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author | Miklos Szeredi <miklos@szeredi.hu> | 2005-11-07 00:59:51 -0800 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-07 07:53:42 -0800 |
commit | fd72faac95d7e47610e981d7ed7b3c1529e55c88 (patch) | |
tree | 65cde1eb6958f410c4b4c72e322fd59db463150f /fs/fuse/file.c | |
parent | 31d40d74b402a6fa18a006fb3745f64609f35b77 (diff) | |
download | linux-fd72faac95d7e47610e981d7ed7b3c1529e55c88.tar.gz linux-fd72faac95d7e47610e981d7ed7b3c1529e55c88.tar.xz |
[PATCH] FUSE: atomic create+open
This patch adds an atomic create+open operation. This does not yet work if
the file type changes between lookup and create+open, but solves the
permission checking problems for the separte create and open methods.
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/fuse/file.c')
-rw-r--r-- | fs/fuse/file.c | 132 |
1 files changed, 85 insertions, 47 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 657ab11c173b..2ca86141d13a 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -14,11 +14,69 @@ static struct file_operations fuse_direct_io_file_operations; -int fuse_open_common(struct inode *inode, struct file *file, int isdir) +static int fuse_send_open(struct inode *inode, struct file *file, int isdir, + struct fuse_open_out *outargp) { struct fuse_conn *fc = get_fuse_conn(inode); - struct fuse_req *req; struct fuse_open_in inarg; + struct fuse_req *req; + int err; + + req = fuse_get_request(fc); + if (!req) + return -EINTR; + + memset(&inarg, 0, sizeof(inarg)); + inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC); + req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; + req->in.h.nodeid = get_node_id(inode); + req->inode = inode; + req->in.numargs = 1; + req->in.args[0].size = sizeof(inarg); + req->in.args[0].value = &inarg; + req->out.numargs = 1; + req->out.args[0].size = sizeof(*outargp); + req->out.args[0].value = outargp; + request_send(fc, req); + err = req->out.h.error; + fuse_put_request(fc, req); + + return err; +} + +struct fuse_file *fuse_file_alloc(void) +{ + struct fuse_file *ff; + ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL); + if (ff) { + ff->release_req = fuse_request_alloc(); + if (!ff->release_req) { + kfree(ff); + ff = NULL; + } + } + return ff; +} + +void fuse_file_free(struct fuse_file *ff) +{ + fuse_request_free(ff->release_req); + kfree(ff); +} + +void fuse_finish_open(struct inode *inode, struct file *file, + struct fuse_file *ff, struct fuse_open_out *outarg) +{ + if (outarg->open_flags & FOPEN_DIRECT_IO) + file->f_op = &fuse_direct_io_file_operations; + if (!(outarg->open_flags & FOPEN_KEEP_CACHE)) + invalidate_inode_pages(inode->i_mapping); + ff->fh = outarg->fh; + file->private_data = ff; +} + +int fuse_open_common(struct inode *inode, struct file *file, int isdir) +{ struct fuse_open_out outarg; struct fuse_file *ff; int err; @@ -34,73 +92,53 @@ int fuse_open_common(struct inode *inode, struct file *file, int isdir) /* If opening the root node, no lookup has been performed on it, so the attributes must be refreshed */ if (get_node_id(inode) == FUSE_ROOT_ID) { - int err = fuse_do_getattr(inode); + err = fuse_do_getattr(inode); if (err) return err; } - req = fuse_get_request(fc); - if (!req) - return -EINTR; - - err = -ENOMEM; - ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL); + ff = fuse_file_alloc(); if (!ff) - goto out_put_request; + return -ENOMEM; - ff->release_req = fuse_request_alloc(); - if (!ff->release_req) { - kfree(ff); - goto out_put_request; - } - - memset(&inarg, 0, sizeof(inarg)); - inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC); - req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; - req->in.h.nodeid = get_node_id(inode); - req->inode = inode; - req->in.numargs = 1; - req->in.args[0].size = sizeof(inarg); - req->in.args[0].value = &inarg; - req->out.numargs = 1; - req->out.args[0].size = sizeof(outarg); - req->out.args[0].value = &outarg; - request_send(fc, req); - err = req->out.h.error; - if (err) { - fuse_request_free(ff->release_req); - kfree(ff); - } else { - if (!isdir && (outarg.open_flags & FOPEN_DIRECT_IO)) - file->f_op = &fuse_direct_io_file_operations; - if (!(outarg.open_flags & FOPEN_KEEP_CACHE)) - invalidate_inode_pages(inode->i_mapping); - ff->fh = outarg.fh; - file->private_data = ff; + err = fuse_send_open(inode, file, isdir, &outarg); + if (err) + fuse_file_free(ff); + else { + if (isdir) + outarg.open_flags &= ~FOPEN_DIRECT_IO; + fuse_finish_open(inode, file, ff, &outarg); } - out_put_request: - fuse_put_request(fc, req); return err; } -int fuse_release_common(struct inode *inode, struct file *file, int isdir) +void fuse_send_release(struct fuse_conn *fc, struct fuse_file *ff, + u64 nodeid, struct inode *inode, int flags, int isdir) { - struct fuse_conn *fc = get_fuse_conn(inode); - struct fuse_file *ff = file->private_data; - struct fuse_req *req = ff->release_req; + struct fuse_req * req = ff->release_req; struct fuse_release_in *inarg = &req->misc.release_in; inarg->fh = ff->fh; - inarg->flags = file->f_flags & ~O_EXCL; + inarg->flags = flags; req->in.h.opcode = isdir ? FUSE_RELEASEDIR : FUSE_RELEASE; - req->in.h.nodeid = get_node_id(inode); + req->in.h.nodeid = nodeid; req->inode = inode; req->in.numargs = 1; req->in.args[0].size = sizeof(struct fuse_release_in); req->in.args[0].value = inarg; request_send_background(fc, req); kfree(ff); +} + +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); + u64 nodeid = get_node_id(inode); + fuse_send_release(fc, ff, nodeid, inode, file->f_flags, isdir); + } /* Return value is ignored by VFS */ return 0; |