diff options
| author | Naohiro Aota <naohiro.aota@wdc.com> | 2019-06-06 16:54:44 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-25 11:36:53 +0800 |
| commit | 1eb2215413e601cb7a745ddfc10a0ae68a0de91a (patch) | |
| tree | 16a8c612017f847a18df74096ab1b6e6884458ca /fs | |
| parent | 74c0cf1368ef8ffcb1cd80128108042edcc2a123 (diff) | |
btrfs: start readahead also in seed devices
commit c4e0540d0ad49c8ceab06cceed1de27c4fe29f6e upstream.
Currently, btrfs does not consult seed devices to start readahead. As a
result, if readahead zone is added to the seed devices, btrfs_reada_wait()
indefinitely wait for the reada_ctl to finish.
You can reproduce the hung by modifying btrfs/163 to have larger initial
file size (e.g. xfs_io pwrite 4M instead of current 256K).
Fixes: 7414a03fbf9e ("btrfs: initial readahead code and prototypes")
Cc: stable@vger.kernel.org # 3.2+: ce7791ffee1e: Btrfs: fix race between readahead and device replace/removal
Cc: stable@vger.kernel.org # 3.2+
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/reada.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c index ab852b8e3e37..3a4e15b39cc1 100644 --- a/fs/btrfs/reada.c +++ b/fs/btrfs/reada.c @@ -759,6 +759,7 @@ static void __reada_start_machine(struct btrfs_fs_info *fs_info) u64 total = 0; int i; +again: do { enqueued = 0; mutex_lock(&fs_devices->device_list_mutex); @@ -770,6 +771,10 @@ static void __reada_start_machine(struct btrfs_fs_info *fs_info) mutex_unlock(&fs_devices->device_list_mutex); total += enqueued; } while (enqueued && total < 10000); + if (fs_devices->seed) { + fs_devices = fs_devices->seed; + goto again; + } if (enqueued == 0) return; |