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| author | Chao Yu <yuchao0@huawei.com> | 2019-07-16 17:32:56 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-07-22 07:34:15 +0200 |
| commit | 9da681e017a36a411f70ca1ff68c499a30d2039d (patch) | |
| tree | ecbb08798d8ff92f960cb63dd246a59a33eaed00 | |
| parent | 441dfcc8861ed9cbc778c655f85e5ce5db08035e (diff) | |
| download | linux-9da681e017a36a411f70ca1ff68c499a30d2039d.tar.bz2 | |
staging: erofs: support bmap
Add erofs_bmap() to support FIBMAP ioctl on flatmode inode.
Reviewed-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Link: https://lore.kernel.org/r/20190716093256.108791-1-yuchao0@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/staging/erofs/data.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/staging/erofs/data.c b/drivers/staging/erofs/data.c index cc31c3e5984c..f73e4720cd3e 100644 --- a/drivers/staging/erofs/data.c +++ b/drivers/staging/erofs/data.c @@ -392,9 +392,42 @@ static int erofs_raw_access_readpages(struct file *filp, return 0; } +static int erofs_get_block(struct inode *inode, sector_t iblock, + struct buffer_head *bh, int create) +{ + struct erofs_map_blocks map = { + .m_la = iblock << 9, + }; + int err; + + err = erofs_map_blocks(inode, &map, EROFS_GET_BLOCKS_RAW); + if (err) + return err; + + if (map.m_flags & EROFS_MAP_MAPPED) + bh->b_blocknr = erofs_blknr(map.m_pa); + + return err; +} + +static sector_t erofs_bmap(struct address_space *mapping, sector_t block) +{ + struct inode *inode = mapping->host; + + if (is_inode_flat_inline(inode)) { + erofs_blk_t blks = i_size_read(inode) >> LOG_BLOCK_SIZE; + + if (block >> LOG_SECTORS_PER_BLOCK >= blks) + return 0; + } + + return generic_block_bmap(mapping, block, erofs_get_block); +} + /* for uncompressed (aligned) files and raw access for other files */ const struct address_space_operations erofs_raw_access_aops = { .readpage = erofs_raw_access_readpage, .readpages = erofs_raw_access_readpages, + .bmap = erofs_bmap, }; |