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| author |   Naohiro Aota <naohiro.aota@wdc.com> | 2019-06-06 16:54:44 +0900 |
|---|---|---|
| committer |   David Sterba <dsterba@suse.com> | 2019-06-14 17:33:46 +0200 |
| commit | c4e0540d0ad49c8ceab06cceed1de27c4fe29f6e (patch) | |
| tree | 8bf74f88f9e626c508832e3977c6d3c9269948cf /fs/btrfs/reada.c | |
| parent | Btrfs: fix race between block group removal and block group allocation (diff) | |
| download | linux-dev-c4e0540d0ad49c8ceab06cceed1de27c4fe29f6e.tar.xz linux-dev-c4e0540d0ad49c8ceab06cceed1de27c4fe29f6e.zip | |
btrfs: start readahead also in seed devices
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>
Diffstat (limited to 'fs/btrfs/reada.c')
| -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 10d9589001a9..bb5bd49573b4 100644 --- a/fs/btrfs/reada.c +++ b/fs/btrfs/reada.c @@ -747,6 +747,7 @@ 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); @@ -758,6 +759,10 @@ 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; |