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Added write_inode to ext2 driver

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pjht 2019-04-09 17:44:58 -05:00
parent ab5128bebd
commit a73508ecc2
1 changed files with 14 additions and 0 deletions
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14
fs/ext2.c
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@ -28,6 +28,7 @@ void* read_blk(int blknum,FILE* f,int num) {
fread(block,1,sizeof(uint8_t)*blk_size[num],f); fread(block,1,sizeof(uint8_t)*blk_size[num],f);
return block; return block;
} }
void write_blk(int blknum,void* block,FILE* f,int num) { void write_blk(int blknum,void* block,FILE* f,int num) {
fseek(f,blknum*blk_size[num],SEEK_SET); fseek(f,blknum*blk_size[num],SEEK_SET);
fwrite(block,1,sizeof(uint8_t)*blk_size[num],f); fwrite(block,1,sizeof(uint8_t)*blk_size[num],f);
@ -45,6 +46,19 @@ inode read_inode(uint32_t inode_num,FILE* f,int num) {
return inodes[offset]; return inodes[offset];
} }
void write_inode(uint32_t inode_num,inode node,FILE* f,int num) {
ext2_superblock supblk=supblks[num];
uint32_t grp=(inode_num-1)/supblk.s_inodes_per_group;
uint32_t index=(inode_num-1)%supblk.s_inodes_per_group;
uint32_t starting_blk=blk_grps[num][grp].bg_inode_table;
size_t inodes_per_blk=blk_size[num]/sizeof(inode);
uint32_t blk=starting_blk+(index/inodes_per_blk);
uint32_t offset=index%inodes_per_blk;
inode* inodes=read_blk(blk,f,num);
inodes[offset]=node;
write_blk(blk,inodes,f,num);
}
uint64_t get_sz(inode inode,int num) { uint64_t get_sz(inode inode,int num) {
uint64_t size=inode.i_size; uint64_t size=inode.i_size;
if (supblks[num].s_feature_rw_compat&EXT2_FEATURE_RW_COMPAT_LARGE_FILE) { if (supblks[num].s_feature_rw_compat&EXT2_FEATURE_RW_COMPAT_LARGE_FILE) {