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Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c127
1 files changed, 66 insertions, 61 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 1f5d86d1fbf..9a6456099f1 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1359,22 +1359,6 @@ static inline int may_create(struct inode *dir, struct dentry *child)
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.
*/
@@ -1631,19 +1615,60 @@ exit:
static struct file *do_last(struct nameidata *nd, struct path *path,
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 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;
+ }
- error = -EISDIR;
- if (nd->last_type != LAST_NORM || nd->last.name[nd->last.len])
- goto exit;
+ /* trailing slashes? */
+ if (nd->last.name[nd->last.len]) {
+ 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);
path->dentry = lookup_hash(nd);
@@ -1746,6 +1771,10 @@ struct file *do_filp_open(int dfd, const char *pathname,
int count = 0;
int flag = open_to_namei_flags(open_flag);
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
@@ -1768,35 +1797,7 @@ struct file *do_filp_open(int dfd, const char *pathname,
if (open_flag & O_APPEND)
acc_mode |= MAY_APPEND;
- /*
- * 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.
- */
+ /* find the parent */
reval:
error = path_init(dfd, pathname, LOOKUP_PARENT, &nd);
if (error)
@@ -1810,7 +1811,7 @@ reval:
filp = ERR_PTR(error);
goto out;
}
- if (unlikely(!audit_dummy_context()))
+ if (unlikely(!audit_dummy_context()) && (open_flag & O_CREAT))
audit_inode(pathname, nd.path.dentry);
/*
@@ -1826,16 +1827,22 @@ reval:
nd.intent.open.flags = flag;
nd.intent.open.create_mode = mode;
nd.flags &= ~LOOKUP_PARENT;
- nd.flags |= LOOKUP_CREATE | LOOKUP_OPEN;
- if (open_flag & O_EXCL)
- nd.flags |= LOOKUP_EXCL;
- filp = do_last(&nd, &path, open_flag, acc_mode, mode, pathname);
+ nd.flags |= LOOKUP_OPEN;
+ if (open_flag & O_CREAT) {
+ nd.flags |= LOOKUP_CREATE;
+ 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 */
struct path holder;
- struct inode *inode;
+ struct inode *inode = path.dentry->d_inode;
void *cookie;
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;
/*
* This is subtle. Instead of calling do_follow_link() we do
@@ -1855,7 +1862,6 @@ reval:
error = __do_follow_link(&path, &nd, &cookie);
if (unlikely(error)) {
/* nd.path had been dropped */
- inode = path.dentry->d_inode;
if (!IS_ERR(cookie) && inode->i_op->put_link)
inode->i_op->put_link(path.dentry, &nd, cookie);
path_put(&path);
@@ -1865,8 +1871,7 @@ reval:
}
holder = path;
nd.flags &= ~LOOKUP_PARENT;
- filp = do_last(&nd, &path, open_flag, acc_mode, mode, pathname);
- inode = holder.dentry->d_inode;
+ filp = do_last(&nd, &path, open_flag, acc_mode, mode, pathname, &want_dir);
if (inode->i_op->put_link)
inode->i_op->put_link(holder.dentry, &nd, cookie);
path_put(&holder);