939b00df03
This morning I needed to read a Minix V3 filesystem, but unfortunately my 2.6.19 did not support that, and neither did the downloaded 2.6.20rc4. Fortunately, google told me that Daniel Aragones had already done the work, patch found at http://www.terra.es/personal2/danarag/ Unfortunaly, looking at the patch was painful to my eyes, so I polished it a bit before applying. The resulting kernel boots, and reads the filesystem it needed to read. Signed-off-by: Daniel Aragones <danarag@gmail.com> Signed-off-by: Andries Brouwer <aeb@cwi.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
#include <linux/buffer_head.h>
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#include "minix.h"
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enum {DIRECT = 7, DEPTH = 4}; /* Have triple indirect */
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typedef u32 block_t; /* 32 bit, host order */
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static inline unsigned long block_to_cpu(block_t n)
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{
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return n;
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}
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static inline block_t cpu_to_block(unsigned long n)
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{
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return n;
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}
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static inline block_t *i_data(struct inode *inode)
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{
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return (block_t *)minix_i(inode)->u.i2_data;
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}
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static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
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{
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int n = 0;
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struct super_block *sb = inode->i_sb;
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if (block < 0) {
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printk("minix_bmap: block<0\n");
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} else if (block >= (minix_sb(inode->i_sb)->s_max_size/sb->s_blocksize)) {
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printk("minix_bmap: block>big\n");
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} else if (block < 7) {
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offsets[n++] = block;
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} else if ((block -= 7) < 256) {
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offsets[n++] = 7;
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offsets[n++] = block;
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} else if ((block -= 256) < 256*256) {
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offsets[n++] = 8;
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offsets[n++] = block>>8;
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offsets[n++] = block & 255;
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} else {
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block -= 256*256;
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offsets[n++] = 9;
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offsets[n++] = block>>16;
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offsets[n++] = (block>>8) & 255;
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offsets[n++] = block & 255;
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}
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return n;
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}
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#include "itree_common.c"
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int V2_minix_get_block(struct inode * inode, long block,
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struct buffer_head *bh_result, int create)
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{
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return get_block(inode, block, bh_result, create);
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}
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void V2_minix_truncate(struct inode * inode)
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{
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truncate(inode);
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}
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unsigned V2_minix_blocks(loff_t size, struct super_block *sb)
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{
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return nblocks(size, sb);
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}
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