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f2fs: support fiemap on compressed inode

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Map normal/compressed cluster of compressed inode correctly, and give
the right fiemap flag FIEMAP_EXTENT_ENCODED on mapped compressed extent.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2020-03-28 17:40:40 +08:00 committed by Jaegeuk Kim
parent 3265d3db1f
commit bf38fbad12
1 changed files with 53 additions and 2 deletions
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55
fs/f2fs/data.c
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@ -1832,6 +1832,25 @@ static int f2fs_xattr_fiemap(struct inode *inode,
return (err < 0 ? err : 0);
}
static loff_t max_inode_blocks(struct inode *inode)
{
loff_t result = ADDRS_PER_INODE(inode);
loff_t leaf_count = ADDRS_PER_BLOCK(inode);
/* two direct node blocks */
result += (leaf_count * 2);
/* two indirect node blocks */
leaf_count *= NIDS_PER_BLOCK;
result += (leaf_count * 2);
/* one double indirect node block */
leaf_count *= NIDS_PER_BLOCK;
result += leaf_count;
return result;
}
int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
u64 start, u64 len)
{
@ -1841,6 +1860,8 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
u64 logical = 0, phys = 0, size = 0;
u32 flags = 0;
int ret = 0;
bool compr_cluster = false;
unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) {
ret = f2fs_precache_extents(inode);
@ -1875,6 +1896,9 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
memset(&map_bh, 0, sizeof(struct buffer_head));
map_bh.b_size = len;
if (compr_cluster)
map_bh.b_size = blk_to_logical(inode, cluster_size - 1);
ret = get_data_block(inode, start_blk, &map_bh, 0,
F2FS_GET_BLOCK_FIEMAP, &next_pgofs);
if (ret)
@ -1885,7 +1909,7 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
start_blk = next_pgofs;
if (blk_to_logical(inode, start_blk) < blk_to_logical(inode,
F2FS_I_SB(inode)->max_file_blocks))
max_inode_blocks(inode)))
goto prep_next;
flags |= FIEMAP_EXTENT_LAST;
@ -1897,11 +1921,38 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
ret = fiemap_fill_next_extent(fieinfo, logical,
phys, size, flags);
if (ret)
goto out;
size = 0;
}
if (start_blk > last_blk || ret)
if (start_blk > last_blk)
goto out;
if (compr_cluster) {
compr_cluster = false;
logical = blk_to_logical(inode, start_blk - 1);
phys = blk_to_logical(inode, map_bh.b_blocknr);
size = blk_to_logical(inode, cluster_size);
flags |= FIEMAP_EXTENT_ENCODED;
start_blk += cluster_size - 1;
if (start_blk > last_blk)
goto out;
goto prep_next;
}
if (map_bh.b_blocknr == COMPRESS_ADDR) {
compr_cluster = true;
start_blk++;
goto prep_next;
}
logical = blk_to_logical(inode, start_blk);
phys = blk_to_logical(inode, map_bh.b_blocknr);
size = map_bh.b_size;