From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- fs/minix/itree_v2.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 fs/minix/itree_v2.c (limited to 'fs/minix/itree_v2.c') diff --git a/fs/minix/itree_v2.c b/fs/minix/itree_v2.c new file mode 100644 index 000000000..78e2d93e5 --- /dev/null +++ b/fs/minix/itree_v2.c @@ -0,0 +1,76 @@ +#include +#include "minix.h" + +enum {DIRECT = 7, DEPTH = 4}; /* Have triple indirect */ + +typedef u32 block_t; /* 32 bit, host order */ + +static inline unsigned long block_to_cpu(block_t n) +{ + return n; +} + +static inline block_t cpu_to_block(unsigned long n) +{ + return n; +} + +static inline block_t *i_data(struct inode *inode) +{ + return (block_t *)minix_i(inode)->u.i2_data; +} + +#define DIRCOUNT 7 +#define INDIRCOUNT(sb) (1 << ((sb)->s_blocksize_bits - 2)) + +static int block_to_path(struct inode * inode, long block, int offsets[DEPTH]) +{ + int n = 0; + char b[BDEVNAME_SIZE]; + struct super_block *sb = inode->i_sb; + + if (block < 0) { + printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n", + block, bdevname(sb->s_bdev, b)); + } else if ((u64)block * (u64)sb->s_blocksize >= + minix_sb(sb)->s_max_size) { + if (printk_ratelimit()) + printk("MINIX-fs: block_to_path: " + "block %ld too big on dev %s\n", + block, bdevname(sb->s_bdev, b)); + } else if (block < DIRCOUNT) { + offsets[n++] = block; + } else if ((block -= DIRCOUNT) < INDIRCOUNT(sb)) { + offsets[n++] = DIRCOUNT; + offsets[n++] = block; + } else if ((block -= INDIRCOUNT(sb)) < INDIRCOUNT(sb) * INDIRCOUNT(sb)) { + offsets[n++] = DIRCOUNT + 1; + offsets[n++] = block / INDIRCOUNT(sb); + offsets[n++] = block % INDIRCOUNT(sb); + } else { + block -= INDIRCOUNT(sb) * INDIRCOUNT(sb); + offsets[n++] = DIRCOUNT + 2; + offsets[n++] = (block / INDIRCOUNT(sb)) / INDIRCOUNT(sb); + offsets[n++] = (block / INDIRCOUNT(sb)) % INDIRCOUNT(sb); + offsets[n++] = block % INDIRCOUNT(sb); + } + return n; +} + +#include "itree_common.c" + +int V2_minix_get_block(struct inode * inode, long block, + struct buffer_head *bh_result, int create) +{ + return get_block(inode, block, bh_result, create); +} + +void V2_minix_truncate(struct inode * inode) +{ + truncate(inode); +} + +unsigned V2_minix_blocks(loff_t size, struct super_block *sb) +{ + return nblocks(size, sb); +} -- cgit v1.2.3-54-g00ecf