| Message ID | 20200330164842.12391-1-marek.behun@nic.cz |
|---|---|
| State | Accepted |
| Commit | 48180e15d3eaff51b1da30a90bc64b7acba8fb51 |
| Delegated to: | Tom Rini |
| Headers | show |
| Series | [v2] fs: btrfs: support sparse extents | expand |
On Mon, Mar 30, 2020 at 06:48:42PM +0200, Marek Behún wrote: > When logical address of a regular extent is 0, the extent is sparse and > consists of all zeros. > > Without this when sparse extents are used in a file reading fails with > Cannot map logical address 0 to physical > > Signed-off-by: Marek Behún <marek.behun@nic.cz> Applied to u-boot/master, thanks!
diff --git a/fs/btrfs/extent-io.c b/fs/btrfs/extent-io.c index 66d0e1c7d6..2e4599cf64 100644 --- a/fs/btrfs/extent-io.c +++ b/fs/btrfs/extent-io.c @@ -78,6 +78,12 @@ u64 btrfs_read_extent_reg(struct btrfs_path *path, if (size > dlen - offset) size = dlen - offset; + /* sparse extent */ + if (extent->disk_bytenr == 0) { + memset(out, 0, size); + return size; + } + physical = btrfs_map_logical_to_physical(extent->disk_bytenr); if (physical == -1ULL) return -1ULL;
When logical address of a regular extent is 0, the extent is sparse and consists of all zeros. Without this when sparse extents are used in a file reading fails with Cannot map logical address 0 to physical Signed-off-by: Marek Behún <marek.behun@nic.cz> --- fs/btrfs/extent-io.c | 6 ++++++ 1 file changed, 6 insertions(+)