Commit 1f36f774 authored by Al Viro's avatar Al Viro

Switch !O_CREAT case to use of do_last()

... and now we have all intents crap well localized
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent def4af30
...@@ -1359,22 +1359,6 @@ static inline int may_create(struct inode *dir, struct dentry *child) ...@@ -1359,22 +1359,6 @@ static inline int may_create(struct inode *dir, struct dentry *child)
return inode_permission(dir, MAY_WRITE | MAY_EXEC); return inode_permission(dir, MAY_WRITE | MAY_EXEC);
} }
/*
* O_DIRECTORY translates into forcing a directory lookup.
*/
static inline int lookup_flags(unsigned int f)
{
unsigned long retval = LOOKUP_FOLLOW;
if (f & O_NOFOLLOW)
retval &= ~LOOKUP_FOLLOW;
if (f & O_DIRECTORY)
retval |= LOOKUP_DIRECTORY;
return retval;
}
/* /*
* p1 and p2 should be directories on the same fs. * p1 and p2 should be directories on the same fs.
*/ */
...@@ -1631,19 +1615,60 @@ static struct file *finish_open(struct nameidata *nd, ...@@ -1631,19 +1615,60 @@ static struct file *finish_open(struct nameidata *nd,
static struct file *do_last(struct nameidata *nd, struct path *path, static struct file *do_last(struct nameidata *nd, struct path *path,
int open_flag, int acc_mode, int open_flag, int acc_mode,
int mode, const char *pathname) int mode, const char *pathname,
int *want_dir)
{ {
struct dentry *dir = nd->path.dentry; struct dentry *dir = nd->path.dentry;
struct file *filp; struct file *filp;
int error; int error = -EISDIR;
if (nd->last_type == LAST_BIND) switch (nd->last_type) {
case LAST_DOTDOT:
follow_dotdot(nd);
dir = nd->path.dentry;
if (nd->path.mnt->mnt_sb->s_type->fs_flags & FS_REVAL_DOT) {
if (!dir->d_op->d_revalidate(dir, nd)) {
error = -ESTALE;
goto exit;
}
}
/* fallthrough */
case LAST_DOT:
case LAST_ROOT:
if (open_flag & O_CREAT)
goto exit;
/* fallthrough */
case LAST_BIND:
audit_inode(pathname, dir);
goto ok; goto ok;
}
error = -EISDIR; /* trailing slashes? */
if (nd->last_type != LAST_NORM || nd->last.name[nd->last.len]) if (nd->last.name[nd->last.len]) {
goto exit; if (open_flag & O_CREAT)
goto exit;
*want_dir = 1;
}
/* just plain open? */
if (!(open_flag & O_CREAT)) {
error = do_lookup(nd, &nd->last, path);
if (error)
goto exit;
error = -ENOENT;
if (!path->dentry->d_inode)
goto exit_dput;
if (path->dentry->d_inode->i_op->follow_link)
return NULL;
error = -ENOTDIR;
if (*want_dir & !path->dentry->d_inode->i_op->lookup)
goto exit_dput;
path_to_nameidata(path, nd);
audit_inode(pathname, nd->path.dentry);
goto ok;
}
/* OK, it's O_CREAT */
mutex_lock(&dir->d_inode->i_mutex); mutex_lock(&dir->d_inode->i_mutex);
path->dentry = lookup_hash(nd); path->dentry = lookup_hash(nd);
...@@ -1746,6 +1771,10 @@ struct file *do_filp_open(int dfd, const char *pathname, ...@@ -1746,6 +1771,10 @@ struct file *do_filp_open(int dfd, const char *pathname,
int count = 0; int count = 0;
int flag = open_to_namei_flags(open_flag); int flag = open_to_namei_flags(open_flag);
int force_reval = 0; int force_reval = 0;
int want_dir = open_flag & O_DIRECTORY;
if (!(open_flag & O_CREAT))
mode = 0;
/* /*
* O_SYNC is implemented as __O_SYNC|O_DSYNC. As many places only * O_SYNC is implemented as __O_SYNC|O_DSYNC. As many places only
...@@ -1768,35 +1797,7 @@ struct file *do_filp_open(int dfd, const char *pathname, ...@@ -1768,35 +1797,7 @@ struct file *do_filp_open(int dfd, const char *pathname,
if (open_flag & O_APPEND) if (open_flag & O_APPEND)
acc_mode |= MAY_APPEND; acc_mode |= MAY_APPEND;
/* /* find the parent */
* The simplest case - just a plain lookup.
*/
if (!(open_flag & O_CREAT)) {
filp = get_empty_filp();
if (filp == NULL)
return ERR_PTR(-ENFILE);
nd.intent.open.file = filp;
filp->f_flags = open_flag;
nd.intent.open.flags = flag;
nd.intent.open.create_mode = 0;
error = do_path_lookup(dfd, pathname,
lookup_flags(open_flag)|LOOKUP_OPEN, &nd);
if (IS_ERR(nd.intent.open.file)) {
if (error == 0) {
error = PTR_ERR(nd.intent.open.file);
path_put(&nd.path);
}
} else if (error)
release_open_intent(&nd);
if (error)
return ERR_PTR(error);
return finish_open(&nd, open_flag, acc_mode);
}
/*
* Create - we need to know the parent.
*/
reval: reval:
error = path_init(dfd, pathname, LOOKUP_PARENT, &nd); error = path_init(dfd, pathname, LOOKUP_PARENT, &nd);
if (error) if (error)
...@@ -1810,7 +1811,7 @@ struct file *do_filp_open(int dfd, const char *pathname, ...@@ -1810,7 +1811,7 @@ struct file *do_filp_open(int dfd, const char *pathname,
filp = ERR_PTR(error); filp = ERR_PTR(error);
goto out; goto out;
} }
if (unlikely(!audit_dummy_context())) if (unlikely(!audit_dummy_context()) && (open_flag & O_CREAT))
audit_inode(pathname, nd.path.dentry); audit_inode(pathname, nd.path.dentry);
/* /*
...@@ -1826,16 +1827,22 @@ struct file *do_filp_open(int dfd, const char *pathname, ...@@ -1826,16 +1827,22 @@ struct file *do_filp_open(int dfd, const char *pathname,
nd.intent.open.flags = flag; nd.intent.open.flags = flag;
nd.intent.open.create_mode = mode; nd.intent.open.create_mode = mode;
nd.flags &= ~LOOKUP_PARENT; nd.flags &= ~LOOKUP_PARENT;
nd.flags |= LOOKUP_CREATE | LOOKUP_OPEN; nd.flags |= LOOKUP_OPEN;
if (open_flag & O_EXCL) if (open_flag & O_CREAT) {
nd.flags |= LOOKUP_EXCL; nd.flags |= LOOKUP_CREATE;
filp = do_last(&nd, &path, open_flag, acc_mode, mode, pathname); if (open_flag & O_EXCL)
nd.flags |= LOOKUP_EXCL;
}
filp = do_last(&nd, &path, open_flag, acc_mode, mode, pathname, &want_dir);
while (unlikely(!filp)) { /* trailing symlink */ while (unlikely(!filp)) { /* trailing symlink */
struct path holder; struct path holder;
struct inode *inode; struct inode *inode = path.dentry->d_inode;
void *cookie; void *cookie;
error = -ELOOP; error = -ELOOP;
if ((open_flag & O_NOFOLLOW) || count++ == 32) /* S_ISDIR part is a temporary automount kludge */
if ((open_flag & O_NOFOLLOW) && !S_ISDIR(inode->i_mode))
goto exit_dput;
if (count++ == 32)
goto exit_dput; goto exit_dput;
/* /*
* This is subtle. Instead of calling do_follow_link() we do * This is subtle. Instead of calling do_follow_link() we do
...@@ -1855,7 +1862,6 @@ struct file *do_filp_open(int dfd, const char *pathname, ...@@ -1855,7 +1862,6 @@ struct file *do_filp_open(int dfd, const char *pathname,
error = __do_follow_link(&path, &nd, &cookie); error = __do_follow_link(&path, &nd, &cookie);
if (unlikely(error)) { if (unlikely(error)) {
/* nd.path had been dropped */ /* nd.path had been dropped */
inode = path.dentry->d_inode;
if (!IS_ERR(cookie) && inode->i_op->put_link) if (!IS_ERR(cookie) && inode->i_op->put_link)
inode->i_op->put_link(path.dentry, &nd, cookie); inode->i_op->put_link(path.dentry, &nd, cookie);
path_put(&path); path_put(&path);
...@@ -1865,8 +1871,7 @@ struct file *do_filp_open(int dfd, const char *pathname, ...@@ -1865,8 +1871,7 @@ struct file *do_filp_open(int dfd, const char *pathname,
} }
holder = path; holder = path;
nd.flags &= ~LOOKUP_PARENT; nd.flags &= ~LOOKUP_PARENT;
filp = do_last(&nd, &path, open_flag, acc_mode, mode, pathname); filp = do_last(&nd, &path, open_flag, acc_mode, mode, pathname, &want_dir);
inode = holder.dentry->d_inode;
if (inode->i_op->put_link) if (inode->i_op->put_link)
inode->i_op->put_link(holder.dentry, &nd, cookie); inode->i_op->put_link(holder.dentry, &nd, cookie);
path_put(&holder); path_put(&holder);
......
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