All the block device code goes here. Signed-off-by: Jared Hulbert <jaredeh@xxxxxxxxx> --- diff --git a/fs/axfs/axfs_bdev.c b/fs/axfs/axfs_bdev.c new file mode 100644 index 0000000..4c6f83c --- /dev/null +++ b/fs/axfs/axfs_bdev.c @@ -0,0 +1,158 @@ +/* + * Advanced XIP File System for Linux - AXFS + * Readonly, compressed, and XIP filesystem for Linux systems big and small + * + * Copyright(c) 2008 Numonyx + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * Authors: + * Jared Hulbert <jaredeh@xxxxxxxxx> + * + * Project url: http://axfs.sourceforge.net + * + * axfs_bdev.c - + * Allows axfs to use block devices or has dummy functions if block + * device support is compiled out of the kernel. + * + */ + +#include <linux/axfs.h> +#include <linux/mount.h> +#ifdef CONFIG_BLOCK +#include <linux/buffer_head.h> +#include <linux/namei.h> + +int axfs_fill_super(struct super_block *sb, void *data, int silent); + +int axfs_get_sb_bdev(struct file_system_type *fs_type, int flags, + const char *dev_name, struct axfs_super *sbi, + struct vfsmount *mnt, int *err) +{ + *err = get_sb_bdev(fs_type, flags, dev_name, sbi, axfs_fill_super, mnt); + + if (*err) + return FALSE; + return TRUE; +} + +void axfs_kill_block_super(struct super_block *sb) +{ + kill_block_super(sb); +} + +/****************************************************************************** + * + * axfs_copy_block_data + * + * Description: Helper function to read data from block device + * + * Parameters: + * (IN) sb - pointer to super block structure. + * + * (IN) dst_addr - pointer to buffer into which data is to be read. + * + * (IN) boffset - offset within block device + * + * (IN) len - length of data to be read + * + * Returns: + * 0 or error number + * + *****************************************************************************/ +int axfs_copy_block(struct super_block *sb, void *dst_addr, u64 fsoffset, + u64 len) +{ + struct axfs_super *sbi = AXFS_SB(sb); + u64 boffset = AXFS_FSOFFSET_2_DEVOFFSET(sbi, fsoffset); + u64 blocks; + u64 blksize = sb->s_blocksize; + unsigned long dst; + unsigned long src; + sector_t block; + size_t bytes; + struct buffer_head *bh; + u64 copied = 0; + + if (len == 0) + return 0; + + blocks = len / blksize; + if ((len % blksize) > 0) + blocks += 1; + + while (copied < len) { + /* Explicit casting for ARM linker errors. */ + block = (sector_t) boffset + (sector_t) copied; + block /= (sector_t) blksize; + bh = sb_bread(sb, block); + src = (unsigned long)bh->b_data; + dst = (unsigned long)dst_addr; + if (copied == 0) { + /* Explicit casting for ARM linker errors. */ + bytes = (size_t) blksize; + bytes -= (size_t) boffset % (size_t) blksize; + if (bytes > len) + bytes = len; + /* Explicit casting for ARM linker errors. */ + src += (unsigned long)boffset % (unsigned long)blksize; + } else { + dst += copied; + if ((len - copied) < blksize) { + bytes = len - copied; + } else { + bytes = blksize; + } + } + memcpy((void *)dst, (void *)src, bytes); + copied += bytes; + brelse(bh); + } + return 0; +} + +int axfs_is_dev_bdev(char *path) +{ + struct nameidata nd; + int ret = FALSE; + + if (!path) + return FALSE; + + if (path_lookup(path, LOOKUP_FOLLOW, &nd)) + return FALSE; + + if (S_ISBLK(nd.path.dentry->d_inode->i_mode)) + ret = TRUE; + + path_put(&nd.path); + return ret; +} + +#else + +int axfs_get_sb_bdev(struct file_system_type *fs_type, int flags, + const char *dev_name, struct axfs_super *sbi, + struct vfsmount *mnt, int *err) +{ + return FALSE; +} + +void axfs_kill_block_super(struct super_block *sb) +{ +} + +int axfs_copy_block(struct super_block *sb, void *dst_addr, u64 fsoffset, + u64 len) +{ + return -EINVAL; +} + +int axfs_is_dev_bdev(char *path) +{ + return FALSE; +} + +#endif /* CONFIG_BLOCK */ -- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
