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seq_file: add seq_cpumask(), seq_nodemask()

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Short enough reads from /proc/irq/*/smp_affinity return -EINVAL for no
good reason.

This became noticed with NR_CPUS=4096 patches, when length of printed
representation of cpumask becase 1152, but cat(1) continued to read with
1024-byte chunks.  bitmap_scnprintf() in good faith fills buffer, returns
1023, check returns -EINVAL.

Fix it by switching to seq_file, so handler will just fill buffer and
doesn't care about offsets, length, filling EOF and all this crap.

For that add seq_bitmap(), and wrappers around it -- seq_cpumask() and
seq_nodemask().

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Paul Jackson <pj@sgi.com>
Cc: Mike Travis <travis@sgi.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2008-08-12 15:09:02 -07:00 • committed by Linus Torvalds
parent dd763460eb
commit 50ac2d694f
4 changed files with 38 additions and 0 deletions
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12
include/linux/seq_file.h
View file

@ -4,6 +4,8 @@
#include <linux/types.h>
#include <linux/string.h>
#include <linux/mutex.h>
#include <linux/cpumask.h>
#include <linux/nodemask.h>
struct seq_operations;
struct file;
@ -47,6 +49,16 @@ int seq_path(struct seq_file *, struct path *, char *);
int seq_dentry(struct seq_file *, struct dentry *, char *);
int seq_path_root(struct seq_file *m, struct path *path, struct path *root,
char *esc);
int seq_bitmap(struct seq_file *m, unsigned long *bits, unsigned int nr_bits);
static inline int seq_cpumask(struct seq_file *m, cpumask_t *mask)
{
return seq_bitmap(m, mask->bits, NR_CPUS);
}
static inline int seq_nodemask(struct seq_file *m, nodemask_t *mask)
{
return seq_bitmap(m, mask->bits, MAX_NUMNODES);
}
int single_open(struct file *, int (*)(struct seq_file *, void *), void *);
int single_release(struct inode *, struct file *);