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| author | Tom Zanussi <zanussi@us.ibm.com> | 2006-01-08 01:02:29 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-08 20:13:50 -0800 |
| commit | e6c08367b8fc6dce6dfd1106f53f6ef28215b313 (patch) | |
| tree | fa5bb7071fdcd61d3296e5d0be224d864cb1d166 /include/linux | |
| parent | 03d78d11d92b5ed688bb18167b05d9d01493e175 (diff) | |
| download | linux-e6c08367b8fc6dce6dfd1106f53f6ef28215b313.tar.gz linux-e6c08367b8fc6dce6dfd1106f53f6ef28215b313.tar.bz2 linux-e6c08367b8fc6dce6dfd1106f53f6ef28215b313.zip | |
[PATCH] relayfs: add support for global relay buffers
This patch adds the optional is_global outparam to the create_buf_file()
callback. This can be used by clients to create a single global relayfs
buffer instead of the default per-cpu buffers. This was suggested as being
useful for certain debugging applications where it's more convenient to be
able to get all the data from a single channel without having to go to the
bother of dealing with per-cpu files.
Signed-off-by: Tom Zanussi <zanussi@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/relayfs_fs.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/relayfs_fs.h b/include/linux/relayfs_fs.h index 8c2177105857..30f45511b40d 100644 --- a/include/linux/relayfs_fs.h +++ b/include/linux/relayfs_fs.h @@ -116,6 +116,7 @@ struct rchan_callbacks * @parent: the parent of the file to create * @mode: the mode of the file to create * @buf: the channel buffer + * @is_global: outparam - set non-zero if the buffer should be global * * Called during relay_open(), once for each per-cpu buffer, * to allow the client to create a file to be used to @@ -126,12 +127,17 @@ struct rchan_callbacks * The callback should return the dentry of the file created * to represent the relay buffer. * + * Setting the is_global outparam to a non-zero value will + * cause relay_open() to create a single global buffer rather + * than the default set of per-cpu buffers. + * * See Documentation/filesystems/relayfs.txt for more info. */ struct dentry *(*create_buf_file)(const char *filename, struct dentry *parent, int mode, - struct rchan_buf *buf); + struct rchan_buf *buf, + int *is_global); /* * remove_buf_file - remove file representing a relayfs channel buffer |