1 /*****************************************************************************\
2 * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
3 * Copyright (C) 2007 The Regents of the University of California.
4 * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
5 * Written by Brian Behlendorf <behlendorf1@llnl.gov>.
8 * This file is part of the SPL, Solaris Porting Layer.
9 * For details, see <http://github.com/behlendorf/spl/>.
11 * The SPL is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
16 * The SPL is distributed in the hope that it will be useful, but WITHOUT
17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 * You should have received a copy of the GNU General Public License along
22 * with the SPL. If not, see <http://www.gnu.org/licenses/>.
23 *****************************************************************************
24 * Solaris Porting Layer (SPL) Vnode Implementation.
25 \*****************************************************************************/
27 #include <sys/vnode.h>
28 #include <spl-debug.h>
30 #ifdef SS_DEBUG_SUBSYS
31 #undef SS_DEBUG_SUBSYS
34 #define SS_DEBUG_SUBSYS SS_VNODE
36 vnode_t *rootdir = (vnode_t *)0xabcd1234;
37 EXPORT_SYMBOL(rootdir);
39 static spl_kmem_cache_t *vn_cache;
40 static spl_kmem_cache_t *vn_file_cache;
42 static DEFINE_SPINLOCK(vn_file_lock);
43 static LIST_HEAD(vn_file_list);
46 vn_mode_to_vtype(mode_t mode)
73 } /* vn_mode_to_vtype() */
74 EXPORT_SYMBOL(vn_mode_to_vtype);
77 vn_vtype_to_mode(vtype_t vtype)
101 } /* vn_vtype_to_mode() */
102 EXPORT_SYMBOL(vn_vtype_to_mode);
110 vp = kmem_cache_alloc(vn_cache, flag);
118 EXPORT_SYMBOL(vn_alloc);
124 kmem_cache_free(vn_cache, vp);
127 EXPORT_SYMBOL(vn_free);
130 vn_open(const char *path, uio_seg_t seg, int flags, int mode,
131 vnode_t **vpp, int x1, void *x2)
135 int rc, saved_umask = 0;
140 ASSERT(flags & (FWRITE | FREAD));
141 ASSERT(seg == UIO_SYSSPACE);
145 if (!(flags & FCREAT) && (flags & FWRITE))
148 /* Note for filp_open() the two low bits must be remapped to mean:
149 * 01 - read-only -> 00 read-only
150 * 10 - write-only -> 01 write-only
151 * 11 - read-write -> 10 read-write
156 saved_umask = xchg(¤t->fs->umask, 0);
158 fp = filp_open(path, flags, mode);
161 (void)xchg(¤t->fs->umask, saved_umask);
164 SRETURN(-PTR_ERR(fp));
166 rc = vfs_getattr(fp->f_vfsmnt, fp->f_dentry, &stat);
172 vp = vn_alloc(KM_SLEEP);
178 saved_gfp = mapping_gfp_mask(fp->f_mapping);
179 mapping_set_gfp_mask(fp->f_mapping, saved_gfp & ~(__GFP_IO|__GFP_FS));
181 mutex_enter(&vp->v_lock);
182 vp->v_type = vn_mode_to_vtype(stat.mode);
184 vp->v_gfp_mask = saved_gfp;
186 mutex_exit(&vp->v_lock);
190 EXPORT_SYMBOL(vn_open);
193 vn_openat(const char *path, uio_seg_t seg, int flags, int mode,
194 vnode_t **vpp, int x1, void *x2, vnode_t *vp, int fd)
200 ASSERT(vp == rootdir);
202 len = strlen(path) + 2;
203 realpath = kmalloc(len, GFP_KERNEL);
207 (void)snprintf(realpath, len, "/%s", path);
208 rc = vn_open(realpath, seg, flags, mode, vpp, x1, x2);
213 EXPORT_SYMBOL(vn_openat);
216 vn_rdwr(uio_rw_t uio, vnode_t *vp, void *addr, ssize_t len, offset_t off,
217 uio_seg_t seg, int ioflag, rlim64_t x2, void *x3, ssize_t *residp)
220 mm_segment_t saved_fs;
225 ASSERT(uio == UIO_WRITE || uio == UIO_READ);
228 ASSERT(seg == UIO_SYSSPACE);
229 ASSERT((ioflag & ~FAPPEND) == 0);
230 ASSERT(x2 == RLIM64_INFINITY);
235 if (ioflag & FAPPEND)
238 /* Writable user data segment must be briefly increased for this
239 * process so we can use the user space read call paths to write
240 * in to memory allocated by the kernel. */
245 rc = vfs_write(fp, addr, len, &offset);
247 rc = vfs_read(fp, addr, len, &offset);
263 EXPORT_SYMBOL(vn_rdwr);
266 vn_close(vnode_t *vp, int flags, int x1, int x2, void *x3, void *x4)
274 mapping_set_gfp_mask(vp->v_file->f_mapping, vp->v_gfp_mask);
275 rc = filp_close(vp->v_file, 0);
280 EXPORT_SYMBOL(vn_close);
282 /* vn_seek() does not actually seek it only performs bounds checking on the
283 * proposed seek. We perform minimal checking and allow vn_rdwr() to catch
284 * anything more serious. */
286 vn_seek(vnode_t *vp, offset_t ooff, offset_t *noffp, void *ct)
288 return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0);
290 EXPORT_SYMBOL(vn_seek);
292 static struct dentry *
293 vn_lookup_hash(struct nameidata *nd)
295 return lookup_one_len((const char *)nd->last.name,
296 nd->nd_dentry, nd->last.len);
297 } /* lookup_hash() */
300 vn_path_release(struct nameidata *nd)
306 /* Modified do_unlinkat() from linux/fs/namei.c, only uses exported symbols */
308 vn_remove(const char *path, uio_seg_t seg, int flags)
310 struct dentry *dentry;
312 struct inode *inode = NULL;
316 ASSERT(seg == UIO_SYSSPACE);
317 ASSERT(flags == RMFILE);
319 rc = spl_kern_path_parent(path, &nd);
324 if (nd.last_type != LAST_NORM)
327 spl_inode_lock_nested(nd.nd_dentry->d_inode, I_MUTEX_PARENT);
328 dentry = vn_lookup_hash(&nd);
329 rc = PTR_ERR(dentry);
330 if (!IS_ERR(dentry)) {
331 /* Why not before? Because we want correct rc value */
332 if (nd.last.name[nd.last.len])
335 inode = dentry->d_inode;
337 atomic_inc(&inode->i_count);
338 #ifdef HAVE_2ARGS_VFS_UNLINK
339 rc = vfs_unlink(nd.nd_dentry->d_inode, dentry);
341 rc = vfs_unlink(nd.nd_dentry->d_inode, dentry, nd.nd_mnt);
342 #endif /* HAVE_2ARGS_VFS_UNLINK */
347 spl_inode_unlock(nd.nd_dentry->d_inode);
349 iput(inode); /* truncate the inode here */
351 vn_path_release(&nd);
356 rc = !dentry->d_inode ? -ENOENT :
357 S_ISDIR(dentry->d_inode->i_mode) ? -EISDIR : -ENOTDIR;
360 EXPORT_SYMBOL(vn_remove);
362 /* Modified do_rename() from linux/fs/namei.c, only uses exported symbols */
364 vn_rename(const char *oldname, const char *newname, int x1)
366 struct dentry *old_dir, *new_dir;
367 struct dentry *old_dentry, *new_dentry;
369 struct nameidata oldnd, newnd;
373 rc = spl_kern_path_parent(oldname, &oldnd);
377 rc = spl_kern_path_parent(newname, &newnd);
382 if (oldnd.nd_mnt != newnd.nd_mnt)
385 old_dir = oldnd.nd_dentry;
387 if (oldnd.last_type != LAST_NORM)
390 new_dir = newnd.nd_dentry;
391 if (newnd.last_type != LAST_NORM)
394 trap = lock_rename(new_dir, old_dir);
396 old_dentry = vn_lookup_hash(&oldnd);
398 rc = PTR_ERR(old_dentry);
399 if (IS_ERR(old_dentry))
402 /* source must exist */
404 if (!old_dentry->d_inode)
407 /* unless the source is a directory trailing slashes give -ENOTDIR */
408 if (!S_ISDIR(old_dentry->d_inode->i_mode)) {
410 if (oldnd.last.name[oldnd.last.len])
412 if (newnd.last.name[newnd.last.len])
416 /* source should not be ancestor of target */
418 if (old_dentry == trap)
421 new_dentry = vn_lookup_hash(&newnd);
422 rc = PTR_ERR(new_dentry);
423 if (IS_ERR(new_dentry))
426 /* target should not be an ancestor of source */
428 if (new_dentry == trap)
431 #ifdef HAVE_4ARGS_VFS_RENAME
432 rc = vfs_rename(old_dir->d_inode, old_dentry,
433 new_dir->d_inode, new_dentry);
435 rc = vfs_rename(old_dir->d_inode, old_dentry, oldnd.nd_mnt,
436 new_dir->d_inode, new_dentry, newnd.nd_mnt);
437 #endif /* HAVE_4ARGS_VFS_RENAME */
443 unlock_rename(new_dir, old_dir);
445 vn_path_release(&newnd);
447 vn_path_release(&oldnd);
451 EXPORT_SYMBOL(vn_rename);
454 vn_getattr(vnode_t *vp, vattr_t *vap, int flags, void *x3, void *x4)
467 rc = vfs_getattr(fp->f_vfsmnt, fp->f_dentry, &stat);
471 vap->va_type = vn_mode_to_vtype(stat.mode);
472 vap->va_mode = stat.mode;
473 vap->va_uid = stat.uid;
474 vap->va_gid = stat.gid;
476 vap->va_nodeid = stat.ino;
477 vap->va_nlink = stat.nlink;
478 vap->va_size = stat.size;
479 vap->va_blksize = stat.blksize;
480 vap->va_atime = stat.atime;
481 vap->va_mtime = stat.mtime;
482 vap->va_ctime = stat.ctime;
483 vap->va_rdev = stat.rdev;
484 vap->va_nblocks = stat.blocks;
488 EXPORT_SYMBOL(vn_getattr);
490 int vn_fsync(vnode_t *vp, int flags, void *x3, void *x4)
501 SRETURN(-spl_filp_fsync(vp->v_file, datasync));
503 EXPORT_SYMBOL(vn_fsync);
505 /* Function must be called while holding the vn_file_lock */
511 ASSERT(spin_is_locked(&vn_file_lock));
513 list_for_each_entry(fp, &vn_file_list, f_list) {
514 if (fd == fp->f_fd) {
515 ASSERT(atomic_read(&fp->f_ref) != 0);
533 /* Already open just take an extra reference */
534 spin_lock(&vn_file_lock);
538 atomic_inc(&fp->f_ref);
539 spin_unlock(&vn_file_lock);
543 spin_unlock(&vn_file_lock);
545 /* File was not yet opened create the object and setup */
546 fp = kmem_cache_alloc(vn_file_cache, KM_SLEEP);
550 mutex_enter(&fp->f_lock);
554 atomic_inc(&fp->f_ref);
558 SGOTO(out_mutex, rc);
560 vp = vn_alloc(KM_SLEEP);
564 if (vfs_getattr(lfp->f_vfsmnt, lfp->f_dentry, &stat))
565 SGOTO(out_vnode, rc);
567 mutex_enter(&vp->v_lock);
568 vp->v_type = vn_mode_to_vtype(stat.mode);
570 mutex_exit(&vp->v_lock);
575 /* Put it on the tracking list */
576 spin_lock(&vn_file_lock);
577 list_add(&fp->f_list, &vn_file_list);
578 spin_unlock(&vn_file_lock);
580 mutex_exit(&fp->f_lock);
588 mutex_exit(&fp->f_lock);
589 kmem_cache_free(vn_file_cache, fp);
595 static void releasef_locked(file_t *fp)
600 /* Unlinked from list, no refs, safe to free outside mutex */
602 vn_free(fp->f_vnode);
604 kmem_cache_free(vn_file_cache, fp);
613 spin_lock(&vn_file_lock);
616 atomic_dec(&fp->f_ref);
617 if (atomic_read(&fp->f_ref) > 0) {
618 spin_unlock(&vn_file_lock);
623 list_del(&fp->f_list);
626 spin_unlock(&vn_file_lock);
631 EXPORT_SYMBOL(releasef);
633 #ifndef HAVE_SET_FS_PWD
634 # ifdef HAVE_2ARGS_SET_FS_PWD
635 /* Used from 2.6.25 - 2.6.31+ */
637 set_fs_pwd(struct fs_struct *fs, struct path *path)
641 # ifdef HAVE_FS_STRUCT_SPINLOCK
642 spin_lock(&fs->lock);
646 spin_unlock(&fs->lock);
648 write_lock(&fs->lock);
652 write_unlock(&fs->lock);
653 # endif /* HAVE_FS_STRUCT_SPINLOCK */
659 /* Used from 2.6.11 - 2.6.24 */
661 set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt, struct dentry *dentry)
663 struct dentry *old_pwd;
664 struct vfsmount *old_pwdmnt;
666 write_lock(&fs->lock);
668 old_pwdmnt = fs->pwdmnt;
669 fs->pwdmnt = mntget(mnt);
670 fs->pwd = dget(dentry);
671 write_unlock(&fs->lock);
678 # endif /* HAVE_2ARGS_SET_FS_PWD */
679 #endif /* HAVE_SET_FS_PWD */
682 vn_set_pwd(const char *filename)
684 #if defined(HAVE_2ARGS_SET_FS_PWD) && defined(HAVE_USER_PATH_DIR)
688 #endif /* HAVE_2ARGS_SET_FS_PWD */
689 mm_segment_t saved_fs;
694 * user_path_dir() and __user_walk() both expect 'filename' to be
695 * a user space address so we must briefly increase the data segment
696 * size to ensure strncpy_from_user() does not fail with -EFAULT.
701 #ifdef HAVE_2ARGS_SET_FS_PWD
702 # ifdef HAVE_USER_PATH_DIR
703 rc = user_path_dir(filename, &path);
707 rc = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS);
709 SGOTO(dput_and_out, rc);
711 set_fs_pwd(current->fs, &path);
716 rc = __user_walk(filename,
717 LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_CHDIR, &nd);
721 rc = vfs_permission(&nd, MAY_EXEC);
723 SGOTO(dput_and_out, rc);
725 set_fs_pwd(current->fs, &nd.path);
729 # endif /* HAVE_USER_PATH_DIR */
731 rc = __user_walk(filename,
732 LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_CHDIR, &nd);
736 rc = vfs_permission(&nd, MAY_EXEC);
738 SGOTO(dput_and_out, rc);
740 set_fs_pwd(current->fs, nd.nd_mnt, nd.nd_dentry);
743 vn_path_release(&nd);
744 #endif /* HAVE_2ARGS_SET_FS_PWD */
750 EXPORT_SYMBOL(vn_set_pwd);
753 vn_cache_constructor(void *buf, void *cdrarg, int kmflags)
755 struct vnode *vp = buf;
757 mutex_init(&vp->v_lock, NULL, MUTEX_DEFAULT, NULL);
760 } /* vn_cache_constructor() */
763 vn_cache_destructor(void *buf, void *cdrarg)
765 struct vnode *vp = buf;
767 mutex_destroy(&vp->v_lock);
768 } /* vn_cache_destructor() */
771 vn_file_cache_constructor(void *buf, void *cdrarg, int kmflags)
775 atomic_set(&fp->f_ref, 0);
776 mutex_init(&fp->f_lock, NULL, MUTEX_DEFAULT, NULL);
777 INIT_LIST_HEAD(&fp->f_list);
780 } /* file_cache_constructor() */
783 vn_file_cache_destructor(void *buf, void *cdrarg)
787 mutex_destroy(&fp->f_lock);
788 } /* vn_file_cache_destructor() */
794 vn_cache = kmem_cache_create("spl_vn_cache",
795 sizeof(struct vnode), 64,
796 vn_cache_constructor,
798 NULL, NULL, NULL, KMC_KMEM);
800 vn_file_cache = kmem_cache_create("spl_vn_file_cache",
802 vn_file_cache_constructor,
803 vn_file_cache_destructor,
804 NULL, NULL, NULL, KMC_KMEM);
811 file_t *fp, *next_fp;
815 spin_lock(&vn_file_lock);
817 list_for_each_entry_safe(fp, next_fp, &vn_file_list, f_list) {
818 list_del(&fp->f_list);
823 kmem_cache_destroy(vn_file_cache);
824 vn_file_cache = NULL;
825 spin_unlock(&vn_file_lock);
828 SWARN("Warning %d files leaked\n", leaked);
830 kmem_cache_destroy(vn_cache);