path: root/fs/seq_file.c
diff options
authorYann Droneaud <ydroneaud@opteya.com>2015-06-30 14:57:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-06-30 19:44:57 -0700
commit460b865e53c347ebf110e50d499718cd9b39d810 (patch)
treefe8871e9c28acbad496efca46c87b9366c703267 /fs/seq_file.c
parent189f9841de23a58ecb4b2602db8581512ff08ba4 (diff)
fs: document seq_open()'s usage of file->private_data
seq_open() stores its struct seq_file in file->private_data, thus it must not be modified by user of seq_file. Link: http://lkml.kernel.org/r/cover.1433193673.git.ydroneaud@opteya.com Signed-off-by: Yann Droneaud <ydroneaud@opteya.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')
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 5f163c6c821c..760e25dad985 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -48,6 +48,8 @@ static void *seq_buf_alloc(unsigned long size)
* ERR_PTR(error). In the end of sequence they return %NULL. ->show()
* returns 0 in case of success and negative number in case of error.
* Returning SEQ_SKIP means "discard this element and move on".
+ * Note: seq_open() will allocate a struct seq_file and store its
+ * pointer in @file->private_data. This pointer should not be modified.
int seq_open(struct file *file, const struct seq_operations *op)

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