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author | Gao Xiang <hsiangkao@linux.alibaba.com> | 2021-08-13 13:29:31 +0800 |
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committer | Gao Xiang <hsiangkao@linux.alibaba.com> | 2021-08-19 00:13:43 +0800 |
commit | eadcd6b5a1eb39866ab8d8a3e4f2e51bc51a2350 (patch) | |
tree | 6675343c98541503c6fbfd91d8ced4cec1ead430 /fs/erofs/zmap.c | |
parent | d95ae5e25326092d61613acf98280270dde22778 (diff) | |
download | linux-eadcd6b5a1eb39866ab8d8a3e4f2e51bc51a2350.tar.bz2 |
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.c | 38 |
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, +}; |