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files: Formalize fd restore priorities

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There are places when we have to select which fd to ->open
and which to ->receive. To avoid deadlocks we sort them in
an ascending order on { pid, fd } pair.

Make this idea more formal by introducing an explicit function
doing this check and call it where appropriate (pipe.c master
selection is also simplified to fit new ... API).

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov
2012-09-14 22:09:22 +04:00
parent a0560c4298
commit 8fc6dbfadd
4 changed files with 13 additions and 14 deletions
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6
include/files.h
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@@ -43,6 +43,12 @@ struct fdinfo_list_entry {
FdinfoEntry *fe;
};
/* reports whether fd_a takes prio over fd_b */
static inline int fdinfo_rst_prio(struct fdinfo_list_entry *fd_a, struct fdinfo_list_entry *fd_b)
{
return (fd_a->pid < fd_b->pid) || ((fd_a->pid == fd_b->pid) && (fd_a->fe->fd < fd_b->fe->fd));
}
struct file_desc_ops {
unsigned int type;
int (*open)(struct file_desc *d);