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Many struct inode_operations in the kernel can be "const". Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data. In addition it'll catch accidental writes at compile time to
these shared resources.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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This patch cleans up generic_file_*_read/write() interfaces. Christoph
Hellwig gave me the idea for this clean ups.
In a nutshell, all filesystems should set .aio_read/.aio_write methods and use
do_sync_read/ do_sync_write() as their .read/.write methods. This allows us
to cleanup all variants of generic_file_* routines.
Final available interfaces:
generic_file_aio_read() - read handler
generic_file_aio_write() - write handler
generic_file_aio_write_nolock() - no lock write handler
__generic_file_aio_write_nolock() - internal worker routine
Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Same as with already do with the file operations: keep them in .rodata and
prevents people from doing runtime patching.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Steven French <sfrench@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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This is a conversion to make the various file_operations structs in fs/
const. Basically a regexp job, with a few manual fixups
The goal is both to increase correctness (harder to accidentally write to
shared datastructures) and reducing the false sharing of cachelines with
things that get dirty in .data (while .rodata is nicely read only and thus
cache clean)
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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* Makes BFS code endianness-clean.
* Fixes some signedness warnings.
* Fixes a problem in fs/bfs/inode.c:164 where inodes not synced to disk
don't get fully marked as clean. Here's how to reproduce it:
# mount -o loop -t bfs /bfs.img /mnt
# df -i /mnt
Filesystem Inodes IUsed IFree IUse% Mounted on
/bfs.img 48 1 47 3% /mnt
# df -k /mnt
Filesystem 1K-blocks Used Available Use% Mounted on
/bfs.img 512 5 508 1% /mnt
# cp 60k-archive.zip /mnt/mt.zip
# df -k /mnt
Filesystem 1K-blocks Used Available Use% Mounted on
/bfs.img 512 65 447 13% /mnt
# df -i /mnt
Filesystem Inodes IUsed IFree IUse% Mounted on
/bfs.img 48 2 46 5% /mnt
# rm /mnt/mt.zip
# echo $?
0
[If the unlink happens before the buffers flush, the following happens:]
# df -i /mnt
Filesystem Inodes IUsed IFree IUse% Mounted on
/bfs.img 48 2 46 5% /mnt
# df -k /mnt
Filesystem 1K-blocks Used Available Use% Mounted on
/bfs.img 512 65 447 13% /mnt
fs/bfs/bfs.h | 1
Signed-off-by: Andrew Stribblehill <ads@wompom.org>
Cc: <tigran@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
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