On Thu, Aug 21, 2008 at 2:45 PM, Jared Hulbert <jaredeh@xxxxxxxxx> wrote: > 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; blocks ?? You have to drop blocks variable since anyone don't use it. > + 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 > -- Kinds regards, MinChan Kim -- 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
