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afs: Add tracing for cell refcount and active user count

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Add a tracepoint to log the cell refcount and active user count and pass in
a reason code through various functions that manipulate these counters.

Additionally, a helper function, afs_see_cell(), is provided to log
interesting places that deal with a cell without actually doing any
accounting directly.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2020-10-13 20:51:59 +01:00
parent 1d0e850a49
commit dca54a7bbb
10 changed files with 208 additions and 55 deletions
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15
fs/afs/internal.h
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@@ -375,6 +375,7 @@ struct afs_cell {
enum dns_record_source dns_source:8; /* Latest source of data from lookup */
enum dns_lookup_status dns_status:8; /* Latest status of data from lookup */
unsigned int dns_lookup_count; /* Counter of DNS lookups */
unsigned int debug_id;
/* The volumes belonging to this cell */
struct rb_root volumes; /* Tree of volumes on this server */
@@ -919,14 +920,16 @@ static inline bool afs_cb_is_broken(unsigned int cb_break,
* cell.c
*/
extern int afs_cell_init(struct afs_net *, const char *);
extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned);
extern struct afs_cell *afs_find_cell(struct afs_net *, const char *, unsigned,
enum afs_cell_trace);
extern struct afs_cell *afs_lookup_cell(struct afs_net *, const char *, unsigned,
const char *, bool);
extern struct afs_cell *afs_use_cell(struct afs_cell *);
extern void afs_unuse_cell(struct afs_net *, struct afs_cell *);
extern struct afs_cell *afs_get_cell(struct afs_cell *);
extern void afs_put_cell(struct afs_cell *);
extern void afs_queue_cell(struct afs_cell *);
extern struct afs_cell *afs_use_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_unuse_cell(struct afs_net *, struct afs_cell *, enum afs_cell_trace);
extern struct afs_cell *afs_get_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_see_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_put_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_queue_cell(struct afs_cell *, enum afs_cell_trace);
extern void afs_manage_cells(struct work_struct *);
extern void afs_cells_timer(struct timer_list *);
extern void __net_exit afs_cell_purge(struct afs_net *);