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libzfs: Fix mounting datasets under thread limit pressure

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During parallel zpool import, /sbin/zpool will create a separate thread
pool for each pool, used to mount that pool's datasets.  If the total
thread count exceed's the system's limit on threads per process, then
tpool_dispatch may fail.  If it does, directly execute the mount
operation instead.

Sponsored by: Axcient
Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: George Wilson <[email protected]>
Signed-off-by: Alan Somers <[email protected]>
Closes #16178
Fixes #16172
This commit is contained in:
Alan Somers authored and Brian Behlendorf committed 2024-05-14 09:36:14 -07:00
1 parent f625d038d2
commit eced2e2f1e
1 file changed
+4 -1
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lib/libzfs/libzfs_mount.c
+4 -1
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@@ -1098,7 +1098,10 @@ zfs_dispatch_mount(libzfs_handle_t *hdl, zfs_handle_t **handles,
mnt_param->mnt_func = func;
mnt_param->mnt_data = data;
(void) tpool_dispatch(tp, zfs_mount_task, (void*)mnt_param);
if (tpool_dispatch(tp, zfs_mount_task, (void*)mnt_param)) {
/* Could not dispatch to thread pool; execute directly */
zfs_mount_task((void*)mnt_param);
}
}
/*