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fuse: implement i_op->atomic_open()

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Add an ->atomic_open implementation which replaces the atomic open+create
operation implemented via ->create.  No functionality is changed.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Miklos Szeredi 2012-06-05 15:10:22 +02:00 committed by Al Viro
parent eda72afb9e
commit c8ccbe032f
1 changed files with 67 additions and 27 deletions
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94
fs/fuse/dir.c
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@ -369,8 +369,9 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
* If the filesystem doesn't support this, then fall back to separate
* 'mknod' + 'open' requests.
*/
static int fuse_create_open(struct inode *dir, struct dentry *entry,
umode_t mode, struct nameidata *nd)
static struct file *fuse_create_open(struct inode *dir, struct dentry *entry,
struct opendata *od, unsigned flags,
umode_t mode)
{
int err;
struct inode *inode;
@ -382,14 +383,11 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
struct fuse_entry_out outentry;
struct fuse_file *ff;
struct file *file;
int flags = nd->intent.open.flags;
if (fc->no_create)
return -ENOSYS;
forget = fuse_alloc_forget();
err = -ENOMEM;
if (!forget)
return -ENOMEM;
goto out_err;
req = fuse_get_req(fc);
err = PTR_ERR(req);
@ -428,11 +426,8 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
req->out.args[1].value = &outopen;
fuse_request_send(fc, req);
err = req->out.h.error;
if (err) {
if (err == -ENOSYS)
fc->no_create = 1;
if (err)
goto out_free_ff;
}
err = -EIO;
if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
@ -448,28 +443,78 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
fuse_sync_release(ff, flags);
fuse_queue_forget(fc, forget, outentry.nodeid, 1);
return -ENOMEM;
err = -ENOMEM;
goto out_err;
}
kfree(forget);
d_instantiate(entry, inode);
fuse_change_entry_timeout(entry, &outentry);
fuse_invalidate_attr(dir);
file = lookup_instantiate_filp(nd, entry, generic_file_open);
file = finish_open(od, entry, generic_file_open);
if (IS_ERR(file)) {
fuse_sync_release(ff, flags);
return PTR_ERR(file);
} else {
file->private_data = fuse_file_get(ff);
fuse_finish_open(inode, file);
}
file->private_data = fuse_file_get(ff);
fuse_finish_open(inode, file);
return 0;
return file;
out_free_ff:
out_free_ff:
fuse_file_free(ff);
out_put_request:
out_put_request:
fuse_put_request(fc, req);
out_put_forget_req:
out_put_forget_req:
kfree(forget);
return err;
out_err:
return ERR_PTR(err);
}
static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t);
static struct file *fuse_atomic_open(struct inode *dir, struct dentry *entry,
struct opendata *od, unsigned flags,
umode_t mode, bool *created)
{
int err;
struct fuse_conn *fc = get_fuse_conn(dir);
struct file *file;
struct dentry *res = NULL;
if (d_unhashed(entry)) {
res = fuse_lookup(dir, entry, NULL);
if (IS_ERR(res))
return ERR_CAST(res);
if (res)
entry = res;
}
if (!(flags & O_CREAT) || entry->d_inode)
goto no_open;
/* Only creates */
*created = true;
if (fc->no_create)
goto mknod;
file = fuse_create_open(dir, entry, od, flags, mode);
if (PTR_ERR(file) == -ENOSYS) {
fc->no_create = 1;
goto mknod;
}
out_dput:
dput(res);
return file;
mknod:
err = fuse_mknod(dir, entry, mode, 0);
if (err) {
file = ERR_PTR(err);
goto out_dput;
}
no_open:
finish_no_open(od, res);
return NULL;
}
/*
@ -573,12 +618,6 @@ static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode,
static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode,
struct nameidata *nd)
{
if (nd) {
int err = fuse_create_open(dir, entry, mode, nd);
if (err != -ENOSYS)
return err;
/* Fall back on mknod */
}
return fuse_mknod(dir, entry, mode, 0);
}
@ -1646,6 +1685,7 @@ static const struct inode_operations fuse_dir_inode_operations = {
.link = fuse_link,
.setattr = fuse_setattr,
.create = fuse_create,
.atomic_open = fuse_atomic_open,
.mknod = fuse_mknod,
.permission = fuse_permission,
.getattr = fuse_getattr,