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>
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@ -48,6 +48,8 @@ static void *seq_buf_alloc(unsigned long size)
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* ERR_PTR(error). In the end of sequence they return %NULL. ->show()
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* returns 0 in case of success and negative number in case of error.
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* Returning SEQ_SKIP means "discard this element and move on".
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* Note: seq_open() will allocate a struct seq_file and store its
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* pointer in @file->private_data. This pointer should not be modified.
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*/
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int seq_open(struct file *file, const struct seq_operations *op)
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{
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