diff options
| author | Qu Wenruo <wqu@suse.com> | 2020-06-24 18:03:09 +0200 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2020-09-07 20:57:27 -0400 |
| commit | a26a6bedafcf3ddacb90ec4353306c2f8a5e36dc (patch) | |
| tree | 439039164adcd623683276767e05539dbce623ad /fs/btrfs/disk-io.c | |
| parent | 0cc8fc65c15efde484f7f6a7444ef94ce86c13b1 (diff) | |
fs: btrfs: Introduce btrfs_read_extent_inline() and btrfs_read_extent_reg()
These two functions are used to do sector aligned read, which will be
later used to implement btrfs_file_read().
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Diffstat (limited to 'fs/btrfs/disk-io.c')
| -rw-r--r-- | fs/btrfs/disk-io.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 4d08b0204a..4da1b80038 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -565,6 +565,42 @@ struct extent_buffer* read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr, return ERR_PTR(ret); } +int read_extent_data(struct btrfs_fs_info *fs_info, char *data, u64 logical, + u64 *len, int mirror) +{ + u64 offset = 0; + struct btrfs_multi_bio *multi = NULL; + struct btrfs_device *device; + int ret = 0; + u64 max_len = *len; + + ret = btrfs_map_block(fs_info, READ, logical, len, &multi, mirror, + NULL); + if (ret) { + fprintf(stderr, "Couldn't map the block %llu\n", + logical + offset); + goto err; + } + device = multi->stripes[0].dev; + + if (*len > max_len) + *len = max_len; + if (!device->desc || !device->part) { + ret = -EIO; + goto err; + } + + ret = __btrfs_devread(device->desc, device->part, data, *len, + multi->stripes[0].physical); + if (ret != *len) + ret = -EIO; + else + ret = 0; +err: + kfree(multi); + return ret; +} + void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info, u64 objectid) { |