linux/fs/xfs/xfs_iops.c
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   1/*
   2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3 * All Rights Reserved.
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of the GNU General Public License as
   7 * published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it would be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write the Free Software Foundation,
  16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18#include "xfs.h"
  19#include "xfs_fs.h"
  20#include "xfs_acl.h"
  21#include "xfs_log.h"
  22#include "xfs_trans.h"
  23#include "xfs_sb.h"
  24#include "xfs_ag.h"
  25#include "xfs_alloc.h"
  26#include "xfs_quota.h"
  27#include "xfs_mount.h"
  28#include "xfs_bmap_btree.h"
  29#include "xfs_dinode.h"
  30#include "xfs_inode.h"
  31#include "xfs_bmap.h"
  32#include "xfs_rtalloc.h"
  33#include "xfs_error.h"
  34#include "xfs_itable.h"
  35#include "xfs_attr.h"
  36#include "xfs_buf_item.h"
  37#include "xfs_utils.h"
  38#include "xfs_vnodeops.h"
  39#include "xfs_inode_item.h"
  40#include "xfs_trace.h"
  41
  42#include <linux/capability.h>
  43#include <linux/xattr.h>
  44#include <linux/namei.h>
  45#include <linux/posix_acl.h>
  46#include <linux/security.h>
  47#include <linux/fiemap.h>
  48#include <linux/slab.h>
  49
  50static int
  51xfs_initxattrs(
  52        struct inode            *inode,
  53        const struct xattr      *xattr_array,
  54        void                    *fs_info)
  55{
  56        const struct xattr      *xattr;
  57        struct xfs_inode        *ip = XFS_I(inode);
  58        int                     error = 0;
  59
  60        for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  61                error = xfs_attr_set(ip, xattr->name, xattr->value,
  62                                     xattr->value_len, ATTR_SECURE);
  63                if (error < 0)
  64                        break;
  65        }
  66        return error;
  67}
  68
  69/*
  70 * Hook in SELinux.  This is not quite correct yet, what we really need
  71 * here (as we do for default ACLs) is a mechanism by which creation of
  72 * these attrs can be journalled at inode creation time (along with the
  73 * inode, of course, such that log replay can't cause these to be lost).
  74 */
  75
  76STATIC int
  77xfs_init_security(
  78        struct inode    *inode,
  79        struct inode    *dir,
  80        const struct qstr *qstr)
  81{
  82        return security_inode_init_security(inode, dir, qstr,
  83                                            &xfs_initxattrs, NULL);
  84}
  85
  86static void
  87xfs_dentry_to_name(
  88        struct xfs_name *namep,
  89        struct dentry   *dentry)
  90{
  91        namep->name = dentry->d_name.name;
  92        namep->len = dentry->d_name.len;
  93}
  94
  95STATIC void
  96xfs_cleanup_inode(
  97        struct inode    *dir,
  98        struct inode    *inode,
  99        struct dentry   *dentry)
 100{
 101        struct xfs_name teardown;
 102
 103        /* Oh, the horror.
 104         * If we can't add the ACL or we fail in
 105         * xfs_init_security we must back out.
 106         * ENOSPC can hit here, among other things.
 107         */
 108        xfs_dentry_to_name(&teardown, dentry);
 109
 110        xfs_remove(XFS_I(dir), &teardown, XFS_I(inode));
 111        iput(inode);
 112}
 113
 114STATIC int
 115xfs_vn_mknod(
 116        struct inode    *dir,
 117        struct dentry   *dentry,
 118        umode_t         mode,
 119        dev_t           rdev)
 120{
 121        struct inode    *inode;
 122        struct xfs_inode *ip = NULL;
 123        struct posix_acl *default_acl = NULL;
 124        struct xfs_name name;
 125        int             error;
 126
 127        /*
 128         * Irix uses Missed'em'V split, but doesn't want to see
 129         * the upper 5 bits of (14bit) major.
 130         */
 131        if (S_ISCHR(mode) || S_ISBLK(mode)) {
 132                if (unlikely(!sysv_valid_dev(rdev) || MAJOR(rdev) & ~0x1ff))
 133                        return -EINVAL;
 134                rdev = sysv_encode_dev(rdev);
 135        } else {
 136                rdev = 0;
 137        }
 138
 139        if (IS_POSIXACL(dir)) {
 140                default_acl = xfs_get_acl(dir, ACL_TYPE_DEFAULT);
 141                if (IS_ERR(default_acl))
 142                        return PTR_ERR(default_acl);
 143
 144                if (!default_acl)
 145                        mode &= ~current_umask();
 146        }
 147
 148        xfs_dentry_to_name(&name, dentry);
 149        error = xfs_create(XFS_I(dir), &name, mode, rdev, &ip);
 150        if (unlikely(error))
 151                goto out_free_acl;
 152
 153        inode = VFS_I(ip);
 154
 155        error = xfs_init_security(inode, dir, &dentry->d_name);
 156        if (unlikely(error))
 157                goto out_cleanup_inode;
 158
 159        if (default_acl) {
 160                error = -xfs_inherit_acl(inode, default_acl);
 161                default_acl = NULL;
 162                if (unlikely(error))
 163                        goto out_cleanup_inode;
 164        }
 165
 166
 167        d_instantiate(dentry, inode);
 168        return -error;
 169
 170 out_cleanup_inode:
 171        xfs_cleanup_inode(dir, inode, dentry);
 172 out_free_acl:
 173        posix_acl_release(default_acl);
 174        return -error;
 175}
 176
 177STATIC int
 178xfs_vn_create(
 179        struct inode    *dir,
 180        struct dentry   *dentry,
 181        umode_t         mode,
 182        bool            flags)
 183{
 184        return xfs_vn_mknod(dir, dentry, mode, 0);
 185}
 186
 187STATIC int
 188xfs_vn_mkdir(
 189        struct inode    *dir,
 190        struct dentry   *dentry,
 191        umode_t         mode)
 192{
 193        return xfs_vn_mknod(dir, dentry, mode|S_IFDIR, 0);
 194}
 195
 196STATIC struct dentry *
 197xfs_vn_lookup(
 198        struct inode    *dir,
 199        struct dentry   *dentry,
 200        unsigned int flags)
 201{
 202        struct xfs_inode *cip;
 203        struct xfs_name name;
 204        int             error;
 205
 206        if (dentry->d_name.len >= MAXNAMELEN)
 207                return ERR_PTR(-ENAMETOOLONG);
 208
 209        xfs_dentry_to_name(&name, dentry);
 210        error = xfs_lookup(XFS_I(dir), &name, &cip, NULL);
 211        if (unlikely(error)) {
 212                if (unlikely(error != ENOENT))
 213                        return ERR_PTR(-error);
 214                d_add(dentry, NULL);
 215                return NULL;
 216        }
 217
 218        return d_splice_alias(VFS_I(cip), dentry);
 219}
 220
 221STATIC struct dentry *
 222xfs_vn_ci_lookup(
 223        struct inode    *dir,
 224        struct dentry   *dentry,
 225        unsigned int flags)
 226{
 227        struct xfs_inode *ip;
 228        struct xfs_name xname;
 229        struct xfs_name ci_name;
 230        struct qstr     dname;
 231        int             error;
 232
 233        if (dentry->d_name.len >= MAXNAMELEN)
 234                return ERR_PTR(-ENAMETOOLONG);
 235
 236        xfs_dentry_to_name(&xname, dentry);
 237        error = xfs_lookup(XFS_I(dir), &xname, &ip, &ci_name);
 238        if (unlikely(error)) {
 239                if (unlikely(error != ENOENT))
 240                        return ERR_PTR(-error);
 241                /*
 242                 * call d_add(dentry, NULL) here when d_drop_negative_children
 243                 * is called in xfs_vn_mknod (ie. allow negative dentries
 244                 * with CI filesystems).
 245                 */
 246                return NULL;
 247        }
 248
 249        /* if exact match, just splice and exit */
 250        if (!ci_name.name)
 251                return d_splice_alias(VFS_I(ip), dentry);
 252
 253        /* else case-insensitive match... */
 254        dname.name = ci_name.name;
 255        dname.len = ci_name.len;
 256        dentry = d_add_ci(dentry, VFS_I(ip), &dname);
 257        kmem_free(ci_name.name);
 258        return dentry;
 259}
 260
 261STATIC int
 262xfs_vn_link(
 263        struct dentry   *old_dentry,
 264        struct inode    *dir,
 265        struct dentry   *dentry)
 266{
 267        struct inode    *inode = old_dentry->d_inode;
 268        struct xfs_name name;
 269        int             error;
 270
 271        xfs_dentry_to_name(&name, dentry);
 272
 273        error = xfs_link(XFS_I(dir), XFS_I(inode), &name);
 274        if (unlikely(error))
 275                return -error;
 276
 277        ihold(inode);
 278        d_instantiate(dentry, inode);
 279        return 0;
 280}
 281
 282STATIC int
 283xfs_vn_unlink(
 284        struct inode    *dir,
 285        struct dentry   *dentry)
 286{
 287        struct xfs_name name;
 288        int             error;
 289
 290        xfs_dentry_to_name(&name, dentry);
 291
 292        error = -xfs_remove(XFS_I(dir), &name, XFS_I(dentry->d_inode));
 293        if (error)
 294                return error;
 295
 296        /*
 297         * With unlink, the VFS makes the dentry "negative": no inode,
 298         * but still hashed. This is incompatible with case-insensitive
 299         * mode, so invalidate (unhash) the dentry in CI-mode.
 300         */
 301        if (xfs_sb_version_hasasciici(&XFS_M(dir->i_sb)->m_sb))
 302                d_invalidate(dentry);
 303        return 0;
 304}
 305
 306STATIC int
 307xfs_vn_symlink(
 308        struct inode    *dir,
 309        struct dentry   *dentry,
 310        const char      *symname)
 311{
 312        struct inode    *inode;
 313        struct xfs_inode *cip = NULL;
 314        struct xfs_name name;
 315        int             error;
 316        umode_t         mode;
 317
 318        mode = S_IFLNK |
 319                (irix_symlink_mode ? 0777 & ~current_umask() : S_IRWXUGO);
 320        xfs_dentry_to_name(&name, dentry);
 321
 322        error = xfs_symlink(XFS_I(dir), &name, symname, mode, &cip);
 323        if (unlikely(error))
 324                goto out;
 325
 326        inode = VFS_I(cip);
 327
 328        error = xfs_init_security(inode, dir, &dentry->d_name);
 329        if (unlikely(error))
 330                goto out_cleanup_inode;
 331
 332        d_instantiate(dentry, inode);
 333        return 0;
 334
 335 out_cleanup_inode:
 336        xfs_cleanup_inode(dir, inode, dentry);
 337 out:
 338        return -error;
 339}
 340
 341STATIC int
 342xfs_vn_rename(
 343        struct inode    *odir,
 344        struct dentry   *odentry,
 345        struct inode    *ndir,
 346        struct dentry   *ndentry)
 347{
 348        struct inode    *new_inode = ndentry->d_inode;
 349        struct xfs_name oname;
 350        struct xfs_name nname;
 351
 352        xfs_dentry_to_name(&oname, odentry);
 353        xfs_dentry_to_name(&nname, ndentry);
 354
 355        return -xfs_rename(XFS_I(odir), &oname, XFS_I(odentry->d_inode),
 356                           XFS_I(ndir), &nname, new_inode ?
 357                                                XFS_I(new_inode) : NULL);
 358}
 359
 360/*
 361 * careful here - this function can get called recursively, so
 362 * we need to be very careful about how much stack we use.
 363 * uio is kmalloced for this reason...
 364 */
 365STATIC void *
 366xfs_vn_follow_link(
 367        struct dentry           *dentry,
 368        struct nameidata        *nd)
 369{
 370        char                    *link;
 371        int                     error = -ENOMEM;
 372
 373        link = kmalloc(MAXPATHLEN+1, GFP_KERNEL);
 374        if (!link)
 375                goto out_err;
 376
 377        error = -xfs_readlink(XFS_I(dentry->d_inode), link);
 378        if (unlikely(error))
 379                goto out_kfree;
 380
 381        nd_set_link(nd, link);
 382        return NULL;
 383
 384 out_kfree:
 385        kfree(link);
 386 out_err:
 387        nd_set_link(nd, ERR_PTR(error));
 388        return NULL;
 389}
 390
 391STATIC void
 392xfs_vn_put_link(
 393        struct dentry   *dentry,
 394        struct nameidata *nd,
 395        void            *p)
 396{
 397        char            *s = nd_get_link(nd);
 398
 399        if (!IS_ERR(s))
 400                kfree(s);
 401}
 402
 403STATIC int
 404xfs_vn_getattr(
 405        struct vfsmount         *mnt,
 406        struct dentry           *dentry,
 407        struct kstat            *stat)
 408{
 409        struct inode            *inode = dentry->d_inode;
 410        struct xfs_inode        *ip = XFS_I(inode);
 411        struct xfs_mount        *mp = ip->i_mount;
 412
 413        trace_xfs_getattr(ip);
 414
 415        if (XFS_FORCED_SHUTDOWN(mp))
 416                return -XFS_ERROR(EIO);
 417
 418        stat->size = XFS_ISIZE(ip);
 419        stat->dev = inode->i_sb->s_dev;
 420        stat->mode = ip->i_d.di_mode;
 421        stat->nlink = ip->i_d.di_nlink;
 422        stat->uid = ip->i_d.di_uid;
 423        stat->gid = ip->i_d.di_gid;
 424        stat->ino = ip->i_ino;
 425        stat->atime = inode->i_atime;
 426        stat->mtime = inode->i_mtime;
 427        stat->ctime = inode->i_ctime;
 428        stat->blocks =
 429                XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks);
 430
 431
 432        switch (inode->i_mode & S_IFMT) {
 433        case S_IFBLK:
 434        case S_IFCHR:
 435                stat->blksize = BLKDEV_IOSIZE;
 436                stat->rdev = MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
 437                                   sysv_minor(ip->i_df.if_u2.if_rdev));
 438                break;
 439        default:
 440                if (XFS_IS_REALTIME_INODE(ip)) {
 441                        /*
 442                         * If the file blocks are being allocated from a
 443                         * realtime volume, then return the inode's realtime
 444                         * extent size or the realtime volume's extent size.
 445                         */
 446                        stat->blksize =
 447                                xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog;
 448                } else
 449                        stat->blksize = xfs_preferred_iosize(mp);
 450                stat->rdev = 0;
 451                break;
 452        }
 453
 454        return 0;
 455}
 456
 457int
 458xfs_setattr_nonsize(
 459        struct xfs_inode        *ip,
 460        struct iattr            *iattr,
 461        int                     flags)
 462{
 463        xfs_mount_t             *mp = ip->i_mount;
 464        struct inode            *inode = VFS_I(ip);
 465        int                     mask = iattr->ia_valid;
 466        xfs_trans_t             *tp;
 467        int                     error;
 468        uid_t                   uid = 0, iuid = 0;
 469        gid_t                   gid = 0, igid = 0;
 470        struct xfs_dquot        *udqp = NULL, *gdqp = NULL;
 471        struct xfs_dquot        *olddquot1 = NULL, *olddquot2 = NULL;
 472
 473        trace_xfs_setattr(ip);
 474
 475        if (mp->m_flags & XFS_MOUNT_RDONLY)
 476                return XFS_ERROR(EROFS);
 477
 478        if (XFS_FORCED_SHUTDOWN(mp))
 479                return XFS_ERROR(EIO);
 480
 481        error = -inode_change_ok(inode, iattr);
 482        if (error)
 483                return XFS_ERROR(error);
 484
 485        ASSERT((mask & ATTR_SIZE) == 0);
 486
 487        /*
 488         * If disk quotas is on, we make sure that the dquots do exist on disk,
 489         * before we start any other transactions. Trying to do this later
 490         * is messy. We don't care to take a readlock to look at the ids
 491         * in inode here, because we can't hold it across the trans_reserve.
 492         * If the IDs do change before we take the ilock, we're covered
 493         * because the i_*dquot fields will get updated anyway.
 494         */
 495        if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) {
 496                uint    qflags = 0;
 497
 498                if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) {
 499                        uid = iattr->ia_uid;
 500                        qflags |= XFS_QMOPT_UQUOTA;
 501                } else {
 502                        uid = ip->i_d.di_uid;
 503                }
 504                if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) {
 505                        gid = iattr->ia_gid;
 506                        qflags |= XFS_QMOPT_GQUOTA;
 507                }  else {
 508                        gid = ip->i_d.di_gid;
 509                }
 510
 511                /*
 512                 * We take a reference when we initialize udqp and gdqp,
 513                 * so it is important that we never blindly double trip on
 514                 * the same variable. See xfs_create() for an example.
 515                 */
 516                ASSERT(udqp == NULL);
 517                ASSERT(gdqp == NULL);
 518                error = xfs_qm_vop_dqalloc(ip, uid, gid, xfs_get_projid(ip),
 519                                         qflags, &udqp, &gdqp);
 520                if (error)
 521                        return error;
 522        }
 523
 524        tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE);
 525        error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0);
 526        if (error)
 527                goto out_dqrele;
 528
 529        xfs_ilock(ip, XFS_ILOCK_EXCL);
 530
 531        /*
 532         * Change file ownership.  Must be the owner or privileged.
 533         */
 534        if (mask & (ATTR_UID|ATTR_GID)) {
 535                /*
 536                 * These IDs could have changed since we last looked at them.
 537                 * But, we're assured that if the ownership did change
 538                 * while we didn't have the inode locked, inode's dquot(s)
 539                 * would have changed also.
 540                 */
 541                iuid = ip->i_d.di_uid;
 542                igid = ip->i_d.di_gid;
 543                gid = (mask & ATTR_GID) ? iattr->ia_gid : igid;
 544                uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid;
 545
 546                /*
 547                 * Do a quota reservation only if uid/gid is actually
 548                 * going to change.
 549                 */
 550                if (XFS_IS_QUOTA_RUNNING(mp) &&
 551                    ((XFS_IS_UQUOTA_ON(mp) && iuid != uid) ||
 552                     (XFS_IS_GQUOTA_ON(mp) && igid != gid))) {
 553                        ASSERT(tp);
 554                        error = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp,
 555                                                capable(CAP_FOWNER) ?
 556                                                XFS_QMOPT_FORCE_RES : 0);
 557                        if (error)      /* out of quota */
 558                                goto out_trans_cancel;
 559                }
 560        }
 561
 562        xfs_trans_ijoin(tp, ip, 0);
 563
 564        /*
 565         * Change file ownership.  Must be the owner or privileged.
 566         */
 567        if (mask & (ATTR_UID|ATTR_GID)) {
 568                /*
 569                 * CAP_FSETID overrides the following restrictions:
 570                 *
 571                 * The set-user-ID and set-group-ID bits of a file will be
 572                 * cleared upon successful return from chown()
 573                 */
 574                if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) &&
 575                    !capable(CAP_FSETID))
 576                        ip->i_d.di_mode &= ~(S_ISUID|S_ISGID);
 577
 578                /*
 579                 * Change the ownerships and register quota modifications
 580                 * in the transaction.
 581                 */
 582                if (iuid != uid) {
 583                        if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) {
 584                                ASSERT(mask & ATTR_UID);
 585                                ASSERT(udqp);
 586                                olddquot1 = xfs_qm_vop_chown(tp, ip,
 587                                                        &ip->i_udquot, udqp);
 588                        }
 589                        ip->i_d.di_uid = uid;
 590                        inode->i_uid = uid;
 591                }
 592                if (igid != gid) {
 593                        if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) {
 594                                ASSERT(!XFS_IS_PQUOTA_ON(mp));
 595                                ASSERT(mask & ATTR_GID);
 596                                ASSERT(gdqp);
 597                                olddquot2 = xfs_qm_vop_chown(tp, ip,
 598                                                        &ip->i_gdquot, gdqp);
 599                        }
 600                        ip->i_d.di_gid = gid;
 601                        inode->i_gid = gid;
 602                }
 603        }
 604
 605        /*
 606         * Change file access modes.
 607         */
 608        if (mask & ATTR_MODE) {
 609                umode_t mode = iattr->ia_mode;
 610
 611                if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
 612                        mode &= ~S_ISGID;
 613
 614                ip->i_d.di_mode &= S_IFMT;
 615                ip->i_d.di_mode |= mode & ~S_IFMT;
 616
 617                inode->i_mode &= S_IFMT;
 618                inode->i_mode |= mode & ~S_IFMT;
 619        }
 620
 621        /*
 622         * Change file access or modified times.
 623         */
 624        if (mask & ATTR_ATIME) {
 625                inode->i_atime = iattr->ia_atime;
 626                ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec;
 627                ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec;
 628        }
 629        if (mask & ATTR_CTIME) {
 630                inode->i_ctime = iattr->ia_ctime;
 631                ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec;
 632                ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec;
 633        }
 634        if (mask & ATTR_MTIME) {
 635                inode->i_mtime = iattr->ia_mtime;
 636                ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec;
 637                ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec;
 638        }
 639
 640        xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 641
 642        XFS_STATS_INC(xs_ig_attrchg);
 643
 644        if (mp->m_flags & XFS_MOUNT_WSYNC)
 645                xfs_trans_set_sync(tp);
 646        error = xfs_trans_commit(tp, 0);
 647
 648        xfs_iunlock(ip, XFS_ILOCK_EXCL);
 649
 650        /*
 651         * Release any dquot(s) the inode had kept before chown.
 652         */
 653        xfs_qm_dqrele(olddquot1);
 654        xfs_qm_dqrele(olddquot2);
 655        xfs_qm_dqrele(udqp);
 656        xfs_qm_dqrele(gdqp);
 657
 658        if (error)
 659                return XFS_ERROR(error);
 660
 661        /*
 662         * XXX(hch): Updating the ACL entries is not atomic vs the i_mode
 663         *           update.  We could avoid this with linked transactions
 664         *           and passing down the transaction pointer all the way
 665         *           to attr_set.  No previous user of the generic
 666         *           Posix ACL code seems to care about this issue either.
 667         */
 668        if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) {
 669                error = -xfs_acl_chmod(inode);
 670                if (error)
 671                        return XFS_ERROR(error);
 672        }
 673
 674        return 0;
 675
 676out_trans_cancel:
 677        xfs_trans_cancel(tp, 0);
 678        xfs_iunlock(ip, XFS_ILOCK_EXCL);
 679out_dqrele:
 680        xfs_qm_dqrele(udqp);
 681        xfs_qm_dqrele(gdqp);
 682        return error;
 683}
 684
 685/*
 686 * Truncate file.  Must have write permission and not be a directory.
 687 */
 688int
 689xfs_setattr_size(
 690        struct xfs_inode        *ip,
 691        struct iattr            *iattr,
 692        int                     flags)
 693{
 694        struct xfs_mount        *mp = ip->i_mount;
 695        struct inode            *inode = VFS_I(ip);
 696        int                     mask = iattr->ia_valid;
 697        xfs_off_t               oldsize, newsize;
 698        struct xfs_trans        *tp;
 699        int                     error;
 700        uint                    lock_flags = 0;
 701        uint                    commit_flags = 0;
 702
 703        trace_xfs_setattr(ip);
 704
 705        if (mp->m_flags & XFS_MOUNT_RDONLY)
 706                return XFS_ERROR(EROFS);
 707
 708        if (XFS_FORCED_SHUTDOWN(mp))
 709                return XFS_ERROR(EIO);
 710
 711        error = -inode_change_ok(inode, iattr);
 712        if (error)
 713                return XFS_ERROR(error);
 714
 715        ASSERT(S_ISREG(ip->i_d.di_mode));
 716        ASSERT((mask & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_ATIME_SET|
 717                        ATTR_MTIME_SET|ATTR_KILL_SUID|ATTR_KILL_SGID|
 718                        ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
 719
 720        if (!(flags & XFS_ATTR_NOLOCK)) {
 721                lock_flags |= XFS_IOLOCK_EXCL;
 722                xfs_ilock(ip, lock_flags);
 723        }
 724
 725        oldsize = inode->i_size;
 726        newsize = iattr->ia_size;
 727
 728        /*
 729         * Short circuit the truncate case for zero length files.
 730         */
 731        if (newsize == 0 && oldsize == 0 && ip->i_d.di_nextents == 0) {
 732                if (!(mask & (ATTR_CTIME|ATTR_MTIME)))
 733                        goto out_unlock;
 734
 735                /*
 736                 * Use the regular setattr path to update the timestamps.
 737                 */
 738                xfs_iunlock(ip, lock_flags);
 739                iattr->ia_valid &= ~ATTR_SIZE;
 740                return xfs_setattr_nonsize(ip, iattr, 0);
 741        }
 742
 743        /*
 744         * Make sure that the dquots are attached to the inode.
 745         */
 746        error = xfs_qm_dqattach(ip, 0);
 747        if (error)
 748                goto out_unlock;
 749
 750        /*
 751         * Now we can make the changes.  Before we join the inode to the
 752         * transaction, take care of the part of the truncation that must be
 753         * done without the inode lock.  This needs to be done before joining
 754         * the inode to the transaction, because the inode cannot be unlocked
 755         * once it is a part of the transaction.
 756         */
 757        if (newsize > oldsize) {
 758                /*
 759                 * Do the first part of growing a file: zero any data in the
 760                 * last block that is beyond the old EOF.  We need to do this
 761                 * before the inode is joined to the transaction to modify
 762                 * i_size.
 763                 */
 764                error = xfs_zero_eof(ip, newsize, oldsize);
 765                if (error)
 766                        goto out_unlock;
 767        }
 768
 769        /*
 770         * We are going to log the inode size change in this transaction so
 771         * any previous writes that are beyond the on disk EOF and the new
 772         * EOF that have not been written out need to be written here.  If we
 773         * do not write the data out, we expose ourselves to the null files
 774         * problem.
 775         *
 776         * Only flush from the on disk size to the smaller of the in memory
 777         * file size or the new size as that's the range we really care about
 778         * here and prevents waiting for other data not within the range we
 779         * care about here.
 780         */
 781        if (oldsize != ip->i_d.di_size && newsize > ip->i_d.di_size) {
 782                error = xfs_flush_pages(ip, ip->i_d.di_size, newsize, 0,
 783                                        FI_NONE);
 784                if (error)
 785                        goto out_unlock;
 786        }
 787
 788        /*
 789         * Wait for all direct I/O to complete.
 790         */
 791        inode_dio_wait(inode);
 792
 793        error = -block_truncate_page(inode->i_mapping, newsize, xfs_get_blocks);
 794        if (error)
 795                goto out_unlock;
 796
 797        tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE);
 798        error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0,
 799                                 XFS_TRANS_PERM_LOG_RES,
 800                                 XFS_ITRUNCATE_LOG_COUNT);
 801        if (error)
 802                goto out_trans_cancel;
 803
 804        truncate_setsize(inode, newsize);
 805
 806        commit_flags = XFS_TRANS_RELEASE_LOG_RES;
 807        lock_flags |= XFS_ILOCK_EXCL;
 808
 809        xfs_ilock(ip, XFS_ILOCK_EXCL);
 810
 811        xfs_trans_ijoin(tp, ip, 0);
 812
 813        /*
 814         * Only change the c/mtime if we are changing the size or we are
 815         * explicitly asked to change it.  This handles the semantic difference
 816         * between truncate() and ftruncate() as implemented in the VFS.
 817         *
 818         * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
 819         * special case where we need to update the times despite not having
 820         * these flags set.  For all other operations the VFS set these flags
 821         * explicitly if it wants a timestamp update.
 822         */
 823        if (newsize != oldsize && (!(mask & (ATTR_CTIME | ATTR_MTIME)))) {
 824                iattr->ia_ctime = iattr->ia_mtime =
 825                        current_fs_time(inode->i_sb);
 826                mask |= ATTR_CTIME | ATTR_MTIME;
 827        }
 828
 829        /*
 830         * The first thing we do is set the size to new_size permanently on
 831         * disk.  This way we don't have to worry about anyone ever being able
 832         * to look at the data being freed even in the face of a crash.
 833         * What we're getting around here is the case where we free a block, it
 834         * is allocated to another file, it is written to, and then we crash.
 835         * If the new data gets written to the file but the log buffers
 836         * containing the free and reallocation don't, then we'd end up with
 837         * garbage in the blocks being freed.  As long as we make the new size
 838         * permanent before actually freeing any blocks it doesn't matter if
 839         * they get written to.
 840         */
 841        ip->i_d.di_size = newsize;
 842        xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 843
 844        if (newsize <= oldsize) {
 845                error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, newsize);
 846                if (error)
 847                        goto out_trans_abort;
 848
 849                /*
 850                 * Truncated "down", so we're removing references to old data
 851                 * here - if we delay flushing for a long time, we expose
 852                 * ourselves unduly to the notorious NULL files problem.  So,
 853                 * we mark this inode and flush it when the file is closed,
 854                 * and do not wait the usual (long) time for writeout.
 855                 */
 856                xfs_iflags_set(ip, XFS_ITRUNCATED);
 857        }
 858
 859        if (mask & ATTR_CTIME) {
 860                inode->i_ctime = iattr->ia_ctime;
 861                ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec;
 862                ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec;
 863        }
 864        if (mask & ATTR_MTIME) {
 865                inode->i_mtime = iattr->ia_mtime;
 866                ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec;
 867                ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec;
 868        }
 869
 870        xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 871
 872        XFS_STATS_INC(xs_ig_attrchg);
 873
 874        if (mp->m_flags & XFS_MOUNT_WSYNC)
 875                xfs_trans_set_sync(tp);
 876
 877        error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
 878out_unlock:
 879        if (lock_flags)
 880                xfs_iunlock(ip, lock_flags);
 881        return error;
 882
 883out_trans_abort:
 884        commit_flags |= XFS_TRANS_ABORT;
 885out_trans_cancel:
 886        xfs_trans_cancel(tp, commit_flags);
 887        goto out_unlock;
 888}
 889
 890STATIC int
 891xfs_vn_setattr(
 892        struct dentry   *dentry,
 893        struct iattr    *iattr)
 894{
 895        if (iattr->ia_valid & ATTR_SIZE)
 896                return -xfs_setattr_size(XFS_I(dentry->d_inode), iattr, 0);
 897        return -xfs_setattr_nonsize(XFS_I(dentry->d_inode), iattr, 0);
 898}
 899
 900STATIC int
 901xfs_vn_update_time(
 902        struct inode            *inode,
 903        struct timespec         *now,
 904        int                     flags)
 905{
 906        struct xfs_inode        *ip = XFS_I(inode);
 907        struct xfs_mount        *mp = ip->i_mount;
 908        struct xfs_trans        *tp;
 909        int                     error;
 910
 911        trace_xfs_update_time(ip);
 912
 913        tp = xfs_trans_alloc(mp, XFS_TRANS_FSYNC_TS);
 914        error = xfs_trans_reserve(tp, 0, XFS_FSYNC_TS_LOG_RES(mp), 0, 0, 0);
 915        if (error) {
 916                xfs_trans_cancel(tp, 0);
 917                return -error;
 918        }
 919
 920        xfs_ilock(ip, XFS_ILOCK_EXCL);
 921        if (flags & S_CTIME) {
 922                inode->i_ctime = *now;
 923                ip->i_d.di_ctime.t_sec = (__int32_t)now->tv_sec;
 924                ip->i_d.di_ctime.t_nsec = (__int32_t)now->tv_nsec;
 925        }
 926        if (flags & S_MTIME) {
 927                inode->i_mtime = *now;
 928                ip->i_d.di_mtime.t_sec = (__int32_t)now->tv_sec;
 929                ip->i_d.di_mtime.t_nsec = (__int32_t)now->tv_nsec;
 930        }
 931        if (flags & S_ATIME) {
 932                inode->i_atime = *now;
 933                ip->i_d.di_atime.t_sec = (__int32_t)now->tv_sec;
 934                ip->i_d.di_atime.t_nsec = (__int32_t)now->tv_nsec;
 935        }
 936        xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
 937        xfs_trans_log_inode(tp, ip, XFS_ILOG_TIMESTAMP);
 938        return -xfs_trans_commit(tp, 0);
 939}
 940
 941#define XFS_FIEMAP_FLAGS        (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
 942
 943/*
 944 * Call fiemap helper to fill in user data.
 945 * Returns positive errors to xfs_getbmap.
 946 */
 947STATIC int
 948xfs_fiemap_format(
 949        void                    **arg,
 950        struct getbmapx         *bmv,
 951        int                     *full)
 952{
 953        int                     error;
 954        struct fiemap_extent_info *fieinfo = *arg;
 955        u32                     fiemap_flags = 0;
 956        u64                     logical, physical, length;
 957
 958        /* Do nothing for a hole */
 959        if (bmv->bmv_block == -1LL)
 960                return 0;
 961
 962        logical = BBTOB(bmv->bmv_offset);
 963        physical = BBTOB(bmv->bmv_block);
 964        length = BBTOB(bmv->bmv_length);
 965
 966        if (bmv->bmv_oflags & BMV_OF_PREALLOC)
 967                fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN;
 968        else if (bmv->bmv_oflags & BMV_OF_DELALLOC) {
 969                fiemap_flags |= FIEMAP_EXTENT_DELALLOC;
 970                physical = 0;   /* no block yet */
 971        }
 972        if (bmv->bmv_oflags & BMV_OF_LAST)
 973                fiemap_flags |= FIEMAP_EXTENT_LAST;
 974
 975        error = fiemap_fill_next_extent(fieinfo, logical, physical,
 976                                        length, fiemap_flags);
 977        if (error > 0) {
 978                error = 0;
 979                *full = 1;      /* user array now full */
 980        }
 981
 982        return -error;
 983}
 984
 985STATIC int
 986xfs_vn_fiemap(
 987        struct inode            *inode,
 988        struct fiemap_extent_info *fieinfo,
 989        u64                     start,
 990        u64                     length)
 991{
 992        xfs_inode_t             *ip = XFS_I(inode);
 993        struct getbmapx         bm;
 994        int                     error;
 995
 996        error = fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS);
 997        if (error)
 998                return error;
 999
1000        /* Set up bmap header for xfs internal routine */
1001        bm.bmv_offset = BTOBB(start);
1002        /* Special case for whole file */
1003        if (length == FIEMAP_MAX_OFFSET)
1004                bm.bmv_length = -1LL;
1005        else
1006                bm.bmv_length = BTOBB(length);
1007
1008        /* We add one because in getbmap world count includes the header */
1009        bm.bmv_count = !fieinfo->fi_extents_max ? MAXEXTNUM :
1010                                        fieinfo->fi_extents_max + 1;
1011        bm.bmv_count = min_t(__s32, bm.bmv_count,
1012                             (PAGE_SIZE * 16 / sizeof(struct getbmapx)));
1013        bm.bmv_iflags = BMV_IF_PREALLOC | BMV_IF_NO_HOLES;
1014        if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR)
1015                bm.bmv_iflags |= BMV_IF_ATTRFORK;
1016        if (!(fieinfo->fi_flags & FIEMAP_FLAG_SYNC))
1017                bm.bmv_iflags |= BMV_IF_DELALLOC;
1018
1019        error = xfs_getbmap(ip, &bm, xfs_fiemap_format, fieinfo);
1020        if (error)
1021                return -error;
1022
1023        return 0;
1024}
1025
1026static const struct inode_operations xfs_inode_operations = {
1027        .get_acl                = xfs_get_acl,
1028        .getattr                = xfs_vn_getattr,
1029        .setattr                = xfs_vn_setattr,
1030        .setxattr               = generic_setxattr,
1031        .getxattr               = generic_getxattr,
1032        .removexattr            = generic_removexattr,
1033        .listxattr              = xfs_vn_listxattr,
1034        .fiemap                 = xfs_vn_fiemap,
1035        .update_time            = xfs_vn_update_time,
1036};
1037
1038static const struct inode_operations xfs_dir_inode_operations = {
1039        .create                 = xfs_vn_create,
1040        .lookup                 = xfs_vn_lookup,
1041        .link                   = xfs_vn_link,
1042        .unlink                 = xfs_vn_unlink,
1043        .symlink                = xfs_vn_symlink,
1044        .mkdir                  = xfs_vn_mkdir,
1045        /*
1046         * Yes, XFS uses the same method for rmdir and unlink.
1047         *
1048         * There are some subtile differences deeper in the code,
1049         * but we use S_ISDIR to check for those.
1050         */
1051        .rmdir                  = xfs_vn_unlink,
1052        .mknod                  = xfs_vn_mknod,
1053        .rename                 = xfs_vn_rename,
1054        .get_acl                = xfs_get_acl,
1055        .getattr                = xfs_vn_getattr,
1056        .setattr                = xfs_vn_setattr,
1057        .setxattr               = generic_setxattr,
1058        .getxattr               = generic_getxattr,
1059        .removexattr            = generic_removexattr,
1060        .listxattr              = xfs_vn_listxattr,
1061        .update_time            = xfs_vn_update_time,
1062};
1063
1064static const struct inode_operations xfs_dir_ci_inode_operations = {
1065        .create                 = xfs_vn_create,
1066        .lookup                 = xfs_vn_ci_lookup,
1067        .link                   = xfs_vn_link,
1068        .unlink                 = xfs_vn_unlink,
1069        .symlink                = xfs_vn_symlink,
1070        .mkdir                  = xfs_vn_mkdir,
1071        /*
1072         * Yes, XFS uses the same method for rmdir and unlink.
1073         *
1074         * There are some subtile differences deeper in the code,
1075         * but we use S_ISDIR to check for those.
1076         */
1077        .rmdir                  = xfs_vn_unlink,
1078        .mknod                  = xfs_vn_mknod,
1079        .rename                 = xfs_vn_rename,
1080        .get_acl                = xfs_get_acl,
1081        .getattr                = xfs_vn_getattr,
1082        .setattr                = xfs_vn_setattr,
1083        .setxattr               = generic_setxattr,
1084        .getxattr               = generic_getxattr,
1085        .removexattr            = generic_removexattr,
1086        .listxattr              = xfs_vn_listxattr,
1087        .update_time            = xfs_vn_update_time,
1088};
1089
1090static const struct inode_operations xfs_symlink_inode_operations = {
1091        .readlink               = generic_readlink,
1092        .follow_link            = xfs_vn_follow_link,
1093        .put_link               = xfs_vn_put_link,
1094        .get_acl                = xfs_get_acl,
1095        .getattr                = xfs_vn_getattr,
1096        .setattr                = xfs_vn_setattr,
1097        .setxattr               = generic_setxattr,
1098        .getxattr               = generic_getxattr,
1099        .removexattr            = generic_removexattr,
1100        .listxattr              = xfs_vn_listxattr,
1101        .update_time            = xfs_vn_update_time,
1102};
1103
1104STATIC void
1105xfs_diflags_to_iflags(
1106        struct inode            *inode,
1107        struct xfs_inode        *ip)
1108{
1109        if (ip->i_d.di_flags & XFS_DIFLAG_IMMUTABLE)
1110                inode->i_flags |= S_IMMUTABLE;
1111        else
1112                inode->i_flags &= ~S_IMMUTABLE;
1113        if (ip->i_d.di_flags & XFS_DIFLAG_APPEND)
1114                inode->i_flags |= S_APPEND;
1115        else
1116                inode->i_flags &= ~S_APPEND;
1117        if (ip->i_d.di_flags & XFS_DIFLAG_SYNC)
1118                inode->i_flags |= S_SYNC;
1119        else
1120                inode->i_flags &= ~S_SYNC;
1121        if (ip->i_d.di_flags & XFS_DIFLAG_NOATIME)
1122                inode->i_flags |= S_NOATIME;
1123        else
1124                inode->i_flags &= ~S_NOATIME;
1125}
1126
1127/*
1128 * Initialize the Linux inode, set up the operation vectors and
1129 * unlock the inode.
1130 *
1131 * When reading existing inodes from disk this is called directly
1132 * from xfs_iget, when creating a new inode it is called from
1133 * xfs_ialloc after setting up the inode.
1134 *
1135 * We are always called with an uninitialised linux inode here.
1136 * We need to initialise the necessary fields and take a reference
1137 * on it.
1138 */
1139void
1140xfs_setup_inode(
1141        struct xfs_inode        *ip)
1142{
1143        struct inode            *inode = &ip->i_vnode;
1144
1145        inode->i_ino = ip->i_ino;
1146        inode->i_state = I_NEW;
1147
1148        inode_sb_list_add(inode);
1149        /* make the inode look hashed for the writeback code */
1150        hlist_add_fake(&inode->i_hash);
1151
1152        inode->i_mode   = ip->i_d.di_mode;
1153        set_nlink(inode, ip->i_d.di_nlink);
1154        inode->i_uid    = ip->i_d.di_uid;
1155        inode->i_gid    = ip->i_d.di_gid;
1156
1157        switch (inode->i_mode & S_IFMT) {
1158        case S_IFBLK:
1159        case S_IFCHR:
1160                inode->i_rdev =
1161                        MKDEV(sysv_major(ip->i_df.if_u2.if_rdev) & 0x1ff,
1162                              sysv_minor(ip->i_df.if_u2.if_rdev));
1163                break;
1164        default:
1165                inode->i_rdev = 0;
1166                break;
1167        }
1168
1169        inode->i_generation = ip->i_d.di_gen;
1170        i_size_write(inode, ip->i_d.di_size);
1171        inode->i_atime.tv_sec   = ip->i_d.di_atime.t_sec;
1172        inode->i_atime.tv_nsec  = ip->i_d.di_atime.t_nsec;
1173        inode->i_mtime.tv_sec   = ip->i_d.di_mtime.t_sec;
1174        inode->i_mtime.tv_nsec  = ip->i_d.di_mtime.t_nsec;
1175        inode->i_ctime.tv_sec   = ip->i_d.di_ctime.t_sec;
1176        inode->i_ctime.tv_nsec  = ip->i_d.di_ctime.t_nsec;
1177        xfs_diflags_to_iflags(inode, ip);
1178
1179        switch (inode->i_mode & S_IFMT) {
1180        case S_IFREG:
1181                inode->i_op = &xfs_inode_operations;
1182                inode->i_fop = &xfs_file_operations;
1183                inode->i_mapping->a_ops = &xfs_address_space_operations;
1184                break;
1185        case S_IFDIR:
1186                if (xfs_sb_version_hasasciici(&XFS_M(inode->i_sb)->m_sb))
1187                        inode->i_op = &xfs_dir_ci_inode_operations;
1188                else
1189                        inode->i_op = &xfs_dir_inode_operations;
1190                inode->i_fop = &xfs_dir_file_operations;
1191                break;
1192        case S_IFLNK:
1193                inode->i_op = &xfs_symlink_inode_operations;
1194                if (!(ip->i_df.if_flags & XFS_IFINLINE))
1195                        inode->i_mapping->a_ops = &xfs_address_space_operations;
1196                break;
1197        default:
1198                inode->i_op = &xfs_inode_operations;
1199                init_special_inode(inode, inode->i_mode, inode->i_rdev);
1200                break;
1201        }
1202
1203        /*
1204         * If there is no attribute fork no ACL can exist on this inode,
1205         * and it can't have any file capabilities attached to it either.
1206         */
1207        if (!XFS_IFORK_Q(ip)) {
1208                inode_has_no_xattr(inode);
1209                cache_no_acl(inode);
1210        }
1211
1212        xfs_iflags_clear(ip, XFS_INEW);
1213        barrier();
1214
1215        unlock_new_inode(inode);
1216}
1217
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