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Message-ID: <20200330091329.46357-1-yuchao0@huawei.com>
Date: Mon, 30 Mar 2020 17:13:29 +0800
From: Chao Yu <yuchao0@...wei.com>
To: <jaegeuk@...nel.org>
CC: <linux-f2fs-devel@...ts.sourceforge.net>,
<linux-kernel@...r.kernel.org>, <chao@...nel.org>,
Chao Yu <yuchao0@...wei.com>
Subject: [PATCH v3] f2fs: introduce f2fs_bmap_compress()
to support bmap() on compressed inode: if queried block locates in
non-compressed cluster, return its physical block address.
Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
v3:
- use round_down instead of rounddown to avoid compile error.
fs/f2fs/data.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 24643680489b..2fcd70fd2cbb 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -3585,6 +3585,37 @@ static int f2fs_set_data_page_dirty(struct page *page)
return 0;
}
+
+static sector_t f2fs_bmap_compress(struct inode *inode, sector_t block)
+{
+#ifdef CONFIG_F2FS_FS_COMPRESSION
+ struct dnode_of_data dn;
+ sector_t start_idx, blknr = 0;
+ int ret;
+
+ start_idx = round_down(block, F2FS_I(inode)->i_cluster_size);
+
+ set_new_dnode(&dn, inode, NULL, NULL, 0);
+ ret = f2fs_get_dnode_of_data(&dn, start_idx, LOOKUP_NODE);
+ if (ret)
+ return 0;
+
+ if (dn.data_blkaddr != COMPRESS_ADDR) {
+ dn.ofs_in_node += block - start_idx;
+ blknr = f2fs_data_blkaddr(&dn);
+ if (!__is_valid_data_blkaddr(blknr))
+ blknr = 0;
+ }
+
+ f2fs_put_dnode(&dn);
+
+ return blknr;
+#else
+ return -EOPNOTSUPP;
+#endif
+}
+
+
static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
{
struct inode *inode = mapping->host;
@@ -3596,6 +3627,9 @@ static sector_t f2fs_bmap(struct address_space *mapping, sector_t block)
if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
filemap_write_and_wait(mapping);
+ if (f2fs_compressed_file(inode))
+ return f2fs_bmap_compress(inode, block);
+
return generic_block_bmap(mapping, block, get_data_block_bmap);
}
--
2.18.0.rc1
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