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merging pick_link() with get_link(), part 4

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Move the call of get_link() into walk_component().  Change the
calling conventions for walk_component() to returning the link
body to follow (if any).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-01-14 13:24:17 -05:00
parent 40fcf5a931
commit 92d270165c
1 changed files with 26 additions and 33 deletions
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59
fs/namei.c
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@ -1866,7 +1866,7 @@ static int step_into(struct nameidata *nd, int flags,
return pick_link(nd, &path, inode, seq); return pick_link(nd, &path, inode, seq);
} }
static int walk_component(struct nameidata *nd, int flags) static const char *walk_component(struct nameidata *nd, int flags)
{ {
struct dentry *dentry; struct dentry *dentry;
struct inode *inode; struct inode *inode;
@ -1881,19 +1881,24 @@ static int walk_component(struct nameidata *nd, int flags)
if (!(flags & WALK_MORE) && nd->depth) if (!(flags & WALK_MORE) && nd->depth)
put_link(nd); put_link(nd);
err = handle_dots(nd, nd->last_type); err = handle_dots(nd, nd->last_type);
return err; return ERR_PTR(err);
} }
dentry = lookup_fast(nd, &inode, &seq); dentry = lookup_fast(nd, &inode, &seq);
if (IS_ERR(dentry)) if (IS_ERR(dentry))
return PTR_ERR(dentry); return ERR_CAST(dentry);
if (unlikely(!dentry)) { if (unlikely(!dentry)) {
dentry = lookup_slow(&nd->last, nd->path.dentry, nd->flags); dentry = lookup_slow(&nd->last, nd->path.dentry, nd->flags);
if (IS_ERR(dentry)) if (IS_ERR(dentry))
return PTR_ERR(dentry); return ERR_CAST(dentry);
} }
if (!(flags & WALK_MORE) && nd->depth) if (!(flags & WALK_MORE) && nd->depth)
put_link(nd); put_link(nd);
return step_into(nd, flags, dentry, inode, seq); err = step_into(nd, flags, dentry, inode, seq);
if (!err)
return NULL;
if (err > 0)
return get_link(nd);
return ERR_PTR(err);
} }
/* /*
@ -2145,6 +2150,7 @@ static int link_path_walk(const char *name, struct nameidata *nd)
/* At this point we know we have a real path component. */ /* At this point we know we have a real path component. */
for(;;) { for(;;) {
const char *link;
u64 hash_len; u64 hash_len;
int type; int type;
@ -2202,24 +2208,18 @@ static int link_path_walk(const char *name, struct nameidata *nd)
if (!name) if (!name)
return 0; return 0;
/* last component of nested symlink */ /* last component of nested symlink */
err = walk_component(nd, WALK_FOLLOW); link = walk_component(nd, WALK_FOLLOW);
} else { } else {
/* not the last component */ /* not the last component */
err = walk_component(nd, WALK_FOLLOW | WALK_MORE); link = walk_component(nd, WALK_FOLLOW | WALK_MORE);
} }
if (err < 0) if (unlikely(link)) {
return err; if (IS_ERR(link))
return PTR_ERR(link);
if (err) { /* a symlink to follow */
const char *s = get_link(nd); nd->stack[nd->depth - 1].name = name;
name = link;
if (IS_ERR(s)) continue;
return PTR_ERR(s);
if (likely(s)) {
nd->stack[nd->depth - 1].name = name;
name = s;
continue;
}
} }
if (unlikely(!d_can_lookup(nd->path.dentry))) { if (unlikely(!d_can_lookup(nd->path.dentry))) {
if (nd->flags & LOOKUP_RCU) { if (nd->flags & LOOKUP_RCU) {
@ -2335,24 +2335,17 @@ static const char *path_init(struct nameidata *nd, unsigned flags)
static inline const char *lookup_last(struct nameidata *nd) static inline const char *lookup_last(struct nameidata *nd)
{ {
int err; const char *link;
if (nd->last_type == LAST_NORM && nd->last.name[nd->last.len]) if (nd->last_type == LAST_NORM && nd->last.name[nd->last.len])
nd->flags |= LOOKUP_FOLLOW | LOOKUP_DIRECTORY; nd->flags |= LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
nd->flags &= ~LOOKUP_PARENT; nd->flags &= ~LOOKUP_PARENT;
err = walk_component(nd, 0); link = walk_component(nd, 0);
if (unlikely(err)) { if (link) {
const char *s; nd->flags |= LOOKUP_PARENT;
if (err < 0) nd->stack[0].name = NULL;
return PTR_ERR(err);
s = get_link(nd);
if (s) {
nd->flags |= LOOKUP_PARENT;
nd->stack[0].name = NULL;
return s;
}
} }
return NULL; return link;
} }
static int handle_lookup_down(struct nameidata *nd) static int handle_lookup_down(struct nameidata *nd)