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ycrfs.c 38.38 KiB
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#include <linux/buffer_head.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mpage.h>
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#include <linux/slab.h>
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#include <linux/statfs.h>
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#include <linux/version.h>
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#include "ycrfs.h"
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struct ycrfs_inode_info {
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	uint32_t iblock;
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	char i_data[32];
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	struct inode vfs_inode;
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};
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static const struct inode_operations ycrfs_inode_ops;
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static const struct inode_operations ycrfs_symlink_inode_ops;
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static const struct file_operations ycrfs_dir_ops;
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static const struct file_operations ycrfs_file_ops;
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static const struct address_space_operations ycrfs_aops;
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static inline uint32_t idiv_ceil(uint32_t a, uint32_t b)
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{
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	uint32_t ret = a / b;
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	if (a % b) {
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		return ret + 1;
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	}
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	return ret;
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}
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static inline uint32_t get_first_free_bits(unsigned long *freemap,
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					   unsigned long size, uint32_t len)
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{
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	uint32_t bit, prev = 0, count = 0;
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	for_each_set_bit(bit, freemap, size) {
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		if (prev != bit - 1) {
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			count = 0;
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		}
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		prev = bit;
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		if (++count == len) {
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			bitmap_clear(freemap, bit - len + 1, len);
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			return bit - len + 1;
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		}
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	}
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	return 0;
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}
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static inline uint32_t get_free_inode(struct ycrfs_sb_info *sbi)
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{
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	uint32_t ret =
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		get_first_free_bits(sbi->bfree_bitmap, sbi->nr_blocks, 1);
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	if (ret) {
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		sbi->nr_free_inodes--;
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	}
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	return ret;
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}
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static inline uint32_t get_free_blocks(struct ycrfs_sb_info *sbi, uint32_t len)
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{
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	uint32_t ret =
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		get_first_free_bits(sbi->bfree_bitmap, sbi->nr_blocks, len);
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	if (ret) {
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		sbi->nr_free_blocks -= len;
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	}
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return ret; } static inline uint32_t put_free_bits(unsigned long *freemap, unsigned long size, uint32_t i, uint32_t len) { if (i + len - 1 > size) { return -1; } bitmap_set(freemap, i, len); return 0; } static inline void put_inode(struct ycrfs_sb_info *sbi, uint32_t ino) { if (put_free_bits(sbi->ifree_bitmap, sbi->nr_inodes, ino, 1)) { return; } sbi->nr_free_inodes++; } static inline void put_blocks(struct ycrfs_sb_info *sbi, uint32_t bno, uint32_t len) { if (put_free_bits(sbi->ifree_bitmap, sbi->nr_blocks, bno, len)) { return; } sbi->nr_free_blocks += len; } static struct kmem_cache *ycrfs_inode_cache; int ycrfs_init_inode_cache(void) { ycrfs_inode_cache = kmem_cache_create( "ycrfs_cache", sizeof(struct ycrfs_inode_info), 0, 0, NULL); if (!ycrfs_inode_cache) { return -ENOMEM; } return 0; } void ycrfs_destroy_inode_cache(void) { kmem_cache_destroy(ycrfs_inode_cache); } struct inode *ycrfs_alloc_inode(struct super_block *sb) { struct ycrfs_inode_info *zi = kmem_cache_alloc(ycrfs_inode_cache, GFP_KERNEL); if (!zi) return NULL; inode_init_once(&zi->vfs_inode); return &zi->vfs_inode; } void ycrfs_destroy_inode(struct inode *inode) { struct ycrfs_inode_info *zi = container_of(inode, struct ycrfs_inode_info, vfs_inode); kmem_cache_free(ycrfs_inode_cache, zi); } static int ycrfs_write_inode(struct inode *inode, struct writeback_control *wbc) { struct ycrfs_inode *disk_inode; struct super_block *sb = inode->i_sb;