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fuse: add a dev ioctl for recovery 

For a simple read-only file system, as long as the connection
 is not broken, the recovery of the user-mode read-only file
 system process can be realized by putting the request of the
 processing list back into the pending list.

Signed-off-by: Peng Hao <flyingpeng@tencent.com>
This commit is contained in:
Peng Hao 2021-10-12 09:22:27 +08:00 committed by kaixuxiakx
parent 06d37efeef
commit e1c207b3e7
2 changed files with 25 additions and 0 deletions
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24
fs/fuse/dev.c
View File

@ -2255,6 +2255,30 @@ static long fuse_dev_ioctl(struct file *file, unsigned int cmd,
}
}
}
if (cmd == FUSE_DEV_IOC_RECOVERY) {
struct fuse_dev *fud = fuse_get_dev(file);
struct fuse_iqueue *fiq = &fud->fc->iq;
struct fuse_pqueue *fpq = &fud->pq;
struct fuse_req *req, *next;
LIST_HEAD(recovery);
unsigned int i;
spin_lock(&fpq->lock);
for (i = 0; i < FUSE_PQ_HASH_SIZE; i++)
list_splice_tail_init(&fpq->processing[i],
&recovery);
spin_unlock(&fpq->lock);
list_for_each_entry_safe(req, next, &recovery, list) {
clear_bit(FR_SENT, &req->flags);
set_bit(FR_PENDING, &req->flags);
}
spin_lock(&fiq->lock);
list_splice(&recovery, &fiq->pending);
spin_unlock(&fiq->lock);
err = 0;
}
return err;
}

1
include/uapi/linux/fuse.h
View File

@ -870,6 +870,7 @@ struct fuse_notify_retrieve_in {
/* Device ioctls: */
#define FUSE_DEV_IOC_CLONE _IOR(229, 0, uint32_t)
#define FUSE_DEV_IOC_RECOVERY _IOR(230, 0, uint32_t)
struct fuse_lseek_in {
uint64_t fh;