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[PATCH] xip: reduce code duplication

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This patch reworks filemap_xip.c with the goal to reduce code duplication
from mm/filemap.c.  It applies agains 2.6.12-rc6-mm1.  Instead of
implementing the aio functions, this one implements the synchronous
read/write functions only.  For readv and writev, the generic fallback is
used.  For aio, we rely on the application doing the fallback.  Since our
"synchronous" function does memcpy immediately anyway, there is no
performance difference between using the fallbacks or implementing each
operation.

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Carsten Otte
2005-06-23 22:05:28 -07:00
committed by Linus Torvalds
parent 6d79125bba
commit eb6fe0c388
4 changed files with 65 additions and 207 deletions
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12
include/linux/fs.h
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@ -1500,18 +1500,14 @@ extern int generic_file_open(struct inode * inode, struct file * filp);
extern int nonseekable_open(struct inode * inode, struct file * filp);
#ifdef CONFIG_FS_XIP
extern ssize_t xip_file_aio_read(struct kiocb *iocb, char __user *buf,
size_t count, loff_t pos);
extern ssize_t xip_file_readv(struct file *filp, const struct iovec *iov,
unsigned long nr_segs, loff_t *ppos);
extern ssize_t xip_file_read(struct file *filp, char __user *buf, size_t len,
loff_t *ppos);
extern ssize_t xip_file_sendfile(struct file *in_file, loff_t *ppos,
size_t count, read_actor_t actor,
void *target);
extern int xip_file_mmap(struct file * file, struct vm_area_struct * vma);
extern ssize_t xip_file_aio_write(struct kiocb *iocb, const char __user *buf,
size_t count, loff_t pos);
extern ssize_t xip_file_writev(struct file *file, const struct iovec *iov,
unsigned long nr_segs, loff_t *ppos);
extern ssize_t xip_file_write(struct file *filp, const char __user *buf,
size_t len, loff_t *ppos);
extern int xip_truncate_page(struct address_space *mapping, loff_t from);
#else
static inline int xip_truncate_page(struct address_space *mapping, loff_t from)