static errcode_t ocfs2_try_to_write_inline_data(ocfs2_cached_inode *ci,
void *buf, uint32_t count,
uint64_t offset)
{
int ret;
uint64_t end = offset + count;
ocfs2_filesys *fs = ci->ci_fs;
struct ocfs2_dinode *di = ci->ci_inode;
/* Handle inodes which already have inline data 1st. */
if (di->i_dyn_features & OCFS2_INLINE_DATA_FL) {
if (ocfs2_size_fits_inline_data(ci->ci_inode, end))
goto do_inline_write;
/*
* The write won't fit - we have to give this inode an
* inline extent list now.
*/
ret = ocfs2_convert_inline_data_to_extents(ci);
if (!ret)
ret = OCFS2_ET_CANNOT_INLINE_DATA;
goto out;
}
if (di->i_clusters > 0 || end > ocfs2_max_inline_data(fs->fs_blocksize))
return OCFS2_ET_CANNOT_INLINE_DATA;
ocfs2_set_inode_data_inline(fs, ci->ci_inode);
ci->ci_inode->i_dyn_features |= OCFS2_INLINE_DATA_FL;
do_inline_write:
ret = ocfs2_inline_data_write(di, buf, count, offset);
if (ret)
goto out;
ret = ocfs2_write_cached_inode(fs, ci);
out:
return ret;
}
int ocfs2_read_inline_data(struct inode *inode, struct page *page,
struct buffer_head *di_bh)
{
void *kaddr;
loff_t size;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
if (!(le16_to_cpu(di->i_dyn_features) & OCFS2_INLINE_DATA_FL)) {
ocfs2_error(inode->i_sb, "Inode %llu lost inline data flag",
(unsigned long long)OCFS2_I(inode)->ip_blkno);
return -EROFS;
}
size = i_size_read(inode);
if (size > PAGE_CACHE_SIZE ||
size > ocfs2_max_inline_data(inode->i_sb)) {
ocfs2_error(inode->i_sb,
"Inode %llu has with inline data has bad size: %Lu",
(unsigned long long)OCFS2_I(inode)->ip_blkno,
(unsigned long long)size);
return -EROFS;
}
kaddr = kmap_atomic(page, KM_USER0);
if (size)
memcpy(kaddr, di->id2.i_data.id_data, size);
/* Clear the remaining part of the page */
memset(kaddr + size, 0, PAGE_CACHE_SIZE - size);
flush_dcache_page(page);
kunmap_atomic(kaddr, KM_USER0);
SetPageUptodate(page);
return 0;
}
