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SUNRPC: Clean up rpc_populate/depopulate 

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2009-08-09 15:14:20 -04:00
parent cfeaa4a3ca
commit ac6fecee31
1 changed files with 103 additions and 88 deletions
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191
net/sunrpc/rpc_pipe.c
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@ -401,7 +401,6 @@ static const struct file_operations rpc_info_operations = {
* We have a single directory with 1 node in it.
*/
enum {
RPCAUTH_Root = 1,
RPCAUTH_lockd,
RPCAUTH_mount,
RPCAUTH_nfs,
@ -415,12 +414,12 @@ enum {
* Description of fs contents.
*/
struct rpc_filelist {
char *name;
const char *name;
const struct file_operations *i_fop;
umode_t mode;
};
static struct rpc_filelist files[] = {
static const struct rpc_filelist files[] = {
[RPCAUTH_lockd] = {
.name = "lockd",
.mode = S_IFDIR | S_IRUGO | S_IXUGO,
@ -448,11 +447,11 @@ static struct rpc_filelist files[] = {
};
enum {
RPCAUTH_info = 2,
RPCAUTH_info,
RPCAUTH_EOF
};
static struct rpc_filelist authfiles[] = {
static const struct rpc_filelist authfiles[] = {
[RPCAUTH_info] = {
.name = "info",
.i_fop = &rpc_info_operations,
@ -564,6 +563,20 @@ static int __rpc_create_common(struct inode *dir, struct dentry *dentry,
return -ENOMEM;
}
static int __rpc_create(struct inode *dir, struct dentry *dentry,
umode_t mode,
const struct file_operations *i_fop,
void *private)
{
int err;
err = __rpc_create_common(dir, dentry, S_IFREG | mode, i_fop, private);
if (err)
return err;
fsnotify_create(dir, dentry);
return 0;
}
static int __rpc_mkdir(struct inode *dir, struct dentry *dentry,
umode_t mode,
const struct file_operations *i_fop,
@ -601,6 +614,17 @@ static int __rpc_mkpipe(struct inode *dir, struct dentry *dentry,
return 0;
}
static int __rpc_rmdir(struct inode *dir, struct dentry *dentry)
{
int ret;
dget(dentry);
ret = simple_rmdir(dir, dentry);
d_delete(dentry);
dput(dentry);
return ret;
}
static int __rpc_unlink(struct inode *dir, struct dentry *dentry)
{
int ret;
@ -678,100 +702,96 @@ static struct dentry *rpc_lookup_negative(const char *path,
/*
* FIXME: This probably has races.
*/
static void rpc_depopulate(struct dentry *parent,
unsigned long start, unsigned long eof)
static void __rpc_depopulate(struct dentry *parent,
const struct rpc_filelist *files,
int start, int eof)
{
struct inode *dir = parent->d_inode;
struct dentry *dentry;
struct qstr name;
int i;
for (i = start; i < eof; i++) {
name.name = files[i].name;
name.len = strlen(files[i].name);
name.hash = full_name_hash(name.name, name.len);
dentry = d_lookup(parent, &name);
if (dentry == NULL)
continue;
if (dentry->d_inode == NULL)
goto next;
switch (dentry->d_inode->i_mode & S_IFMT) {
default:
BUG();
case S_IFREG:
__rpc_unlink(dir, dentry);
break;
case S_IFDIR:
__rpc_rmdir(dir, dentry);
}
next:
dput(dentry);
}
}
static void rpc_depopulate(struct dentry *parent,
const struct rpc_filelist *files,
int start, int eof)
{
struct inode *dir = parent->d_inode;
struct list_head *pos, *next;
struct dentry *dentry, *dvec[10];
int n = 0;
mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD);
repeat:
spin_lock(&dcache_lock);
list_for_each_safe(pos, next, &parent->d_subdirs) {
dentry = list_entry(pos, struct dentry, d_u.d_child);
if (!dentry->d_inode ||
dentry->d_inode->i_ino < start ||
dentry->d_inode->i_ino >= eof)
continue;
spin_lock(&dentry->d_lock);
if (!d_unhashed(dentry)) {
dget_locked(dentry);
__d_drop(dentry);
spin_unlock(&dentry->d_lock);
dvec[n++] = dentry;
if (n == ARRAY_SIZE(dvec))
break;
} else
spin_unlock(&dentry->d_lock);
}
spin_unlock(&dcache_lock);
if (n) {
do {
dentry = dvec[--n];
if (S_ISREG(dentry->d_inode->i_mode))
simple_unlink(dir, dentry);
else if (S_ISDIR(dentry->d_inode->i_mode))
simple_rmdir(dir, dentry);
d_delete(dentry);
dput(dentry);
} while (n);
goto repeat;
}
__rpc_depopulate(parent, files, start, eof);
mutex_unlock(&dir->i_mutex);
}
static int
rpc_populate(struct dentry *parent,
struct rpc_filelist *files,
int start, int eof)
static int rpc_populate(struct dentry *parent,
const struct rpc_filelist *files,
int start, int eof,
void *private)
{
struct inode *inode, *dir = parent->d_inode;
void *private = RPC_I(dir)->private;
struct inode *dir = parent->d_inode;
struct dentry *dentry;
umode_t mode;
int i;
int i, err;
mutex_lock(&dir->i_mutex);
for (i = start; i < eof; i++) {
dentry = d_alloc_name(parent, files[i].name);
if (!dentry)
goto out_bad;
dentry->d_op = &rpc_dentry_operations;
mode = files[i].mode;
inode = rpc_get_inode(dir->i_sb, mode);
if (!inode) {
dput(dentry);
struct qstr q;
q.name = files[i].name;
q.len = strlen(files[i].name);
q.hash = full_name_hash(q.name, q.len);
dentry = __rpc_lookup_create_exclusive(parent, &q);
err = PTR_ERR(dentry);
if (IS_ERR(dentry))
goto out_bad;
switch (files[i].mode & S_IFMT) {
default:
BUG();
case S_IFREG:
err = __rpc_create(dir, dentry,
files[i].mode,
files[i].i_fop,
private);
break;
case S_IFDIR:
err = __rpc_mkdir(dir, dentry,
files[i].mode,
NULL,
private);
}
inode->i_ino = i;
if (files[i].i_fop)
inode->i_fop = files[i].i_fop;
if (private)
rpc_inode_setowner(inode, private);
if (S_ISDIR(mode))
inc_nlink(dir);
d_add(dentry, inode);
fsnotify_create(dir, dentry);
if (err != 0)
goto out_bad;
}
mutex_unlock(&dir->i_mutex);
return 0;
out_bad:
__rpc_depopulate(parent, files, start, eof);
mutex_unlock(&dir->i_mutex);
printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
__FILE__, __func__, parent->d_name.name);
return -ENOMEM;
}
static int
__rpc_rmdir(struct inode *dir, struct dentry *dentry)
{
int error;
error = simple_rmdir(dir, dentry);
if (!error)
d_delete(dentry);
return error;
return err;
}
/**
@ -800,16 +820,14 @@ rpc_mkdir(char *path, struct rpc_clnt *rpc_client)
if (error != 0)
goto out_err;
error = rpc_populate(dentry, authfiles,
RPCAUTH_info, RPCAUTH_EOF);
RPCAUTH_info, RPCAUTH_EOF, rpc_client);
if (error)
goto err_depopulate;
dget(dentry);
goto err_rmdir;
out:
mutex_unlock(&dir->i_mutex);
rpc_release_path(&nd);
return dentry;
err_depopulate:
rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF);
err_rmdir:
__rpc_rmdir(dir, dentry);
out_err:
printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n",
@ -832,9 +850,8 @@ rpc_rmdir(struct dentry *dentry)
parent = dget_parent(dentry);
dir = parent->d_inode;
mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
rpc_depopulate(dentry, RPCAUTH_info, RPCAUTH_EOF);
rpc_depopulate(dentry, authfiles, RPCAUTH_info, RPCAUTH_EOF);
error = __rpc_rmdir(dir, dentry);
dput(dentry);
mutex_unlock(&dir->i_mutex);
dput(parent);
return error;
@ -900,7 +917,6 @@ struct dentry *rpc_mkpipe(struct dentry *parent, const char *name,
private, ops, flags);
if (err)
goto out_err;
dget(dentry);
out:
mutex_unlock(&dir->i_mutex);
return dentry;
@ -932,7 +948,6 @@ rpc_unlink(struct dentry *dentry)
dir = parent->d_inode;
mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
error = __rpc_rmpipe(dir, dentry);
dput(dentry);
mutex_unlock(&dir->i_mutex);
dput(parent);
return error;
@ -970,7 +985,7 @@ rpc_fill_super(struct super_block *sb, void *data, int silent)
iput(inode);
return -ENOMEM;
}
if (rpc_populate(root, files, RPCAUTH_Root + 1, RPCAUTH_RootEOF))
if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
goto out;
sb->s_root = root;
return 0;