static struct vfsmount * relayfs_mount;
static int relayfs_mount_count;
-static kmem_cache_t * relayfs_inode_cachep;
static struct backing_dev_info relayfs_backing_dev_info = {
.ra_pages = 0, /* No readahead */
.capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
};
-static struct inode *relayfs_get_inode(struct super_block *sb, int mode,
- struct rchan *chan)
+static struct inode *relayfs_get_inode(struct super_block *sb,
+ int mode,
+ struct file_operations *fops,
+ void *data)
{
- struct rchan_buf *buf = NULL;
struct inode *inode;
- if (S_ISREG(mode)) {
- BUG_ON(!chan);
- buf = relay_create_buf(chan);
- if (!buf)
- return NULL;
- }
-
inode = new_inode(sb);
- if (!inode) {
- relay_destroy_buf(buf);
+ if (!inode)
return NULL;
- }
inode->i_mode = mode;
inode->i_uid = 0;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
switch (mode & S_IFMT) {
case S_IFREG:
- inode->i_fop = &relayfs_file_operations;
- RELAYFS_I(inode)->buf = buf;
+ inode->i_fop = fops;
+ if (data)
+ inode->u.generic_ip = data;
break;
case S_IFDIR:
inode->i_op = &simple_dir_inode_operations;
* @name: the name of the file to create
* @parent: parent directory
* @mode: mode
- * @chan: relay channel associated with the file
+ * @fops: file operations to use for the file
+ * @data: user-associated data for this file
*
* Returns the new dentry, NULL on failure
*
static struct dentry *relayfs_create_entry(const char *name,
struct dentry *parent,
int mode,
- struct rchan *chan)
+ struct file_operations *fops,
+ void *data)
{
struct dentry *d;
struct inode *inode;
}
parent = dget(parent);
- down(&parent->d_inode->i_sem);
+ mutex_lock(&parent->d_inode->i_mutex);
d = lookup_one_len(name, parent, strlen(name));
if (IS_ERR(d)) {
d = NULL;
goto release_mount;
}
- inode = relayfs_get_inode(parent->d_inode->i_sb, mode, chan);
+ inode = relayfs_get_inode(parent->d_inode->i_sb, mode, fops, data);
if (!inode) {
d = NULL;
goto release_mount;
simple_release_fs(&relayfs_mount, &relayfs_mount_count);
exit:
- up(&parent->d_inode->i_sem);
+ mutex_unlock(&parent->d_inode->i_mutex);
dput(parent);
return d;
}
* @name: the name of the file to create
* @parent: parent directory
* @mode: mode, if not specied the default perms are used
- * @chan: channel associated with the file
+ * @fops: file operations to use for the file
+ * @data: user-associated data for this file
*
* Returns file dentry if successful, NULL otherwise.
*
* The file will be created user r on behalf of current user.
*/
-struct dentry *relayfs_create_file(const char *name, struct dentry *parent,
- int mode, struct rchan *chan)
+struct dentry *relayfs_create_file(const char *name,
+ struct dentry *parent,
+ int mode,
+ struct file_operations *fops,
+ void *data)
{
+ BUG_ON(!fops);
+
if (!mode)
mode = S_IRUSR;
mode = (mode & S_IALLUGO) | S_IFREG;
- return relayfs_create_entry(name, parent, mode, chan);
+ return relayfs_create_entry(name, parent, mode, fops, data);
}
/**
struct dentry *relayfs_create_dir(const char *name, struct dentry *parent)
{
int mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
- return relayfs_create_entry(name, parent, mode, NULL);
+ return relayfs_create_entry(name, parent, mode, NULL, NULL);
}
/**
return -EINVAL;
parent = dget(parent);
- down(&parent->d_inode->i_sem);
+ mutex_lock(&parent->d_inode->i_mutex);
if (dentry->d_inode) {
if (S_ISDIR(dentry->d_inode->i_mode))
error = simple_rmdir(parent->d_inode, dentry);
}
if (!error)
dput(dentry);
- up(&parent->d_inode->i_sem);
+ mutex_unlock(&parent->d_inode->i_mutex);
dput(parent);
if (!error)
}
/**
+ * relayfs_remove_file - remove a file from relay filesystem
+ * @dentry: directory dentry
+ *
+ * Returns 0 if successful, negative otherwise.
+ */
+int relayfs_remove_file(struct dentry *dentry)
+{
+ return relayfs_remove(dentry);
+}
+
+/**
* relayfs_remove_dir - remove a directory in the relay filesystem
* @dentry: directory dentry
*
}
/**
- * relayfs_open - open file op for relayfs files
+ * relay_file_open - open file op for relay files
* @inode: the inode
* @filp: the file
*
* Increments the channel buffer refcount.
*/
-static int relayfs_open(struct inode *inode, struct file *filp)
+static int relay_file_open(struct inode *inode, struct file *filp)
{
- struct rchan_buf *buf = RELAYFS_I(inode)->buf;
+ struct rchan_buf *buf = inode->u.generic_ip;
kref_get(&buf->kref);
+ filp->private_data = buf;
return 0;
}
/**
- * relayfs_mmap - mmap file op for relayfs files
+ * relay_file_mmap - mmap file op for relay files
* @filp: the file
* @vma: the vma describing what to map
*
* Calls upon relay_mmap_buf to map the file into user space.
*/
-static int relayfs_mmap(struct file *filp, struct vm_area_struct *vma)
+static int relay_file_mmap(struct file *filp, struct vm_area_struct *vma)
{
- struct inode *inode = filp->f_dentry->d_inode;
- return relay_mmap_buf(RELAYFS_I(inode)->buf, vma);
+ struct rchan_buf *buf = filp->private_data;
+ return relay_mmap_buf(buf, vma);
}
/**
- * relayfs_poll - poll file op for relayfs files
+ * relay_file_poll - poll file op for relay files
* @filp: the file
* @wait: poll table
*
* Poll implemention.
*/
-static unsigned int relayfs_poll(struct file *filp, poll_table *wait)
+static unsigned int relay_file_poll(struct file *filp, poll_table *wait)
{
unsigned int mask = 0;
- struct inode *inode = filp->f_dentry->d_inode;
- struct rchan_buf *buf = RELAYFS_I(inode)->buf;
+ struct rchan_buf *buf = filp->private_data;
if (buf->finalized)
return POLLERR;
}
/**
- * relayfs_release - release file op for relayfs files
+ * relay_file_release - release file op for relay files
* @inode: the inode
* @filp: the file
*
* Decrements the channel refcount, as the filesystem is
* no longer using it.
*/
-static int relayfs_release(struct inode *inode, struct file *filp)
+static int relay_file_release(struct inode *inode, struct file *filp)
{
- struct rchan_buf *buf = RELAYFS_I(inode)->buf;
+ struct rchan_buf *buf = filp->private_data;
kref_put(&buf->kref, relay_remove_buf);
return 0;
}
/**
- * relayfs_read_consume - update the consumed count for the buffer
+ * relay_file_read_consume - update the consumed count for the buffer
*/
-static void relayfs_read_consume(struct rchan_buf *buf,
- size_t read_pos,
- size_t bytes_consumed)
+static void relay_file_read_consume(struct rchan_buf *buf,
+ size_t read_pos,
+ size_t bytes_consumed)
{
size_t subbuf_size = buf->chan->subbuf_size;
size_t n_subbufs = buf->chan->n_subbufs;
}
/**
- * relayfs_read_avail - boolean, are there unconsumed bytes available?
+ * relay_file_read_avail - boolean, are there unconsumed bytes available?
*/
-static int relayfs_read_avail(struct rchan_buf *buf, size_t read_pos)
+static int relay_file_read_avail(struct rchan_buf *buf, size_t read_pos)
{
size_t bytes_produced, bytes_consumed, write_offset;
size_t subbuf_size = buf->chan->subbuf_size;
if (bytes_produced == bytes_consumed)
return 0;
- relayfs_read_consume(buf, read_pos, 0);
+ relay_file_read_consume(buf, read_pos, 0);
return 1;
}
/**
- * relayfs_read_subbuf_avail - return bytes available in sub-buffer
+ * relay_file_read_subbuf_avail - return bytes available in sub-buffer
*/
-static size_t relayfs_read_subbuf_avail(size_t read_pos,
- struct rchan_buf *buf)
+static size_t relay_file_read_subbuf_avail(size_t read_pos,
+ struct rchan_buf *buf)
{
size_t padding, avail = 0;
size_t read_subbuf, read_offset, write_subbuf, write_offset;
}
/**
- * relayfs_read_start_pos - find the first available byte to read
+ * relay_file_read_start_pos - find the first available byte to read
*
* If the read_pos is in the middle of padding, return the
* position of the first actually available byte, otherwise
* return the original value.
*/
-static size_t relayfs_read_start_pos(size_t read_pos,
- struct rchan_buf *buf)
+static size_t relay_file_read_start_pos(size_t read_pos,
+ struct rchan_buf *buf)
{
size_t read_subbuf, padding, padding_start, padding_end;
size_t subbuf_size = buf->chan->subbuf_size;
}
/**
- * relayfs_read_end_pos - return the new read position
+ * relay_file_read_end_pos - return the new read position
*/
-static size_t relayfs_read_end_pos(struct rchan_buf *buf,
- size_t read_pos,
- size_t count)
+static size_t relay_file_read_end_pos(struct rchan_buf *buf,
+ size_t read_pos,
+ size_t count)
{
size_t read_subbuf, padding, end_pos;
size_t subbuf_size = buf->chan->subbuf_size;
}
/**
- * relayfs_read - read file op for relayfs files
+ * relay_file_read - read file op for relay files
* @filp: the file
* @buffer: the userspace buffer
* @count: number of bytes to read
* Reads count bytes or the number of bytes available in the
* current sub-buffer being read, whichever is smaller.
*/
-static ssize_t relayfs_read(struct file *filp,
- char __user *buffer,
- size_t count,
- loff_t *ppos)
+static ssize_t relay_file_read(struct file *filp,
+ char __user *buffer,
+ size_t count,
+ loff_t *ppos)
{
+ struct rchan_buf *buf = filp->private_data;
struct inode *inode = filp->f_dentry->d_inode;
- struct rchan_buf *buf = RELAYFS_I(inode)->buf;
size_t read_start, avail;
ssize_t ret = 0;
void *from;
- down(&inode->i_sem);
- if(!relayfs_read_avail(buf, *ppos))
+ mutex_lock(&inode->i_mutex);
+ if(!relay_file_read_avail(buf, *ppos))
goto out;
- read_start = relayfs_read_start_pos(*ppos, buf);
- avail = relayfs_read_subbuf_avail(read_start, buf);
+ read_start = relay_file_read_start_pos(*ppos, buf);
+ avail = relay_file_read_subbuf_avail(read_start, buf);
if (!avail)
goto out;
ret = -EFAULT;
goto out;
}
- relayfs_read_consume(buf, read_start, count);
- *ppos = relayfs_read_end_pos(buf, read_start, count);
+ relay_file_read_consume(buf, read_start, count);
+ *ppos = relay_file_read_end_pos(buf, read_start, count);
out:
- up(&inode->i_sem);
+ mutex_unlock(&inode->i_mutex);
return ret;
}
-/**
- * relayfs alloc_inode() implementation
- */
-static struct inode *relayfs_alloc_inode(struct super_block *sb)
-{
- struct relayfs_inode_info *p = kmem_cache_alloc(relayfs_inode_cachep, SLAB_KERNEL);
- if (!p)
- return NULL;
- p->buf = NULL;
-
- return &p->vfs_inode;
-}
-
-/**
- * relayfs destroy_inode() implementation
- */
-static void relayfs_destroy_inode(struct inode *inode)
-{
- if (RELAYFS_I(inode)->buf)
- relay_destroy_buf(RELAYFS_I(inode)->buf);
-
- kmem_cache_free(relayfs_inode_cachep, RELAYFS_I(inode));
-}
-
-static void init_once(void *p, kmem_cache_t *cachep, unsigned long flags)
-{
- struct relayfs_inode_info *i = p;
- if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) == SLAB_CTOR_CONSTRUCTOR)
- inode_init_once(&i->vfs_inode);
-}
-
-struct file_operations relayfs_file_operations = {
- .open = relayfs_open,
- .poll = relayfs_poll,
- .mmap = relayfs_mmap,
- .read = relayfs_read,
+struct file_operations relay_file_operations = {
+ .open = relay_file_open,
+ .poll = relay_file_poll,
+ .mmap = relay_file_mmap,
+ .read = relay_file_read,
.llseek = no_llseek,
- .release = relayfs_release,
+ .release = relay_file_release,
};
static struct super_operations relayfs_ops = {
.statfs = simple_statfs,
.drop_inode = generic_delete_inode,
- .alloc_inode = relayfs_alloc_inode,
- .destroy_inode = relayfs_destroy_inode,
};
static int relayfs_fill_super(struct super_block * sb, void * data, int silent)
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
sb->s_magic = RELAYFS_MAGIC;
sb->s_op = &relayfs_ops;
- inode = relayfs_get_inode(sb, mode, NULL);
+ inode = relayfs_get_inode(sb, mode, NULL, NULL);
if (!inode)
return -ENOMEM;
static int __init init_relayfs_fs(void)
{
- int err;
-
- relayfs_inode_cachep = kmem_cache_create("relayfs_inode_cache",
- sizeof(struct relayfs_inode_info), 0,
- 0, init_once, NULL);
- if (!relayfs_inode_cachep)
- return -ENOMEM;
-
- err = register_filesystem(&relayfs_fs_type);
- if (err)
- kmem_cache_destroy(relayfs_inode_cachep);
-
- return err;
+ return register_filesystem(&relayfs_fs_type);
}
static void __exit exit_relayfs_fs(void)
{
+
+
+
+
+
unregister_filesystem(&relayfs_fs_type);
- kmem_cache_destroy(relayfs_inode_cachep);
}
module_init(init_relayfs_fs)
module_exit(exit_relayfs_fs)
-EXPORT_SYMBOL_GPL(relayfs_file_operations);
+EXPORT_SYMBOL_GPL(relay_file_operations);
EXPORT_SYMBOL_GPL(relayfs_create_dir);
EXPORT_SYMBOL_GPL(relayfs_remove_dir);
+EXPORT_SYMBOL_GPL(relayfs_create_file);
+EXPORT_SYMBOL_GPL(relayfs_remove_file);
MODULE_AUTHOR("Tom Zanussi <zanussi@us.ibm.com> and Karim Yaghmour <karim@opersys.com>");
MODULE_DESCRIPTION("Relay Filesystem");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff