forked from Minki/linux
9p: implement i_op->atomic_open()
Add an ->atomic_open implementation which replaces the atomic open+create operation implemented via ->create. No functionality is changed. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> CC: Eric Van Hensbergen <ericvh@gmail.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Miklos Szeredi
Al Viro
parent
2d83bde9a1
commit
e43ae79c54
@ -712,11 +712,14 @@ error:
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}
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/**
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* v9fs_vfs_create - VFS hook to create files
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* v9fs_vfs_create - VFS hook to create a regular file
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*
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* open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
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* for mknod(2).
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*
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* @dir: directory inode that is being created
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* @dentry: dentry that is being deleted
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* @mode: create permissions
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* @nd: path information
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*
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*/
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@ -724,76 +727,19 @@ static int
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v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
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struct nameidata *nd)
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{
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int err;
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u32 perm;
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int flags;
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struct file *filp;
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struct v9fs_inode *v9inode;
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struct v9fs_session_info *v9ses;
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struct p9_fid *fid, *inode_fid;
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struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
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u32 perm = unixmode2p9mode(v9ses, mode);
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struct p9_fid *fid;
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err = 0;
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fid = NULL;
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v9ses = v9fs_inode2v9ses(dir);
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perm = unixmode2p9mode(v9ses, mode);
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if (nd)
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flags = nd->intent.open.flags;
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else
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flags = O_RDWR;
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fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
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v9fs_uflags2omode(flags,
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v9fs_proto_dotu(v9ses)));
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if (IS_ERR(fid)) {
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err = PTR_ERR(fid);
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fid = NULL;
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goto error;
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}
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/* P9_OEXCL? */
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fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
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if (IS_ERR(fid))
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return PTR_ERR(fid);
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v9fs_invalidate_inode_attr(dir);
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/* if we are opening a file, assign the open fid to the file */
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if (nd) {
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v9inode = V9FS_I(dentry->d_inode);
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mutex_lock(&v9inode->v_mutex);
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if (v9ses->cache && !v9inode->writeback_fid &&
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((flags & O_ACCMODE) != O_RDONLY)) {
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/*
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* clone a fid and add it to writeback_fid
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* we do it during open time instead of
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* page dirty time via write_begin/page_mkwrite
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* because we want write after unlink usecase
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* to work.
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*/
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inode_fid = v9fs_writeback_fid(dentry);
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if (IS_ERR(inode_fid)) {
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err = PTR_ERR(inode_fid);
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mutex_unlock(&v9inode->v_mutex);
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goto error;
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}
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v9inode->writeback_fid = (void *) inode_fid;
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}
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mutex_unlock(&v9inode->v_mutex);
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filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
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if (IS_ERR(filp)) {
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err = PTR_ERR(filp);
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goto error;
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}
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filp->private_data = fid;
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#ifdef CONFIG_9P_FSCACHE
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if (v9ses->cache)
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v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
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#endif
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} else
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p9_client_clunk(fid);
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p9_client_clunk(fid);
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return 0;
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error:
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if (fid)
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p9_client_clunk(fid);
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return err;
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}
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/**
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@ -910,6 +856,93 @@ error:
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return ERR_PTR(result);
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}
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static struct file *
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v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
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struct opendata *od, unsigned flags, umode_t mode,
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bool *created)
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{
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int err;
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u32 perm;
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struct file *filp;
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struct v9fs_inode *v9inode;
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struct v9fs_session_info *v9ses;
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struct p9_fid *fid, *inode_fid;
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struct dentry *res = NULL;
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if (d_unhashed(dentry)) {
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res = v9fs_vfs_lookup(dir, dentry, NULL);
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if (IS_ERR(res))
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return ERR_CAST(res);
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if (res)
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dentry = res;
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}
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/* Only creates */
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if (!(flags & O_CREAT) || dentry->d_inode) {
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finish_no_open(od, res);
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return NULL;
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}
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err = 0;
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fid = NULL;
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v9ses = v9fs_inode2v9ses(dir);
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perm = unixmode2p9mode(v9ses, mode);
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fid = v9fs_create(v9ses, dir, dentry, NULL, perm,
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v9fs_uflags2omode(flags,
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v9fs_proto_dotu(v9ses)));
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if (IS_ERR(fid)) {
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err = PTR_ERR(fid);
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fid = NULL;
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goto error;
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}
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v9fs_invalidate_inode_attr(dir);
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v9inode = V9FS_I(dentry->d_inode);
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mutex_lock(&v9inode->v_mutex);
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if (v9ses->cache && !v9inode->writeback_fid &&
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((flags & O_ACCMODE) != O_RDONLY)) {
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/*
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* clone a fid and add it to writeback_fid
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* we do it during open time instead of
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* page dirty time via write_begin/page_mkwrite
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* because we want write after unlink usecase
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* to work.
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*/
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inode_fid = v9fs_writeback_fid(dentry);
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if (IS_ERR(inode_fid)) {
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err = PTR_ERR(inode_fid);
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mutex_unlock(&v9inode->v_mutex);
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goto error;
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}
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v9inode->writeback_fid = (void *) inode_fid;
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}
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mutex_unlock(&v9inode->v_mutex);
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filp = finish_open(od, dentry, generic_file_open);
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if (IS_ERR(filp)) {
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err = PTR_ERR(filp);
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goto error;
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}
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filp->private_data = fid;
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#ifdef CONFIG_9P_FSCACHE
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if (v9ses->cache)
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v9fs_cache_inode_set_cookie(dentry->d_inode, filp);
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#endif
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*created = true;
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out:
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dput(res);
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return filp;
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error:
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if (fid)
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p9_client_clunk(fid);
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filp = ERR_PTR(err);
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goto out;
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}
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/**
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* v9fs_vfs_unlink - VFS unlink hook to delete an inode
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* @i: inode that is being unlinked
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@ -1488,6 +1521,7 @@ out:
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static const struct inode_operations v9fs_dir_inode_operations_dotu = {
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.create = v9fs_vfs_create,
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.lookup = v9fs_vfs_lookup,
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.atomic_open = v9fs_vfs_atomic_open,
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.symlink = v9fs_vfs_symlink,
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.link = v9fs_vfs_link,
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.unlink = v9fs_vfs_unlink,
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@ -1502,6 +1536,7 @@ static const struct inode_operations v9fs_dir_inode_operations_dotu = {
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static const struct inode_operations v9fs_dir_inode_operations = {
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.create = v9fs_vfs_create,
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.lookup = v9fs_vfs_lookup,
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.atomic_open = v9fs_vfs_atomic_open,
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.unlink = v9fs_vfs_unlink,
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.mkdir = v9fs_vfs_mkdir,
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.rmdir = v9fs_vfs_rmdir,
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@ -230,17 +230,23 @@ int v9fs_open_to_dotl_flags(int flags)
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* @dir: directory inode that is being created
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* @dentry: dentry that is being deleted
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* @mode: create permissions
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* @nd: path information
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*
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*/
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static int
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v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
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struct nameidata *nd)
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{
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return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
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}
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static struct file *
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v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
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struct opendata *od, unsigned flags, umode_t omode,
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bool *created)
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{
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int err = 0;
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gid_t gid;
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int flags;
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umode_t mode;
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char *name = NULL;
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struct file *filp;
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@ -251,18 +257,24 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
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struct p9_fid *dfid, *ofid, *inode_fid;
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struct v9fs_session_info *v9ses;
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struct posix_acl *pacl = NULL, *dacl = NULL;
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struct dentry *res = NULL;
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if (d_unhashed(dentry)) {
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res = v9fs_vfs_lookup(dir, dentry, NULL);
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if (IS_ERR(res))
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return ERR_CAST(res);
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if (res)
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dentry = res;
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}
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/* Only creates */
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if (!(flags & O_CREAT) || dentry->d_inode) {
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finish_no_open(od, res);
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return NULL;
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}
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v9ses = v9fs_inode2v9ses(dir);
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if (nd)
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flags = nd->intent.open.flags;
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else {
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/*
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* create call without LOOKUP_OPEN is due
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* to mknod of regular files. So use mknod
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* operation.
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*/
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return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
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}
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name = (char *) dentry->d_name.name;
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p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
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@ -272,7 +284,7 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
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if (IS_ERR(dfid)) {
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err = PTR_ERR(dfid);
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p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
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return err;
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goto err_return;
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}
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/* clone a fid to use for creation */
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@ -280,7 +292,7 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
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if (IS_ERR(ofid)) {
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err = PTR_ERR(ofid);
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p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
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return err;
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goto err_return;
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}
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gid = v9fs_get_fsgid_for_create(dir);
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@ -345,7 +357,7 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
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}
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mutex_unlock(&v9inode->v_mutex);
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/* Since we are opening a file, assign the open fid to the file */
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filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
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filp = finish_open(od, dentry, generic_file_open);
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if (IS_ERR(filp)) {
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err = PTR_ERR(filp);
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goto err_clunk_old_fid;
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@ -355,7 +367,10 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
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if (v9ses->cache)
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v9fs_cache_inode_set_cookie(inode, filp);
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#endif
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return 0;
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*created = true;
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out:
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dput(res);
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return filp;
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error:
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if (fid)
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@ -364,7 +379,9 @@ err_clunk_old_fid:
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if (ofid)
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p9_client_clunk(ofid);
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v9fs_set_create_acl(NULL, &dacl, &pacl);
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return err;
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err_return:
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filp = ERR_PTR(err);
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goto out;
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}
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/**
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@ -982,6 +999,7 @@ out:
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const struct inode_operations v9fs_dir_inode_operations_dotl = {
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.create = v9fs_vfs_create_dotl,
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.atomic_open = v9fs_vfs_atomic_open_dotl,
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.lookup = v9fs_vfs_lookup,
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.link = v9fs_vfs_link_dotl,
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.symlink = v9fs_vfs_symlink_dotl,
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