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vfs: ftruncate check IS_APPEND() on real upper inode 

ftruncate an overlayfs inode was checking IS_APPEND() on
overlay inode, but overlay inode does not have the S_APPEND flag.

Check IS_APPEND() on real upper inode instead.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein 2017-04-08 14:49:06 +03:00 committed by Miklos Szeredi
parent 33006cdf9c
commit 78757af651
1 changed files with 2 additions and 1 deletions
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3
fs/open.c
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@ -193,7 +193,8 @@ static long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
goto out_putf;
error = -EPERM;
if (IS_APPEND(inode))
/* Check IS_APPEND on real upper inode */
if (IS_APPEND(file_inode(f.file)))
goto out_putf;
sb_start_write(inode->i_sb);