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xfs: add blockdev name to kthreads

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This allows to see in `ps` and similar tools which kthreads are
allotted to which block device/filesystem, similar to what jbd2
does. As the process name is a fixed 16-char array, no extra
space is needed in tasks.

  PID TTY      STAT   TIME COMMAND
    2 ?        S      0:00 [kthreadd]
  197 ?        S      0:00  \_ [jbd2/sda2-8]
  198 ?        S      0:00  \_ [ext4-dio-unwrit]
  204 ?        S      0:00  \_ [flush-8:0]
 2647 ?        S      0:00  \_ [xfs_mru_cache]
 2648 ?        S      0:00  \_ [xfslogd/0]
 2649 ?        S      0:00  \_ [xfsdatad/0]
 2650 ?        S      0:00  \_ [xfsconvertd/0]
 2651 ?        S      0:00  \_ [xfsbufd/ram0]
 2652 ?        S      0:00  \_ [xfsaild/ram0]
 2653 ?        S      0:00  \_ [xfssyncd/ram0]

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Jan Engelhardt
2010-03-23 09:52:55 +11:00
committed by Alex Elder
parent fda168c245
commit e2a07812e9
4 changed files with 13 additions and 10 deletions
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10
fs/xfs/linux-2.6/xfs_buf.c
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@@ -1614,7 +1614,8 @@ xfs_mapping_buftarg(
STATIC int
xfs_alloc_delwrite_queue(
xfs_buftarg_t *btp)
xfs_buftarg_t *btp,
const char *fsname)
{
int error = 0;
@@ -1622,7 +1623,7 @@ xfs_alloc_delwrite_queue(
INIT_LIST_HEAD(&btp->bt_delwrite_queue);
spin_lock_init(&btp->bt_delwrite_lock);
btp->bt_flags = 0;
btp->bt_task = kthread_run(xfsbufd, btp, "xfsbufd");
btp->bt_task = kthread_run(xfsbufd, btp, "xfsbufd/%s", fsname);
if (IS_ERR(btp->bt_task)) {
error = PTR_ERR(btp->bt_task);
goto out_error;
@@ -1635,7 +1636,8 @@ out_error:
xfs_buftarg_t *
xfs_alloc_buftarg(
struct block_device *bdev,
int external)
int external,
const char *fsname)
{
xfs_buftarg_t *btp;
@@ -1647,7 +1649,7 @@ xfs_alloc_buftarg(
goto error;
if (xfs_mapping_buftarg(btp, bdev))
goto error;
if (xfs_alloc_delwrite_queue(btp))
if (xfs_alloc_delwrite_queue(btp, fsname))
goto error;
xfs_alloc_bufhash(btp, external);
return btp;