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authorAl Viro <viro@zeniv.linux.org.uk>2005-11-07 17:15:34 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-07 18:18:09 -0800
commit1abe77b0fc4b485927f1f798ae81a752677e1d05 (patch)
treef7a2de3728fa475975144310e67b643c446e5a6f /fs/seq_file.c
parentccd48bc7fac284caf704dcdcafd223a24f70bccf (diff)
downloadlwn-1abe77b0fc4b485927f1f798ae81a752677e1d05.tar.gz
lwn-1abe77b0fc4b485927f1f798ae81a752677e1d05.zip
[PATCH] allow callers of seq_open do allocation themselves
Allow caller of seq_open() to kmalloc() seq_file + whatever else they want and set ->private_data to it. seq_open() will then abstain from doing allocation itself. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/seq_file.c')
-rw-r--r--fs/seq_file.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 38ef913767ff..7c40570b71dc 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -28,13 +28,17 @@
*/
int seq_open(struct file *file, struct seq_operations *op)
{
- struct seq_file *p = kmalloc(sizeof(*p), GFP_KERNEL);
- if (!p)
- return -ENOMEM;
+ struct seq_file *p = file->private_data;
+
+ if (!p) {
+ p = kmalloc(sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+ file->private_data = p;
+ }
memset(p, 0, sizeof(*p));
sema_init(&p->sem, 1);
p->op = op;
- file->private_data = p;
/*
* Wrappers around seq_open(e.g. swaps_open) need to be