Adds a new capability flag FUSE_ABORT_ERROR. If set and the connection
is gone because of sysfs abort, reading from the device will return
-ECONNABORTED.
Signed-off-by: Szymon Lukasz <noh4hss-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
fs/fuse/control.c | 2 +-
fs/fuse/cuse.c | 4 ++--
fs/fuse/dev.c | 12 +++++++-----
fs/fuse/fuse_i.h | 8 +++++++-
fs/fuse/inode.c | 9 ++++++---
include/uapi/linux/fuse.h | 7 ++++++-
6 files changed, 29 insertions(+), 13 deletions(-)
diff --git a/fs/fuse/control.c b/fs/fuse/control.c
index b9ea99c5b5b3..78fb7a07c5ca 100644
--- a/fs/fuse/control.c
+++ b/fs/fuse/control.c
@@ -35,7 +35,7 @@ static ssize_t fuse_conn_abort_write(struct file *file, const char __user *buf,
{
struct fuse_conn *fc = fuse_ctl_file_conn_get(file);
if (fc) {
- fuse_abort_conn(fc);
+ fuse_abort_conn(fc, true);
fuse_conn_put(fc);
}
return count;
diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c
index e9e97803442a..31d33b69957f 100644
--- a/fs/fuse/cuse.c
+++ b/fs/fuse/cuse.c
@@ -406,7 +406,7 @@ static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
err_region:
unregister_chrdev_region(devt, 1);
err:
- fuse_abort_conn(fc);
+ fuse_abort_conn(fc, false);
goto out;
}
@@ -581,7 +581,7 @@ static ssize_t cuse_class_abort_store(struct device *dev,
{
struct cuse_conn *cc = dev_get_drvdata(dev);
- fuse_abort_conn(&cc->fc);
+ fuse_abort_conn(&cc->fc, false);
return count;
}
static DEVICE_ATTR(abort, 0200, NULL, cuse_class_abort_store);
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 13c65dd2d37d..2e1beda0b82b 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1234,9 +1234,10 @@ static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file,
if (err)
goto err_unlock;
- err = -ENODEV;
- if (!fiq->connected)
+ if (!fiq->connected) {
+ err = (fc->aborted && fc->abort_err) ? -ECONNABORTED : -ENODEV;
goto err_unlock;
+ }
if (!list_empty(&fiq->interrupts)) {
req = list_entry(fiq->interrupts.next, struct fuse_req,
@@ -1287,7 +1288,7 @@ static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file,
spin_lock(&fpq->lock);
clear_bit(FR_LOCKED, &req->flags);
if (!fpq->connected) {
- err = -ENODEV;
+ err = (fc->aborted && fc->abort_err) ? -ECONNABORTED : -ENODEV;
goto out_end;
}
if (err) {
@@ -2076,7 +2077,7 @@ static void end_polls(struct fuse_conn *fc)
* is OK, the request will in that case be removed from the list before we touch
* it.
*/
-void fuse_abort_conn(struct fuse_conn *fc)
+void fuse_abort_conn(struct fuse_conn *fc, bool is_abort)
{
struct fuse_iqueue *fiq = &fc->iq;
@@ -2089,6 +2090,7 @@ void fuse_abort_conn(struct fuse_conn *fc)
fc->connected = 0;
fc->blocked = 0;
+ fc->aborted = is_abort;
fuse_set_initialized(fc);
list_for_each_entry(fud, &fc->devices, entry) {
struct fuse_pqueue *fpq = &fud->pq;
@@ -2151,7 +2153,7 @@ int fuse_dev_release(struct inode *inode, struct file *file)
/* Are we the last open device? */
if (atomic_dec_and_test(&fc->dev_count)) {
WARN_ON(fc->iq.fasync != NULL);
- fuse_abort_conn(fc);
+ fuse_abort_conn(fc, false);
}
fuse_dev_free(fud);
}
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index d5773ca67ad2..2f8a261d8669 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -515,6 +515,9 @@ struct fuse_conn {
abort and device release */
unsigned connected;
+ /** Connection aborted via sysfs */
+ bool aborted;
+
/** Connection failed (version mismatch). Cannot race with
setting other bitfields since it is only set once in INIT
reply, before any other request, and never cleared */
@@ -526,6 +529,9 @@ struct fuse_conn {
/** Do readpages asynchronously? Only set in INIT */
unsigned async_read:1;
+ /** Return an unique read error after abort. Only set in INIT */
+ unsigned abort_err:1;
+
/** Do not send separate SETATTR request before open(O_TRUNC) */
unsigned atomic_o_trunc:1;
@@ -851,7 +857,7 @@ void fuse_request_send_background_locked(struct fuse_conn *fc,
struct fuse_req *req);
/* Abort all requests */
-void fuse_abort_conn(struct fuse_conn *fc);
+void fuse_abort_conn(struct fuse_conn *fc, bool is_abort);
/**
* Invalidate inode attributes
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 94a745acaef8..46a17de24e14 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -371,7 +371,7 @@ void fuse_unlock_inode(struct inode *inode)
static void fuse_umount_begin(struct super_block *sb)
{
- fuse_abort_conn(get_fuse_conn_super(sb));
+ fuse_abort_conn(get_fuse_conn_super(sb), false);
}
static void fuse_send_destroy(struct fuse_conn *fc)
@@ -393,7 +393,7 @@ static void fuse_put_super(struct super_block *sb)
fuse_send_destroy(fc);
- fuse_abort_conn(fc);
+ fuse_abort_conn(fc, false);
mutex_lock(&fuse_mutex);
list_del(&fc->entry);
fuse_ctl_remove_conn(fc);
@@ -918,6 +918,8 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
fc->posix_acl = 1;
fc->sb->s_xattr = fuse_acl_xattr_handlers;
}
+ if (arg->flags & FUSE_ABORT_ERROR)
+ fc->abort_err = 1;
} else {
ra_pages = fc->max_read / PAGE_SIZE;
fc->no_lock = 1;
@@ -948,7 +950,8 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
FUSE_DO_READDIRPLUS | FUSE_READDIRPLUS_AUTO | FUSE_ASYNC_DIO |
FUSE_WRITEBACK_CACHE | FUSE_NO_OPEN_SUPPORT |
- FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL;
+ FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL |
+ FUSE_ABORT_ERROR;
req->in.h.opcode = FUSE_INIT;
req->in.numargs = 1;
req->in.args[0].size = sizeof(*arg);
diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index 42fa977e3b14..f9b11c43c8f6 100644
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -112,6 +112,9 @@
* 7.26
* - add FUSE_HANDLE_KILLPRIV
* - add FUSE_POSIX_ACL
+ *
+ * 7.27
+ * - add FUSE_ABORT_ERROR
*/
#ifndef _LINUX_FUSE_H
@@ -147,7 +150,7 @@
#define FUSE_KERNEL_VERSION 7
/** Minor version number of this interface */
-#define FUSE_KERNEL_MINOR_VERSION 26
+#define FUSE_KERNEL_MINOR_VERSION 27
/** The node ID of the root inode */
#define FUSE_ROOT_ID 1
@@ -244,6 +247,7 @@ struct fuse_file_lock {
* FUSE_PARALLEL_DIROPS: allow parallel lookups and readdir
* FUSE_HANDLE_KILLPRIV: fs handles killing suid/sgid/cap on write/chown/trunc
* FUSE_POSIX_ACL: filesystem supports posix acls
+ * FUSE_ABORT_ERROR: reading the device after abort returns ECONNABORTED
*/
#define FUSE_ASYNC_READ (1 << 0)
#define FUSE_POSIX_LOCKS (1 << 1)
@@ -266,6 +270,7 @@ struct fuse_file_lock {
#define FUSE_PARALLEL_DIROPS (1 << 18)
#define FUSE_HANDLE_KILLPRIV (1 << 19)
#define FUSE_POSIX_ACL (1 << 20)
+#define FUSE_ABORT_ERROR (1 << 21)
/**
* CUSE INIT request/reply flags
--
2.15.0