* Solaris Porting Layer (SPL) Vnode Implementation.
\*****************************************************************************/
+#include <sys/cred.h>
#include <sys/vnode.h>
#include <linux/falloc.h>
#include <spl-debug.h>
static DEFINE_SPINLOCK(vn_file_lock);
static LIST_HEAD(vn_file_list);
-#ifdef HAVE_KERN_PATH_PARENT_HEADER
-#ifndef HAVE_KERN_PATH_PARENT_SYMBOL
-kern_path_parent_t kern_path_parent_fn = SYMBOL_POISON;
-EXPORT_SYMBOL(kern_path_parent_fn);
-#endif /* HAVE_KERN_PATH_PARENT_SYMBOL */
-#endif /* HAVE_KERN_PATH_PARENT_HEADER */
-
-#ifdef HAVE_KERN_PATH_LOCKED
-kern_path_locked_t kern_path_locked_fn = SYMBOL_POISON;
-#endif /* HAVE_KERN_PATH_LOCKED */
-
vtype_t
vn_mode_to_vtype(mode_t mode)
{
}
EXPORT_SYMBOL(vn_seek);
-#ifdef HAVE_KERN_PATH_LOCKED
+/*
+ * kern_path() was introduced in Linux 2.6.28. We duplicate it as a
+ * compatibility shim for earlier kernels.
+ */
+#ifndef HAVE_KERN_PATH
+int
+kern_path(const char *name, unsigned int flags, struct path *path)
+{
+ struct nameidata nd;
+ int rc = path_lookup(name, flags, &nd);
+ if (!rc)
+ *path = nd.path;
+ return rc;
+}
+#endif /* HAVE_KERN_PATH */
+
+/*
+ * spl_basename() takes a NULL-terminated string s as input containing a path.
+ * It returns a char pointer to a string and a length that describe the
+ * basename of the path. If the basename is not "." or "/", it will be an index
+ * into the string. While the string should be NULL terminated, the section
+ * referring to the basename is not. spl_basename is dual-licensed GPLv2+ and
+ * CC0. Anyone wishing to reuse it in another codebase may pick either license.
+ */
+static void
+spl_basename(const char *s, const char **str, int *len)
+{
+ size_t i, end;
+
+ ASSERT(str);
+ ASSERT(len);
+
+ if (!s || !*s) {
+ *str = ".";
+ *len = 1;
+ return;
+ }
+
+ i = strlen(s) - 1;
+
+ while (i && s[i--] == '/');
+
+ if (i == 0) {
+ *str = "/";
+ *len = 1;
+ return;
+ }
+
+ end = i;
+
+ for (end = i; i; i--) {
+ if (s[i] == '/') {
+ *str = &s[i+1];
+ *len = end - i + 1;
+ return;
+ }
+ }
+
+ *str = s;
+ *len = end + 1;
+}
+
+static struct dentry *
+spl_kern_path_locked(const char *name, struct path *path)
+{
+ struct path parent;
+ struct dentry *dentry;
+ const char *basename;
+ int len;
+ int rc;
+
+ ASSERT(name);
+ ASSERT(path);
+
+ spl_basename(name, &basename, &len);
+
+ /* We do not accept "." or ".." */
+ if (len <= 2 && basename[0] == '.')
+ if (len == 1 || basename[1] == '.')
+ return (ERR_PTR(-EACCES));
+
+ rc = kern_path(name, LOOKUP_PARENT, &parent);
+ if (rc)
+ return (ERR_PTR(rc));
+
+ spl_inode_lock_nested(parent.dentry->d_inode, I_MUTEX_PARENT);
+
+ dentry = lookup_one_len(basename, parent.dentry, len);
+ if (IS_ERR(dentry)) {
+ spl_inode_unlock(parent.dentry->d_inode);
+ path_put(&parent);
+ } else {
+ *path = parent;
+ }
+
+ return (dentry);
+}
+
/* Based on do_unlinkat() from linux/fs/namei.c */
int
vn_remove(const char *path, uio_seg_t seg, int flags)
SGOTO(slashes, rc = 0);
inode = dentry->d_inode;
- if (!inode)
- SGOTO(slashes, rc = 0);
-
if (inode)
- ihold(inode);
+ atomic_inc(&inode->i_count);
+ else
+ SGOTO(slashes, rc = 0);
+#ifdef HAVE_2ARGS_VFS_UNLINK
rc = vfs_unlink(parent.dentry->d_inode, dentry);
+#else
+ rc = vfs_unlink(parent.dentry->d_inode, dentry, NULL);
+#endif /* HAVE_2ARGS_VFS_UNLINK */
exit1:
dput(dentry);
} else {
SGOTO(exit4, rc);
}
-#ifdef HAVE_4ARGS_VFS_RENAME
+#if defined(HAVE_4ARGS_VFS_RENAME)
rc = vfs_rename(old_dir->d_inode, old_dentry,
- new_dir->d_inode, new_dentry);
+ new_dir->d_inode, new_dentry);
+#elif defined(HAVE_5ARGS_VFS_RENAME)
+ rc = vfs_rename(old_dir->d_inode, old_dentry,
+ new_dir->d_inode, new_dentry, NULL);
#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 */
+ rc = vfs_rename(old_dir->d_inode, old_dentry,
+ new_dir->d_inode, new_dentry, NULL, 0);
+#endif
exit4:
unlock_rename(new_dir, old_dir);
exit3:
}
EXPORT_SYMBOL(vn_rename);
-#else
-static struct dentry *
-vn_lookup_hash(struct nameidata *nd)
-{
- return lookup_one_len((const char *)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;
- SENTRY;
-
- ASSERT(seg == UIO_SYSSPACE);
- ASSERT(flags == RMFILE);
-
- rc = spl_kern_path_parent(path, &nd);
- if (rc)
- SGOTO(exit, rc);
-
- rc = -EISDIR;
- if (nd.last_type != LAST_NORM)
- SGOTO(exit1, rc);
-
- spl_inode_lock_nested(nd.nd_dentry->d_inode, I_MUTEX_PARENT);
- 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])
- SGOTO(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);
- }
-
- spl_inode_unlock(nd.nd_dentry->d_inode);
- if (inode)
- iput(inode); /* truncate the inode here */
-exit1:
- vn_path_release(&nd);
-exit:
- SRETURN(-rc);
-
-slashes:
- rc = !dentry->d_inode ? -ENOENT :
- S_ISDIR(dentry->d_inode->i_mode) ? -EISDIR : -ENOTDIR;
- SGOTO(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;
- SENTRY;
-
- rc = spl_kern_path_parent(oldname, &oldnd);
- if (rc)
- SGOTO(exit, rc);
-
- rc = spl_kern_path_parent(newname, &newnd);
- if (rc)
- SGOTO(exit1, rc);
-
- rc = -EXDEV;
- if (oldnd.nd_mnt != newnd.nd_mnt)
- SGOTO(exit2, rc);
-
- old_dir = oldnd.nd_dentry;
- rc = -EBUSY;
- if (oldnd.last_type != LAST_NORM)
- SGOTO(exit2, rc);
-
- new_dir = newnd.nd_dentry;
- if (newnd.last_type != LAST_NORM)
- SGOTO(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))
- SGOTO(exit3, rc);
-
- /* source must exist */
- rc = -ENOENT;
- if (!old_dentry->d_inode)
- SGOTO(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])
- SGOTO(exit4, rc);
- if (newnd.last.name[newnd.last.len])
- SGOTO(exit4, rc);
- }
-
- /* source should not be ancestor of target */
- rc = -EINVAL;
- if (old_dentry == trap)
- SGOTO(exit4, rc);
-
- new_dentry = vn_lookup_hash(&newnd);
- rc = PTR_ERR(new_dentry);
- if (IS_ERR(new_dentry))
- SGOTO(exit4, rc);
-
- /* target should not be an ancestor of source */
- rc = -ENOTEMPTY;
- if (new_dentry == trap)
- SGOTO(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:
- SRETURN(-rc);
-}
-EXPORT_SYMBOL(vn_rename);
-#endif /* HAVE_KERN_PATH_LOCKED */
-
int
vn_getattr(vnode_t *vp, vattr_t *vap, int flags, void *x3, void *x4)
{
vap->va_type = vn_mode_to_vtype(stat.mode);
vap->va_mode = stat.mode;
- vap->va_uid = stat.uid;
- vap->va_gid = stat.gid;
+ vap->va_uid = KUID_TO_SUID(stat.uid);
+ vap->va_gid = KGID_TO_SGID(stat.gid);
vap->va_fsid = 0;
vap->va_nodeid = stat.ino;
vap->va_nlink = stat.nlink;
EXPORT_SYMBOL(releasef);
#ifndef HAVE_SET_FS_PWD
-# ifdef HAVE_2ARGS_SET_FS_PWD
-/* Used from 2.6.25 - 2.6.31+ */
void
# ifdef HAVE_SET_FS_PWD_WITH_CONST
set_fs_pwd(struct fs_struct *fs, const struct path *path)
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)
{
-#if defined(HAVE_2ARGS_SET_FS_PWD) && defined(HAVE_USER_PATH_DIR)
+#ifdef HAVE_USER_PATH_DIR
struct path path;
#else
struct nameidata nd;
-#endif /* HAVE_2ARGS_SET_FS_PWD */
+#endif /* HAVE_USER_PATH_DIR */
mm_segment_t saved_fs;
int rc;
SENTRY;
saved_fs = get_fs();
set_fs(get_ds());
-#ifdef HAVE_2ARGS_SET_FS_PWD
# ifdef HAVE_USER_PATH_DIR
rc = user_path_dir(filename, &path);
if (rc)
dput_and_out:
path_put(&nd.path);
# endif /* HAVE_USER_PATH_DIR */
-#else
- rc = __user_walk(filename,
- LOOKUP_FOLLOW|LOOKUP_DIRECTORY|LOOKUP_CHDIR, &nd);
- if (rc)
- SGOTO(out, rc);
-
- rc = vfs_permission(&nd, MAY_EXEC);
- if (rc)
- SGOTO(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);
mutex_destroy(&fp->f_lock);
} /* vn_file_cache_destructor() */
-int spl_vn_init_kallsyms_lookup(void)
-{
-#ifdef HAVE_KERN_PATH_PARENT_HEADER
-#ifndef HAVE_KERN_PATH_PARENT_SYMBOL
- kern_path_parent_fn = (kern_path_parent_t)
- spl_kallsyms_lookup_name("kern_path_parent");
- if (!kern_path_parent_fn) {
- printk(KERN_ERR "Error: Unknown symbol kern_path_parent\n");
- return -EFAULT;
- }
-#endif /* HAVE_KERN_PATH_PARENT_SYMBOL */
-#endif /* HAVE_KERN_PATH_PARENT_HEADER */
-
-#ifdef HAVE_KERN_PATH_LOCKED
- kern_path_locked_fn = (kern_path_locked_t)
- spl_kallsyms_lookup_name("kern_path_locked");
- if (!kern_path_locked_fn) {
- printk(KERN_ERR "Error: Unknown symbol kern_path_locked\n");
- return -EFAULT;
- }
-#endif
-
- return (0);
-}
-
int
spl_vn_init(void)
{
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