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introduce FMODE_CREATED and switch to it

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Parallel to FILE_CREATED, goes into ->f_mode instead of *opened.
NFS is a bit of a wart here - it doesn't have file at the point
where FILE_CREATED used to be set, so we need to propagate it
there (for now).  IMA is another one (here and everywhere)...

Note that this needs do_dentry_open() to leave old bits in ->f_mode
alone - we want it to preserve FMODE_CREATED if it had been already
set (no other bit can be there).

Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2018-06-08 13:22:02 -04:00
parent aad888f828
commit 73a09dd943
10 changed files with 20 additions and 15 deletions
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15
fs/namei.c
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@@ -3061,7 +3061,7 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
* permission here.
*/
int acc_mode = op->acc_mode;
if (*opened & FILE_CREATED) {
if (file->f_mode & FMODE_CREATED) {
WARN_ON(!(open_flag & O_CREAT));
fsnotify_create(dir, dentry);
acc_mode = 0;
@@ -3077,7 +3077,7 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
dput(dentry);
dentry = file->f_path.dentry;
}
if (*opened & FILE_CREATED)
if (file->f_mode & FMODE_CREATED)
fsnotify_create(dir, dentry);
if (unlikely(d_is_negative(dentry))) {
error = -ENOENT;
@@ -3126,7 +3126,7 @@ static int lookup_open(struct nameidata *nd, struct path *path,
if (unlikely(IS_DEADDIR(dir_inode)))
return -ENOENT;
*opened &= ~FILE_CREATED;
file->f_mode &= ~FMODE_CREATED;
dentry = d_lookup(dir, &nd->last);
for (;;) {
if (!dentry) {
@@ -3211,7 +3211,7 @@ static int lookup_open(struct nameidata *nd, struct path *path,
/* Negative dentry, just create the file */
if (!dentry->d_inode && (open_flag & O_CREAT)) {
*opened |= FILE_CREATED;
file->f_mode |= FMODE_CREATED;
audit_inode_child(dir_inode, dentry, AUDIT_TYPE_CHILD_CREATE);
if (!dir_inode->i_op->create) {
error = -EACCES;
@@ -3318,7 +3318,7 @@ static int do_last(struct nameidata *nd,
if (error)
goto out;
if ((*opened & FILE_CREATED) ||
if ((file->f_mode & FMODE_CREATED) ||
!S_ISREG(file_inode(file)->i_mode))
will_truncate = false;
@@ -3326,7 +3326,7 @@ static int do_last(struct nameidata *nd,
goto opened;
}
if (*opened & FILE_CREATED) {
if (file->f_mode & FMODE_CREATED) {
/* Don't check for write permission, don't truncate */
open_flag &= ~O_TRUNC;
will_truncate = false;
@@ -3400,7 +3400,8 @@ static int do_last(struct nameidata *nd,
if (error)
goto out;
opened:
error = ima_file_check(file, op->acc_mode, *opened);
error = ima_file_check(file, op->acc_mode,
file->f_mode & FMODE_CREATED ? FILE_CREATED : 0);
if (!error && will_truncate)
error = handle_truncate(file);
out: