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VFS: trivial optimization

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* (vfs_s_opendir): test if path is invalid or not ASAP.
  * (vfs_s_readlink): likewise.
  * (vfs_s_open): likewise.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
This commit is contained in:
Andrew Borodin 2019-05-20 13:47:43 +03:00
parent 9df841478b
commit 651c3539b6
1 changed files with 8 additions and 6 deletions
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14
lib/vfs/direntry.c
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@ -420,11 +420,12 @@ vfs_s_opendir (const vfs_path_t * vpath)
struct dirhandle *info;
const vfs_path_element_t *path_element;
path_element = vfs_path_get_by_index (vpath, -1);
dir = vfs_s_inode_from_path (vpath, FL_DIR | FL_FOLLOW);
if (dir == NULL)
return NULL;
path_element = vfs_path_get_by_index (vpath, -1);
if (!S_ISDIR (dir->st.st_mode))
{
path_element->class->verrno = ENOTDIR;
@ -520,12 +521,12 @@ vfs_s_readlink (const vfs_path_t * vpath, char *buf, size_t size)
size_t len;
const vfs_path_element_t *path_element;
path_element = vfs_path_get_by_index (vpath, -1);
ino = vfs_s_inode_from_path (vpath, 0);
if (ino == NULL)
return (-1);
path_element = vfs_path_get_by_index (vpath, -1);
if (!S_ISLNK (ino->st.st_mode))
{
path_element->class->verrno = EINVAL;
@ -1287,11 +1288,12 @@ vfs_s_open (const vfs_path_t * vpath, int flags, mode_t mode)
const vfs_path_element_t *path_element;
struct vfs_s_subclass *s;
path_element = vfs_path_get_by_index (vpath, -1);
q = vfs_s_get_path (vpath, &super, 0);
if (q == NULL)
return NULL;
path_element = vfs_path_get_by_index (vpath, -1);
ino = vfs_s_find_inode (path_element->class, super, q, LINK_FOLLOW, FL_NONE);
if (ino != NULL && (flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
{