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

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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/cred.h>
 17 #include <linux/xattr.h>
 18 #include <linux/posix_acl.h>
 19 #include <linux/gfs2_ondisk.h>
 20 #include <linux/crc32.h>
 21 #include <linux/iomap.h>
 22 #include <linux/security.h>
 23 #include <linux/uaccess.h>
 24 
 25 #include "gfs2.h"
 26 #include "incore.h"
 27 #include "acl.h"
 28 #include "bmap.h"
 29 #include "dir.h"
 30 #include "xattr.h"
 31 #include "glock.h"
 32 #include "inode.h"
 33 #include "meta_io.h"
 34 #include "quota.h"
 35 #include "rgrp.h"
 36 #include "trans.h"
 37 #include "util.h"
 38 #include "super.h"
 39 #include "glops.h"
 40 
 41 static int iget_test(struct inode *inode, void *opaque)
 42 {
 43         u64 no_addr = *(u64 *)opaque;
 44 
 45         return GFS2_I(inode)->i_no_addr == no_addr;
 46 }
 47 
 48 static int iget_set(struct inode *inode, void *opaque)
 49 {
 50         u64 no_addr = *(u64 *)opaque;
 51 
 52         GFS2_I(inode)->i_no_addr = no_addr;
 53         inode->i_ino = no_addr;
 54         return 0;
 55 }
 56 
 57 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
 58 {
 59         struct inode *inode;
 60 
 61 repeat:
 62         inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
 63         if (!inode)
 64                 return inode;
 65         if (is_bad_inode(inode)) {
 66                 iput(inode);
 67                 goto repeat;
 68         }
 69         return inode;
 70 }
 71 
 72 /**
 73  * gfs2_set_iop - Sets inode operations
 74  * @inode: The inode with correct i_mode filled in
 75  *
 76  * GFS2 lookup code fills in vfs inode contents based on info obtained
 77  * from directory entry inside gfs2_inode_lookup().
 78  */
 79 
 80 static void gfs2_set_iop(struct inode *inode)
 81 {
 82         struct gfs2_sbd *sdp = GFS2_SB(inode);
 83         umode_t mode = inode->i_mode;
 84 
 85         if (S_ISREG(mode)) {
 86                 inode->i_op = &gfs2_file_iops;
 87                 if (gfs2_localflocks(sdp))
 88                         inode->i_fop = &gfs2_file_fops_nolock;
 89                 else
 90                         inode->i_fop = &gfs2_file_fops;
 91         } else if (S_ISDIR(mode)) {
 92                 inode->i_op = &gfs2_dir_iops;
 93                 if (gfs2_localflocks(sdp))
 94                         inode->i_fop = &gfs2_dir_fops_nolock;
 95                 else
 96                         inode->i_fop = &gfs2_dir_fops;
 97         } else if (S_ISLNK(mode)) {
 98                 inode->i_op = &gfs2_symlink_iops;
 99         } else {
100                 inode->i_op = &gfs2_file_iops;
101                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
102         }
103 }
104 
105 /**
106  * gfs2_inode_lookup - Lookup an inode
107  * @sb: The super block
108  * @type: The type of the inode
109  * @no_addr: The inode number
110  * @no_formal_ino: The inode generation number
111  * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
112  *           GFS2_BLKST_FREE to indicate not to verify)
113  *
114  * If @type is DT_UNKNOWN, the inode type is fetched from disk.
115  *
116  * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
117  * placeholder because it doesn't otherwise make sense), the on-disk block type
118  * is verified to be @blktype.
119  *
120  * Returns: A VFS inode, or an error
121  */
122 
123 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
124                                 u64 no_addr, u64 no_formal_ino,
125                                 unsigned int blktype)
126 {
127         struct inode *inode;
128         struct gfs2_inode *ip;
129         struct gfs2_glock *io_gl = NULL;
130         struct gfs2_holder i_gh;
131         int error;
132 
133         gfs2_holder_mark_uninitialized(&i_gh);
134         inode = gfs2_iget(sb, no_addr);
135         if (!inode)
136                 return ERR_PTR(-ENOMEM);
137 
138         ip = GFS2_I(inode);
139 
140         if (inode->i_state & I_NEW) {
141                 struct gfs2_sbd *sdp = GFS2_SB(inode);
142                 ip->i_no_formal_ino = no_formal_ino;
143 
144                 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
145                 if (unlikely(error))
146                         goto fail;
147                 flush_delayed_work(&ip->i_gl->gl_work);
148 
149                 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
150                 if (unlikely(error))
151                         goto fail_put;
152 
153                 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
154                         /*
155                          * The GL_SKIP flag indicates to skip reading the inode
156                          * block.  We read the inode with gfs2_inode_refresh
157                          * after possibly checking the block type.
158                          */
159                         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
160                                                    GL_SKIP, &i_gh);
161                         if (error)
162                                 goto fail_put;
163 
164                         if (blktype != GFS2_BLKST_FREE) {
165                                 error = gfs2_check_blk_type(sdp, no_addr,
166                                                             blktype);
167                                 if (error)
168                                         goto fail_put;
169                         }
170                 }
171 
172                 glock_set_object(ip->i_gl, ip);
173                 set_bit(GIF_INVALID, &ip->i_flags);
174                 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
175                 if (unlikely(error))
176                         goto fail_put;
177                 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
178                 gfs2_glock_put(io_gl);
179                 io_gl = NULL;
180 
181                 if (type == DT_UNKNOWN) {
182                         /* Inode glock must be locked already */
183                         error = gfs2_inode_refresh(GFS2_I(inode));
184                         if (error)
185                                 goto fail_refresh;
186                 } else {
187                         inode->i_mode = DT2IF(type);
188                 }
189 
190                 gfs2_set_iop(inode);
191 
192                 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
193                 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
194                 inode->i_atime.tv_nsec = 0;
195 
196                 unlock_new_inode(inode);
197         }
198 
199         if (gfs2_holder_initialized(&i_gh))
200                 gfs2_glock_dq_uninit(&i_gh);
201         return inode;
202 
203 fail_refresh:
204         ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
205         glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
206         gfs2_glock_dq_uninit(&ip->i_iopen_gh);
207 fail_put:
208         if (io_gl)
209                 gfs2_glock_put(io_gl);
210         glock_clear_object(ip->i_gl, ip);
211         if (gfs2_holder_initialized(&i_gh))
212                 gfs2_glock_dq_uninit(&i_gh);
213 fail:
214         iget_failed(inode);
215         return ERR_PTR(error);
216 }
217 
218 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
219                                   u64 *no_formal_ino, unsigned int blktype)
220 {
221         struct super_block *sb = sdp->sd_vfs;
222         struct inode *inode;
223         int error;
224 
225         inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, blktype);
226         if (IS_ERR(inode))
227                 return inode;
228 
229         /* Two extra checks for NFS only */
230         if (no_formal_ino) {
231                 error = -ESTALE;
232                 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
233                         goto fail_iput;
234 
235                 error = -EIO;
236                 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
237                         goto fail_iput;
238         }
239         return inode;
240 
241 fail_iput:
242         iput(inode);
243         return ERR_PTR(error);
244 }
245 
246 
247 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
248 {
249         struct qstr qstr;
250         struct inode *inode;
251         gfs2_str2qstr(&qstr, name);
252         inode = gfs2_lookupi(dip, &qstr, 1);
253         /* gfs2_lookupi has inconsistent callers: vfs
254          * related routines expect NULL for no entry found,
255          * gfs2_lookup_simple callers expect ENOENT
256          * and do not check for NULL.
257          */
258         if (inode == NULL)
259                 return ERR_PTR(-ENOENT);
260         else
261                 return inode;
262 }
263 
264 
265 /**
266  * gfs2_lookupi - Look up a filename in a directory and return its inode
267  * @d_gh: An initialized holder for the directory glock
268  * @name: The name of the inode to look for
269  * @is_root: If 1, ignore the caller's permissions
270  * @i_gh: An uninitialized holder for the new inode glock
271  *
272  * This can be called via the VFS filldir function when NFS is doing
273  * a readdirplus and the inode which its intending to stat isn't
274  * already in cache. In this case we must not take the directory glock
275  * again, since the readdir call will have already taken that lock.
276  *
277  * Returns: errno
278  */
279 
280 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
281                            int is_root)
282 {
283         struct super_block *sb = dir->i_sb;
284         struct gfs2_inode *dip = GFS2_I(dir);
285         struct gfs2_holder d_gh;
286         int error = 0;
287         struct inode *inode = NULL;
288 
289         gfs2_holder_mark_uninitialized(&d_gh);
290         if (!name->len || name->len > GFS2_FNAMESIZE)
291                 return ERR_PTR(-ENAMETOOLONG);
292 
293         if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
294             (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
295              dir == d_inode(sb->s_root))) {
296                 igrab(dir);
297                 return dir;
298         }
299 
300         if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
301                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
302                 if (error)
303                         return ERR_PTR(error);
304         }
305 
306         if (!is_root) {
307                 error = gfs2_permission(dir, MAY_EXEC);
308                 if (error)
309                         goto out;
310         }
311 
312         inode = gfs2_dir_search(dir, name, false);
313         if (IS_ERR(inode))
314                 error = PTR_ERR(inode);
315 out:
316         if (gfs2_holder_initialized(&d_gh))
317                 gfs2_glock_dq_uninit(&d_gh);
318         if (error == -ENOENT)
319                 return NULL;
320         return inode ? inode : ERR_PTR(error);
321 }
322 
323 /**
324  * create_ok - OK to create a new on-disk inode here?
325  * @dip:  Directory in which dinode is to be created
326  * @name:  Name of new dinode
327  * @mode:
328  *
329  * Returns: errno
330  */
331 
332 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
333                      umode_t mode)
334 {
335         int error;
336 
337         error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
338         if (error)
339                 return error;
340 
341         /*  Don't create entries in an unlinked directory  */
342         if (!dip->i_inode.i_nlink)
343                 return -ENOENT;
344 
345         if (dip->i_entries == (u32)-1)
346                 return -EFBIG;
347         if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
348                 return -EMLINK;
349 
350         return 0;
351 }
352 
353 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
354                                struct inode *inode)
355 {
356         if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
357             (dip->i_inode.i_mode & S_ISUID) &&
358             !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
359                 if (S_ISDIR(inode->i_mode))
360                         inode->i_mode |= S_ISUID;
361                 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
362                         inode->i_mode &= ~07111;
363                 inode->i_uid = dip->i_inode.i_uid;
364         } else
365                 inode->i_uid = current_fsuid();
366 
367         if (dip->i_inode.i_mode & S_ISGID) {
368                 if (S_ISDIR(inode->i_mode))
369                         inode->i_mode |= S_ISGID;
370                 inode->i_gid = dip->i_inode.i_gid;
371         } else
372                 inode->i_gid = current_fsgid();
373 }
374 
375 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
376 {
377         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
378         struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
379         int error;
380 
381         error = gfs2_quota_lock_check(ip, &ap);
382         if (error)
383                 goto out;
384 
385         error = gfs2_inplace_reserve(ip, &ap);
386         if (error)
387                 goto out_quota;
388 
389         error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
390         if (error)
391                 goto out_ipreserv;
392 
393         error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
394         ip->i_no_formal_ino = ip->i_generation;
395         ip->i_inode.i_ino = ip->i_no_addr;
396         ip->i_goal = ip->i_no_addr;
397 
398         gfs2_trans_end(sdp);
399 
400 out_ipreserv:
401         gfs2_inplace_release(ip);
402 out_quota:
403         gfs2_quota_unlock(ip);
404 out:
405         return error;
406 }
407 
408 static void gfs2_init_dir(struct buffer_head *dibh,
409                           const struct gfs2_inode *parent)
410 {
411         struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
412         struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
413 
414         gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
415         dent->de_inum = di->di_num; /* already GFS2 endian */
416         dent->de_type = cpu_to_be16(DT_DIR);
417 
418         dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
419         gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
420         gfs2_inum_out(parent, dent);
421         dent->de_type = cpu_to_be16(DT_DIR);
422         
423 }
424 
425 /**
426  * gfs2_init_xattr - Initialise an xattr block for a new inode
427  * @ip: The inode in question
428  *
429  * This sets up an empty xattr block for a new inode, ready to
430  * take any ACLs, LSM xattrs, etc.
431  */
432 
433 static void gfs2_init_xattr(struct gfs2_inode *ip)
434 {
435         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
436         struct buffer_head *bh;
437         struct gfs2_ea_header *ea;
438 
439         bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
440         gfs2_trans_add_meta(ip->i_gl, bh);
441         gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
442         gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
443 
444         ea = GFS2_EA_BH2FIRST(bh);
445         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
446         ea->ea_type = GFS2_EATYPE_UNUSED;
447         ea->ea_flags = GFS2_EAFLAG_LAST;
448 
449         brelse(bh);
450 }
451 
452 /**
453  * init_dinode - Fill in a new dinode structure
454  * @dip: The directory this inode is being created in
455  * @ip: The inode
456  * @symname: The symlink destination (if a symlink)
457  * @bhp: The buffer head (returned to caller)
458  *
459  */
460 
461 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
462                         const char *symname)
463 {
464         struct gfs2_dinode *di;
465         struct buffer_head *dibh;
466 
467         dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
468         gfs2_trans_add_meta(ip->i_gl, dibh);
469         di = (struct gfs2_dinode *)dibh->b_data;
470         gfs2_dinode_out(ip, di);
471 
472         di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
473         di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
474         di->__pad1 = 0;
475         di->__pad2 = 0;
476         di->__pad3 = 0;
477         memset(&di->__pad4, 0, sizeof(di->__pad4));
478         memset(&di->di_reserved, 0, sizeof(di->di_reserved));
479         gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
480 
481         switch(ip->i_inode.i_mode & S_IFMT) {
482         case S_IFDIR:
483                 gfs2_init_dir(dibh, dip);
484                 break;
485         case S_IFLNK:
486                 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
487                 break;
488         }
489 
490         set_buffer_uptodate(dibh);
491         brelse(dibh);
492 }
493 
494 /**
495  * gfs2_trans_da_blocks - Calculate number of blocks to link inode
496  * @dip: The directory we are linking into
497  * @da: The dir add information
498  * @nr_inodes: The number of inodes involved
499  *
500  * This calculate the number of blocks we need to reserve in a
501  * transaction to link @nr_inodes into a directory. In most cases
502  * @nr_inodes will be 2 (the directory plus the inode being linked in)
503  * but in case of rename, 4 may be required.
504  *
505  * Returns: Number of blocks
506  */
507 
508 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
509                                    const struct gfs2_diradd *da,
510                                    unsigned nr_inodes)
511 {
512         return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
513                (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
514 }
515 
516 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
517                        struct gfs2_inode *ip, struct gfs2_diradd *da)
518 {
519         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
520         struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
521         int error;
522 
523         if (da->nr_blocks) {
524                 error = gfs2_quota_lock_check(dip, &ap);
525                 if (error)
526                         goto fail_quota_locks;
527 
528                 error = gfs2_inplace_reserve(dip, &ap);
529                 if (error)
530                         goto fail_quota_locks;
531 
532                 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
533                 if (error)
534                         goto fail_ipreserv;
535         } else {
536                 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
537                 if (error)
538                         goto fail_quota_locks;
539         }
540 
541         error = gfs2_dir_add(&dip->i_inode, name, ip, da);
542 
543         gfs2_trans_end(sdp);
544 fail_ipreserv:
545         gfs2_inplace_release(dip);
546 fail_quota_locks:
547         gfs2_quota_unlock(dip);
548         return error;
549 }
550 
551 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
552                     void *fs_info)
553 {
554         const struct xattr *xattr;
555         int err = 0;
556 
557         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
558                 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
559                                        xattr->value_len, 0,
560                                        GFS2_EATYPE_SECURITY);
561                 if (err < 0)
562                         break;
563         }
564         return err;
565 }
566 
567 /**
568  * gfs2_create_inode - Create a new inode
569  * @dir: The parent directory
570  * @dentry: The new dentry
571  * @file: If non-NULL, the file which is being opened
572  * @mode: The permissions on the new inode
573  * @dev: For device nodes, this is the device number
574  * @symname: For symlinks, this is the link destination
575  * @size: The initial size of the inode (ignored for directories)
576  *
577  * Returns: 0 on success, or error code
578  */
579 
580 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
581                              struct file *file,
582                              umode_t mode, dev_t dev, const char *symname,
583                              unsigned int size, int excl)
584 {
585         const struct qstr *name = &dentry->d_name;
586         struct posix_acl *default_acl, *acl;
587         struct gfs2_holder ghs[2];
588         struct inode *inode = NULL;
589         struct gfs2_inode *dip = GFS2_I(dir), *ip;
590         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
591         struct gfs2_glock *io_gl = NULL;
592         int error, free_vfs_inode = 1;
593         u32 aflags = 0;
594         unsigned blocks = 1;
595         struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
596 
597         if (!name->len || name->len > GFS2_FNAMESIZE)
598                 return -ENAMETOOLONG;
599 
600         error = gfs2_rsqa_alloc(dip);
601         if (error)
602                 return error;
603 
604         error = gfs2_rindex_update(sdp);
605         if (error)
606                 return error;
607 
608         error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
609         if (error)
610                 goto fail;
611         gfs2_holder_mark_uninitialized(ghs + 1);
612 
613         error = create_ok(dip, name, mode);
614         if (error)
615                 goto fail_gunlock;
616 
617         inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
618         error = PTR_ERR(inode);
619         if (!IS_ERR(inode)) {
620                 if (S_ISDIR(inode->i_mode)) {
621                         iput(inode);
622                         inode = ERR_PTR(-EISDIR);
623                         goto fail_gunlock;
624                 }
625                 d_instantiate(dentry, inode);
626                 error = 0;
627                 if (file) {
628                         if (S_ISREG(inode->i_mode))
629                                 error = finish_open(file, dentry, gfs2_open_common);
630                         else
631                                 error = finish_no_open(file, NULL);
632                 }
633                 gfs2_glock_dq_uninit(ghs);
634                 return error;
635         } else if (error != -ENOENT) {
636                 goto fail_gunlock;
637         }
638 
639         error = gfs2_diradd_alloc_required(dir, name, &da);
640         if (error < 0)
641                 goto fail_gunlock;
642 
643         inode = new_inode(sdp->sd_vfs);
644         error = -ENOMEM;
645         if (!inode)
646                 goto fail_gunlock;
647 
648         error = posix_acl_create(dir, &mode, &default_acl, &acl);
649         if (error)
650                 goto fail_gunlock;
651 
652         ip = GFS2_I(inode);
653         error = gfs2_rsqa_alloc(ip);
654         if (error)
655                 goto fail_free_acls;
656 
657         inode->i_mode = mode;
658         set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
659         inode->i_rdev = dev;
660         inode->i_size = size;
661         inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
662         gfs2_set_inode_blocks(inode, 1);
663         munge_mode_uid_gid(dip, inode);
664         check_and_update_goal(dip);
665         ip->i_goal = dip->i_goal;
666         ip->i_diskflags = 0;
667         ip->i_eattr = 0;
668         ip->i_height = 0;
669         ip->i_depth = 0;
670         ip->i_entries = 0;
671         ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
672 
673         switch(mode & S_IFMT) {
674         case S_IFREG:
675                 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
676                     gfs2_tune_get(sdp, gt_new_files_jdata))
677                         ip->i_diskflags |= GFS2_DIF_JDATA;
678                 gfs2_set_aops(inode);
679                 break;
680         case S_IFDIR:
681                 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
682                 ip->i_diskflags |= GFS2_DIF_JDATA;
683                 ip->i_entries = 2;
684                 break;
685         }
686 
687         /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
688         if (dip->i_diskflags & GFS2_DIF_SYSTEM)
689                 ip->i_diskflags |= GFS2_DIF_SYSTEM;
690 
691         gfs2_set_inode_flags(inode);
692 
693         if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
694             (dip->i_diskflags & GFS2_DIF_TOPDIR))
695                 aflags |= GFS2_AF_ORLOV;
696 
697         if (default_acl || acl)
698                 blocks++;
699 
700         error = alloc_dinode(ip, aflags, &blocks);
701         if (error)
702                 goto fail_free_inode;
703 
704         gfs2_set_inode_blocks(inode, blocks);
705 
706         error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
707         if (error)
708                 goto fail_free_inode;
709         flush_delayed_work(&ip->i_gl->gl_work);
710         glock_set_object(ip->i_gl, ip);
711 
712         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
713         if (error)
714                 goto fail_free_inode;
715 
716         error = gfs2_trans_begin(sdp, blocks, 0);
717         if (error)
718                 goto fail_gunlock2;
719 
720         if (blocks > 1) {
721                 ip->i_eattr = ip->i_no_addr + 1;
722                 gfs2_init_xattr(ip);
723         }
724         init_dinode(dip, ip, symname);
725         gfs2_trans_end(sdp);
726 
727         error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
728         if (error)
729                 goto fail_gunlock2;
730 
731         BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
732 
733         error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
734         if (error)
735                 goto fail_gunlock2;
736 
737         glock_set_object(ip->i_iopen_gh.gh_gl, ip);
738         gfs2_glock_put(io_gl);
739         gfs2_set_iop(inode);
740         insert_inode_hash(inode);
741 
742         free_vfs_inode = 0; /* After this point, the inode is no longer
743                                considered free. Any failures need to undo
744                                the gfs2 structures. */
745         if (default_acl) {
746                 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
747                 if (error)
748                         goto fail_gunlock3;
749                 posix_acl_release(default_acl);
750                 default_acl = NULL;
751         }
752         if (acl) {
753                 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
754                 if (error)
755                         goto fail_gunlock3;
756                 posix_acl_release(acl);
757                 acl = NULL;
758         }
759 
760         error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
761                                              &gfs2_initxattrs, NULL);
762         if (error)
763                 goto fail_gunlock3;
764 
765         error = link_dinode(dip, name, ip, &da);
766         if (error)
767                 goto fail_gunlock3;
768 
769         mark_inode_dirty(inode);
770         d_instantiate(dentry, inode);
771         if (file) {
772                 file->f_mode |= FMODE_CREATED;
773                 error = finish_open(file, dentry, gfs2_open_common);
774         }
775         gfs2_glock_dq_uninit(ghs);
776         gfs2_glock_dq_uninit(ghs + 1);
777         clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
778         return error;
779 
780 fail_gunlock3:
781         glock_clear_object(io_gl, ip);
782         gfs2_glock_dq_uninit(&ip->i_iopen_gh);
783         gfs2_glock_put(io_gl);
784 fail_gunlock2:
785         if (io_gl)
786                 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
787 fail_free_inode:
788         if (ip->i_gl) {
789                 glock_clear_object(ip->i_gl, ip);
790                 gfs2_glock_put(ip->i_gl);
791         }
792         gfs2_rsqa_delete(ip, NULL);
793 fail_free_acls:
794         posix_acl_release(default_acl);
795         posix_acl_release(acl);
796 fail_gunlock:
797         gfs2_dir_no_add(&da);
798         gfs2_glock_dq_uninit(ghs);
799         if (inode && !IS_ERR(inode)) {
800                 clear_nlink(inode);
801                 if (!free_vfs_inode)
802                         mark_inode_dirty(inode);
803                 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
804                         &GFS2_I(inode)->i_flags);
805                 iput(inode);
806         }
807         if (gfs2_holder_initialized(ghs + 1))
808                 gfs2_glock_dq_uninit(ghs + 1);
809 fail:
810         return error;
811 }
812 
813 /**
814  * gfs2_create - Create a file
815  * @dir: The directory in which to create the file
816  * @dentry: The dentry of the new file
817  * @mode: The mode of the new file
818  *
819  * Returns: errno
820  */
821 
822 static int gfs2_create(struct inode *dir, struct dentry *dentry,
823                        umode_t mode, bool excl)
824 {
825         return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
826 }
827 
828 /**
829  * __gfs2_lookup - Look up a filename in a directory and return its inode
830  * @dir: The directory inode
831  * @dentry: The dentry of the new inode
832  * @file: File to be opened
833  *
834  *
835  * Returns: errno
836  */
837 
838 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
839                                     struct file *file)
840 {
841         struct inode *inode;
842         struct dentry *d;
843         struct gfs2_holder gh;
844         struct gfs2_glock *gl;
845         int error;
846 
847         inode = gfs2_lookupi(dir, &dentry->d_name, 0);
848         if (inode == NULL) {
849                 d_add(dentry, NULL);
850                 return NULL;
851         }
852         if (IS_ERR(inode))
853                 return ERR_CAST(inode);
854 
855         gl = GFS2_I(inode)->i_gl;
856         error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
857         if (error) {
858                 iput(inode);
859                 return ERR_PTR(error);
860         }
861 
862         d = d_splice_alias(inode, dentry);
863         if (IS_ERR(d)) {
864                 gfs2_glock_dq_uninit(&gh);
865                 return d;
866         }
867         if (file && S_ISREG(inode->i_mode))
868                 error = finish_open(file, dentry, gfs2_open_common);
869 
870         gfs2_glock_dq_uninit(&gh);
871         if (error) {
872                 dput(d);
873                 return ERR_PTR(error);
874         }
875         return d;
876 }
877 
878 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
879                                   unsigned flags)
880 {
881         return __gfs2_lookup(dir, dentry, NULL);
882 }
883 
884 /**
885  * gfs2_link - Link to a file
886  * @old_dentry: The inode to link
887  * @dir: Add link to this directory
888  * @dentry: The name of the link
889  *
890  * Link the inode in "old_dentry" into the directory "dir" with the
891  * name in "dentry".
892  *
893  * Returns: errno
894  */
895 
896 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
897                      struct dentry *dentry)
898 {
899         struct gfs2_inode *dip = GFS2_I(dir);
900         struct gfs2_sbd *sdp = GFS2_SB(dir);
901         struct inode *inode = d_inode(old_dentry);
902         struct gfs2_inode *ip = GFS2_I(inode);
903         struct gfs2_holder ghs[2];
904         struct buffer_head *dibh;
905         struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
906         int error;
907 
908         if (S_ISDIR(inode->i_mode))
909                 return -EPERM;
910 
911         error = gfs2_rsqa_alloc(dip);
912         if (error)
913                 return error;
914 
915         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
916         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
917 
918         error = gfs2_glock_nq(ghs); /* parent */
919         if (error)
920                 goto out_parent;
921 
922         error = gfs2_glock_nq(ghs + 1); /* child */
923         if (error)
924                 goto out_child;
925 
926         error = -ENOENT;
927         if (inode->i_nlink == 0)
928                 goto out_gunlock;
929 
930         error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
931         if (error)
932                 goto out_gunlock;
933 
934         error = gfs2_dir_check(dir, &dentry->d_name, NULL);
935         switch (error) {
936         case -ENOENT:
937                 break;
938         case 0:
939                 error = -EEXIST;
940         default:
941                 goto out_gunlock;
942         }
943 
944         error = -EINVAL;
945         if (!dip->i_inode.i_nlink)
946                 goto out_gunlock;
947         error = -EFBIG;
948         if (dip->i_entries == (u32)-1)
949                 goto out_gunlock;
950         error = -EPERM;
951         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
952                 goto out_gunlock;
953         error = -EINVAL;
954         if (!ip->i_inode.i_nlink)
955                 goto out_gunlock;
956         error = -EMLINK;
957         if (ip->i_inode.i_nlink == (u32)-1)
958                 goto out_gunlock;
959 
960         error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
961         if (error < 0)
962                 goto out_gunlock;
963 
964         if (da.nr_blocks) {
965                 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
966                 error = gfs2_quota_lock_check(dip, &ap);
967                 if (error)
968                         goto out_gunlock;
969 
970                 error = gfs2_inplace_reserve(dip, &ap);
971                 if (error)
972                         goto out_gunlock_q;
973 
974                 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
975                 if (error)
976                         goto out_ipres;
977         } else {
978                 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
979                 if (error)
980                         goto out_ipres;
981         }
982 
983         error = gfs2_meta_inode_buffer(ip, &dibh);
984         if (error)
985                 goto out_end_trans;
986 
987         error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
988         if (error)
989                 goto out_brelse;
990 
991         gfs2_trans_add_meta(ip->i_gl, dibh);
992         inc_nlink(&ip->i_inode);
993         ip->i_inode.i_ctime = current_time(&ip->i_inode);
994         ihold(inode);
995         d_instantiate(dentry, inode);
996         mark_inode_dirty(inode);
997 
998 out_brelse:
999         brelse(dibh);
1000 out_end_trans:
1001         gfs2_trans_end(sdp);
1002 out_ipres:
1003         if (da.nr_blocks)
1004                 gfs2_inplace_release(dip);
1005 out_gunlock_q:
1006         if (da.nr_blocks)
1007                 gfs2_quota_unlock(dip);
1008 out_gunlock:
1009         gfs2_dir_no_add(&da);
1010         gfs2_glock_dq(ghs + 1);
1011 out_child:
1012         gfs2_glock_dq(ghs);
1013 out_parent:
1014         gfs2_holder_uninit(ghs);
1015         gfs2_holder_uninit(ghs + 1);
1016         return error;
1017 }
1018 
1019 /*
1020  * gfs2_unlink_ok - check to see that a inode is still in a directory
1021  * @dip: the directory
1022  * @name: the name of the file
1023  * @ip: the inode
1024  *
1025  * Assumes that the lock on (at least) @dip is held.
1026  *
1027  * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1028  */
1029 
1030 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1031                           const struct gfs2_inode *ip)
1032 {
1033         int error;
1034 
1035         if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1036                 return -EPERM;
1037 
1038         if ((dip->i_inode.i_mode & S_ISVTX) &&
1039             !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1040             !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1041                 return -EPERM;
1042 
1043         if (IS_APPEND(&dip->i_inode))
1044                 return -EPERM;
1045 
1046         error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1047         if (error)
1048                 return error;
1049 
1050         return gfs2_dir_check(&dip->i_inode, name, ip);
1051 }
1052 
1053 /**
1054  * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1055  * @dip: The parent directory
1056  * @name: The name of the entry in the parent directory
1057  * @inode: The inode to be removed
1058  *
1059  * Called with all the locks and in a transaction. This will only be
1060  * called for a directory after it has been checked to ensure it is empty.
1061  *
1062  * Returns: 0 on success, or an error
1063  */
1064 
1065 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1066                              const struct dentry *dentry)
1067 {
1068         struct inode *inode = d_inode(dentry);
1069         struct gfs2_inode *ip = GFS2_I(inode);
1070         int error;
1071 
1072         error = gfs2_dir_del(dip, dentry);
1073         if (error)
1074                 return error;
1075 
1076         ip->i_entries = 0;
1077         inode->i_ctime = current_time(inode);
1078         if (S_ISDIR(inode->i_mode))
1079                 clear_nlink(inode);
1080         else
1081                 drop_nlink(inode);
1082         mark_inode_dirty(inode);
1083         if (inode->i_nlink == 0)
1084                 gfs2_unlink_di(inode);
1085         return 0;
1086 }
1087 
1088 
1089 /**
1090  * gfs2_unlink - Unlink an inode (this does rmdir as well)
1091  * @dir: The inode of the directory containing the inode to unlink
1092  * @dentry: The file itself
1093  *
1094  * This routine uses the type of the inode as a flag to figure out
1095  * whether this is an unlink or an rmdir.
1096  *
1097  * Returns: errno
1098  */
1099 
1100 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1101 {
1102         struct gfs2_inode *dip = GFS2_I(dir);
1103         struct gfs2_sbd *sdp = GFS2_SB(dir);
1104         struct inode *inode = d_inode(dentry);
1105         struct gfs2_inode *ip = GFS2_I(inode);
1106         struct gfs2_holder ghs[3];
1107         struct gfs2_rgrpd *rgd;
1108         int error;
1109 
1110         error = gfs2_rindex_update(sdp);
1111         if (error)
1112                 return error;
1113 
1114         error = -EROFS;
1115 
1116         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1117         gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
1118 
1119         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1120         if (!rgd)
1121                 goto out_inodes;
1122 
1123         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1124 
1125 
1126         error = gfs2_glock_nq(ghs); /* parent */
1127         if (error)
1128                 goto out_parent;
1129 
1130         error = gfs2_glock_nq(ghs + 1); /* child */
1131         if (error)
1132                 goto out_child;
1133 
1134         error = -ENOENT;
1135         if (inode->i_nlink == 0)
1136                 goto out_rgrp;
1137 
1138         if (S_ISDIR(inode->i_mode)) {
1139                 error = -ENOTEMPTY;
1140                 if (ip->i_entries > 2 || inode->i_nlink > 2)
1141                         goto out_rgrp;
1142         }
1143 
1144         error = gfs2_glock_nq(ghs + 2); /* rgrp */
1145         if (error)
1146                 goto out_rgrp;
1147 
1148         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1149         if (error)
1150                 goto out_gunlock;
1151 
1152         error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1153         if (error)
1154                 goto out_gunlock;
1155 
1156         error = gfs2_unlink_inode(dip, dentry);
1157         gfs2_trans_end(sdp);
1158 
1159 out_gunlock:
1160         gfs2_glock_dq(ghs + 2);
1161 out_rgrp:
1162         gfs2_glock_dq(ghs + 1);
1163 out_child:
1164         gfs2_glock_dq(ghs);
1165 out_parent:
1166         gfs2_holder_uninit(ghs + 2);
1167 out_inodes:
1168         gfs2_holder_uninit(ghs + 1);
1169         gfs2_holder_uninit(ghs);
1170         return error;
1171 }
1172 
1173 /**
1174  * gfs2_symlink - Create a symlink
1175  * @dir: The directory to create the symlink in
1176  * @dentry: The dentry to put the symlink in
1177  * @symname: The thing which the link points to
1178  *
1179  * Returns: errno
1180  */
1181 
1182 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1183                         const char *symname)
1184 {
1185         unsigned int size;
1186 
1187         size = strlen(symname);
1188         if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1189                 return -ENAMETOOLONG;
1190 
1191         return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1192 }
1193 
1194 /**
1195  * gfs2_mkdir - Make a directory
1196  * @dir: The parent directory of the new one
1197  * @dentry: The dentry of the new directory
1198  * @mode: The mode of the new directory
1199  *
1200  * Returns: errno
1201  */
1202 
1203 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1204 {
1205         unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1206         return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1207 }
1208 
1209 /**
1210  * gfs2_mknod - Make a special file
1211  * @dir: The directory in which the special file will reside
1212  * @dentry: The dentry of the special file
1213  * @mode: The mode of the special file
1214  * @dev: The device specification of the special file
1215  *
1216  */
1217 
1218 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1219                       dev_t dev)
1220 {
1221         return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1222 }
1223 
1224 /**
1225  * gfs2_atomic_open - Atomically open a file
1226  * @dir: The directory
1227  * @dentry: The proposed new entry
1228  * @file: The proposed new struct file
1229  * @flags: open flags
1230  * @mode: File mode
1231  *
1232  * Returns: error code or 0 for success
1233  */
1234 
1235 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1236                             struct file *file, unsigned flags,
1237                             umode_t mode)
1238 {
1239         struct dentry *d;
1240         bool excl = !!(flags & O_EXCL);
1241 
1242         if (!d_in_lookup(dentry))
1243                 goto skip_lookup;
1244 
1245         d = __gfs2_lookup(dir, dentry, file);
1246         if (IS_ERR(d))
1247                 return PTR_ERR(d);
1248         if (d != NULL)
1249                 dentry = d;
1250         if (d_really_is_positive(dentry)) {
1251                 if (!(file->f_mode & FMODE_OPENED))
1252                         return finish_no_open(file, d);
1253                 dput(d);
1254                 return 0;
1255         }
1256 
1257         BUG_ON(d != NULL);
1258 
1259 skip_lookup:
1260         if (!(flags & O_CREAT))
1261                 return -ENOENT;
1262 
1263         return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1264 }
1265 
1266 /*
1267  * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1268  * @this: move this
1269  * @to: to here
1270  *
1271  * Follow @to back to the root and make sure we don't encounter @this
1272  * Assumes we already hold the rename lock.
1273  *
1274  * Returns: errno
1275  */
1276 
1277 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1278 {
1279         struct inode *dir = &to->i_inode;
1280         struct super_block *sb = dir->i_sb;
1281         struct inode *tmp;
1282         int error = 0;
1283 
1284         igrab(dir);
1285 
1286         for (;;) {
1287                 if (dir == &this->i_inode) {
1288                         error = -EINVAL;
1289                         break;
1290                 }
1291                 if (dir == d_inode(sb->s_root)) {
1292                         error = 0;
1293                         break;
1294                 }
1295 
1296                 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1297                 if (!tmp) {
1298                         error = -ENOENT;
1299                         break;
1300                 }
1301                 if (IS_ERR(tmp)) {
1302                         error = PTR_ERR(tmp);
1303                         break;
1304                 }
1305 
1306                 iput(dir);
1307                 dir = tmp;
1308         }
1309 
1310         iput(dir);
1311 
1312         return error;
1313 }
1314 
1315 /**
1316  * update_moved_ino - Update an inode that's being moved
1317  * @ip: The inode being moved
1318  * @ndip: The parent directory of the new filename
1319  * @dir_rename: True of ip is a directory
1320  *
1321  * Returns: errno
1322  */
1323 
1324 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1325                             int dir_rename)
1326 {
1327         if (dir_rename)
1328                 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1329 
1330         ip->i_inode.i_ctime = current_time(&ip->i_inode);
1331         mark_inode_dirty_sync(&ip->i_inode);
1332         return 0;
1333 }
1334 
1335 
1336 /**
1337  * gfs2_rename - Rename a file
1338  * @odir: Parent directory of old file name
1339  * @odentry: The old dentry of the file
1340  * @ndir: Parent directory of new file name
1341  * @ndentry: The new dentry of the file
1342  *
1343  * Returns: errno
1344  */
1345 
1346 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1347                        struct inode *ndir, struct dentry *ndentry)
1348 {
1349         struct gfs2_inode *odip = GFS2_I(odir);
1350         struct gfs2_inode *ndip = GFS2_I(ndir);
1351         struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1352         struct gfs2_inode *nip = NULL;
1353         struct gfs2_sbd *sdp = GFS2_SB(odir);
1354         struct gfs2_holder ghs[5], r_gh;
1355         struct gfs2_rgrpd *nrgd;
1356         unsigned int num_gh;
1357         int dir_rename = 0;
1358         struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1359         unsigned int x;
1360         int error;
1361 
1362         gfs2_holder_mark_uninitialized(&r_gh);
1363         if (d_really_is_positive(ndentry)) {
1364                 nip = GFS2_I(d_inode(ndentry));
1365                 if (ip == nip)
1366                         return 0;
1367         }
1368 
1369         error = gfs2_rindex_update(sdp);
1370         if (error)
1371                 return error;
1372 
1373         error = gfs2_rsqa_alloc(ndip);
1374         if (error)
1375                 return error;
1376 
1377         if (odip != ndip) {
1378                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1379                                            0, &r_gh);
1380                 if (error)
1381                         goto out;
1382 
1383                 if (S_ISDIR(ip->i_inode.i_mode)) {
1384                         dir_rename = 1;
1385                         /* don't move a directory into its subdir */
1386                         error = gfs2_ok_to_move(ip, ndip);
1387                         if (error)
1388                                 goto out_gunlock_r;
1389                 }
1390         }
1391 
1392         num_gh = 1;
1393         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1394         if (odip != ndip) {
1395                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1396                 num_gh++;
1397         }
1398         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1399         num_gh++;
1400 
1401         if (nip) {
1402                 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1403                 num_gh++;
1404                 /* grab the resource lock for unlink flag twiddling 
1405                  * this is the case of the target file already existing
1406                  * so we unlink before doing the rename
1407                  */
1408                 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1409                 if (nrgd)
1410                         gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1411         }
1412 
1413         for (x = 0; x < num_gh; x++) {
1414                 error = gfs2_glock_nq(ghs + x);
1415                 if (error)
1416                         goto out_gunlock;
1417         }
1418 
1419         error = -ENOENT;
1420         if (ip->i_inode.i_nlink == 0)
1421                 goto out_gunlock;
1422 
1423         /* Check out the old directory */
1424 
1425         error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1426         if (error)
1427                 goto out_gunlock;
1428 
1429         /* Check out the new directory */
1430 
1431         if (nip) {
1432                 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1433                 if (error)
1434                         goto out_gunlock;
1435 
1436                 if (nip->i_inode.i_nlink == 0) {
1437                         error = -EAGAIN;
1438                         goto out_gunlock;
1439                 }
1440 
1441                 if (S_ISDIR(nip->i_inode.i_mode)) {
1442                         if (nip->i_entries < 2) {
1443                                 gfs2_consist_inode(nip);
1444                                 error = -EIO;
1445                                 goto out_gunlock;
1446                         }
1447                         if (nip->i_entries > 2) {
1448                                 error = -ENOTEMPTY;
1449                                 goto out_gunlock;
1450                         }
1451                 }
1452         } else {
1453                 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1454                 if (error)
1455                         goto out_gunlock;
1456 
1457                 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1458                 switch (error) {
1459                 case -ENOENT:
1460                         error = 0;
1461                         break;
1462                 case 0:
1463                         error = -EEXIST;
1464                 default:
1465                         goto out_gunlock;
1466                 };
1467 
1468                 if (odip != ndip) {
1469                         if (!ndip->i_inode.i_nlink) {
1470                                 error = -ENOENT;
1471                                 goto out_gunlock;
1472                         }
1473                         if (ndip->i_entries == (u32)-1) {
1474                                 error = -EFBIG;
1475                                 goto out_gunlock;
1476                         }
1477                         if (S_ISDIR(ip->i_inode.i_mode) &&
1478                             ndip->i_inode.i_nlink == (u32)-1) {
1479                                 error = -EMLINK;
1480                                 goto out_gunlock;
1481                         }
1482                 }
1483         }
1484 
1485         /* Check out the dir to be renamed */
1486 
1487         if (dir_rename) {
1488                 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1489                 if (error)
1490                         goto out_gunlock;
1491         }
1492 
1493         if (nip == NULL) {
1494                 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1495                 if (error)
1496                         goto out_gunlock;
1497         }
1498 
1499         if (da.nr_blocks) {
1500                 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1501                 error = gfs2_quota_lock_check(ndip, &ap);
1502                 if (error)
1503                         goto out_gunlock;
1504 
1505                 error = gfs2_inplace_reserve(ndip, &ap);
1506                 if (error)
1507                         goto out_gunlock_q;
1508 
1509                 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1510                                          4 * RES_LEAF + 4, 0);
1511                 if (error)
1512                         goto out_ipreserv;
1513         } else {
1514                 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1515                                          5 * RES_LEAF + 4, 0);
1516                 if (error)
1517                         goto out_gunlock;
1518         }
1519 
1520         /* Remove the target file, if it exists */
1521 
1522         if (nip)
1523                 error = gfs2_unlink_inode(ndip, ndentry);
1524 
1525         error = update_moved_ino(ip, ndip, dir_rename);
1526         if (error)
1527                 goto out_end_trans;
1528 
1529         error = gfs2_dir_del(odip, odentry);
1530         if (error)
1531                 goto out_end_trans;
1532 
1533         error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1534         if (error)
1535                 goto out_end_trans;
1536 
1537 out_end_trans:
1538         gfs2_trans_end(sdp);
1539 out_ipreserv:
1540         if (da.nr_blocks)
1541                 gfs2_inplace_release(ndip);
1542 out_gunlock_q:
1543         if (da.nr_blocks)
1544                 gfs2_quota_unlock(ndip);
1545 out_gunlock:
1546         gfs2_dir_no_add(&da);
1547         while (x--) {
1548                 gfs2_glock_dq(ghs + x);
1549                 gfs2_holder_uninit(ghs + x);
1550         }
1551 out_gunlock_r:
1552         if (gfs2_holder_initialized(&r_gh))
1553                 gfs2_glock_dq_uninit(&r_gh);
1554 out:
1555         return error;
1556 }
1557 
1558 /**
1559  * gfs2_exchange - exchange two files
1560  * @odir: Parent directory of old file name
1561  * @odentry: The old dentry of the file
1562  * @ndir: Parent directory of new file name
1563  * @ndentry: The new dentry of the file
1564  * @flags: The rename flags
1565  *
1566  * Returns: errno
1567  */
1568 
1569 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1570                          struct inode *ndir, struct dentry *ndentry,
1571                          unsigned int flags)
1572 {
1573         struct gfs2_inode *odip = GFS2_I(odir);
1574         struct gfs2_inode *ndip = GFS2_I(ndir);
1575         struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1576         struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1577         struct gfs2_sbd *sdp = GFS2_SB(odir);
1578         struct gfs2_holder ghs[5], r_gh;
1579         unsigned int num_gh;
1580         unsigned int x;
1581         umode_t old_mode = oip->i_inode.i_mode;
1582         umode_t new_mode = nip->i_inode.i_mode;
1583         int error;
1584 
1585         gfs2_holder_mark_uninitialized(&r_gh);
1586         error = gfs2_rindex_update(sdp);
1587         if (error)
1588                 return error;
1589 
1590         if (odip != ndip) {
1591                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1592                                            0, &r_gh);
1593                 if (error)
1594                         goto out;
1595 
1596                 if (S_ISDIR(old_mode)) {
1597                         /* don't move a directory into its subdir */
1598                         error = gfs2_ok_to_move(oip, ndip);
1599                         if (error)
1600                                 goto out_gunlock_r;
1601                 }
1602 
1603                 if (S_ISDIR(new_mode)) {
1604                         /* don't move a directory into its subdir */
1605                         error = gfs2_ok_to_move(nip, odip);
1606                         if (error)
1607                                 goto out_gunlock_r;
1608                 }
1609         }
1610 
1611         num_gh = 1;
1612         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1613         if (odip != ndip) {
1614                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1615                 num_gh++;
1616         }
1617         gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1618         num_gh++;
1619 
1620         gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1621         num_gh++;
1622 
1623         for (x = 0; x < num_gh; x++) {
1624                 error = gfs2_glock_nq(ghs + x);
1625                 if (error)
1626                         goto out_gunlock;
1627         }
1628 
1629         error = -ENOENT;
1630         if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1631                 goto out_gunlock;
1632 
1633         error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1634         if (error)
1635                 goto out_gunlock;
1636         error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1637         if (error)
1638                 goto out_gunlock;
1639 
1640         if (S_ISDIR(old_mode)) {
1641                 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1642                 if (error)
1643                         goto out_gunlock;
1644         }
1645         if (S_ISDIR(new_mode)) {
1646                 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1647                 if (error)
1648                         goto out_gunlock;
1649         }
1650         error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1651         if (error)
1652                 goto out_gunlock;
1653 
1654         error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1655         if (error)
1656                 goto out_end_trans;
1657 
1658         error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1659         if (error)
1660                 goto out_end_trans;
1661 
1662         error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1663                                IF2DT(old_mode));
1664         if (error)
1665                 goto out_end_trans;
1666 
1667         error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1668                                IF2DT(new_mode));
1669         if (error)
1670                 goto out_end_trans;
1671 
1672         if (odip != ndip) {
1673                 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1674                         inc_nlink(&odip->i_inode);
1675                         drop_nlink(&ndip->i_inode);
1676                 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1677                         inc_nlink(&ndip->i_inode);
1678                         drop_nlink(&odip->i_inode);
1679                 }
1680         }
1681         mark_inode_dirty(&ndip->i_inode);
1682         if (odip != ndip)
1683                 mark_inode_dirty(&odip->i_inode);
1684 
1685 out_end_trans:
1686         gfs2_trans_end(sdp);
1687 out_gunlock:
1688         while (x--) {
1689                 gfs2_glock_dq(ghs + x);
1690                 gfs2_holder_uninit(ghs + x);
1691         }
1692 out_gunlock_r:
1693         if (gfs2_holder_initialized(&r_gh))
1694                 gfs2_glock_dq_uninit(&r_gh);
1695 out:
1696         return error;
1697 }
1698 
1699 static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1700                         struct inode *ndir, struct dentry *ndentry,
1701                         unsigned int flags)
1702 {
1703         flags &= ~RENAME_NOREPLACE;
1704 
1705         if (flags & ~RENAME_EXCHANGE)
1706                 return -EINVAL;
1707 
1708         if (flags & RENAME_EXCHANGE)
1709                 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1710 
1711         return gfs2_rename(odir, odentry, ndir, ndentry);
1712 }
1713 
1714 /**
1715  * gfs2_get_link - Follow a symbolic link
1716  * @dentry: The dentry of the link
1717  * @inode: The inode of the link
1718  * @done: destructor for return value
1719  *
1720  * This can handle symlinks of any size.
1721  *
1722  * Returns: 0 on success or error code
1723  */
1724 
1725 static const char *gfs2_get_link(struct dentry *dentry,
1726                                  struct inode *inode,
1727                                  struct delayed_call *done)
1728 {
1729         struct gfs2_inode *ip = GFS2_I(inode);
1730         struct gfs2_holder i_gh;
1731         struct buffer_head *dibh;
1732         unsigned int size;
1733         char *buf;
1734         int error;
1735 
1736         if (!dentry)
1737                 return ERR_PTR(-ECHILD);
1738 
1739         gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1740         error = gfs2_glock_nq(&i_gh);
1741         if (error) {
1742                 gfs2_holder_uninit(&i_gh);
1743                 return ERR_PTR(error);
1744         }
1745 
1746         size = (unsigned int)i_size_read(&ip->i_inode);
1747         if (size == 0) {
1748                 gfs2_consist_inode(ip);
1749                 buf = ERR_PTR(-EIO);
1750                 goto out;
1751         }
1752 
1753         error = gfs2_meta_inode_buffer(ip, &dibh);
1754         if (error) {
1755                 buf = ERR_PTR(error);
1756                 goto out;
1757         }
1758 
1759         buf = kzalloc(size + 1, GFP_NOFS);
1760         if (!buf)
1761                 buf = ERR_PTR(-ENOMEM);
1762         else
1763                 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1764         brelse(dibh);
1765 out:
1766         gfs2_glock_dq_uninit(&i_gh);
1767         if (!IS_ERR(buf))
1768                 set_delayed_call(done, kfree_link, buf);
1769         return buf;
1770 }
1771 
1772 /**
1773  * gfs2_permission -
1774  * @inode: The inode
1775  * @mask: The mask to be tested
1776  * @flags: Indicates whether this is an RCU path walk or not
1777  *
1778  * This may be called from the VFS directly, or from within GFS2 with the
1779  * inode locked, so we look to see if the glock is already locked and only
1780  * lock the glock if its not already been done.
1781  *
1782  * Returns: errno
1783  */
1784 
1785 int gfs2_permission(struct inode *inode, int mask)
1786 {
1787         struct gfs2_inode *ip;
1788         struct gfs2_holder i_gh;
1789         int error;
1790 
1791         gfs2_holder_mark_uninitialized(&i_gh);
1792         ip = GFS2_I(inode);
1793         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1794                 if (mask & MAY_NOT_BLOCK)
1795                         return -ECHILD;
1796                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1797                 if (error)
1798                         return error;
1799         }
1800 
1801         if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1802                 error = -EPERM;
1803         else
1804                 error = generic_permission(inode, mask);
1805         if (gfs2_holder_initialized(&i_gh))
1806                 gfs2_glock_dq_uninit(&i_gh);
1807 
1808         return error;
1809 }
1810 
1811 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1812 {
1813         setattr_copy(inode, attr);
1814         mark_inode_dirty(inode);
1815         return 0;
1816 }
1817 
1818 /**
1819  * gfs2_setattr_simple -
1820  * @ip:
1821  * @attr:
1822  *
1823  * Returns: errno
1824  */
1825 
1826 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1827 {
1828         int error;
1829 
1830         if (current->journal_info)
1831                 return __gfs2_setattr_simple(inode, attr);
1832 
1833         error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1834         if (error)
1835                 return error;
1836 
1837         error = __gfs2_setattr_simple(inode, attr);
1838         gfs2_trans_end(GFS2_SB(inode));
1839         return error;
1840 }
1841 
1842 static int setattr_chown(struct inode *inode, struct iattr *attr)
1843 {
1844         struct gfs2_inode *ip = GFS2_I(inode);
1845         struct gfs2_sbd *sdp = GFS2_SB(inode);
1846         kuid_t ouid, nuid;
1847         kgid_t ogid, ngid;
1848         int error;
1849         struct gfs2_alloc_parms ap;
1850 
1851         ouid = inode->i_uid;
1852         ogid = inode->i_gid;
1853         nuid = attr->ia_uid;
1854         ngid = attr->ia_gid;
1855 
1856         if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1857                 ouid = nuid = NO_UID_QUOTA_CHANGE;
1858         if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1859                 ogid = ngid = NO_GID_QUOTA_CHANGE;
1860 
1861         error = gfs2_rsqa_alloc(ip);
1862         if (error)
1863                 goto out;
1864 
1865         error = gfs2_rindex_update(sdp);
1866         if (error)
1867                 goto out;
1868 
1869         error = gfs2_quota_lock(ip, nuid, ngid);
1870         if (error)
1871                 goto out;
1872 
1873         ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1874 
1875         if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1876             !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1877                 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1878                 if (error)
1879                         goto out_gunlock_q;
1880         }
1881 
1882         error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1883         if (error)
1884                 goto out_gunlock_q;
1885 
1886         error = gfs2_setattr_simple(inode, attr);
1887         if (error)
1888                 goto out_end_trans;
1889 
1890         if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1891             !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1892                 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1893                 gfs2_quota_change(ip, ap.target, nuid, ngid);
1894         }
1895 
1896 out_end_trans:
1897         gfs2_trans_end(sdp);
1898 out_gunlock_q:
1899         gfs2_quota_unlock(ip);
1900 out:
1901         return error;
1902 }
1903 
1904 /**
1905  * gfs2_setattr - Change attributes on an inode
1906  * @dentry: The dentry which is changing
1907  * @attr: The structure describing the change
1908  *
1909  * The VFS layer wants to change one or more of an inodes attributes.  Write
1910  * that change out to disk.
1911  *
1912  * Returns: errno
1913  */
1914 
1915 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1916 {
1917         struct inode *inode = d_inode(dentry);
1918         struct gfs2_inode *ip = GFS2_I(inode);
1919         struct gfs2_holder i_gh;
1920         int error;
1921 
1922         error = gfs2_rsqa_alloc(ip);
1923         if (error)
1924                 return error;
1925 
1926         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1927         if (error)
1928                 return error;
1929 
1930         error = -EPERM;
1931         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1932                 goto out;
1933 
1934         error = setattr_prepare(dentry, attr);
1935         if (error)
1936                 goto out;
1937 
1938         if (attr->ia_valid & ATTR_SIZE)
1939                 error = gfs2_setattr_size(inode, attr->ia_size);
1940         else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1941                 error = setattr_chown(inode, attr);
1942         else {
1943                 error = gfs2_setattr_simple(inode, attr);
1944                 if (!error && attr->ia_valid & ATTR_MODE)
1945                         error = posix_acl_chmod(inode, inode->i_mode);
1946         }
1947 
1948 out:
1949         if (!error)
1950                 mark_inode_dirty(inode);
1951         gfs2_glock_dq_uninit(&i_gh);
1952         return error;
1953 }
1954 
1955 /**
1956  * gfs2_getattr - Read out an inode's attributes
1957  * @path: Object to query
1958  * @stat: The inode's stats
1959  * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1960  * @flags: AT_STATX_xxx setting
1961  *
1962  * This may be called from the VFS directly, or from within GFS2 with the
1963  * inode locked, so we look to see if the glock is already locked and only
1964  * lock the glock if its not already been done. Note that its the NFS
1965  * readdirplus operation which causes this to be called (from filldir)
1966  * with the glock already held.
1967  *
1968  * Returns: errno
1969  */
1970 
1971 static int gfs2_getattr(const struct path *path, struct kstat *stat,
1972                         u32 request_mask, unsigned int flags)
1973 {
1974         struct inode *inode = d_inode(path->dentry);
1975         struct gfs2_inode *ip = GFS2_I(inode);
1976         struct gfs2_holder gh;
1977         u32 gfsflags;
1978         int error;
1979 
1980         gfs2_holder_mark_uninitialized(&gh);
1981         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1982                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1983                 if (error)
1984                         return error;
1985         }
1986 
1987         gfsflags = ip->i_diskflags;
1988         if (gfsflags & GFS2_DIF_APPENDONLY)
1989                 stat->attributes |= STATX_ATTR_APPEND;
1990         if (gfsflags & GFS2_DIF_IMMUTABLE)
1991                 stat->attributes |= STATX_ATTR_IMMUTABLE;
1992 
1993         stat->attributes_mask |= (STATX_ATTR_APPEND |
1994                                   STATX_ATTR_COMPRESSED |
1995                                   STATX_ATTR_ENCRYPTED |
1996                                   STATX_ATTR_IMMUTABLE |
1997                                   STATX_ATTR_NODUMP);
1998 
1999         generic_fillattr(inode, stat);
2000 
2001         if (gfs2_holder_initialized(&gh))
2002                 gfs2_glock_dq_uninit(&gh);
2003 
2004         return 0;
2005 }
2006 
2007 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2008                        u64 start, u64 len)
2009 {
2010         struct gfs2_inode *ip = GFS2_I(inode);
2011         struct gfs2_holder gh;
2012         int ret;
2013 
2014         inode_lock_shared(inode);
2015 
2016         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2017         if (ret)
2018                 goto out;
2019 
2020         ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2021 
2022         gfs2_glock_dq_uninit(&gh);
2023 
2024 out:
2025         inode_unlock_shared(inode);
2026         return ret;
2027 }
2028 
2029 loff_t gfs2_seek_data(struct file *file, loff_t offset)
2030 {
2031         struct inode *inode = file->f_mapping->host;
2032         struct gfs2_inode *ip = GFS2_I(inode);
2033         struct gfs2_holder gh;
2034         loff_t ret;
2035 
2036         inode_lock_shared(inode);
2037         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2038         if (!ret)
2039                 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2040         gfs2_glock_dq_uninit(&gh);
2041         inode_unlock_shared(inode);
2042 
2043         if (ret < 0)
2044                 return ret;
2045         return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2046 }
2047 
2048 loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2049 {
2050         struct inode *inode = file->f_mapping->host;
2051         struct gfs2_inode *ip = GFS2_I(inode);
2052         struct gfs2_holder gh;
2053         loff_t ret;
2054 
2055         inode_lock_shared(inode);
2056         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2057         if (!ret)
2058                 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2059         gfs2_glock_dq_uninit(&gh);
2060         inode_unlock_shared(inode);
2061 
2062         if (ret < 0)
2063                 return ret;
2064         return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2065 }
2066 
2067 const struct inode_operations gfs2_file_iops = {
2068         .permission = gfs2_permission,
2069         .setattr = gfs2_setattr,
2070         .getattr = gfs2_getattr,
2071         .listxattr = gfs2_listxattr,
2072         .fiemap = gfs2_fiemap,
2073         .get_acl = gfs2_get_acl,
2074         .set_acl = gfs2_set_acl,
2075 };
2076 
2077 const struct inode_operations gfs2_dir_iops = {
2078         .create = gfs2_create,
2079         .lookup = gfs2_lookup,
2080         .link = gfs2_link,
2081         .unlink = gfs2_unlink,
2082         .symlink = gfs2_symlink,
2083         .mkdir = gfs2_mkdir,
2084         .rmdir = gfs2_unlink,
2085         .mknod = gfs2_mknod,
2086         .rename = gfs2_rename2,
2087         .permission = gfs2_permission,
2088         .setattr = gfs2_setattr,
2089         .getattr = gfs2_getattr,
2090         .listxattr = gfs2_listxattr,
2091         .fiemap = gfs2_fiemap,
2092         .get_acl = gfs2_get_acl,
2093         .set_acl = gfs2_set_acl,
2094         .atomic_open = gfs2_atomic_open,
2095 };
2096 
2097 const struct inode_operations gfs2_symlink_iops = {
2098         .get_link = gfs2_get_link,
2099         .permission = gfs2_permission,
2100         .setattr = gfs2_setattr,
2101         .getattr = gfs2_getattr,
2102         .listxattr = gfs2_listxattr,
2103         .fiemap = gfs2_fiemap,
2104 };
2105 
2106 

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