1 files changed, 86 insertions, 25 deletions

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index c4b98c03a46e..0fcdba9d47c0 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -28,7 +28,9 @@ static int fuse_send_open(struct inode *inode, struct file *file, int isdir,
                 return PTR_ERR(req);
 
         memset(&inarg, 0, sizeof(inarg));
-        inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
+        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.numargs = 1;
@@ -54,6 +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;
@@ -148,12 +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
@@ -180,7 +189,7 @@ static int fuse_release(struct inode *inode, struct file *file)
  * Scramble the ID space with XTEA, so that the value of the files_struct
  * pointer is not exposed to userspace.
  */
-static u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id)
+u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id)
 {
         u32 *k = fc->scramble_key;
         u64 v = (unsigned long) id;
@@ -299,11 +308,19 @@ void fuse_read_fill(struct fuse_req *req, struct fuse_file *ff,
 }
 
 static size_t fuse_send_read(struct fuse_req *req, struct file *file,
-                             struct inode *inode, loff_t pos, size_t count)
+                             struct inode *inode, 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;
+
         fuse_read_fill(req, ff, inode, pos, count, FUSE_READ);
+        if (owner != NULL) {
+                struct fuse_read_in *inarg = &req->misc.read_in;
+
+                inarg->read_flags |= FUSE_READ_LOCKOWNER;
+                inarg->lock_owner = fuse_lock_owner_id(fc, owner);
+        }
         request_send(fc, req);
         return req->out.args[0].size;
 }
@@ -327,7 +344,8 @@ static int fuse_readpage(struct file *file, struct page *page)
         req->out.page_zeroing = 1;
         req->num_pages = 1;
         req->pages[0] = page;
-        fuse_send_read(req, file, inode, page_offset(page), PAGE_CACHE_SIZE);
+        fuse_send_read(req, file, inode, page_offset(page), PAGE_CACHE_SIZE,
+                       NULL);
         err = req->out.h.error;
         fuse_put_request(fc, req);
         if (!err)
@@ -434,30 +452,47 @@ out:
         return err;
 }
 
-static size_t fuse_send_write(struct fuse_req *req, struct file *file,
-                              struct inode *inode, loff_t pos, size_t count)
+static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff,
+                            struct inode *inode, loff_t pos, size_t count,
+                            int writepage)
 {
         struct fuse_conn *fc = get_fuse_conn(inode);
-        struct fuse_file *ff = file->private_data;
-        struct fuse_write_in inarg;
-        struct fuse_write_out outarg;
+        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;
+        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;
         req->in.h.opcode = FUSE_WRITE;
         req->in.h.nodeid = get_node_id(inode);
         req->in.argpages = 1;
         req->in.numargs = 2;
-        req->in.args[0].size = sizeof(struct fuse_write_in);
-        req->in.args[0].value = &inarg;
+        if (fc->minor < 9)
+                req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE;
+        else
+                req->in.args[0].size = sizeof(struct fuse_write_in);
+        req->in.args[0].value = inarg;
         req->in.args[1].size = count;
         req->out.numargs = 1;
         req->out.args[0].size = sizeof(struct fuse_write_out);
-        req->out.args[0].value = &outarg;
+        req->out.args[0].value = outarg;
+}
+
+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)
+{
+        struct fuse_conn *fc = get_fuse_conn(inode);
+        fuse_write_fill(req, file->private_data, inode, pos, count, 0);
+        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);
+        }
         request_send(fc, req);
-        return outarg.size;
+        return req->misc.write.out.size;
 }
 
 static int fuse_write_begin(struct file *file, struct address_space *mapping,
@@ -478,6 +513,7 @@ static int fuse_buffered_write(struct file *file, struct inode *inode,
         int err;
         size_t nres;
         struct fuse_conn *fc = get_fuse_conn(inode);
+        struct fuse_inode *fi = get_fuse_inode(inode);
         unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
         struct fuse_req *req;
 
@@ -491,7 +527,7 @@ 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);
+        nres = fuse_send_write(req, file, inode, pos, count, NULL);
         err = req->out.h.error;
         fuse_put_request(fc, req);
         if (!err && !nres)
@@ -499,6 +535,7 @@ static int fuse_buffered_write(struct file *file, struct inode *inode,
         if (!err) {
                 pos += nres;
                 spin_lock(&fc->lock);
+                fi->attr_version = ++fc->attr_version;
                 if (pos > inode->i_size)
                         i_size_write(inode, pos);
                 spin_unlock(&fc->lock);
@@ -591,9 +628,11 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf,
                 nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset;
                 nbytes = min(count, nbytes);
                 if (write)
-                        nres = fuse_send_write(req, file, inode, pos, nbytes);
+                        nres = fuse_send_write(req, file, inode, pos, nbytes,
+                                               current->files);
                 else
-                        nres = fuse_send_read(req, file, inode, pos, nbytes);
+                        nres = fuse_send_read(req, file, inode, pos, nbytes,
+                                              current->files);
                 fuse_release_user_pages(req, !write);
                 if (req->out.h.error) {
                         if (!res)
@@ -695,7 +734,8 @@ static int convert_fuse_file_lock(const struct fuse_file_lock *ffl,
 }
 
 static void fuse_lk_fill(struct fuse_req *req, struct file *file,
-                         const struct file_lock *fl, int opcode, pid_t pid)
+                         const struct file_lock *fl, int opcode, pid_t pid,
+                         int flock)
 {
         struct inode *inode = file->f_path.dentry->d_inode;
         struct fuse_conn *fc = get_fuse_conn(inode);
@@ -708,6 +748,8 @@ static void fuse_lk_fill(struct fuse_req *req, struct file *file,
         arg->lk.end = fl->fl_end;
         arg->lk.type = fl->fl_type;
         arg->lk.pid = pid;
+        if (flock)
+                arg->lk_flags |= FUSE_LK_FLOCK;
         req->in.h.opcode = opcode;
         req->in.h.nodeid = get_node_id(inode);
         req->in.numargs = 1;
@@ -727,7 +769,7 @@ static int fuse_getlk(struct file *file, struct file_lock *fl)
         if (IS_ERR(req))
                 return PTR_ERR(req);
 
-        fuse_lk_fill(req, file, fl, FUSE_GETLK, 0);
+        fuse_lk_fill(req, file, fl, FUSE_GETLK, 0, 0);
         req->out.numargs = 1;
         req->out.args[0].size = sizeof(outarg);
         req->out.args[0].value = &outarg;
@@ -740,7 +782,7 @@ static int fuse_getlk(struct file *file, struct file_lock *fl)
         return err;
 }
 
-static int fuse_setlk(struct file *file, struct file_lock *fl)
+static int fuse_setlk(struct file *file, struct file_lock *fl, int flock)
 {
         struct inode *inode = file->f_path.dentry->d_inode;
         struct fuse_conn *fc = get_fuse_conn(inode);
@@ -757,7 +799,7 @@ static int fuse_setlk(struct file *file, struct file_lock *fl)
         if (IS_ERR(req))
                 return PTR_ERR(req);
 
-        fuse_lk_fill(req, file, fl, opcode, pid);
+        fuse_lk_fill(req, file, fl, opcode, pid, flock);
         request_send(fc, req);
         err = req->out.h.error;
         /* locking is restartable */
@@ -783,8 +825,25 @@ static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl)
                 if (fc->no_lock)
                         err = posix_lock_file_wait(file, fl);
                 else
-                        err = fuse_setlk(file, fl);
+                        err = fuse_setlk(file, fl, 0);
+        }
+        return err;
+}
+
+static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl)
+{
+        struct inode *inode = file->f_path.dentry->d_inode;
+        struct fuse_conn *fc = get_fuse_conn(inode);
+        int err;
+
+        if (fc->no_lock) {
+                err = flock_lock_file_wait(file, fl);
+        } else {
+                /* emulate flock with POSIX locks */
+                fl->fl_owner = (fl_owner_t) file;
+                err = fuse_setlk(file, fl, 1);
         }
+
         return err;
 }
 
@@ -836,6 +895,7 @@ static const struct file_operations fuse_file_operations = {
         .release        = fuse_release,
         .fsync          = fuse_fsync,
         .lock           = fuse_file_lock,
+        .flock          = fuse_file_flock,
         .splice_read    = generic_file_splice_read,
 };
 
@@ -848,6 +908,7 @@ static const struct file_operations fuse_direct_io_file_operations = {
         .release        = fuse_release,
         .fsync          = fuse_fsync,
         .lock           = fuse_file_lock,
+        .flock          = fuse_file_flock,
         /* no mmap and splice_read */
 };