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linux-sg2042
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fuse: add list of writable files to fuse_inode 

Each WRITE request must carry a valid file descriptor.  When a page is written
back from a memory mapping, the file through which the page was dirtied is not
available, so a new mechananism is needed to find a suitable file in
->writepage(s).

A list of fuse_files is added to fuse_inode.  The file is removed from the
list in fuse_release().

This patch is in preparation for writable mmap support.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miklos Szeredi 2007-10-18 03:07:03 -07:00 committed by Linus Torvalds
parent a9ff4f8705
commit 93a8c3cd9e
3 changed files with 15 additions and 0 deletions
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7
fs/fuse/file.c
View File

@ -56,6 +56,7 @@ struct fuse_file *fuse_file_alloc(void)
kfree(ff);
ff = NULL;
}
INIT_LIST_HEAD(&ff->write_entry);
atomic_set(&ff->count, 0);
}
return ff;
@ -150,12 +151,18 @@ int fuse_release_common(struct inode *inode, struct file *file, int isdir)
{
struct fuse_file *ff = file->private_data;
if (ff) {
struct fuse_conn *fc = get_fuse_conn(inode);
fuse_release_fill(ff, get_node_id(inode), file->f_flags,
isdir ? FUSE_RELEASEDIR : FUSE_RELEASE);
/* Hold vfsmount and dentry until release is finished */
ff->reserved_req->vfsmount = mntget(file->f_path.mnt);
ff->reserved_req->dentry = dget(file->f_path.dentry);
spin_lock(&fc->lock);
list_del(&ff->write_entry);
spin_unlock(&fc->lock);
/*
* Normally this will send the RELEASE request,
* however if some asynchronous READ or WRITE requests

6
fs/fuse/fuse_i.h
View File

@ -70,6 +70,9 @@ struct fuse_inode {
/** Version of last attribute change */
u64 attr_version;
/** Files usable in writepage. Protected by fc->lock */
struct list_head write_files;
};
/** FUSE specific file data */
@ -82,6 +85,9 @@ struct fuse_file {
/** Refcount */
atomic_t count;
/** Entry on inode's write_files list */
struct list_head write_entry;
};
/** One input argument of a request */

2
fs/fuse/inode.c
View File

@ -56,6 +56,7 @@ static struct inode *fuse_alloc_inode(struct super_block *sb)
fi->i_time = 0;
fi->nodeid = 0;
fi->nlookup = 0;
INIT_LIST_HEAD(&fi->write_files);
fi->forget_req = fuse_request_alloc();
if (!fi->forget_req) {
kmem_cache_free(fuse_inode_cachep, inode);
@ -68,6 +69,7 @@ static struct inode *fuse_alloc_inode(struct super_block *sb)
static void fuse_destroy_inode(struct inode *inode)
{
struct fuse_inode *fi = get_fuse_inode(inode);
BUG_ON(!list_empty(&fi->write_files));
if (fi->forget_req)
fuse_request_free(fi->forget_req);
kmem_cache_free(fuse_inode_cachep, inode);