From 6b2db28a7a2da1064df9e179d9b6d07b0bfe156a Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 14 Apr 2009 10:54:49 +0900 Subject: fuse: misc cleanups * fuse_file_alloc() was structured in weird way. The success path was split between else block and code following the block. Restructure the code such that it's easier to read and modify. * Unindent success path of fuse_release_common() to ease future changes. Signed-off-by: Tejun Heo Signed-off-by: Miklos Szeredi --- fs/fuse/file.c | 81 +++++++++++++++++++++++++++++++--------------------------- 1 file changed, 44 insertions(+), 37 deletions(-) (limited to 'fs/fuse') diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 06f30e965676..028e17decf2f 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -49,22 +49,26 @@ static int fuse_send_open(struct inode *inode, struct file *file, int isdir, struct fuse_file *fuse_file_alloc(struct fuse_conn *fc) { struct fuse_file *ff; + ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL); - if (ff) { - ff->reserved_req = fuse_request_alloc(); - if (!ff->reserved_req) { - kfree(ff); - return NULL; - } else { - INIT_LIST_HEAD(&ff->write_entry); - atomic_set(&ff->count, 0); - spin_lock(&fc->lock); - ff->kh = ++fc->khctr; - spin_unlock(&fc->lock); - } - RB_CLEAR_NODE(&ff->polled_node); - init_waitqueue_head(&ff->poll_wait); + if (unlikely(!ff)) + return NULL; + + ff->reserved_req = fuse_request_alloc(); + if (unlikely(!ff->reserved_req)) { + kfree(ff); + return NULL; } + + INIT_LIST_HEAD(&ff->write_entry); + atomic_set(&ff->count, 0); + RB_CLEAR_NODE(&ff->polled_node); + init_waitqueue_head(&ff->poll_wait); + + spin_lock(&fc->lock); + ff->kh = ++fc->khctr; + spin_unlock(&fc->lock); + return ff; } @@ -158,34 +162,37 @@ void fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, int opcode) 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); - struct fuse_req *req = ff->reserved_req; + struct fuse_conn *fc; + struct fuse_file *ff; + struct fuse_req *req; - fuse_release_fill(ff, get_node_id(inode), file->f_flags, - isdir ? FUSE_RELEASEDIR : FUSE_RELEASE); + ff = file->private_data; + if (unlikely(!ff)) + return 0; /* return value is ignored by VFS */ - /* Hold vfsmount and dentry until release is finished */ - req->misc.release.vfsmount = mntget(file->f_path.mnt); - req->misc.release.dentry = dget(file->f_path.dentry); + fc = get_fuse_conn(inode); + req = ff->reserved_req; - spin_lock(&fc->lock); - list_del(&ff->write_entry); - if (!RB_EMPTY_NODE(&ff->polled_node)) - rb_erase(&ff->polled_node, &fc->polled_files); - spin_unlock(&fc->lock); + fuse_release_fill(ff, get_node_id(inode), file->f_flags, + isdir ? FUSE_RELEASEDIR : FUSE_RELEASE); - wake_up_interruptible_sync(&ff->poll_wait); - /* - * Normally this will send the RELEASE request, - * however if some asynchronous READ or WRITE requests - * are outstanding, the sending will be delayed - */ - fuse_file_put(ff); - } + /* Hold vfsmount and dentry until release is finished */ + req->misc.release.vfsmount = mntget(file->f_path.mnt); + req->misc.release.dentry = dget(file->f_path.dentry); + + spin_lock(&fc->lock); + list_del(&ff->write_entry); + if (!RB_EMPTY_NODE(&ff->polled_node)) + rb_erase(&ff->polled_node, &fc->polled_files); + spin_unlock(&fc->lock); - /* Return value is ignored by VFS */ + wake_up_interruptible_sync(&ff->poll_wait); + /* + * Normally this will send the RELEASE request, however if + * some asynchronous READ or WRITE requests are outstanding, + * the sending will be delayed. + */ + fuse_file_put(ff); return 0; } -- cgit v1.2.3 From b0be46ebf72ca7478c1c4bd0153c42f90e768a03 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 28 Apr 2009 16:56:36 +0200 Subject: fuse: use struct path in release structure Use struct path instead of separate dentry and vfsmount in req->misc.release. Signed-off-by: Miklos Szeredi --- fs/fuse/file.c | 9 ++++----- fs/fuse/fuse_i.h | 3 +-- 2 files changed, 5 insertions(+), 7 deletions(-) (limited to 'fs/fuse') diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 028e17decf2f..3c8fa93524b0 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -86,15 +86,14 @@ static struct fuse_file *fuse_file_get(struct fuse_file *ff) static void fuse_release_end(struct fuse_conn *fc, struct fuse_req *req) { - dput(req->misc.release.dentry); - mntput(req->misc.release.vfsmount); + path_put(&req->misc.release.path); } static void fuse_file_put(struct fuse_file *ff) { if (atomic_dec_and_test(&ff->count)) { struct fuse_req *req = ff->reserved_req; - struct inode *inode = req->misc.release.dentry->d_inode; + struct inode *inode = req->misc.release.path.dentry->d_inode; struct fuse_conn *fc = get_fuse_conn(inode); req->end = fuse_release_end; fuse_request_send_background(fc, req); @@ -177,8 +176,8 @@ int fuse_release_common(struct inode *inode, struct file *file, int isdir) isdir ? FUSE_RELEASEDIR : FUSE_RELEASE); /* Hold vfsmount and dentry until release is finished */ - req->misc.release.vfsmount = mntget(file->f_path.mnt); - req->misc.release.dentry = dget(file->f_path.dentry); + path_get(&file->f_path); + req->misc.release.path = file->f_path; spin_lock(&fc->lock); list_del(&ff->write_entry); diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index 6fc5aedaa0d5..146317ff81b9 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -248,8 +248,7 @@ struct fuse_req { struct fuse_forget_in forget_in; struct { struct fuse_release_in in; - struct vfsmount *vfsmount; - struct dentry *dentry; + struct path path; } release; struct fuse_init_in init_in; struct fuse_init_out init_out; -- cgit v1.2.3 From 2d698b070382442f817813b9dd0103034e5bca81 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 28 Apr 2009 16:56:36 +0200 Subject: fuse: clean up fuse_write_fill() Move out code from fuse_write_fill() which is not common to all callers. Remove two function arguments which become unnecessary. Also remove unnecessary memset(), the request is already initialized to zero. Signed-off-by: Miklos Szeredi --- fs/fuse/file.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-) (limited to 'fs/fuse') diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 3c8fa93524b0..823f84a69733 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -613,20 +613,16 @@ static ssize_t fuse_file_aio_read(struct kiocb *iocb, const struct iovec *iov, return generic_file_aio_read(iocb, iov, nr_segs, pos); } -static void fuse_write_fill(struct fuse_req *req, struct file *file, - struct fuse_file *ff, struct inode *inode, - loff_t pos, size_t count, int writepage) +static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff, + struct inode *inode, loff_t pos, size_t count) { struct fuse_conn *fc = get_fuse_conn(inode); struct fuse_write_in *inarg = &req->misc.write.in; struct fuse_write_out *outarg = &req->misc.write.out; - memset(inarg, 0, sizeof(struct fuse_write_in)); inarg->fh = ff->fh; inarg->offset = pos; inarg->size = count; - inarg->write_flags = writepage ? FUSE_WRITE_CACHE : 0; - inarg->flags = file ? file->f_flags : 0; req->in.h.opcode = FUSE_WRITE; req->in.h.nodeid = get_node_id(inode); req->in.numargs = 2; @@ -646,9 +642,11 @@ static size_t fuse_send_write(struct fuse_req *req, struct file *file, fl_owner_t owner) { struct fuse_conn *fc = get_fuse_conn(inode); - fuse_write_fill(req, file, file->private_data, inode, pos, count, 0); + struct fuse_write_in *inarg = &req->misc.write.in; + + fuse_write_fill(req, file->private_data, inode, pos, count); + inarg->flags = file->f_flags; if (owner != NULL) { - struct fuse_write_in *inarg = &req->misc.write.in; inarg->write_flags |= FUSE_WRITE_LOCKOWNER; inarg->lock_owner = fuse_lock_owner_id(fc, owner); } @@ -1183,9 +1181,10 @@ static int fuse_writepage_locked(struct page *page) req->ff = fuse_file_get(ff); spin_unlock(&fc->lock); - fuse_write_fill(req, NULL, ff, inode, page_offset(page), 0, 1); + fuse_write_fill(req, ff, inode, page_offset(page), 0); copy_highpage(tmp_page, page); + req->misc.write.in.write_flags |= FUSE_WRITE_CACHE; req->in.argpages = 1; req->num_pages = 1; req->pages[0] = tmp_page; -- cgit v1.2.3 From d09cb9d7f6e4cb1dd0cf12ee0d352440291c74cf Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 28 Apr 2009 16:56:36 +0200 Subject: fuse: prepare fuse_direct_io() for CUSE Move code operating on the inode out from fuse_direct_io(). This prepares this function for use by CUSE, where the inode is not owned by a fuse filesystem. Signed-off-by: Miklos Szeredi --- fs/fuse/file.c | 33 +++++++++++++++++++++++---------- 1 file changed, 23 insertions(+), 10 deletions(-) (limited to 'fs/fuse') diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 823f84a69733..b83d7d86b527 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -993,9 +993,6 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf, ssize_t res = 0; struct fuse_req *req; - if (is_bad_inode(inode)) - return -EIO; - req = fuse_get_req(fc); if (IS_ERR(req)) return PTR_ERR(req); @@ -1038,12 +1035,8 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf, } } fuse_put_request(fc, req); - if (res > 0) { - if (write) - fuse_write_update_size(inode, pos); + if (res > 0) *ppos = pos; - } - fuse_invalidate_attr(inode); return res; } @@ -1051,7 +1044,17 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf, static ssize_t fuse_direct_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { - return fuse_direct_io(file, buf, count, ppos, 0); + ssize_t res; + struct inode *inode = file->f_path.dentry->d_inode; + + if (is_bad_inode(inode)) + return -EIO; + + res = fuse_direct_io(file, buf, count, ppos, 0); + + fuse_invalidate_attr(inode); + + return res; } static ssize_t fuse_direct_write(struct file *file, const char __user *buf, @@ -1059,12 +1062,22 @@ static ssize_t fuse_direct_write(struct file *file, const char __user *buf, { struct inode *inode = file->f_path.dentry->d_inode; ssize_t res; + + if (is_bad_inode(inode)) + return -EIO; + /* Don't allow parallel writes to the same file */ mutex_lock(&inode->i_mutex); res = generic_write_checks(file, ppos, &count, 0); - if (!res) + if (!res) { res = fuse_direct_io(file, buf, count, ppos, 1); + if (res > 0) + fuse_write_update_size(inode, *ppos); + } mutex_unlock(&inode->i_mutex); + + fuse_invalidate_attr(inode); + return res; } -- cgit v1.2.3 From da5e4714578ff323f7a61af490fc3539e68f188b Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 28 Apr 2009 16:56:36 +0200 Subject: fuse: add members to struct fuse_file Add new members ->fc and ->nodeid to struct fuse_file. This will aid in converting functions for use by CUSE, where the inode is not owned by a fuse filesystem. Signed-off-by: Miklos Szeredi --- fs/fuse/file.c | 2 ++ fs/fuse/fuse_i.h | 10 ++++++++-- 2 files changed, 10 insertions(+), 2 deletions(-) (limited to 'fs/fuse') diff --git a/fs/fuse/file.c b/fs/fuse/file.c index b83d7d86b527..3be030105354 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -54,6 +54,7 @@ struct fuse_file *fuse_file_alloc(struct fuse_conn *fc) if (unlikely(!ff)) return NULL; + ff->fc = fc; ff->reserved_req = fuse_request_alloc(); if (unlikely(!ff->reserved_req)) { kfree(ff); @@ -111,6 +112,7 @@ void fuse_finish_open(struct inode *inode, struct file *file, if (outarg->open_flags & FOPEN_NONSEEKABLE) nonseekable_open(inode, file); ff->fh = outarg->fh; + ff->nodeid = get_node_id(inode); file->private_data = fuse_file_get(ff); } diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index 146317ff81b9..4469d9971588 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -97,8 +97,13 @@ struct fuse_inode { struct list_head writepages; }; +struct fuse_conn; + /** FUSE specific file data */ struct fuse_file { + /** Fuse connection for this file */ + struct fuse_conn *fc; + /** Request reserved for flush and release */ struct fuse_req *reserved_req; @@ -108,6 +113,9 @@ struct fuse_file { /** File handle used by userspace */ u64 fh; + /** Node id of this file */ + u64 nodeid; + /** Refcount */ atomic_t count; @@ -185,8 +193,6 @@ enum fuse_req_state { FUSE_REQ_FINISHED }; -struct fuse_conn; - /** * A request to the client */ -- cgit v1.2.3 From 2106cb18930312af9325d3418e138569c5b903cc Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 28 Apr 2009 16:56:37 +0200 Subject: fuse: don't use inode in helpers called by fuse_direct_io() Use ff->fc and ff->nodeid instead of passing down the inode. This prepares this function for use by CUSE, where the inode is not owned by a fuse filesystem. Signed-off-by: Miklos Szeredi --- fs/fuse/dir.c | 2 +- fs/fuse/file.c | 62 +++++++++++++++++++++++++++----------------------------- fs/fuse/fuse_i.h | 2 +- 3 files changed, 32 insertions(+), 34 deletions(-) (limited to 'fs/fuse') diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index 8b8eebc5614b..222584b34ce4 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -1035,7 +1035,7 @@ static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir) req->out.argpages = 1; req->num_pages = 1; req->pages[0] = page; - fuse_read_fill(req, file, inode, file->f_pos, PAGE_SIZE, FUSE_READDIR); + fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, FUSE_READDIR); fuse_request_send(fc, req); nbytes = req->out.args[0].size; err = req->out.h.error; diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 3be030105354..aa4a3876ca37 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -379,8 +379,8 @@ static int fuse_fsync(struct file *file, struct dentry *de, int datasync) return fuse_fsync_common(file, de, datasync, 0); } -void fuse_read_fill(struct fuse_req *req, struct file *file, - struct inode *inode, loff_t pos, size_t count, int opcode) +void fuse_read_fill(struct fuse_req *req, struct file *file, loff_t pos, + size_t count, int opcode) { struct fuse_read_in *inarg = &req->misc.read.in; struct fuse_file *ff = file->private_data; @@ -390,7 +390,7 @@ void fuse_read_fill(struct fuse_req *req, struct file *file, inarg->size = count; inarg->flags = file->f_flags; req->in.h.opcode = opcode; - req->in.h.nodeid = get_node_id(inode); + req->in.h.nodeid = ff->nodeid; req->in.numargs = 1; req->in.args[0].size = sizeof(struct fuse_read_in); req->in.args[0].value = inarg; @@ -400,12 +400,12 @@ void fuse_read_fill(struct fuse_req *req, struct file *file, } static size_t fuse_send_read(struct fuse_req *req, struct file *file, - struct inode *inode, loff_t pos, size_t count, - fl_owner_t owner) + loff_t pos, size_t count, fl_owner_t owner) { - struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_file *ff = file->private_data; + struct fuse_conn *fc = ff->fc; - fuse_read_fill(req, file, inode, pos, count, FUSE_READ); + fuse_read_fill(req, file, pos, count, FUSE_READ); if (owner != NULL) { struct fuse_read_in *inarg = &req->misc.read.in; @@ -463,7 +463,7 @@ static int fuse_readpage(struct file *file, struct page *page) req->out.argpages = 1; req->num_pages = 1; req->pages[0] = page; - num_read = fuse_send_read(req, file, inode, pos, count, NULL); + num_read = fuse_send_read(req, file, pos, count, NULL); err = req->out.h.error; fuse_put_request(fc, req); @@ -512,19 +512,18 @@ static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req) fuse_file_put(req->ff); } -static void fuse_send_readpages(struct fuse_req *req, struct file *file, - struct inode *inode) +static void fuse_send_readpages(struct fuse_req *req, struct file *file) { - struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_file *ff = file->private_data; + struct fuse_conn *fc = ff->fc; loff_t pos = page_offset(req->pages[0]); size_t count = req->num_pages << PAGE_CACHE_SHIFT; req->out.argpages = 1; req->out.page_zeroing = 1; - fuse_read_fill(req, file, inode, pos, count, FUSE_READ); + fuse_read_fill(req, file, pos, count, FUSE_READ); req->misc.read.attr_ver = fuse_get_attr_version(fc); if (fc->async_read) { - struct fuse_file *ff = file->private_data; req->ff = fuse_file_get(ff); req->end = fuse_readpages_end; fuse_request_send_background(fc, req); @@ -554,7 +553,7 @@ static int fuse_readpages_fill(void *_data, struct page *page) (req->num_pages == FUSE_MAX_PAGES_PER_REQ || (req->num_pages + 1) * PAGE_CACHE_SIZE > fc->max_read || req->pages[req->num_pages - 1]->index + 1 != page->index)) { - fuse_send_readpages(req, data->file, inode); + fuse_send_readpages(req, data->file); data->req = req = fuse_get_req(fc); if (IS_ERR(req)) { unlock_page(page); @@ -588,7 +587,7 @@ static int fuse_readpages(struct file *file, struct address_space *mapping, err = read_cache_pages(mapping, pages, fuse_readpages_fill, &data); if (!err) { if (data.req->num_pages) - fuse_send_readpages(data.req, file, inode); + fuse_send_readpages(data.req, file); else fuse_put_request(fc, data.req); } @@ -616,9 +615,8 @@ static ssize_t fuse_file_aio_read(struct kiocb *iocb, const struct iovec *iov, } static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff, - struct inode *inode, loff_t pos, size_t count) + loff_t pos, size_t count) { - struct fuse_conn *fc = get_fuse_conn(inode); struct fuse_write_in *inarg = &req->misc.write.in; struct fuse_write_out *outarg = &req->misc.write.out; @@ -626,9 +624,9 @@ static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff, inarg->offset = pos; inarg->size = count; req->in.h.opcode = FUSE_WRITE; - req->in.h.nodeid = get_node_id(inode); + req->in.h.nodeid = ff->nodeid; req->in.numargs = 2; - if (fc->minor < 9) + if (ff->fc->minor < 9) req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE; else req->in.args[0].size = sizeof(struct fuse_write_in); @@ -640,13 +638,13 @@ static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff, } static size_t fuse_send_write(struct fuse_req *req, struct file *file, - struct inode *inode, loff_t pos, size_t count, - fl_owner_t owner) + loff_t pos, size_t count, fl_owner_t owner) { - struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_file *ff = file->private_data; + struct fuse_conn *fc = ff->fc; struct fuse_write_in *inarg = &req->misc.write.in; - fuse_write_fill(req, file->private_data, inode, pos, count); + fuse_write_fill(req, ff, pos, count); inarg->flags = file->f_flags; if (owner != NULL) { inarg->write_flags |= FUSE_WRITE_LOCKOWNER; @@ -706,7 +704,7 @@ static int fuse_buffered_write(struct file *file, struct inode *inode, req->num_pages = 1; req->pages[0] = page; req->page_offset = offset; - nres = fuse_send_write(req, file, inode, pos, count, NULL); + nres = fuse_send_write(req, file, pos, count, NULL); err = req->out.h.error; fuse_put_request(fc, req); if (!err && !nres) @@ -747,7 +745,7 @@ static size_t fuse_send_write_pages(struct fuse_req *req, struct file *file, for (i = 0; i < req->num_pages; i++) fuse_wait_on_page_writeback(inode, req->pages[i]->index); - res = fuse_send_write(req, file, inode, pos, count, NULL); + res = fuse_send_write(req, file, pos, count, NULL); offset = req->page_offset; count = res; @@ -988,8 +986,8 @@ static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf, static ssize_t fuse_direct_io(struct file *file, const char __user *buf, size_t count, loff_t *ppos, int write) { - struct inode *inode = file->f_path.dentry->d_inode; - struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_file *ff = file->private_data; + struct fuse_conn *fc = ff->fc; size_t nmax = write ? fc->max_write : fc->max_read; loff_t pos = *ppos; ssize_t res = 0; @@ -1001,6 +999,7 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf, while (count) { size_t nres; + fl_owner_t owner = current->files; size_t nbytes = min(count, nmax); int err = fuse_get_user_pages(req, buf, &nbytes, write); if (err) { @@ -1009,11 +1008,10 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf, } if (write) - nres = fuse_send_write(req, file, inode, pos, nbytes, - current->files); + nres = fuse_send_write(req, file, pos, nbytes, owner); else - nres = fuse_send_read(req, file, inode, pos, nbytes, - current->files); + nres = fuse_send_read(req, file, pos, nbytes, owner); + fuse_release_user_pages(req, !write); if (req->out.h.error) { if (!res) @@ -1196,7 +1194,7 @@ static int fuse_writepage_locked(struct page *page) req->ff = fuse_file_get(ff); spin_unlock(&fc->lock); - fuse_write_fill(req, ff, inode, page_offset(page), 0); + fuse_write_fill(req, ff, page_offset(page), 0); copy_highpage(tmp_page, page); req->misc.write.in.write_flags |= FUSE_WRITE_CACHE; diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index 4469d9971588..a51f63c7d423 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -520,7 +520,7 @@ void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req, * Initialize READ or READDIR request */ void fuse_read_fill(struct fuse_req *req, struct file *file, - struct inode *inode, loff_t pos, size_t count, int opcode); + loff_t pos, size_t count, int opcode); /** * Send OPEN or OPENDIR request -- cgit v1.2.3 From c7b7143c6342b8751d47b03a025ac5c0ac1ae809 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 28 Apr 2009 16:56:37 +0200 Subject: fuse: clean up args in fuse_finish_open() and fuse_release_fill() Move setting ff->fh, ff->nodeid and file->private_data outside fuse_finish_open(). Add ->open_flags member to struct fuse_file. This simplifies the argument passing to fuse_finish_open() and fuse_release_fill(), and paves the way for creating an open helper that doesn't need an inode pointer. Signed-off-by: Miklos Szeredi --- fs/fuse/dir.c | 16 +++++++++------- fs/fuse/file.c | 28 +++++++++++++++------------- fs/fuse/fuse_i.h | 9 ++++++--- 3 files changed, 30 insertions(+), 23 deletions(-) (limited to 'fs/fuse') diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index 222584b34ce4..da87a3d8a8ea 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -365,9 +365,9 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, * Synchronous release for the case when something goes wrong in CREATE_OPEN */ static void fuse_sync_release(struct fuse_conn *fc, struct fuse_file *ff, - u64 nodeid, int flags) + int flags) { - fuse_release_fill(ff, nodeid, flags, FUSE_RELEASE); + fuse_release_fill(ff, flags, FUSE_RELEASE); ff->reserved_req->force = 1; fuse_request_send(fc, ff->reserved_req); fuse_put_request(fc, ff->reserved_req); @@ -445,12 +445,14 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode, goto out_free_ff; fuse_put_request(fc, req); + ff->fh = outopen.fh; + ff->nodeid = outentry.nodeid; + ff->open_flags = outopen.open_flags; inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation, &outentry.attr, entry_attr_timeout(&outentry), 0); if (!inode) { flags &= ~(O_CREAT | O_EXCL | O_TRUNC); - ff->fh = outopen.fh; - fuse_sync_release(fc, ff, outentry.nodeid, flags); + fuse_sync_release(fc, ff, flags); fuse_send_forget(fc, forget_req, outentry.nodeid, 1); return -ENOMEM; } @@ -460,11 +462,11 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode, fuse_invalidate_attr(dir); file = lookup_instantiate_filp(nd, entry, generic_file_open); if (IS_ERR(file)) { - ff->fh = outopen.fh; - fuse_sync_release(fc, ff, outentry.nodeid, flags); + fuse_sync_release(fc, ff, flags); return PTR_ERR(file); } - fuse_finish_open(inode, file, ff, &outopen); + file->private_data = fuse_file_get(ff); + fuse_finish_open(inode, file); return 0; out_free_ff: diff --git a/fs/fuse/file.c b/fs/fuse/file.c index aa4a3876ca37..d9458cace425 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -79,7 +79,7 @@ void fuse_file_free(struct fuse_file *ff) kfree(ff); } -static struct fuse_file *fuse_file_get(struct fuse_file *ff) +struct fuse_file *fuse_file_get(struct fuse_file *ff) { atomic_inc(&ff->count); return ff; @@ -102,18 +102,16 @@ static void fuse_file_put(struct fuse_file *ff) } } -void fuse_finish_open(struct inode *inode, struct file *file, - struct fuse_file *ff, struct fuse_open_out *outarg) +void fuse_finish_open(struct inode *inode, struct file *file) { - if (outarg->open_flags & FOPEN_DIRECT_IO) + struct fuse_file *ff = file->private_data; + + if (ff->open_flags & FOPEN_DIRECT_IO) file->f_op = &fuse_direct_io_file_operations; - if (!(outarg->open_flags & FOPEN_KEEP_CACHE)) + if (!(ff->open_flags & FOPEN_KEEP_CACHE)) invalidate_inode_pages2(inode->i_mapping); - if (outarg->open_flags & FOPEN_NONSEEKABLE) + if (ff->open_flags & FOPEN_NONSEEKABLE) nonseekable_open(inode, file); - ff->fh = outarg->fh; - ff->nodeid = get_node_id(inode); - file->private_data = fuse_file_get(ff); } int fuse_open_common(struct inode *inode, struct file *file, int isdir) @@ -141,13 +139,17 @@ int fuse_open_common(struct inode *inode, struct file *file, int isdir) else { if (isdir) outarg.open_flags &= ~FOPEN_DIRECT_IO; - fuse_finish_open(inode, file, ff, &outarg); + ff->fh = outarg.fh; + ff->nodeid = get_node_id(inode); + ff->open_flags = outarg.open_flags; + file->private_data = fuse_file_get(ff); + fuse_finish_open(inode, file); } return err; } -void fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, int opcode) +void fuse_release_fill(struct fuse_file *ff, int flags, int opcode) { struct fuse_req *req = ff->reserved_req; struct fuse_release_in *inarg = &req->misc.release.in; @@ -155,7 +157,7 @@ void fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, int opcode) inarg->fh = ff->fh; inarg->flags = flags; req->in.h.opcode = opcode; - req->in.h.nodeid = nodeid; + req->in.h.nodeid = ff->nodeid; req->in.numargs = 1; req->in.args[0].size = sizeof(struct fuse_release_in); req->in.args[0].value = inarg; @@ -174,7 +176,7 @@ int fuse_release_common(struct inode *inode, struct file *file, int isdir) fc = get_fuse_conn(inode); req = ff->reserved_req; - fuse_release_fill(ff, get_node_id(inode), file->f_flags, + fuse_release_fill(ff, file->f_flags, isdir ? FUSE_RELEASEDIR : FUSE_RELEASE); /* Hold vfsmount and dentry until release is finished */ diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index a51f63c7d423..ce46c120f48a 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -119,6 +119,9 @@ struct fuse_file { /** Refcount */ atomic_t count; + /** FOPEN_* flags returned by open */ + u32 open_flags; + /** Entry on inode's write_files list */ struct list_head write_entry; @@ -528,12 +531,12 @@ void fuse_read_fill(struct fuse_req *req, struct file *file, int fuse_open_common(struct inode *inode, struct file *file, int isdir); struct fuse_file *fuse_file_alloc(struct fuse_conn *fc); +struct fuse_file *fuse_file_get(struct fuse_file *ff); void fuse_file_free(struct fuse_file *ff); -void fuse_finish_open(struct inode *inode, struct file *file, - struct fuse_file *ff, struct fuse_open_out *outarg); +void fuse_finish_open(struct inode *inode, struct file *file); /** Fill in ff->reserved_req with a RELEASE request */ -void fuse_release_fill(struct fuse_file *ff, u64 nodeid, int flags, int opcode); +void fuse_release_fill(struct fuse_file *ff, int flags, int opcode); /** * Send RELEASE or RELEASEDIR request -- cgit v1.2.3 From 91fe96b403f8a0a4a8a045a39b1bd549b0da7941 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 28 Apr 2009 16:56:37 +0200 Subject: fuse: create fuse_do_open() helper for CUSE Create a helper for sending an OPEN request that doesn't need a struct inode pointer. Signed-off-by: Miklos Szeredi --- fs/fuse/dir.c | 2 +- fs/fuse/file.c | 65 ++++++++++++++++++++++++++++++++++---------------------- fs/fuse/fuse_i.h | 2 +- 3 files changed, 42 insertions(+), 27 deletions(-) (limited to 'fs/fuse') diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index da87a3d8a8ea..faa3b2f86740 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -1103,7 +1103,7 @@ static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c) static int fuse_dir_open(struct inode *inode, struct file *file) { - return fuse_open_common(inode, file, 1); + return fuse_open_common(inode, file, true); } static int fuse_dir_release(struct inode *inode, struct file *file) diff --git a/fs/fuse/file.c b/fs/fuse/file.c index d9458cace425..6bdaa55ae613 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -15,10 +15,9 @@ static const struct file_operations fuse_direct_io_file_operations; -static int fuse_send_open(struct inode *inode, struct file *file, int isdir, - struct fuse_open_out *outargp) +static int fuse_send_open(struct fuse_conn *fc, u64 nodeid, struct file *file, + int opcode, struct fuse_open_out *outargp) { - struct fuse_conn *fc = get_fuse_conn(inode); struct fuse_open_in inarg; struct fuse_req *req; int err; @@ -31,8 +30,8 @@ static int fuse_send_open(struct inode *inode, struct file *file, int isdir, inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY); if (!fc->atomic_o_trunc) inarg.flags &= ~O_TRUNC; - req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; - req->in.h.nodeid = get_node_id(inode); + req->in.h.opcode = opcode; + req->in.h.nodeid = nodeid; req->in.numargs = 1; req->in.args[0].size = sizeof(inarg); req->in.args[0].value = &inarg; @@ -102,6 +101,35 @@ static void fuse_file_put(struct fuse_file *ff) } } +static int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, + bool isdir) +{ + struct fuse_open_out outarg; + struct fuse_file *ff; + int err; + int opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN; + + ff = fuse_file_alloc(fc); + if (!ff) + return -ENOMEM; + + err = fuse_send_open(fc, nodeid, file, opcode, &outarg); + if (err) { + fuse_file_free(ff); + return err; + } + + if (isdir) + outarg.open_flags &= ~FOPEN_DIRECT_IO; + + ff->fh = outarg.fh; + ff->nodeid = nodeid; + ff->open_flags = outarg.open_flags; + file->private_data = fuse_file_get(ff); + + return 0; +} + void fuse_finish_open(struct inode *inode, struct file *file) { struct fuse_file *ff = file->private_data; @@ -114,11 +142,9 @@ void fuse_finish_open(struct inode *inode, struct file *file) nonseekable_open(inode, file); } -int fuse_open_common(struct inode *inode, struct file *file, int isdir) +int fuse_open_common(struct inode *inode, struct file *file, bool isdir) { struct fuse_conn *fc = get_fuse_conn(inode); - struct fuse_open_out outarg; - struct fuse_file *ff; int err; /* VFS checks this, but only _after_ ->open() */ @@ -129,24 +155,13 @@ int fuse_open_common(struct inode *inode, struct file *file, int isdir) if (err) return err; - ff = fuse_file_alloc(fc); - if (!ff) - return -ENOMEM; - - err = fuse_send_open(inode, file, isdir, &outarg); + err = fuse_do_open(fc, get_node_id(inode), file, isdir); if (err) - fuse_file_free(ff); - else { - if (isdir) - outarg.open_flags &= ~FOPEN_DIRECT_IO; - ff->fh = outarg.fh; - ff->nodeid = get_node_id(inode); - ff->open_flags = outarg.open_flags; - file->private_data = fuse_file_get(ff); - fuse_finish_open(inode, file); - } + return err; - return err; + fuse_finish_open(inode, file); + + return 0; } void fuse_release_fill(struct fuse_file *ff, int flags, int opcode) @@ -201,7 +216,7 @@ int fuse_release_common(struct inode *inode, struct file *file, int isdir) static int fuse_open(struct inode *inode, struct file *file) { - return fuse_open_common(inode, file, 0); + return fuse_open_common(inode, file, false); } static int fuse_release(struct inode *inode, struct file *file) diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index ce46c120f48a..429e669d7859 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -528,7 +528,7 @@ void fuse_read_fill(struct fuse_req *req, struct file *file, /** * Send OPEN or OPENDIR request */ -int fuse_open_common(struct inode *inode, struct file *file, int isdir); +int fuse_open_common(struct inode *inode, struct file *file, bool isdir); struct fuse_file *fuse_file_alloc(struct fuse_conn *fc); struct fuse_file *fuse_file_get(struct fuse_file *ff); -- cgit v1.2.3 From 8b0797a4984de4406de25808e1a424344de543e4 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 28 Apr 2009 16:56:39 +0200 Subject: fuse: don't use inode in fuse_sync_release() Make fuse_sync_release() a generic helper function that doesn't need a struct inode pointer. This makes it suitable for use by CUSE. Change return value of fuse_release_common() from int to void. Signed-off-by: Miklos Szeredi --- fs/fuse/dir.c | 21 +++++---------------- fs/fuse/file.c | 49 +++++++++++++++++++++++++++++-------------------- fs/fuse/fuse_i.h | 5 ++--- 3 files changed, 36 insertions(+), 39 deletions(-) (limited to 'fs/fuse') diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index faa3b2f86740..b3089a083d30 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -361,19 +361,6 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry, return ERR_PTR(err); } -/* - * Synchronous release for the case when something goes wrong in CREATE_OPEN - */ -static void fuse_sync_release(struct fuse_conn *fc, struct fuse_file *ff, - int flags) -{ - fuse_release_fill(ff, flags, FUSE_RELEASE); - ff->reserved_req->force = 1; - fuse_request_send(fc, ff->reserved_req); - fuse_put_request(fc, ff->reserved_req); - kfree(ff); -} - /* * Atomic create+open operation * @@ -452,7 +439,7 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode, &outentry.attr, entry_attr_timeout(&outentry), 0); if (!inode) { flags &= ~(O_CREAT | O_EXCL | O_TRUNC); - fuse_sync_release(fc, ff, flags); + fuse_sync_release(ff, flags); fuse_send_forget(fc, forget_req, outentry.nodeid, 1); return -ENOMEM; } @@ -462,7 +449,7 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode, fuse_invalidate_attr(dir); file = lookup_instantiate_filp(nd, entry, generic_file_open); if (IS_ERR(file)) { - fuse_sync_release(fc, ff, flags); + fuse_sync_release(ff, flags); return PTR_ERR(file); } file->private_data = fuse_file_get(ff); @@ -1108,7 +1095,9 @@ static int fuse_dir_open(struct inode *inode, struct file *file) static int fuse_dir_release(struct inode *inode, struct file *file) { - return fuse_release_common(inode, file, 1); + fuse_release_common(file, FUSE_RELEASEDIR); + + return 0; } static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync) diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 6bdaa55ae613..ab627b40c3ea 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -93,10 +93,9 @@ static void fuse_file_put(struct fuse_file *ff) { if (atomic_dec_and_test(&ff->count)) { struct fuse_req *req = ff->reserved_req; - struct inode *inode = req->misc.release.path.dentry->d_inode; - struct fuse_conn *fc = get_fuse_conn(inode); + req->end = fuse_release_end; - fuse_request_send_background(fc, req); + fuse_request_send_background(ff->fc, req); kfree(ff); } } @@ -164,11 +163,20 @@ int fuse_open_common(struct inode *inode, struct file *file, bool isdir) return 0; } -void fuse_release_fill(struct fuse_file *ff, int flags, int opcode) +static void fuse_prepare_release(struct fuse_file *ff, int flags, int opcode) { + struct fuse_conn *fc = ff->fc; struct fuse_req *req = ff->reserved_req; struct fuse_release_in *inarg = &req->misc.release.in; + spin_lock(&fc->lock); + list_del(&ff->write_entry); + if (!RB_EMPTY_NODE(&ff->polled_node)) + rb_erase(&ff->polled_node, &fc->polled_files); + spin_unlock(&fc->lock); + + wake_up_interruptible_sync(&ff->poll_wait); + inarg->fh = ff->fh; inarg->flags = flags; req->in.h.opcode = opcode; @@ -178,40 +186,28 @@ void fuse_release_fill(struct fuse_file *ff, int flags, int opcode) req->in.args[0].value = inarg; } -int fuse_release_common(struct inode *inode, struct file *file, int isdir) +void fuse_release_common(struct file *file, int opcode) { - struct fuse_conn *fc; struct fuse_file *ff; struct fuse_req *req; ff = file->private_data; if (unlikely(!ff)) - return 0; /* return value is ignored by VFS */ + return; - fc = get_fuse_conn(inode); req = ff->reserved_req; - - fuse_release_fill(ff, file->f_flags, - isdir ? FUSE_RELEASEDIR : FUSE_RELEASE); + fuse_prepare_release(ff, file->f_flags, opcode); /* Hold vfsmount and dentry until release is finished */ path_get(&file->f_path); req->misc.release.path = file->f_path; - spin_lock(&fc->lock); - list_del(&ff->write_entry); - if (!RB_EMPTY_NODE(&ff->polled_node)) - rb_erase(&ff->polled_node, &fc->polled_files); - spin_unlock(&fc->lock); - - wake_up_interruptible_sync(&ff->poll_wait); /* * Normally this will send the RELEASE request, however if * some asynchronous READ or WRITE requests are outstanding, * the sending will be delayed. */ fuse_file_put(ff); - return 0; } static int fuse_open(struct inode *inode, struct file *file) @@ -221,7 +217,20 @@ static int fuse_open(struct inode *inode, struct file *file) static int fuse_release(struct inode *inode, struct file *file) { - return fuse_release_common(inode, file, 0); + fuse_release_common(file, FUSE_RELEASE); + + /* return value is ignored by VFS */ + return 0; +} + +void fuse_sync_release(struct fuse_file *ff, int flags) +{ + WARN_ON(atomic_read(&ff->count) > 1); + fuse_prepare_release(ff, flags, FUSE_RELEASE); + ff->reserved_req->force = 1; + fuse_request_send(ff->fc, ff->reserved_req); + fuse_put_request(ff->fc, ff->reserved_req); + kfree(ff); } /* diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index 429e669d7859..ef2e1f3780b5 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -535,13 +535,12 @@ struct fuse_file *fuse_file_get(struct fuse_file *ff); void fuse_file_free(struct fuse_file *ff); void fuse_finish_open(struct inode *inode, struct file *file); -/** Fill in ff->reserved_req with a RELEASE request */ -void fuse_release_fill(struct fuse_file *ff, int flags, int opcode); +void fuse_sync_release(struct fuse_file *ff, int flags); /** * Send RELEASE or RELEASEDIR request */ -int fuse_release_common(struct inode *inode, struct file *file, int isdir); +void fuse_release_common(struct file *file, int opcode); /** * Send FSYNC or FSYNCDIR request -- cgit v1.2.3 From d36f248710c05714f37d921258b630bd1456b99f Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 28 Apr 2009 16:56:39 +0200 Subject: fuse: don't use inode in fuse_do_ioctl() helper Create a helper for sending an IOCTL request that doesn't use a struct inode. This prepares this function for use by CUSE, where the inode is not owned by a fuse filesystem. Signed-off-by: Miklos Szeredi --- fs/fuse/file.c | 35 +++++++++++++++++++++-------------- 1 file changed, 21 insertions(+), 14 deletions(-) (limited to 'fs/fuse') diff --git a/fs/fuse/file.c b/fs/fuse/file.c index ab627b40c3ea..9f0ade0b4ce8 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -1647,12 +1647,11 @@ static int fuse_ioctl_copy_user(struct page **pages, struct iovec *iov, * limits ioctl data transfers to well-formed ioctls and is the forced * behavior for all FUSE servers. */ -static long fuse_file_do_ioctl(struct file *file, unsigned int cmd, - unsigned long arg, unsigned int flags) +static long fuse_do_ioctl(struct file *file, unsigned int cmd, + unsigned long arg, unsigned int flags) { - struct inode *inode = file->f_dentry->d_inode; struct fuse_file *ff = file->private_data; - struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_conn *fc = ff->fc; struct fuse_ioctl_in inarg = { .fh = ff->fh, .cmd = cmd, @@ -1671,13 +1670,6 @@ static long fuse_file_do_ioctl(struct file *file, unsigned int cmd, /* assume all the iovs returned by client always fits in a page */ BUILD_BUG_ON(sizeof(struct iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE); - if (!fuse_allow_task(fc, current)) - return -EACCES; - - err = -EIO; - if (is_bad_inode(inode)) - goto out; - err = -ENOMEM; pages = kzalloc(sizeof(pages[0]) * FUSE_MAX_PAGES_PER_REQ, GFP_KERNEL); iov_page = alloc_page(GFP_KERNEL); @@ -1738,7 +1730,7 @@ static long fuse_file_do_ioctl(struct file *file, unsigned int cmd, /* okay, let's send it to the client */ req->in.h.opcode = FUSE_IOCTL; - req->in.h.nodeid = get_node_id(inode); + req->in.h.nodeid = ff->nodeid; req->in.numargs = 1; req->in.args[0].size = sizeof(inarg); req->in.args[0].value = &inarg; @@ -1822,16 +1814,31 @@ static long fuse_file_do_ioctl(struct file *file, unsigned int cmd, return err ? err : outarg.result; } +static long fuse_file_ioctl_common(struct file *file, unsigned int cmd, + unsigned long arg, unsigned int flags) +{ + struct inode *inode = file->f_dentry->d_inode; + struct fuse_conn *fc = get_fuse_conn(inode); + + if (!fuse_allow_task(fc, current)) + return -EACCES; + + if (is_bad_inode(inode)) + return -EIO; + + return fuse_do_ioctl(file, cmd, arg, flags); +} + static long fuse_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { - return fuse_file_do_ioctl(file, cmd, arg, 0); + return fuse_file_ioctl_common(file, cmd, arg, 0); } static long fuse_file_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { - return fuse_file_do_ioctl(file, cmd, arg, FUSE_IOCTL_COMPAT); + return fuse_file_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT); } /* -- cgit v1.2.3 From 797759aaf31351a1ab1b9130c4f180ce496f46c5 Mon Sep 17 00:00:00 2001 From: Miklos Szeredi Date: Tue, 28 Apr 2009 16:56:41 +0200 Subject: fuse: don't use inode in fuse_file_poll Use ff->fc and ff->nodeid instead of file->f_dentry->d_inode in the fuse_file_poll() implementation. This prepares this function for use by CUSE, where the inode is not owned by a fuse filesystem. Signed-off-by: Miklos Szeredi --- fs/fuse/file.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'fs/fuse') diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 9f0ade0b4ce8..c5de60e873cb 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -1894,9 +1894,8 @@ static void fuse_register_polled_file(struct fuse_conn *fc, static unsigned fuse_file_poll(struct file *file, poll_table *wait) { - struct inode *inode = file->f_dentry->d_inode; struct fuse_file *ff = file->private_data; - struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_conn *fc = ff->fc; struct fuse_poll_in inarg = { .fh = ff->fh, .kh = ff->kh }; struct fuse_poll_out outarg; struct fuse_req *req; @@ -1921,7 +1920,7 @@ static unsigned fuse_file_poll(struct file *file, poll_table *wait) return PTR_ERR(req); req->in.h.opcode = FUSE_POLL; - req->in.h.nodeid = get_node_id(inode); + req->in.h.nodeid = ff->nodeid; req->in.numargs = 1; req->in.args[0].size = sizeof(inarg); req->in.args[0].value = &inarg; -- cgit v1.2.3 From a325f9b92273d6c64ec56167905b951b9827ec33 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 14 Apr 2009 10:54:52 +0900 Subject: fuse: update fuse_conn_init() and separate out fuse_conn_kill() Update fuse_conn_init() such that it doesn't take @sb and move bdi registration into a separate function. Also separate out fuse_conn_kill() from fuse_put_super(). These will be used to implement cuse. Signed-off-by: Tejun Heo Signed-off-by: Miklos Szeredi --- fs/fuse/dev.c | 5 ++- fs/fuse/fuse_i.h | 5 ++- fs/fuse/inode.c | 115 +++++++++++++++++++++++++++++++------------------------ 3 files changed, 72 insertions(+), 53 deletions(-) (limited to 'fs/fuse') diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index ba76b68c52ff..368189fd4056 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -282,7 +282,7 @@ __releases(&fc->lock) wake_up_all(&fc->blocked_waitq); } if (fc->num_background == FUSE_CONGESTION_THRESHOLD && - fc->connected) { + fc->connected && fc->bdi_initialized) { clear_bdi_congested(&fc->bdi, READ); clear_bdi_congested(&fc->bdi, WRITE); } @@ -408,7 +408,8 @@ static void fuse_request_send_nowait_locked(struct fuse_conn *fc, fc->num_background++; if (fc->num_background == FUSE_MAX_BACKGROUND) fc->blocked = 1; - if (fc->num_background == FUSE_CONGESTION_THRESHOLD) { + if (fc->num_background == FUSE_CONGESTION_THRESHOLD && + fc->bdi_initialized) { set_bdi_congested(&fc->bdi, READ); set_bdi_congested(&fc->bdi, WRITE); } diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index ef2e1f3780b5..2efcf12b763a 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -394,6 +394,9 @@ struct fuse_conn { /** Filesystem supports NFS exporting. Only set in INIT */ unsigned export_support:1; + /** Set if bdi is valid */ + unsigned bdi_initialized:1; + /* * The following bitfields are only for optimization purposes * and hence races in setting them will not cause malfunction @@ -662,7 +665,7 @@ struct fuse_conn *fuse_conn_get(struct fuse_conn *fc); /** * Initialize fuse_conn */ -int fuse_conn_init(struct fuse_conn *fc, struct super_block *sb); +void fuse_conn_init(struct fuse_conn *fc); /** * Release reference to fuse_conn diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 75ca5ac603ae..fea7c1064d30 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -274,11 +274,14 @@ static void fuse_send_destroy(struct fuse_conn *fc) } } -static void fuse_put_super(struct super_block *sb) +static void fuse_bdi_destroy(struct fuse_conn *fc) { - struct fuse_conn *fc = get_fuse_conn_super(sb); + if (fc->bdi_initialized) + bdi_destroy(&fc->bdi); +} - fuse_send_destroy(fc); +static void fuse_conn_kill(struct fuse_conn *fc) +{ spin_lock(&fc->lock); fc->connected = 0; fc->blocked = 0; @@ -292,7 +295,15 @@ static void fuse_put_super(struct super_block *sb) list_del(&fc->entry); fuse_ctl_remove_conn(fc); mutex_unlock(&fuse_mutex); - bdi_destroy(&fc->bdi); + fuse_bdi_destroy(fc); +} + +static void fuse_put_super(struct super_block *sb) +{ + struct fuse_conn *fc = get_fuse_conn_super(sb); + + fuse_send_destroy(fc); + fuse_conn_kill(fc); fuse_conn_put(fc); } @@ -463,10 +474,8 @@ static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt) return 0; } -int fuse_conn_init(struct fuse_conn *fc, struct super_block *sb) +void fuse_conn_init(struct fuse_conn *fc) { - int err; - memset(fc, 0, sizeof(*fc)); spin_lock_init(&fc->lock); mutex_init(&fc->inst_mutex); @@ -481,49 +490,12 @@ int fuse_conn_init(struct fuse_conn *fc, struct super_block *sb) INIT_LIST_HEAD(&fc->bg_queue); INIT_LIST_HEAD(&fc->entry); atomic_set(&fc->num_waiting, 0); - fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; - fc->bdi.unplug_io_fn = default_unplug_io_fn; - /* fuse does it's own writeback accounting */ - fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB; fc->khctr = 0; fc->polled_files = RB_ROOT; - fc->dev = sb->s_dev; - err = bdi_init(&fc->bdi); - if (err) - goto error_mutex_destroy; - if (sb->s_bdev) { - err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk", - MAJOR(fc->dev), MINOR(fc->dev)); - } else { - err = bdi_register_dev(&fc->bdi, fc->dev); - } - if (err) - goto error_bdi_destroy; - /* - * For a single fuse filesystem use max 1% of dirty + - * writeback threshold. - * - * This gives about 1M of write buffer for memory maps on a - * machine with 1G and 10% dirty_ratio, which should be more - * than enough. - * - * Privileged users can raise it by writing to - * - * /sys/class/bdi//max_ratio - */ - bdi_set_max_ratio(&fc->bdi, 1); fc->reqctr = 0; fc->blocked = 1; fc->attr_version = 1; get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); - - return 0; - - error_bdi_destroy: - bdi_destroy(&fc->bdi); - error_mutex_destroy: - mutex_destroy(&fc->inst_mutex); - return err; } EXPORT_SYMBOL_GPL(fuse_conn_init); @@ -794,6 +766,48 @@ static void fuse_free_conn(struct fuse_conn *fc) kfree(fc); } +static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb) +{ + int err; + + fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE; + fc->bdi.unplug_io_fn = default_unplug_io_fn; + /* fuse does it's own writeback accounting */ + fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB; + + err = bdi_init(&fc->bdi); + if (err) + return err; + + fc->bdi_initialized = 1; + + if (sb->s_bdev) { + err = bdi_register(&fc->bdi, NULL, "%u:%u-fuseblk", + MAJOR(fc->dev), MINOR(fc->dev)); + } else { + err = bdi_register_dev(&fc->bdi, fc->dev); + } + + if (err) + return err; + + /* + * For a single fuse filesystem use max 1% of dirty + + * writeback threshold. + * + * This gives about 1M of write buffer for memory maps on a + * machine with 1G and 10% dirty_ratio, which should be more + * than enough. + * + * Privileged users can raise it by writing to + * + * /sys/class/bdi//max_ratio + */ + bdi_set_max_ratio(&fc->bdi, 1); + + return 0; +} + static int fuse_fill_super(struct super_block *sb, void *data, int silent) { struct fuse_conn *fc; @@ -840,11 +854,12 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent) if (!fc) goto err_fput; - err = fuse_conn_init(fc, sb); - if (err) { - kfree(fc); - goto err_fput; - } + fuse_conn_init(fc); + + fc->dev = sb->s_dev; + err = fuse_bdi_init(fc, sb); + if (err) + goto err_put_conn; fc->release = fuse_free_conn; fc->flags = d.flags; @@ -908,7 +923,7 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent) err_put_root: dput(root_dentry); err_put_conn: - bdi_destroy(&fc->bdi); + fuse_bdi_destroy(fc); fuse_conn_put(fc); err_fput: fput(file); -- cgit v1.2.3 From 08cbf542bf24fb0481a54526b177347ae4046f5e Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 14 Apr 2009 10:54:53 +0900 Subject: fuse: export symbols to be used by CUSE Export the following symbols for CUSE. fuse_conn_put() fuse_conn_get() fuse_conn_kill() fuse_send_init() fuse_do_open() fuse_sync_release() fuse_direct_io() fuse_do_ioctl() fuse_file_poll() fuse_request_alloc() fuse_get_req() fuse_put_request() fuse_request_send() fuse_abort_conn() fuse_dev_release() fuse_dev_operations Signed-off-by: Tejun Heo Signed-off-by: Miklos Szeredi --- fs/fuse/dev.c | 10 +++++++++- fs/fuse/file.c | 20 +++++++++++++------- fs/fuse/fuse_i.h | 13 +++++++++++++ fs/fuse/inode.c | 5 ++++- 4 files changed, 39 insertions(+), 9 deletions(-) (limited to 'fs/fuse') diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index 368189fd4056..8fed2ed12f38 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -46,6 +46,7 @@ struct fuse_req *fuse_request_alloc(void) fuse_request_init(req); return req; } +EXPORT_SYMBOL_GPL(fuse_request_alloc); struct fuse_req *fuse_request_alloc_nofs(void) { @@ -124,6 +125,7 @@ struct fuse_req *fuse_get_req(struct fuse_conn *fc) atomic_dec(&fc->num_waiting); return ERR_PTR(err); } +EXPORT_SYMBOL_GPL(fuse_get_req); /* * Return request in fuse_file->reserved_req. However that may @@ -208,6 +210,7 @@ void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req) fuse_request_free(req); } } +EXPORT_SYMBOL_GPL(fuse_put_request); static unsigned len_args(unsigned numargs, struct fuse_arg *args) { @@ -400,6 +403,7 @@ void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req) } spin_unlock(&fc->lock); } +EXPORT_SYMBOL_GPL(fuse_request_send); static void fuse_request_send_nowait_locked(struct fuse_conn *fc, struct fuse_req *req) @@ -440,6 +444,7 @@ void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req) req->isreply = 1; fuse_request_send_nowait(fc, req); } +EXPORT_SYMBOL_GPL(fuse_request_send_background); /* * Called under fc->lock @@ -1106,8 +1111,9 @@ void fuse_abort_conn(struct fuse_conn *fc) } spin_unlock(&fc->lock); } +EXPORT_SYMBOL_GPL(fuse_abort_conn); -static int fuse_dev_release(struct inode *inode, struct file *file) +int fuse_dev_release(struct inode *inode, struct file *file) { struct fuse_conn *fc = fuse_get_conn(file); if (fc) { @@ -1121,6 +1127,7 @@ static int fuse_dev_release(struct inode *inode, struct file *file) return 0; } +EXPORT_SYMBOL_GPL(fuse_dev_release); static int fuse_dev_fasync(int fd, struct file *file, int on) { @@ -1143,6 +1150,7 @@ const struct file_operations fuse_dev_operations = { .release = fuse_dev_release, .fasync = fuse_dev_fasync, }; +EXPORT_SYMBOL_GPL(fuse_dev_operations); static struct miscdevice fuse_miscdevice = { .minor = FUSE_MINOR, diff --git a/fs/fuse/file.c b/fs/fuse/file.c index c5de60e873cb..fce6ce694fde 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -12,6 +12,7 @@ #include #include #include +#include static const struct file_operations fuse_direct_io_file_operations; @@ -100,8 +101,8 @@ static void fuse_file_put(struct fuse_file *ff) } } -static int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, - bool isdir) +int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, + bool isdir) { struct fuse_open_out outarg; struct fuse_file *ff; @@ -128,6 +129,7 @@ static int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, return 0; } +EXPORT_SYMBOL_GPL(fuse_do_open); void fuse_finish_open(struct inode *inode, struct file *file) { @@ -232,6 +234,7 @@ void fuse_sync_release(struct fuse_file *ff, int flags) fuse_put_request(ff->fc, ff->reserved_req); kfree(ff); } +EXPORT_SYMBOL_GPL(fuse_sync_release); /* * Scramble the ID space with XTEA, so that the value of the files_struct @@ -1009,8 +1012,8 @@ static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf, return 0; } -static ssize_t fuse_direct_io(struct file *file, const char __user *buf, - size_t count, loff_t *ppos, int write) +ssize_t fuse_direct_io(struct file *file, const char __user *buf, + size_t count, loff_t *ppos, int write) { struct fuse_file *ff = file->private_data; struct fuse_conn *fc = ff->fc; @@ -1066,6 +1069,7 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf, return res; } +EXPORT_SYMBOL_GPL(fuse_direct_io); static ssize_t fuse_direct_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) @@ -1647,8 +1651,8 @@ static int fuse_ioctl_copy_user(struct page **pages, struct iovec *iov, * limits ioctl data transfers to well-formed ioctls and is the forced * behavior for all FUSE servers. */ -static long fuse_do_ioctl(struct file *file, unsigned int cmd, - unsigned long arg, unsigned int flags) +long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, + unsigned int flags) { struct fuse_file *ff = file->private_data; struct fuse_conn *fc = ff->fc; @@ -1813,6 +1817,7 @@ static long fuse_do_ioctl(struct file *file, unsigned int cmd, return err ? err : outarg.result; } +EXPORT_SYMBOL_GPL(fuse_do_ioctl); static long fuse_file_ioctl_common(struct file *file, unsigned int cmd, unsigned long arg, unsigned int flags) @@ -1892,7 +1897,7 @@ static void fuse_register_polled_file(struct fuse_conn *fc, spin_unlock(&fc->lock); } -static unsigned fuse_file_poll(struct file *file, poll_table *wait) +unsigned fuse_file_poll(struct file *file, poll_table *wait) { struct fuse_file *ff = file->private_data; struct fuse_conn *fc = ff->fc; @@ -1939,6 +1944,7 @@ static unsigned fuse_file_poll(struct file *file, poll_table *wait) } return POLLERR; } +EXPORT_SYMBOL_GPL(fuse_file_poll); /* * This is called from fuse_handle_notify() on FUSE_NOTIFY_POLL and diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index 2efcf12b763a..aaf2f9ff970e 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -261,6 +261,8 @@ struct fuse_req { } release; struct fuse_init_in init_in; struct fuse_init_out init_out; + struct cuse_init_in cuse_init_in; + struct cuse_init_out cuse_init_out; struct { struct fuse_read_in in; u64 attr_ver; @@ -662,6 +664,8 @@ void fuse_invalidate_entry_cache(struct dentry *entry); */ struct fuse_conn *fuse_conn_get(struct fuse_conn *fc); +void fuse_conn_kill(struct fuse_conn *fc); + /** * Initialize fuse_conn */ @@ -704,4 +708,13 @@ void fuse_release_nowrite(struct inode *inode); u64 fuse_get_attr_version(struct fuse_conn *fc); +int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file, + bool isdir); +ssize_t fuse_direct_io(struct file *file, const char __user *buf, + size_t count, loff_t *ppos, int write); +long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg, + unsigned int flags); +unsigned fuse_file_poll(struct file *file, poll_table *wait); +int fuse_dev_release(struct inode *inode, struct file *file); + #endif /* _FS_FUSE_I_H */ diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index fea7c1064d30..d8673ccf90b7 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -280,7 +280,7 @@ static void fuse_bdi_destroy(struct fuse_conn *fc) bdi_destroy(&fc->bdi); } -static void fuse_conn_kill(struct fuse_conn *fc) +void fuse_conn_kill(struct fuse_conn *fc) { spin_lock(&fc->lock); fc->connected = 0; @@ -297,6 +297,7 @@ static void fuse_conn_kill(struct fuse_conn *fc) mutex_unlock(&fuse_mutex); fuse_bdi_destroy(fc); } +EXPORT_SYMBOL_GPL(fuse_conn_kill); static void fuse_put_super(struct super_block *sb) { @@ -508,12 +509,14 @@ void fuse_conn_put(struct fuse_conn *fc) fc->release(fc); } } +EXPORT_SYMBOL_GPL(fuse_conn_put); struct fuse_conn *fuse_conn_get(struct fuse_conn *fc) { atomic_inc(&fc->count); return fc; } +EXPORT_SYMBOL_GPL(fuse_conn_get); static struct inode *fuse_get_root_inode(struct super_block *sb, unsigned mode) { -- cgit v1.2.3 From 151060ac13144208bd7601d17e4c92c59b98072f Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Tue, 14 Apr 2009 10:54:54 +0900 Subject: CUSE: implement CUSE - Character device in Userspace CUSE enables implementing character devices in userspace. With recent additions of ioctl and poll support, FUSE already has most of what's necessary to implement character devices. All CUSE has to do is bonding all those components - FUSE, chardev and the driver model - nicely. When client opens /dev/cuse, kernel starts conversation with CUSE_INIT. The client tells CUSE which device it wants to create. As the previous patch made fuse_file usable without associated fuse_inode, CUSE doesn't create super block or inodes. It attaches fuse_file to cdev file->private_data during open and set ff->fi to NULL. The rest of the operation is almost identical to FUSE direct IO case. Each CUSE device has a corresponding directory /sys/class/cuse/DEVNAME (which is symlink to /sys/devices/virtual/class/DEVNAME if SYSFS_DEPRECATED is turned off) which hosts "waiting" and "abort" among other things. Those two files have the same meaning as the FUSE control files. The only notable lacking feature compared to in-kernel implementation is mmap support. Signed-off-by: Tejun Heo Signed-off-by: Miklos Szeredi --- fs/fuse/Makefile | 1 + fs/fuse/cuse.c | 610 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 611 insertions(+) create mode 100644 fs/fuse/cuse.c (limited to 'fs/fuse') diff --git a/fs/fuse/Makefile b/fs/fuse/Makefile index 72437065f6ad..e95eeb445e58 100644 --- a/fs/fuse/Makefile +++ b/fs/fuse/Makefile @@ -3,5 +3,6 @@ # obj-$(CONFIG_FUSE_FS) += fuse.o +obj-$(CONFIG_CUSE) += cuse.o fuse-objs := dev.o dir.o file.o inode.o control.o diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c new file mode 100644 index 000000000000..de792dcf3274 --- /dev/null +++ b/fs/fuse/cuse.c @@ -0,0 +1,610 @@ +/* + * CUSE: Character device in Userspace + * + * Copyright (C) 2008-2009 SUSE Linux Products GmbH + * Copyright (C) 2008-2009 Tejun Heo + * + * This file is released under the GPLv2. + * + * CUSE enables character devices to be implemented from userland much + * like FUSE allows filesystems. On initialization /dev/cuse is + * created. By opening the file and replying to the CUSE_INIT request + * userland CUSE server can create a character device. After that the + * operation is very similar to FUSE. + * + * A CUSE instance involves the following objects. + * + * cuse_conn : contains fuse_conn and serves as bonding structure + * channel : file handle connected to the userland CUSE server + * cdev : the implemented character device + * dev : generic device for cdev + * + * Note that 'channel' is what 'dev' is in FUSE. As CUSE deals with + * devices, it's called 'channel' to reduce confusion. + * + * channel determines when the character device dies. When channel is + * closed, everything begins to destruct. The cuse_conn is taken off + * the lookup table preventing further access from cdev, cdev and + * generic device are removed and the base reference of cuse_conn is + * put. + * + * On each open, the matching cuse_conn is looked up and if found an + * additional reference is taken which is released when the file is + * closed. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "fuse_i.h" + +#define CUSE_CONNTBL_LEN 64 + +struct cuse_conn { + struct list_head list; /* linked on cuse_conntbl */ + struct fuse_conn fc; /* fuse connection */ + struct cdev *cdev; /* associated character device */ + struct device *dev; /* device representing @cdev */ + + /* init parameters, set once during initialization */ + bool unrestricted_ioctl; +}; + +static DEFINE_SPINLOCK(cuse_lock); /* protects cuse_conntbl */ +static struct list_head cuse_conntbl[CUSE_CONNTBL_LEN]; +static struct class *cuse_class; + +static struct cuse_conn *fc_to_cc(struct fuse_conn *fc) +{ + return container_of(fc, struct cuse_conn, fc); +} + +static struct list_head *cuse_conntbl_head(dev_t devt) +{ + return &cuse_conntbl[(MAJOR(devt) + MINOR(devt)) % CUSE_CONNTBL_LEN]; +} + + +/************************************************************************** + * CUSE frontend operations + * + * These are file operations for the character device. + * + * On open, CUSE opens a file from the FUSE mnt and stores it to + * private_data of the open file. All other ops call FUSE ops on the + * FUSE file. + */ + +static ssize_t cuse_read(struct file *file, char __user *buf, size_t count, + loff_t *ppos) +{ + loff_t pos = 0; + + return fuse_direct_io(file, buf, count, &pos, 0); +} + +static ssize_t cuse_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + loff_t pos = 0; + /* + * No locking or generic_write_checks(), the server is + * responsible for locking and sanity checks. + */ + return fuse_direct_io(file, buf, count, &pos, 1); +} + +static int cuse_open(struct inode *inode, struct file *file) +{ + dev_t devt = inode->i_cdev->dev; + struct cuse_conn *cc = NULL, *pos; + int rc; + + /* look up and get the connection */ + spin_lock(&cuse_lock); + list_for_each_entry(pos, cuse_conntbl_head(devt), list) + if (pos->dev->devt == devt) { + fuse_conn_get(&pos->fc); + cc = pos; + break; + } + spin_unlock(&cuse_lock); + + /* dead? */ + if (!cc) + return -ENODEV; + + /* + * Generic permission check is already done against the chrdev + * file, proceed to open. + */ + rc = fuse_do_open(&cc->fc, 0, file, 0); + if (rc) + fuse_conn_put(&cc->fc); + return rc; +} + +static int cuse_release(struct inode *inode, struct file *file) +{ + struct fuse_file *ff = file->private_data; + struct fuse_conn *fc = ff->fc; + + fuse_sync_release(ff, file->f_flags); + fuse_conn_put(fc); + + return 0; +} + +static long cuse_file_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + struct fuse_file *ff = file->private_data; + struct cuse_conn *cc = fc_to_cc(ff->fc); + unsigned int flags = 0; + + if (cc->unrestricted_ioctl) + flags |= FUSE_IOCTL_UNRESTRICTED; + + return fuse_do_ioctl(file, cmd, arg, flags); +} + +static long cuse_file_compat_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + struct fuse_file *ff = file->private_data; + struct cuse_conn *cc = fc_to_cc(ff->fc); + unsigned int flags = FUSE_IOCTL_COMPAT; + + if (cc->unrestricted_ioctl) + flags |= FUSE_IOCTL_UNRESTRICTED; + + return fuse_do_ioctl(file, cmd, arg, flags); +} + +static const struct file_operations cuse_frontend_fops = { + .owner = THIS_MODULE, + .read = cuse_read, + .write = cuse_write, + .open = cuse_open, + .release = cuse_release, + .unlocked_ioctl = cuse_file_ioctl, + .compat_ioctl = cuse_file_compat_ioctl, + .poll = fuse_file_poll, +}; + + +/************************************************************************** + * CUSE channel initialization and destruction + */ + +struct cuse_devinfo { + const char *name; +}; + +/** + * cuse_parse_one - parse one key=value pair + * @pp: i/o parameter for the current position + * @end: points to one past the end of the packed string + * @keyp: out parameter for key + * @valp: out parameter for value + * + * *@pp points to packed strings - "key0=val0\0key1=val1\0" which ends + * at @end - 1. This function parses one pair and set *@keyp to the + * start of the key and *@valp to the start of the value. Note that + * the original string is modified such that the key string is + * terminated with '\0'. *@pp is updated to point to the next string. + * + * RETURNS: + * 1 on successful parse, 0 on EOF, -errno on failure. + */ +static int cuse_parse_one(char **pp, char *end, char **keyp, char **valp) +{ + char *p = *pp; + char *key, *val; + + while (p < end && *p == '\0') + p++; + if (p == end) + return 0; + + if (end[-1] != '\0') { + printk(KERN_ERR "CUSE: info not properly terminated\n"); + return -EINVAL; + } + + key = val = p; + p += strlen(p); + + if (valp) { + strsep(&val, "="); + if (!val) + val = key + strlen(key); + key = strstrip(key); + val = strstrip(val); + } else + key = strstrip(key); + + if (!strlen(key)) { + printk(KERN_ERR "CUSE: zero length info key specified\n"); + return -EINVAL; + } + + *pp = p; + *keyp = key; + if (valp) + *valp = val; + + return 1; +} + +/** + * cuse_parse_dev_info - parse device info + * @p: device info string + * @len: length of device info string + * @devinfo: out parameter for parsed device info + * + * Parse @p to extract device info and store it into @devinfo. String + * pointed to by @p is modified by parsing and @devinfo points into + * them, so @p shouldn't be freed while @devinfo is in use. + * + * RETURNS: + * 0 on success, -errno on failure. + */ +static int cuse_parse_devinfo(char *p, size_t len, struct cuse_devinfo *devinfo) +{ + char *end = p + len; + char *key, *val; + int rc; + + while (true) { + rc = cuse_parse_one(&p, end, &key, &val); + if (rc < 0) + return rc; + if (!rc) + break; + if (strcmp(key, "DEVNAME") == 0) + devinfo->name = val; + else + printk(KERN_WARNING "CUSE: unknown device info \"%s\"\n", + key); + } + + if (!devinfo->name || !strlen(devinfo->name)) { + printk(KERN_ERR "CUSE: DEVNAME unspecified\n"); + return -EINVAL; + } + + return 0; +} + +static void cuse_gendev_release(struct device *dev) +{ + kfree(dev); +} + +/** + * cuse_process_init_reply - finish initializing CUSE channel + * + * This function creates the character device and sets up all the + * required data structures for it. Please read the comment at the + * top of this file for high level overview. + */ +static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req) +{ + struct cuse_conn *cc = fc_to_cc(fc); + struct cuse_init_out *arg = &req->misc.cuse_init_out; + struct page *page = req->pages[0]; + struct cuse_devinfo devinfo = { }; + struct device *dev; + struct cdev *cdev; + dev_t devt; + int rc; + + if (req->out.h.error || + arg->major != FUSE_KERNEL_VERSION || arg->minor < 11) { + goto err; + } + + fc->minor = arg->minor; + fc->max_read = max_t(unsigned, arg->max_read, 4096); + fc->max_write = max_t(unsigned, arg->max_write, 4096); + + /* parse init reply */ + cc->unrestricted_ioctl = arg->flags & CUSE_UNRESTRICTED_IOCTL; + + rc = cuse_parse_devinfo(page_address(page), req->out.args[1].size, + &devinfo); + if (rc) + goto err; + + /* determine and reserve devt */ + devt = MKDEV(arg->dev_major, arg->dev_minor); + if (!MAJOR(devt)) + rc = alloc_chrdev_region(&devt, MINOR(devt), 1, devinfo.name); + else + rc = register_chrdev_region(devt, 1, devinfo.name); + if (rc) { + printk(KERN_ERR "CUSE: failed to register chrdev region\n"); + goto err; + } + + /* devt determined, create device */ + rc = -ENOMEM; + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) + goto err_region; + + device_initialize(dev); + dev_set_uevent_suppress(dev, 1); + dev->class = cuse_class; + dev->devt = devt; + dev->release = cuse_gendev_release; + dev_set_drvdata(dev, cc); + dev_set_name(dev, "%s", devinfo.name); + + rc = device_add(dev); + if (rc) + goto err_device; + + /* register cdev */ + rc = -ENOMEM; + cdev = cdev_alloc(); + if (!cdev) + goto err_device; + + cdev->owner = THIS_MODULE; + cdev->ops = &cuse_frontend_fops; + + rc = cdev_add(cdev, devt, 1); + if (rc) + goto err_cdev; + + cc->dev = dev; + cc->cdev = cdev; + + /* make the device available */ + spin_lock(&cuse_lock); + list_add(&cc->list, cuse_conntbl_head(devt)); + spin_unlock(&cuse_lock); + + /* announce device availability */ + dev_set_uevent_suppress(dev, 0); + kobject_uevent(&dev->kobj, KOBJ_ADD); +out: + __free_page(page); + return; + +err_cdev: + cdev_del(cdev); +err_device: + put_device(dev); +err_region: + unregister_chrdev_region(devt, 1); +err: + fc->conn_error = 1; + goto out; +} + +static int cuse_send_init(struct cuse_conn *cc) +{ + int rc; + struct fuse_req *req; + struct page *page; + struct fuse_conn *fc = &cc->fc; + struct cuse_init_in *arg; + + BUILD_BUG_ON(CUSE_INIT_INFO_MAX > PAGE_SIZE); + + req = fuse_get_req(fc); + if (IS_ERR(req)) { + rc = PTR_ERR(req); + goto err; + } + + rc = -ENOMEM; + page = alloc_page(GFP_KERNEL | __GFP_ZERO); + if (!page) + goto err_put_req; + + arg = &req->misc.cuse_init_in; + arg->major = FUSE_KERNEL_VERSION; + arg->minor = FUSE_KERNEL_MINOR_VERSION; + arg->flags |= CUSE_UNRESTRICTED_IOCTL; + req->in.h.opcode = CUSE_INIT; + req->in.numargs = 1; + req->in.args[0].size = sizeof(struct cuse_init_in); + req->in.args[0].value = arg; + req->out.numargs = 2; + req->out.args[0].size = sizeof(struct cuse_init_out); + req->out.args[0].value = &req->misc.cuse_init_out; + req->out.args[1].size = CUSE_INIT_INFO_MAX; + req->out.argvar = 1; + req->out.argpages = 1; + req->pages[0] = page; + req->num_pages = 1; + req->end = cuse_process_init_reply; + fuse_request_send_background(fc, req); + + return 0; + +err_put_req: + fuse_put_request(fc, req); +err: + return rc; +} + +static void cuse_fc_release(struct fuse_conn *fc) +{ + struct cuse_conn *cc = fc_to_cc(fc); + kfree(cc); +} + +/** + * cuse_channel_open - open method for /dev/cuse + * @inode: inode for /dev/cuse + * @file: file struct being opened + * + * Userland CUSE server can create a CUSE device by opening /dev/cuse + * and replying to the initilaization request kernel sends. This + * function is responsible for handling CUSE device initialization. + * Because the fd opened by this function is used during + * initialization, this function only creates cuse_conn and sends + * init. The rest is delegated to a kthread. + * + * RETURNS: + * 0 on success, -errno on failure. + */ +static int cuse_channel_open(struct inode *inode, struct file *file) +{ + struct cuse_conn *cc; + int rc; + + /* set up cuse_conn */ + cc = kzalloc(sizeof(*cc), GFP_KERNEL); + if (!cc) + return -ENOMEM; + + fuse_conn_init(&cc->fc); + + INIT_LIST_HEAD(&cc->list); + cc->fc.release = cuse_fc_release; + + cc->fc.connected = 1; + cc->fc.blocked = 0; + rc = cuse_send_init(cc); + if (rc) { + fuse_conn_put(&cc->fc); + return rc; + } + file->private_data = &cc->fc; /* channel owns base reference to cc */ + + return 0; +} + +/** + * cuse_channel_release - release method for /dev/cuse + * @inode: inode for /dev/cuse + * @file: file struct being closed + * + * Disconnect the channel, deregister CUSE device and initiate + * destruction by putting the default reference. + * + * RETURNS: + * 0 on success, -errno on failure. + */ +static int cuse_channel_release(struct inode *inode, struct file *file) +{ + struct cuse_conn *cc = fc_to_cc(file->private_data); + int rc; + + /* remove from the conntbl, no more access from this point on */ + spin_lock(&cuse_lock); + list_del_init(&cc->list); + spin_unlock(&cuse_lock); + + /* remove device */ + if (cc->dev) + device_unregister(cc->dev); + if (cc->cdev) { + unregister_chrdev_region(cc->cdev->dev, 1); + cdev_del(cc->cdev); + } + + /* kill connection and shutdown channel */ + fuse_conn_kill(&cc->fc); + rc = fuse_dev_release(inode, file); /* puts the base reference */ + + return rc; +} + +static struct file_operations cuse_channel_fops; /* initialized during init */ + + +/************************************************************************** + * Misc stuff and module initializatiion + * + * CUSE exports the same set of attributes to sysfs as fusectl. + */ + +static ssize_t cuse_class_waiting_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cuse_conn *cc = dev_get_drvdata(dev); + + return sprintf(buf, "%d\n", atomic_read(&cc->fc.num_waiting)); +} + +static ssize_t cuse_class_abort_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct cuse_conn *cc = dev_get_drvdata(dev); + + fuse_abort_conn(&cc->fc); + return count; +} + +static struct device_attribute cuse_class_dev_attrs[] = { + __ATTR(waiting, S_IFREG | 0400, cuse_class_waiting_show, NULL), + __ATTR(abort, S_IFREG | 0200, NULL, cuse_class_abort_store), + { } +}; + +static struct miscdevice cuse_miscdev = { + .minor = MISC_DYNAMIC_MINOR, + .name = "cuse", + .fops = &cuse_channel_fops, +}; + +static int __init cuse_init(void) +{ + int i, rc; + + /* init conntbl */ + for (i = 0; i < CUSE_CONNTBL_LEN; i++) + INIT_LIST_HEAD(&cuse_conntbl[i]); + + /* inherit and extend fuse_dev_operations */ + cuse_channel_fops = fuse_dev_operations; + cuse_channel_fops.owner = THIS_MODULE; + cuse_channel_fops.open = cuse_channel_open; + cuse_channel_fops.release = cuse_channel_release; + + cuse_class = class_create(THIS_MODULE, "cuse"); + if (IS_ERR(cuse_class)) + return PTR_ERR(cuse_class); + + cuse_class->dev_attrs = cuse_class_dev_attrs; + + rc = misc_register(&cuse_miscdev); + if (rc) { + class_destroy(cuse_class); + return rc; + } + + return 0; +} + +static void __exit cuse_exit(void) +{ + misc_deregister(&cuse_miscdev); + class_destroy(cuse_class); +} + +module_init(cuse_init); +module_exit(cuse_exit); + +MODULE_AUTHOR("Tejun Heo "); +MODULE_DESCRIPTION("Character device in Userspace"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3