initial commit of the fpgafs
git-svn-id: svn+ssh://en.codiert.org/home/staff/ben/dev/misc.svn/projects/fpgafs@338 766a2236-cff9-0310-b0c0-a81a5f92509a
This commit is contained in:
ben
commit
9e05e670b4
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#
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# Makefile for the fpgafs virtual filesystem
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#
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obj-$(CONFIG_FPGA_FS) += fpgafs.o
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fpgafs-objs := inode.o files.o
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include "fpgafs.h"
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/* generic open function for all pipe-like files */
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static int fpgafs_pipe_open(struct inode *inode, struct file *file)
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{
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struct fpgafs_inode_info *i = FPGAFS_I(inode);
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file->private_data = i->i_ctx;
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return nonseekable_open(inode, file);
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}
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static ssize_t fpgafs_stat_read(struct file *file, char __user *buf,
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size_t len, loff_t *pos)
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{
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struct fpga_context *ctx = file->private_data;
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u32 data, __user *udata;
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ssize_t count;
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if (len < 4)
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return -EINVAL;
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if (!access_ok(VERIFY_WRITE, buf, len))
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return -EFAULT;
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udata = (void __user *)buf;
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for (count = 0; (count + 4) <= len; count += 4, udata++) {
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int ret;
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/* operation to read the status ... */
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data=0x42;
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ret = 0;
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if (ret == 0)
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break;
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ret = __put_user(data, udata);
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if (ret) {
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if (!count)
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count = -EFAULT;
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break;
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}
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}
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if (!count)
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count = -EAGAIN;
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return count;
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}
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static const struct file_operations fpgafs_stat_fops = {
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.open = fpgafs_pipe_open,
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.read = fpgafs_stat_read,
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};
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struct tree_descr fpgafs_dir_contents[] = {
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#if 0
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{ "cmd", &fpgafs_cmd_fops, 0222, },
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{ "din", &spufs_mbox_fops, 0222, },
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{ "dout", &spufs_ibox_fops, 0444, },
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{ "load", &spufs_wbox_fops, 0666, },
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#endif
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{ "stat", &fpgafs_stat_fops, 0444, },
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{},
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};
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@ -0,0 +1,29 @@
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#ifndef FPGAFS_H
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#define FPGAFS_H
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#include <linux/kref.h>
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/fs.h>
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/* magic number the file system */
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enum {
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FPGAFS_MAGIC = 0x4255AA42,
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};
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struct fpga_context {
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int bla1;
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int bla2;
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};
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struct fpgafs_inode_info {
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struct fpga_context *i_ctx;
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struct inode vfs_inode;
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};
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extern struct tree_descr fpgafs_dir_contents[];
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#define FPGAFS_I(inode) \
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container_of(inode, struct fpgafs_inode_info, vfs_inode)
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#endif /* FPGAFS_H */
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@ -0,0 +1,307 @@
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include "fpgafs.h"
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static struct inode *fpgafs_alloc_inode(struct super_block *sb);
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static void fpgafs_destroy_inode(struct inode *inode);
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static void fpgafs_delete_inode(struct inode *inode);
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static struct inode *fpgafs_new_inode(struct super_block *sb, int mode);
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static void fpgafs_prune_dir(struct dentry *dir);
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int fpgafs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
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static int fpgafs_rmdir(struct inode *dir, struct dentry *dentry);
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static int fpgafs_new_file(struct super_block *sb, struct dentry *dentry,
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const struct file_operations *fops, int mode,
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struct fpga_context *ctx);
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static int fpgafs_setattr(struct dentry *dentry, struct iattr *attr);
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const struct file_operations fpgafs_context_foperations = {
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.open = dcache_dir_open,
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//.release = fpgafs_dir_close,
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.llseek = dcache_dir_lseek,
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.read = generic_read_dir,
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.readdir = dcache_readdir,
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.fsync = simple_sync_file,
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};
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const struct inode_operations fpgafs_simple_dir_inode_operations = {
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.lookup = simple_lookup,
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};
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const struct inode_operations fpgafs_dir_inode_operations = {
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.lookup = simple_lookup,
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.mkdir = fpgafs_mkdir,
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.rmdir = fpgafs_rmdir,
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};
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static struct kmem_cache *fpgafs_inode_cache;
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/* basic inode operations */
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static struct inode *fpgafs_alloc_inode(struct super_block *sb)
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{
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struct fpgafs_inode_info *fsi;
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fsi = kmem_cache_alloc(fpgafs_inode_cache, GFP_KERNEL);
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if (!fsi)
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return NULL;
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fsi->i_ctx = NULL;
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return &fsi->vfs_inode;
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}
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static void fpgafs_destroy_inode(struct inode *inode)
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{
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kmem_cache_free(fpgafs_inode_cache, FPGAFS_I(inode));
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}
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static void fpgafs_delete_inode(struct inode *inode)
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{
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//struct fpgafs_inode_info *fsi = FPGAFS_I(inode);
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// XXX: do some fpga interface operations....
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// if (fsi->i_ctx)
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// put_fpga_context(ei->i_ctx);
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clear_inode(inode);
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}
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static struct inode *fpgafs_new_inode(struct super_block *sb, int mode)
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{
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struct inode *inode;
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inode = new_inode(sb);
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if (!inode)
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return inode;
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inode->i_mode = mode;
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inode->i_uid = current->fsuid;
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inode->i_gid = current->fsgid;
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inode->i_blocks = 0;
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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return inode;
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}
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/* FPGA FS specific functions */
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static int fpgafs_fill_dir(struct dentry *dir, struct tree_descr *files,
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int mode, struct fpga_context *ctx)
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{
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struct dentry *dentry;
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int ret;
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while (files->name && files->name[0]) {
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ret = -ENOMEM;
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dentry = d_alloc_name(dir, files->name);
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if (!dentry)
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goto out;
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ret = fpgafs_new_file(dir->d_sb, dentry, files->ops,
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files->mode & mode, ctx);
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if (ret)
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goto out;
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files++;
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}
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return 0;
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out:
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fpgafs_prune_dir(dir);
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return ret;
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}
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/* specific operations */
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static int fpgafs_setattr(struct dentry *dentry, struct iattr *attr)
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{
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struct inode *inode = dentry->d_inode;
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if ((attr->ia_valid & ATTR_SIZE) &&
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(attr->ia_size != inode->i_size))
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return -EINVAL;
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return inode_setattr(inode, attr);
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}
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static int fpgafs_new_file(struct super_block *sb, struct dentry *dentry,
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const struct file_operations *fops, int mode,
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struct fpga_context *ctx)
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{
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static struct inode_operations fpgafs_file_iops = {
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.setattr = fpgafs_setattr,
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};
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struct inode *inode;
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int ret;
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ret = -ENOSPC;
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inode = fpgafs_new_inode(sb, S_IFREG | mode);
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if (!inode)
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goto out;
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ret = 0;
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inode->i_op = &fpgafs_file_iops;
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inode->i_fop = fops;
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//inode->i_private = SPUFS_I(inode)->i_ctx = get_spu_context(ctx);
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d_add(dentry, inode);
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out:
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return ret;
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}
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int fpgafs_mkdir( struct inode *dir, struct dentry *dentry, int mode)
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{
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int ret;
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struct inode *inode;
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struct fpga_context *ctx;
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ret = -ENOSPC;
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inode = fpgafs_new_inode(dir->i_sb, mode | S_IFDIR);
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if (!inode)
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goto unmutex;
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if (dir->i_mode & S_ISGID) {
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inode->i_gid = dir->i_gid;
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inode->i_mode &= S_ISGID;
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}
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// ctx = alloc fpga context ....
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// FPGAFS_I(inode)->i_ctx = ctx;
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//if (!ctx)
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// goto unmutex;
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inode->i_op = &fpgafs_simple_dir_inode_operations;
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inode->i_fop = &simple_dir_operations;
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ret = fpgafs_fill_dir(dentry, fpgafs_dir_contents, mode, ctx);
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ret = 0;
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//if (ret) {
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// FREEE CONTENT
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// goto unmutex;
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//}
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d_instantiate(dentry, inode);
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dget(dentry);
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dir->i_nlink++;
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dentry->d_inode->i_nlink++;
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unmutex:
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mutex_unlock(&inode->i_mutex);
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return ret;
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}
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static void fpgafs_prune_dir(struct dentry *dir)
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{
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struct dentry *dentry, *tmp;
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mutex_lock(&dir->d_inode->i_mutex);
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list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
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spin_lock(&dcache_lock);
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spin_lock(&dentry->d_lock);
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if (!(d_unhashed(dentry)) && dentry->d_inode) {
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dget_locked(dentry);
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__d_drop(dentry);
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spin_unlock(&dentry->d_lock);
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simple_unlink(dir->d_inode, dentry);
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spin_unlock(&dcache_lock);
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dput(dentry);
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} else {
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spin_unlock(&dentry->d_lock);
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spin_unlock(&dcache_lock);
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}
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}
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shrink_dcache_parent(dir);
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mutex_unlock(&dir->d_inode->i_mutex);
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}
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/* Caller must hold parent->i_mutex */
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static int fpgafs_rmdir(struct inode *dir, struct dentry *dentry)
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{
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/* remove all entries */
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// fpgafs_prune_dir(dir);
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//fpgafs_remove_inode
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return simple_rmdir(dir, dentry);
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}
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/* SUPERBLOCK operations */
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int fpgafs_fill_sb(struct super_block *sb, void *data, int silent)
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{
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struct inode *inode;
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int ret = -ENOMEM;
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static struct super_operations fpgafs_ops = {
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//.read_inode = fpgafs_read_inode,
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//.put_super = fpgafs_put_super,
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.alloc_inode = fpgafs_alloc_inode,
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.destroy_inode = fpgafs_destroy_inode,
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.statfs = simple_statfs,
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.delete_inode = fpgafs_delete_inode,
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.drop_inode = generic_delete_inode,
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};
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sb->s_maxbytes = MAX_LFS_FILESIZE;
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sb->s_blocksize = PAGE_CACHE_SIZE;
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sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
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sb->s_magic = FPGAFS_MAGIC;
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sb->s_op = &fpgafs_ops;
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inode = fpgafs_new_inode(sb, S_IFDIR | 0775);
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if (!inode)
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return ret;
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inode->i_op = &fpgafs_dir_inode_operations;
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inode->i_fop = &simple_dir_operations;
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FPGAFS_I(inode)->i_ctx = NULL;
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sb->s_root = d_alloc_root(inode);
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if (!sb->s_root)
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return ret;
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return 0;
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}
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static int fpgafs_get_sb(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data, struct vfsmount *mnt)
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{
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return get_sb_nodev(fs_type, flags, data, fpgafs_fill_sb, mnt);
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}
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static struct file_system_type fpgafs_type = {
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.owner = THIS_MODULE,
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.name = "fpgafs",
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.get_sb = fpgafs_get_sb,
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.kill_sb = kill_anon_super
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};
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static void fpgafs_init_once(void *p, struct kmem_cache * cachep,
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unsigned long flags)
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{
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struct fpgafs_inode_info *fsi = p;
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if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
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SLAB_CTOR_CONSTRUCTOR) {
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inode_init_once(&fsi->vfs_inode);
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}
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}
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/* init exit functions ... */
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int __init fpgafs_init(void)
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{
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fpgafs_inode_cache = kmem_cache_create("fpgafs_inode_cache",
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sizeof(struct fpgafs_inode_info), 0,
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SLAB_HWCACHE_ALIGN, fpgafs_init_once, NULL);
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if(!fpgafs_inode_cache)
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return -ENOMEM;
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register_filesystem(&fpgafs_type);
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return 0;
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}
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void __exit fpgafs_exit(void)
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{
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kmem_cache_destroy(fpgafs_inode_cache);
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unregister_filesystem(&fpgafs_type);
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}
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module_init(fpgafs_init);
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module_exit(fpgafs_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Benjamin Krill <ben@codiert.org>");
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