mirror of https://gitee.com/openkylin/linux.git
fs/namei.c: get do_last() and friends return int
Same conventions as for ->atomic_open(). Trimmed the forest of labels a bit, while we are at it... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
30d9049474
commit
2675a4eb6a
150
fs/namei.c
150
fs/namei.c
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@ -2193,18 +2193,17 @@ static int may_o_create(struct path *dir, struct dentry *dentry, umode_t mode)
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return security_inode_create(dir->dentry->d_inode, dentry, mode);
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}
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static struct file *atomic_open(struct nameidata *nd, struct dentry *dentry,
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struct path *path, struct file *file,
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const struct open_flags *op,
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bool *want_write, bool need_lookup,
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int *opened)
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static int atomic_open(struct nameidata *nd, struct dentry *dentry,
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struct path *path, struct file *file,
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const struct open_flags *op,
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bool *want_write, bool need_lookup,
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int *opened)
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{
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struct inode *dir = nd->path.dentry->d_inode;
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unsigned open_flag = open_to_namei_flags(op->open_flag);
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umode_t mode;
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int error;
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int acc_mode;
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struct file *filp = NULL;
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int create_error = 0;
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struct dentry *const DENTRY_NOT_SET = (void *) -1UL;
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@ -2212,7 +2211,7 @@ static struct file *atomic_open(struct nameidata *nd, struct dentry *dentry,
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/* Don't create child dentry for a dead directory. */
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if (unlikely(IS_DEADDIR(dir))) {
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filp = ERR_PTR(-ENOENT);
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error = -ENOENT;
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goto out;
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}
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@ -2276,7 +2275,6 @@ static struct file *atomic_open(struct nameidata *nd, struct dentry *dentry,
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if (error < 0) {
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if (create_error && error == -ENOENT)
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error = create_error;
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filp = ERR_PTR(error);
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goto out;
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}
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@ -2288,7 +2286,7 @@ static struct file *atomic_open(struct nameidata *nd, struct dentry *dentry,
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if (error) { /* returned 1, that is */
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if (WARN_ON(file->f_path.dentry == DENTRY_NOT_SET)) {
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filp = ERR_PTR(-EIO);
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error = -EIO;
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goto out;
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}
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if (file->f_path.dentry) {
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@ -2302,27 +2300,24 @@ static struct file *atomic_open(struct nameidata *nd, struct dentry *dentry,
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* We didn't have the inode before the open, so check open permission
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* here.
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*/
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filp = file;
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error = may_open(&filp->f_path, acc_mode, open_flag);
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if (error) {
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fput(filp);
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filp = ERR_PTR(error);
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}
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error = may_open(&file->f_path, acc_mode, open_flag);
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if (error)
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fput(file);
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out:
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dput(dentry);
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return filp;
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return error;
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no_open:
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if (need_lookup) {
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dentry = lookup_real(dir, dentry, nd);
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if (IS_ERR(dentry))
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return ERR_CAST(dentry);
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return PTR_ERR(dentry);
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if (create_error) {
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int open_flag = op->open_flag;
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filp = ERR_PTR(create_error);
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error = create_error;
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if ((open_flag & O_EXCL)) {
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if (!dentry->d_inode)
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goto out;
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@ -2338,7 +2333,7 @@ static struct file *atomic_open(struct nameidata *nd, struct dentry *dentry,
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looked_up:
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path->dentry = dentry;
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path->mnt = nd->path.mnt;
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return NULL;
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return 1;
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}
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/*
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@ -2349,10 +2344,10 @@ static struct file *atomic_open(struct nameidata *nd, struct dentry *dentry,
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* Returns open file or NULL on success, error otherwise. NULL means no open
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* was performed, only lookup.
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*/
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static struct file *lookup_open(struct nameidata *nd, struct path *path,
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struct file *file,
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const struct open_flags *op,
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bool *want_write, int *opened)
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static int lookup_open(struct nameidata *nd, struct path *path,
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struct file *file,
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const struct open_flags *op,
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bool *want_write, int *opened)
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{
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struct dentry *dir = nd->path.dentry;
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struct inode *dir_inode = dir->d_inode;
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@ -2363,7 +2358,7 @@ static struct file *lookup_open(struct nameidata *nd, struct path *path,
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*opened &= ~FILE_CREATED;
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dentry = lookup_dcache(&nd->last, dir, nd, &need_lookup);
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if (IS_ERR(dentry))
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return ERR_CAST(dentry);
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return PTR_ERR(dentry);
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/* Cached positive dentry: will open in f_op->open */
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if (!need_lookup && dentry->d_inode)
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@ -2379,7 +2374,7 @@ static struct file *lookup_open(struct nameidata *nd, struct path *path,
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dentry = lookup_real(dir_inode, dentry, nd);
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if (IS_ERR(dentry))
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return ERR_CAST(dentry);
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return PTR_ERR(dentry);
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}
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/* Negative dentry, just create the file */
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@ -2409,26 +2404,25 @@ static struct file *lookup_open(struct nameidata *nd, struct path *path,
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out_no_open:
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path->dentry = dentry;
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path->mnt = nd->path.mnt;
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return NULL;
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return 1;
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out_dput:
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dput(dentry);
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return ERR_PTR(error);
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return error;
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}
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/*
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* Handle the last step of open()
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*/
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static struct file *do_last(struct nameidata *nd, struct path *path,
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struct file *file, const struct open_flags *op,
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int *opened, const char *pathname)
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static int do_last(struct nameidata *nd, struct path *path,
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struct file *file, const struct open_flags *op,
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int *opened, const char *pathname)
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{
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struct dentry *dir = nd->path.dentry;
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int open_flag = op->open_flag;
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bool will_truncate = (open_flag & O_TRUNC) != 0;
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bool want_write = false;
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int acc_mode = op->acc_mode;
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struct file *filp;
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struct inode *inode;
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bool symlink_ok = false;
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struct path save_parent = { .dentry = NULL, .mnt = NULL };
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@ -2443,22 +2437,22 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
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case LAST_DOT:
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error = handle_dots(nd, nd->last_type);
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if (error)
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return ERR_PTR(error);
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return error;
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/* fallthrough */
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case LAST_ROOT:
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error = complete_walk(nd);
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if (error)
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return ERR_PTR(error);
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return error;
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audit_inode(pathname, nd->path.dentry);
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if (open_flag & O_CREAT) {
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error = -EISDIR;
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goto exit;
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goto out;
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}
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goto finish_open;
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case LAST_BIND:
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error = complete_walk(nd);
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if (error)
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return ERR_PTR(error);
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return error;
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audit_inode(pathname, dir);
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goto finish_open;
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}
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@ -2474,7 +2468,7 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
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goto finish_lookup;
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if (error < 0)
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goto exit;
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goto out;
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BUG_ON(nd->inode != dir->d_inode);
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} else {
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@ -2486,29 +2480,29 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
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*/
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error = complete_walk(nd);
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if (error)
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return ERR_PTR(error);
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return error;
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audit_inode(pathname, dir);
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error = -EISDIR;
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/* trailing slashes? */
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if (nd->last.name[nd->last.len])
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goto exit;
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goto out;
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}
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retry_lookup:
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mutex_lock(&dir->d_inode->i_mutex);
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filp = lookup_open(nd, path, file, op, &want_write, opened);
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error = lookup_open(nd, path, file, op, &want_write, opened);
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mutex_unlock(&dir->d_inode->i_mutex);
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if (filp) {
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if (IS_ERR(filp))
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if (error <= 0) {
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if (error)
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goto out;
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if ((*opened & FILE_CREATED) ||
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!S_ISREG(filp->f_path.dentry->d_inode->i_mode))
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!S_ISREG(file->f_path.dentry->d_inode->i_mode))
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will_truncate = false;
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audit_inode(pathname, filp->f_path.dentry);
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audit_inode(pathname, file->f_path.dentry);
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goto opened;
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}
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@ -2554,18 +2548,18 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
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error = -ENOENT;
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if (!inode) {
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path_to_nameidata(path, nd);
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goto exit;
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goto out;
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}
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if (should_follow_link(inode, !symlink_ok)) {
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if (nd->flags & LOOKUP_RCU) {
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if (unlikely(unlazy_walk(nd, path->dentry))) {
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error = -ECHILD;
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goto exit;
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goto out;
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}
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}
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BUG_ON(inode != path->dentry->d_inode);
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return NULL;
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return 1;
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}
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if ((nd->flags & LOOKUP_RCU) || nd->path.mnt != path->mnt) {
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@ -2581,14 +2575,14 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
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error = complete_walk(nd);
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if (error) {
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path_put(&save_parent);
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return ERR_PTR(error);
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return error;
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}
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error = -EISDIR;
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if ((open_flag & O_CREAT) && S_ISDIR(nd->inode->i_mode))
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goto exit;
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goto out;
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error = -ENOTDIR;
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if ((nd->flags & LOOKUP_DIRECTORY) && !nd->inode->i_op->lookup)
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goto exit;
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goto out;
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audit_inode(pathname, nd->path.dentry);
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finish_open:
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if (!S_ISREG(nd->inode->i_mode))
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@ -2597,32 +2591,30 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
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if (will_truncate) {
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error = mnt_want_write(nd->path.mnt);
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if (error)
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goto exit;
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goto out;
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want_write = true;
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}
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finish_open_created:
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error = may_open(&nd->path, acc_mode, open_flag);
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if (error)
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goto exit;
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goto out;
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file->f_path.mnt = nd->path.mnt;
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error = finish_open(file, nd->path.dentry, NULL, opened);
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if (error) {
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filp = ERR_PTR(error);
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if (error == -EOPENSTALE)
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goto stale_open;
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goto out;
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}
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filp = file;
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opened:
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error = open_check_o_direct(filp);
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error = open_check_o_direct(file);
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if (error)
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goto exit_fput;
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error = ima_file_check(filp, op->acc_mode);
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error = ima_file_check(file, op->acc_mode);
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if (error)
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goto exit_fput;
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if (will_truncate) {
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error = handle_truncate(filp);
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error = handle_truncate(file);
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if (error)
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goto exit_fput;
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}
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@ -2631,16 +2623,14 @@ static struct file *do_last(struct nameidata *nd, struct path *path,
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mnt_drop_write(nd->path.mnt);
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path_put(&save_parent);
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terminate_walk(nd);
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return filp;
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return error;
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exit_dput:
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path_put_conditional(path, nd);
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exit:
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filp = ERR_PTR(error);
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goto out;
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exit_fput:
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fput(filp);
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goto exit;
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fput(file);
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goto out;
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stale_open:
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/* If no saved parent or already retried then can't retry */
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@ -2666,7 +2656,6 @@ static struct file *path_openat(int dfd, const char *pathname,
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{
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struct file *base = NULL;
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struct file *file;
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struct file *res;
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struct path path;
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int opened = 0;
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int error;
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@ -2679,29 +2668,29 @@ static struct file *path_openat(int dfd, const char *pathname,
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error = path_init(dfd, pathname, flags | LOOKUP_PARENT, nd, &base);
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if (unlikely(error))
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goto out_filp;
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goto out;
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current->total_link_count = 0;
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error = link_path_walk(pathname, nd);
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if (unlikely(error))
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goto out_filp;
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goto out;
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res = do_last(nd, &path, file, op, &opened, pathname);
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while (unlikely(!res)) { /* trailing symlink */
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error = do_last(nd, &path, file, op, &opened, pathname);
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while (unlikely(error > 0)) { /* trailing symlink */
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struct path link = path;
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void *cookie;
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if (!(nd->flags & LOOKUP_FOLLOW)) {
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path_put_conditional(&path, nd);
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path_put(&nd->path);
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res = ERR_PTR(-ELOOP);
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error = -ELOOP;
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break;
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}
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nd->flags |= LOOKUP_PARENT;
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nd->flags &= ~(LOOKUP_OPEN|LOOKUP_CREATE|LOOKUP_EXCL);
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error = follow_link(&link, nd, &cookie);
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if (unlikely(error))
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goto out_filp;
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res = do_last(nd, &path, file, op, &opened, pathname);
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break;
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error = do_last(nd, &path, file, op, &opened, pathname);
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put_link(nd, &link, cookie);
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}
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out:
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@ -2709,19 +2698,20 @@ static struct file *path_openat(int dfd, const char *pathname,
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path_put(&nd->root);
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if (base)
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fput(base);
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if (!(opened & FILE_OPENED))
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if (!(opened & FILE_OPENED)) {
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BUG_ON(!error);
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put_filp(file);
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if (res == ERR_PTR(-EOPENSTALE)) {
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if (flags & LOOKUP_RCU)
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res = ERR_PTR(-ECHILD);
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else
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res = ERR_PTR(-ESTALE);
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}
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return res;
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out_filp:
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res = ERR_PTR(error);
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goto out;
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if (unlikely(error)) {
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if (error == -EOPENSTALE) {
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if (flags & LOOKUP_RCU)
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error = -ECHILD;
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else
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error = -ESTALE;
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}
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file = ERR_PTR(error);
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}
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return file;
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}
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struct file *do_filp_open(int dfd, const char *pathname,
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