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| author | David Teigland <teigland@redhat.com> | 2012-06-14 12:17:32 -0500 |
|---|---|---|
| committer | David Teigland <teigland@redhat.com> | 2012-07-16 14:18:01 -0500 |
| commit | 05c32f47bfae74dabff05208957768078b53cc49 (patch) | |
| tree | 71034eba054f49723a0dac41f6bcd9d4f37eb2bc /fs/dlm/dlm_internal.h | |
| parent | 1d7c484eeb167fc374294e38ae402de4097c8611 (diff) | |
| download | linux-05c32f47bfae74dabff05208957768078b53cc49.tar.bz2 | |
dlm: fix race between remove and lookup
It was possible for a remove message on an old
rsb to be sent after a lookup message on a new
rsb, where the rsbs were for the same resource
name. This could lead to a missing directory
entry for the new rsb.
It is fixed by keeping a copy of the resource
name being removed until after the remove has
been sent. A lookup checks if this in-progress
remove matches the name it is looking up.
Signed-off-by: David Teigland <teigland@redhat.com>
Diffstat (limited to 'fs/dlm/dlm_internal.h')
| -rw-r--r-- | fs/dlm/dlm_internal.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h index a5f82d5b3946..9d3e485f88c8 100644 --- a/fs/dlm/dlm_internal.h +++ b/fs/dlm/dlm_internal.h @@ -498,6 +498,13 @@ struct rcom_lock { char rl_lvb[0]; }; +/* + * The max number of resources per rsbtbl bucket that shrink will attempt + * to remove in each iteration. + */ + +#define DLM_REMOVE_NAMES_MAX 8 + struct dlm_ls { struct list_head ls_list; /* list of lockspaces */ dlm_lockspace_t *ls_local_handle; @@ -531,6 +538,12 @@ struct dlm_ls { int ls_new_rsb_count; struct list_head ls_new_rsb; /* new rsb structs */ + spinlock_t ls_remove_spin; + char ls_remove_name[DLM_RESNAME_MAXLEN+1]; + char *ls_remove_names[DLM_REMOVE_NAMES_MAX]; + int ls_remove_len; + int ls_remove_lens[DLM_REMOVE_NAMES_MAX]; + struct list_head ls_nodes; /* current nodes in ls */ struct list_head ls_nodes_gone; /* dead node list, recovery */ int ls_num_nodes; /* number of nodes in ls */ |