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rpmsgfs: cache statfs result in case of deadlock

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rptun: msg from other cpu
[ap] [ 5] [<0x2c353768>] arm_switchcontext+0xc/0x10
[ap] [ 5] [<0x2c322266>] sem_wait+0x5a/0xbc
[ap] [ 5] [<0x2c7400a8>] inode_semtake+0x24/0x5c
[ap] [ 5] [<0x2c74087a>] inode_release+0x6/0x60
[ap] [ 5] [<0x2c741284>] file_close+0x18/0x44
[ap] [ 5] [<0x2c74fb06>] rpmsgfs_close_handler+0x86/0xe4
[ap] [ 5] [<0x2c75b8de>] rpmsg_virtio_rx_callback+0xba/0x1b4
[ap] [ 5] [<0x2c75af70>] rproc_virtio_notified+0x44/0x5c
[ap] [ 5] [<0x2c75a93c>] remoteproc_get_notification+0x1c/0x2c
[ap] [ 5] [<0x2c335a08>] rptun_thread+0x74/0x208
[ap] [ 5] [<0x2c323e72>] nxtask_start+0x3a/0x60

nsh: send msg to other cpu with inode lock
[ap] [10] [<0x2c353768>] arm_switchcontext+0xc/0x10
[ap] [10] [<0x2c3221b2>] nxsem_wait_uninterruptible+0x6e/0xc8
[ap] [10] [<0x2c74e498>] rpmsgfs_send_recv.constprop.0+0x78/0xc0
[ap] [10] [<0x2c74ebc0>] rpmsgfs_client_statfs+0x50/0x80
[ap] [10] [<0x2c3221ca>] nxsem_wait_uninterruptible+0x86/0xc8
[ap] [10] [<0x2c74da78>] rpmsgfs_statfs+0x28/0x50
[ap] [10] [<0x2c74534e>] mountpoint_filter+0x66/0x90
[ap] [10] [<0x2c740016>] foreach_inodelevel+0x66/0x88
[ap] [10] [<0x2c73fffa>] foreach_inodelevel+0x4a/0x88
[ap] [10] [<0x2c740062>] foreach_inode+0x2a/0x48
[ap] [10] [<0x2c745388>] foreach_mountpoint+0x10/0x20
[ap] [10] [<0x2c745606>] mount_read+0x36/0x70
[ap] [10] [<0x2c742a34>] read+0x30/0x5c
[ap] [10] [<0x2c371096>] nsh_catfile+0x36/0x140
[ap] [10] [<0x2c36d01a>] nsh_parse_command+0x7fe/0xc54
[ap] [10] [<0x2c370f92>] nsh_session+0x66/0x134
[ap] [10] [<0x2c3721a4>] nsh_consolemain+0x2c/0x44
[ap] [10] [<0x2c374fde>] nsh_main+0x2a/0x4c
[ap] [10] [<0x2c33f7f8>] lib_cxx_initialize+0x24/0x48
[ap] [10] [<0x2c34274a>] nxtask_startup+0x12/0x24
[ap] [10] [<0x2c323e7e>] nxtask_start+0x46/0x60

Signed-off-by: ligd <liguiding1@xiaomi.com>
This commit is contained in:
ligd
2022-07-07 14:43:59 +08:00
committed by Petro Karashchenko
parent 5f60b7dc12
commit 572d865034
1 changed files with 10 additions and 0 deletions
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fs/rpmsgfs/rpmsgfs.c
+10
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@@ -78,6 +78,7 @@ struct rpmsgfs_mountpt_s
char fs_root[PATH_MAX]; char fs_root[PATH_MAX];
void *handle; void *handle;
int timeout; /* Connect timeout */ int timeout; /* Connect timeout */
struct statfs statfs;
}; };
/**************************************************************************** /****************************************************************************
@@ -1232,12 +1233,21 @@ static int rpmsgfs_statfs(FAR struct inode *mountpt, FAR struct statfs *buf)
return ret; return ret;
} }
if (fs->statfs.f_type == RPMSGFS_MAGIC)
{
memcpy(buf, &fs->statfs, sizeof(struct statfs));
rpmsgfs_semgive(fs);
return 0;
}
/* Call the host fs to perform the statfs */ /* Call the host fs to perform the statfs */
memset(buf, 0, sizeof(struct statfs)); memset(buf, 0, sizeof(struct statfs));
ret = rpmsgfs_client_statfs(fs->handle, fs->fs_root, buf); ret = rpmsgfs_client_statfs(fs->handle, fs->fs_root, buf);
buf->f_type = RPMSGFS_MAGIC; buf->f_type = RPMSGFS_MAGIC;
memcpy(&fs->statfs, buf, sizeof(struct statfs));
rpmsgfs_semgive(fs); rpmsgfs_semgive(fs);
return ret; return ret;
} }