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Filipe reported a problem where generic/619 was failing with an ENOSPC abort while running delayed refs, like the following BTRFS: Transaction aborted (error -28) WARNING: CPU: 3 PID: 522920 at fs/btrfs/free-space-tree.c:1049 add_to_free_space_tree+0xe5/0x110 [btrfs] CPU: 3 PID: 522920 Comm: kworker/u16:19 Tainted: G W 5.16.0-rc2-btrfs-next-106 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Workqueue: events_unbound btrfs_async_reclaim_metadata_space [btrfs] RIP: 0010:add_to_free_space_tree+0xe5/0x110 [btrfs] RSP: 0000:ffffa65087fb7b20 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000001000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff9131eeaa RDI: 00000000ffffffff RBP: ffff8d62e26481b8 R08: ffffffff9ad97ce0 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: 00000000ffffffe4 R13: ffff8d61c25fe688 R14: ffff8d61ebd88800 R15: ffff8d61ebd88a90 FS: 0000000000000000(0000) GS:ffff8d64ed400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa46a8b1000 CR3: 0000000148d18003 CR4: 0000000000370ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __btrfs_free_extent+0x516/0x950 [btrfs] __btrfs_run_delayed_refs+0x2b1/0x1250 [btrfs] btrfs_run_delayed_refs+0x86/0x210 [btrfs] flush_space+0x403/0x630 [btrfs] ? call_rcu_tasks_generic+0x50/0x80 ? lock_release+0x223/0x4a0 ? btrfs_get_alloc_profile+0xb5/0x290 [btrfs] ? do_raw_spin_unlock+0x4b/0xa0 btrfs_async_reclaim_metadata_space+0x139/0x320 [btrfs] process_one_work+0x24c/0x5b0 worker_thread+0x55/0x3c0 ? process_one_work+0x5b0/0x5b0 kthread+0x17c/0x1a0 ? set_kthread_struct+0x40/0x40 ret_from_fork+0x22/0x30 There's a couple of reasons for this, but in generic/619's case the largest reason is because it is a very small file system, ad we do not reserve enough space for the global reserve. With the free space tree we now have the free space tree that we need to modify when running delayed refs. This means we need the global reserve to take this into account when it calculates the minimum size it needs to be. This is especially important for very small file systems. Fix this by adjusting the minimum global block rsv size math to include the size of the free space tree when calculating the size. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: David Sterba <dsterba@suse.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.