err.no Git - linux-2.6/blob - fs/xfs/linux-2.6/xfs_file.c

   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_bit.h"
  20 #include "xfs_log.h"
  21 #include "xfs_inum.h"
  22 #include "xfs_sb.h"
  23 #include "xfs_ag.h"
  24 #include "xfs_dir.h"
  25 #include "xfs_dir2.h"
  26 #include "xfs_trans.h"
  27 #include "xfs_dmapi.h"
  28 #include "xfs_mount.h"
  29 #include "xfs_bmap_btree.h"
  30 #include "xfs_alloc_btree.h"
  31 #include "xfs_ialloc_btree.h"
  32 #include "xfs_alloc.h"
  33 #include "xfs_btree.h"
  34 #include "xfs_attr_sf.h"
  35 #include "xfs_dir_sf.h"
  36 #include "xfs_dir2_sf.h"
  37 #include "xfs_dinode.h"
  38 #include "xfs_inode.h"
  39 #include "xfs_error.h"
  40 #include "xfs_rw.h"
  41 #include "xfs_ioctl32.h"
  42
  43 #include <linux/dcache.h>
  44 #include <linux/smp_lock.h>
  45
  46 static struct vm_operations_struct xfs_file_vm_ops;
  47 #ifdef CONFIG_XFS_DMAPI
  48 static struct vm_operations_struct xfs_dmapi_file_vm_ops;
  49 #endif
  50
  51 STATIC inline ssize_t
  52 __xfs_file_read(
  53         struct kiocb            *iocb,
  54         char                    __user *buf,
  55         int                     ioflags,
  56         size_t                  count,
  57         loff_t                  pos)
  58 {
  59         struct iovec            iov = {buf, count};
  60         struct file             *file = iocb->ki_filp;
  61         bhv_vnode_t             *vp = vn_from_inode(file->f_dentry->d_inode);
  62
  63         BUG_ON(iocb->ki_pos != pos);
  64         if (unlikely(file->f_flags & O_DIRECT))
  65                 ioflags |= IO_ISDIRECT;
  66         return bhv_vop_read(vp, iocb, &iov, 1, &iocb->ki_pos, ioflags, NULL);
  67 }
  68
  69 STATIC ssize_t
  70 xfs_file_aio_read(
  71         struct kiocb            *iocb,
  72         char                    __user *buf,
  73         size_t                  count,
  74         loff_t                  pos)
  75 {
  76         return __xfs_file_read(iocb, buf, IO_ISAIO, count, pos);
  77 }
  78
  79 STATIC ssize_t
  80 xfs_file_aio_read_invis(
  81         struct kiocb            *iocb,
  82         char                    __user *buf,
  83         size_t                  count,
  84         loff_t                  pos)
  85 {
  86         return __xfs_file_read(iocb, buf, IO_ISAIO|IO_INVIS, count, pos);
  87 }
  88
  89 STATIC inline ssize_t
  90 __xfs_file_write(
  91         struct kiocb    *iocb,
  92         const char      __user *buf,
  93         int             ioflags,
  94         size_t          count,
  95         loff_t          pos)
  96 {
  97         struct iovec    iov = {(void __user *)buf, count};
  98         struct file     *file = iocb->ki_filp;
  99         struct inode    *inode = file->f_mapping->host;
 100         bhv_vnode_t     *vp = vn_from_inode(inode);
 101
 102         BUG_ON(iocb->ki_pos != pos);
 103         if (unlikely(file->f_flags & O_DIRECT))
 104                 ioflags |= IO_ISDIRECT;
 105         return bhv_vop_write(vp, iocb, &iov, 1, &iocb->ki_pos, ioflags, NULL);
 106 }
 107
 108 STATIC ssize_t
 109 xfs_file_aio_write(
 110         struct kiocb            *iocb,
 111         const char              __user *buf,
 112         size_t                  count,
 113         loff_t                  pos)
 114 {
 115         return __xfs_file_write(iocb, buf, IO_ISAIO, count, pos);
 116 }
 117
 118 STATIC ssize_t
 119 xfs_file_aio_write_invis(
 120         struct kiocb            *iocb,
 121         const char              __user *buf,
 122         size_t                  count,
 123         loff_t                  pos)
 124 {
 125         return __xfs_file_write(iocb, buf, IO_ISAIO|IO_INVIS, count, pos);
 126 }
 127
 128 STATIC inline ssize_t
 129 __xfs_file_readv(
 130         struct file             *file,
 131         const struct iovec      *iov,
 132         int                     ioflags,
 133         unsigned long           nr_segs,
 134         loff_t                  *ppos)
 135 {
 136         struct inode    *inode = file->f_mapping->host;
 137         bhv_vnode_t     *vp = vn_from_inode(inode);
 138         struct kiocb    kiocb;
 139         ssize_t         rval;
 140
 141         init_sync_kiocb(&kiocb, file);
 142         kiocb.ki_pos = *ppos;
 143
 144         if (unlikely(file->f_flags & O_DIRECT))
 145                 ioflags |= IO_ISDIRECT;
 146         rval = bhv_vop_read(vp, &kiocb, iov, nr_segs,
 147                                 &kiocb.ki_pos, ioflags, NULL);
 148
 149         *ppos = kiocb.ki_pos;
 150         return rval;
 151 }
 152
 153 STATIC ssize_t
 154 xfs_file_readv(
 155         struct file             *file,
 156         const struct iovec      *iov,
 157         unsigned long           nr_segs,
 158         loff_t                  *ppos)
 159 {
 160         return __xfs_file_readv(file, iov, 0, nr_segs, ppos);
 161 }
 162
 163 STATIC ssize_t
 164 xfs_file_readv_invis(
 165         struct file             *file,
 166         const struct iovec      *iov,
 167         unsigned long           nr_segs,
 168         loff_t                  *ppos)
 169 {
 170         return __xfs_file_readv(file, iov, IO_INVIS, nr_segs, ppos);
 171 }
 172
 173 STATIC inline ssize_t
 174 __xfs_file_writev(
 175         struct file             *file,
 176         const struct iovec      *iov,
 177         int                     ioflags,
 178         unsigned long           nr_segs,
 179         loff_t                  *ppos)
 180 {
 181         struct inode    *inode = file->f_mapping->host;
 182         bhv_vnode_t     *vp = vn_from_inode(inode);
 183         struct kiocb    kiocb;
 184         ssize_t         rval;
 185
 186         init_sync_kiocb(&kiocb, file);
 187         kiocb.ki_pos = *ppos;
 188         if (unlikely(file->f_flags & O_DIRECT))
 189                 ioflags |= IO_ISDIRECT;
 190
 191         rval = bhv_vop_write(vp, &kiocb, iov, nr_segs,
 192                                  &kiocb.ki_pos, ioflags, NULL);
 193
 194         *ppos = kiocb.ki_pos;
 195         return rval;
 196 }
 197
 198 STATIC ssize_t
 199 xfs_file_writev(
 200         struct file             *file,
 201         const struct iovec      *iov,
 202         unsigned long           nr_segs,
 203         loff_t                  *ppos)
 204 {
 205         return __xfs_file_writev(file, iov, 0, nr_segs, ppos);
 206 }
 207
 208 STATIC ssize_t
 209 xfs_file_writev_invis(
 210         struct file             *file,
 211         const struct iovec      *iov,
 212         unsigned long           nr_segs,
 213         loff_t                  *ppos)
 214 {
 215         return __xfs_file_writev(file, iov, IO_INVIS, nr_segs, ppos);
 216 }
 217
 218 STATIC ssize_t
 219 xfs_file_sendfile(
 220         struct file             *filp,
 221         loff_t                  *pos,
 222         size_t                  count,
 223         read_actor_t            actor,
 224         void                    *target)
 225 {
 226         return bhv_vop_sendfile(vn_from_inode(filp->f_dentry->d_inode),
 227                                 filp, pos, 0, count, actor, target, NULL);
 228 }
 229
 230 STATIC ssize_t
 231 xfs_file_sendfile_invis(
 232         struct file             *filp,
 233         loff_t                  *pos,
 234         size_t                  count,
 235         read_actor_t            actor,
 236         void                    *target)
 237 {
 238         return bhv_vop_sendfile(vn_from_inode(filp->f_dentry->d_inode),
 239                                 filp, pos, IO_INVIS, count, actor, target, NULL);
 240 }
 241
 242 STATIC ssize_t
 243 xfs_file_splice_read(
 244         struct file             *infilp,
 245         loff_t                  *ppos,
 246         struct pipe_inode_info  *pipe,
 247         size_t                  len,
 248         unsigned int            flags)
 249 {
 250         return bhv_vop_splice_read(vn_from_inode(infilp->f_dentry->d_inode),
 251                                    infilp, ppos, pipe, len, flags, 0, NULL);
 252 }
 253
 254 STATIC ssize_t
 255 xfs_file_splice_read_invis(
 256         struct file             *infilp,
 257         loff_t                  *ppos,
 258         struct pipe_inode_info  *pipe,
 259         size_t                  len,
 260         unsigned int            flags)
 261 {
 262         return bhv_vop_splice_read(vn_from_inode(infilp->f_dentry->d_inode),
 263                                    infilp, ppos, pipe, len, flags, IO_INVIS,
 264                                    NULL);
 265 }
 266
 267 STATIC ssize_t
 268 xfs_file_splice_write(
 269         struct pipe_inode_info  *pipe,
 270         struct file             *outfilp,
 271         loff_t                  *ppos,
 272         size_t                  len,
 273         unsigned int            flags)
 274 {
 275         return bhv_vop_splice_write(vn_from_inode(outfilp->f_dentry->d_inode),
 276                                     pipe, outfilp, ppos, len, flags, 0, NULL);
 277 }
 278
 279 STATIC ssize_t
 280 xfs_file_splice_write_invis(
 281         struct pipe_inode_info  *pipe,
 282         struct file             *outfilp,
 283         loff_t                  *ppos,
 284         size_t                  len,
 285         unsigned int            flags)
 286 {
 287         return bhv_vop_splice_write(vn_from_inode(outfilp->f_dentry->d_inode),
 288                                     pipe, outfilp, ppos, len, flags, IO_INVIS,
 289                                     NULL);
 290 }
 291
 292 STATIC int
 293 xfs_file_open(
 294         struct inode    *inode,
 295         struct file     *filp)
 296 {
 297         if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
 298                 return -EFBIG;
 299         return -bhv_vop_open(vn_from_inode(inode), NULL);
 300 }
 301
 302 STATIC int
 303 xfs_file_close(
 304         struct file     *filp)
 305 {
 306         return -bhv_vop_close(vn_from_inode(filp->f_dentry->d_inode), 0,
 307                                 file_count(filp) > 1 ? L_FALSE : L_TRUE, NULL);
 308 }
 309
 310 STATIC int
 311 xfs_file_release(
 312         struct inode    *inode,
 313         struct file     *filp)
 314 {
 315         bhv_vnode_t     *vp = vn_from_inode(inode);
 316
 317         if (vp)
 318                 return -bhv_vop_release(vp);
 319         return 0;
 320 }
 321
 322 STATIC int
 323 xfs_file_fsync(
 324         struct file     *filp,
 325         struct dentry   *dentry,
 326         int             datasync)
 327 {
 328         bhv_vnode_t     *vp = vn_from_inode(dentry->d_inode);
 329         int             flags = FSYNC_WAIT;
 330
 331         if (datasync)
 332                 flags |= FSYNC_DATA;
 333         if (VN_TRUNC(vp))
 334                 VUNTRUNCATE(vp);
 335         return -bhv_vop_fsync(vp, flags, NULL, (xfs_off_t)0, (xfs_off_t)-1);
 336 }
 337
 338 #ifdef CONFIG_XFS_DMAPI
 339 STATIC struct page *
 340 xfs_vm_nopage(
 341         struct vm_area_struct   *area,
 342         unsigned long           address,
 343         int                     *type)
 344 {
 345         struct inode    *inode = area->vm_file->f_dentry->d_inode;
 346         bhv_vnode_t     *vp = vn_from_inode(inode);
 347
 348         ASSERT_ALWAYS(vp->v_vfsp->vfs_flag & VFS_DMI);
 349         if (XFS_SEND_MMAP(XFS_VFSTOM(vp->v_vfsp), area, 0))
 350                 return NULL;
 351         return filemap_nopage(area, address, type);
 352 }
 353 #endif /* CONFIG_XFS_DMAPI */
 354
 355 STATIC int
 356 xfs_file_readdir(
 357         struct file     *filp,
 358         void            *dirent,
 359         filldir_t       filldir)
 360 {
 361         int             error = 0;
 362         bhv_vnode_t     *vp = vn_from_inode(filp->f_dentry->d_inode);
 363         uio_t           uio;
 364         iovec_t         iov;
 365         int             eof = 0;
 366         caddr_t         read_buf;
 367         int             namelen, size = 0;
 368         size_t          rlen = PAGE_CACHE_SIZE;
 369         xfs_off_t       start_offset, curr_offset;
 370         xfs_dirent_t    *dbp = NULL;
 371
 372         /* Try fairly hard to get memory */
 373         do {
 374                 if ((read_buf = (caddr_t)kmalloc(rlen, GFP_KERNEL)))
 375                         break;
 376                 rlen >>= 1;
 377         } while (rlen >= 1024);
 378
 379         if (read_buf == NULL)
 380                 return -ENOMEM;
 381
 382         uio.uio_iov = &iov;
 383         uio.uio_segflg = UIO_SYSSPACE;
 384         curr_offset = filp->f_pos;
 385         if (filp->f_pos != 0x7fffffff)
 386                 uio.uio_offset = filp->f_pos;
 387         else
 388                 uio.uio_offset = 0xffffffff;
 389
 390         while (!eof) {
 391                 uio.uio_resid = iov.iov_len = rlen;
 392                 iov.iov_base = read_buf;
 393                 uio.uio_iovcnt = 1;
 394
 395                 start_offset = uio.uio_offset;
 396
 397                 error = bhv_vop_readdir(vp, &uio, NULL, &eof);
 398                 if ((uio.uio_offset == start_offset) || error) {
 399                         size = 0;
 400                         break;
 401                 }
 402
 403                 size = rlen - uio.uio_resid;
 404                 dbp = (xfs_dirent_t *)read_buf;
 405                 while (size > 0) {
 406                         namelen = strlen(dbp->d_name);
 407
 408                         if (filldir(dirent, dbp->d_name, namelen,
 409                                         (loff_t) curr_offset & 0x7fffffff,
 410                                         (ino_t) dbp->d_ino,
 411                                         DT_UNKNOWN)) {
 412                                 goto done;
 413                         }
 414                         size -= dbp->d_reclen;
 415                         curr_offset = (loff_t)dbp->d_off /* & 0x7fffffff */;
 416                         dbp = (xfs_dirent_t *)((char *)dbp + dbp->d_reclen);
 417                 }
 418         }
 419 done:
 420         if (!error) {
 421                 if (size == 0)
 422                         filp->f_pos = uio.uio_offset & 0x7fffffff;
 423                 else if (dbp)
 424                         filp->f_pos = curr_offset;
 425         }
 426
 427         kfree(read_buf);
 428         return -error;
 429 }
 430
 431 STATIC int
 432 xfs_file_mmap(
 433         struct file     *filp,
 434         struct vm_area_struct *vma)
 435 {
 436         vma->vm_ops = &xfs_file_vm_ops;
 437
 438 #ifdef CONFIG_XFS_DMAPI
 439         if (vn_from_inode(filp->f_dentry->d_inode)->v_vfsp->vfs_flag & VFS_DMI)
 440                 vma->vm_ops = &xfs_dmapi_file_vm_ops;
 441 #endif /* CONFIG_XFS_DMAPI */
 442
 443         file_accessed(filp);
 444         return 0;
 445 }
 446
 447 STATIC long
 448 xfs_file_ioctl(
 449         struct file     *filp,
 450         unsigned int    cmd,
 451         unsigned long   p)
 452 {
 453         int             error;
 454         struct inode    *inode = filp->f_dentry->d_inode;
 455         bhv_vnode_t     *vp = vn_from_inode(inode);
 456
 457         error = bhv_vop_ioctl(vp, inode, filp, 0, cmd, (void __user *)p);
 458         VMODIFY(vp);
 459
 460         /* NOTE:  some of the ioctl's return positive #'s as a
 461          *        byte count indicating success, such as
 462          *        readlink_by_handle.  So we don't "sign flip"
 463          *        like most other routines.  This means true
 464          *        errors need to be returned as a negative value.
 465          */
 466         return error;
 467 }
 468
 469 STATIC long
 470 xfs_file_ioctl_invis(
 471         struct file     *filp,
 472         unsigned int    cmd,
 473         unsigned long   p)
 474 {
 475         int             error;
 476         struct inode    *inode = filp->f_dentry->d_inode;
 477         bhv_vnode_t     *vp = vn_from_inode(inode);
 478
 479         error = bhv_vop_ioctl(vp, inode, filp, IO_INVIS, cmd, (void __user *)p);
 480         VMODIFY(vp);
 481
 482         /* NOTE:  some of the ioctl's return positive #'s as a
 483          *        byte count indicating success, such as
 484          *        readlink_by_handle.  So we don't "sign flip"
 485          *        like most other routines.  This means true
 486          *        errors need to be returned as a negative value.
 487          */
 488         return error;
 489 }
 490
 491 #ifdef CONFIG_XFS_DMAPI
 492 #ifdef HAVE_VMOP_MPROTECT
 493 STATIC int
 494 xfs_vm_mprotect(
 495         struct vm_area_struct *vma,
 496         unsigned int    newflags)
 497 {
 498         bhv_vnode_t     *vp = vn_from_inode(vma->vm_file->f_dentry->d_inode);
 499         int             error = 0;
 500
 501         if (vp->v_vfsp->vfs_flag & VFS_DMI) {
 502                 if ((vma->vm_flags & VM_MAYSHARE) &&
 503                     (newflags & VM_WRITE) && !(vma->vm_flags & VM_WRITE)) {
 504                         xfs_mount_t     *mp = XFS_VFSTOM(vp->v_vfsp);
 505
 506                         error = XFS_SEND_MMAP(mp, vma, VM_WRITE);
 507                     }
 508         }
 509         return error;
 510 }
 511 #endif /* HAVE_VMOP_MPROTECT */
 512 #endif /* CONFIG_XFS_DMAPI */
 513
 514 #ifdef HAVE_FOP_OPEN_EXEC
 515 /* If the user is attempting to execute a file that is offline then
 516  * we have to trigger a DMAPI READ event before the file is marked as busy
 517  * otherwise the invisible I/O will not be able to write to the file to bring
 518  * it back online.
 519  */
 520 STATIC int
 521 xfs_file_open_exec(
 522         struct inode    *inode)
 523 {
 524         bhv_vnode_t     *vp = vn_from_inode(inode);
 525
 526         if (unlikely(vp->v_vfsp->vfs_flag & VFS_DMI)) {
 527                 xfs_mount_t     *mp = XFS_VFSTOM(vp->v_vfsp);
 528                 xfs_inode_t     *ip = xfs_vtoi(vp);
 529
 530                 if (!ip)
 531                         return -EINVAL;
 532                 if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ))
 533                         return -XFS_SEND_DATA(mp, DM_EVENT_READ, vp,
 534                                                0, 0, 0, NULL);
 535         }
 536         return 0;
 537 }
 538 #endif /* HAVE_FOP_OPEN_EXEC */
 539
 540 const struct file_operations xfs_file_operations = {
 541         .llseek         = generic_file_llseek,
 542         .read           = do_sync_read,
 543         .write          = do_sync_write,
 544         .readv          = xfs_file_readv,
 545         .writev         = xfs_file_writev,
 546         .aio_read       = xfs_file_aio_read,
 547         .aio_write      = xfs_file_aio_write,
 548         .sendfile       = xfs_file_sendfile,
 549         .splice_read    = xfs_file_splice_read,
 550         .splice_write   = xfs_file_splice_write,
 551         .unlocked_ioctl = xfs_file_ioctl,
 552 #ifdef CONFIG_COMPAT
 553         .compat_ioctl   = xfs_file_compat_ioctl,
 554 #endif
 555         .mmap           = xfs_file_mmap,
 556         .open           = xfs_file_open,
 557         .flush          = xfs_file_close,
 558         .release        = xfs_file_release,
 559         .fsync          = xfs_file_fsync,
 560 #ifdef HAVE_FOP_OPEN_EXEC
 561         .open_exec      = xfs_file_open_exec,
 562 #endif
 563 };
 564
 565 const struct file_operations xfs_invis_file_operations = {
 566         .llseek         = generic_file_llseek,
 567         .read           = do_sync_read,
 568         .write          = do_sync_write,
 569         .readv          = xfs_file_readv_invis,
 570         .writev         = xfs_file_writev_invis,
 571         .aio_read       = xfs_file_aio_read_invis,
 572         .aio_write      = xfs_file_aio_write_invis,
 573         .sendfile       = xfs_file_sendfile_invis,
 574         .splice_read    = xfs_file_splice_read_invis,
 575         .splice_write   = xfs_file_splice_write_invis,
 576         .unlocked_ioctl = xfs_file_ioctl_invis,
 577 #ifdef CONFIG_COMPAT
 578         .compat_ioctl   = xfs_file_compat_invis_ioctl,
 579 #endif
 580         .mmap           = xfs_file_mmap,
 581         .open           = xfs_file_open,
 582         .flush          = xfs_file_close,
 583         .release        = xfs_file_release,
 584         .fsync          = xfs_file_fsync,
 585 };
 586
 587
 588 const struct file_operations xfs_dir_file_operations = {
 589         .read           = generic_read_dir,
 590         .readdir        = xfs_file_readdir,
 591         .unlocked_ioctl = xfs_file_ioctl,
 592 #ifdef CONFIG_COMPAT
 593         .compat_ioctl   = xfs_file_compat_ioctl,
 594 #endif
 595         .fsync          = xfs_file_fsync,
 596 };
 597
 598 static struct vm_operations_struct xfs_file_vm_ops = {
 599         .nopage         = filemap_nopage,
 600         .populate       = filemap_populate,
 601 };
 602
 603 #ifdef CONFIG_XFS_DMAPI
 604 static struct vm_operations_struct xfs_dmapi_file_vm_ops = {
 605         .nopage         = xfs_vm_nopage,
 606         .populate       = filemap_populate,
 607 #ifdef HAVE_VMOP_MPROTECT
 608         .mprotect       = xfs_vm_mprotect,
 609 #endif
 610 };
 611 #endif /* CONFIG_XFS_DMAPI */