No more seq_file pre-allocation

Hi,

Please find a revised patchset to remove support for passing pre-allocated struct seq_file to seq_open().

Such feature is undocumented and prone to error.

In particular, if seq_release() is used in release handler, it will kfree() a pointer which was not allocated by seq_open().

So, please find a patchset that drop the support for pre-allocated struct seq_file: it's only of use in proc_namespace.c and can be easily replaced by using seq_open_private()/seq_release_private().

Additionally, it documents the use of file->private_data to hold pointer to struct seq_file by seq_open().

Changes from v0 [0]:
- convert kmalloc() + memset() to kzalloc()
- revised a bit commit messages

[0] [PATCH 0/3] seq_file allocation in seq_open()

http://lkml.kernel.org/r/[email protected]
http://lkml.kernel.org/g/[email protected]

Yann Droneaud (3):
fs: use seq_open_private() for proc_mounts
fs: allocate structure unconditionally in seq_open()
fs: documents seq_open()'s usage of file->private_data

 fs/mount.h          |  3 ---
 fs/namespace.c      |  6 +++---
 fs/proc_namespace.c | 34 ++++++++++++++++------------------
 fs/seq_file.c       | 19 +++++++++++--------
 4 files changed, 30 insertions(+), 32 deletions(-)

2.4.2