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authorAlexey Dobriyan <adobriyan@gmail.com>2008-08-13 02:09:02 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-08-13 03:07:30 +0400
commit50ac2d694f2dd1658341cf97bcf2ffb836d772cb (patch)
treec4466ecb7c5211ee9423380783f00027411d5d5a /fs/seq_file.c
parentdd763460eb628b57814251a15a39f8d75c044d76 (diff)
downloadlinux-50ac2d694f2dd1658341cf97bcf2ffb836d772cb.tar.xz
seq_file: add seq_cpumask(), seq_nodemask()
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>
Diffstat (limited to 'fs/seq_file.c')
-rw-r--r--fs/seq_file.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 3f54dbd6c49b..5d54205e486b 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -443,6 +443,20 @@ int seq_dentry(struct seq_file *m, struct dentry *dentry, char *esc)
return -1;
}
+int seq_bitmap(struct seq_file *m, unsigned long *bits, unsigned int nr_bits)
+{
+ size_t len = bitmap_scnprintf_len(nr_bits);
+
+ if (m->count + len < m->size) {
+ bitmap_scnprintf(m->buf + m->count, m->size - m->count,
+ bits, nr_bits);
+ m->count += len;
+ return 0;
+ }
+ m->count = m->size;
+ return -1;
+}
+
static void *single_start(struct seq_file *p, loff_t *pos)
{
return NULL + (*pos == 0);