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TOMOYO Linux Cross Reference
Linux/fs/gfs2/inode.c

Version: ~ [ linux-5.3-rc5 ] ~ [ linux-5.2.9 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.67 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.139 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.189 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.189 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.72 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  1 /*
  2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
  3  * Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
  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
  7  * of the GNU General Public License version 2.
  8  */
  9 
 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>
 15 #include <linux/mm.h>
 16 #include <linux/xattr.h>
 17 #include <linux/posix_acl.h>
 18 #include <linux/gfs2_ondisk.h>
 19 #include <linux/crc32.h>
 20 #include <linux/fiemap.h>
 21 #include <linux/security.h>
 22 #include <asm/uaccess.h>
 23 
 24 #include "gfs2.h"
 25 #include "incore.h"
 26 #include "acl.h"
 27 #include "bmap.h"
 28 #include "dir.h"
 29 #include "xattr.h"
 30 #include "glock.h"
 31 #include "inode.h"
 32 #include "meta_io.h"
 33 #include "quota.h"
 34 #include "rgrp.h"
 35 #include "trans.h"
 36 #include "util.h"
 37 #include "super.h"
 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_flags |= GL_NOCACHE;
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) {
311                 error = gfs2_permission(dir, MAY_EXEC);
312                 if (error)
313                         goto out;
314         }
315 
316         inode = gfs2_dir_search(dir, name, false);
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,
337                      umode_t mode)
338 {
339         int error;
340 
341         error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
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 
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 
357 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
358                                struct inode *inode)
359 {
360         if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
361             (dip->i_inode.i_mode & S_ISUID) &&
362             !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
363                 if (S_ISDIR(inode->i_mode))
364                         inode->i_mode |= S_ISUID;
365                 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
366                         inode->i_mode &= ~07111;
367                 inode->i_uid = dip->i_inode.i_uid;
368         } else
369                 inode->i_uid = current_fsuid();
370 
371         if (dip->i_inode.i_mode & S_ISGID) {
372                 if (S_ISDIR(inode->i_mode))
373                         inode->i_mode |= S_ISGID;
374                 inode->i_gid = dip->i_inode.i_gid;
375         } else
376                 inode->i_gid = current_fsgid();
377 }
378 
379 static int alloc_dinode(struct gfs2_inode *ip, u32 flags)
380 {
381         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
382         int error;
383         int dblocks = 1;
384 
385         error = gfs2_quota_lock_check(ip);
386         if (error)
387                 goto out;
388 
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);
394         if (error)
395                 goto out_ipreserv;
396 
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;
401 
402         gfs2_trans_end(sdp);
403 
404 out_ipreserv:
405         gfs2_inplace_release(ip);
406 out_quota:
407         gfs2_quota_unlock(ip);
408 out:
409         return error;
410 }
411 
412 static void gfs2_init_dir(struct buffer_head *dibh,
413                           const struct gfs2_inode *parent)
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 
429 /**
430  * init_dinode - Fill in a new dinode structure
431  * @dip: The directory this inode is being created in
432  * @ip: The inode
433  * @symname: The symlink destination (if a symlink)
434  * @bhp: The buffer head (returned to caller)
435  *
436  */
437 
438 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
439                         const char *symname)
440 {
441         struct gfs2_dinode *di;
442         struct buffer_head *dibh;
443 
444         dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
445         gfs2_trans_add_meta(ip->i_gl, dibh);
446         di = (struct gfs2_dinode *)dibh->b_data;
447         gfs2_dinode_out(ip, di);
448 
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));
451         di->__pad1 = 0;
452         di->__pad2 = 0;
453         di->__pad3 = 0;
454         memset(&di->__pad4, 0, sizeof(di->__pad4));
455         memset(&di->di_reserved, 0, sizeof(di->di_reserved));
456         gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
457 
458         switch(ip->i_inode.i_mode & S_IFMT) {
459         case S_IFDIR:
460                 gfs2_init_dir(dibh, dip);
461                 break;
462         case S_IFLNK:
463                 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
464                 break;
465         }
466 
467         set_buffer_uptodate(dibh);
468         brelse(dibh);
469 }
470 
471 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
472                        struct gfs2_inode *ip, int arq)
473 {
474         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
475         int error;
476 
477         if (arq) {
478                 error = gfs2_quota_lock_check(dip);
479                 if (error)
480                         goto fail_quota_locks;
481 
482                 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0);
483                 if (error)
484                         goto fail_quota_locks;
485 
486                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
487                                          dip->i_rgd->rd_length +
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 
502 fail_end_trans:
503         gfs2_trans_end(sdp);
504 fail_ipreserv:
505         gfs2_inplace_release(dip);
506 fail_quota_locks:
507         gfs2_quota_unlock(dip);
508         return error;
509 }
510 
511 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
512                     void *fs_info)
513 {
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;
523         }
524         return err;
525 }
526 
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 
534 /**
535  * gfs2_create_inode - Create a new inode
536  * @dir: The parent directory
537  * @dentry: The new dentry
538  * @file: If non-NULL, the file which is being opened
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)
543  *
544  * Returns: 0 on success, or error code
545  */
546 
547 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
548                              struct file *file,
549                              umode_t mode, dev_t dev, const char *symname,
550                              unsigned int size, int excl, int *opened)
551 {
552         const struct qstr *name = &dentry->d_name;
553         struct gfs2_holder ghs[2];
554         struct inode *inode = NULL;
555         struct gfs2_inode *dip = GFS2_I(dir), *ip;
556         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
557         struct gfs2_glock *io_gl;
558         struct dentry *d;
559         int error;
560         u32 aflags = 0;
561         int arq;
562 
563         if (!name->len || name->len > GFS2_FNAMESIZE)
564                 return -ENAMETOOLONG;
565 
566         error = gfs2_rs_alloc(dip);
567         if (error)
568                 return error;
569 
570         error = gfs2_rindex_update(sdp);
571         if (error)
572                 return error;
573 
574         error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
575         if (error)
576                 goto fail;
577 
578         error = create_ok(dip, name, mode);
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)) {
585                 d = d_splice_alias(inode, dentry);
586                 error = 0;
587                 if (file && !IS_ERR(d)) {
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                 }
595                 gfs2_glock_dq_uninit(ghs);
596                 if (IS_ERR(d))
597                         return PTR_ERR(d);
598                 return error;
599         } else if (error != -ENOENT) {
600                 goto fail_gunlock;
601         }
602 
603         arq = error = gfs2_diradd_alloc_required(dir, name);
604         if (error < 0)
605                 goto fail_gunlock;
606 
607         inode = new_inode(sdp->sd_vfs);
608         error = -ENOMEM;
609         if (!inode)
610                 goto fail_gunlock;
611 
612         ip = GFS2_I(inode);
613         error = gfs2_rs_alloc(ip);
614         if (error)
615                 goto fail_free_inode;
616 
617         inode->i_mode = mode;
618         set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
619         inode->i_rdev = dev;
620         inode->i_size = size;
621         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
622         gfs2_set_inode_blocks(inode, 1);
623         munge_mode_uid_gid(dip, inode);
624         ip->i_goal = dip->i_goal;
625         ip->i_diskflags = 0;
626         ip->i_eattr = 0;
627         ip->i_height = 0;
628         ip->i_depth = 0;
629         ip->i_entries = 0;
630 
631         switch(mode & S_IFMT) {
632         case S_IFREG:
633                 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
634                     gfs2_tune_get(sdp, gt_new_files_jdata))
635                         ip->i_diskflags |= GFS2_DIF_JDATA;
636                 gfs2_set_aops(inode);
637                 break;
638         case S_IFDIR:
639                 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
640                 ip->i_diskflags |= GFS2_DIF_JDATA;
641                 ip->i_entries = 2;
642                 break;
643         }
644         gfs2_set_inode_flags(inode);
645 
646         if ((GFS2_I(sdp->sd_root_dir->d_inode) == dip) ||
647             (dip->i_diskflags & GFS2_DIF_TOPDIR))
648                 aflags |= GFS2_AF_ORLOV;
649 
650         error = alloc_dinode(ip, aflags);
651         if (error)
652                 goto fail_free_inode;
653 
654         error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
655         if (error)
656                 goto fail_free_inode;
657 
658         ip->i_gl->gl_object = ip;
659         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
660         if (error)
661                 goto fail_free_inode;
662 
663         error = gfs2_trans_begin(sdp, RES_DINODE, 0);
664         if (error)
665                 goto fail_gunlock2;
666 
667         init_dinode(dip, ip, symname);
668         gfs2_trans_end(sdp);
669 
670         error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
671         if (error)
672                 goto fail_gunlock2;
673 
674         error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
675         if (error)
676                 goto fail_gunlock2;
677 
678         ip->i_iopen_gh.gh_gl->gl_object = ip;
679         gfs2_glock_put(io_gl);
680         gfs2_set_iop(inode);
681         insert_inode_hash(inode);
682 
683         error = gfs2_acl_create(dip, inode);
684         if (error)
685                 goto fail_gunlock3;
686 
687         error = gfs2_security_init(dip, ip, name);
688         if (error)
689                 goto fail_gunlock3;
690 
691         error = link_dinode(dip, name, ip, arq);
692         if (error)
693                 goto fail_gunlock3;
694 
695         mark_inode_dirty(inode);
696         d_instantiate(dentry, inode);
697         if (file)
698                 error = finish_open(file, dentry, gfs2_open_common, opened);
699         gfs2_glock_dq_uninit(ghs);
700         gfs2_glock_dq_uninit(ghs + 1);
701         return error;
702 
703 fail_gunlock3:
704         gfs2_glock_dq_uninit(ghs + 1);
705         if (ip->i_gl)
706                 gfs2_glock_put(ip->i_gl);
707         goto fail_gunlock;
708 
709 fail_gunlock2:
710         gfs2_glock_dq_uninit(ghs + 1);
711 fail_free_inode:
712         if (ip->i_gl)
713                 gfs2_glock_put(ip->i_gl);
714         gfs2_rs_delete(ip);
715         free_inode_nonrcu(inode);
716         inode = NULL;
717 fail_gunlock:
718         gfs2_glock_dq_uninit(ghs);
719         if (inode && !IS_ERR(inode)) {
720                 clear_nlink(inode);
721                 mark_inode_dirty(inode);
722                 set_bit(GIF_ALLOC_FAILED, &GFS2_I(inode)->i_flags);
723                 iput(inode);
724         }
725 fail:
726         return error;
727 }
728 
729 /**
730  * gfs2_create - Create a file
731  * @dir: The directory in which to create the file
732  * @dentry: The dentry of the new file
733  * @mode: The mode of the new file
734  *
735  * Returns: errno
736  */
737 
738 static int gfs2_create(struct inode *dir, struct dentry *dentry,
739                        umode_t mode, bool excl)
740 {
741         return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
742 }
743 
744 /**
745  * __gfs2_lookup - Look up a filename in a directory and return its inode
746  * @dir: The directory inode
747  * @dentry: The dentry of the new inode
748  * @file: File to be opened
749  * @opened: atomic_open flags
750  *
751  *
752  * Returns: errno
753  */
754 
755 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
756                                     struct file *file, int *opened)
757 {
758         struct inode *inode;
759         struct dentry *d;
760         struct gfs2_holder gh;
761         struct gfs2_glock *gl;
762         int error;
763 
764         inode = gfs2_lookupi(dir, &dentry->d_name, 0);
765         if (!inode)
766                 return NULL;
767         if (IS_ERR(inode))
768                 return ERR_CAST(inode);
769 
770         gl = GFS2_I(inode)->i_gl;
771         error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
772         if (error) {
773                 iput(inode);
774                 return ERR_PTR(error);
775         }
776 
777         d = d_splice_alias(inode, dentry);
778         if (file && S_ISREG(inode->i_mode))
779                 error = finish_open(file, dentry, gfs2_open_common, opened);
780 
781         gfs2_glock_dq_uninit(&gh);
782         if (error)
783                 return ERR_PTR(error);
784         return d;
785 }
786 
787 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
788                                   unsigned flags)
789 {
790         return __gfs2_lookup(dir, dentry, NULL, NULL);
791 }
792 
793 /**
794  * gfs2_link - Link to a file
795  * @old_dentry: The inode to link
796  * @dir: Add link to this directory
797  * @dentry: The name of the link
798  *
799  * Link the inode in "old_dentry" into the directory "dir" with the
800  * name in "dentry".
801  *
802  * Returns: errno
803  */
804 
805 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
806                      struct dentry *dentry)
807 {
808         struct gfs2_inode *dip = GFS2_I(dir);
809         struct gfs2_sbd *sdp = GFS2_SB(dir);
810         struct inode *inode = old_dentry->d_inode;
811         struct gfs2_inode *ip = GFS2_I(inode);
812         struct gfs2_holder ghs[2];
813         struct buffer_head *dibh;
814         int alloc_required;
815         int error;
816 
817         if (S_ISDIR(inode->i_mode))
818                 return -EPERM;
819 
820         error = gfs2_rs_alloc(dip);
821         if (error)
822                 return error;
823 
824         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
825         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
826 
827         error = gfs2_glock_nq(ghs); /* parent */
828         if (error)
829                 goto out_parent;
830 
831         error = gfs2_glock_nq(ghs + 1); /* child */
832         if (error)
833                 goto out_child;
834 
835         error = -ENOENT;
836         if (inode->i_nlink == 0)
837                 goto out_gunlock;
838 
839         error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
840         if (error)
841                 goto out_gunlock;
842 
843         error = gfs2_dir_check(dir, &dentry->d_name, NULL);
844         switch (error) {
845         case -ENOENT:
846                 break;
847         case 0:
848                 error = -EEXIST;
849         default:
850                 goto out_gunlock;
851         }
852 
853         error = -EINVAL;
854         if (!dip->i_inode.i_nlink)
855                 goto out_gunlock;
856         error = -EFBIG;
857         if (dip->i_entries == (u32)-1)
858                 goto out_gunlock;
859         error = -EPERM;
860         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
861                 goto out_gunlock;
862         error = -EINVAL;
863         if (!ip->i_inode.i_nlink)
864                 goto out_gunlock;
865         error = -EMLINK;
866         if (ip->i_inode.i_nlink == (u32)-1)
867                 goto out_gunlock;
868 
869         alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
870         if (error < 0)
871                 goto out_gunlock;
872         error = 0;
873 
874         if (alloc_required) {
875                 error = gfs2_quota_lock_check(dip);
876                 if (error)
877                         goto out_gunlock;
878 
879                 error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0);
880                 if (error)
881                         goto out_gunlock_q;
882 
883                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
884                                          gfs2_rg_blocks(dip, sdp->sd_max_dirres) +
885                                          2 * RES_DINODE + RES_STATFS +
886                                          RES_QUOTA, 0);
887                 if (error)
888                         goto out_ipres;
889         } else {
890                 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
891                 if (error)
892                         goto out_ipres;
893         }
894 
895         error = gfs2_meta_inode_buffer(ip, &dibh);
896         if (error)
897                 goto out_end_trans;
898 
899         error = gfs2_dir_add(dir, &dentry->d_name, ip);
900         if (error)
901                 goto out_brelse;
902 
903         gfs2_trans_add_meta(ip->i_gl, dibh);
904         inc_nlink(&ip->i_inode);
905         ip->i_inode.i_ctime = CURRENT_TIME;
906         ihold(inode);
907         d_instantiate(dentry, inode);
908         mark_inode_dirty(inode);
909 
910 out_brelse:
911         brelse(dibh);
912 out_end_trans:
913         gfs2_trans_end(sdp);
914 out_ipres:
915         if (alloc_required)
916                 gfs2_inplace_release(dip);
917 out_gunlock_q:
918         if (alloc_required)
919                 gfs2_quota_unlock(dip);
920 out_gunlock:
921         gfs2_glock_dq(ghs + 1);
922 out_child:
923         gfs2_glock_dq(ghs);
924 out_parent:
925         gfs2_holder_uninit(ghs);
926         gfs2_holder_uninit(ghs + 1);
927         return error;
928 }
929 
930 /*
931  * gfs2_unlink_ok - check to see that a inode is still in a directory
932  * @dip: the directory
933  * @name: the name of the file
934  * @ip: the inode
935  *
936  * Assumes that the lock on (at least) @dip is held.
937  *
938  * Returns: 0 if the parent/child relationship is correct, errno if it isn't
939  */
940 
941 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
942                           const struct gfs2_inode *ip)
943 {
944         int error;
945 
946         if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
947                 return -EPERM;
948 
949         if ((dip->i_inode.i_mode & S_ISVTX) &&
950             !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
951             !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
952                 return -EPERM;
953 
954         if (IS_APPEND(&dip->i_inode))
955                 return -EPERM;
956 
957         error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
958         if (error)
959                 return error;
960 
961         error = gfs2_dir_check(&dip->i_inode, name, ip);
962         if (error)
963                 return error;
964 
965         return 0;
966 }
967 
968 /**
969  * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
970  * @dip: The parent directory
971  * @name: The name of the entry in the parent directory
972  * @inode: The inode to be removed
973  *
974  * Called with all the locks and in a transaction. This will only be
975  * called for a directory after it has been checked to ensure it is empty.
976  *
977  * Returns: 0 on success, or an error
978  */
979 
980 static int gfs2_unlink_inode(struct gfs2_inode *dip,
981                              const struct dentry *dentry)
982 {
983         struct inode *inode = dentry->d_inode;
984         struct gfs2_inode *ip = GFS2_I(inode);
985         int error;
986 
987         error = gfs2_dir_del(dip, dentry);
988         if (error)
989                 return error;
990 
991         ip->i_entries = 0;
992         inode->i_ctime = CURRENT_TIME;
993         if (S_ISDIR(inode->i_mode))
994                 clear_nlink(inode);
995         else
996                 drop_nlink(inode);
997         mark_inode_dirty(inode);
998         if (inode->i_nlink == 0)
999                 gfs2_unlink_di(inode);
1000         return 0;
1001 }
1002 
1003 
1004 /**
1005  * gfs2_unlink - Unlink an inode (this does rmdir as well)
1006  * @dir: The inode of the directory containing the inode to unlink
1007  * @dentry: The file itself
1008  *
1009  * This routine uses the type of the inode as a flag to figure out
1010  * whether this is an unlink or an rmdir.
1011  *
1012  * Returns: errno
1013  */
1014 
1015 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1016 {
1017         struct gfs2_inode *dip = GFS2_I(dir);
1018         struct gfs2_sbd *sdp = GFS2_SB(dir);
1019         struct inode *inode = dentry->d_inode;
1020         struct gfs2_inode *ip = GFS2_I(inode);
1021         struct gfs2_holder ghs[3];
1022         struct gfs2_rgrpd *rgd;
1023         int error;
1024 
1025         error = gfs2_rindex_update(sdp);
1026         if (error)
1027                 return error;
1028 
1029         error = -EROFS;
1030 
1031         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1032         gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
1033 
1034         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1035         if (!rgd)
1036                 goto out_inodes;
1037 
1038         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1039 
1040 
1041         error = gfs2_glock_nq(ghs); /* parent */
1042         if (error)
1043                 goto out_parent;
1044 
1045         error = gfs2_glock_nq(ghs + 1); /* child */
1046         if (error)
1047                 goto out_child;
1048 
1049         error = -ENOENT;
1050         if (inode->i_nlink == 0)
1051                 goto out_rgrp;
1052 
1053         if (S_ISDIR(inode->i_mode)) {
1054                 error = -ENOTEMPTY;
1055                 if (ip->i_entries > 2 || inode->i_nlink > 2)
1056                         goto out_rgrp;
1057         }
1058 
1059         error = gfs2_glock_nq(ghs + 2); /* rgrp */
1060         if (error)
1061                 goto out_rgrp;
1062 
1063         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1064         if (error)
1065                 goto out_gunlock;
1066 
1067         error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1068         if (error)
1069                 goto out_end_trans;
1070 
1071         error = gfs2_unlink_inode(dip, dentry);
1072 
1073 out_end_trans:
1074         gfs2_trans_end(sdp);
1075 out_gunlock:
1076         gfs2_glock_dq(ghs + 2);
1077 out_rgrp:
1078         gfs2_glock_dq(ghs + 1);
1079 out_child:
1080         gfs2_glock_dq(ghs);
1081 out_parent:
1082         gfs2_holder_uninit(ghs + 2);
1083 out_inodes:
1084         gfs2_holder_uninit(ghs + 1);
1085         gfs2_holder_uninit(ghs);
1086         return error;
1087 }
1088 
1089 /**
1090  * gfs2_symlink - Create a symlink
1091  * @dir: The directory to create the symlink in
1092  * @dentry: The dentry to put the symlink in
1093  * @symname: The thing which the link points to
1094  *
1095  * Returns: errno
1096  */
1097 
1098 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1099                         const char *symname)
1100 {
1101         struct gfs2_sbd *sdp = GFS2_SB(dir);
1102         unsigned int size;
1103 
1104         size = strlen(symname);
1105         if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1106                 return -ENAMETOOLONG;
1107 
1108         return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1109 }
1110 
1111 /**
1112  * gfs2_mkdir - Make a directory
1113  * @dir: The parent directory of the new one
1114  * @dentry: The dentry of the new directory
1115  * @mode: The mode of the new directory
1116  *
1117  * Returns: errno
1118  */
1119 
1120 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1121 {
1122         struct gfs2_sbd *sdp = GFS2_SB(dir);
1123         unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1124         return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1125 }
1126 
1127 /**
1128  * gfs2_mknod - Make a special file
1129  * @dir: The directory in which the special file will reside
1130  * @dentry: The dentry of the special file
1131  * @mode: The mode of the special file
1132  * @dev: The device specification of the special file
1133  *
1134  */
1135 
1136 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1137                       dev_t dev)
1138 {
1139         return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1140 }
1141 
1142 /**
1143  * gfs2_atomic_open - Atomically open a file
1144  * @dir: The directory
1145  * @dentry: The proposed new entry
1146  * @file: The proposed new struct file
1147  * @flags: open flags
1148  * @mode: File mode
1149  * @opened: Flag to say whether the file has been opened or not
1150  *
1151  * Returns: error code or 0 for success
1152  */
1153 
1154 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1155                             struct file *file, unsigned flags,
1156                             umode_t mode, int *opened)
1157 {
1158         struct dentry *d;
1159         bool excl = !!(flags & O_EXCL);
1160 
1161         d = __gfs2_lookup(dir, dentry, file, opened);
1162         if (IS_ERR(d))
1163                 return PTR_ERR(d);
1164         if (d == NULL)
1165                 d = dentry;
1166         if (d->d_inode) {
1167                 if (!(*opened & FILE_OPENED))
1168                         return finish_no_open(file, d);
1169                 return 0;
1170         }
1171 
1172         if (!(flags & O_CREAT))
1173                 return -ENOENT;
1174 
1175         return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1176 }
1177 
1178 /*
1179  * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1180  * @this: move this
1181  * @to: to here
1182  *
1183  * Follow @to back to the root and make sure we don't encounter @this
1184  * Assumes we already hold the rename lock.
1185  *
1186  * Returns: errno
1187  */
1188 
1189 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1190 {
1191         struct inode *dir = &to->i_inode;
1192         struct super_block *sb = dir->i_sb;
1193         struct inode *tmp;
1194         int error = 0;
1195 
1196         igrab(dir);
1197 
1198         for (;;) {
1199                 if (dir == &this->i_inode) {
1200                         error = -EINVAL;
1201                         break;
1202                 }
1203                 if (dir == sb->s_root->d_inode) {
1204                         error = 0;
1205                         break;
1206                 }
1207 
1208                 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1209                 if (IS_ERR(tmp)) {
1210                         error = PTR_ERR(tmp);
1211                         break;
1212                 }
1213 
1214                 iput(dir);
1215                 dir = tmp;
1216         }
1217 
1218         iput(dir);
1219 
1220         return error;
1221 }
1222 
1223 /**
1224  * gfs2_rename - Rename a file
1225  * @odir: Parent directory of old file name
1226  * @odentry: The old dentry of the file
1227  * @ndir: Parent directory of new file name
1228  * @ndentry: The new dentry of the file
1229  *
1230  * Returns: errno
1231  */
1232 
1233 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1234                        struct inode *ndir, struct dentry *ndentry)
1235 {
1236         struct gfs2_inode *odip = GFS2_I(odir);
1237         struct gfs2_inode *ndip = GFS2_I(ndir);
1238         struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
1239         struct gfs2_inode *nip = NULL;
1240         struct gfs2_sbd *sdp = GFS2_SB(odir);
1241         struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1242         struct gfs2_rgrpd *nrgd;
1243         unsigned int num_gh;
1244         int dir_rename = 0;
1245         int alloc_required = 0;
1246         unsigned int x;
1247         int error;
1248 
1249         if (ndentry->d_inode) {
1250                 nip = GFS2_I(ndentry->d_inode);
1251                 if (ip == nip)
1252                         return 0;
1253         }
1254 
1255         error = gfs2_rindex_update(sdp);
1256         if (error)
1257                 return error;
1258 
1259         error = gfs2_rs_alloc(ndip);
1260         if (error)
1261                 return error;
1262 
1263         if (odip != ndip) {
1264                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1265                                            0, &r_gh);
1266                 if (error)
1267                         goto out;
1268 
1269                 if (S_ISDIR(ip->i_inode.i_mode)) {
1270                         dir_rename = 1;
1271                         /* don't move a dirctory into it's subdir */
1272                         error = gfs2_ok_to_move(ip, ndip);
1273                         if (error)
1274                                 goto out_gunlock_r;
1275                 }
1276         }
1277 
1278         num_gh = 1;
1279         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1280         if (odip != ndip) {
1281                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1282                 num_gh++;
1283         }
1284         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1285         num_gh++;
1286 
1287         if (nip) {
1288                 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1289                 num_gh++;
1290                 /* grab the resource lock for unlink flag twiddling 
1291                  * this is the case of the target file already existing
1292                  * so we unlink before doing the rename
1293                  */
1294                 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1295                 if (nrgd)
1296                         gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1297         }
1298 
1299         for (x = 0; x < num_gh; x++) {
1300                 error = gfs2_glock_nq(ghs + x);
1301                 if (error)
1302                         goto out_gunlock;
1303         }
1304 
1305         error = -ENOENT;
1306         if (ip->i_inode.i_nlink == 0)
1307                 goto out_gunlock;
1308 
1309         /* Check out the old directory */
1310 
1311         error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1312         if (error)
1313                 goto out_gunlock;
1314 
1315         /* Check out the new directory */
1316 
1317         if (nip) {
1318                 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1319                 if (error)
1320                         goto out_gunlock;
1321 
1322                 if (nip->i_inode.i_nlink == 0) {
1323                         error = -EAGAIN;
1324                         goto out_gunlock;
1325                 }
1326 
1327                 if (S_ISDIR(nip->i_inode.i_mode)) {
1328                         if (nip->i_entries < 2) {
1329                                 gfs2_consist_inode(nip);
1330                                 error = -EIO;
1331                                 goto out_gunlock;
1332                         }
1333                         if (nip->i_entries > 2) {
1334                                 error = -ENOTEMPTY;
1335                                 goto out_gunlock;
1336                         }
1337                 }
1338         } else {
1339                 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1340                 if (error)
1341                         goto out_gunlock;
1342 
1343                 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1344                 switch (error) {
1345                 case -ENOENT:
1346                         error = 0;
1347                         break;
1348                 case 0:
1349                         error = -EEXIST;
1350                 default:
1351                         goto out_gunlock;
1352                 };
1353 
1354                 if (odip != ndip) {
1355                         if (!ndip->i_inode.i_nlink) {
1356                                 error = -ENOENT;
1357                                 goto out_gunlock;
1358                         }
1359                         if (ndip->i_entries == (u32)-1) {
1360                                 error = -EFBIG;
1361                                 goto out_gunlock;
1362                         }
1363                         if (S_ISDIR(ip->i_inode.i_mode) &&
1364                             ndip->i_inode.i_nlink == (u32)-1) {
1365                                 error = -EMLINK;
1366                                 goto out_gunlock;
1367                         }
1368                 }
1369         }
1370 
1371         /* Check out the dir to be renamed */
1372 
1373         if (dir_rename) {
1374                 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1375                 if (error)
1376                         goto out_gunlock;
1377         }
1378 
1379         if (nip == NULL)
1380                 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
1381         error = alloc_required;
1382         if (error < 0)
1383                 goto out_gunlock;
1384 
1385         if (alloc_required) {
1386                 error = gfs2_quota_lock_check(ndip);
1387                 if (error)
1388                         goto out_gunlock;
1389 
1390                 error = gfs2_inplace_reserve(ndip, sdp->sd_max_dirres, 0);
1391                 if (error)
1392                         goto out_gunlock_q;
1393 
1394                 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
1395                                          gfs2_rg_blocks(ndip, sdp->sd_max_dirres) +
1396                                          4 * RES_DINODE + 4 * RES_LEAF +
1397                                          RES_STATFS + RES_QUOTA + 4, 0);
1398                 if (error)
1399                         goto out_ipreserv;
1400         } else {
1401                 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1402                                          5 * RES_LEAF + 4, 0);
1403                 if (error)
1404                         goto out_gunlock;
1405         }
1406 
1407         /* Remove the target file, if it exists */
1408 
1409         if (nip)
1410                 error = gfs2_unlink_inode(ndip, ndentry);
1411 
1412         if (dir_rename) {
1413                 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1414                 if (error)
1415                         goto out_end_trans;
1416         } else {
1417                 struct buffer_head *dibh;
1418                 error = gfs2_meta_inode_buffer(ip, &dibh);
1419                 if (error)
1420                         goto out_end_trans;
1421                 ip->i_inode.i_ctime = CURRENT_TIME;
1422                 gfs2_trans_add_meta(ip->i_gl, dibh);
1423                 gfs2_dinode_out(ip, dibh->b_data);
1424                 brelse(dibh);
1425         }
1426 
1427         error = gfs2_dir_del(odip, odentry);
1428         if (error)
1429                 goto out_end_trans;
1430 
1431         error = gfs2_dir_add(ndir, &ndentry->d_name, ip);
1432         if (error)
1433                 goto out_end_trans;
1434 
1435 out_end_trans:
1436         gfs2_trans_end(sdp);
1437 out_ipreserv:
1438         if (alloc_required)
1439                 gfs2_inplace_release(ndip);
1440 out_gunlock_q:
1441         if (alloc_required)
1442                 gfs2_quota_unlock(ndip);
1443 out_gunlock:
1444         while (x--) {
1445                 gfs2_glock_dq(ghs + x);
1446                 gfs2_holder_uninit(ghs + x);
1447         }
1448 out_gunlock_r:
1449         if (r_gh.gh_gl)
1450                 gfs2_glock_dq_uninit(&r_gh);
1451 out:
1452         return error;
1453 }
1454 
1455 /**
1456  * gfs2_follow_link - Follow a symbolic link
1457  * @dentry: The dentry of the link
1458  * @nd: Data that we pass to vfs_follow_link()
1459  *
1460  * This can handle symlinks of any size.
1461  *
1462  * Returns: 0 on success or error code
1463  */
1464 
1465 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1466 {
1467         struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1468         struct gfs2_holder i_gh;
1469         struct buffer_head *dibh;
1470         unsigned int size;
1471         char *buf;
1472         int error;
1473 
1474         gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1475         error = gfs2_glock_nq(&i_gh);
1476         if (error) {
1477                 gfs2_holder_uninit(&i_gh);
1478                 nd_set_link(nd, ERR_PTR(error));
1479                 return NULL;
1480         }
1481 
1482         size = (unsigned int)i_size_read(&ip->i_inode);
1483         if (size == 0) {
1484                 gfs2_consist_inode(ip);
1485                 buf = ERR_PTR(-EIO);
1486                 goto out;
1487         }
1488 
1489         error = gfs2_meta_inode_buffer(ip, &dibh);
1490         if (error) {
1491                 buf = ERR_PTR(error);
1492                 goto out;
1493         }
1494 
1495         buf = kzalloc(size + 1, GFP_NOFS);
1496         if (!buf)
1497                 buf = ERR_PTR(-ENOMEM);
1498         else
1499                 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1500         brelse(dibh);
1501 out:
1502         gfs2_glock_dq_uninit(&i_gh);
1503         nd_set_link(nd, buf);
1504         return NULL;
1505 }
1506 
1507 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1508 {
1509         char *s = nd_get_link(nd);
1510         if (!IS_ERR(s))
1511                 kfree(s);
1512 }
1513 
1514 /**
1515  * gfs2_permission -
1516  * @inode: The inode
1517  * @mask: The mask to be tested
1518  * @flags: Indicates whether this is an RCU path walk or not
1519  *
1520  * This may be called from the VFS directly, or from within GFS2 with the
1521  * inode locked, so we look to see if the glock is already locked and only
1522  * lock the glock if its not already been done.
1523  *
1524  * Returns: errno
1525  */
1526 
1527 int gfs2_permission(struct inode *inode, int mask)
1528 {
1529         struct gfs2_inode *ip;
1530         struct gfs2_holder i_gh;
1531         int error;
1532         int unlock = 0;
1533 
1534 
1535         ip = GFS2_I(inode);
1536         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1537                 if (mask & MAY_NOT_BLOCK)
1538                         return -ECHILD;
1539                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1540                 if (error)
1541                         return error;
1542                 unlock = 1;
1543         }
1544 
1545         if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1546                 error = -EACCES;
1547         else
1548                 error = generic_permission(inode, mask);
1549         if (unlock)
1550                 gfs2_glock_dq_uninit(&i_gh);
1551 
1552         return error;
1553 }
1554 
1555 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1556 {
1557         setattr_copy(inode, attr);
1558         mark_inode_dirty(inode);
1559         return 0;
1560 }
1561 
1562 /**
1563  * gfs2_setattr_simple -
1564  * @ip:
1565  * @attr:
1566  *
1567  * Returns: errno
1568  */
1569 
1570 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1571 {
1572         int error;
1573 
1574         if (current->journal_info)
1575                 return __gfs2_setattr_simple(inode, attr);
1576 
1577         error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1578         if (error)
1579                 return error;
1580 
1581         error = __gfs2_setattr_simple(inode, attr);
1582         gfs2_trans_end(GFS2_SB(inode));
1583         return error;
1584 }
1585 
1586 static int setattr_chown(struct inode *inode, struct iattr *attr)
1587 {
1588         struct gfs2_inode *ip = GFS2_I(inode);
1589         struct gfs2_sbd *sdp = GFS2_SB(inode);
1590         kuid_t ouid, nuid;
1591         kgid_t ogid, ngid;
1592         int error;
1593 
1594         ouid = inode->i_uid;
1595         ogid = inode->i_gid;
1596         nuid = attr->ia_uid;
1597         ngid = attr->ia_gid;
1598 
1599         if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1600                 ouid = nuid = NO_UID_QUOTA_CHANGE;
1601         if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1602                 ogid = ngid = NO_GID_QUOTA_CHANGE;
1603 
1604         error = gfs2_quota_lock(ip, nuid, ngid);
1605         if (error)
1606                 return error;
1607 
1608         if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1609             !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1610                 error = gfs2_quota_check(ip, nuid, ngid);
1611                 if (error)
1612                         goto out_gunlock_q;
1613         }
1614 
1615         error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1616         if (error)
1617                 goto out_gunlock_q;
1618 
1619         error = gfs2_setattr_simple(inode, attr);
1620         if (error)
1621                 goto out_end_trans;
1622 
1623         if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1624             !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1625                 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1626                 gfs2_quota_change(ip, -blocks, ouid, ogid);
1627                 gfs2_quota_change(ip, blocks, nuid, ngid);
1628         }
1629 
1630 out_end_trans:
1631         gfs2_trans_end(sdp);
1632 out_gunlock_q:
1633         gfs2_quota_unlock(ip);
1634         return error;
1635 }
1636 
1637 /**
1638  * gfs2_setattr - Change attributes on an inode
1639  * @dentry: The dentry which is changing
1640  * @attr: The structure describing the change
1641  *
1642  * The VFS layer wants to change one or more of an inodes attributes.  Write
1643  * that change out to disk.
1644  *
1645  * Returns: errno
1646  */
1647 
1648 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1649 {
1650         struct inode *inode = dentry->d_inode;
1651         struct gfs2_inode *ip = GFS2_I(inode);
1652         struct gfs2_holder i_gh;
1653         int error;
1654 
1655         error = gfs2_rs_alloc(ip);
1656         if (error)
1657                 return error;
1658 
1659         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1660         if (error)
1661                 return error;
1662 
1663         error = -EPERM;
1664         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1665                 goto out;
1666 
1667         error = inode_change_ok(inode, attr);
1668         if (error)
1669                 goto out;
1670 
1671         if (attr->ia_valid & ATTR_SIZE)
1672                 error = gfs2_setattr_size(inode, attr->ia_size);
1673         else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1674                 error = setattr_chown(inode, attr);
1675         else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1676                 error = gfs2_acl_chmod(ip, attr);
1677         else
1678                 error = gfs2_setattr_simple(inode, attr);
1679 
1680 out:
1681         if (!error)
1682                 mark_inode_dirty(inode);
1683         gfs2_glock_dq_uninit(&i_gh);
1684         return error;
1685 }
1686 
1687 /**
1688  * gfs2_getattr - Read out an inode's attributes
1689  * @mnt: The vfsmount the inode is being accessed from
1690  * @dentry: The dentry to stat
1691  * @stat: The inode's stats
1692  *
1693  * This may be called from the VFS directly, or from within GFS2 with the
1694  * inode locked, so we look to see if the glock is already locked and only
1695  * lock the glock if its not already been done. Note that its the NFS
1696  * readdirplus operation which causes this to be called (from filldir)
1697  * with the glock already held.
1698  *
1699  * Returns: errno
1700  */
1701 
1702 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1703                         struct kstat *stat)
1704 {
1705         struct inode *inode = dentry->d_inode;
1706         struct gfs2_inode *ip = GFS2_I(inode);
1707         struct gfs2_holder gh;
1708         int error;
1709         int unlock = 0;
1710 
1711         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1712                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1713                 if (error)
1714                         return error;
1715                 unlock = 1;
1716         }
1717 
1718         generic_fillattr(inode, stat);
1719         if (unlock)
1720                 gfs2_glock_dq_uninit(&gh);
1721 
1722         return 0;
1723 }
1724 
1725 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1726                          const void *data, size_t size, int flags)
1727 {
1728         struct inode *inode = dentry->d_inode;
1729         struct gfs2_inode *ip = GFS2_I(inode);
1730         struct gfs2_holder gh;
1731         int ret;
1732 
1733         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1734         ret = gfs2_glock_nq(&gh);
1735         if (ret == 0) {
1736                 ret = gfs2_rs_alloc(ip);
1737                 if (ret == 0)
1738                         ret = generic_setxattr(dentry, name, data, size, flags);
1739                 gfs2_glock_dq(&gh);
1740         }
1741         gfs2_holder_uninit(&gh);
1742         return ret;
1743 }
1744 
1745 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1746                              void *data, size_t size)
1747 {
1748         struct inode *inode = dentry->d_inode;
1749         struct gfs2_inode *ip = GFS2_I(inode);
1750         struct gfs2_holder gh;
1751         int ret;
1752 
1753         /* For selinux during lookup */
1754         if (gfs2_glock_is_locked_by_me(ip->i_gl))
1755                 return generic_getxattr(dentry, name, data, size);
1756 
1757         gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1758         ret = gfs2_glock_nq(&gh);
1759         if (ret == 0) {
1760                 ret = generic_getxattr(dentry, name, data, size);
1761                 gfs2_glock_dq(&gh);
1762         }
1763         gfs2_holder_uninit(&gh);
1764         return ret;
1765 }
1766 
1767 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1768 {
1769         struct inode *inode = dentry->d_inode;
1770         struct gfs2_inode *ip = GFS2_I(inode);
1771         struct gfs2_holder gh;
1772         int ret;
1773 
1774         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1775         ret = gfs2_glock_nq(&gh);
1776         if (ret == 0) {
1777                 ret = gfs2_rs_alloc(ip);
1778                 if (ret == 0)
1779                         ret = generic_removexattr(dentry, name);
1780                 gfs2_glock_dq(&gh);
1781         }
1782         gfs2_holder_uninit(&gh);
1783         return ret;
1784 }
1785 
1786 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1787                        u64 start, u64 len)
1788 {
1789         struct gfs2_inode *ip = GFS2_I(inode);
1790         struct gfs2_holder gh;
1791         int ret;
1792 
1793         ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1794         if (ret)
1795                 return ret;
1796 
1797         mutex_lock(&inode->i_mutex);
1798 
1799         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1800         if (ret)
1801                 goto out;
1802 
1803         if (gfs2_is_stuffed(ip)) {
1804                 u64 phys = ip->i_no_addr << inode->i_blkbits;
1805                 u64 size = i_size_read(inode);
1806                 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1807                             FIEMAP_EXTENT_DATA_INLINE;
1808                 phys += sizeof(struct gfs2_dinode);
1809                 phys += start;
1810                 if (start + len > size)
1811                         len = size - start;
1812                 if (start < size)
1813                         ret = fiemap_fill_next_extent(fieinfo, start, phys,
1814                                                       len, flags);
1815                 if (ret == 1)
1816                         ret = 0;
1817         } else {
1818                 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1819                                              gfs2_block_map);
1820         }
1821 
1822         gfs2_glock_dq_uninit(&gh);
1823 out:
1824         mutex_unlock(&inode->i_mutex);
1825         return ret;
1826 }
1827 
1828 const struct inode_operations gfs2_file_iops = {
1829         .permission = gfs2_permission,
1830         .setattr = gfs2_setattr,
1831         .getattr = gfs2_getattr,
1832         .setxattr = gfs2_setxattr,
1833         .getxattr = gfs2_getxattr,
1834         .listxattr = gfs2_listxattr,
1835         .removexattr = gfs2_removexattr,
1836         .fiemap = gfs2_fiemap,
1837         .get_acl = gfs2_get_acl,
1838 };
1839 
1840 const struct inode_operations gfs2_dir_iops = {
1841         .create = gfs2_create,
1842         .lookup = gfs2_lookup,
1843         .link = gfs2_link,
1844         .unlink = gfs2_unlink,
1845         .symlink = gfs2_symlink,
1846         .mkdir = gfs2_mkdir,
1847         .rmdir = gfs2_unlink,
1848         .mknod = gfs2_mknod,
1849         .rename = gfs2_rename,
1850         .permission = gfs2_permission,
1851         .setattr = gfs2_setattr,
1852         .getattr = gfs2_getattr,
1853         .setxattr = gfs2_setxattr,
1854         .getxattr = gfs2_getxattr,
1855         .listxattr = gfs2_listxattr,
1856         .removexattr = gfs2_removexattr,
1857         .fiemap = gfs2_fiemap,
1858         .get_acl = gfs2_get_acl,
1859         .atomic_open = gfs2_atomic_open,
1860 };
1861 
1862 const struct inode_operations gfs2_symlink_iops = {
1863         .readlink = generic_readlink,
1864         .follow_link = gfs2_follow_link,
1865         .put_link = gfs2_put_link,
1866         .permission = gfs2_permission,
1867         .setattr = gfs2_setattr,
1868         .getattr = gfs2_getattr,
1869         .setxattr = gfs2_setxattr,
1870         .getxattr = gfs2_getxattr,
1871         .listxattr = gfs2_listxattr,
1872         .removexattr = gfs2_removexattr,
1873         .fiemap = gfs2_fiemap,
1874         .get_acl = gfs2_get_acl,
1875 };
1876 
1877 

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