linux/fs
Tom Zanussi e82894f84d [PATCH] relayfs
Here's the latest version of relayfs, against linux-2.6.11-mm2.  I'm hoping
you'll consider putting this version back into your tree - the previous
rounds of comment seem to have shaken out all the API issues and the number
of comments on the code itself have also steadily dwindled.

This patch is essentially the same as the relayfs redux part 5 patch, with
some minor changes based on reviewer comments.  Thanks again to Pekka
Enberg for those.  The patch size without documentation is now a little
smaller at just over 40k.  Here's a detailed list of the changes:

- removed the attribute_flags in relay open and changed it to a
  boolean specifying either overwrite or no-overwrite mode, and removed
  everything referencing the attribute flags.
- added a check for NULL names in relayfs_create_entry()
- got rid of the unnecessary multiple labels in relay_create_buf()
- some minor simplification of relay_alloc_buf() which got rid of a
  couple params
- updated the Documentation

In addition, this version (through code contained in the relay-apps tarball
linked to below, not as part of the relayfs patch) tries to make it as easy
as possible to create the cooperating kernel/user pieces of a typical and
common type of logging application, one where kernel logging is kicked off
when a user space data collection app starts and stops when the collection
app exits, with the data being automatically logged to disk in between.  To
create this type of application, you basically just include a header file
(relay-app.h, included in the relay-apps tarball) in your kernel module,
define a couple of callbacks and call an initialization function, and on
the user side call a single function that sets up and continuously monitors
the buffers, and writes data to files as it becomes available.  Channels
are created when the collection app is started and destroyed when it exits,
not when the kernel module is inserted, so different channel buffer sizes
can be specified for each separate run via command-line options.  See the
README in the relay-apps tarball for details.

Also included in the relay-apps tarball are a couple examples
demonstrating how you can use this to create quick and dirty kernel
logging/debugging applications.  They are:

- tprintk, short for 'tee printk', which temporarily puts a kprobe on
  printk() and writes a duplicate stream of printk output to a relayfs
  channel.  This could be used anywhere there's printk() debugging code
  in the kernel which you'd like to exercise, but would rather not have
  your system logs cluttered with debugging junk.  You'd probably want
  to kill klogd while you do this, otherwise there wouldn't be much
  point (since putting a kprobe on printk() doesn't change the output
  of printk()).  I've used this method to temporarily divert the packet
  logging output of the iptables LOG target from the system logs to
  relayfs files instead, for instance.

- klog, which just provides a printk-like formatted logging function
  on top of relayfs.  Again, you can use this to keep stuff out of your
  system logs if used in place of printk.

The example applications can be found here:

http://prdownloads.sourceforge.net/dprobes/relay-apps.tar.gz?download

From: Christoph Hellwig <hch@lst.de>

  avoid lookup_hash usage in relayfs

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>
2005-09-07 16:57:18 -07:00
..
adfs [ARM] fs/adfs/adfs.h: "extern inline" doesn't make sense 2005-08-20 17:20:28 +01:00
affs Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
afs [PATCH] Fix up symlink function pointers 2005-08-19 18:08:21 -07:00
autofs Fix nasty ncpfs symlink handling bug. 2005-08-19 18:02:56 -07:00
autofs4 [PATCH] Fix up symlink function pointers 2005-08-19 18:08:21 -07:00
befs befs: fix up missed follow_link declaration change 2005-08-20 13:20:01 -07:00
bfs Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cifs [PATCH] Fix oops in fs/locks.c on close of file with pending locks 2005-08-26 16:05:35 -07:00
coda [PATCH] class: convert the remaining class_simple users in the kernel to usee the new class api 2005-06-20 15:15:11 -07:00
cramfs Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
debugfs [PATCH] remove duplicate get_dentry functions in various places 2005-06-23 09:45:20 -07:00
devfs [PATCH] Fix up symlink function pointers 2005-08-19 18:08:21 -07:00
devpts [PATCH] Generic VFS fallback for security xattrs 2005-09-05 00:05:52 -07:00
efs Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
exportfs Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ext2 Fix nasty ncpfs symlink handling bug. 2005-08-19 18:02:56 -07:00
ext3 Fix nasty ncpfs symlink handling bug. 2005-08-19 18:02:56 -07:00
fat [PATCH] fatfs sectioning fix 2005-06-30 22:29:48 -07:00
freevxfs [PATCH] freevxfs: fix breakage introduced by symlink fixes 2005-08-20 14:30:50 -07:00
hfs [PATCH] hfs: don't reference missing page 2005-08-01 21:38:00 -07:00
hfsplus [PATCH] hfs: don't reference missing page 2005-08-01 21:38:00 -07:00
hostfs [PATCH] uml: implement hostfs syncing 2005-07-28 21:46:05 -07:00
hpfs Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
hppfs [PATCH] hppfs: fix symlink error path 2005-08-26 11:39:19 -07:00
hugetlbfs [PATCH] Avoiding mmap fragmentation 2005-06-21 18:46:16 -07:00
isofs Check input buffer size in zisofs 2005-08-06 09:42:06 -07:00
jbd [PATCH] Cleanup patch for process freezing 2005-06-25 17:10:13 -07:00
jffs [PATCH] Fix missing refrigerator invocation in jffs2 2005-07-27 16:25:49 -07:00
jffs2 [PATCH] Fix up symlink function pointers 2005-08-19 18:08:21 -07:00
jfs Merge refs/heads/for-linus from master.kernel.org:/pub/scm/linux/kernel/git/shaggy/jfs-2.6.git 2005-08-30 07:47:42 -07:00
lockd [PATCH] NFS: procfs/sysctl interfaces for lockd do not work on x86_64 2005-07-13 11:25:24 -07:00
minix Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
msdos Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ncpfs [PATCH] fs/ncpfs/: remove unused #ifdef USE_OLD_SLOW_DIRECTORY_LISTING code 2005-06-25 16:25:04 -07:00
nfs [PATCH] NFSv4: unbalanced BKL in nfs_atomic_lookup() 2005-08-19 18:44:56 -07:00
nfs_common [PATCH] NFS: Ensure ACL xdr code doesn't overflow. 2005-08-16 08:52:11 -07:00
nfsd [CRYPTO]: crypto_free_tfm() callers no longer need to check for NULL 2005-09-01 17:44:29 -07:00
nls [PATCH] make some things static 2005-05-05 16:36:47 -07:00
ntfs NTFS: Complete the previous fix for the unset device when mapping buffers 2005-08-16 19:42:56 +01:00
openpromfs Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
partitions [PATCH] small partitions/msdos cleanups 2005-06-25 16:24:59 -07:00
proc [PATCH] add /proc/pid/smaps 2005-09-05 00:05:49 -07:00
qnx4 [PATCH] fs/qnx4/*: fix sparse warnings 2005-06-24 14:14:24 -07:00
ramfs Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
reiserfs [PATCH] reiserfs+acl+quota deadlock fix 2005-08-18 12:53:57 -07:00
relayfs [PATCH] relayfs 2005-09-07 16:57:18 -07:00
romfs Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
smbfs [TCP]: Move the tcp sock states to net/tcp_states.h 2005-08-29 15:41:54 -07:00
sysfs [PATCH] Fix oops in sysfs_hash_and_remove_file() 2005-08-26 19:37:13 -07:00
sysv [PATCH] Fix up symlink function pointers 2005-08-19 18:08:21 -07:00
udf [PATCH] udf_find_entry() cleanup 2005-06-30 08:45:11 -07:00
ufs [PATCH] Fix up symlink function pointers 2005-08-19 18:08:21 -07:00
umsdos Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
vfat Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
xfs [PATCH] Fix up symlink function pointers 2005-08-19 18:08:21 -07:00
Kconfig [PATCH] relayfs 2005-09-07 16:57:18 -07:00
Kconfig.binfmt Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Makefile [PATCH] relayfs 2005-09-07 16:57:18 -07:00
aio.c [PATCH] uml: fixes performance regression in activate_mm and thus exec() 2005-09-05 00:06:21 -07:00
attr.c [PATCH] inotify 2005-07-12 20:38:38 -07:00
bad_inode.c [PATCH] make some things static 2005-05-05 16:36:47 -07:00
binfmt_aout.c [PATCH] Avoiding mmap fragmentation 2005-06-21 18:46:16 -07:00
binfmt_elf.c [PATCH] Avoiding mmap fragmentation 2005-06-21 18:46:16 -07:00
binfmt_elf_fdpic.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
binfmt_em86.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
binfmt_flat.c [PATCH] uclinux: use MAP_PRIVATE when mmaping code regions in flat binary loader 2005-09-02 00:57:31 -07:00
binfmt_misc.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
binfmt_script.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
binfmt_som.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
bio.c [PATCH] __bio_clone() dead comment 2005-08-07 10:00:38 -07:00
block_dev.c [PATCH] block: add unlocked_ioctl support for block devices 2005-06-23 09:45:32 -07:00
buffer.c [PATCH] page_uptodate locking scalability 2005-07-07 18:23:45 -07:00
char_dev.c [PATCH] cdev: cdev_put oops 2005-07-12 16:01:02 -07:00
compat.c [PATCH] inotify 2005-07-12 20:38:38 -07:00
compat_ioctl.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dcache.c [PATCH] fsnotify_name/inoderemove 2005-08-08 11:53:47 -07:00
dcookies.c [PATCH] dcookies.c: use proper refcounting functions 2005-07-07 18:23:52 -07:00
direct-io.c [PATCH] pass iocb to dio_iodone_t 2005-06-24 00:05:19 -07:00
dnotify.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
dquot.c [PATCH] list_for_each_entry: fs-dquot.c 2005-06-25 16:25:11 -07:00
eventpoll.c [PATCH] Remove eventpoll macro obfuscation 2005-06-23 09:45:30 -07:00
exec.c [PATCH] reset real_timer target on exec leader change 2005-07-12 16:01:01 -07:00
fcntl.c [PATCH] stale POSIX lock handling 2005-07-27 16:26:06 -07:00
fifo.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
file.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
file_table.c [PATCH] inotify 2005-07-12 20:38:38 -07:00
filesystems.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
fs-writeback.c [PATCH] O(1) sb list traversing on syncs 2005-06-23 09:45:27 -07:00
inode.c [PATCH] Fix soft lockup due to NTFS: VFS part and explanation 2005-07-13 11:25:24 -07:00
inotify.c [PATCH] Document idr_get_new_above() semantics, update inotify 2005-08-26 11:32:57 -07:00
ioctl.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
ioprio.c Don't allow normal users to set idle IO priority 2005-08-20 18:51:29 -07:00
libfs.c [PATCH] fix fsync(dir) return value for ram-based filesystems 2005-06-25 16:24:38 -07:00
locks.c [PATCH] stale POSIX lock handling 2005-07-27 16:26:06 -07:00
mbcache.c [PATCH] mbcache: Remove unused mb_cache_shrink parameter 2005-07-27 16:26:07 -07:00
mpage.c [PATCH] mpage_end_io_write() I/O error handling fix 2005-06-04 17:12:59 -07:00
namei.c Fix nasty ncpfs symlink handling bug. 2005-08-19 18:02:56 -07:00
namespace.c [PATCH] namespace.c: fix bind mount from foreign namespace 2005-08-07 10:00:38 -07:00
nfsctl.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
open.c [PATCH] inotify 2005-07-12 20:38:38 -07:00
pipe.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
posix_acl.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
quota.c [PATCH] O(1) sb list traversing on syncs 2005-06-23 09:45:27 -07:00
quota_v1.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
quota_v2.c [PATCH] quota: possible bug in quota format v2 support 2005-04-16 15:25:47 -07:00
read_write.c [PATCH] inotify 2005-07-12 20:38:38 -07:00
readdir.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
select.c [PATCH] make some things static 2005-05-05 16:36:47 -07:00
seq_file.c [PATCH] DocBook: fix some descriptions 2005-05-01 08:59:26 -07:00
stat.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
super.c [PATCH] set mnt_namespace in the correct place 2005-07-07 18:23:52 -07:00
xattr.c [PATCH] Generic VFS fallback for security xattrs 2005-09-05 00:05:52 -07:00
xattr_acl.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00