return -ENOENT;
BUG_ON(victim->d_parent->d_inode != dir);
- audit_inode_child(victim->d_name.name, victim, dir);
+ audit_inode_child(victim, dir);
error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
if (error)
return (flag & O_TRUNC);
}
+static struct file *finish_open(struct nameidata *nd,
+ int open_flag, int flag, int acc_mode)
+{
+ struct file *filp;
+ int will_truncate;
+ int error;
+
+ will_truncate = open_will_truncate(flag, nd->path.dentry->d_inode);
+ if (will_truncate) {
+ error = mnt_want_write(nd->path.mnt);
+ if (error)
+ goto exit;
+ }
+ error = may_open(&nd->path, acc_mode, open_flag);
+ if (error) {
+ if (will_truncate)
+ mnt_drop_write(nd->path.mnt);
+ goto exit;
+ }
+ filp = nameidata_to_filp(nd);
+ if (!IS_ERR(filp)) {
+ error = ima_file_check(filp, acc_mode);
+ if (error) {
+ fput(filp);
+ filp = ERR_PTR(error);
+ }
+ }
+ if (!IS_ERR(filp)) {
+ if (acc_mode & MAY_WRITE)
+ vfs_dq_init(nd->path.dentry->d_inode);
+
+ if (will_truncate) {
+ error = handle_truncate(&nd->path);
+ if (error) {
+ fput(filp);
+ filp = ERR_PTR(error);
+ }
+ }
+ }
+ /*
+ * It is now safe to drop the mnt write
+ * because the filp has had a write taken
+ * on its behalf.
+ */
+ if (will_truncate)
+ mnt_drop_write(nd->path.mnt);
+ return filp;
+
+exit:
+ if (!IS_ERR(nd->intent.open.file))
+ release_open_intent(nd);
+ path_put(&nd->path);
+ return ERR_PTR(error);
+}
+
+static struct file *do_last(struct nameidata *nd, struct path *path,
+ int open_flag, int flag, int acc_mode,
+ int mode, const char *pathname,
+ struct dentry *dir, int *is_link)
+{
+ struct file *filp;
+ int error;
+
+ *is_link = 0;
+
+ error = PTR_ERR(path->dentry);
+ if (IS_ERR(path->dentry)) {
+ mutex_unlock(&dir->d_inode->i_mutex);
+ goto exit;
+ }
+
+ if (IS_ERR(nd->intent.open.file)) {
+ error = PTR_ERR(nd->intent.open.file);
+ goto exit_mutex_unlock;
+ }
+
+ /* Negative dentry, just create the file */
+ if (!path->dentry->d_inode) {
+ /*
+ * This write is needed to ensure that a
+ * ro->rw transition does not occur between
+ * the time when the file is created and when
+ * a permanent write count is taken through
+ * the 'struct file' in nameidata_to_filp().
+ */
+ error = mnt_want_write(nd->path.mnt);
+ if (error)
+ goto exit_mutex_unlock;
+ error = __open_namei_create(nd, path, open_flag, mode);
+ if (error) {
+ mnt_drop_write(nd->path.mnt);
+ goto exit;
+ }
+ filp = nameidata_to_filp(nd);
+ mnt_drop_write(nd->path.mnt);
+ if (!IS_ERR(filp)) {
+ error = ima_file_check(filp, acc_mode);
+ if (error) {
+ fput(filp);
+ filp = ERR_PTR(error);
+ }
+ }
+ return filp;
+ }
+
+ /*
+ * It already exists.
+ */
+ mutex_unlock(&dir->d_inode->i_mutex);
+ audit_inode(pathname, path->dentry);
+
+ error = -EEXIST;
+ if (flag & O_EXCL)
+ goto exit_dput;
+
+ if (__follow_mount(path)) {
+ error = -ELOOP;
+ if (flag & O_NOFOLLOW)
+ goto exit_dput;
+ }
+
+ error = -ENOENT;
+ if (!path->dentry->d_inode)
+ goto exit_dput;
+ if (path->dentry->d_inode->i_op->follow_link) {
+ *is_link = 1;
+ return NULL;
+ }
+
+ path_to_nameidata(path, nd);
+ error = -EISDIR;
+ if (S_ISDIR(path->dentry->d_inode->i_mode))
+ goto exit;
+ filp = finish_open(nd, open_flag, flag, acc_mode);
+ return filp;
+
+exit_mutex_unlock:
+ mutex_unlock(&dir->d_inode->i_mutex);
+exit_dput:
+ path_put_conditional(path, nd);
+exit:
+ if (!IS_ERR(nd->intent.open.file))
+ release_open_intent(nd);
+ path_put(&nd->path);
+ return ERR_PTR(error);
+}
+
/*
* Note that the low bits of the passed in "open_flag"
* are not the same as in the local variable "flag". See
struct path path;
struct dentry *dir;
int count = 0;
- int will_truncate;
int flag = open_to_namei_flags(open_flag);
int force_reval = 0;
+ int is_link;
/*
* O_SYNC is implemented as __O_SYNC|O_DSYNC. As many places only
mutex_lock(&dir->d_inode->i_mutex);
path.dentry = lookup_hash(&nd);
path.mnt = nd.path.mnt;
-
-do_last:
- error = PTR_ERR(path.dentry);
- if (IS_ERR(path.dentry)) {
- mutex_unlock(&dir->d_inode->i_mutex);
- goto exit;
- }
-
- if (IS_ERR(nd.intent.open.file)) {
- error = PTR_ERR(nd.intent.open.file);
- goto exit_mutex_unlock;
- }
-
- /* Negative dentry, just create the file */
- if (!path.dentry->d_inode) {
- /*
- * This write is needed to ensure that a
- * ro->rw transition does not occur between
- * the time when the file is created and when
- * a permanent write count is taken through
- * the 'struct file' in nameidata_to_filp().
- */
- error = mnt_want_write(nd.path.mnt);
- if (error)
- goto exit_mutex_unlock;
- error = __open_namei_create(&nd, &path, open_flag, mode);
- if (error) {
- mnt_drop_write(nd.path.mnt);
- goto exit;
- }
- filp = nameidata_to_filp(&nd);
- mnt_drop_write(nd.path.mnt);
- if (nd.root.mnt)
- path_put(&nd.root);
- if (!IS_ERR(filp)) {
- error = ima_file_check(filp, acc_mode);
- if (error) {
- fput(filp);
- filp = ERR_PTR(error);
- }
- }
- return filp;
- }
-
- /*
- * It already exists.
- */
- mutex_unlock(&dir->d_inode->i_mutex);
- audit_inode(pathname, path.dentry);
-
- error = -EEXIST;
- if (flag & O_EXCL)
- goto exit_dput;
-
- if (__follow_mount(&path)) {
- error = -ELOOP;
- if (flag & O_NOFOLLOW)
- goto exit_dput;
- }
-
- error = -ENOENT;
- if (!path.dentry->d_inode)
- goto exit_dput;
- if (path.dentry->d_inode->i_op->follow_link)
+ filp = do_last(&nd, &path, open_flag, flag, acc_mode, mode,
+ pathname, dir, &is_link);
+ if (is_link)
goto do_link;
+ if (nd.root.mnt)
+ path_put(&nd.root);
+ return filp;
- path_to_nameidata(&path, &nd);
- error = -EISDIR;
- if (S_ISDIR(path.dentry->d_inode->i_mode))
- goto exit;
ok:
- /*
- * Consider:
- * 1. may_open() truncates a file
- * 2. a rw->ro mount transition occurs
- * 3. nameidata_to_filp() fails due to
- * the ro mount.
- * That would be inconsistent, and should
- * be avoided. Taking this mnt write here
- * ensures that (2) can not occur.
- */
- will_truncate = open_will_truncate(flag, nd.path.dentry->d_inode);
- if (will_truncate) {
- error = mnt_want_write(nd.path.mnt);
- if (error)
- goto exit;
- }
- error = may_open(&nd.path, acc_mode, open_flag);
- if (error) {
- if (will_truncate)
- mnt_drop_write(nd.path.mnt);
- goto exit;
- }
- filp = nameidata_to_filp(&nd);
- if (!IS_ERR(filp)) {
- error = ima_file_check(filp, acc_mode);
- if (error) {
- fput(filp);
- filp = ERR_PTR(error);
- }
- }
- if (!IS_ERR(filp)) {
- if (acc_mode & MAY_WRITE)
- vfs_dq_init(nd.path.dentry->d_inode);
-
- if (will_truncate) {
- error = handle_truncate(&nd.path);
- if (error) {
- fput(filp);
- filp = ERR_PTR(error);
- }
- }
- }
- /*
- * It is now safe to drop the mnt write
- * because the filp has had a write taken
- * on its behalf.
- */
- if (will_truncate)
- mnt_drop_write(nd.path.mnt);
+ filp = finish_open(&nd, open_flag, flag, acc_mode);
if (nd.root.mnt)
path_put(&nd.root);
return filp;
-exit_mutex_unlock:
- mutex_unlock(&dir->d_inode->i_mutex);
exit_dput:
path_put_conditional(&path, &nd);
exit:
path.dentry = lookup_hash(&nd);
path.mnt = nd.path.mnt;
__putname(nd.last.name);
- goto do_last;
+ filp = do_last(&nd, &path, open_flag, flag, acc_mode, mode,
+ pathname, dir, &is_link);
+ if (is_link)
+ goto do_link;
+ if (nd.root.mnt)
+ path_put(&nd.root);
+ return filp;
}
/**
error = vfs_rename_dir(old_dir,old_dentry,new_dir,new_dentry);
else
error = vfs_rename_other(old_dir,old_dentry,new_dir,new_dentry);
- if (!error) {
- const char *new_name = old_dentry->d_name.name;
- fsnotify_move(old_dir, new_dir, old_name, new_name, is_dir,
+ if (!error)
+ fsnotify_move(old_dir, new_dir, old_name, is_dir,
new_dentry->d_inode, old_dentry);
- }
fsnotify_oldname_free(old_name);
return error;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff