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authorAl Viro <viro@zeniv.linux.org.uk>2013-03-31 21:43:23 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2013-04-09 22:13:29 +0400
commit2043f495c7c1a06f7748b5bcd17656d93c95e1a6 (patch)
treef3d0368632a1fda88bb385ddfc01600fe450e74f /include/linux/seq_file.h
parent70ef457dc92bdd03c0c8d640fce45909166983a1 (diff)
downloadlinux-2043f495c7c1a06f7748b5bcd17656d93c95e1a6.tar.xz
new helper: single_open_size()
Same as single_open(), but preallocates the buffer of given size. Doesn't make any sense for sizes up to PAGE_SIZE and doesn't make sense if output of show() exceeds PAGE_SIZE only rarely - seq_read() will take care of growing the buffer and redoing show(). If you _know_ that it will be large, it might make more sense to look into saner iterator, rather than go with single-shot one. If that's impossible, single_open_size() might be for you. Again, don't use that without a good reason; occasionally that's really the best way to go, but very often there are better solutions. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/seq_file.h')
-rw-r--r--include/linux/seq_file.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h
index 68a04a343cad..2da29ac178fc 100644
--- a/include/linux/seq_file.h
+++ b/include/linux/seq_file.h
@@ -123,6 +123,7 @@ static inline int seq_nodemask_list(struct seq_file *m, nodemask_t *mask)
}
int single_open(struct file *, int (*)(struct seq_file *, void *), void *);
+int single_open_size(struct file *, int (*)(struct seq_file *, void *), void *, size_t);
int single_release(struct inode *, struct file *);
void *__seq_open_private(struct file *, const struct seq_operations *, int);
int seq_open_private(struct file *, const struct seq_operations *, int);