linux/fs/read_write.c, branch v2.6.23

Remove remnants of sendfile()

2007-07-10T06:04:15Z

There are now zero users of .sendfile() in the kernel, so kill it from the file_operations structure and in do_sendfile(). Signed-off-by: Jens Axboe

splice: divorce the splice structure/function definitions from the pipe header

2007-07-10T06:04:14Z

We need to move even more stuff into the header so that folks can use the splice_to_pipe() implementation instead of open-coding a lot of pipe knowledge (see relay implementation), so move to our own header file finally. Signed-off-by: Jens Axboe

sys_sendfile: switch to using ->splice_read, if available

2007-07-10T06:04:12Z

This patch makes sendfile prefer to use ->splice_read(), if it's available in the file_operations structure. Signed-off-by: Jens Axboe

use use SEEK_MAX to validate user lseek arguments

2007-05-08T18:14:59Z

Add SEEK_MAX and use it to validate lseek arguments from userspace. Signed-off-by: Chris Snook Acked-by: David Howells Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

use symbolic constants in generic lseek code

2007-05-08T18:14:59Z

Convert magic numbers to SEEK_* values from fs.h Signed-off-by: Chris Snook Acked-by: David Howells Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] FS: speed up rw_verify_area()

2007-02-12T17:48:29Z

oprofile hunting showed a stall in rw_verify_area(), because of triple indirection and potential cache misses. (file->f_path.dentry->d_inode->i_flock) By moving initialization of 'struct inode' pointer before the pos/count sanity tests, we allow the compiler and processor to perform two loads by anticipation, reducing stall, without prefetch() hints. Even x86 arch has enough registers to not use temporary variables and not increase text size. I validated this patch running a bench and studied oprofile changes, and absolute perf of the test program. Results of my epoll_pipe_bench (source available on request) on a Pentium-M 1.6 GHz machine Before : # ./epoll_pipe_bench -l 30 -t 20 Avg: 436089 evts/sec read_count=8843037 write_count=8843040 21.218390 samples per call (best value out of 10 runs) After : # ./epoll_pipe_bench -l 30 -t 20 Avg: 470980 evts/sec read_count=9549871 write_count=9549894 21.216694 samples per call (best value out of 10 runs) oprofile CPU_CLK_UNHALTED events gave a reduction from 5.3401 % to 2.5851 % for the rw_verify_area() function. Signed-off-by: Eric Dumazet Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] ifdef ->rchar, ->wchar, ->syscr, ->syscw from task_struct

2007-02-11T19:18:07Z

They are fat: 4x8 bytes in task_struct. They are uncoditionally updated in every fork, read, write and sendfile. They are used only if you have some "extended acct fields feature". And please, please, please, read(2) knows about bytes, not characters, why it is called "rchar"? Signed-off-by: Alexey Dobriyan Cc: Jay Lan Cc: Balbir Singh Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] one more EXPORT_UNUSED_SYMBOL removal

2006-12-13T17:05:53Z

Signed-off-by: Adrian Bunk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] VFS: change struct file to use struct path

2006-12-08T16:28:41Z

This patch changes struct file to use struct path instead of having independent pointers to struct dentry and struct vfsmount, and converts all users of f_{dentry,vfsmnt} in fs/ to use f_path.{dentry,mnt}. Additionally, it adds two #define's to make the transition easier for users of the f_dentry and f_vfsmnt. Signed-off-by: Josef "Jeff" Sipek Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[PATCH] Add vector AIO support

2006-10-01T07:39:29Z

This work is initially done by Zach Brown to add support for vectored aio. These are the core changes for AIO to support IOCB_CMD_PREADV/IOCB_CMD_PWRITEV. [akpm@osdl.org: huge build fix] Signed-off-by: Zach Brown Signed-off-by: Christoph Hellwig Signed-off-by: Badari Pulavarty Acked-by: Benjamin LaHaise Acked-by: James Morris Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds