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authorAmir Goldstein <amir73il@gmail.com>2019-06-05 08:04:49 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2019-06-09 10:06:19 -0700
commite38f7f53c35213b1cbce70eee5de7ced17f40d4a (patch)
tree16dc10d9c6ad567b4626798612688c586e86e71d /fs/inode.c
parent96e6e8f4a68df2d94800311163faa67124df24e5 (diff)
downloadlinux-e38f7f53c35213b1cbce70eee5de7ced17f40d4a.tar.bz2
vfs: introduce file_modified() helper
The combination of file_remove_privs() and file_update_mtime() is quite common in filesystem ->write_iter() methods. Modelled after the helper file_accessed(), introduce file_modified() and use it from generic_remap_file_range_prep(). Note that the order of calling file_remove_privs() before file_update_mtime() in the helper was matched to the more common order by filesystems and not the current order in generic_remap_file_range_prep(). Signed-off-by: Amir Goldstein <amir73il@gmail.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/inode.c')
-rw-r--r--fs/inode.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/inode.c b/fs/inode.c
index df6542ec3b88..4348cfb14562 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1899,6 +1899,26 @@ int file_update_time(struct file *file)
}
EXPORT_SYMBOL(file_update_time);
+/* Caller must hold the file's inode lock */
+int file_modified(struct file *file)
+{
+ int err;
+
+ /*
+ * Clear the security bits if the process is not being run by root.
+ * This keeps people from modifying setuid and setgid binaries.
+ */
+ err = file_remove_privs(file);
+ if (err)
+ return err;
+
+ if (unlikely(file->f_mode & FMODE_NOCMTIME))
+ return 0;
+
+ return file_update_time(file);
+}
+EXPORT_SYMBOL(file_modified);
+
int inode_needs_sync(struct inode *inode)
{
if (IS_SYNC(inode))