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NFS: Reduce the stack usage in NFSv3 create operations
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Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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Trond Myklebust authored and Trond Myklebust committed Jul 9, 2008
1 parent 57dc9a5 commit 0b4aae7
Showing 1 changed file with 142 additions and 129 deletions.
271 changes: 142 additions & 129 deletions fs/nfs/nfs3proc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -248,6 +248,53 @@ static int nfs3_proc_readlink(struct inode *inode, struct page *page,
return status;
}

struct nfs3_createdata {
struct rpc_message msg;
union {
struct nfs3_createargs create;
struct nfs3_mkdirargs mkdir;
struct nfs3_symlinkargs symlink;
struct nfs3_mknodargs mknod;
} arg;
struct nfs3_diropres res;
struct nfs_fh fh;
struct nfs_fattr fattr;
struct nfs_fattr dir_attr;
};

static struct nfs3_createdata *nfs3_alloc_createdata(void)
{
struct nfs3_createdata *data;

data = kzalloc(sizeof(*data), GFP_KERNEL);
if (data != NULL) {
data->msg.rpc_argp = &data->arg;
data->msg.rpc_resp = &data->res;
data->res.fh = &data->fh;
data->res.fattr = &data->fattr;
data->res.dir_attr = &data->dir_attr;
nfs_fattr_init(data->res.fattr);
nfs_fattr_init(data->res.dir_attr);
}
return data;
}

static int nfs3_do_create(struct inode *dir, struct dentry *dentry, struct nfs3_createdata *data)
{
int status;

status = rpc_call_sync(NFS_CLIENT(dir), &data->msg, 0);
nfs_post_op_update_inode(dir, data->res.dir_attr);
if (status == 0)
status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
return status;
}

static void nfs3_free_createdata(struct nfs3_createdata *data)
{
kfree(data);
}

/*
* Create a regular file.
* For now, we don't implement O_EXCL.
Expand All @@ -256,70 +303,60 @@ static int
nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
int flags, struct nameidata *nd)
{
struct nfs_fh fhandle;
struct nfs_fattr fattr;
struct nfs_fattr dir_attr;
struct nfs3_createargs arg = {
.fh = NFS_FH(dir),
.name = dentry->d_name.name,
.len = dentry->d_name.len,
.sattr = sattr,
};
struct nfs3_diropres res = {
.dir_attr = &dir_attr,
.fh = &fhandle,
.fattr = &fattr
};
struct rpc_message msg = {
.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE],
.rpc_argp = &arg,
.rpc_resp = &res,
};
struct nfs3_createdata *data;
mode_t mode = sattr->ia_mode;
int status;
int status = -ENOMEM;

dprintk("NFS call create %s\n", dentry->d_name.name);
arg.createmode = NFS3_CREATE_UNCHECKED;

data = nfs3_alloc_createdata();
if (data == NULL)
goto out;

data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_CREATE];
data->arg.create.fh = NFS_FH(dir);
data->arg.create.name = dentry->d_name.name;
data->arg.create.len = dentry->d_name.len;
data->arg.create.sattr = sattr;

data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
if (flags & O_EXCL) {
arg.createmode = NFS3_CREATE_EXCLUSIVE;
arg.verifier[0] = jiffies;
arg.verifier[1] = current->pid;
data->arg.create.createmode = NFS3_CREATE_EXCLUSIVE;
data->arg.create.verifier[0] = jiffies;
data->arg.create.verifier[1] = current->pid;
}

sattr->ia_mode &= ~current->fs->umask;

again:
nfs_fattr_init(&dir_attr);
nfs_fattr_init(&fattr);
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
nfs_refresh_inode(dir, &dir_attr);
for (;;) {
status = nfs3_do_create(dir, dentry, data);

/* If the server doesn't support the exclusive creation semantics,
* try again with simple 'guarded' mode. */
if (status == -ENOTSUPP) {
switch (arg.createmode) {
if (status != -ENOTSUPP)
break;
/* If the server doesn't support the exclusive creation
* semantics, try again with simple 'guarded' mode. */
switch (data->arg.create.createmode) {
case NFS3_CREATE_EXCLUSIVE:
arg.createmode = NFS3_CREATE_GUARDED;
data->arg.create.createmode = NFS3_CREATE_GUARDED;
break;

case NFS3_CREATE_GUARDED:
arg.createmode = NFS3_CREATE_UNCHECKED;
data->arg.create.createmode = NFS3_CREATE_UNCHECKED;
break;

case NFS3_CREATE_UNCHECKED:
goto out;
}
goto again;
nfs_fattr_init(data->res.dir_attr);
nfs_fattr_init(data->res.fattr);
}

if (status == 0)
status = nfs_instantiate(dentry, &fhandle, &fattr);
if (status != 0)
goto out;

/* When we created the file with exclusive semantics, make
* sure we set the attributes afterwards. */
if (arg.createmode == NFS3_CREATE_EXCLUSIVE) {
if (data->arg.create.createmode == NFS3_CREATE_EXCLUSIVE) {
dprintk("NFS call setattr (post-create)\n");

if (!(sattr->ia_valid & ATTR_ATIME_SET))
Expand All @@ -330,14 +367,15 @@ nfs3_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
/* Note: we could use a guarded setattr here, but I'm
* not sure this buys us anything (and I'd have
* to revamp the NFSv3 XDR code) */
status = nfs3_proc_setattr(dentry, &fattr, sattr);
nfs_post_op_update_inode(dentry->d_inode, &fattr);
status = nfs3_proc_setattr(dentry, data->res.fattr, sattr);
nfs_post_op_update_inode(dentry->d_inode, data->res.fattr);
dprintk("NFS reply setattr (post-create): %d\n", status);
if (status != 0)
goto out;
}
if (status != 0)
goto out;
status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
out:
nfs3_free_createdata(data);
dprintk("NFS reply create: %d\n", status);
return status;
}
Expand Down Expand Up @@ -452,40 +490,28 @@ static int
nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
unsigned int len, struct iattr *sattr)
{
struct nfs_fh fhandle;
struct nfs_fattr fattr, dir_attr;
struct nfs3_symlinkargs arg = {
.fromfh = NFS_FH(dir),
.fromname = dentry->d_name.name,
.fromlen = dentry->d_name.len,
.pages = &page,
.pathlen = len,
.sattr = sattr
};
struct nfs3_diropres res = {
.dir_attr = &dir_attr,
.fh = &fhandle,
.fattr = &fattr
};
struct rpc_message msg = {
.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK],
.rpc_argp = &arg,
.rpc_resp = &res,
};
int status;
struct nfs3_createdata *data;
int status = -ENOMEM;

if (len > NFS3_MAXPATHLEN)
return -ENAMETOOLONG;

dprintk("NFS call symlink %s\n", dentry->d_name.name);

nfs_fattr_init(&dir_attr);
nfs_fattr_init(&fattr);
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
nfs_post_op_update_inode(dir, &dir_attr);
if (status != 0)
data = nfs3_alloc_createdata();
if (data == NULL)
goto out;
status = nfs_instantiate(dentry, &fhandle, &fattr);
data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_SYMLINK];
data->arg.symlink.fromfh = NFS_FH(dir);
data->arg.symlink.fromname = dentry->d_name.name;
data->arg.symlink.fromlen = dentry->d_name.len;
data->arg.symlink.pages = &page;
data->arg.symlink.pathlen = len;
data->arg.symlink.sattr = sattr;

status = nfs3_do_create(dir, dentry, data);

nfs3_free_createdata(data);
out:
dprintk("NFS reply symlink: %d\n", status);
return status;
Expand All @@ -494,42 +520,31 @@ nfs3_proc_symlink(struct inode *dir, struct dentry *dentry, struct page *page,
static int
nfs3_proc_mkdir(struct inode *dir, struct dentry *dentry, struct iattr *sattr)
{
struct nfs_fh fhandle;
struct nfs_fattr fattr, dir_attr;
struct nfs3_mkdirargs arg = {
.fh = NFS_FH(dir),
.name = dentry->d_name.name,
.len = dentry->d_name.len,
.sattr = sattr
};
struct nfs3_diropres res = {
.dir_attr = &dir_attr,
.fh = &fhandle,
.fattr = &fattr
};
struct rpc_message msg = {
.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR],
.rpc_argp = &arg,
.rpc_resp = &res,
};
struct nfs3_createdata *data;
int mode = sattr->ia_mode;
int status;
int status = -ENOMEM;

dprintk("NFS call mkdir %s\n", dentry->d_name.name);

sattr->ia_mode &= ~current->fs->umask;

nfs_fattr_init(&dir_attr);
nfs_fattr_init(&fattr);
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
nfs_post_op_update_inode(dir, &dir_attr);
if (status != 0)
data = nfs3_alloc_createdata();
if (data == NULL)
goto out;
status = nfs_instantiate(dentry, &fhandle, &fattr);

data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKDIR];
data->arg.mkdir.fh = NFS_FH(dir);
data->arg.mkdir.name = dentry->d_name.name;
data->arg.mkdir.len = dentry->d_name.len;
data->arg.mkdir.sattr = sattr;

status = nfs3_do_create(dir, dentry, data);
if (status != 0)
goto out;

status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
out:
nfs3_free_createdata(data);
dprintk("NFS reply mkdir: %d\n", status);
return status;
}
Expand Down Expand Up @@ -615,52 +630,50 @@ static int
nfs3_proc_mknod(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
dev_t rdev)
{
struct nfs_fh fh;
struct nfs_fattr fattr, dir_attr;
struct nfs3_mknodargs arg = {
.fh = NFS_FH(dir),
.name = dentry->d_name.name,
.len = dentry->d_name.len,
.sattr = sattr,
.rdev = rdev
};
struct nfs3_diropres res = {
.dir_attr = &dir_attr,
.fh = &fh,
.fattr = &fattr
};
struct rpc_message msg = {
.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD],
.rpc_argp = &arg,
.rpc_resp = &res,
};
struct nfs3_createdata *data;
mode_t mode = sattr->ia_mode;
int status;

switch (sattr->ia_mode & S_IFMT) {
case S_IFBLK: arg.type = NF3BLK; break;
case S_IFCHR: arg.type = NF3CHR; break;
case S_IFIFO: arg.type = NF3FIFO; break;
case S_IFSOCK: arg.type = NF3SOCK; break;
default: return -EINVAL;
}
int status = -ENOMEM;

dprintk("NFS call mknod %s %u:%u\n", dentry->d_name.name,
MAJOR(rdev), MINOR(rdev));

sattr->ia_mode &= ~current->fs->umask;

nfs_fattr_init(&dir_attr);
nfs_fattr_init(&fattr);
status = rpc_call_sync(NFS_CLIENT(dir), &msg, 0);
nfs_post_op_update_inode(dir, &dir_attr);
if (status != 0)
data = nfs3_alloc_createdata();
if (data == NULL)
goto out;
status = nfs_instantiate(dentry, &fh, &fattr);

data->msg.rpc_proc = &nfs3_procedures[NFS3PROC_MKNOD];
data->arg.mknod.fh = NFS_FH(dir);
data->arg.mknod.name = dentry->d_name.name;
data->arg.mknod.len = dentry->d_name.len;
data->arg.mknod.sattr = sattr;
data->arg.mknod.rdev = rdev;

switch (sattr->ia_mode & S_IFMT) {
case S_IFBLK:
data->arg.mknod.type = NF3BLK;
break;
case S_IFCHR:
data->arg.mknod.type = NF3CHR;
break;
case S_IFIFO:
data->arg.mknod.type = NF3FIFO;
break;
case S_IFSOCK:
data->arg.mknod.type = NF3SOCK;
break;
default:
status = -EINVAL;
goto out;
}

status = nfs3_do_create(dir, dentry, data);
if (status != 0)
goto out;
status = nfs3_proc_set_default_acl(dir, dentry->d_inode, mode);
out:
nfs3_free_createdata(data);
dprintk("NFS reply mknod: %d\n", status);
return status;
}
Expand Down

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