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mirror_zfs/module/spl/spl-vnode.c
Brian Behlendorf 716154c592 Public Release Prep 
Updated AUTHORS, COPYING, DISCLAIMER, and INSTALL files.  Added
standardized headers to all source file to clearly indicate the
copyright, license, and to give credit where credit is due.
2010-05-17 15:18:00 -07:00

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/*****************************************************************************\
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
* Copyright (C) 2007 The Regents of the University of California.
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
* UCRL-CODE-235197
*
* This file is part of the SPL, Solaris Porting Layer.
* For details, see <http://github.com/behlendorf/spl/>.
*
* The SPL is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* The SPL is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
*****************************************************************************
* Solaris Porting Layer (SPL) Vnode Implementation.
\*****************************************************************************/
#include <sys/sysmacros.h>
#include <sys/vnode.h>
#ifdef DEBUG_SUBSYSTEM
#undef DEBUG_SUBSYSTEM
#endif
#define DEBUG_SUBSYSTEM S_VNODE
vnode_t *rootdir = (vnode_t *)0xabcd1234;
EXPORT_SYMBOL(rootdir);
static spl_kmem_cache_t *vn_cache;
static spl_kmem_cache_t *vn_file_cache;
static spinlock_t vn_file_lock = SPIN_LOCK_UNLOCKED;
static LIST_HEAD(vn_file_list);
static vtype_t
vn_get_sol_type(umode_t mode)
{
if (S_ISREG(mode))
return VREG;
if (S_ISDIR(mode))
return VDIR;
if (S_ISCHR(mode))
return VCHR;
if (S_ISBLK(mode))
return VBLK;
if (S_ISFIFO(mode))
return VFIFO;
if (S_ISLNK(mode))
return VLNK;
if (S_ISSOCK(mode))
return VSOCK;
if (S_ISCHR(mode))
return VCHR;
return VNON;
} /* vn_get_sol_type() */
vnode_t *
vn_alloc(int flag)
{
vnode_t *vp;
ENTRY;
vp = kmem_cache_alloc(vn_cache, flag);
if (vp != NULL) {
vp->v_file = NULL;
vp->v_type = 0;
}
RETURN(vp);
} /* vn_alloc() */
EXPORT_SYMBOL(vn_alloc);
void
vn_free(vnode_t *vp)
{
ENTRY;
kmem_cache_free(vn_cache, vp);
EXIT;
} /* vn_free() */
EXPORT_SYMBOL(vn_free);
int
vn_open(const char *path, uio_seg_t seg, int flags, int mode,
vnode_t **vpp, int x1, void *x2)
{
struct file *fp;
struct kstat stat;
int rc, saved_umask = 0;
vnode_t *vp;
ENTRY;
ASSERT(flags & (FWRITE | FREAD));
ASSERT(seg == UIO_SYSSPACE);
ASSERT(vpp);
*vpp = NULL;
if (!(flags & FCREAT) && (flags & FWRITE))
flags |= FEXCL;
/* Note for filp_open() the two low bits must be remapped to mean:
* 01 - read-only -> 00 read-only
* 10 - write-only -> 01 write-only
* 11 - read-write -> 10 read-write
*/
flags--;
if (flags & FCREAT)
saved_umask = xchg(&current->fs->umask, 0);
fp = filp_open(path, flags, mode);
if (flags & FCREAT)
(void)xchg(&current->fs->umask, saved_umask);
if (IS_ERR(fp))
RETURN(-PTR_ERR(fp));
rc = vfs_getattr(fp->f_vfsmnt, fp->f_dentry, &stat);
if (rc) {
filp_close(fp, 0);
RETURN(-rc);
}
vp = vn_alloc(KM_SLEEP);
if (!vp) {
filp_close(fp, 0);
RETURN(ENOMEM);
}
mutex_enter(&vp->v_lock);
vp->v_type = vn_get_sol_type(stat.mode);
vp->v_file = fp;
*vpp = vp;
mutex_exit(&vp->v_lock);
RETURN(0);
} /* vn_open() */
EXPORT_SYMBOL(vn_open);
int
vn_openat(const char *path, uio_seg_t seg, int flags, int mode,
vnode_t **vpp, int x1, void *x2, vnode_t *vp, int fd)
{
char *realpath;
int len, rc;
ENTRY;
ASSERT(vp == rootdir);
len = strlen(path) + 2;
realpath = kmalloc(len, GFP_KERNEL);
if (!realpath)
RETURN(ENOMEM);
(void)snprintf(realpath, len, "/%s", path);
rc = vn_open(realpath, seg, flags, mode, vpp, x1, x2);
kfree(realpath);
RETURN(rc);
} /* vn_openat() */
EXPORT_SYMBOL(vn_openat);
int
vn_rdwr(uio_rw_t uio, vnode_t *vp, void *addr, ssize_t len, offset_t off,
uio_seg_t seg, int ioflag, rlim64_t x2, void *x3, ssize_t *residp)
{
loff_t offset;
mm_segment_t saved_fs;
struct file *fp;
int rc;
ENTRY;
ASSERT(uio == UIO_WRITE || uio == UIO_READ);
ASSERT(vp);
ASSERT(vp->v_file);
ASSERT(seg == UIO_SYSSPACE);
ASSERT((ioflag & ~FAPPEND) == 0);
ASSERT(x2 == RLIM64_INFINITY);
fp = vp->v_file;
offset = off;
if (ioflag & FAPPEND)
offset = fp->f_pos;
/* Writable user data segment must be briefly increased for this
* process so we can use the user space read call paths to write
* in to memory allocated by the kernel. */
saved_fs = get_fs();
set_fs(get_ds());
if (uio & UIO_WRITE)
rc = vfs_write(fp, addr, len, &offset);
else
rc = vfs_read(fp, addr, len, &offset);
set_fs(saved_fs);
if (rc < 0)
RETURN(-rc);
if (residp) {
*residp = len - rc;
} else {
if (rc != len)
RETURN(EIO);
}
RETURN(0);
} /* vn_rdwr() */
EXPORT_SYMBOL(vn_rdwr);
int
vn_close(vnode_t *vp, int flags, int x1, int x2, void *x3, void *x4)
{
int rc;
ENTRY;
ASSERT(vp);
ASSERT(vp->v_file);
rc = filp_close(vp->v_file, 0);
vn_free(vp);
RETURN(-rc);
} /* vn_close() */
EXPORT_SYMBOL(vn_close);
/* vn_seek() does not actually seek it only performs bounds checking on the
* proposed seek. We perform minimal checking and allow vn_rdwr() to catch
* anything more serious. */
int
vn_seek(vnode_t *vp, offset_t ooff, offset_t *noffp, caller_context_t *ct)
{
return ((*noffp < 0 || *noffp > MAXOFFSET_T) ? EINVAL : 0);
}
EXPORT_SYMBOL(vn_seek);
static struct dentry *
vn_lookup_hash(struct nameidata *nd)
{
return lookup_one_len(nd->last.name, nd->nd_dentry, nd->last.len);
} /* lookup_hash() */
static void
vn_path_release(struct nameidata *nd)
{
dput(nd->nd_dentry);
mntput(nd->nd_mnt);
}
/* Modified do_unlinkat() from linux/fs/namei.c, only uses exported symbols */
int
vn_remove(const char *path, uio_seg_t seg, int flags)
{
struct dentry *dentry;
struct nameidata nd;
struct inode *inode = NULL;
int rc = 0;
ENTRY;
ASSERT(seg == UIO_SYSSPACE);
ASSERT(flags == RMFILE);
rc = path_lookup(path, LOOKUP_PARENT, &nd);
if (rc)
GOTO(exit, rc);
rc = -EISDIR;
if (nd.last_type != LAST_NORM)
GOTO(exit1, rc);
#ifdef HAVE_INODE_I_MUTEX
mutex_lock_nested(&nd.nd_dentry->d_inode->i_mutex, I_MUTEX_PARENT);
#else
down(&nd.nd_dentry->d_inode->i_sem);
#endif /* HAVE_INODE_I_MUTEX */
dentry = vn_lookup_hash(&nd);
rc = PTR_ERR(dentry);
if (!IS_ERR(dentry)) {
/* Why not before? Because we want correct rc value */
if (nd.last.name[nd.last.len])
GOTO(slashes, rc);
inode = dentry->d_inode;
if (inode)
atomic_inc(&inode->i_count);
#ifdef HAVE_2ARGS_VFS_UNLINK
rc = vfs_unlink(nd.nd_dentry->d_inode, dentry);
#else
rc = vfs_unlink(nd.nd_dentry->d_inode, dentry, nd.nd_mnt);
#endif /* HAVE_2ARGS_VFS_UNLINK */
exit2:
dput(dentry);
}
#ifdef HAVE_INODE_I_MUTEX
mutex_unlock(&nd.nd_dentry->d_inode->i_mutex);
#else
up(&nd.nd_dentry->d_inode->i_sem);
#endif /* HAVE_INODE_I_MUTEX */
if (inode)
iput(inode); /* truncate the inode here */
exit1:
vn_path_release(&nd);
exit:
RETURN(-rc);
slashes:
rc = !dentry->d_inode ? -ENOENT :
S_ISDIR(dentry->d_inode->i_mode) ? -EISDIR : -ENOTDIR;
GOTO(exit2, rc);
} /* vn_remove() */
EXPORT_SYMBOL(vn_remove);
/* Modified do_rename() from linux/fs/namei.c, only uses exported symbols */
int
vn_rename(const char *oldname, const char *newname, int x1)
{
struct dentry *old_dir, *new_dir;
struct dentry *old_dentry, *new_dentry;
struct dentry *trap;
struct nameidata oldnd, newnd;
int rc = 0;
ENTRY;
rc = path_lookup(oldname, LOOKUP_PARENT, &oldnd);
if (rc)
GOTO(exit, rc);
rc = path_lookup(newname, LOOKUP_PARENT, &newnd);
if (rc)
GOTO(exit1, rc);
rc = -EXDEV;
if (oldnd.nd_mnt != newnd.nd_mnt)
GOTO(exit2, rc);
old_dir = oldnd.nd_dentry;
rc = -EBUSY;
if (oldnd.last_type != LAST_NORM)
GOTO(exit2, rc);
new_dir = newnd.nd_dentry;
if (newnd.last_type != LAST_NORM)
GOTO(exit2, rc);
trap = lock_rename(new_dir, old_dir);
old_dentry = vn_lookup_hash(&oldnd);
rc = PTR_ERR(old_dentry);
if (IS_ERR(old_dentry))
GOTO(exit3, rc);
/* source must exist */
rc = -ENOENT;
if (!old_dentry->d_inode)
GOTO(exit4, rc);
/* unless the source is a directory trailing slashes give -ENOTDIR */
if (!S_ISDIR(old_dentry->d_inode->i_mode)) {
rc = -ENOTDIR;
if (oldnd.last.name[oldnd.last.len])
GOTO(exit4, rc);
if (newnd.last.name[newnd.last.len])
GOTO(exit4, rc);
}
/* source should not be ancestor of target */
rc = -EINVAL;
if (old_dentry == trap)
GOTO(exit4, rc);
new_dentry = vn_lookup_hash(&newnd);
rc = PTR_ERR(new_dentry);
if (IS_ERR(new_dentry))
GOTO(exit4, rc);
/* target should not be an ancestor of source */
rc = -ENOTEMPTY;
if (new_dentry == trap)
GOTO(exit5, rc);
#ifdef HAVE_4ARGS_VFS_RENAME
rc = vfs_rename(old_dir->d_inode, old_dentry,
new_dir->d_inode, new_dentry);
#else
rc = vfs_rename(old_dir->d_inode, old_dentry, oldnd.nd_mnt,
new_dir->d_inode, new_dentry, newnd.nd_mnt);
#endif /* HAVE_4ARGS_VFS_RENAME */
exit5:
dput(new_dentry);
exit4:
dput(old_dentry);
exit3:
unlock_rename(new_dir, old_dir);
exit2:
vn_path_release(&newnd);
exit1:
vn_path_release(&oldnd);
exit:
RETURN(-rc);
}
EXPORT_SYMBOL(vn_rename);
int
vn_getattr(vnode_t *vp, vattr_t *vap, int flags, void *x3, void *x4)
{
struct file *fp;
struct kstat stat;
int rc;
ENTRY;
ASSERT(vp);
ASSERT(vp->v_file);
ASSERT(vap);
fp = vp->v_file;
rc = vfs_getattr(fp->f_vfsmnt, fp->f_dentry, &stat);
if (rc)
RETURN(-rc);
vap->va_type = vn_get_sol_type(stat.mode);
vap->va_mode = stat.mode;
vap->va_uid = stat.uid;
vap->va_gid = stat.gid;
vap->va_fsid = 0;
vap->va_nodeid = stat.ino;
vap->va_nlink = stat.nlink;
vap->va_size = stat.size;
vap->va_blocksize = stat.blksize;
vap->va_atime.tv_sec = stat.atime.tv_sec;
vap->va_atime.tv_usec = stat.atime.tv_nsec / NSEC_PER_USEC;
vap->va_mtime.tv_sec = stat.mtime.tv_sec;
vap->va_mtime.tv_usec = stat.mtime.tv_nsec / NSEC_PER_USEC;
vap->va_ctime.tv_sec = stat.ctime.tv_sec;
vap->va_ctime.tv_usec = stat.ctime.tv_nsec / NSEC_PER_USEC;
vap->va_rdev = stat.rdev;
vap->va_blocks = stat.blocks;
RETURN(0);
}
EXPORT_SYMBOL(vn_getattr);
int vn_fsync(vnode_t *vp, int flags, void *x3, void *x4)
{
int datasync = 0;
ENTRY;
ASSERT(vp);
ASSERT(vp->v_file);
if (flags & FDSYNC)
datasync = 1;
RETURN(-file_fsync(vp->v_file, vp->v_file->f_dentry, datasync));
} /* vn_fsync() */
EXPORT_SYMBOL(vn_fsync);
/* Function must be called while holding the vn_file_lock */
static file_t *
file_find(int fd)
{
file_t *fp;
ASSERT(spin_is_locked(&vn_file_lock));
list_for_each_entry(fp, &vn_file_list, f_list) {
if (fd == fp->f_fd) {
ASSERT(atomic_read(&fp->f_ref) != 0);
return fp;
}
}
return NULL;
} /* file_find() */
file_t *
vn_getf(int fd)
{
struct kstat stat;
struct file *lfp;
file_t *fp;
vnode_t *vp;
int rc = 0;
ENTRY;
/* Already open just take an extra reference */
spin_lock(&vn_file_lock);
fp = file_find(fd);
if (fp) {
atomic_inc(&fp->f_ref);
spin_unlock(&vn_file_lock);
RETURN(fp);
}
spin_unlock(&vn_file_lock);
/* File was not yet opened create the object and setup */
fp = kmem_cache_alloc(vn_file_cache, KM_SLEEP);
if (fp == NULL)
GOTO(out, rc);
mutex_enter(&fp->f_lock);
fp->f_fd = fd;
fp->f_offset = 0;
atomic_inc(&fp->f_ref);
lfp = fget(fd);
if (lfp == NULL)
GOTO(out_mutex, rc);
vp = vn_alloc(KM_SLEEP);
if (vp == NULL)
GOTO(out_fget, rc);
if (vfs_getattr(lfp->f_vfsmnt, lfp->f_dentry, &stat))
GOTO(out_vnode, rc);
mutex_enter(&vp->v_lock);
vp->v_type = vn_get_sol_type(stat.mode);
vp->v_file = lfp;
mutex_exit(&vp->v_lock);
fp->f_vnode = vp;
fp->f_file = lfp;
/* Put it on the tracking list */
spin_lock(&vn_file_lock);
list_add(&fp->f_list, &vn_file_list);
spin_unlock(&vn_file_lock);
mutex_exit(&fp->f_lock);
RETURN(fp);
out_vnode:
vn_free(vp);
out_fget:
fput(lfp);
out_mutex:
mutex_exit(&fp->f_lock);
kmem_cache_free(vn_file_cache, fp);
out:
RETURN(NULL);
} /* getf() */
EXPORT_SYMBOL(getf);
static void releasef_locked(file_t *fp)
{
ASSERT(fp->f_file);
ASSERT(fp->f_vnode);
/* Unlinked from list, no refs, safe to free outside mutex */
fput(fp->f_file);
vn_free(fp->f_vnode);
kmem_cache_free(vn_file_cache, fp);
}
void
vn_releasef(int fd)
{
file_t *fp;
ENTRY;
spin_lock(&vn_file_lock);
fp = file_find(fd);
if (fp) {
atomic_dec(&fp->f_ref);
if (atomic_read(&fp->f_ref) > 0) {
spin_unlock(&vn_file_lock);
EXIT;
return;
}
list_del(&fp->f_list);
releasef_locked(fp);
}
spin_unlock(&vn_file_lock);
EXIT;
return;
} /* releasef() */
EXPORT_SYMBOL(releasef);
#ifndef HAVE_SET_FS_PWD
# ifdef HAVE_2ARGS_SET_FS_PWD
/* Used from 2.6.25 - 2.6.31+ */
void
set_fs_pwd(struct fs_struct *fs, struct path *path)
{
struct path old_pwd;
write_lock(&fs->lock);
old_pwd = fs->pwd;
fs->pwd = *path;
path_get(path);
write_unlock(&fs->lock);
if (old_pwd.dentry)
path_put(&old_pwd);
}
# else
/* Used from 2.6.11 - 2.6.24 */
void
set_fs_pwd(struct fs_struct *fs, struct vfsmount *mnt, struct dentry *dentry)
{
struct dentry *old_pwd;
struct vfsmount *old_pwdmnt;
write_lock(&fs->lock);
old_pwd = fs->pwd;
old_pwdmnt = fs->pwdmnt;
fs->pwdmnt = mntget(mnt);
fs->pwd = dget(dentry);
write_unlock(&fs->lock);
if (old_pwd) {
dput(old_pwd);
mntput(old_pwdmnt);
}
}
# endif /* HAVE_2ARGS_SET_FS_PWD */
#endif /* HAVE_SET_FS_PWD */
int
vn_set_pwd(const char *filename)
{
#ifdef HAVE_2ARGS_SET_FS_PWD
struct path path;
#else
struct nameidata nd;
#endif /* HAVE_2ARGS_SET_FS_PWD */
mm_segment_t saved_fs;
int rc;
ENTRY;
/*
* user_path_dir() and __user_walk() both expect 'filename' to be
* a user space address so we must briefly increase the data segment
* size to ensure strncpy_from_user() does not fail with -EFAULT.
*/
saved_fs = get_fs();
set_fs(get_ds());
#ifdef HAVE_2ARGS_SET_FS_PWD
rc = user_path_dir(filename, &path);
if (rc)
GOTO(out, rc);
rc = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_ACCESS);
if (rc)
GOTO(dput_and_out, rc);
set_fs_pwd(current->fs, &path);
dput_and_out:
path_put(&path);
#else
rc = __user_walk(filename,
LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_CHDIR, &nd);
if (rc)
GOTO(out, rc);
rc = vfs_permission(&nd, MAY_EXEC);
if (rc)
GOTO(dput_and_out, rc);
set_fs_pwd(current->fs, nd.nd_mnt, nd.nd_dentry);
dput_and_out:
vn_path_release(&nd);
#endif /* HAVE_2ARGS_SET_FS_PWD */
out:
set_fs(saved_fs);
RETURN(-rc);
} /* vn_set_pwd() */
EXPORT_SYMBOL(vn_set_pwd);
static int
vn_cache_constructor(void *buf, void *cdrarg, int kmflags)
{
struct vnode *vp = buf;
mutex_init(&vp->v_lock, NULL, MUTEX_DEFAULT, NULL);
return (0);
} /* vn_cache_constructor() */
static void
vn_cache_destructor(void *buf, void *cdrarg)
{
struct vnode *vp = buf;
mutex_destroy(&vp->v_lock);
} /* vn_cache_destructor() */
static int
vn_file_cache_constructor(void *buf, void *cdrarg, int kmflags)
{
file_t *fp = buf;
atomic_set(&fp->f_ref, 0);
mutex_init(&fp->f_lock, NULL, MUTEX_DEFAULT, NULL);
INIT_LIST_HEAD(&fp->f_list);
return (0);
} /* file_cache_constructor() */
static void
vn_file_cache_destructor(void *buf, void *cdrarg)
{
file_t *fp = buf;
mutex_destroy(&fp->f_lock);
} /* vn_file_cache_destructor() */
int
vn_init(void)
{
ENTRY;
vn_cache = kmem_cache_create("spl_vn_cache",
sizeof(struct vnode), 64,
vn_cache_constructor,
vn_cache_destructor,
NULL, NULL, NULL, 0);
vn_file_cache = kmem_cache_create("spl_vn_file_cache",
sizeof(file_t), 64,
vn_file_cache_constructor,
vn_file_cache_destructor,
NULL, NULL, NULL, 0);
RETURN(0);
} /* vn_init() */
void
vn_fini(void)
{
file_t *fp, *next_fp;
int leaked = 0;
ENTRY;
spin_lock(&vn_file_lock);
list_for_each_entry_safe(fp, next_fp, &vn_file_list, f_list) {
list_del(&fp->f_list);
releasef_locked(fp);
leaked++;
}
kmem_cache_destroy(vn_file_cache);
vn_file_cache = NULL;
spin_unlock(&vn_file_lock);
if (leaked > 0)
CWARN("Warning %d files leaked\n", leaked);
kmem_cache_destroy(vn_cache);
EXIT;
return;
} /* vn_fini() */
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