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fs: document seq_open()'s usage of file->private_data

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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>
This commit is contained in:
Yann Droneaud
2015-06-30 14:57:36 -07:00
committed by Linus Torvalds
parent 189f9841de
commit 460b865e53
1 changed files with 2 additions and 0 deletions
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2
fs/seq_file.c
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@@ -48,6 +48,8 @@ static void *seq_buf_alloc(unsigned long size)
* ERR_PTR(error). In the end of sequence they return %NULL. ->show() * 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. * returns 0 in case of success and negative number in case of error.
* Returning SEQ_SKIP means "discard this element and move on". * 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) int seq_open(struct file *file, const struct seq_operations *op)
{ {