forked from Minki/linux
NFS: Reduce the stack usage in NFSv3 create operations
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust
parent
57dc9a5747
commit
0b4aae7aad
@ -248,6 +248,53 @@ static int nfs3_proc_readlink(struct inode *inode, struct page *page,
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return status;
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}
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struct nfs3_createdata {
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struct rpc_message msg;
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union {
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struct nfs3_createargs create;
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struct nfs3_mkdirargs mkdir;
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struct nfs3_symlinkargs symlink;
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struct nfs3_mknodargs mknod;
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} arg;
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struct nfs3_diropres res;
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struct nfs_fh fh;
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struct nfs_fattr fattr;
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struct nfs_fattr dir_attr;
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};
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static struct nfs3_createdata *nfs3_alloc_createdata(void)
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{
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struct nfs3_createdata *data;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (data != NULL) {
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data->msg.rpc_argp = &data->arg;
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data->msg.rpc_resp = &data->res;
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data->res.fh = &data->fh;
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data->res.fattr = &data->fattr;
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data->res.dir_attr = &data->dir_attr;
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nfs_fattr_init(data->res.fattr);
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nfs_fattr_init(data->res.dir_attr);
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}
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return data;
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}
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static int nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data)
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{
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int status;
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status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
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nfs_post_op_update_inode(dir, data->res.dir_attr);
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if (status == 0)
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status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
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return status;
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}
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static void nfs3_free_createdata(struct nfs3_createdata *data)
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{
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kfree(data);
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}
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/*
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* Create a regular file.
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* For now, we don't implement O_EXCL.
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@ -256,70 +303,60 @@ static int
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nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
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int flags, struct nameidata *nd)
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{
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struct nfs_fh fhandle;
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struct nfs_fattr fattr;
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struct nfs_fattr dir_attr;
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struct nfs3_createargs arg = {
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.fh = NFS_FH(dir),
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.name = dentry->d_name.name,
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.len = dentry->d_name.len,
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.sattr = sattr,
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};
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struct nfs3_diropres res = {
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.dir_attr = &dir_attr,
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.fh = &fhandle,
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.fattr = &fattr
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};
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struct rpc_message msg = {
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.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE],
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.rpc_argp = &arg,
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.rpc_resp = &res,
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};
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struct nfs3_createdata *data;
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mode_t mode = sattr->ia_mode;
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int status;
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int status = -ENOMEM;
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dprintk("NFS call create %s\n", dentry->d_name.name);
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arg.createmode = NFS3_CREATE_UNCHECKED;
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data = nfs3_alloc_createdata();
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if (data == NULL)
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goto out;
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data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
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data->arg.create.fh = NFS_FH(dir);
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data->arg.create.name = dentry->d_name.name;
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data->arg.create.len = dentry->d_name.len;
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data->arg.create.sattr = sattr;
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data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
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if (flags & O_EXCL) {
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arg.createmode = NFS3_CREATE_EXCLUSIVE;
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arg.verifier[0] = jiffies;
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arg.verifier[1] = current->pid;
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data->arg.create.createmode = NFS3_CREATE_EXCLUSIVE;
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data->arg.create.verifier[0] = jiffies;
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data->arg.create.verifier[1] = current->pid;
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}
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sattr->ia_mode &= ~current->fs->umask;
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again:
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nfs_fattr_init(&dir_attr);
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nfs_fattr_init(&fattr);
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status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
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nfs_refresh_inode(dir, &dir_attr);
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for (;;) {
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status = nfs3_do_create(dir, dentry, data);
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/* If the server doesn't support the exclusive creation semantics,
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* try again with simple 'guarded' mode. */
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if (status == -ENOTSUPP) {
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switch (arg.createmode) {
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if (status != -ENOTSUPP)
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break;
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/* If the server doesn't support the exclusive creation
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* semantics, try again with simple 'guarded' mode. */
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switch (data->arg.create.createmode) {
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case NFS3_CREATE_EXCLUSIVE:
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arg.createmode = NFS3_CREATE_GUARDED;
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data->arg.create.createmode = NFS3_CREATE_GUARDED;
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break;
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case NFS3_CREATE_GUARDED:
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arg.createmode = NFS3_CREATE_UNCHECKED;
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data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
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break;
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case NFS3_CREATE_UNCHECKED:
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goto out;
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}
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goto again;
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nfs_fattr_init(data->res.dir_attr);
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nfs_fattr_init(data->res.fattr);
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}
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if (status == 0)
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status = nfs_instantiate(dentry, &fhandle, &fattr);
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if (status != 0)
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goto out;
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/* When we created the file with exclusive semantics, make
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* sure we set the attributes afterwards. */
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if (arg.createmode == NFS3_CREATE_EXCLUSIVE) {
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if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
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dprintk("NFS call setattr (post-create)\n");
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if (!(sattr->ia_valid & ATTR_ATIME_SET))
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@ -330,14 +367,15 @@ again:
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/* Note: we could use a guarded setattr here, but I'm
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* not sure this buys us anything (and I'd have
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* to revamp the NFSv3 XDR code) */
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status = nfs3_proc_setattr(dentry, &fattr, sattr);
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nfs_post_op_update_inode(dentry->d_inode, &fattr);
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status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
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nfs_post_op_update_inode(dentry->d_inode, data->res.fattr);
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dprintk("NFS reply setattr (post-create): %d\n", status);
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if (status != 0)
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goto out;
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}
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if (status != 0)
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goto out;
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status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
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out:
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nfs3_free_createdata(data);
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dprintk("NFS reply create: %d\n", status);
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return status;
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}
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@ -452,40 +490,28 @@ static int
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nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
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unsigned int len, struct iattr *sattr)
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{
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struct nfs_fh fhandle;
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struct nfs_fattr fattr, dir_attr;
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struct nfs3_symlinkargs arg = {
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.fromfh = NFS_FH(dir),
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.fromname = dentry->d_name.name,
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.fromlen = dentry->d_name.len,
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.pages = &page,
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.pathlen = len,
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.sattr = sattr
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};
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struct nfs3_diropres res = {
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.dir_attr = &dir_attr,
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.fh = &fhandle,
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.fattr = &fattr
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};
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struct rpc_message msg = {
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.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK],
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.rpc_argp = &arg,
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.rpc_resp = &res,
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};
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int status;
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struct nfs3_createdata *data;
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int status = -ENOMEM;
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if (len > NFS3_MAXPATHLEN)
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return -ENAMETOOLONG;
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dprintk("NFS call symlink %s\n", dentry->d_name.name);
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nfs_fattr_init(&dir_attr);
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nfs_fattr_init(&fattr);
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status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
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nfs_post_op_update_inode(dir, &dir_attr);
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if (status != 0)
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data = nfs3_alloc_createdata();
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if (data == NULL)
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goto out;
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status = nfs_instantiate(dentry, &fhandle, &fattr);
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data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
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data->arg.symlink.fromfh = NFS_FH(dir);
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data->arg.symlink.fromname = dentry->d_name.name;
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data->arg.symlink.fromlen = dentry->d_name.len;
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data->arg.symlink.pages = &page;
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data->arg.symlink.pathlen = len;
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data->arg.symlink.sattr = sattr;
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status = nfs3_do_create(dir, dentry, data);
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nfs3_free_createdata(data);
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out:
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dprintk("NFS reply symlink: %d\n", status);
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return status;
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@ -494,42 +520,31 @@ out:
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static int
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nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
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{
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struct nfs_fh fhandle;
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struct nfs_fattr fattr, dir_attr;
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struct nfs3_mkdirargs arg = {
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.fh = NFS_FH(dir),
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.name = dentry->d_name.name,
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.len = dentry->d_name.len,
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.sattr = sattr
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};
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struct nfs3_diropres res = {
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.dir_attr = &dir_attr,
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.fh = &fhandle,
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.fattr = &fattr
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};
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struct rpc_message msg = {
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.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR],
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.rpc_argp = &arg,
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.rpc_resp = &res,
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};
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struct nfs3_createdata *data;
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int mode = sattr->ia_mode;
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int status;
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int status = -ENOMEM;
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dprintk("NFS call mkdir %s\n", dentry->d_name.name);
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sattr->ia_mode &= ~current->fs->umask;
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nfs_fattr_init(&dir_attr);
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nfs_fattr_init(&fattr);
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status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
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nfs_post_op_update_inode(dir, &dir_attr);
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if (status != 0)
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goto out;
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status = nfs_instantiate(dentry, &fhandle, &fattr);
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data = nfs3_alloc_createdata();
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if (data == NULL)
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goto out;
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data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
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data->arg.mkdir.fh = NFS_FH(dir);
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data->arg.mkdir.name = dentry->d_name.name;
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data->arg.mkdir.len = dentry->d_name.len;
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data->arg.mkdir.sattr = sattr;
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status = nfs3_do_create(dir, dentry, data);
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if (status != 0)
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goto out;
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status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
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out:
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nfs3_free_createdata(data);
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dprintk("NFS reply mkdir: %d\n", status);
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return status;
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}
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@ -615,52 +630,50 @@ static int
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nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
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dev_t rdev)
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{
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struct nfs_fh fh;
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struct nfs_fattr fattr, dir_attr;
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struct nfs3_mknodargs arg = {
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.fh = NFS_FH(dir),
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.name = dentry->d_name.name,
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.len = dentry->d_name.len,
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.sattr = sattr,
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.rdev = rdev
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};
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struct nfs3_diropres res = {
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.dir_attr = &dir_attr,
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.fh = &fh,
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.fattr = &fattr
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};
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struct rpc_message msg = {
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.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD],
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.rpc_argp = &arg,
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.rpc_resp = &res,
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};
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struct nfs3_createdata *data;
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mode_t mode = sattr->ia_mode;
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int status;
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switch (sattr->ia_mode & S_IFMT) {
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case S_IFBLK: arg.type = NF3BLK; break;
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case S_IFCHR: arg.type = NF3CHR; break;
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case S_IFIFO: arg.type = NF3FIFO; break;
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case S_IFSOCK: arg.type = NF3SOCK; break;
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default: return -EINVAL;
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}
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int status = -ENOMEM;
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dprintk("NFS call mknod %s %u:%u\n", dentry->d_name.name,
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MAJOR(rdev), MINOR(rdev));
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sattr->ia_mode &= ~current->fs->umask;
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nfs_fattr_init(&dir_attr);
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nfs_fattr_init(&fattr);
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status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
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nfs_post_op_update_inode(dir, &dir_attr);
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if (status != 0)
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data = nfs3_alloc_createdata();
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if (data == NULL)
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goto out;
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status = nfs_instantiate(dentry, &fh, &fattr);
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data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
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data->arg.mknod.fh = NFS_FH(dir);
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data->arg.mknod.name = dentry->d_name.name;
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data->arg.mknod.len = dentry->d_name.len;
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data->arg.mknod.sattr = sattr;
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data->arg.mknod.rdev = rdev;
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switch (sattr->ia_mode & S_IFMT) {
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case S_IFBLK:
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data->arg.mknod.type = NF3BLK;
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break;
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case S_IFCHR:
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data->arg.mknod.type = NF3CHR;
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break;
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case S_IFIFO:
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data->arg.mknod.type = NF3FIFO;
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break;
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case S_IFSOCK:
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data->arg.mknod.type = NF3SOCK;
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break;
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default:
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status = -EINVAL;
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goto out;
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}
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status = nfs3_do_create(dir, dentry, data);
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if (status != 0)
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goto out;
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status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
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out:
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nfs3_free_createdata(data);
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dprintk("NFS reply mknod: %d\n", status);
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return status;
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}
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