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jail: Make comments on struct prison locking more precise

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This commit is contained in:
Jamie Gritton 2020-12-26 17:01:16 -08:00
parent 93900fc697
commit 43c2734895
1 changed files with 5 additions and 3 deletions
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8
sys/sys/jail.h
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@ -150,15 +150,17 @@ struct prison_racct;
* *
* Lock key: * Lock key:
* (a) allprison_lock * (a) allprison_lock
* (p) locked by pr_mtx * (m) locked by pr_mtx
* (p) locked by pr_mtx, and also at least shared allprison_lock required
* to update
* (c) set only during creation before the structure is shared, no mutex * (c) set only during creation before the structure is shared, no mutex
* required to read * required to read
*/ */
struct prison { struct prison {
TAILQ_ENTRY(prison) pr_list; /* (a) all prisons */ TAILQ_ENTRY(prison) pr_list; /* (a) all prisons */
int pr_id; /* (c) prison id */ int pr_id; /* (c) prison id */
int pr_ref; /* (p) refcount */ int pr_ref; /* (m) refcount */
int pr_uref; /* (p) user (alive) refcount */ int pr_uref; /* (m) user (alive) refcount */
unsigned pr_flags; /* (p) PR_* flags */ unsigned pr_flags; /* (p) PR_* flags */
LIST_HEAD(, prison) pr_children; /* (a) list of child jails */ LIST_HEAD(, prison) pr_children; /* (a) list of child jails */
LIST_ENTRY(prison) pr_sibling; /* (a) next in parent's list */ LIST_ENTRY(prison) pr_sibling; /* (a) next in parent's list */