Ping.
Any chance of an Ack from somebody on this patch? I'm currently holding
off including it in the arch/metag tree.
Thanks
James
On 29/01/13 14:15, James Hogan wrote:
> Add the IMG Debug Adapter File System (DAFS) for metag, which uses
> SWITCH operations to communicate with a file server on a host computer
> via a JTAG debug adapter.
>
> Signed-off-by: James Hogan <james.ho...@imgtec.com>
> Cc: Alexander Viro <v...@zeniv.linux.org.uk>
> Cc: Andrew Morton <a...@linux-foundation.org>
> Cc: Mauro Carvalho Chehab <mche...@redhat.com>
> Cc: Cesar Eduardo Barros <ces...@cesarb.net>
> Cc: Joe Perches <j...@perches.com>
> Cc: "David S. Miller" <da...@davemloft.net>
> Cc: linux-fsde...@vger.kernel.org
> ---
> v4:
> * clean up fscall similarly to chancall in tty/metag_da
>
> v2:
> * fixed fserrno problem (Al Viro)
> * renamed to imgdafs
>
> MAINTAINERS | 1 +
> arch/metag/Kconfig | 1 +
> fs/Kconfig | 1 +
> fs/Makefile | 1 +
> fs/imgdafs/Kconfig | 6 +
> fs/imgdafs/Makefile | 7 +
> fs/imgdafs/imgdafs.h | 80 +++++
> fs/imgdafs/inode.c | 843
> ++++++++++++++++++++++++++++++++++++++++++++++++++
> 8 files changed, 940 insertions(+), 0 deletions(-)
> create mode 100644 fs/imgdafs/Kconfig
> create mode 100644 fs/imgdafs/Makefile
> create mode 100644 fs/imgdafs/imgdafs.h
> create mode 100644 fs/imgdafs/inode.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index cb89fe3..6b02aea 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -5044,6 +5044,7 @@ F: drivers/clocksource/metag_generic.c
> F: drivers/irqchip/irq-metag.c
> F: drivers/irqchip/irq-metag-ext.c
> F: drivers/tty/metag_da.c
> +F: fs/imgdafs/
>
> MICROBLAZE ARCHITECTURE
> M: Michal Simek <mon...@monstr.eu>
> diff --git a/arch/metag/Kconfig b/arch/metag/Kconfig
> index 9cba2f9..30adc78 100644
> --- a/arch/metag/Kconfig
> +++ b/arch/metag/Kconfig
> @@ -224,6 +224,7 @@ config METAG_DA
> This enables support for services provided by DA JTAG debug adapters,
> such as:
> - communication over DA channels (such as the console driver).
> + - use of the DA filesystem.
>
> menu "Boot options"
>
> diff --git a/fs/Kconfig b/fs/Kconfig
> index 780725a..6deefc1 100644
> --- a/fs/Kconfig
> +++ b/fs/Kconfig
> @@ -211,6 +211,7 @@ source "fs/sysv/Kconfig"
> source "fs/ufs/Kconfig"
> source "fs/exofs/Kconfig"
> source "fs/f2fs/Kconfig"
> +source "fs/imgdafs/Kconfig"
>
> endif # MISC_FILESYSTEMS
>
> diff --git a/fs/Makefile b/fs/Makefile
> index 9d53192..b070fca 100644
> --- a/fs/Makefile
> +++ b/fs/Makefile
> @@ -127,3 +127,4 @@ obj-$(CONFIG_F2FS_FS) += f2fs/
> obj-y += exofs/ # Multiple modules
> obj-$(CONFIG_CEPH_FS) += ceph/
> obj-$(CONFIG_PSTORE) += pstore/
> +obj-$(CONFIG_IMGDAFS_FS) += imgdafs/
> diff --git a/fs/imgdafs/Kconfig b/fs/imgdafs/Kconfig
> new file mode 100644
> index 0000000..5293adb
> --- /dev/null
> +++ b/fs/imgdafs/Kconfig
> @@ -0,0 +1,6 @@
> +config IMGDAFS_FS
> + bool "Meta DA filesystem support"
> + depends on METAG_DA
> + help
> + This enables the DA filesystem, which allows Linux to
> + to access files on a system attached via a debug adapter.
> diff --git a/fs/imgdafs/Makefile b/fs/imgdafs/Makefile
> new file mode 100644
> index 0000000..169a3c6
> --- /dev/null
> +++ b/fs/imgdafs/Makefile
> @@ -0,0 +1,7 @@
> +#
> +# Makefile for DAfs the Debug Adapter filesystem.
> +#
> +
> +obj-$(CONFIG_IMGDAFS_FS) += imgdafs.o
> +
> +imgdafs-objs := inode.o
> diff --git a/fs/imgdafs/imgdafs.h b/fs/imgdafs/imgdafs.h
> new file mode 100644
> index 0000000..6c1da13
> --- /dev/null
> +++ b/fs/imgdafs/imgdafs.h
> @@ -0,0 +1,80 @@
> +#ifndef _IMGDAFS_H_
> +#define _IMGDAFS_H_
> +
> +#define DA_OP_OPEN 0
> +#define DA_OP_CREAT 1
> +#define DA_OP_READ 2
> +#define DA_OP_WRITE 3
> +#define DA_OP_CLOSE 4
> +#define DA_OP_LINK 5
> +#define DA_OP_LSEEK 6
> +#define DA_OP_UNLINK 7
> +#define DA_OP_ISATTY 8
> +#define DA_OP_FCNTL 9
> +#define DA_OP_STAT 10
> +#define DA_OP_FSTAT 11
> +#define DA_OP_GETCWD 12
> +#define DA_OP_CHDIR 13
> +#define DA_OP_MKDIR 14
> +#define DA_OP_RMDIR 15
> +#define DA_OP_FINDFIRST 16
> +#define DA_OP_FINDNEXT 17
> +#define DA_OP_FINDCLOSE 18
> +#define DA_OP_CHMOD 19
> +#define DA_OP_PREAD 20
> +#define DA_OP_PWRITE 21
> +
> +#define OS_TYPE_FILE 1
> +#define OS_TYPE_DIR 2
> +#define OS_TYPE_SYMLINK 3
> +#define OS_TYPE_CHARDEV 4
> +#define OS_TYPE_BLOCKDEV 5
> +#define OS_TYPE_FIFO 6
> +#define OS_TYPE_SOCK 7
> +
> +#define DA_O_RDONLY 0
> +#define DA_O_WRONLY 1
> +#define DA_O_RDWR 2
> +#define DA_O_APPEND 8
> +#define DA_O_CREAT 0x0200
> +#define DA_O_TRUNC 0x0400
> +#define DA_O_EXCL 0x0800
> +
> +#define DA_O_AFFINITY_THREAD_0 0x10000
> +#define DA_O_AFFINITY_THREAD_1 0x20000
> +#define DA_O_AFFINITY_THREAD_2 0x40000
> +#define DA_O_AFFINITY_THREAD_3 0x80000
> +#define DA_O_AFFINITY_SHIFT 16
> +
> +#define DA_S_IWUSR 0200 /* 0x80 */
> +#define DA_S_IRUSR 0400 /* 0x100 */
> +
> +struct da_stat {
> + short st_dev;
> + unsigned short st_ino;
> + unsigned st_mode;
> + unsigned short st_nlink;
> + unsigned short st_uid;
> + unsigned short st_gid;
> + short st_rdev;
> + int st_size;
> + int st_atime;
> + int st_spare1;
> + int st_mtime;
> + int st_spare2;
> + int st_ctime;
> + int st_spare3;
> + int st_blksize;
> + int st_blocks;
> + int st_spare4[2];
> +};
> +
> +#define _A_SUBDIR 0x10
> +
> +struct da_finddata {
> + unsigned long size;
> + unsigned long attrib;
> + char name[260];
> +};
> +
> +#endif
> diff --git a/fs/imgdafs/inode.c b/fs/imgdafs/inode.c
> new file mode 100644
> index 0000000..5808d90
> --- /dev/null
> +++ b/fs/imgdafs/inode.c
> @@ -0,0 +1,843 @@
> +/*
> + * Copyright (C) 2008,2009,2010 Imagination Technologies Ltd.
> + * Licensed under the GPL
> + *
> + * Based on hostfs for UML.
> + *
> + */
> +
> +#include <linux/fs.h>
> +#include <linux/module.h>
> +#include <linux/mm.h>
> +#include <linux/pagemap.h>
> +#include <linux/seq_file.h>
> +#include <linux/mount.h>
> +#include <linux/slab.h>
> +
> +#include <asm/da.h>
> +#include <asm/hwthread.h>
> +
> +#include "imgdafs.h"
> +
> +static int fscall(int in_system_call, int in_arg1, int in_arg2, int in_arg3,
> + int in_arg4, int in_arg5, int *fserrno)
> +{
> + register int arg1 asm("D1Ar1") = in_arg1;
> + register int arg2 asm("D0Ar2") = in_arg2;
> + register int arg3 asm("D1Ar3") = in_arg3;
> + register int arg4 asm("D0Ar4") = in_arg4;
> + register int arg5 asm("D1Ar5") = in_arg5;
> + register int system_call asm("D0Ar6") = in_system_call;
> + register int result asm("D0Re0");
> + register int errno asm("D1Re0");
> +
> + asm volatile (
> + "MSETL [A0StP++], %7,%5,%3\n\t"
> + "ADD A0StP, A0StP, #8\n\t"
> + "SWITCH #0x0C00208\n\t"
> + "GETL %0, %1, [A0StP+#-8]\n\t"
> + "SUB A0StP, A0StP, #(4*6)+8\n\t"
> + : "=r" (result),
> + "=r" (errno)
> + : "r" (arg1),
> + "r" (arg2),
> + "r" (arg3),
> + "r" (arg4),
> + "r" (arg5),
> + "r" (system_call)
> + : "memory");
> +
> + if (fserrno)
> + *fserrno = errno;
> +
> + return result;
> +}
> +
> +struct dafs_inode_info {
> + int fd;
> + int mode;
> + struct inode vfs_inode;
> +};
> +
> +static inline struct dafs_inode_info *DAFS_I(struct inode *inode)
> +{
> + return container_of(inode, struct dafs_inode_info, vfs_inode);
> +}
> +
> +#define FILE_DAFS_I(file) DAFS_I((file)->f_path.dentry->d_inode)
> +
> +static int dafs_d_delete(const struct dentry *dentry)
> +{
> + return 1;
> +}
> +
> +static const struct dentry_operations dafs_dentry_ops = {
> + .d_delete = dafs_d_delete,
> +};
> +
> +#define DAFS_SUPER_MAGIC 0xdadadaf5
> +
> +static const struct inode_operations dafs_iops;
> +static const struct inode_operations dafs_dir_iops;
> +
> +static char *__dentry_name(struct dentry *dentry, char *name)
> +{
> + char *p = dentry_path_raw(dentry, name, PATH_MAX);
> + char *root;
> + size_t len;
> +
> + root = dentry->d_sb->s_fs_info;
> + len = strlen(root);
> + if (IS_ERR(p)) {
> + __putname(name);
> + return NULL;
> + }
> +
> + strlcpy(name, root, PATH_MAX);
> + if (len > p - name) {
> + __putname(name);
> + return NULL;
> + }
> + if (p > name + len) {
> + char *s = name + len;
> + while ((*s++ = *p++) != '\0')
> + ;
> + }
> + return name;
> +}
> +
> +static char *dentry_name(struct dentry *dentry)
> +{
> + char *name = __getname();
> + if (!name)
> + return NULL;
> +
> + return __dentry_name(dentry, name); /* will unlock */
> +}
> +
> +static int stat_file(const char *path, struct da_stat *p, int fd)
> +{
> + int ret;
> + int fserrno;
> + memset(p, 0, sizeof(*p));
> +
> + if (fd >= 0) {
> + ret = fscall(DA_OP_FSTAT, fd, (int)p, 0, 0, 0, &fserrno);
> + if (ret < 0) {
> + /* Some versions of Codescape do not fill out errno. */
> + if (ret < 0 && fserrno == 0)
> + fserrno = ENOENT;
> + return -fserrno;
> + }
> + } else {
> + ret = fscall(DA_OP_STAT, (int)path, (int)p, strlen(path), 0, 0,
> + &fserrno);
> + if (ret < 0) {
> + /* Some versions of Codescape do not fill out errno. */
> + if (ret < 0 && fserrno == 0)
> + fserrno = ENOENT;
> + return -fserrno;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static struct inode *dafs_iget(struct super_block *sb)
> +{
> + struct inode *inode = new_inode(sb);
> + if (!inode)
> + return ERR_PTR(-ENOMEM);
> + return inode;
> +}
> +
> +static struct inode *dafs_alloc_inode(struct super_block *sb)
> +{
> + struct dafs_inode_info *hi;
> +
> + hi = kzalloc(sizeof(*hi), GFP_KERNEL);
> + if (hi == NULL)
> + return NULL;
> +
> + hi->fd = -1;
> + inode_init_once(&hi->vfs_inode);
> + return &hi->vfs_inode;
> +}
> +
> +static void close_file(void *stream)
> +{
> + int fd = *((int *) stream);
> +
> + fscall(DA_OP_CLOSE, fd, 0, 0, 0, 0, NULL);
> +}
> +
> +static void dafs_evict_inode(struct inode *inode)
> +{
> + truncate_inode_pages(&inode->i_data, 0);
> + clear_inode(inode);
> + if (DAFS_I(inode)->fd != -1) {
> + close_file(&DAFS_I(inode)->fd);
> + DAFS_I(inode)->fd = -1;
> + }
> +}
> +
> +static void dafs_i_callback(struct rcu_head *head)
> +{
> + struct inode *inode = container_of(head, struct inode, i_rcu);
> + kfree(DAFS_I(inode));
> +}
> +
> +static void dafs_destroy_inode(struct inode *inode)
> +{
> + call_rcu(&inode->i_rcu, dafs_i_callback);
> +}
> +
> +static const struct super_operations dafs_sbops = {
> + .alloc_inode = dafs_alloc_inode,
> + .drop_inode = generic_delete_inode,
> + .evict_inode = dafs_evict_inode,
> + .destroy_inode = dafs_destroy_inode,
> +};
> +
> +static int open_dir(char *path, struct da_finddata *finddata, int *fserrno)
> +{
> + int len = strlen(path);
> + char buf[len + 3];
> +
> + strcpy(buf, path);
> + if (buf[len - 1] != '/')
> + strcat(buf, "/*");
> + else
> + strcat(buf, "*");
> +
> + return fscall(DA_OP_FINDFIRST, (int)buf, (int)finddata, 0, 0, 0,
> + fserrno);
> +}
> +
> +static void close_dir(int handle)
> +{
> + fscall(DA_OP_FINDCLOSE, handle, 0, 0, 0, 0, NULL);
> +}
> +
> +static int read_dir(int handle, struct da_finddata *finddata)
> +{
> + return fscall(DA_OP_FINDNEXT, handle, (int)finddata, 0, 0, 0, NULL);
> +}
> +
> +static int dafs_readdir(struct file *file, void *ent, filldir_t filldir)
> +{
> + struct inode *inode = file->f_path.dentry->d_inode;
> + struct super_block *sb = inode->i_sb;
> + char *name;
> + int handle;
> + int fserrno;
> + unsigned long long next, ino;
> + int error = 0;
> + struct da_finddata finddata;
> +
> + name = dentry_name(file->f_path.dentry);
> + if (name == NULL)
> + return -ENOMEM;
> + handle = open_dir(name, &finddata, &fserrno);
> + __putname(name);
> + if (handle == -1)
> + return -fserrno;
> +
> + next = 1;
> +
> + if (file->f_pos == 0) {
> + error = (*filldir)(ent, ".", file->f_pos + 1,
> + file->f_pos, inode->i_ino,
> + DT_DIR);
> + if (error < 0)
> + goto out;
> + file->f_pos++;
> + }
> +
> + while (1) {
> + error = read_dir(handle, &finddata);
> + if (error)
> + break;
> +
> + if (next >= file->f_pos) {
> + size_t len = strlen(finddata.name);
> + ino = iunique(sb, 100);
> + error = (*filldir)(ent, finddata.name, len,
> + file->f_pos, ino,
> + (finddata.attrib & _A_SUBDIR) ?
> + DT_DIR : DT_REG);
> + if (error)
> + break;
> + file->f_pos++;
> + }
> + next++;
> + }
> +out:
> + close_dir(handle);
> + return 0;
> +}
> +
> +static int dafs_file_open(struct inode *ino, struct file *file)
> +{
> + static DEFINE_MUTEX(open_mutex);
> + char *name;
> + int mode, fmode, flags = 0, r = 0, w = 0, fd;
> + int cpu;
> +
> + fmode = file->f_mode & (FMODE_READ | FMODE_WRITE);
> + if ((fmode & DAFS_I(ino)->mode) == fmode)
> + return 0;
> +
> + mode = ino->i_mode & (DA_S_IWUSR | DA_S_IRUSR);
> +
> + mode |= DAFS_I(ino)->mode;
> +
> + DAFS_I(ino)->mode |= fmode;
> + if (DAFS_I(ino)->mode & FMODE_READ)
> + r = 1;
> + if (DAFS_I(ino)->mode & FMODE_WRITE) {
> + w = 1;
> + r = 1;
> + }
> +
> +retry:
> + if (r && !w)
> + flags |= DA_O_RDONLY;
> + else if (!r && w)
> + flags |= DA_O_WRONLY;
> + else if (r && w)
> + flags |= DA_O_RDWR;
> +
> + if (file->f_flags & O_CREAT)
> + flags |= DA_O_CREAT;
> +
> + if (file->f_flags & O_TRUNC)
> + flags |= DA_O_TRUNC;
> +
> + /*
> + * Set the affinity for this file handle to all CPUs. If we
> + * don't do this then, if the process that opened the file
> + * migrates to a different cpu, the FileServer will not accept
> + * the file handle.
> + */
> + for_each_possible_cpu(cpu) {
> + u8 hwthread = cpu_2_hwthread_id[cpu];
> + flags |= (1 << (DA_O_AFFINITY_SHIFT + hwthread));
> + }
> +
> + name = dentry_name(file->f_path.dentry);
> + if (name == NULL)
> + return -ENOMEM;
> +
> + fd = fscall(DA_OP_OPEN, (int)name, flags, mode, strlen(name), 0, NULL);
> + __putname(name);
> + if (fd < 0)
> + return fd;
> +
> + mutex_lock(&open_mutex);
> + /* somebody else had handled it first? */
> + if ((mode & DAFS_I(ino)->mode) == mode) {
> + mutex_unlock(&open_mutex);
> + return 0;
> + }
> + if ((mode | DAFS_I(ino)->mode) != mode) {
> + mode |= DAFS_I(ino)->mode;
> + mutex_unlock(&open_mutex);
> + close_file(&fd);
> + goto retry;
> + }
> + DAFS_I(ino)->fd = fd;
> + DAFS_I(ino)->mode = mode;
> + mutex_unlock(&open_mutex);
> +
> + return 0;
> +}
> +
> +static const struct file_operations dafs_file_fops = {
> + .llseek = generic_file_llseek,
> + .read = do_sync_read,
> + .splice_read = generic_file_splice_read,
> + .aio_read = generic_file_aio_read,
> + .aio_write = generic_file_aio_write,
> + .write = do_sync_write,
> + .mmap = generic_file_mmap,
> + .open = dafs_file_open,
> + .release = NULL,
> +};
> +
> +static const struct file_operations dafs_dir_fops = {
> + .llseek = generic_file_llseek,
> + .readdir = dafs_readdir,
> + .read = generic_read_dir,
> +};
> +
> +static int read_file(int fd, unsigned long long *offset, const char *buf,
> + int len)
> +{
> + int n;
> + int fserrno;
> +
> + n = fscall(DA_OP_PREAD, fd, (int)buf, len, (int)*offset, 0, &fserrno);
> +
> + if (n < 0)
> + return -fserrno;
> +
> + return n;
> +}
> +
> +static int write_file(int fd, unsigned long long *offset, const char *buf,
> + int len)
> +{
> + int n;
> + int fserrno;
> +
> + n = fscall(DA_OP_PWRITE, fd, (int)buf, len, (int)*offset, 0, &fserrno);
> +
> + if (n < 0)
> + return -fserrno;
> +
> + return n;
> +}
> +
> +static int dafs_writepage(struct page *page, struct writeback_control *wbc)
> +{
> + struct address_space *mapping = page->mapping;
> + struct inode *inode = mapping->host;
> + char *buffer;
> + unsigned long long base;
> + int count = PAGE_CACHE_SIZE;
> + int end_index = inode->i_size >> PAGE_CACHE_SHIFT;
> + int err;
> +
> + if (page->index >= end_index)
> + count = inode->i_size & (PAGE_CACHE_SIZE-1);
> +
> + buffer = kmap(page);
> + base = ((unsigned long long) page->index) << PAGE_CACHE_SHIFT;
> +
> + err = write_file(DAFS_I(inode)->fd, &base, buffer, count);
> + if (err != count) {
> + ClearPageUptodate(page);
> + goto out;
> + }
> +
> + if (base > inode->i_size)
> + inode->i_size = base;
> +
> + if (PageError(page))
> + ClearPageError(page);
> + err = 0;
> +
> + out:
> + kunmap(page);
> +
> + unlock_page(page);
> + return err;
> +}
> +
> +static int dafs_readpage(struct file *file, struct page *page)
> +{
> + char *buffer;
> + long long start;
> + int err = 0;
> +
> + start = (long long) page->index << PAGE_CACHE_SHIFT;
> + buffer = kmap(page);
> + err = read_file(FILE_DAFS_I(file)->fd, &start, buffer,
> + PAGE_CACHE_SIZE);
> + if (err < 0)
> + goto out;
> +
> + memset(&buffer[err], 0, PAGE_CACHE_SIZE - err);
> +
> + flush_dcache_page(page);
> + SetPageUptodate(page);
> + if (PageError(page))
> + ClearPageError(page);
> + err = 0;
> + out:
> + kunmap(page);
> + unlock_page(page);
> + return err;
> +}
> +
> +static int dafs_write_begin(struct file *file, struct address_space *mapping,
> + loff_t pos, unsigned len, unsigned flags,
> + struct page **pagep, void **fsdata)
> +{
> + pgoff_t index = pos >> PAGE_CACHE_SHIFT;
> +
> + *pagep = grab_cache_page_write_begin(mapping, index, flags);
> + if (!*pagep)
> + return -ENOMEM;
> + return 0;
> +}
> +
> +static int dafs_write_end(struct file *file, struct address_space *mapping,
> + loff_t pos, unsigned len, unsigned copied,
> + struct page *page, void *fsdata)
> +{
> + struct inode *inode = mapping->host;
> + void *buffer;
> + unsigned from = pos & (PAGE_CACHE_SIZE - 1);
> + int err;
> +
> + buffer = kmap(page);
> + err = write_file(FILE_DAFS_I(file)->fd, &pos, buffer + from, copied);
> + kunmap(page);
> +
> + if (!PageUptodate(page) && err == PAGE_CACHE_SIZE)
> + SetPageUptodate(page);
> +
> + /*
> + * If err > 0, write_file has added err to pos, so we are comparing
> + * i_size against the last byte written.
> + */
> + if (err > 0 && (pos > inode->i_size))
> + inode->i_size = pos;
> + unlock_page(page);
> + page_cache_release(page);
> +
> + return err;
> +}
> +
> +static const struct address_space_operations dafs_aops = {
> + .writepage = dafs_writepage,
> + .readpage = dafs_readpage,
> + .set_page_dirty = __set_page_dirty_nobuffers,
> + .write_begin = dafs_write_begin,
> + .write_end = dafs_write_end,
> +};
> +
> +static int read_name(struct inode *ino, char *name)
> +{
> + dev_t rdev;
> + struct da_stat st;
> + int err = stat_file(name, &st, -1);
> + if (err)
> + return err;
> +
> + /* No valid maj and min from DA.*/
> + rdev = MKDEV(0, 0);
> +
> + switch (st.st_mode & S_IFMT) {
> + case S_IFDIR:
> + ino->i_op = &dafs_dir_iops;
> + ino->i_fop = &dafs_dir_fops;
> + break;
> + case S_IFCHR:
> + case S_IFBLK:
> + case S_IFIFO:
> + case S_IFSOCK:
> + init_special_inode(ino, st.st_mode & S_IFMT, rdev);
> + ino->i_op = &dafs_iops;
> + break;
> +
> + case S_IFLNK:
> + default:
> + ino->i_op = &dafs_iops;
> + ino->i_fop = &dafs_file_fops;
> + ino->i_mapping->a_ops = &dafs_aops;
> + }
> +
> + ino->i_ino = st.st_ino;
> + ino->i_mode = st.st_mode;
> + set_nlink(ino, st.st_nlink);
> +
> + i_uid_write(ino, st.st_uid);
> + i_gid_write(ino, st.st_gid);
> + ino->i_atime.tv_sec = st.st_atime;
> + ino->i_atime.tv_nsec = 0;
> + ino->i_mtime.tv_sec = st.st_mtime;
> + ino->i_mtime.tv_nsec = 0;
> + ino->i_ctime.tv_sec = st.st_ctime;
> + ino->i_ctime.tv_nsec = 0;
> + ino->i_size = st.st_size;
> + ino->i_blocks = st.st_blocks;
> + return 0;
> +}
> +
> +static int dafs_create(struct inode *dir, struct dentry *dentry, umode_t
> mode,
> + bool excl)
> +{
> + struct inode *inode;
> + char *name;
> + int error, fd;
> + int damode;
> + int creat_flags = DA_O_TRUNC | DA_O_CREAT | DA_O_WRONLY;
> + int cpu;
> +
> + inode = dafs_iget(dir->i_sb);
> + if (IS_ERR(inode)) {
> + error = PTR_ERR(inode);
> + goto out;
> + }
> +
> + damode = mode & (DA_S_IWUSR | DA_S_IRUSR);
> +
> + error = -ENOMEM;
> + name = dentry_name(dentry);
> + if (name == NULL)
> + goto out_put;
> +
> + /*
> + * creat() will only create text mode files on a Windows host
> + * at present. Replicate the creat() functionality with an
> + * open() call, which always creates binary files. Set the
> + * affinity to all hardware threads.
> + */
> + for_each_possible_cpu(cpu) {
> + u8 hwthread = cpu_2_hwthread_id[cpu];
> + creat_flags |= (1 << (DA_O_AFFINITY_SHIFT + hwthread));
> + }
> +
> + fd = fscall(DA_OP_OPEN, (int)name, creat_flags, damode, strlen(name),
> + 0, NULL);
> + if (fd < 0)
> + error = fd;
> + else
> + error = read_name(inode, name);
> +
> + kfree(name);
> + if (error)
> + goto out_put;
> +
> + DAFS_I(inode)->fd = fd;
> + DAFS_I(inode)->mode = FMODE_READ | FMODE_WRITE;
> + d_instantiate(dentry, inode);
> + return 0;
> +
> + out_put:
> + iput(inode);
> + out:
> + return error;
> +}
> +
> +static struct dentry *dafs_lookup(struct inode *ino, struct dentry *dentry,
> + unsigned int flags)
> +{
> + struct inode *inode;
> + char *name;
> + int err;
> +
> + inode = dafs_iget(ino->i_sb);
> + if (IS_ERR(inode)) {
> + err = PTR_ERR(inode);
> + goto out;
> + }
> +
> + err = -ENOMEM;
> + name = dentry_name(dentry);
> + if (name == NULL)
> + goto out_put;
> +
> + err = read_name(inode, name);
> +
> + __putname(name);
> + if (err == -ENOENT) {
> + iput(inode);
> + inode = NULL;
> + } else if (err)
> + goto out_put;
> +
> + d_add(dentry, inode);
> + return NULL;
> +
> + out_put:
> + iput(inode);
> + out:
> + return ERR_PTR(err);
> +}
> +
> +static int dafs_link(struct dentry *to, struct inode *ino, struct dentry
> *from)
> +{
> + char *from_name, *to_name;
> + int err;
> +
> + from_name = dentry_name(from);
> + if (from_name == NULL)
> + return -ENOMEM;
> + to_name = dentry_name(to);
> + if (to_name == NULL) {
> + __putname(from_name);
> + return -ENOMEM;
> + }
> + err = -EINVAL;
> + __putname(from_name);
> + __putname(to_name);
> + return err;
> +}
> +
> +static int dafs_unlink(struct inode *ino, struct dentry *dentry)
> +{
> + char *file;
> + int err;
> + int fserrno;
> +
> + file = dentry_name(dentry);
> + if (file == NULL)
> + return -ENOMEM;
> +
> + err = fscall(DA_OP_UNLINK, (int)file, 0, 0, 0, 0, &fserrno);
> + __putname(file);
> + if (err)
> + return -fserrno;
> + return 0;
> +}
> +
> +static int do_mkdir(const char *file, int mode)
> +{
> + int err;
> + int fserrno;
> +
> + err = fscall(DA_OP_MKDIR, (int)file, mode, strlen(file), 0, 0,
> + &fserrno);
> + if (err)
> + return -fserrno;
> + return 0;
> +}
> +
> +static int dafs_mkdir(struct inode *ino, struct dentry *dentry, umode_t mode)
> +{
> + char *file;
> + int err;
> +
> + file = dentry_name(dentry);
> + if (file == NULL)
> + return -ENOMEM;
> + err = do_mkdir(file, mode);
> + __putname(file);
> + return err;
> +}
> +
> +static int do_rmdir(const char *file)
> +{
> + int err;
> + int fserrno;
> +
> + err = fscall(DA_OP_RMDIR, (int)file, strlen(file), 0, 0, 0, &fserrno);
> + if (err)
> + return -fserrno;
> + return 0;
> +}
> +
> +static int dafs_rmdir(struct inode *ino, struct dentry *dentry)
> +{
> + char *file;
> + int err;
> +
> + file = dentry_name(dentry);
> + if (file == NULL)
> + return -ENOMEM;
> + err = do_rmdir(file);
> + __putname(file);
> + return err;
> +}
> +
> +static int dafs_rename(struct inode *from_ino, struct dentry *from,
> + struct inode *to_ino, struct dentry *to)
> +{
> + char *from_name, *to_name;
> + int err;
> +
> + from_name = dentry_name(from);
> + if (from_name == NULL)
> + return -ENOMEM;
> + to_name = dentry_name(to);
> + if (to_name == NULL) {
> + __putname(from_name);
> + return -ENOMEM;
> + }
> + err = -EINVAL;
> + __putname(from_name);
> + __putname(to_name);
> + return err;
> +}
> +
> +static const struct inode_operations dafs_iops = {
> + .create = dafs_create,
> + .link = dafs_link,
> + .unlink = dafs_unlink,
> + .mkdir = dafs_mkdir,
> + .rmdir = dafs_rmdir,
> + .rename = dafs_rename,
> +};
> +
> +static const struct inode_operations dafs_dir_iops = {
> + .create = dafs_create,
> + .lookup = dafs_lookup,
> + .link = dafs_link,
> + .unlink = dafs_unlink,
> + .mkdir = dafs_mkdir,
> + .rmdir = dafs_rmdir,
> + .rename = dafs_rename,
> +};
> +
> +static char *host_root_path = ".";
> +
> +static int dafs_fill_sb_common(struct super_block *sb, void *d, int silent)
> +{
> + struct inode *root_inode;
> + int err;
> +
> + sb->s_blocksize = 1024;
> + sb->s_blocksize_bits = 10;
> + sb->s_magic = DAFS_SUPER_MAGIC;
> + sb->s_op = &dafs_sbops;
> + sb->s_d_op = &dafs_dentry_ops;
> + sb->s_maxbytes = MAX_LFS_FILESIZE;
> +
> + err = -ENOMEM;
> +
> + root_inode = new_inode(sb);
> + if (!root_inode)
> + goto out;
> +
> + err = read_name(root_inode, host_root_path);
> + if (err)
> + goto out_put;
> +
> + err = -ENOMEM;
> + sb->s_fs_info = host_root_path;
> + sb->s_root = d_make_root(root_inode);
> + if (sb->s_root == NULL)
> + goto out;
> +
> + return 0;
> +
> +out_put:
> + iput(root_inode);
> +out:
> + return err;
> +}
> +
> +static struct dentry *dafs_read_sb(struct file_system_type *type,
> + int flags, const char *dev_name,
> + void *data)
> +{
> + if (!metag_da_enabled())
> + return ERR_PTR(-ENODEV);
> + return mount_nodev(type, flags, data, dafs_fill_sb_common);
> +}
> +
> +static struct file_system_type dafs_type = {
> + .owner = THIS_MODULE,
> + .name = "imgdafs",
> + .mount = dafs_read_sb,
> + .kill_sb = kill_anon_super,
> + .fs_flags = 0,
> +};
> +
> +static int __init init_dafs(void)
> +{
> + return register_filesystem(&dafs_type);
> +}
> +
> +static void __exit exit_dafs(void)
> +{
> + unregister_filesystem(&dafs_type);
> +}
> +
> +module_init(init_dafs)
> +module_exit(exit_dafs)
> +MODULE_LICENSE("GPL");
>
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