SPL_AC_TYPE_UINTPTR_T
SPL_AC_2ARGS_REGISTER_SYSCTL
SPL_AC_SHRINKER_CALLBACK
- SPL_AC_PATH_IN_NAMEIDATA
SPL_AC_TASK_CURR
SPL_AC_CTL_UNNUMBERED
SPL_AC_CTL_NAME
SPL_AC_KERNEL_FALLOCATE
SPL_AC_SHRINK_DCACHE_MEMORY
SPL_AC_SHRINK_ICACHE_MEMORY
- SPL_AC_KERN_PATH_PARENT_HEADER
- SPL_AC_KERN_PATH_PARENT_SYMBOL
- SPL_AC_KERN_PATH_LOCKED
+ SPL_AC_KERN_PATH
SPL_AC_CONFIG_KALLSYMS
SPL_AC_CONFIG_ZLIB_INFLATE
SPL_AC_CONFIG_ZLIB_DEFLATE
EXTRA_KCFLAGS="$tmp_flags"
])
-dnl #
-dnl # 2.6.25 API change,
-dnl # struct path entry added to struct nameidata
-dnl #
-AC_DEFUN([SPL_AC_PATH_IN_NAMEIDATA],
- [AC_MSG_CHECKING([whether struct path used in struct nameidata])
- SPL_LINUX_TRY_COMPILE([
- #include <linux/namei.h>
- ],[
- struct nameidata nd __attribute__ ((unused));
-
- nd.path.mnt = NULL;
- nd.path.dentry = NULL;
- ],[
- AC_MSG_RESULT(yes)
- AC_DEFINE(HAVE_PATH_IN_NAMEIDATA, 1,
- [struct path used in struct nameidata])
- ],[
- AC_MSG_RESULT(no)
- ])
-])
-
dnl #
dnl # Custom SPL patch may export this system it is not required
dnl #
])
dnl #
-dnl # 2.6.39 API compat,
-dnl # The path_lookup() function has been renamed to kern_path_parent()
-dnl # and the flags argument has been removed. The only behavior now
-dnl # offered is that of LOOKUP_PARENT. The spl already always passed
-dnl # this flag so dropping the flag does not impact us.
-dnl #
-AC_DEFUN([SPL_AC_KERN_PATH_PARENT_HEADER], [
- SPL_CHECK_SYMBOL_HEADER(
- [kern_path_parent],
- [int kern_path_parent(const char \*, struct nameidata \*)],
- [include/linux/namei.h],
- [AC_DEFINE(HAVE_KERN_PATH_PARENT_HEADER, 1,
- [kern_path_parent() is available])],
- [])
-])
-
-dnl #
-dnl # 3.1 API compat,
-dnl # The kern_path_parent() symbol is no longer exported by the kernel.
-dnl # However, it remains the prefered interface and since we still have
-dnl # access to the prototype we dynamically lookup the required address.
+dnl # 2.6.28 API change
+dnl # The kern_path() function has been introduced. We adopt it as the new way
+dnl # of looking up paths. When it is not available, we emulate it using the
+dnl # older interfaces.
dnl #
-AC_DEFUN([SPL_AC_KERN_PATH_PARENT_SYMBOL],
- [AC_MSG_CHECKING([whether kern_path_parent() is available])
+AC_DEFUN([SPL_AC_KERN_PATH],
+ [AC_MSG_CHECKING([whether kern_path() is available])
SPL_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/namei.h>
], [
- kern_path_parent(NULL, NULL);
- ], [kern_path_parent], [fs/namei.c], [
+ int r = kern_path(NULL, 0, NULL);
+ ], [kern_path], [fs/namei.c], [
AC_MSG_RESULT(yes)
- AC_DEFINE(HAVE_KERN_PATH_PARENT_SYMBOL, 1,
- [kern_path_parent() is available])
+ AC_DEFINE(HAVE_KERN_PATH, 1,
+ [kern_path() is available])
], [
AC_MSG_RESULT(no)
- ])
-])
+ AC_MSG_CHECKING([whether path_lookup() is available])
+ SPL_LINUX_TRY_COMPILE_SYMBOL([
+ #include <linux/namei.h>
+ ], [
+ int r = path_lookup(NULL, 0, NULL);
+ ], [path_lookup], [fs/namei.c], [
+ AC_MSG_RESULT(yes)
+ AC_DEFINE(HAVE_KERN_PATH, 1,
+ [kern_path() is available])
+ ], [
+ AC_MSG_RESULT(no)
+ AC_MSG_ERROR([
+ *** Neither kern_path() nor path_lookup() is available.
+ *** Please file an issue:
+ *** https://github.com/zfsonlinux/spl/issues/new])
-dnl #
-dnl # 3.6 API compat,
-dnl # The kern_path_parent() function was replaced by the kern_path_locked()
-dnl # function to eliminate all struct nameidata usage outside fs/namei.c.
-dnl #
-AC_DEFUN([SPL_AC_KERN_PATH_LOCKED], [
- SPL_CHECK_SYMBOL_HEADER(
- [kern_path_locked],
- [struct dentry \*kern_path_locked(const char \*, struct path \*)],
- [include/linux/namei.h],
- [AC_DEFINE(HAVE_KERN_PATH_LOCKED, 1,
- [kern_path_locked() is available])],
- [])
+ ])
+ ])
])
dnl #
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);
}
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, 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);
-
-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);
-
-#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,
- new_dir->d_inode, new_dentry, NULL, 0);
-#endif
-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)
{
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)
{
projects / mirror_spl.git / commitdiff