diff options
| author |   Eric Paris <eparis@redhat.com> | 2010-10-25 14:41:59 -0400 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-26 11:37:18 -0700 |
| commit | a178d2027d3198b0a04517d764326ab71cd73da2 (patch) | |
| tree | d81b9336328ba1741231b318a6f8187f627581fd /include/linux/fs.h | |
| parent | IMA: use i_writecount rather than a private counter (diff) | |
| download | linux-dev-a178d2027d3198b0a04517d764326ab71cd73da2.tar.xz linux-dev-a178d2027d3198b0a04517d764326ab71cd73da2.zip | |
IMA: move read counter into struct inode
IMA currently allocated an inode integrity structure for every inode in
core. This stucture is about 120 bytes long. Most files however
(especially on a system which doesn't make use of IMA) will never need
any of this space. The problem is that if IMA is enabled we need to
know information about the number of readers and the number of writers
for every inode on the box. At the moment we collect that information
in the per inode iint structure and waste the rest of the space. This
patch moves those counters into the struct inode so we can eventually
stop allocating an IMA integrity structure except when absolutely
needed.
This patch does the minimum needed to move the location of the data.
Further cleanups, especially the location of counter updates, may still
be possible.
Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/fs.h')
| -rw-r--r-- | include/linux/fs.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 63d069bd80b7..01e3a0047fed 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -776,6 +776,10 @@ struct inode { unsigned int i_flags; +#ifdef CONFIG_IMA + /* protected by i_lock */ + unsigned int i_readcount; /* struct files open RO */ +#endif atomic_t i_writecount; #ifdef CONFIG_SECURITY void *i_security; |