diff options
| author | Latchesar Ionkov <lucho@ionkov.net> | 2006-01-08 01:05:00 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-08 20:14:06 -0800 |
| commit | 531b1094b74365dcc55fa464d28a9a2497ae825d (patch) | |
| tree | a0384dabe3be1c844166d028b3ef7c21c3dfe5fc /fs/9p/vfs_file.c | |
| parent | d8da097afb765654c866062148fd98b11db9003e (diff) | |
[PATCH] v9fs: zero copy implementation
Performance enhancement reducing the number of copies in the data and
stat paths.
Signed-off-by: Latchesar Ionkov <lucho@ionkov.net>
Cc: Eric Van Hensbergen <ericvh@ericvh.myip.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/9p/vfs_file.c')
| -rw-r--r-- | fs/9p/vfs_file.c | 25 |
1 files changed, 4 insertions, 21 deletions
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c index e13577da913..6852f0eb96e 100644 --- a/fs/9p/vfs_file.c +++ b/fs/9p/vfs_file.c @@ -32,6 +32,7 @@ #include <linux/string.h> #include <linux/smp_lock.h> #include <linux/inet.h> +#include <linux/version.h> #include <linux/list.h> #include <asm/uaccess.h> #include <linux/idr.h> @@ -117,9 +118,7 @@ int v9fs_file_open(struct inode *inode, struct file *file) result = v9fs_t_open(v9ses, newfid, open_mode, &fcall); if (result < 0) { - dprintk(DEBUG_ERROR, - "open failed, open_mode 0x%x: %s\n", open_mode, - FCALL_ERROR(fcall)); + PRINT_FCALL_ERROR("open failed", fcall); kfree(fcall); return result; } @@ -256,7 +255,6 @@ v9fs_file_write(struct file *filp, const char __user * data, int result = -EIO; int rsize = 0; int total = 0; - char *buf; dprintk(DEBUG_VFS, "data %p count %d offset %x\n", data, (int)count, (int)*offset); @@ -264,28 +262,14 @@ v9fs_file_write(struct file *filp, const char __user * data, if (v9fid->iounit != 0 && rsize > v9fid->iounit) rsize = v9fid->iounit; - buf = kmalloc(v9ses->maxdata - V9FS_IOHDRSZ, GFP_KERNEL); - if (!buf) - return -ENOMEM; - do { if (count < rsize) rsize = count; - result = copy_from_user(buf, data, rsize); - if (result) { - dprintk(DEBUG_ERROR, "Problem copying from user\n"); - kfree(buf); - return -EFAULT; - } - - dump_data(buf, rsize); - result = v9fs_t_write(v9ses, fid, *offset, rsize, buf, &fcall); + result = v9fs_t_write(v9ses, fid, *offset, rsize, data, &fcall); if (result < 0) { - eprintk(KERN_ERR, "error while writing: %s(%d)\n", - FCALL_ERROR(fcall), result); + PRINT_FCALL_ERROR("error while writing", fcall); kfree(fcall); - kfree(buf); return result; } else *offset += result; @@ -305,7 +289,6 @@ v9fs_file_write(struct file *filp, const char __user * data, total += result; } while (count); - kfree(buf); return total; } |