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author | Tom Zanussi <zanussi@us.ibm.com> | 2006-01-08 01:02:29 -0800 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-08 20:13:50 -0800 |
commit | 03d78d11d92b5ed688bb18167b05d9d01493e175 (patch) | |
tree | b3d87f9e817bc59d66cdfd60bb1ef68b9b4b22b2 | |
parent | 08c541a7ade230883c48225f4ea406a0117e7c2f (diff) | |
download | linux-03d78d11d92b5ed688bb18167b05d9d01493e175.tar.gz linux-03d78d11d92b5ed688bb18167b05d9d01493e175.tar.bz2 linux-03d78d11d92b5ed688bb18167b05d9d01493e175.zip |
[PATCH] relayfs: add Documentation on relay files in other filesystems
Documentation update for creating relay files in other filesystems.
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>
-rw-r--r-- | Documentation/filesystems/relayfs.txt | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/Documentation/filesystems/relayfs.txt b/Documentation/filesystems/relayfs.txt index 0720a049d0b8..4221b3a52e25 100644 --- a/Documentation/filesystems/relayfs.txt +++ b/Documentation/filesystems/relayfs.txt @@ -143,6 +143,8 @@ Here's a summary of the API relayfs provides to in-kernel clients: subbuf_start(buf, subbuf, prev_subbuf, prev_padding) buf_mapped(buf, filp) buf_unmapped(buf, filp) + create_buf_file(filename, parent, mode, buf) + remove_buf_file(dentry) helper functions: @@ -343,6 +345,31 @@ completely defined by the caller. See the relay-apps tarball at http://relayfs.sourceforge.net for examples of how these non-relay files are meant to be used. +Creating relay files in other filesystems +----------------------------------------- + +By default of course, relay_open() creates relay files in the relayfs +filesystem. Because relay_file_operations is exported, however, it's +also possible to create and use relay files in other pseudo-filesytems +such as debugfs. + +For this purpose, two callback functions are provided, +create_buf_file() and remove_buf_file(). create_buf_file() is called +once for each per-cpu buffer from relay_open() to allow the client to +create a file to be used to represent the corresponding buffer; if +this callback is not defined, the default implementation will create +and return a file in the relayfs filesystem to represent the buffer. +The callback should return the dentry of the file created to represent +the relay buffer. Note that the parent directory passed to +relay_open() (and passed along to the callback), if specified, must +exist in the same filesystem the new relay file is created in. If +create_buf_file() is defined, remove_buf_file() must also be defined; +it's responsible for deleting the file(s) created in create_buf_file() +and is called during relay_close(). + +See the 'exported-relayfile' examples in the relay-apps tarball for +examples of creating and using relay files in debugfs. + Misc ---- |