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

Version: ~ [ linux-5.4-rc3 ] ~ [ linux-5.3.6 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.79 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.149 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.196 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.196 ] ~ [ 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-3.16.75 ] ~ [ 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 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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(-ENOMEM);
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 == d_inode(sb->s_root))) {
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, unsigned *dblocks)
380 {
381         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
382         struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
383         int error;
384 
385         error = gfs2_quota_lock_check(ip, &ap);
386         if (error)
387                 goto out;
388 
389         error = gfs2_inplace_reserve(ip, &ap);
390         if (error)
391                 goto out_quota;
392 
393         error = gfs2_trans_begin(sdp, (*dblocks * 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  * gfs2_init_xattr - Initialise an xattr block for a new inode
431  * @ip: The inode in question
432  *
433  * This sets up an empty xattr block for a new inode, ready to
434  * take any ACLs, LSM xattrs, etc.
435  */
436 
437 static void gfs2_init_xattr(struct gfs2_inode *ip)
438 {
439         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
440         struct buffer_head *bh;
441         struct gfs2_ea_header *ea;
442 
443         bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
444         gfs2_trans_add_meta(ip->i_gl, bh);
445         gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
446         gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
447 
448         ea = GFS2_EA_BH2FIRST(bh);
449         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
450         ea->ea_type = GFS2_EATYPE_UNUSED;
451         ea->ea_flags = GFS2_EAFLAG_LAST;
452 
453         brelse(bh);
454 }
455 
456 /**
457  * init_dinode - Fill in a new dinode structure
458  * @dip: The directory this inode is being created in
459  * @ip: The inode
460  * @symname: The symlink destination (if a symlink)
461  * @bhp: The buffer head (returned to caller)
462  *
463  */
464 
465 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
466                         const char *symname)
467 {
468         struct gfs2_dinode *di;
469         struct buffer_head *dibh;
470 
471         dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
472         gfs2_trans_add_meta(ip->i_gl, dibh);
473         di = (struct gfs2_dinode *)dibh->b_data;
474         gfs2_dinode_out(ip, di);
475 
476         di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
477         di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
478         di->__pad1 = 0;
479         di->__pad2 = 0;
480         di->__pad3 = 0;
481         memset(&di->__pad4, 0, sizeof(di->__pad4));
482         memset(&di->di_reserved, 0, sizeof(di->di_reserved));
483         gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
484 
485         switch(ip->i_inode.i_mode & S_IFMT) {
486         case S_IFDIR:
487                 gfs2_init_dir(dibh, dip);
488                 break;
489         case S_IFLNK:
490                 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
491                 break;
492         }
493 
494         set_buffer_uptodate(dibh);
495         brelse(dibh);
496 }
497 
498 /**
499  * gfs2_trans_da_blocks - Calculate number of blocks to link inode
500  * @dip: The directory we are linking into
501  * @da: The dir add information
502  * @nr_inodes: The number of inodes involved
503  *
504  * This calculate the number of blocks we need to reserve in a
505  * transaction to link @nr_inodes into a directory. In most cases
506  * @nr_inodes will be 2 (the directory plus the inode being linked in)
507  * but in case of rename, 4 may be required.
508  *
509  * Returns: Number of blocks
510  */
511 
512 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
513                                    const struct gfs2_diradd *da,
514                                    unsigned nr_inodes)
515 {
516         return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
517                (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
518 }
519 
520 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
521                        struct gfs2_inode *ip, struct gfs2_diradd *da)
522 {
523         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
524         struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
525         int error;
526 
527         if (da->nr_blocks) {
528                 error = gfs2_quota_lock_check(dip, &ap);
529                 if (error)
530                         goto fail_quota_locks;
531 
532                 error = gfs2_inplace_reserve(dip, &ap);
533                 if (error)
534                         goto fail_quota_locks;
535 
536                 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
537                 if (error)
538                         goto fail_ipreserv;
539         } else {
540                 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
541                 if (error)
542                         goto fail_quota_locks;
543         }
544 
545         error = gfs2_dir_add(&dip->i_inode, name, ip, da);
546 
547         gfs2_trans_end(sdp);
548 fail_ipreserv:
549         gfs2_inplace_release(dip);
550 fail_quota_locks:
551         gfs2_quota_unlock(dip);
552         return error;
553 }
554 
555 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
556                     void *fs_info)
557 {
558         const struct xattr *xattr;
559         int err = 0;
560 
561         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
562                 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
563                                        xattr->value_len, 0,
564                                        GFS2_EATYPE_SECURITY);
565                 if (err < 0)
566                         break;
567         }
568         return err;
569 }
570 
571 /**
572  * gfs2_create_inode - Create a new inode
573  * @dir: The parent directory
574  * @dentry: The new dentry
575  * @file: If non-NULL, the file which is being opened
576  * @mode: The permissions on the new inode
577  * @dev: For device nodes, this is the device number
578  * @symname: For symlinks, this is the link destination
579  * @size: The initial size of the inode (ignored for directories)
580  *
581  * Returns: 0 on success, or error code
582  */
583 
584 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
585                              struct file *file,
586                              umode_t mode, dev_t dev, const char *symname,
587                              unsigned int size, int excl, int *opened)
588 {
589         const struct qstr *name = &dentry->d_name;
590         struct posix_acl *default_acl, *acl;
591         struct gfs2_holder ghs[2];
592         struct inode *inode = NULL;
593         struct gfs2_inode *dip = GFS2_I(dir), *ip;
594         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
595         struct gfs2_glock *io_gl;
596         int error, free_vfs_inode = 0;
597         u32 aflags = 0;
598         unsigned blocks = 1;
599         struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
600 
601         if (!name->len || name->len > GFS2_FNAMESIZE)
602                 return -ENAMETOOLONG;
603 
604         error = gfs2_rs_alloc(dip);
605         if (error)
606                 return error;
607 
608         error = gfs2_rindex_update(sdp);
609         if (error)
610                 return error;
611 
612         error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
613         if (error)
614                 goto fail;
615 
616         error = create_ok(dip, name, mode);
617         if (error)
618                 goto fail_gunlock;
619 
620         inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
621         error = PTR_ERR(inode);
622         if (!IS_ERR(inode)) {
623                 if (S_ISDIR(inode->i_mode)) {
624                         iput(inode);
625                         inode = ERR_PTR(-EISDIR);
626                         goto fail_gunlock;
627                 }
628                 d_instantiate(dentry, inode);
629                 error = 0;
630                 if (file) {
631                         if (S_ISREG(inode->i_mode))
632                                 error = finish_open(file, dentry, gfs2_open_common, opened);
633                         else
634                                 error = finish_no_open(file, NULL);
635                 }
636                 gfs2_glock_dq_uninit(ghs);
637                 return error;
638         } else if (error != -ENOENT) {
639                 goto fail_gunlock;
640         }
641 
642         error = gfs2_diradd_alloc_required(dir, name, &da);
643         if (error < 0)
644                 goto fail_gunlock;
645 
646         inode = new_inode(sdp->sd_vfs);
647         error = -ENOMEM;
648         if (!inode)
649                 goto fail_gunlock;
650 
651         error = posix_acl_create(dir, &mode, &default_acl, &acl);
652         if (error)
653                 goto fail_free_vfs_inode;
654 
655         ip = GFS2_I(inode);
656         error = gfs2_rs_alloc(ip);
657         if (error)
658                 goto fail_free_acls;
659 
660         inode->i_mode = mode;
661         set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
662         inode->i_rdev = dev;
663         inode->i_size = size;
664         inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
665         gfs2_set_inode_blocks(inode, 1);
666         munge_mode_uid_gid(dip, inode);
667         check_and_update_goal(dip);
668         ip->i_goal = dip->i_goal;
669         ip->i_diskflags = 0;
670         ip->i_eattr = 0;
671         ip->i_height = 0;
672         ip->i_depth = 0;
673         ip->i_entries = 0;
674 
675         switch(mode & S_IFMT) {
676         case S_IFREG:
677                 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
678                     gfs2_tune_get(sdp, gt_new_files_jdata))
679                         ip->i_diskflags |= GFS2_DIF_JDATA;
680                 gfs2_set_aops(inode);
681                 break;
682         case S_IFDIR:
683                 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
684                 ip->i_diskflags |= GFS2_DIF_JDATA;
685                 ip->i_entries = 2;
686                 break;
687         }
688         gfs2_set_inode_flags(inode);
689 
690         if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
691             (dip->i_diskflags & GFS2_DIF_TOPDIR))
692                 aflags |= GFS2_AF_ORLOV;
693 
694         if (default_acl || acl)
695                 blocks++;
696 
697         error = alloc_dinode(ip, aflags, &blocks);
698         if (error)
699                 goto fail_free_inode;
700 
701         gfs2_set_inode_blocks(inode, blocks);
702 
703         error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
704         if (error)
705                 goto fail_free_inode;
706 
707         ip->i_gl->gl_object = ip;
708         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
709         if (error)
710                 goto fail_free_inode;
711 
712         error = gfs2_trans_begin(sdp, blocks, 0);
713         if (error)
714                 goto fail_gunlock2;
715 
716         if (blocks > 1) {
717                 ip->i_eattr = ip->i_no_addr + 1;
718                 gfs2_init_xattr(ip);
719         }
720         init_dinode(dip, ip, symname);
721         gfs2_trans_end(sdp);
722 
723         error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
724         if (error)
725                 goto fail_gunlock2;
726 
727         error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
728         if (error)
729                 goto fail_gunlock2;
730 
731         ip->i_iopen_gh.gh_gl->gl_object = ip;
732         gfs2_glock_put(io_gl);
733         gfs2_set_iop(inode);
734         insert_inode_hash(inode);
735 
736         if (default_acl) {
737                 error = gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
738                 posix_acl_release(default_acl);
739         }
740         if (acl) {
741                 if (!error)
742                         error = gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
743                 posix_acl_release(acl);
744         }
745 
746         if (error)
747                 goto fail_gunlock3;
748 
749         error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
750                                              &gfs2_initxattrs, NULL);
751         if (error)
752                 goto fail_gunlock3;
753 
754         error = link_dinode(dip, name, ip, &da);
755         if (error)
756                 goto fail_gunlock3;
757 
758         mark_inode_dirty(inode);
759         d_instantiate(dentry, inode);
760         if (file) {
761                 *opened |= FILE_CREATED;
762                 error = finish_open(file, dentry, gfs2_open_common, opened);
763         }
764         gfs2_glock_dq_uninit(ghs);
765         gfs2_glock_dq_uninit(ghs + 1);
766         return error;
767 
768 fail_gunlock3:
769         gfs2_glock_dq_uninit(ghs + 1);
770         if (ip->i_gl)
771                 gfs2_glock_put(ip->i_gl);
772         goto fail_gunlock;
773 
774 fail_gunlock2:
775         gfs2_glock_dq_uninit(ghs + 1);
776 fail_free_inode:
777         if (ip->i_gl)
778                 gfs2_glock_put(ip->i_gl);
779         gfs2_rs_delete(ip, NULL);
780 fail_free_acls:
781         if (default_acl)
782                 posix_acl_release(default_acl);
783         if (acl)
784                 posix_acl_release(acl);
785 fail_free_vfs_inode:
786         free_vfs_inode = 1;
787 fail_gunlock:
788         gfs2_dir_no_add(&da);
789         gfs2_glock_dq_uninit(ghs);
790         if (inode && !IS_ERR(inode)) {
791                 clear_nlink(inode);
792                 if (!free_vfs_inode)
793                         mark_inode_dirty(inode);
794                 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
795                         &GFS2_I(inode)->i_flags);
796                 iput(inode);
797         }
798 fail:
799         return error;
800 }
801 
802 /**
803  * gfs2_create - Create a file
804  * @dir: The directory in which to create the file
805  * @dentry: The dentry of the new file
806  * @mode: The mode of the new file
807  *
808  * Returns: errno
809  */
810 
811 static int gfs2_create(struct inode *dir, struct dentry *dentry,
812                        umode_t mode, bool excl)
813 {
814         return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl, NULL);
815 }
816 
817 /**
818  * __gfs2_lookup - Look up a filename in a directory and return its inode
819  * @dir: The directory inode
820  * @dentry: The dentry of the new inode
821  * @file: File to be opened
822  * @opened: atomic_open flags
823  *
824  *
825  * Returns: errno
826  */
827 
828 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
829                                     struct file *file, int *opened)
830 {
831         struct inode *inode;
832         struct dentry *d;
833         struct gfs2_holder gh;
834         struct gfs2_glock *gl;
835         int error;
836 
837         inode = gfs2_lookupi(dir, &dentry->d_name, 0);
838         if (inode == NULL) {
839                 d_add(dentry, NULL);
840                 return NULL;
841         }
842         if (IS_ERR(inode))
843                 return ERR_CAST(inode);
844 
845         gl = GFS2_I(inode)->i_gl;
846         error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
847         if (error) {
848                 iput(inode);
849                 return ERR_PTR(error);
850         }
851 
852         d = d_splice_alias(inode, dentry);
853         if (IS_ERR(d)) {
854                 gfs2_glock_dq_uninit(&gh);
855                 return d;
856         }
857         if (file && S_ISREG(inode->i_mode))
858                 error = finish_open(file, dentry, gfs2_open_common, opened);
859 
860         gfs2_glock_dq_uninit(&gh);
861         if (error) {
862                 dput(d);
863                 return ERR_PTR(error);
864         }
865         return d;
866 }
867 
868 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
869                                   unsigned flags)
870 {
871         return __gfs2_lookup(dir, dentry, NULL, NULL);
872 }
873 
874 /**
875  * gfs2_link - Link to a file
876  * @old_dentry: The inode to link
877  * @dir: Add link to this directory
878  * @dentry: The name of the link
879  *
880  * Link the inode in "old_dentry" into the directory "dir" with the
881  * name in "dentry".
882  *
883  * Returns: errno
884  */
885 
886 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
887                      struct dentry *dentry)
888 {
889         struct gfs2_inode *dip = GFS2_I(dir);
890         struct gfs2_sbd *sdp = GFS2_SB(dir);
891         struct inode *inode = d_inode(old_dentry);
892         struct gfs2_inode *ip = GFS2_I(inode);
893         struct gfs2_holder ghs[2];
894         struct buffer_head *dibh;
895         struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
896         int error;
897 
898         if (S_ISDIR(inode->i_mode))
899                 return -EPERM;
900 
901         error = gfs2_rs_alloc(dip);
902         if (error)
903                 return error;
904 
905         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
906         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
907 
908         error = gfs2_glock_nq(ghs); /* parent */
909         if (error)
910                 goto out_parent;
911 
912         error = gfs2_glock_nq(ghs + 1); /* child */
913         if (error)
914                 goto out_child;
915 
916         error = -ENOENT;
917         if (inode->i_nlink == 0)
918                 goto out_gunlock;
919 
920         error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
921         if (error)
922                 goto out_gunlock;
923 
924         error = gfs2_dir_check(dir, &dentry->d_name, NULL);
925         switch (error) {
926         case -ENOENT:
927                 break;
928         case 0:
929                 error = -EEXIST;
930         default:
931                 goto out_gunlock;
932         }
933 
934         error = -EINVAL;
935         if (!dip->i_inode.i_nlink)
936                 goto out_gunlock;
937         error = -EFBIG;
938         if (dip->i_entries == (u32)-1)
939                 goto out_gunlock;
940         error = -EPERM;
941         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
942                 goto out_gunlock;
943         error = -EINVAL;
944         if (!ip->i_inode.i_nlink)
945                 goto out_gunlock;
946         error = -EMLINK;
947         if (ip->i_inode.i_nlink == (u32)-1)
948                 goto out_gunlock;
949 
950         error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
951         if (error < 0)
952                 goto out_gunlock;
953 
954         if (da.nr_blocks) {
955                 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
956                 error = gfs2_quota_lock_check(dip, &ap);
957                 if (error)
958                         goto out_gunlock;
959 
960                 error = gfs2_inplace_reserve(dip, &ap);
961                 if (error)
962                         goto out_gunlock_q;
963 
964                 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
965                 if (error)
966                         goto out_ipres;
967         } else {
968                 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
969                 if (error)
970                         goto out_ipres;
971         }
972 
973         error = gfs2_meta_inode_buffer(ip, &dibh);
974         if (error)
975                 goto out_end_trans;
976 
977         error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
978         if (error)
979                 goto out_brelse;
980 
981         gfs2_trans_add_meta(ip->i_gl, dibh);
982         inc_nlink(&ip->i_inode);
983         ip->i_inode.i_ctime = CURRENT_TIME;
984         ihold(inode);
985         d_instantiate(dentry, inode);
986         mark_inode_dirty(inode);
987 
988 out_brelse:
989         brelse(dibh);
990 out_end_trans:
991         gfs2_trans_end(sdp);
992 out_ipres:
993         if (da.nr_blocks)
994                 gfs2_inplace_release(dip);
995 out_gunlock_q:
996         if (da.nr_blocks)
997                 gfs2_quota_unlock(dip);
998 out_gunlock:
999         gfs2_dir_no_add(&da);
1000         gfs2_glock_dq(ghs + 1);
1001 out_child:
1002         gfs2_glock_dq(ghs);
1003 out_parent:
1004         gfs2_holder_uninit(ghs);
1005         gfs2_holder_uninit(ghs + 1);
1006         return error;
1007 }
1008 
1009 /*
1010  * gfs2_unlink_ok - check to see that a inode is still in a directory
1011  * @dip: the directory
1012  * @name: the name of the file
1013  * @ip: the inode
1014  *
1015  * Assumes that the lock on (at least) @dip is held.
1016  *
1017  * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1018  */
1019 
1020 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1021                           const struct gfs2_inode *ip)
1022 {
1023         int error;
1024 
1025         if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1026                 return -EPERM;
1027 
1028         if ((dip->i_inode.i_mode & S_ISVTX) &&
1029             !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1030             !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1031                 return -EPERM;
1032 
1033         if (IS_APPEND(&dip->i_inode))
1034                 return -EPERM;
1035 
1036         error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1037         if (error)
1038                 return error;
1039 
1040         return gfs2_dir_check(&dip->i_inode, name, ip);
1041 }
1042 
1043 /**
1044  * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1045  * @dip: The parent directory
1046  * @name: The name of the entry in the parent directory
1047  * @inode: The inode to be removed
1048  *
1049  * Called with all the locks and in a transaction. This will only be
1050  * called for a directory after it has been checked to ensure it is empty.
1051  *
1052  * Returns: 0 on success, or an error
1053  */
1054 
1055 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1056                              const struct dentry *dentry)
1057 {
1058         struct inode *inode = d_inode(dentry);
1059         struct gfs2_inode *ip = GFS2_I(inode);
1060         int error;
1061 
1062         error = gfs2_dir_del(dip, dentry);
1063         if (error)
1064                 return error;
1065 
1066         ip->i_entries = 0;
1067         inode->i_ctime = CURRENT_TIME;
1068         if (S_ISDIR(inode->i_mode))
1069                 clear_nlink(inode);
1070         else
1071                 drop_nlink(inode);
1072         mark_inode_dirty(inode);
1073         if (inode->i_nlink == 0)
1074                 gfs2_unlink_di(inode);
1075         return 0;
1076 }
1077 
1078 
1079 /**
1080  * gfs2_unlink - Unlink an inode (this does rmdir as well)
1081  * @dir: The inode of the directory containing the inode to unlink
1082  * @dentry: The file itself
1083  *
1084  * This routine uses the type of the inode as a flag to figure out
1085  * whether this is an unlink or an rmdir.
1086  *
1087  * Returns: errno
1088  */
1089 
1090 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1091 {
1092         struct gfs2_inode *dip = GFS2_I(dir);
1093         struct gfs2_sbd *sdp = GFS2_SB(dir);
1094         struct inode *inode = d_inode(dentry);
1095         struct gfs2_inode *ip = GFS2_I(inode);
1096         struct gfs2_holder ghs[3];
1097         struct gfs2_rgrpd *rgd;
1098         int error;
1099 
1100         error = gfs2_rindex_update(sdp);
1101         if (error)
1102                 return error;
1103 
1104         error = -EROFS;
1105 
1106         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1107         gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
1108 
1109         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1110         if (!rgd)
1111                 goto out_inodes;
1112 
1113         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1114 
1115 
1116         error = gfs2_glock_nq(ghs); /* parent */
1117         if (error)
1118                 goto out_parent;
1119 
1120         error = gfs2_glock_nq(ghs + 1); /* child */
1121         if (error)
1122                 goto out_child;
1123 
1124         error = -ENOENT;
1125         if (inode->i_nlink == 0)
1126                 goto out_rgrp;
1127 
1128         if (S_ISDIR(inode->i_mode)) {
1129                 error = -ENOTEMPTY;
1130                 if (ip->i_entries > 2 || inode->i_nlink > 2)
1131                         goto out_rgrp;
1132         }
1133 
1134         error = gfs2_glock_nq(ghs + 2); /* rgrp */
1135         if (error)
1136                 goto out_rgrp;
1137 
1138         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1139         if (error)
1140                 goto out_gunlock;
1141 
1142         error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1143         if (error)
1144                 goto out_end_trans;
1145 
1146         error = gfs2_unlink_inode(dip, dentry);
1147 
1148 out_end_trans:
1149         gfs2_trans_end(sdp);
1150 out_gunlock:
1151         gfs2_glock_dq(ghs + 2);
1152 out_rgrp:
1153         gfs2_glock_dq(ghs + 1);
1154 out_child:
1155         gfs2_glock_dq(ghs);
1156 out_parent:
1157         gfs2_holder_uninit(ghs + 2);
1158 out_inodes:
1159         gfs2_holder_uninit(ghs + 1);
1160         gfs2_holder_uninit(ghs);
1161         return error;
1162 }
1163 
1164 /**
1165  * gfs2_symlink - Create a symlink
1166  * @dir: The directory to create the symlink in
1167  * @dentry: The dentry to put the symlink in
1168  * @symname: The thing which the link points to
1169  *
1170  * Returns: errno
1171  */
1172 
1173 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1174                         const char *symname)
1175 {
1176         struct gfs2_sbd *sdp = GFS2_SB(dir);
1177         unsigned int size;
1178 
1179         size = strlen(symname);
1180         if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
1181                 return -ENAMETOOLONG;
1182 
1183         return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0, NULL);
1184 }
1185 
1186 /**
1187  * gfs2_mkdir - Make a directory
1188  * @dir: The parent directory of the new one
1189  * @dentry: The dentry of the new directory
1190  * @mode: The mode of the new directory
1191  *
1192  * Returns: errno
1193  */
1194 
1195 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1196 {
1197         struct gfs2_sbd *sdp = GFS2_SB(dir);
1198         unsigned dsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
1199         return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0, NULL);
1200 }
1201 
1202 /**
1203  * gfs2_mknod - Make a special file
1204  * @dir: The directory in which the special file will reside
1205  * @dentry: The dentry of the special file
1206  * @mode: The mode of the special file
1207  * @dev: The device specification of the special file
1208  *
1209  */
1210 
1211 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1212                       dev_t dev)
1213 {
1214         return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0, NULL);
1215 }
1216 
1217 /**
1218  * gfs2_atomic_open - Atomically open a file
1219  * @dir: The directory
1220  * @dentry: The proposed new entry
1221  * @file: The proposed new struct file
1222  * @flags: open flags
1223  * @mode: File mode
1224  * @opened: Flag to say whether the file has been opened or not
1225  *
1226  * Returns: error code or 0 for success
1227  */
1228 
1229 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1230                             struct file *file, unsigned flags,
1231                             umode_t mode, int *opened)
1232 {
1233         struct dentry *d;
1234         bool excl = !!(flags & O_EXCL);
1235 
1236         if (!d_unhashed(dentry))
1237                 goto skip_lookup;
1238 
1239         d = __gfs2_lookup(dir, dentry, file, opened);
1240         if (IS_ERR(d))
1241                 return PTR_ERR(d);
1242         if (d != NULL)
1243                 dentry = d;
1244         if (d_really_is_positive(dentry)) {
1245                 if (!(*opened & FILE_OPENED))
1246                         return finish_no_open(file, d);
1247                 dput(d);
1248                 return 0;
1249         }
1250 
1251         BUG_ON(d != NULL);
1252 
1253 skip_lookup:
1254         if (!(flags & O_CREAT))
1255                 return -ENOENT;
1256 
1257         return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl, opened);
1258 }
1259 
1260 /*
1261  * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1262  * @this: move this
1263  * @to: to here
1264  *
1265  * Follow @to back to the root and make sure we don't encounter @this
1266  * Assumes we already hold the rename lock.
1267  *
1268  * Returns: errno
1269  */
1270 
1271 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1272 {
1273         struct inode *dir = &to->i_inode;
1274         struct super_block *sb = dir->i_sb;
1275         struct inode *tmp;
1276         int error = 0;
1277 
1278         igrab(dir);
1279 
1280         for (;;) {
1281                 if (dir == &this->i_inode) {
1282                         error = -EINVAL;
1283                         break;
1284                 }
1285                 if (dir == d_inode(sb->s_root)) {
1286                         error = 0;
1287                         break;
1288                 }
1289 
1290                 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1291                 if (!tmp) {
1292                         error = -ENOENT;
1293                         break;
1294                 }
1295                 if (IS_ERR(tmp)) {
1296                         error = PTR_ERR(tmp);
1297                         break;
1298                 }
1299 
1300                 iput(dir);
1301                 dir = tmp;
1302         }
1303 
1304         iput(dir);
1305 
1306         return error;
1307 }
1308 
1309 /**
1310  * update_moved_ino - Update an inode that's being moved
1311  * @ip: The inode being moved
1312  * @ndip: The parent directory of the new filename
1313  * @dir_rename: True of ip is a directory
1314  *
1315  * Returns: errno
1316  */
1317 
1318 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1319                             int dir_rename)
1320 {
1321         int error;
1322         struct buffer_head *dibh;
1323 
1324         if (dir_rename)
1325                 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1326 
1327         error = gfs2_meta_inode_buffer(ip, &dibh);
1328         if (error)
1329                 return error;
1330         ip->i_inode.i_ctime = CURRENT_TIME;
1331         gfs2_trans_add_meta(ip->i_gl, dibh);
1332         gfs2_dinode_out(ip, dibh->b_data);
1333         brelse(dibh);
1334         return 0;
1335 }
1336 
1337 
1338 /**
1339  * gfs2_rename - Rename a file
1340  * @odir: Parent directory of old file name
1341  * @odentry: The old dentry of the file
1342  * @ndir: Parent directory of new file name
1343  * @ndentry: The new dentry of the file
1344  *
1345  * Returns: errno
1346  */
1347 
1348 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1349                        struct inode *ndir, struct dentry *ndentry)
1350 {
1351         struct gfs2_inode *odip = GFS2_I(odir);
1352         struct gfs2_inode *ndip = GFS2_I(ndir);
1353         struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1354         struct gfs2_inode *nip = NULL;
1355         struct gfs2_sbd *sdp = GFS2_SB(odir);
1356         struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1357         struct gfs2_rgrpd *nrgd;
1358         unsigned int num_gh;
1359         int dir_rename = 0;
1360         struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1361         unsigned int x;
1362         int error;
1363 
1364         if (d_really_is_positive(ndentry)) {
1365                 nip = GFS2_I(d_inode(ndentry));
1366                 if (ip == nip)
1367                         return 0;
1368         }
1369 
1370         error = gfs2_rindex_update(sdp);
1371         if (error)
1372                 return error;
1373 
1374         error = gfs2_rs_alloc(ndip);
1375         if (error)
1376                 return error;
1377 
1378         if (odip != ndip) {
1379                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1380                                            0, &r_gh);
1381                 if (error)
1382                         goto out;
1383 
1384                 if (S_ISDIR(ip->i_inode.i_mode)) {
1385                         dir_rename = 1;
1386                         /* don't move a directory into its subdir */
1387                         error = gfs2_ok_to_move(ip, ndip);
1388                         if (error)
1389                                 goto out_gunlock_r;
1390                 }
1391         }
1392 
1393         num_gh = 1;
1394         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1395         if (odip != ndip) {
1396                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1397                 num_gh++;
1398         }
1399         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1400         num_gh++;
1401 
1402         if (nip) {
1403                 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
1404                 num_gh++;
1405                 /* grab the resource lock for unlink flag twiddling 
1406                  * this is the case of the target file already existing
1407                  * so we unlink before doing the rename
1408                  */
1409                 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1410                 if (nrgd)
1411                         gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
1412         }
1413 
1414         for (x = 0; x < num_gh; x++) {
1415                 error = gfs2_glock_nq(ghs + x);
1416                 if (error)
1417                         goto out_gunlock;
1418         }
1419 
1420         error = -ENOENT;
1421         if (ip->i_inode.i_nlink == 0)
1422                 goto out_gunlock;
1423 
1424         /* Check out the old directory */
1425 
1426         error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1427         if (error)
1428                 goto out_gunlock;
1429 
1430         /* Check out the new directory */
1431 
1432         if (nip) {
1433                 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1434                 if (error)
1435                         goto out_gunlock;
1436 
1437                 if (nip->i_inode.i_nlink == 0) {
1438                         error = -EAGAIN;
1439                         goto out_gunlock;
1440                 }
1441 
1442                 if (S_ISDIR(nip->i_inode.i_mode)) {
1443                         if (nip->i_entries < 2) {
1444                                 gfs2_consist_inode(nip);
1445                                 error = -EIO;
1446                                 goto out_gunlock;
1447                         }
1448                         if (nip->i_entries > 2) {
1449                                 error = -ENOTEMPTY;
1450                                 goto out_gunlock;
1451                         }
1452                 }
1453         } else {
1454                 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1455                 if (error)
1456                         goto out_gunlock;
1457 
1458                 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1459                 switch (error) {
1460                 case -ENOENT:
1461                         error = 0;
1462                         break;
1463                 case 0:
1464                         error = -EEXIST;
1465                 default:
1466                         goto out_gunlock;
1467                 };
1468 
1469                 if (odip != ndip) {
1470                         if (!ndip->i_inode.i_nlink) {
1471                                 error = -ENOENT;
1472                                 goto out_gunlock;
1473                         }
1474                         if (ndip->i_entries == (u32)-1) {
1475                                 error = -EFBIG;
1476                                 goto out_gunlock;
1477                         }
1478                         if (S_ISDIR(ip->i_inode.i_mode) &&
1479                             ndip->i_inode.i_nlink == (u32)-1) {
1480                                 error = -EMLINK;
1481                                 goto out_gunlock;
1482                         }
1483                 }
1484         }
1485 
1486         /* Check out the dir to be renamed */
1487 
1488         if (dir_rename) {
1489                 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1490                 if (error)
1491                         goto out_gunlock;
1492         }
1493 
1494         if (nip == NULL) {
1495                 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1496                 if (error)
1497                         goto out_gunlock;
1498         }
1499 
1500         if (da.nr_blocks) {
1501                 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1502                 error = gfs2_quota_lock_check(ndip, &ap);
1503                 if (error)
1504                         goto out_gunlock;
1505 
1506                 error = gfs2_inplace_reserve(ndip, &ap);
1507                 if (error)
1508                         goto out_gunlock_q;
1509 
1510                 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1511                                          4 * RES_LEAF + 4, 0);
1512                 if (error)
1513                         goto out_ipreserv;
1514         } else {
1515                 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1516                                          5 * RES_LEAF + 4, 0);
1517                 if (error)
1518                         goto out_gunlock;
1519         }
1520 
1521         /* Remove the target file, if it exists */
1522 
1523         if (nip)
1524                 error = gfs2_unlink_inode(ndip, ndentry);
1525 
1526         error = update_moved_ino(ip, ndip, dir_rename);
1527         if (error)
1528                 goto out_end_trans;
1529 
1530         error = gfs2_dir_del(odip, odentry);
1531         if (error)
1532                 goto out_end_trans;
1533 
1534         error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1535         if (error)
1536                 goto out_end_trans;
1537 
1538 out_end_trans:
1539         gfs2_trans_end(sdp);
1540 out_ipreserv:
1541         if (da.nr_blocks)
1542                 gfs2_inplace_release(ndip);
1543 out_gunlock_q:
1544         if (da.nr_blocks)
1545                 gfs2_quota_unlock(ndip);
1546 out_gunlock:
1547         gfs2_dir_no_add(&da);
1548         while (x--) {
1549                 gfs2_glock_dq(ghs + x);
1550                 gfs2_holder_uninit(ghs + x);
1551         }
1552 out_gunlock_r:
1553         if (r_gh.gh_gl)
1554                 gfs2_glock_dq_uninit(&r_gh);
1555 out:
1556         return error;
1557 }
1558 
1559 /**
1560  * gfs2_exchange - exchange two files
1561  * @odir: Parent directory of old file name
1562  * @odentry: The old dentry of the file
1563  * @ndir: Parent directory of new file name
1564  * @ndentry: The new dentry of the file
1565  * @flags: The rename flags
1566  *
1567  * Returns: errno
1568  */
1569 
1570 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1571                          struct inode *ndir, struct dentry *ndentry,
1572                          unsigned int flags)
1573 {
1574         struct gfs2_inode *odip = GFS2_I(odir);
1575         struct gfs2_inode *ndip = GFS2_I(ndir);
1576         struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1577         struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1578         struct gfs2_sbd *sdp = GFS2_SB(odir);
1579         struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
1580         unsigned int num_gh;
1581         unsigned int x;
1582         umode_t old_mode = oip->i_inode.i_mode;
1583         umode_t new_mode = nip->i_inode.i_mode;
1584         int error;
1585 
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 (r_gh.gh_gl)
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_follow_link - Follow a symbolic link
1716  * @dentry: The dentry of the link
1717  * @nd: Data that we pass to vfs_follow_link()
1718  *
1719  * This can handle symlinks of any size.
1720  *
1721  * Returns: 0 on success or error code
1722  */
1723 
1724 static const char *gfs2_follow_link(struct dentry *dentry, void **cookie)
1725 {
1726         struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
1727         struct gfs2_holder i_gh;
1728         struct buffer_head *dibh;
1729         unsigned int size;
1730         char *buf;
1731         int error;
1732 
1733         gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1734         error = gfs2_glock_nq(&i_gh);
1735         if (error) {
1736                 gfs2_holder_uninit(&i_gh);
1737                 return ERR_PTR(error);
1738         }
1739 
1740         size = (unsigned int)i_size_read(&ip->i_inode);
1741         if (size == 0) {
1742                 gfs2_consist_inode(ip);
1743                 buf = ERR_PTR(-EIO);
1744                 goto out;
1745         }
1746 
1747         error = gfs2_meta_inode_buffer(ip, &dibh);
1748         if (error) {
1749                 buf = ERR_PTR(error);
1750                 goto out;
1751         }
1752 
1753         buf = kzalloc(size + 1, GFP_NOFS);
1754         if (!buf)
1755                 buf = ERR_PTR(-ENOMEM);
1756         else
1757                 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1758         brelse(dibh);
1759 out:
1760         gfs2_glock_dq_uninit(&i_gh);
1761         if (!IS_ERR(buf))
1762                 *cookie = buf;
1763         return buf;
1764 }
1765 
1766 /**
1767  * gfs2_permission -
1768  * @inode: The inode
1769  * @mask: The mask to be tested
1770  * @flags: Indicates whether this is an RCU path walk or not
1771  *
1772  * This may be called from the VFS directly, or from within GFS2 with the
1773  * inode locked, so we look to see if the glock is already locked and only
1774  * lock the glock if its not already been done.
1775  *
1776  * Returns: errno
1777  */
1778 
1779 int gfs2_permission(struct inode *inode, int mask)
1780 {
1781         struct gfs2_inode *ip;
1782         struct gfs2_holder i_gh;
1783         int error;
1784         int unlock = 0;
1785 
1786 
1787         ip = GFS2_I(inode);
1788         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1789                 if (mask & MAY_NOT_BLOCK)
1790                         return -ECHILD;
1791                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1792                 if (error)
1793                         return error;
1794                 unlock = 1;
1795         }
1796 
1797         if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1798                 error = -EACCES;
1799         else
1800                 error = generic_permission(inode, mask);
1801         if (unlock)
1802                 gfs2_glock_dq_uninit(&i_gh);
1803 
1804         return error;
1805 }
1806 
1807 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1808 {
1809         setattr_copy(inode, attr);
1810         mark_inode_dirty(inode);
1811         return 0;
1812 }
1813 
1814 /**
1815  * gfs2_setattr_simple -
1816  * @ip:
1817  * @attr:
1818  *
1819  * Returns: errno
1820  */
1821 
1822 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1823 {
1824         int error;
1825 
1826         if (current->journal_info)
1827                 return __gfs2_setattr_simple(inode, attr);
1828 
1829         error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1830         if (error)
1831                 return error;
1832 
1833         error = __gfs2_setattr_simple(inode, attr);
1834         gfs2_trans_end(GFS2_SB(inode));
1835         return error;
1836 }
1837 
1838 static int setattr_chown(struct inode *inode, struct iattr *attr)
1839 {
1840         struct gfs2_inode *ip = GFS2_I(inode);
1841         struct gfs2_sbd *sdp = GFS2_SB(inode);
1842         kuid_t ouid, nuid;
1843         kgid_t ogid, ngid;
1844         int error;
1845         struct gfs2_alloc_parms ap;
1846 
1847         ouid = inode->i_uid;
1848         ogid = inode->i_gid;
1849         nuid = attr->ia_uid;
1850         ngid = attr->ia_gid;
1851 
1852         if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1853                 ouid = nuid = NO_UID_QUOTA_CHANGE;
1854         if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1855                 ogid = ngid = NO_GID_QUOTA_CHANGE;
1856 
1857         error = get_write_access(inode);
1858         if (error)
1859                 return error;
1860 
1861         error = gfs2_rs_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         put_write_access(inode);
1902         return error;
1903 }
1904 
1905 /**
1906  * gfs2_setattr - Change attributes on an inode
1907  * @dentry: The dentry which is changing
1908  * @attr: The structure describing the change
1909  *
1910  * The VFS layer wants to change one or more of an inodes attributes.  Write
1911  * that change out to disk.
1912  *
1913  * Returns: errno
1914  */
1915 
1916 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1917 {
1918         struct inode *inode = d_inode(dentry);
1919         struct gfs2_inode *ip = GFS2_I(inode);
1920         struct gfs2_holder i_gh;
1921         int error;
1922 
1923         error = gfs2_rs_alloc(ip);
1924         if (error)
1925                 return error;
1926 
1927         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1928         if (error)
1929                 return error;
1930 
1931         error = -EPERM;
1932         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1933                 goto out;
1934 
1935         error = inode_change_ok(inode, attr);
1936         if (error)
1937                 goto out;
1938 
1939         if (attr->ia_valid & ATTR_SIZE)
1940                 error = gfs2_setattr_size(inode, attr->ia_size);
1941         else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1942                 error = setattr_chown(inode, attr);
1943         else {
1944                 error = gfs2_setattr_simple(inode, attr);
1945                 if (!error && attr->ia_valid & ATTR_MODE)
1946                         error = posix_acl_chmod(inode, inode->i_mode);
1947         }
1948 
1949 out:
1950         if (!error)
1951                 mark_inode_dirty(inode);
1952         gfs2_glock_dq_uninit(&i_gh);
1953         return error;
1954 }
1955 
1956 /**
1957  * gfs2_getattr - Read out an inode's attributes
1958  * @mnt: The vfsmount the inode is being accessed from
1959  * @dentry: The dentry to stat
1960  * @stat: The inode's stats
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(struct vfsmount *mnt, struct dentry *dentry,
1972                         struct kstat *stat)
1973 {
1974         struct inode *inode = d_inode(dentry);
1975         struct gfs2_inode *ip = GFS2_I(inode);
1976         struct gfs2_holder gh;
1977         int error;
1978         int unlock = 0;
1979 
1980         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1981                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1982                 if (error)
1983                         return error;
1984                 unlock = 1;
1985         }
1986 
1987         generic_fillattr(inode, stat);
1988         if (unlock)
1989                 gfs2_glock_dq_uninit(&gh);
1990 
1991         return 0;
1992 }
1993 
1994 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1995                          const void *data, size_t size, int flags)
1996 {
1997         struct inode *inode = d_inode(dentry);
1998         struct gfs2_inode *ip = GFS2_I(inode);
1999         struct gfs2_holder gh;
2000         int ret;
2001 
2002         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
2003         ret = gfs2_glock_nq(&gh);
2004         if (ret == 0) {
2005                 ret = gfs2_rs_alloc(ip);
2006                 if (ret == 0)
2007                         ret = generic_setxattr(dentry, name, data, size, flags);
2008                 gfs2_glock_dq(&gh);
2009         }
2010         gfs2_holder_uninit(&gh);
2011         return ret;
2012 }
2013 
2014 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
2015                              void *data, size_t size)
2016 {
2017         struct inode *inode = d_inode(dentry);
2018         struct gfs2_inode *ip = GFS2_I(inode);
2019         struct gfs2_holder gh;
2020         int ret;
2021 
2022         /* For selinux during lookup */
2023         if (gfs2_glock_is_locked_by_me(ip->i_gl))
2024                 return generic_getxattr(dentry, name, data, size);
2025 
2026         gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2027         ret = gfs2_glock_nq(&gh);
2028         if (ret == 0) {
2029                 ret = generic_getxattr(dentry, name, data, size);
2030                 gfs2_glock_dq(&gh);
2031         }
2032         gfs2_holder_uninit(&gh);
2033         return ret;
2034 }
2035 
2036 static int gfs2_removexattr(struct dentry *dentry, const char *name)
2037 {
2038         struct inode *inode = d_inode(dentry);
2039         struct gfs2_inode *ip = GFS2_I(inode);
2040         struct gfs2_holder gh;
2041         int ret;
2042 
2043         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
2044         ret = gfs2_glock_nq(&gh);
2045         if (ret == 0) {
2046                 ret = gfs2_rs_alloc(ip);
2047                 if (ret == 0)
2048                         ret = generic_removexattr(dentry, name);
2049                 gfs2_glock_dq(&gh);
2050         }
2051         gfs2_holder_uninit(&gh);
2052         return ret;
2053 }
2054 
2055 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2056                        u64 start, u64 len)
2057 {
2058         struct gfs2_inode *ip = GFS2_I(inode);
2059         struct gfs2_holder gh;
2060         int ret;
2061 
2062         ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
2063         if (ret)
2064                 return ret;
2065 
2066         mutex_lock(&inode->i_mutex);
2067 
2068         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2069         if (ret)
2070                 goto out;
2071 
2072         if (gfs2_is_stuffed(ip)) {
2073                 u64 phys = ip->i_no_addr << inode->i_blkbits;
2074                 u64 size = i_size_read(inode);
2075                 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
2076                             FIEMAP_EXTENT_DATA_INLINE;
2077                 phys += sizeof(struct gfs2_dinode);
2078                 phys += start;
2079                 if (start + len > size)
2080                         len = size - start;
2081                 if (start < size)
2082                         ret = fiemap_fill_next_extent(fieinfo, start, phys,
2083                                                       len, flags);
2084                 if (ret == 1)
2085                         ret = 0;
2086         } else {
2087                 ret = __generic_block_fiemap(inode, fieinfo, start, len,
2088                                              gfs2_block_map);
2089         }
2090 
2091         gfs2_glock_dq_uninit(&gh);
2092 out:
2093         mutex_unlock(&inode->i_mutex);
2094         return ret;
2095 }
2096 
2097 const struct inode_operations gfs2_file_iops = {
2098         .permission = gfs2_permission,
2099         .setattr = gfs2_setattr,
2100         .getattr = gfs2_getattr,
2101         .setxattr = gfs2_setxattr,
2102         .getxattr = gfs2_getxattr,
2103         .listxattr = gfs2_listxattr,
2104         .removexattr = gfs2_removexattr,
2105         .fiemap = gfs2_fiemap,
2106         .get_acl = gfs2_get_acl,
2107         .set_acl = gfs2_set_acl,
2108 };
2109 
2110 const struct inode_operations gfs2_dir_iops = {
2111         .create = gfs2_create,
2112         .lookup = gfs2_lookup,
2113         .link = gfs2_link,
2114         .unlink = gfs2_unlink,
2115         .symlink = gfs2_symlink,
2116         .mkdir = gfs2_mkdir,
2117         .rmdir = gfs2_unlink,
2118         .mknod = gfs2_mknod,
2119         .rename2 = gfs2_rename2,
2120         .permission = gfs2_permission,
2121         .setattr = gfs2_setattr,
2122         .getattr = gfs2_getattr,
2123         .setxattr = gfs2_setxattr,
2124         .getxattr = gfs2_getxattr,
2125         .listxattr = gfs2_listxattr,
2126         .removexattr = gfs2_removexattr,
2127         .fiemap = gfs2_fiemap,
2128         .get_acl = gfs2_get_acl,
2129         .set_acl = gfs2_set_acl,
2130         .atomic_open = gfs2_atomic_open,
2131 };
2132 
2133 const struct inode_operations gfs2_symlink_iops = {
2134         .readlink = generic_readlink,
2135         .follow_link = gfs2_follow_link,
2136         .put_link = kfree_put_link,
2137         .permission = gfs2_permission,
2138         .setattr = gfs2_setattr,
2139         .getattr = gfs2_getattr,
2140         .setxattr = gfs2_setxattr,
2141         .getxattr = gfs2_getxattr,
2142         .listxattr = gfs2_listxattr,
2143         .removexattr = gfs2_removexattr,
2144         .fiemap = gfs2_fiemap,
2145 };
2146 
2147 

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