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fs/9p: Add buffered write support for v9fs.

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We can now support writeable mmaps.
Based on the original patch from Badari Pulavarty <pbadari@us.ibm.com>

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Aneesh Kumar K.V
2011-02-28 17:03:58 +05:30
committed by Eric Van Hensbergen
parent 3cf387d780
commit 7263cebed9
2 changed files with 218 additions and 19 deletions
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54
fs/9p/vfs_file.c
View File

@@ -44,6 +44,8 @@
#include "fid.h"
#include "cache.h"
static const struct vm_operations_struct v9fs_file_vm_ops;
/**
* v9fs_file_open - open a file (or directory)
* @inode: inode to be opened
@@ -503,6 +505,7 @@ out:
return retval;
}
static int v9fs_file_fsync(struct file *filp, int datasync)
{
struct p9_fid *fid;
@@ -532,28 +535,71 @@ int v9fs_file_fsync_dotl(struct file *filp, int datasync)
return retval;
}
static int
v9fs_file_mmap(struct file *file, struct vm_area_struct *vma)
{
int retval;
retval = generic_file_mmap(file, vma);
if (!retval)
vma->vm_ops = &v9fs_file_vm_ops;
return retval;
}
static int
v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct page *page = vmf->page;
struct file *filp = vma->vm_file;
struct inode *inode = filp->f_path.dentry->d_inode;
P9_DPRINTK(P9_DEBUG_VFS, "page %p fid %lx\n",
page, (unsigned long)filp->private_data);
/* make sure the cache has finished storing the page */
v9fs_fscache_wait_on_page_write(inode, page);
BUG_ON(!inode->i_private);
lock_page(page);
if (page->mapping != inode->i_mapping)
goto out_unlock;
return VM_FAULT_LOCKED;
out_unlock:
unlock_page(page);
return VM_FAULT_NOPAGE;
}
static const struct vm_operations_struct v9fs_file_vm_ops = {
.fault = filemap_fault,
.page_mkwrite = v9fs_vm_page_mkwrite,
};
const struct file_operations v9fs_cached_file_operations = {
.llseek = generic_file_llseek,
.read = do_sync_read,
.write = do_sync_write,
.aio_read = generic_file_aio_read,
.write = v9fs_file_write,
.aio_write = generic_file_aio_write,
.open = v9fs_file_open,
.release = v9fs_dir_release,
.lock = v9fs_file_lock,
.mmap = generic_file_readonly_mmap,
.mmap = v9fs_file_mmap,
.fsync = v9fs_file_fsync,
};
const struct file_operations v9fs_cached_file_operations_dotl = {
.llseek = generic_file_llseek,
.read = do_sync_read,
.write = do_sync_write,
.aio_read = generic_file_aio_read,
.write = v9fs_file_write,
.aio_write = generic_file_aio_write,
.open = v9fs_file_open,
.release = v9fs_dir_release,
.lock = v9fs_file_lock_dotl,
.flock = v9fs_file_flock_dotl,
.mmap = generic_file_readonly_mmap,
.mmap = v9fs_file_mmap,
.fsync = v9fs_file_fsync_dotl,
};