* UCRL-CODE-235197
*
* This file is part of the SPL, Solaris Porting Layer.
- * For details, see <http://github.com/behlendorf/spl/>.
+ * For details, see <http://zfsonlinux.org/>.
*
* 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
* Solaris Porting Layer (SPL) Vnode Implementation.
\*****************************************************************************/
+#include <sys/cred.h>
#include <sys/vnode.h>
+#include <linux/falloc.h>
#include <spl-debug.h>
#ifdef SS_DEBUG_SUBSYS
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 */
-
vtype_t
vn_mode_to_vtype(mode_t mode)
{
if (IS_ERR(fp))
SRETURN(-PTR_ERR(fp));
- rc = vfs_getattr(fp->f_vfsmnt, fp->f_dentry, &stat);
+#ifdef HAVE_2ARGS_VFS_GETATTR
+ rc = vfs_getattr(&fp->f_path, &stat);
+#else
+ rc = vfs_getattr(fp->f_path.mnt, fp->f_dentry, &stat);
+#endif
if (rc) {
filp_close(fp, 0);
SRETURN(-rc);
}
EXPORT_SYMBOL(vn_seek);
-static struct dentry *
-vn_lookup_hash(struct nameidata *nd)
+/*
+ * 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)
{
- return lookup_one_len((const char *)nd->last.name,
- nd->nd_dentry, nd->last.len);
-} /* lookup_hash() */
+ size_t i, end;
-static void
-vn_path_release(struct nameidata *nd)
+ 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)
{
- dput(nd->nd_dentry);
- mntput(nd->nd_mnt);
+ 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(parent.dentry->d_inode);
+
+ 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);
}
-/* Modified do_unlinkat() from linux/fs/namei.c, only uses exported symbols */
+/* Based on do_unlinkat() from linux/fs/namei.c */
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;
+ struct dentry *dentry;
+ struct path parent;
+ struct inode *inode = NULL;
+ int rc = 0;
+ SENTRY;
+
+ ASSERT(seg == UIO_SYSSPACE);
+ ASSERT(flags == RMFILE);
- ASSERT(seg == UIO_SYSSPACE);
- ASSERT(flags == RMFILE);
+ dentry = spl_kern_path_locked(path, &parent);
+ rc = PTR_ERR(dentry);
+ if (!IS_ERR(dentry)) {
+ if (parent.dentry->d_name.name[parent.dentry->d_name.len])
+ SGOTO(slashes, rc = 0);
+
+ inode = dentry->d_inode;
+ if (inode)
+ atomic_inc(&inode->i_count);
+ else
+ SGOTO(slashes, rc = 0);
- 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);
+ rc = vfs_unlink(parent.dentry->d_inode, dentry);
#else
- rc = vfs_unlink(nd.nd_dentry->d_inode, dentry, nd.nd_mnt);
+ rc = vfs_unlink(parent.dentry->d_inode, dentry, NULL);
#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);
+ dput(dentry);
+ } else {
+ return (-rc);
+ }
+
+ spl_inode_unlock(parent.dentry->d_inode);
+ if (inode)
+ iput(inode); /* truncate the inode here */
+
+ path_put(&parent);
+ SRETURN(-rc);
slashes:
- rc = !dentry->d_inode ? -ENOENT :
- S_ISDIR(dentry->d_inode->i_mode) ? -EISDIR : -ENOTDIR;
- SGOTO(exit2, rc);
+ rc = !dentry->d_inode ? -ENOENT :
+ S_ISDIR(dentry->d_inode->i_mode) ? -EISDIR : -ENOTDIR;
+ SGOTO(exit1, rc);
} /* vn_remove() */
EXPORT_SYMBOL(vn_remove);
-/* Modified do_rename() from linux/fs/namei.c, only uses exported symbols */
+/* Based on do_rename() from linux/fs/namei.c */
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;
+ struct dentry *old_dir, *new_dir;
+ struct dentry *old_dentry, *new_dentry;
+ struct dentry *trap;
+ struct path old_parent, new_parent;
+ int rc = 0;
SENTRY;
- rc = spl_kern_path_parent(oldname, &oldnd);
- if (rc)
- SGOTO(exit, rc);
+ old_dentry = spl_kern_path_locked(oldname, &old_parent);
+ if (IS_ERR(old_dentry))
+ SGOTO(exit, rc = PTR_ERR(old_dentry));
- 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);
+ spl_inode_unlock(old_parent.dentry->d_inode);
+
+ new_dentry = spl_kern_path_locked(newname, &new_parent);
+ if (IS_ERR(new_dentry))
+ SGOTO(exit2, rc = PTR_ERR(new_dentry));
+
+ spl_inode_unlock(new_parent.dentry->d_inode);
+
+ rc = -EXDEV;
+ if (old_parent.mnt != new_parent.mnt)
+ SGOTO(exit3, rc);
+
+ old_dir = old_parent.dentry;
+ new_dir = new_parent.dentry;
+ trap = lock_rename(new_dir, old_dir);
+
+ /* source should not be ancestor of target */
+ rc = -EINVAL;
+ if (old_dentry == trap)
+ SGOTO(exit4, rc);
+
+ /* target should not be an ancestor of source */
+ rc = -ENOTEMPTY;
+ if (new_dentry == trap)
+ SGOTO(exit4, 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 (old_dentry->d_name.name[old_dentry->d_name.len])
+ SGOTO(exit4, rc);
+ if (new_dentry->d_name.name[new_dentry->d_name.len])
+ SGOTO(exit4, rc);
+ }
+
+#if defined(HAVE_4ARGS_VFS_RENAME)
+ rc = vfs_rename(old_dir->d_inode, old_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 */
-exit5:
- dput(new_dentry);
+ rc = vfs_rename(old_dir->d_inode, old_dentry,
+ new_dir->d_inode, new_dentry, NULL, 0);
+#endif
exit4:
- dput(old_dentry);
+ unlock_rename(new_dir, old_dir);
exit3:
- unlock_rename(new_dir, old_dir);
+ dput(new_dentry);
+ path_put(&new_parent);
exit2:
- vn_path_release(&newnd);
-exit1:
- vn_path_release(&oldnd);
+ dput(old_dentry);
+ path_put(&old_parent);
exit:
- SRETURN(-rc);
+ SRETURN(-rc);
}
EXPORT_SYMBOL(vn_rename);
fp = vp->v_file;
- rc = vfs_getattr(fp->f_vfsmnt, fp->f_dentry, &stat);
+#ifdef HAVE_2ARGS_VFS_GETATTR
+ rc = vfs_getattr(&fp->f_path, &stat);
+#else
+ rc = vfs_getattr(fp->f_path.mnt, fp->f_dentry, &stat);
+#endif
if (rc)
SRETURN(-rc);
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;
} /* vn_fsync() */
EXPORT_SYMBOL(vn_fsync);
+int vn_space(vnode_t *vp, int cmd, struct flock *bfp, int flag,
+ offset_t offset, void *x6, void *x7)
+{
+ int error = EOPNOTSUPP;
+ SENTRY;
+
+ if (cmd != F_FREESP || bfp->l_whence != 0)
+ SRETURN(EOPNOTSUPP);
+
+ ASSERT(vp);
+ ASSERT(vp->v_file);
+ ASSERT(bfp->l_start >= 0 && bfp->l_len > 0);
+
+#ifdef FALLOC_FL_PUNCH_HOLE
+ /*
+ * When supported by the underlying file system preferentially
+ * use the fallocate() callback to preallocate the space.
+ */
+ error = -spl_filp_fallocate(vp->v_file,
+ FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
+ bfp->l_start, bfp->l_len);
+ if (error == 0)
+ SRETURN(0);
+#endif
+
+#ifdef HAVE_INODE_TRUNCATE_RANGE
+ if (vp->v_file->f_dentry && vp->v_file->f_dentry->d_inode &&
+ vp->v_file->f_dentry->d_inode->i_op &&
+ vp->v_file->f_dentry->d_inode->i_op->truncate_range) {
+ off_t end = bfp->l_start + bfp->l_len;
+ /*
+ * Judging from the code in shmem_truncate_range(),
+ * it seems the kernel expects the end offset to be
+ * inclusive and aligned to the end of a page.
+ */
+ if (end % PAGE_SIZE != 0) {
+ end &= ~(off_t)(PAGE_SIZE - 1);
+ if (end <= bfp->l_start)
+ SRETURN(0);
+ }
+ --end;
+
+ vp->v_file->f_dentry->d_inode->i_op->truncate_range(
+ vp->v_file->f_dentry->d_inode,
+ bfp->l_start, end
+ );
+ SRETURN(0);
+ }
+#endif
+
+ SRETURN(error);
+}
+EXPORT_SYMBOL(vn_space);
+
/* Function must be called while holding the vn_file_lock */
static file_t *
file_find(int fd)
if (vp == NULL)
SGOTO(out_fget, rc);
- if (vfs_getattr(lfp->f_vfsmnt, lfp->f_dentry, &stat))
+#ifdef HAVE_2ARGS_VFS_GETATTR
+ rc = vfs_getattr(&lfp->f_path, &stat);
+#else
+ rc = vfs_getattr(lfp->f_path.mnt, lfp->f_dentry, &stat);
+#endif
+ if (rc)
SGOTO(out_vnode, rc);
mutex_enter(&vp->v_lock);
} /* 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)
+static void
+#ifdef HAVE_SET_FS_PWD_WITH_CONST
+vn_set_fs_pwd(struct fs_struct *fs, const struct path *path)
+#else
+vn_set_fs_pwd(struct fs_struct *fs, struct path *path)
+#endif /* HAVE_SET_FS_PWD_WITH_CONST */
{
struct path old_pwd;
-# ifdef HAVE_FS_STRUCT_SPINLOCK
+#ifdef HAVE_FS_STRUCT_SPINLOCK
spin_lock(&fs->lock);
old_pwd = fs->pwd;
fs->pwd = *path;
path_get(path);
spin_unlock(&fs->lock);
-# else
+#else
write_lock(&fs->lock);
old_pwd = fs->pwd;
fs->pwd = *path;
path_get(path);
write_unlock(&fs->lock);
-# endif /* HAVE_FS_STRUCT_SPINLOCK */
+#endif /* HAVE_FS_STRUCT_SPINLOCK */
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)
struct path path;
-#else
- struct nameidata nd;
-#endif /* HAVE_2ARGS_SET_FS_PWD */
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)
SGOTO(out, rc);
if (rc)
SGOTO(dput_and_out, rc);
- set_fs_pwd(current->fs, &path);
+ vn_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)
- SGOTO(out, rc);
-
- rc = vfs_permission(&nd, MAY_EXEC);
- if (rc)
- SGOTO(dput_and_out, rc);
-
- set_fs_pwd(current->fs, &nd.path);
-
-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 */
-
- return (0);
-}
-
int
spl_vn_init(void)
{
leaked++;
}
- kmem_cache_destroy(vn_file_cache);
- vn_file_cache = NULL;
spin_unlock(&vn_file_lock);
if (leaked > 0)
SWARN("Warning %d files leaked\n", leaked);
+ kmem_cache_destroy(vn_file_cache);
kmem_cache_destroy(vn_cache);
SEXIT;
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