diff options
Diffstat (limited to 'fs/adfs/dir.c')
| -rw-r--r-- | fs/adfs/dir.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/fs/adfs/dir.c b/fs/adfs/dir.c index 16a2639d3ca5..3c303074aa5e 100644 --- a/fs/adfs/dir.c +++ b/fs/adfs/dir.c @@ -14,6 +14,56 @@ */ static DEFINE_RWLOCK(adfs_dir_lock); +int adfs_dir_copyfrom(void *dst, struct adfs_dir *dir, unsigned int offset, + size_t len) +{ + struct super_block *sb = dir->sb; + unsigned int index, remain; + + index = offset >> sb->s_blocksize_bits; + offset &= sb->s_blocksize - 1; + remain = sb->s_blocksize - offset; + if (index + (remain < len) >= dir->nr_buffers) + return -EINVAL; + + if (remain < len) { + memcpy(dst, dir->bhs[index]->b_data + offset, remain); + dst += remain; + len -= remain; + index += 1; + offset = 0; + } + + memcpy(dst, dir->bhs[index]->b_data + offset, len); + + return 0; +} + +int adfs_dir_copyto(struct adfs_dir *dir, unsigned int offset, const void *src, + size_t len) +{ + struct super_block *sb = dir->sb; + unsigned int index, remain; + + index = offset >> sb->s_blocksize_bits; + offset &= sb->s_blocksize - 1; + remain = sb->s_blocksize - offset; + if (index + (remain < len) >= dir->nr_buffers) + return -EINVAL; + + if (remain < len) { + memcpy(dir->bhs[index]->b_data + offset, src, remain); + src += remain; + len -= remain; + index += 1; + offset = 0; + } + + memcpy(dir->bhs[index]->b_data + offset, src, len); + + return 0; +} + void adfs_dir_relse(struct adfs_dir *dir) { unsigned int i; |