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vfs: make unlink() and rmdir() return ENOENT in preference to EROFS 

If user space attempts to remove a non-existent file or directory, and
the file system is mounted read-only, return ENOENT instead of EROFS.
Either error code is arguably valid/correct, but ENOENT is a more
specific error message.

Reported-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Theodore Ts'o 2011-06-06 19:19:40 -04:00 committed by Al Viro
parent 9054760ff5
commit e6bc45d65d
1 changed files with 7 additions and 4 deletions
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11
fs/namei.c
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@ -2624,6 +2624,10 @@ static long do_rmdir(int dfd, const char __user *pathname)
error = PTR_ERR(dentry);
if (IS_ERR(dentry))
goto exit2;
if (!dentry->d_inode) {
error = -ENOENT;
goto exit3;
}
error = mnt_want_write(nd.path.mnt);
if (error)
goto exit3;
@ -2709,11 +2713,10 @@ static long do_unlinkat(int dfd, const char __user *pathname)
error = PTR_ERR(dentry);
if (!IS_ERR(dentry)) {
/* Why not before? Because we want correct error value */
if (nd.last.name[nd.last.len])
goto slashes;
inode = dentry->d_inode;
if (inode)
ihold(inode);
if (nd.last.name[nd.last.len] || !inode)
goto slashes;
ihold(inode);
error = mnt_want_write(nd.path.mnt);
if (error)
goto exit2;