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authorGao Xiang <hsiangkao@linux.alibaba.com>2021-08-13 08:29:31 +0300
committerGao Xiang <hsiangkao@linux.alibaba.com>2021-08-18 19:13:43 +0300
commiteadcd6b5a1eb39866ab8d8a3e4f2e51bc51a2350 (patch)
tree6675343c98541503c6fbfd91d8ced4cec1ead430 /fs/erofs/zmap.c
parentd95ae5e25326092d61613acf98280270dde22778 (diff)
downloadlinux-eadcd6b5a1eb39866ab8d8a3e4f2e51bc51a2350.tar.xz
erofs: add fiemap support with iomap
This adds fiemap support for both uncompressed files and compressed files by using iomap infrastructure. Link: https://lore.kernel.org/r/20210813052931.203280-3-hsiangkao@linux.alibaba.com Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Diffstat (limited to 'fs/erofs/zmap.c')
-rw-r--r--fs/erofs/zmap.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/fs/erofs/zmap.c b/fs/erofs/zmap.c
index c2a31810abeb..9fb98d85a3ce 100644
--- a/fs/erofs/zmap.c
+++ b/fs/erofs/zmap.c
@@ -675,3 +675,41 @@ out:
DBG_BUGON(err < 0 && err != -ENOMEM);
return err;
}
+
+static int z_erofs_iomap_begin_report(struct inode *inode, loff_t offset,
+ loff_t length, unsigned int flags,
+ struct iomap *iomap, struct iomap *srcmap)
+{
+ int ret;
+ struct erofs_map_blocks map = { .m_la = offset };
+
+ ret = z_erofs_map_blocks_iter(inode, &map, EROFS_GET_BLOCKS_FIEMAP);
+ if (map.mpage)
+ put_page(map.mpage);
+ if (ret < 0)
+ return ret;
+
+ iomap->bdev = inode->i_sb->s_bdev;
+ iomap->offset = map.m_la;
+ iomap->length = map.m_llen;
+ if (map.m_flags & EROFS_MAP_MAPPED) {
+ iomap->type = IOMAP_MAPPED;
+ iomap->addr = map.m_pa;
+ } else {
+ iomap->type = IOMAP_HOLE;
+ iomap->addr = IOMAP_NULL_ADDR;
+ /*
+ * No strict rule how to describe extents for post EOF, yet
+ * we need do like below. Otherwise, iomap itself will get
+ * into an endless loop on post EOF.
+ */
+ if (iomap->offset >= inode->i_size)
+ iomap->length = length + map.m_la - offset;
+ }
+ iomap->flags = 0;
+ return 0;
+}
+
+const struct iomap_ops z_erofs_iomap_report_ops = {
+ .iomap_begin = z_erofs_iomap_begin_report,
+};