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authorJianyong Wu <jianyong.wu@arm.com>2020-07-10 13:15:48 +0300
committerDominique Martinet <asmadeus@codewreck.org>2020-07-19 15:58:47 +0300
commit66246641609b3cbfc87e805ded1f018b5c9cecf4 (patch)
treeb1f32cee7183ecd7adb40fa09eb3cf1526b4aafe /fs/9p/vfs_inode_dotl.c
parent74d6a5d5662975aed7f25952f62efbb6f6dadd29 (diff)
downloadlinux-66246641609b3cbfc87e805ded1f018b5c9cecf4.tar.xz
9p: retrieve fid from file when file instance exist.
In the current setattr implementation in 9p, fid is always retrieved from dentry no matter file instance exists or not. If so, there may be some info related to opened file instance dropped. So it's better to retrieve fid from file instance when it is passed to setattr. for example: fd=open("tmp", O_RDWR); ftruncate(fd, 10); The file context related with the fd will be lost as fid is always retrieved from dentry, then the backend can't get the info of file context. It is against the original intention of user and may lead to bug. Link: http://lkml.kernel.org/r/20200710101548.10108-1-jianyong.wu@arm.com Signed-off-by: Jianyong Wu <jianyong.wu@arm.com> Signed-off-by: Dominique Martinet <asmadeus@codewreck.org>
Diffstat (limited to 'fs/9p/vfs_inode_dotl.c')
-rw-r--r--fs/9p/vfs_inode_dotl.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index 60328b21c5fb..0028eccb665a 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -540,7 +540,7 @@ static int v9fs_mapped_iattr_valid(int iattr_valid)
int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
{
int retval;
- struct p9_fid *fid;
+ struct p9_fid *fid = NULL;
struct p9_iattr_dotl p9attr;
struct inode *inode = d_inode(dentry);
@@ -560,7 +560,12 @@ int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
- fid = v9fs_fid_lookup(dentry);
+ if (iattr->ia_valid & ATTR_FILE) {
+ fid = iattr->ia_file->private_data;
+ WARN_ON(!fid);
+ }
+ if (!fid)
+ fid = v9fs_fid_lookup(dentry);
if (IS_ERR(fid))
return PTR_ERR(fid);