283 | num_gh++; | |
b3b94faa | 1284 | |
d9d1ca30 SW |
1285 | if (nip) { |
1286 | gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); | |
1287 | num_gh++; | |
ddee7608 RC |
1288 | /* grab the resource lock for unlink flag twiddling |
1289 | * this is the case of the target file already existing | |
1290 | * so we unlink before doing the rename | |
1291 | */ | |
66fc061b | 1292 | nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1); |
ddee7608 RC |
1293 | if (nrgd) |
1294 | gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); | |
d9d1ca30 | 1295 | } |
b3b94faa | 1296 | |
72dbf479 BP |
1297 | for (x = 0; x < num_gh; x++) { |
1298 | error = gfs2_glock_nq(ghs + x); | |
1299 | if (error) | |
1300 | goto out_gunlock; | |
1301 | } | |
b3b94faa | 1302 | |
d192a8e5 SW |
1303 | error = -ENOENT; |
1304 | if (ip->i_inode.i_nlink == 0) | |
1305 | goto out_gunlock; | |
1306 | ||
b3b94faa DT |
1307 | /* Check out the old directory */ |
1308 | ||
1309 | error = gfs2_unlink_ok(odip, &odentry->d_name, ip); | |
1310 | if (error) | |
1311 | goto out_gunlock; | |
1312 | ||
1313 | /* Check out the new directory */ | |
1314 | ||
1315 | if (nip) { | |
1316 | error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); | |
1317 | if (error) | |
1318 | goto out_gunlock; | |
1319 | ||
d192a8e5 SW |
1320 | if (nip->i_inode.i_nlink == 0) { |
1321 | error = -EAGAIN; | |
1322 | goto out_gunlock; | |
1323 | } | |
1324 | ||
b60623c2 | 1325 | if (S_ISDIR(nip->i_inode.i_mode)) { |
ad6203f2 | 1326 | if (nip->i_entries < 2) { |
94fb763b | 1327 | gfs2_consist_inode(nip); |
b3b94faa DT |
1328 | error = -EIO; |
1329 | goto out_gunlock; | |
1330 | } | |
ad6203f2 | 1331 | if (nip->i_entries > 2) { |
b3b94faa DT |
1332 | error = -ENOTEMPTY; |
1333 | goto out_gunlock; | |
1334 | } | |
1335 | } | |
1336 | } else { | |
10556cb2 | 1337 | error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC); |
b3b94faa DT |
1338 | if (error) |
1339 | goto out_gunlock; | |
1340 | ||
dbb7cae2 | 1341 | error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); |
b3b94faa DT |
1342 | switch (error) { |
1343 | case -ENOENT: | |
1344 | error = 0; | |
1345 | break; | |
1346 | case 0: | |
1347 | error = -EEXIST; | |
1348 | default: | |
1349 | goto out_gunlock; | |
1350 | }; | |
1351 | ||
1352 | if (odip != ndip) { | |
4f56110a | 1353 | if (!ndip->i_inode.i_nlink) { |
d192a8e5 | 1354 | error = -ENOENT; |
b3b94faa DT |
1355 | goto out_gunlock; |
1356 | } | |
ad6203f2 | 1357 | if (ndip->i_entries == (u32)-1) { |
b3b94faa DT |
1358 | error = -EFBIG; |
1359 | goto out_gunlock; | |
1360 | } | |
b60623c2 | 1361 | if (S_ISDIR(ip->i_inode.i_mode) && |
4f56110a | 1362 | ndip->i_inode.i_nlink == (u32)-1) { |
b3b94faa DT |
1363 | error = -EMLINK; |
1364 | goto out_gunlock; | |
1365 | } | |
1366 | } | |
1367 | } | |
1368 | ||
1369 | /* Check out the dir to be renamed */ | |
1370 | ||
1371 | if (dir_rename) { | |
10556cb2 | 1372 | error = gfs2_permission(odentry->d_inode, MAY_WRITE); |
b3b94faa DT |
1373 | if (error) |
1374 | goto out_gunlock; | |
1375 | } | |
1376 | ||
24b977b5 SW |
1377 | if (nip == NULL) |
1378 | alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); | |
1379 | error = alloc_required; | |
c752666c | 1380 | if (error < 0) |
b3b94faa DT |
1381 | goto out_gunlock; |
1382 | ||
1383 | if (alloc_required) { | |
d82661d9 | 1384 | error = gfs2_quota_lock_check(ndip); |
b3b94faa | 1385 | if (error) |
5407e242 | 1386 | goto out_gunlock; |
b3b94faa | 1387 | |
9dbe9610 | 1388 | error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres, 0); |
b3b94faa DT |
1389 | if (error) |
1390 | goto out_gunlock_q; | |
1391 | ||
fe1bdedc | 1392 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
71f890f7 | 1393 | gfs2_rg_blocks(ndip, sdp->sd_max_dirres) + |
b3b94faa | 1394 | 4 * RES_DINODE + 4 * RES_LEAF + |
87d21e07 | 1395 | RES_STATFS + RES_QUOTA + 4, 0); |
b3b94faa DT |
1396 | if (error) |
1397 | goto out_ipreserv; | |
1398 | } else { | |
1399 | error = gfs2_trans_begin(sdp, 4 * RES_DINODE + | |
87d21e07 | 1400 | 5 * RES_LEAF + 4, 0); |
b3b94faa DT |
1401 | if (error) |
1402 | goto out_gunlock; | |
1403 | } | |
1404 | ||
1405 | /* Remove the target file, if it exists */ | |
1406 | ||
4327a9bf BP |
1407 | if (nip) |
1408 | error = gfs2_unlink_inode(ndip, ndentry); | |
b3b94faa DT |
1409 | |
1410 | if (dir_rename) { | |
8d123585 | 1411 | error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); |
b3b94faa DT |
1412 | if (error) |
1413 | goto out_end_trans; | |
1414 | } else { | |
1415 | struct buffer_head *dibh; | |
1416 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
1417 | if (error) | |
1418 | goto out_end_trans; | |
4bd91ba1 | 1419 | ip->i_inode.i_ctime = CURRENT_TIME; |
350a9b0a | 1420 | gfs2_trans_add_meta(ip->i_gl, dibh); |
539e5d6b | 1421 | gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa DT |
1422 | brelse(dibh); |
1423 | } | |
1424 | ||
855d23ce | 1425 | error = gfs2_dir_del(odip, odentry); |
b3b94faa DT |
1426 | if (error) |
1427 | goto out_end_trans; | |
1428 | ||
3d6ecb7d | 1429 | error = gfs2_dir_add(ndir, &ndentry->d_name, ip); |
b3b94faa DT |
1430 | if (error) |
1431 | goto out_end_trans; | |
1432 | ||
feaa7bba | 1433 | out_end_trans: |
b3b94faa | 1434 | gfs2_trans_end(sdp); |
feaa7bba | 1435 | out_ipreserv: |
b3b94faa DT |
1436 | if (alloc_required) |
1437 | gfs2_inplace_release(ndip); | |
feaa7bba | 1438 | out_gunlock_q: |
b3b94faa DT |
1439 | if (alloc_required) |
1440 | gfs2_quota_unlock(ndip); | |
feaa7bba | 1441 | out_gunlock: |
72dbf479 BP |
1442 | while (x--) { |
1443 | gfs2_glock_dq(ghs + x); | |
b3b94faa | 1444 | gfs2_holder_uninit(ghs + x); |
72dbf479 | 1445 | } |
feaa7bba | 1446 | out_gunlock_r: |
0188d6c5 | 1447 | if (r_gh.gh_gl) |
b3b94faa | 1448 | gfs2_glock_dq_uninit(&r_gh); |
feaa7bba | 1449 | out: |
b3b94faa DT |
1450 | return error; |
1451 | } | |
1452 | ||
536baf02 | 1453 | /** |
c177c2ac AV |
1454 | * gfs2_follow_link - Follow a symbolic link |
1455 | * @dentry: The dentry of the link | |
1456 | * @nd: Data that we pass to vfs_follow_link() | |
536baf02 | 1457 | * |
c177c2ac | 1458 | * This can handle symlinks of any size. |
536baf02 | 1459 | * |
c177c2ac | 1460 | * Returns: 0 on success or error code |
536baf02 SW |
1461 | */ |
1462 | ||
c177c2ac | 1463 | static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) |
536baf02 | 1464 | { |
c177c2ac | 1465 | struct gfs2_inode *ip = GFS2_I(dentry->d_inode); |
536baf02 SW |
1466 | struct gfs2_holder i_gh; |
1467 | struct buffer_head *dibh; | |
160b4026 | 1468 | unsigned int size; |
c177c2ac | 1469 | char *buf; |
536baf02 SW |
1470 | int error; |
1471 | ||
1472 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); | |
1473 | error = gfs2_glock_nq(&i_gh); | |
1474 | if (error) { | |
1475 | gfs2_holder_uninit(&i_gh); | |
c177c2ac AV |
1476 | nd_set_link(nd, ERR_PTR(error)); |
1477 | return NULL; | |
536baf02 SW |
1478 | } |
1479 | ||
a2e0f799 SW |
1480 | size = (unsigned int)i_size_read(&ip->i_inode); |
1481 | if (size == 0) { | |
536baf02 | 1482 | gfs2_consist_inode(ip); |
c177c2ac | 1483 | buf = ERR_PTR(-EIO); |
536baf02 SW |
1484 | goto out; |
1485 | } | |
1486 | ||
1487 | error = gfs2_meta_inode_buffer(ip, &dibh); | |
c177c2ac AV |
1488 | if (error) { |
1489 | buf = ERR_PTR(error); | |
536baf02 | 1490 | goto out; |
536baf02 SW |
1491 | } |
1492 | ||
160b4026 | 1493 | buf = kzalloc(size + 1, GFP_NOFS); |
c177c2ac AV |
1494 | if (!buf) |
1495 | buf = ERR_PTR(-ENOMEM); | |
1496 | else | |
160b4026 | 1497 | memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); |
536baf02 SW |
1498 | brelse(dibh); |
1499 | out: | |
1500 | gfs2_glock_dq_uninit(&i_gh); | |
c177c2ac AV |
1501 | nd_set_link(nd, buf); |
1502 | return NULL; | |
b3b94faa DT |
1503 | } |
1504 | ||
c177c2ac | 1505 | static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
b3b94faa | 1506 | { |
c177c2ac AV |
1507 | char *s = nd_get_link(nd); |
1508 | if (!IS_ERR(s)) | |
1509 | kfree(s); | |
b3b94faa DT |
1510 | } |
1511 | ||
1512 | /** | |
1513 | * gfs2_permission - | |
75d5cfbe SW |
1514 | * @inode: The inode |
1515 | * @mask: The mask to be tested | |
1516 | * @flags: Indicates whether this is an RCU path walk or not | |
b3b94faa | 1517 | * |
300c7d75 SW |
1518 | * This may be called from the VFS directly, or from within GFS2 with the |
1519 | * inode locked, so we look to see if the glock is already locked and only | |
1520 | * lock the glock if its not already been done. | |
1521 | * | |
b3b94faa DT |
1522 | * Returns: errno |
1523 | */ | |
1524 | ||
10556cb2 | 1525 | int gfs2_permission(struct inode *inode, int mask) |
b3b94faa | 1526 | { |
b74c79e9 | 1527 | struct gfs2_inode *ip; |
b3b94faa DT |
1528 | struct gfs2_holder i_gh; |
1529 | int error; | |
300c7d75 | 1530 | int unlock = 0; |
b3b94faa | 1531 | |
b74c79e9 NP |
1532 | |
1533 | ip = GFS2_I(inode); | |
7afd88d9 | 1534 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
10556cb2 | 1535 | if (mask & MAY_NOT_BLOCK) |
75d5cfbe | 1536 | return -ECHILD; |
300c7d75 SW |
1537 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
1538 | if (error) | |
1539 | return error; | |
1540 | unlock = 1; | |
1541 | } | |
b3b94faa | 1542 | |
f58ba889 MS |
1543 | if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) |
1544 | error = -EACCES; | |
1545 | else | |
2830ba7f | 1546 | error = generic_permission(inode, mask); |
300c7d75 | 1547 | if (unlock) |
b3b94faa | 1548 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1549 | |
1550 | return error; | |
1551 | } | |
1552 | ||
ab9bbda0 | 1553 | static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr) |
194c011f | 1554 | { |
194c011f SW |
1555 | setattr_copy(inode, attr); |
1556 | mark_inode_dirty(inode); | |
194c011f SW |
1557 | return 0; |
1558 | } | |
1559 | ||
1560 | /** | |
1561 | * gfs2_setattr_simple - | |
1562 | * @ip: | |
1563 | * @attr: | |
1564 | * | |
1565 | * Returns: errno | |
1566 | */ | |
1567 | ||
ab9bbda0 | 1568 | int gfs2_setattr_simple(struct inode *inode, struct iattr *attr) |
194c011f SW |
1569 | { |
1570 | int error; | |
1571 | ||
1572 | if (current->journal_info) | |
ab9bbda0 | 1573 | return __gfs2_setattr_simple(inode, attr); |
194c011f | 1574 | |
ab9bbda0 | 1575 | error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0); |
194c011f SW |
1576 | if (error) |
1577 | return error; | |
1578 | ||
ab9bbda0 SW |
1579 | error = __gfs2_setattr_simple(inode, attr); |
1580 | gfs2_trans_end(GFS2_SB(inode)); | |
194c011f SW |
1581 | return error; |
1582 | } | |
1583 | ||
b3b94faa DT |
1584 | static int setattr_chown(struct inode *inode, struct iattr *attr) |
1585 | { | |
feaa7bba SW |
1586 | struct gfs2_inode *ip = GFS2_I(inode); |
1587 | struct gfs2_sbd *sdp = GFS2_SB(inode); | |
7c06b5d6 EB |
1588 | kuid_t ouid, nuid; |
1589 | kgid_t ogid, ngid; | |
b3b94faa DT |
1590 | int error; |
1591 | ||
2933f925 SW |
1592 | ouid = inode->i_uid; |
1593 | ogid = inode->i_gid; | |
b3b94faa DT |
1594 | nuid = attr->ia_uid; |
1595 | ngid = attr->ia_gid; | |
1596 | ||
6b24c0d2 | 1597 | if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid)) |
f4108a60 | 1598 | ouid = nuid = NO_UID_QUOTA_CHANGE; |
6b24c0d2 | 1599 | if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid)) |
f4108a60 | 1600 | ogid = ngid = NO_GID_QUOTA_CHANGE; |
b3b94faa | 1601 | |
b3b94faa DT |
1602 | error = gfs2_quota_lock(ip, nuid, ngid); |
1603 | if (error) | |
5407e242 | 1604 | return error; |
b3b94faa | 1605 | |
6b24c0d2 EB |
1606 | if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || |
1607 | !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { | |
b3b94faa DT |
1608 | error = gfs2_quota_check(ip, nuid, ngid); |
1609 | if (error) | |
1610 | goto out_gunlock_q; | |
1611 | } | |
1612 | ||
1613 | error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); | |
1614 | if (error) | |
1615 | goto out_gunlock_q; | |
1616 | ||
ab9bbda0 | 1617 | error = gfs2_setattr_simple(inode, attr); |
b3b94faa DT |
1618 | if (error) |
1619 | goto out_end_trans; | |
1620 | ||
6b24c0d2 EB |
1621 | if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) || |
1622 | !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) { | |
77658aad SW |
1623 | u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); |
1624 | gfs2_quota_change(ip, -blocks, ouid, ogid); | |
1625 | gfs2_quota_change(ip, blocks, nuid, ngid); | |
b3b94faa DT |
1626 | } |
1627 | ||
a91ea69f | 1628 | out_end_trans: |
b3b94faa | 1629 | gfs2_trans_end(sdp); |
a91ea69f | 1630 | out_gunlock_q: |
b3b94faa | 1631 | gfs2_quota_unlock(ip); |
b3b94faa DT |
1632 | return error; |
1633 | } | |
1634 | ||
1635 | /** | |
1636 | * gfs2_setattr - Change attributes on an inode | |
1637 | * @dentry: The dentry which is changing | |
1638 | * @attr: The structure describing the change | |
1639 | * | |
1640 | * The VFS layer wants to change one or more of an inodes attributes. Write | |
1641 | * that change out to disk. | |
1642 | * | |
1643 | * Returns: errno | |
1644 | */ | |
1645 | ||
1646 | static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) | |
1647 | { | |
1648 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1649 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1650 | struct gfs2_holder i_gh; |
1651 | int error; | |
1652 | ||
0a305e49 BP |
1653 | error = gfs2_rs_alloc(ip); |
1654 | if (error) | |
1655 | return error; | |
1656 | ||
b3b94faa DT |
1657 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); |
1658 | if (error) | |
1659 | return error; | |
1660 | ||
1661 | error = -EPERM; | |
1662 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
1663 | goto out; | |
1664 | ||
1665 | error = inode_change_ok(inode, attr); | |
1666 | if (error) | |
1667 | goto out; | |
1668 | ||
1669 | if (attr->ia_valid & ATTR_SIZE) | |
ff8f33c8 | 1670 | error = gfs2_setattr_size(inode, attr->ia_size); |
b3b94faa DT |
1671 | else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) |
1672 | error = setattr_chown(inode, attr); | |
1673 | else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) | |
1674 | error = gfs2_acl_chmod(ip, attr); | |
1675 | else | |
ab9bbda0 | 1676 | error = gfs2_setattr_simple(inode, attr); |
b3b94faa | 1677 | |
a91ea69f | 1678 | out: |
b3b94faa DT |
1679 | if (!error) |
1680 | mark_inode_dirty(inode); | |
ab9bbda0 | 1681 | gfs2_glock_dq_uninit(&i_gh); |
b3b94faa DT |
1682 | return error; |
1683 | } | |
1684 | ||
1685 | /** | |
1686 | * gfs2_getattr - Read out an inode's attributes | |
26c1a574 | 1687 | * @mnt: The vfsmount the inode is being accessed from |
b3b94faa DT |
1688 | * @dentry: The dentry to stat |
1689 | * @stat: The inode's stats | |
1690 | * | |
dcf3dd85 SW |
1691 | * This may be called from the VFS directly, or from within GFS2 with the |
1692 | * inode locked, so we look to see if the glock is already locked and only | |
1693 | * lock the glock if its not already been done. Note that its the NFS | |
1694 | * readdirplus operation which causes this to be called (from filldir) | |
1695 | * with the glock already held. | |
1696 | * | |
b3b94faa DT |
1697 | * Returns: errno |
1698 | */ | |
1699 | ||
1700 | static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
1701 | struct kstat *stat) | |
1702 | { | |
1703 | struct inode *inode = dentry->d_inode; | |
feaa7bba | 1704 | struct gfs2_inode *ip = GFS2_I(inode); |
b3b94faa DT |
1705 | struct gfs2_holder gh; |
1706 | int error; | |
dcf3dd85 | 1707 | int unlock = 0; |
b3b94faa | 1708 | |
7afd88d9 | 1709 | if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { |
dcf3dd85 SW |
1710 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1711 | if (error) | |
1712 | return error; | |
1713 | unlock = 1; | |
b3b94faa DT |
1714 | } |
1715 | ||
dcf3dd85 | 1716 | generic_fillattr(inode, stat); |
d7c103d0 | 1717 | if (unlock) |
dcf3dd85 SW |
1718 | gfs2_glock_dq_uninit(&gh); |
1719 | ||
1720 | return 0; | |
b3b94faa DT |
1721 | } |
1722 | ||
1723 | static int gfs2_setxattr(struct dentry *dentry, const char *name, | |
1724 | const void *data, size_t size, int flags) | |
1725 | { | |
feaa7bba | 1726 | struct inode *inode = dentry->d_inode; |
40b78a32 SW |
1727 | struct gfs2_inode *ip = GFS2_I(inode); |
1728 | struct gfs2_holder gh; | |
1729 | int ret; | |
b3b94faa | 1730 | |
40b78a32 SW |
1731 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
1732 | ret = gfs2_glock_nq(&gh); | |
1733 | if (ret == 0) { | |
645b2ccc SW |
1734 | ret = gfs2_rs_alloc(ip); |
1735 | if (ret == 0) | |
1736 | ret = generic_setxattr(dentry, name, data, size, flags); | |
40b78a32 SW |
1737 | gfs2_glock_dq(&gh); |
1738 | } | |
1739 | gfs2_holder_uninit(&gh); | |
1740 | return ret; | |
b3b94faa DT |
1741 | } |
1742 | ||
1743 | static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, | |
1744 | void *data, size_t size) | |
1745 | { | |
40b78a32 SW |
1746 | struct inode *inode = dentry->d_inode; |
1747 | struct gfs2_inode *ip = GFS2_I(inode); | |
1748 | struct gfs2_holder gh; | |
1749 | int ret; | |
b3b94faa | 1750 | |
7bd9ee58 SW |
1751 | /* For selinux during lookup */ |
1752 | if (gfs2_glock_is_locked_by_me(ip->i_gl)) | |
1753 | return generic_getxattr(dentry, name, data, size); | |
1754 | ||
40b78a32 SW |
1755 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); |
1756 | ret = gfs2_glock_nq(&gh); | |
1757 | if (ret == 0) { | |
1758 | ret = generic_getxattr(dentry, name, data, size); | |
1759 | gfs2_glock_dq(&gh); | |
1760 | } | |
1761 | gfs2_holder_uninit(&gh); | |
1762 | return ret; | |
b3b94faa DT |
1763 | } |
1764 | ||
1765 | static int gfs2_removexattr(struct dentry *dentry, const char *name) | |
1766 | { | |
40b78a32 SW |
1767 | struct inode *inode = dentry->d_inode; |
1768 | struct gfs2_inode *ip = GFS2_I(inode); | |
1769 | struct gfs2_holder gh; | |
1770 | int ret; | |
b3b94faa | 1771 | |
40b78a32 SW |
1772 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
1773 | ret = gfs2_glock_nq(&gh); | |
1774 | if (ret == 0) { | |
645b2ccc SW |
1775 | ret = gfs2_rs_alloc(ip); |
1776 | if (ret == 0) | |
1777 | ret = generic_removexattr(dentry, name); | |
40b78a32 SW |
1778 | gfs2_glock_dq(&gh); |
1779 | } | |
1780 | gfs2_holder_uninit(&gh); | |
1781 | return ret; | |
b3b94faa DT |
1782 | } |
1783 | ||
e9079cce SW |
1784 | static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
1785 | u64 start, u64 len) | |
1786 | { | |
1787 | struct gfs2_inode *ip = GFS2_I(inode); | |
1788 | struct gfs2_holder gh; | |
1789 | int ret; | |
1790 | ||
1791 | ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); | |
1792 | if (ret) | |
1793 | return ret; | |
1794 | ||
1795 | mutex_lock(&inode->i_mutex); | |
1796 | ||
1797 | ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); | |
1798 | if (ret) | |
1799 | goto out; | |
1800 | ||
1801 | if (gfs2_is_stuffed(ip)) { | |
1802 | u64 phys = ip->i_no_addr << inode->i_blkbits; | |
1803 | u64 size = i_size_read(inode); | |
1804 | u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| | |
1805 | FIEMAP_EXTENT_DATA_INLINE; | |
1806 | phys += sizeof(struct gfs2_dinode); | |
1807 | phys += start; | |
1808 | if (start + len > size) | |
1809 | len = size - start; | |
1810 | if (start < size) | |
1811 | ret = fiemap_fill_next_extent(fieinfo, start, phys, | |
1812 | len, flags); | |
1813 | if (ret == 1) | |
1814 | ret = 0; | |
1815 | } else { | |
1816 | ret = __generic_block_fiemap(inode, fieinfo, start, len, | |
1817 | gfs2_block_map); | |
1818 | } | |
1819 | ||
1820 | gfs2_glock_dq_uninit(&gh); | |
1821 | out: | |
1822 | mutex_unlock(&inode->i_mutex); | |
1823 | return ret; | |
1824 | } | |
1825 | ||
92e1d5be | 1826 | const struct inode_operations gfs2_file_iops = { |
e6305c43 | 1827 | .permission = gfs2_permission, |
b3b94faa DT |
1828 | .setattr = gfs2_setattr, |
1829 | .getattr = gfs2_getattr, | |
1830 | .setxattr = gfs2_setxattr, | |
1831 | .getxattr = gfs2_getxattr, | |
1832 | .listxattr = gfs2_listxattr, | |
1833 | .removexattr = gfs2_removexattr, | |
e9079cce | 1834 | .fiemap = gfs2_fiemap, |
4e34e719 | 1835 | .get_acl = gfs2_get_acl, |
b3b94faa DT |
1836 | }; |
1837 | ||
92e1d5be | 1838 | const struct inode_operations gfs2_dir_iops = { |
b3b94faa DT |
1839 | .create = gfs2_create, |
1840 | .lookup = gfs2_lookup, | |
1841 | .link = gfs2_link, | |
1842 | .unlink = gfs2_unlink, | |
1843 | .symlink = gfs2_symlink, | |
1844 | .mkdir = gfs2_mkdir, | |
855d23ce | 1845 | .rmdir = gfs2_unlink, |
b3b94faa DT |
1846 | .mknod = gfs2_mknod, |
1847 | .rename = gfs2_rename, | |
e6305c43 | 1848 | .permission = gfs2_permission, |
b3b94faa DT |
1849 | .setattr = gfs2_setattr, |
1850 | .getattr = gfs2_getattr, | |
1851 | .setxattr = gfs2_setxattr, | |
1852 | .getxattr = gfs2_getxattr, | |
1853 | .listxattr = gfs2_listxattr, | |
1854 | .removexattr = gfs2_removexattr, | |
e9079cce | 1855 | .fiemap = gfs2_fiemap, |
4e34e719 | 1856 | .get_acl = gfs2_get_acl, |
6d4ade98 | 1857 | .atomic_open = gfs2_atomic_open, |
b3b94faa DT |
1858 | }; |
1859 | ||
92e1d5be | 1860 | const struct inode_operations gfs2_symlink_iops = { |
c177c2ac | 1861 | .readlink = generic_readlink, |
b3b94faa | 1862 | .follow_link = gfs2_follow_link, |
c177c2ac | 1863 | .put_link = gfs2_put_link, |
e6305c43 | 1864 | .permission = gfs2_permission, |
b3b94faa DT |
1865 | .setattr = gfs2_setattr, |
1866 | .getattr = gfs2_getattr, | |
1867 | .setxattr = gfs2_setxattr, | |
1868 | .getxattr = gfs2_getxattr, | |
1869 | .listxattr = gfs2_listxattr, | |
1870 | .removexattr = gfs2_removexattr, | |
e9079cce | 1871 | .fiemap = gfs2_fiemap, |
4e34e719 | 1872 | .get_acl = gfs2_get_acl, |
b3b94faa DT |
1873 | }; |
1874 |