fs/gfs2/inode.c

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This source file includes following definitions.
iget_test
iget_set
gfs2_iget
gfs2_set_iop
gfs2_inode_lookup
gfs2_lookup_by_inum
gfs2_lookup_simple
gfs2_lookupi
create_ok
munge_mode_uid_gid
alloc_dinode
gfs2_init_dir
gfs2_init_xattr
init_dinode
gfs2_trans_da_blks
link_dinode
gfs2_initxattrs
gfs2_create_inode
gfs2_create
__gfs2_lookup
gfs2_lookup
gfs2_link
gfs2_unlink_ok
gfs2_unlink_inode
gfs2_unlink
gfs2_symlink
gfs2_mkdir
gfs2_mknod
gfs2_atomic_open
gfs2_ok_to_move
update_moved_ino
gfs2_rename
gfs2_exchange
gfs2_rename2
gfs2_get_link
gfs2_permission
__gfs2_setattr_simple
gfs2_setattr_simple
setattr_chown
gfs2_setattr
gfs2_getattr
gfs2_fiemap
gfs2_seek_data
gfs2_seek_hole
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   4  * Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
   5  */
   6 
   7 #include <linux/slab.h>
   8 #include <linux/spinlock.h>
   9 #include <linux/completion.h>
  10 #include <linux/buffer_head.h>
  11 #include <linux/namei.h>
  12 #include <linux/mm.h>
  13 #include <linux/cred.h>
  14 #include <linux/xattr.h>
  15 #include <linux/posix_acl.h>
  16 #include <linux/gfs2_ondisk.h>
  17 #include <linux/crc32.h>
  18 #include <linux/iomap.h>
  19 #include <linux/security.h>
  20 #include <linux/uaccess.h>
  21 
  22 #include "gfs2.h"
  23 #include "incore.h"
  24 #include "acl.h"
  25 #include "bmap.h"
  26 #include "dir.h"
  27 #include "xattr.h"
  28 #include "glock.h"
  29 #include "inode.h"
  30 #include "meta_io.h"
  31 #include "quota.h"
  32 #include "rgrp.h"
  33 #include "trans.h"
  34 #include "util.h"
  35 #include "super.h"
  36 #include "glops.h"
  37 
  38 static int iget_test(struct inode *inode, void *opaque)
  39 {
  40         u64 no_addr = *(u64 *)opaque;
  41 
  42         return GFS2_I(inode)->i_no_addr == no_addr;
  43 }
  44 
  45 static int iget_set(struct inode *inode, void *opaque)
  46 {
  47         u64 no_addr = *(u64 *)opaque;
  48 
  49         GFS2_I(inode)->i_no_addr = no_addr;
  50         inode->i_ino = no_addr;
  51         return 0;
  52 }
  53 
  54 static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
  55 {
  56         struct inode *inode;
  57 
  58 repeat:
  59         inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
  60         if (!inode)
  61                 return inode;
  62         if (is_bad_inode(inode)) {
  63                 iput(inode);
  64                 goto repeat;
  65         }
  66         return inode;
  67 }
  68 
  69 /**
  70  * gfs2_set_iop - Sets inode operations
  71  * @inode: The inode with correct i_mode filled in
  72  *
  73  * GFS2 lookup code fills in vfs inode contents based on info obtained
  74  * from directory entry inside gfs2_inode_lookup().
  75  */
  76 
  77 static void gfs2_set_iop(struct inode *inode)
  78 {
  79         struct gfs2_sbd *sdp = GFS2_SB(inode);
  80         umode_t mode = inode->i_mode;
  81 
  82         if (S_ISREG(mode)) {
  83                 inode->i_op = &gfs2_file_iops;
  84                 if (gfs2_localflocks(sdp))
  85                         inode->i_fop = &gfs2_file_fops_nolock;
  86                 else
  87                         inode->i_fop = &gfs2_file_fops;
  88         } else if (S_ISDIR(mode)) {
  89                 inode->i_op = &gfs2_dir_iops;
  90                 if (gfs2_localflocks(sdp))
  91                         inode->i_fop = &gfs2_dir_fops_nolock;
  92                 else
  93                         inode->i_fop = &gfs2_dir_fops;
  94         } else if (S_ISLNK(mode)) {
  95                 inode->i_op = &gfs2_symlink_iops;
  96         } else {
  97                 inode->i_op = &gfs2_file_iops;
  98                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
  99         }
 100 }
 101 
 102 /**
 103  * gfs2_inode_lookup - Lookup an inode
 104  * @sb: The super block
 105  * @type: The type of the inode
 106  * @no_addr: The inode number
 107  * @no_formal_ino: The inode generation number
 108  * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
 109  *           GFS2_BLKST_FREE to indicate not to verify)
 110  *
 111  * If @type is DT_UNKNOWN, the inode type is fetched from disk.
 112  *
 113  * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
 114  * placeholder because it doesn't otherwise make sense), the on-disk block type
 115  * is verified to be @blktype.
 116  *
 117  * Returns: A VFS inode, or an error
 118  */
 119 
 120 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
 121                                 u64 no_addr, u64 no_formal_ino,
 122                                 unsigned int blktype)
 123 {
 124         struct inode *inode;
 125         struct gfs2_inode *ip;
 126         struct gfs2_glock *io_gl = NULL;
 127         struct gfs2_holder i_gh;
 128         int error;
 129 
 130         gfs2_holder_mark_uninitialized(&i_gh);
 131         inode = gfs2_iget(sb, no_addr);
 132         if (!inode)
 133                 return ERR_PTR(-ENOMEM);
 134 
 135         ip = GFS2_I(inode);
 136 
 137         if (inode->i_state & I_NEW) {
 138                 struct gfs2_sbd *sdp = GFS2_SB(inode);
 139                 ip->i_no_formal_ino = no_formal_ino;
 140 
 141                 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
 142                 if (unlikely(error))
 143                         goto fail;
 144                 flush_delayed_work(&ip->i_gl->gl_work);
 145 
 146                 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
 147                 if (unlikely(error))
 148                         goto fail_put;
 149 
 150                 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
 151                         /*
 152                          * The GL_SKIP flag indicates to skip reading the inode
 153                          * block.  We read the inode with gfs2_inode_refresh
 154                          * after possibly checking the block type.
 155                          */
 156                         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
 157                                                    GL_SKIP, &i_gh);
 158                         if (error)
 159                                 goto fail_put;
 160 
 161                         if (blktype != GFS2_BLKST_FREE) {
 162                                 error = gfs2_check_blk_type(sdp, no_addr,
 163                                                             blktype);
 164                                 if (error)
 165                                         goto fail_put;
 166                         }
 167                 }
 168 
 169                 glock_set_object(ip->i_gl, ip);
 170                 set_bit(GIF_INVALID, &ip->i_flags);
 171                 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
 172                 if (unlikely(error))
 173                         goto fail_put;
 174                 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
 175                 gfs2_glock_put(io_gl);
 176                 io_gl = NULL;
 177 
 178                 if (type == DT_UNKNOWN) {
 179                         /* Inode glock must be locked already */
 180                         error = gfs2_inode_refresh(GFS2_I(inode));
 181                         if (error)
 182                                 goto fail_refresh;
 183                 } else {
 184                         inode->i_mode = DT2IF(type);
 185                 }
 186 
 187                 gfs2_set_iop(inode);
 188 
 189                 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
 190                 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
 191                 inode->i_atime.tv_nsec = 0;
 192 
 193                 unlock_new_inode(inode);
 194         }
 195 
 196         if (gfs2_holder_initialized(&i_gh))
 197                 gfs2_glock_dq_uninit(&i_gh);
 198         return inode;
 199 
 200 fail_refresh:
 201         ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
 202         glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
 203         gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 204 fail_put:
 205         if (io_gl)
 206                 gfs2_glock_put(io_gl);
 207         glock_clear_object(ip->i_gl, ip);
 208         if (gfs2_holder_initialized(&i_gh))
 209                 gfs2_glock_dq_uninit(&i_gh);
 210 fail:
 211         iget_failed(inode);
 212         return ERR_PTR(error);
 213 }
 214 
 215 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
 216                                   u64 *no_formal_ino, unsigned int blktype)
 217 {
 218         struct super_block *sb = sdp->sd_vfs;
 219         struct inode *inode;
 220         int error;
 221 
 222         inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, blktype);
 223         if (IS_ERR(inode))
 224                 return inode;
 225 
 226         /* Two extra checks for NFS only */
 227         if (no_formal_ino) {
 228                 error = -ESTALE;
 229                 if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino)
 230                         goto fail_iput;
 231 
 232                 error = -EIO;
 233                 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
 234                         goto fail_iput;
 235         }
 236         return inode;
 237 
 238 fail_iput:
 239         iput(inode);
 240         return ERR_PTR(error);
 241 }
 242 
 243 
 244 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
 245 {
 246         struct qstr qstr;
 247         struct inode *inode;
 248         gfs2_str2qstr(&qstr, name);
 249         inode = gfs2_lookupi(dip, &qstr, 1);
 250         /* gfs2_lookupi has inconsistent callers: vfs
 251          * related routines expect NULL for no entry found,
 252          * gfs2_lookup_simple callers expect ENOENT
 253          * and do not check for NULL.
 254          */
 255         if (inode == NULL)
 256                 return ERR_PTR(-ENOENT);
 257         else
 258                 return inode;
 259 }
 260 
 261 
 262 /**
 263  * gfs2_lookupi - Look up a filename in a directory and return its inode
 264  * @d_gh: An initialized holder for the directory glock
 265  * @name: The name of the inode to look for
 266  * @is_root: If 1, ignore the caller's permissions
 267  * @i_gh: An uninitialized holder for the new inode glock
 268  *
 269  * This can be called via the VFS filldir function when NFS is doing
 270  * a readdirplus and the inode which its intending to stat isn't
 271  * already in cache. In this case we must not take the directory glock
 272  * again, since the readdir call will have already taken that lock.
 273  *
 274  * Returns: errno
 275  */
 276 
 277 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
 278                            int is_root)
 279 {
 280         struct super_block *sb = dir->i_sb;
 281         struct gfs2_inode *dip = GFS2_I(dir);
 282         struct gfs2_holder d_gh;
 283         int error = 0;
 284         struct inode *inode = NULL;
 285 
 286         gfs2_holder_mark_uninitialized(&d_gh);
 287         if (!name->len || name->len > GFS2_FNAMESIZE)
 288                 return ERR_PTR(-ENAMETOOLONG);
 289 
 290         if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
 291             (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
 292              dir == d_inode(sb->s_root))) {
 293                 igrab(dir);
 294                 return dir;
 295         }
 296 
 297         if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
 298                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
 299                 if (error)
 300                         return ERR_PTR(error);
 301         }
 302 
 303         if (!is_root) {
 304                 error = gfs2_permission(dir, MAY_EXEC);
 305                 if (error)
 306                         goto out;
 307         }
 308 
 309         inode = gfs2_dir_search(dir, name, false);
 310         if (IS_ERR(inode))
 311                 error = PTR_ERR(inode);
 312 out:
 313         if (gfs2_holder_initialized(&d_gh))
 314                 gfs2_glock_dq_uninit(&d_gh);
 315         if (error == -ENOENT)
 316                 return NULL;
 317         return inode ? inode : ERR_PTR(error);
 318 }
 319 
 320 /**
 321  * create_ok - OK to create a new on-disk inode here?
 322  * @dip:  Directory in which dinode is to be created
 323  * @name:  Name of new dinode
 324  * @mode:
 325  *
 326  * Returns: errno
 327  */
 328 
 329 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
 330                      umode_t mode)
 331 {
 332         int error;
 333 
 334         error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
 335         if (error)
 336                 return error;
 337 
 338         /*  Don't create entries in an unlinked directory  */
 339         if (!dip->i_inode.i_nlink)
 340                 return -ENOENT;
 341 
 342         if (dip->i_entries == (u32)-1)
 343                 return -EFBIG;
 344         if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
 345                 return -EMLINK;
 346 
 347         return 0;
 348 }
 349 
 350 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
 351                                struct inode *inode)
 352 {
 353         if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
 354             (dip->i_inode.i_mode & S_ISUID) &&
 355             !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
 356                 if (S_ISDIR(inode->i_mode))
 357                         inode->i_mode |= S_ISUID;
 358                 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
 359                         inode->i_mode &= ~07111;
 360                 inode->i_uid = dip->i_inode.i_uid;
 361         } else
 362                 inode->i_uid = current_fsuid();
 363 
 364         if (dip->i_inode.i_mode & S_ISGID) {
 365                 if (S_ISDIR(inode->i_mode))
 366                         inode->i_mode |= S_ISGID;
 367                 inode->i_gid = dip->i_inode.i_gid;
 368         } else
 369                 inode->i_gid = current_fsgid();
 370 }
 371 
 372 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
 373 {
 374         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 375         struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
 376         int error;
 377 
 378         error = gfs2_quota_lock_check(ip, &ap);
 379         if (error)
 380                 goto out;
 381 
 382         error = gfs2_inplace_reserve(ip, &ap);
 383         if (error)
 384                 goto out_quota;
 385 
 386         error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
 387         if (error)
 388                 goto out_ipreserv;
 389 
 390         error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
 391         ip->i_no_formal_ino = ip->i_generation;
 392         ip->i_inode.i_ino = ip->i_no_addr;
 393         ip->i_goal = ip->i_no_addr;
 394 
 395         gfs2_trans_end(sdp);
 396 
 397 out_ipreserv:
 398         gfs2_inplace_release(ip);
 399 out_quota:
 400         gfs2_quota_unlock(ip);
 401 out:
 402         return error;
 403 }
 404 
 405 static void gfs2_init_dir(struct buffer_head *dibh,
 406                           const struct gfs2_inode *parent)
 407 {
 408         struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
 409         struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
 410 
 411         gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
 412         dent->de_inum = di->di_num; /* already GFS2 endian */
 413         dent->de_type = cpu_to_be16(DT_DIR);
 414 
 415         dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
 416         gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
 417         gfs2_inum_out(parent, dent);
 418         dent->de_type = cpu_to_be16(DT_DIR);
 419         
 420 }
 421 
 422 /**
 423  * gfs2_init_xattr - Initialise an xattr block for a new inode
 424  * @ip: The inode in question
 425  *
 426  * This sets up an empty xattr block for a new inode, ready to
 427  * take any ACLs, LSM xattrs, etc.
 428  */
 429 
 430 static void gfs2_init_xattr(struct gfs2_inode *ip)
 431 {
 432         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 433         struct buffer_head *bh;
 434         struct gfs2_ea_header *ea;
 435 
 436         bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
 437         gfs2_trans_add_meta(ip->i_gl, bh);
 438         gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 439         gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
 440 
 441         ea = GFS2_EA_BH2FIRST(bh);
 442         ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 443         ea->ea_type = GFS2_EATYPE_UNUSED;
 444         ea->ea_flags = GFS2_EAFLAG_LAST;
 445 
 446         brelse(bh);
 447 }
 448 
 449 /**
 450  * init_dinode - Fill in a new dinode structure
 451  * @dip: The directory this inode is being created in
 452  * @ip: The inode
 453  * @symname: The symlink destination (if a symlink)
 454  * @bhp: The buffer head (returned to caller)
 455  *
 456  */
 457 
 458 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
 459                         const char *symname)
 460 {
 461         struct gfs2_dinode *di;
 462         struct buffer_head *dibh;
 463 
 464         dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
 465         gfs2_trans_add_meta(ip->i_gl, dibh);
 466         di = (struct gfs2_dinode *)dibh->b_data;
 467         gfs2_dinode_out(ip, di);
 468 
 469         di->di_major = cpu_to_be32(MAJOR(ip->i_inode.i_rdev));
 470         di->di_minor = cpu_to_be32(MINOR(ip->i_inode.i_rdev));
 471         di->__pad1 = 0;
 472         di->__pad2 = 0;
 473         di->__pad3 = 0;
 474         memset(&di->__pad4, 0, sizeof(di->__pad4));
 475         memset(&di->di_reserved, 0, sizeof(di->di_reserved));
 476         gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
 477 
 478         switch(ip->i_inode.i_mode & S_IFMT) {
 479         case S_IFDIR:
 480                 gfs2_init_dir(dibh, dip);
 481                 break;
 482         case S_IFLNK:
 483                 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
 484                 break;
 485         }
 486 
 487         set_buffer_uptodate(dibh);
 488         brelse(dibh);
 489 }
 490 
 491 /**
 492  * gfs2_trans_da_blocks - Calculate number of blocks to link inode
 493  * @dip: The directory we are linking into
 494  * @da: The dir add information
 495  * @nr_inodes: The number of inodes involved
 496  *
 497  * This calculate the number of blocks we need to reserve in a
 498  * transaction to link @nr_inodes into a directory. In most cases
 499  * @nr_inodes will be 2 (the directory plus the inode being linked in)
 500  * but in case of rename, 4 may be required.
 501  *
 502  * Returns: Number of blocks
 503  */
 504 
 505 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
 506                                    const struct gfs2_diradd *da,
 507                                    unsigned nr_inodes)
 508 {
 509         return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
 510                (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
 511 }
 512 
 513 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
 514                        struct gfs2_inode *ip, struct gfs2_diradd *da)
 515 {
 516         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
 517         struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
 518         int error;
 519 
 520         if (da->nr_blocks) {
 521                 error = gfs2_quota_lock_check(dip, &ap);
 522                 if (error)
 523                         goto fail_quota_locks;
 524 
 525                 error = gfs2_inplace_reserve(dip, &ap);
 526                 if (error)
 527                         goto fail_quota_locks;
 528 
 529                 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
 530                 if (error)
 531                         goto fail_ipreserv;
 532         } else {
 533                 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
 534                 if (error)
 535                         goto fail_quota_locks;
 536         }
 537 
 538         error = gfs2_dir_add(&dip->i_inode, name, ip, da);
 539 
 540         gfs2_trans_end(sdp);
 541 fail_ipreserv:
 542         gfs2_inplace_release(dip);
 543 fail_quota_locks:
 544         gfs2_quota_unlock(dip);
 545         return error;
 546 }
 547 
 548 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
 549                     void *fs_info)
 550 {
 551         const struct xattr *xattr;
 552         int err = 0;
 553 
 554         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
 555                 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
 556                                        xattr->value_len, 0,
 557                                        GFS2_EATYPE_SECURITY);
 558                 if (err < 0)
 559                         break;
 560         }
 561         return err;
 562 }
 563 
 564 /**
 565  * gfs2_create_inode - Create a new inode
 566  * @dir: The parent directory
 567  * @dentry: The new dentry
 568  * @file: If non-NULL, the file which is being opened
 569  * @mode: The permissions on the new inode
 570  * @dev: For device nodes, this is the device number
 571  * @symname: For symlinks, this is the link destination
 572  * @size: The initial size of the inode (ignored for directories)
 573  *
 574  * Returns: 0 on success, or error code
 575  */
 576 
 577 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
 578                              struct file *file,
 579                              umode_t mode, dev_t dev, const char *symname,
 580                              unsigned int size, int excl)
 581 {
 582         const struct qstr *name = &dentry->d_name;
 583         struct posix_acl *default_acl, *acl;
 584         struct gfs2_holder ghs[2];
 585         struct inode *inode = NULL;
 586         struct gfs2_inode *dip = GFS2_I(dir), *ip;
 587         struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
 588         struct gfs2_glock *io_gl = NULL;
 589         int error, free_vfs_inode = 1;
 590         u32 aflags = 0;
 591         unsigned blocks = 1;
 592         struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
 593 
 594         if (!name->len || name->len > GFS2_FNAMESIZE)
 595                 return -ENAMETOOLONG;
 596 
 597         error = gfs2_rsqa_alloc(dip);
 598         if (error)
 599                 return error;
 600 
 601         error = gfs2_rindex_update(sdp);
 602         if (error)
 603                 return error;
 604 
 605         error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 606         if (error)
 607                 goto fail;
 608         gfs2_holder_mark_uninitialized(ghs + 1);
 609 
 610         error = create_ok(dip, name, mode);
 611         if (error)
 612                 goto fail_gunlock;
 613 
 614         inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
 615         error = PTR_ERR(inode);
 616         if (!IS_ERR(inode)) {
 617                 if (S_ISDIR(inode->i_mode)) {
 618                         iput(inode);
 619                         inode = ERR_PTR(-EISDIR);
 620                         goto fail_gunlock;
 621                 }
 622                 d_instantiate(dentry, inode);
 623                 error = 0;
 624                 if (file) {
 625                         if (S_ISREG(inode->i_mode))
 626                                 error = finish_open(file, dentry, gfs2_open_common);
 627                         else
 628                                 error = finish_no_open(file, NULL);
 629                 }
 630                 gfs2_glock_dq_uninit(ghs);
 631                 return error;
 632         } else if (error != -ENOENT) {
 633                 goto fail_gunlock;
 634         }
 635 
 636         error = gfs2_diradd_alloc_required(dir, name, &da);
 637         if (error < 0)
 638                 goto fail_gunlock;
 639 
 640         inode = new_inode(sdp->sd_vfs);
 641         error = -ENOMEM;
 642         if (!inode)
 643                 goto fail_gunlock;
 644 
 645         error = posix_acl_create(dir, &mode, &default_acl, &acl);
 646         if (error)
 647                 goto fail_gunlock;
 648 
 649         ip = GFS2_I(inode);
 650         error = gfs2_rsqa_alloc(ip);
 651         if (error)
 652                 goto fail_free_acls;
 653 
 654         inode->i_mode = mode;
 655         set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
 656         inode->i_rdev = dev;
 657         inode->i_size = size;
 658         inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
 659         gfs2_set_inode_blocks(inode, 1);
 660         munge_mode_uid_gid(dip, inode);
 661         check_and_update_goal(dip);
 662         ip->i_goal = dip->i_goal;
 663         ip->i_diskflags = 0;
 664         ip->i_eattr = 0;
 665         ip->i_height = 0;
 666         ip->i_depth = 0;
 667         ip->i_entries = 0;
 668         ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
 669 
 670         switch(mode & S_IFMT) {
 671         case S_IFREG:
 672                 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
 673                     gfs2_tune_get(sdp, gt_new_files_jdata))
 674                         ip->i_diskflags |= GFS2_DIF_JDATA;
 675                 gfs2_set_aops(inode);
 676                 break;
 677         case S_IFDIR:
 678                 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
 679                 ip->i_diskflags |= GFS2_DIF_JDATA;
 680                 ip->i_entries = 2;
 681                 break;
 682         }
 683 
 684         /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
 685         if (dip->i_diskflags & GFS2_DIF_SYSTEM)
 686                 ip->i_diskflags |= GFS2_DIF_SYSTEM;
 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         flush_delayed_work(&ip->i_gl->gl_work);
 707         glock_set_object(ip->i_gl, ip);
 708 
 709         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1);
 710         if (error)
 711                 goto fail_free_inode;
 712 
 713         error = gfs2_trans_begin(sdp, blocks, 0);
 714         if (error)
 715                 goto fail_gunlock2;
 716 
 717         if (blocks > 1) {
 718                 ip->i_eattr = ip->i_no_addr + 1;
 719                 gfs2_init_xattr(ip);
 720         }
 721         init_dinode(dip, ip, symname);
 722         gfs2_trans_end(sdp);
 723 
 724         error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
 725         if (error)
 726                 goto fail_gunlock2;
 727 
 728         BUG_ON(test_and_set_bit(GLF_INODE_CREATING, &io_gl->gl_flags));
 729 
 730         error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh);
 731         if (error)
 732                 goto fail_gunlock2;
 733 
 734         glock_set_object(ip->i_iopen_gh.gh_gl, ip);
 735         gfs2_glock_put(io_gl);
 736         gfs2_set_iop(inode);
 737         insert_inode_hash(inode);
 738 
 739         free_vfs_inode = 0; /* After this point, the inode is no longer
 740                                considered free. Any failures need to undo
 741                                the gfs2 structures. */
 742         if (default_acl) {
 743                 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
 744                 if (error)
 745                         goto fail_gunlock3;
 746                 posix_acl_release(default_acl);
 747                 default_acl = NULL;
 748         }
 749         if (acl) {
 750                 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
 751                 if (error)
 752                         goto fail_gunlock3;
 753                 posix_acl_release(acl);
 754                 acl = NULL;
 755         }
 756 
 757         error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
 758                                              &gfs2_initxattrs, NULL);
 759         if (error)
 760                 goto fail_gunlock3;
 761 
 762         error = link_dinode(dip, name, ip, &da);
 763         if (error)
 764                 goto fail_gunlock3;
 765 
 766         mark_inode_dirty(inode);
 767         d_instantiate(dentry, inode);
 768         if (file) {
 769                 file->f_mode |= FMODE_CREATED;
 770                 error = finish_open(file, dentry, gfs2_open_common);
 771         }
 772         gfs2_glock_dq_uninit(ghs);
 773         gfs2_glock_dq_uninit(ghs + 1);
 774         clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
 775         return error;
 776 
 777 fail_gunlock3:
 778         glock_clear_object(io_gl, ip);
 779         gfs2_glock_dq_uninit(&ip->i_iopen_gh);
 780         gfs2_glock_put(io_gl);
 781 fail_gunlock2:
 782         if (io_gl)
 783                 clear_bit(GLF_INODE_CREATING, &io_gl->gl_flags);
 784 fail_free_inode:
 785         if (ip->i_gl) {
 786                 glock_clear_object(ip->i_gl, ip);
 787                 gfs2_glock_put(ip->i_gl);
 788         }
 789         gfs2_rsqa_delete(ip, NULL);
 790 fail_free_acls:
 791         posix_acl_release(default_acl);
 792         posix_acl_release(acl);
 793 fail_gunlock:
 794         gfs2_dir_no_add(&da);
 795         gfs2_glock_dq_uninit(ghs);
 796         if (!IS_ERR_OR_NULL(inode)) {
 797                 clear_nlink(inode);
 798                 if (!free_vfs_inode)
 799                         mark_inode_dirty(inode);
 800                 set_bit(free_vfs_inode ? GIF_FREE_VFS_INODE : GIF_ALLOC_FAILED,
 801                         &GFS2_I(inode)->i_flags);
 802                 iput(inode);
 803         }
 804         if (gfs2_holder_initialized(ghs + 1))
 805                 gfs2_glock_dq_uninit(ghs + 1);
 806 fail:
 807         return error;
 808 }
 809 
 810 /**
 811  * gfs2_create - Create a file
 812  * @dir: The directory in which to create the file
 813  * @dentry: The dentry of the new file
 814  * @mode: The mode of the new file
 815  *
 816  * Returns: errno
 817  */
 818 
 819 static int gfs2_create(struct inode *dir, struct dentry *dentry,
 820                        umode_t mode, bool excl)
 821 {
 822         return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
 823 }
 824 
 825 /**
 826  * __gfs2_lookup - Look up a filename in a directory and return its inode
 827  * @dir: The directory inode
 828  * @dentry: The dentry of the new inode
 829  * @file: File to be opened
 830  *
 831  *
 832  * Returns: errno
 833  */
 834 
 835 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
 836                                     struct file *file)
 837 {
 838         struct inode *inode;
 839         struct dentry *d;
 840         struct gfs2_holder gh;
 841         struct gfs2_glock *gl;
 842         int error;
 843 
 844         inode = gfs2_lookupi(dir, &dentry->d_name, 0);
 845         if (inode == NULL) {
 846                 d_add(dentry, NULL);
 847                 return NULL;
 848         }
 849         if (IS_ERR(inode))
 850                 return ERR_CAST(inode);
 851 
 852         gl = GFS2_I(inode)->i_gl;
 853         error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
 854         if (error) {
 855                 iput(inode);
 856                 return ERR_PTR(error);
 857         }
 858 
 859         d = d_splice_alias(inode, dentry);
 860         if (IS_ERR(d)) {
 861                 gfs2_glock_dq_uninit(&gh);
 862                 return d;
 863         }
 864         if (file && S_ISREG(inode->i_mode))
 865                 error = finish_open(file, dentry, gfs2_open_common);
 866 
 867         gfs2_glock_dq_uninit(&gh);
 868         if (error) {
 869                 dput(d);
 870                 return ERR_PTR(error);
 871         }
 872         return d;
 873 }
 874 
 875 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
 876                                   unsigned flags)
 877 {
 878         return __gfs2_lookup(dir, dentry, NULL);
 879 }
 880 
 881 /**
 882  * gfs2_link - Link to a file
 883  * @old_dentry: The inode to link
 884  * @dir: Add link to this directory
 885  * @dentry: The name of the link
 886  *
 887  * Link the inode in "old_dentry" into the directory "dir" with the
 888  * name in "dentry".
 889  *
 890  * Returns: errno
 891  */
 892 
 893 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
 894                      struct dentry *dentry)
 895 {
 896         struct gfs2_inode *dip = GFS2_I(dir);
 897         struct gfs2_sbd *sdp = GFS2_SB(dir);
 898         struct inode *inode = d_inode(old_dentry);
 899         struct gfs2_inode *ip = GFS2_I(inode);
 900         struct gfs2_holder ghs[2];
 901         struct buffer_head *dibh;
 902         struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
 903         int error;
 904 
 905         if (S_ISDIR(inode->i_mode))
 906                 return -EPERM;
 907 
 908         error = gfs2_rsqa_alloc(dip);
 909         if (error)
 910                 return error;
 911 
 912         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
 913         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
 914 
 915         error = gfs2_glock_nq(ghs); /* parent */
 916         if (error)
 917                 goto out_parent;
 918 
 919         error = gfs2_glock_nq(ghs + 1); /* child */
 920         if (error)
 921                 goto out_child;
 922 
 923         error = -ENOENT;
 924         if (inode->i_nlink == 0)
 925                 goto out_gunlock;
 926 
 927         error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
 928         if (error)
 929                 goto out_gunlock;
 930 
 931         error = gfs2_dir_check(dir, &dentry->d_name, NULL);
 932         switch (error) {
 933         case -ENOENT:
 934                 break;
 935         case 0:
 936                 error = -EEXIST;
 937         default:
 938                 goto out_gunlock;
 939         }
 940 
 941         error = -EINVAL;
 942         if (!dip->i_inode.i_nlink)
 943                 goto out_gunlock;
 944         error = -EFBIG;
 945         if (dip->i_entries == (u32)-1)
 946                 goto out_gunlock;
 947         error = -EPERM;
 948         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
 949                 goto out_gunlock;
 950         error = -EINVAL;
 951         if (!ip->i_inode.i_nlink)
 952                 goto out_gunlock;
 953         error = -EMLINK;
 954         if (ip->i_inode.i_nlink == (u32)-1)
 955                 goto out_gunlock;
 956 
 957         error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
 958         if (error < 0)
 959                 goto out_gunlock;
 960 
 961         if (da.nr_blocks) {
 962                 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
 963                 error = gfs2_quota_lock_check(dip, &ap);
 964                 if (error)
 965                         goto out_gunlock;
 966 
 967                 error = gfs2_inplace_reserve(dip, &ap);
 968                 if (error)
 969                         goto out_gunlock_q;
 970 
 971                 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
 972                 if (error)
 973                         goto out_ipres;
 974         } else {
 975                 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
 976                 if (error)
 977                         goto out_ipres;
 978         }
 979 
 980         error = gfs2_meta_inode_buffer(ip, &dibh);
 981         if (error)
 982                 goto out_end_trans;
 983 
 984         error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
 985         if (error)
 986                 goto out_brelse;
 987 
 988         gfs2_trans_add_meta(ip->i_gl, dibh);
 989         inc_nlink(&ip->i_inode);
 990         ip->i_inode.i_ctime = current_time(&ip->i_inode);
 991         ihold(inode);
 992         d_instantiate(dentry, inode);
 993         mark_inode_dirty(inode);
 994 
 995 out_brelse:
 996         brelse(dibh);
 997 out_end_trans:
 998         gfs2_trans_end(sdp);
 999 out_ipres:
1000         if (da.nr_blocks)
1001                 gfs2_inplace_release(dip);
1002 out_gunlock_q:
1003         if (da.nr_blocks)
1004                 gfs2_quota_unlock(dip);
1005 out_gunlock:
1006         gfs2_dir_no_add(&da);
1007         gfs2_glock_dq(ghs + 1);
1008 out_child:
1009         gfs2_glock_dq(ghs);
1010 out_parent:
1011         gfs2_holder_uninit(ghs);
1012         gfs2_holder_uninit(ghs + 1);
1013         return error;
1014 }
1015 
1016 /*
1017  * gfs2_unlink_ok - check to see that a inode is still in a directory
1018  * @dip: the directory
1019  * @name: the name of the file
1020  * @ip: the inode
1021  *
1022  * Assumes that the lock on (at least) @dip is held.
1023  *
1024  * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1025  */
1026 
1027 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1028                           const struct gfs2_inode *ip)
1029 {
1030         int error;
1031 
1032         if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1033                 return -EPERM;
1034 
1035         if ((dip->i_inode.i_mode & S_ISVTX) &&
1036             !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1037             !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1038                 return -EPERM;
1039 
1040         if (IS_APPEND(&dip->i_inode))
1041                 return -EPERM;
1042 
1043         error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
1044         if (error)
1045                 return error;
1046 
1047         return gfs2_dir_check(&dip->i_inode, name, ip);
1048 }
1049 
1050 /**
1051  * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1052  * @dip: The parent directory
1053  * @name: The name of the entry in the parent directory
1054  * @inode: The inode to be removed
1055  *
1056  * Called with all the locks and in a transaction. This will only be
1057  * called for a directory after it has been checked to ensure it is empty.
1058  *
1059  * Returns: 0 on success, or an error
1060  */
1061 
1062 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1063                              const struct dentry *dentry)
1064 {
1065         struct inode *inode = d_inode(dentry);
1066         struct gfs2_inode *ip = GFS2_I(inode);
1067         int error;
1068 
1069         error = gfs2_dir_del(dip, dentry);
1070         if (error)
1071                 return error;
1072 
1073         ip->i_entries = 0;
1074         inode->i_ctime = current_time(inode);
1075         if (S_ISDIR(inode->i_mode))
1076                 clear_nlink(inode);
1077         else
1078                 drop_nlink(inode);
1079         mark_inode_dirty(inode);
1080         if (inode->i_nlink == 0)
1081                 gfs2_unlink_di(inode);
1082         return 0;
1083 }
1084 
1085 
1086 /**
1087  * gfs2_unlink - Unlink an inode (this does rmdir as well)
1088  * @dir: The inode of the directory containing the inode to unlink
1089  * @dentry: The file itself
1090  *
1091  * This routine uses the type of the inode as a flag to figure out
1092  * whether this is an unlink or an rmdir.
1093  *
1094  * Returns: errno
1095  */
1096 
1097 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1098 {
1099         struct gfs2_inode *dip = GFS2_I(dir);
1100         struct gfs2_sbd *sdp = GFS2_SB(dir);
1101         struct inode *inode = d_inode(dentry);
1102         struct gfs2_inode *ip = GFS2_I(inode);
1103         struct gfs2_holder ghs[3];
1104         struct gfs2_rgrpd *rgd;
1105         int error;
1106 
1107         error = gfs2_rindex_update(sdp);
1108         if (error)
1109                 return error;
1110 
1111         error = -EROFS;
1112 
1113         gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
1114         gfs2_holder_init(ip->i_gl,  LM_ST_EXCLUSIVE, 0, ghs + 1);
1115 
1116         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1117         if (!rgd)
1118                 goto out_inodes;
1119 
1120         gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
1121 
1122 
1123         error = gfs2_glock_nq(ghs); /* parent */
1124         if (error)
1125                 goto out_parent;
1126 
1127         error = gfs2_glock_nq(ghs + 1); /* child */
1128         if (error)
1129                 goto out_child;
1130 
1131         error = -ENOENT;
1132         if (inode->i_nlink == 0)
1133                 goto out_rgrp;
1134 
1135         if (S_ISDIR(inode->i_mode)) {
1136                 error = -ENOTEMPTY;
1137                 if (ip->i_entries > 2 || inode->i_nlink > 2)
1138                         goto out_rgrp;
1139         }
1140 
1141         error = gfs2_glock_nq(ghs + 2); /* rgrp */
1142         if (error)
1143                 goto out_rgrp;
1144 
1145         error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1146         if (error)
1147                 goto out_gunlock;
1148 
1149         error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1150         if (error)
1151                 goto out_gunlock;
1152 
1153         error = gfs2_unlink_inode(dip, dentry);
1154         gfs2_trans_end(sdp);
1155 
1156 out_gunlock:
1157         gfs2_glock_dq(ghs + 2);
1158 out_rgrp:
1159         gfs2_glock_dq(ghs + 1);
1160 out_child:
1161         gfs2_glock_dq(ghs);
1162 out_parent:
1163         gfs2_holder_uninit(ghs + 2);
1164 out_inodes:
1165         gfs2_holder_uninit(ghs + 1);
1166         gfs2_holder_uninit(ghs);
1167         return error;
1168 }
1169 
1170 /**
1171  * gfs2_symlink - Create a symlink
1172  * @dir: The directory to create the symlink in
1173  * @dentry: The dentry to put the symlink in
1174  * @symname: The thing which the link points to
1175  *
1176  * Returns: errno
1177  */
1178 
1179 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
1180                         const char *symname)
1181 {
1182         unsigned int size;
1183 
1184         size = strlen(symname);
1185         if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1186                 return -ENAMETOOLONG;
1187 
1188         return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1189 }
1190 
1191 /**
1192  * gfs2_mkdir - Make a directory
1193  * @dir: The parent directory of the new one
1194  * @dentry: The dentry of the new directory
1195  * @mode: The mode of the new directory
1196  *
1197  * Returns: errno
1198  */
1199 
1200 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
1201 {
1202         unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1203         return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1204 }
1205 
1206 /**
1207  * gfs2_mknod - Make a special file
1208  * @dir: The directory in which the special file will reside
1209  * @dentry: The dentry of the special file
1210  * @mode: The mode of the special file
1211  * @dev: The device specification of the special file
1212  *
1213  */
1214 
1215 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
1216                       dev_t dev)
1217 {
1218         return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1219 }
1220 
1221 /**
1222  * gfs2_atomic_open - Atomically open a file
1223  * @dir: The directory
1224  * @dentry: The proposed new entry
1225  * @file: The proposed new struct file
1226  * @flags: open flags
1227  * @mode: File mode
1228  *
1229  * Returns: error code or 0 for success
1230  */
1231 
1232 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1233                             struct file *file, unsigned flags,
1234                             umode_t mode)
1235 {
1236         struct dentry *d;
1237         bool excl = !!(flags & O_EXCL);
1238 
1239         if (!d_in_lookup(dentry))
1240                 goto skip_lookup;
1241 
1242         d = __gfs2_lookup(dir, dentry, file);
1243         if (IS_ERR(d))
1244                 return PTR_ERR(d);
1245         if (d != NULL)
1246                 dentry = d;
1247         if (d_really_is_positive(dentry)) {
1248                 if (!(file->f_mode & FMODE_OPENED))
1249                         return finish_no_open(file, d);
1250                 dput(d);
1251                 return excl && (flags & O_CREAT) ? -EEXIST : 0;
1252         }
1253 
1254         BUG_ON(d != NULL);
1255 
1256 skip_lookup:
1257         if (!(flags & O_CREAT))
1258                 return -ENOENT;
1259 
1260         return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1261 }
1262 
1263 /*
1264  * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1265  * @this: move this
1266  * @to: to here
1267  *
1268  * Follow @to back to the root and make sure we don't encounter @this
1269  * Assumes we already hold the rename lock.
1270  *
1271  * Returns: errno
1272  */
1273 
1274 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1275 {
1276         struct inode *dir = &to->i_inode;
1277         struct super_block *sb = dir->i_sb;
1278         struct inode *tmp;
1279         int error = 0;
1280 
1281         igrab(dir);
1282 
1283         for (;;) {
1284                 if (dir == &this->i_inode) {
1285                         error = -EINVAL;
1286                         break;
1287                 }
1288                 if (dir == d_inode(sb->s_root)) {
1289                         error = 0;
1290                         break;
1291                 }
1292 
1293                 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1294                 if (!tmp) {
1295                         error = -ENOENT;
1296                         break;
1297                 }
1298                 if (IS_ERR(tmp)) {
1299                         error = PTR_ERR(tmp);
1300                         break;
1301                 }
1302 
1303                 iput(dir);
1304                 dir = tmp;
1305         }
1306 
1307         iput(dir);
1308 
1309         return error;
1310 }
1311 
1312 /**
1313  * update_moved_ino - Update an inode that's being moved
1314  * @ip: The inode being moved
1315  * @ndip: The parent directory of the new filename
1316  * @dir_rename: True of ip is a directory
1317  *
1318  * Returns: errno
1319  */
1320 
1321 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1322                             int dir_rename)
1323 {
1324         if (dir_rename)
1325                 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1326 
1327         ip->i_inode.i_ctime = current_time(&ip->i_inode);
1328         mark_inode_dirty_sync(&ip->i_inode);
1329         return 0;
1330 }
1331 
1332 
1333 /**
1334  * gfs2_rename - Rename a file
1335  * @odir: Parent directory of old file name
1336  * @odentry: The old dentry of the file
1337  * @ndir: Parent directory of new file name
1338  * @ndentry: The new dentry of the file
1339  *
1340  * Returns: errno
1341  */
1342 
1343 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1344                        struct inode *ndir, struct dentry *ndentry)
1345 {
1346         struct gfs2_inode *odip = GFS2_I(odir);
1347         struct gfs2_inode *ndip = GFS2_I(ndir);
1348         struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1349         struct gfs2_inode *nip = NULL;
1350         struct gfs2_sbd *sdp = GFS2_SB(odir);
1351         struct gfs2_holder ghs[4], r_gh, rd_gh;
1352         struct gfs2_rgrpd *nrgd;
1353         unsigned int num_gh;
1354         int dir_rename = 0;
1355         struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1356         unsigned int x;
1357         int error;
1358 
1359         gfs2_holder_mark_uninitialized(&r_gh);
1360         gfs2_holder_mark_uninitialized(&rd_gh);
1361         if (d_really_is_positive(ndentry)) {
1362                 nip = GFS2_I(d_inode(ndentry));
1363                 if (ip == nip)
1364                         return 0;
1365         }
1366 
1367         error = gfs2_rindex_update(sdp);
1368         if (error)
1369                 return error;
1370 
1371         error = gfs2_rsqa_alloc(ndip);
1372         if (error)
1373                 return error;
1374 
1375         if (odip != ndip) {
1376                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1377                                            0, &r_gh);
1378                 if (error)
1379                         goto out;
1380 
1381                 if (S_ISDIR(ip->i_inode.i_mode)) {
1382                         dir_rename = 1;
1383                         /* don't move a directory into its subdir */
1384                         error = gfs2_ok_to_move(ip, ndip);
1385                         if (error)
1386                                 goto out_gunlock_r;
1387                 }
1388         }
1389 
1390         num_gh = 1;
1391         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1392         if (odip != ndip) {
1393                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1394                                  ghs + num_gh);
1395                 num_gh++;
1396         }
1397         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1398         num_gh++;
1399 
1400         if (nip) {
1401                 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1402                                  ghs + num_gh);
1403                 num_gh++;
1404         }
1405 
1406         for (x = 0; x < num_gh; x++) {
1407                 error = gfs2_glock_nq(ghs + x);
1408                 if (error)
1409                         goto out_gunlock;
1410         }
1411         error = gfs2_glock_async_wait(num_gh, ghs);
1412         if (error)
1413                 goto out_gunlock;
1414 
1415         if (nip) {
1416                 /* Grab the resource group glock for unlink flag twiddling.
1417                  * This is the case where the target dinode already exists
1418                  * so we unlink before doing the rename.
1419                  */
1420                 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1421                 if (!nrgd) {
1422                         error = -ENOENT;
1423                         goto out_gunlock;
1424                 }
1425                 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1426                                            &rd_gh);
1427                 if (error)
1428                         goto out_gunlock;
1429         }
1430 
1431         error = -ENOENT;
1432         if (ip->i_inode.i_nlink == 0)
1433                 goto out_gunlock;
1434 
1435         /* Check out the old directory */
1436 
1437         error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1438         if (error)
1439                 goto out_gunlock;
1440 
1441         /* Check out the new directory */
1442 
1443         if (nip) {
1444                 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1445                 if (error)
1446                         goto out_gunlock;
1447 
1448                 if (nip->i_inode.i_nlink == 0) {
1449                         error = -EAGAIN;
1450                         goto out_gunlock;
1451                 }
1452 
1453                 if (S_ISDIR(nip->i_inode.i_mode)) {
1454                         if (nip->i_entries < 2) {
1455                                 gfs2_consist_inode(nip);
1456                                 error = -EIO;
1457                                 goto out_gunlock;
1458                         }
1459                         if (nip->i_entries > 2) {
1460                                 error = -ENOTEMPTY;
1461                                 goto out_gunlock;
1462                         }
1463                 }
1464         } else {
1465                 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
1466                 if (error)
1467                         goto out_gunlock;
1468 
1469                 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1470                 switch (error) {
1471                 case -ENOENT:
1472                         error = 0;
1473                         break;
1474                 case 0:
1475                         error = -EEXIST;
1476                 default:
1477                         goto out_gunlock;
1478                 };
1479 
1480                 if (odip != ndip) {
1481                         if (!ndip->i_inode.i_nlink) {
1482                                 error = -ENOENT;
1483                                 goto out_gunlock;
1484                         }
1485                         if (ndip->i_entries == (u32)-1) {
1486                                 error = -EFBIG;
1487                                 goto out_gunlock;
1488                         }
1489                         if (S_ISDIR(ip->i_inode.i_mode) &&
1490                             ndip->i_inode.i_nlink == (u32)-1) {
1491                                 error = -EMLINK;
1492                                 goto out_gunlock;
1493                         }
1494                 }
1495         }
1496 
1497         /* Check out the dir to be renamed */
1498 
1499         if (dir_rename) {
1500                 error = gfs2_permission(d_inode(odentry), MAY_WRITE);
1501                 if (error)
1502                         goto out_gunlock;
1503         }
1504 
1505         if (nip == NULL) {
1506                 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1507                 if (error)
1508                         goto out_gunlock;
1509         }
1510 
1511         if (da.nr_blocks) {
1512                 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1513                 error = gfs2_quota_lock_check(ndip, &ap);
1514                 if (error)
1515                         goto out_gunlock;
1516 
1517                 error = gfs2_inplace_reserve(ndip, &ap);
1518                 if (error)
1519                         goto out_gunlock_q;
1520 
1521                 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1522                                          4 * RES_LEAF + 4, 0);
1523                 if (error)
1524                         goto out_ipreserv;
1525         } else {
1526                 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1527                                          5 * RES_LEAF + 4, 0);
1528                 if (error)
1529                         goto out_gunlock;
1530         }
1531 
1532         /* Remove the target file, if it exists */
1533 
1534         if (nip)
1535                 error = gfs2_unlink_inode(ndip, ndentry);
1536 
1537         error = update_moved_ino(ip, ndip, dir_rename);
1538         if (error)
1539                 goto out_end_trans;
1540 
1541         error = gfs2_dir_del(odip, odentry);
1542         if (error)
1543                 goto out_end_trans;
1544 
1545         error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1546         if (error)
1547                 goto out_end_trans;
1548 
1549 out_end_trans:
1550         gfs2_trans_end(sdp);
1551 out_ipreserv:
1552         if (da.nr_blocks)
1553                 gfs2_inplace_release(ndip);
1554 out_gunlock_q:
1555         if (da.nr_blocks)
1556                 gfs2_quota_unlock(ndip);
1557 out_gunlock:
1558         gfs2_dir_no_add(&da);
1559         if (gfs2_holder_initialized(&rd_gh))
1560                 gfs2_glock_dq_uninit(&rd_gh);
1561 
1562         while (x--) {
1563                 if (gfs2_holder_queued(ghs + x))
1564                         gfs2_glock_dq(ghs + x);
1565                 gfs2_holder_uninit(ghs + x);
1566         }
1567 out_gunlock_r:
1568         if (gfs2_holder_initialized(&r_gh))
1569                 gfs2_glock_dq_uninit(&r_gh);
1570 out:
1571         return error;
1572 }
1573 
1574 /**
1575  * gfs2_exchange - exchange two files
1576  * @odir: Parent directory of old file name
1577  * @odentry: The old dentry of the file
1578  * @ndir: Parent directory of new file name
1579  * @ndentry: The new dentry of the file
1580  * @flags: The rename flags
1581  *
1582  * Returns: errno
1583  */
1584 
1585 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1586                          struct inode *ndir, struct dentry *ndentry,
1587                          unsigned int flags)
1588 {
1589         struct gfs2_inode *odip = GFS2_I(odir);
1590         struct gfs2_inode *ndip = GFS2_I(ndir);
1591         struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1592         struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1593         struct gfs2_sbd *sdp = GFS2_SB(odir);
1594         struct gfs2_holder ghs[4], r_gh;
1595         unsigned int num_gh;
1596         unsigned int x;
1597         umode_t old_mode = oip->i_inode.i_mode;
1598         umode_t new_mode = nip->i_inode.i_mode;
1599         int error;
1600 
1601         gfs2_holder_mark_uninitialized(&r_gh);
1602         error = gfs2_rindex_update(sdp);
1603         if (error)
1604                 return error;
1605 
1606         if (odip != ndip) {
1607                 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1608                                            0, &r_gh);
1609                 if (error)
1610                         goto out;
1611 
1612                 if (S_ISDIR(old_mode)) {
1613                         /* don't move a directory into its subdir */
1614                         error = gfs2_ok_to_move(oip, ndip);
1615                         if (error)
1616                                 goto out_gunlock_r;
1617                 }
1618 
1619                 if (S_ISDIR(new_mode)) {
1620                         /* don't move a directory into its subdir */
1621                         error = gfs2_ok_to_move(nip, odip);
1622                         if (error)
1623                                 goto out_gunlock_r;
1624                 }
1625         }
1626 
1627         num_gh = 1;
1628         gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1629         if (odip != ndip) {
1630                 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1631                                  ghs + num_gh);
1632                 num_gh++;
1633         }
1634         gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1635         num_gh++;
1636 
1637         gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1638         num_gh++;
1639 
1640         for (x = 0; x < num_gh; x++) {
1641                 error = gfs2_glock_nq(ghs + x);
1642                 if (error)
1643                         goto out_gunlock;
1644         }
1645 
1646         error = gfs2_glock_async_wait(num_gh, ghs);
1647         if (error)
1648                 goto out_gunlock;
1649 
1650         error = -ENOENT;
1651         if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1652                 goto out_gunlock;
1653 
1654         error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1655         if (error)
1656                 goto out_gunlock;
1657         error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1658         if (error)
1659                 goto out_gunlock;
1660 
1661         if (S_ISDIR(old_mode)) {
1662                 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
1663                 if (error)
1664                         goto out_gunlock;
1665         }
1666         if (S_ISDIR(new_mode)) {
1667                 error = gfs2_permission(ndentry->d_inode, MAY_WRITE);
1668                 if (error)
1669                         goto out_gunlock;
1670         }
1671         error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1672         if (error)
1673                 goto out_gunlock;
1674 
1675         error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1676         if (error)
1677                 goto out_end_trans;
1678 
1679         error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1680         if (error)
1681                 goto out_end_trans;
1682 
1683         error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1684                                IF2DT(old_mode));
1685         if (error)
1686                 goto out_end_trans;
1687 
1688         error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1689                                IF2DT(new_mode));
1690         if (error)
1691                 goto out_end_trans;
1692 
1693         if (odip != ndip) {
1694                 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1695                         inc_nlink(&odip->i_inode);
1696                         drop_nlink(&ndip->i_inode);
1697                 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1698                         inc_nlink(&ndip->i_inode);
1699                         drop_nlink(&odip->i_inode);
1700                 }
1701         }
1702         mark_inode_dirty(&ndip->i_inode);
1703         if (odip != ndip)
1704                 mark_inode_dirty(&odip->i_inode);
1705 
1706 out_end_trans:
1707         gfs2_trans_end(sdp);
1708 out_gunlock:
1709         while (x--) {
1710                 if (gfs2_holder_queued(ghs + x))
1711                         gfs2_glock_dq(ghs + x);
1712                 gfs2_holder_uninit(ghs + x);
1713         }
1714 out_gunlock_r:
1715         if (gfs2_holder_initialized(&r_gh))
1716                 gfs2_glock_dq_uninit(&r_gh);
1717 out:
1718         return error;
1719 }
1720 
1721 static int gfs2_rename2(struct inode *odir, struct dentry *odentry,
1722                         struct inode *ndir, struct dentry *ndentry,
1723                         unsigned int flags)
1724 {
1725         flags &= ~RENAME_NOREPLACE;
1726 
1727         if (flags & ~RENAME_EXCHANGE)
1728                 return -EINVAL;
1729 
1730         if (flags & RENAME_EXCHANGE)
1731                 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1732 
1733         return gfs2_rename(odir, odentry, ndir, ndentry);
1734 }
1735 
1736 /**
1737  * gfs2_get_link - Follow a symbolic link
1738  * @dentry: The dentry of the link
1739  * @inode: The inode of the link
1740  * @done: destructor for return value
1741  *
1742  * This can handle symlinks of any size.
1743  *
1744  * Returns: 0 on success or error code
1745  */
1746 
1747 static const char *gfs2_get_link(struct dentry *dentry,
1748                                  struct inode *inode,
1749                                  struct delayed_call *done)
1750 {
1751         struct gfs2_inode *ip = GFS2_I(inode);
1752         struct gfs2_holder i_gh;
1753         struct buffer_head *dibh;
1754         unsigned int size;
1755         char *buf;
1756         int error;
1757 
1758         if (!dentry)
1759                 return ERR_PTR(-ECHILD);
1760 
1761         gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1762         error = gfs2_glock_nq(&i_gh);
1763         if (error) {
1764                 gfs2_holder_uninit(&i_gh);
1765                 return ERR_PTR(error);
1766         }
1767 
1768         size = (unsigned int)i_size_read(&ip->i_inode);
1769         if (size == 0) {
1770                 gfs2_consist_inode(ip);
1771                 buf = ERR_PTR(-EIO);
1772                 goto out;
1773         }
1774 
1775         error = gfs2_meta_inode_buffer(ip, &dibh);
1776         if (error) {
1777                 buf = ERR_PTR(error);
1778                 goto out;
1779         }
1780 
1781         buf = kzalloc(size + 1, GFP_NOFS);
1782         if (!buf)
1783                 buf = ERR_PTR(-ENOMEM);
1784         else
1785                 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1786         brelse(dibh);
1787 out:
1788         gfs2_glock_dq_uninit(&i_gh);
1789         if (!IS_ERR(buf))
1790                 set_delayed_call(done, kfree_link, buf);
1791         return buf;
1792 }
1793 
1794 /**
1795  * gfs2_permission -
1796  * @inode: The inode
1797  * @mask: The mask to be tested
1798  * @flags: Indicates whether this is an RCU path walk or not
1799  *
1800  * This may be called from the VFS directly, or from within GFS2 with the
1801  * inode locked, so we look to see if the glock is already locked and only
1802  * lock the glock if its not already been done.
1803  *
1804  * Returns: errno
1805  */
1806 
1807 int gfs2_permission(struct inode *inode, int mask)
1808 {
1809         struct gfs2_inode *ip;
1810         struct gfs2_holder i_gh;
1811         int error;
1812 
1813         gfs2_holder_mark_uninitialized(&i_gh);
1814         ip = GFS2_I(inode);
1815         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1816                 if (mask & MAY_NOT_BLOCK)
1817                         return -ECHILD;
1818                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1819                 if (error)
1820                         return error;
1821         }
1822 
1823         if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1824                 error = -EPERM;
1825         else
1826                 error = generic_permission(inode, mask);
1827         if (gfs2_holder_initialized(&i_gh))
1828                 gfs2_glock_dq_uninit(&i_gh);
1829 
1830         return error;
1831 }
1832 
1833 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1834 {
1835         setattr_copy(inode, attr);
1836         mark_inode_dirty(inode);
1837         return 0;
1838 }
1839 
1840 /**
1841  * gfs2_setattr_simple -
1842  * @ip:
1843  * @attr:
1844  *
1845  * Returns: errno
1846  */
1847 
1848 int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1849 {
1850         int error;
1851 
1852         if (current->journal_info)
1853                 return __gfs2_setattr_simple(inode, attr);
1854 
1855         error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1856         if (error)
1857                 return error;
1858 
1859         error = __gfs2_setattr_simple(inode, attr);
1860         gfs2_trans_end(GFS2_SB(inode));
1861         return error;
1862 }
1863 
1864 static int setattr_chown(struct inode *inode, struct iattr *attr)
1865 {
1866         struct gfs2_inode *ip = GFS2_I(inode);
1867         struct gfs2_sbd *sdp = GFS2_SB(inode);
1868         kuid_t ouid, nuid;
1869         kgid_t ogid, ngid;
1870         int error;
1871         struct gfs2_alloc_parms ap;
1872 
1873         ouid = inode->i_uid;
1874         ogid = inode->i_gid;
1875         nuid = attr->ia_uid;
1876         ngid = attr->ia_gid;
1877 
1878         if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1879                 ouid = nuid = NO_UID_QUOTA_CHANGE;
1880         if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1881                 ogid = ngid = NO_GID_QUOTA_CHANGE;
1882 
1883         error = gfs2_rsqa_alloc(ip);
1884         if (error)
1885                 goto out;
1886 
1887         error = gfs2_rindex_update(sdp);
1888         if (error)
1889                 goto out;
1890 
1891         error = gfs2_quota_lock(ip, nuid, ngid);
1892         if (error)
1893                 goto out;
1894 
1895         ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1896 
1897         if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1898             !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1899                 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1900                 if (error)
1901                         goto out_gunlock_q;
1902         }
1903 
1904         error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1905         if (error)
1906                 goto out_gunlock_q;
1907 
1908         error = gfs2_setattr_simple(inode, attr);
1909         if (error)
1910                 goto out_end_trans;
1911 
1912         if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1913             !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1914                 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1915                 gfs2_quota_change(ip, ap.target, nuid, ngid);
1916         }
1917 
1918 out_end_trans:
1919         gfs2_trans_end(sdp);
1920 out_gunlock_q:
1921         gfs2_quota_unlock(ip);
1922 out:
1923         return error;
1924 }
1925 
1926 /**
1927  * gfs2_setattr - Change attributes on an inode
1928  * @dentry: The dentry which is changing
1929  * @attr: The structure describing the change
1930  *
1931  * The VFS layer wants to change one or more of an inodes attributes.  Write
1932  * that change out to disk.
1933  *
1934  * Returns: errno
1935  */
1936 
1937 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1938 {
1939         struct inode *inode = d_inode(dentry);
1940         struct gfs2_inode *ip = GFS2_I(inode);
1941         struct gfs2_holder i_gh;
1942         int error;
1943 
1944         error = gfs2_rsqa_alloc(ip);
1945         if (error)
1946                 return error;
1947 
1948         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1949         if (error)
1950                 return error;
1951 
1952         error = -EPERM;
1953         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1954                 goto out;
1955 
1956         error = setattr_prepare(dentry, attr);
1957         if (error)
1958                 goto out;
1959 
1960         if (attr->ia_valid & ATTR_SIZE)
1961                 error = gfs2_setattr_size(inode, attr->ia_size);
1962         else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1963                 error = setattr_chown(inode, attr);
1964         else {
1965                 error = gfs2_setattr_simple(inode, attr);
1966                 if (!error && attr->ia_valid & ATTR_MODE)
1967                         error = posix_acl_chmod(inode, inode->i_mode);
1968         }
1969 
1970 out:
1971         if (!error)
1972                 mark_inode_dirty(inode);
1973         gfs2_glock_dq_uninit(&i_gh);
1974         return error;
1975 }
1976 
1977 /**
1978  * gfs2_getattr - Read out an inode's attributes
1979  * @path: Object to query
1980  * @stat: The inode's stats
1981  * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
1982  * @flags: AT_STATX_xxx setting
1983  *
1984  * This may be called from the VFS directly, or from within GFS2 with the
1985  * inode locked, so we look to see if the glock is already locked and only
1986  * lock the glock if its not already been done. Note that its the NFS
1987  * readdirplus operation which causes this to be called (from filldir)
1988  * with the glock already held.
1989  *
1990  * Returns: errno
1991  */
1992 
1993 static int gfs2_getattr(const struct path *path, struct kstat *stat,
1994                         u32 request_mask, unsigned int flags)
1995 {
1996         struct inode *inode = d_inode(path->dentry);
1997         struct gfs2_inode *ip = GFS2_I(inode);
1998         struct gfs2_holder gh;
1999         u32 gfsflags;
2000         int error;
2001 
2002         gfs2_holder_mark_uninitialized(&gh);
2003         if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2004                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2005                 if (error)
2006                         return error;
2007         }
2008 
2009         gfsflags = ip->i_diskflags;
2010         if (gfsflags & GFS2_DIF_APPENDONLY)
2011                 stat->attributes |= STATX_ATTR_APPEND;
2012         if (gfsflags & GFS2_DIF_IMMUTABLE)
2013                 stat->attributes |= STATX_ATTR_IMMUTABLE;
2014 
2015         stat->attributes_mask |= (STATX_ATTR_APPEND |
2016                                   STATX_ATTR_COMPRESSED |
2017                                   STATX_ATTR_ENCRYPTED |
2018                                   STATX_ATTR_IMMUTABLE |
2019                                   STATX_ATTR_NODUMP);
2020 
2021         generic_fillattr(inode, stat);
2022 
2023         if (gfs2_holder_initialized(&gh))
2024                 gfs2_glock_dq_uninit(&gh);
2025 
2026         return 0;
2027 }
2028 
2029 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2030                        u64 start, u64 len)
2031 {
2032         struct gfs2_inode *ip = GFS2_I(inode);
2033         struct gfs2_holder gh;
2034         int ret;
2035 
2036         inode_lock_shared(inode);
2037 
2038         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2039         if (ret)
2040                 goto out;
2041 
2042         ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2043 
2044         gfs2_glock_dq_uninit(&gh);
2045 
2046 out:
2047         inode_unlock_shared(inode);
2048         return ret;
2049 }
2050 
2051 loff_t gfs2_seek_data(struct file *file, loff_t offset)
2052 {
2053         struct inode *inode = file->f_mapping->host;
2054         struct gfs2_inode *ip = GFS2_I(inode);
2055         struct gfs2_holder gh;
2056         loff_t ret;
2057 
2058         inode_lock_shared(inode);
2059         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2060         if (!ret)
2061                 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2062         gfs2_glock_dq_uninit(&gh);
2063         inode_unlock_shared(inode);
2064 
2065         if (ret < 0)
2066                 return ret;
2067         return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2068 }
2069 
2070 loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2071 {
2072         struct inode *inode = file->f_mapping->host;
2073         struct gfs2_inode *ip = GFS2_I(inode);
2074         struct gfs2_holder gh;
2075         loff_t ret;
2076 
2077         inode_lock_shared(inode);
2078         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2079         if (!ret)
2080                 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2081         gfs2_glock_dq_uninit(&gh);
2082         inode_unlock_shared(inode);
2083 
2084         if (ret < 0)
2085                 return ret;
2086         return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2087 }
2088 
2089 const struct inode_operations gfs2_file_iops = {
2090         .permission = gfs2_permission,
2091         .setattr = gfs2_setattr,
2092         .getattr = gfs2_getattr,
2093         .listxattr = gfs2_listxattr,
2094         .fiemap = gfs2_fiemap,
2095         .get_acl = gfs2_get_acl,
2096         .set_acl = gfs2_set_acl,
2097 };
2098 
2099 const struct inode_operations gfs2_dir_iops = {
2100         .create = gfs2_create,
2101         .lookup = gfs2_lookup,
2102         .link = gfs2_link,
2103         .unlink = gfs2_unlink,
2104         .symlink = gfs2_symlink,
2105         .mkdir = gfs2_mkdir,
2106         .rmdir = gfs2_unlink,
2107         .mknod = gfs2_mknod,
2108         .rename = gfs2_rename2,
2109         .permission = gfs2_permission,
2110         .setattr = gfs2_setattr,
2111         .getattr = gfs2_getattr,
2112         .listxattr = gfs2_listxattr,
2113         .fiemap = gfs2_fiemap,
2114         .get_acl = gfs2_get_acl,
2115         .set_acl = gfs2_set_acl,
2116         .atomic_open = gfs2_atomic_open,
2117 };
2118 
2119 const struct inode_operations gfs2_symlink_iops = {
2120         .get_link = gfs2_get_link,
2121         .permission = gfs2_permission,
2122         .setattr = gfs2_setattr,
2123         .getattr = gfs2_getattr,
2124         .listxattr = gfs2_listxattr,
2125         .fiemap = gfs2_fiemap,
2126 };
2127
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root/fs/gfs2/inode.c

DEFINITIONS
