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platform_kernel-5.15
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lookup_open(): saner calling conventions (return dentry on success) 

same story as for atomic_open() in the previous commit.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-01-09 14:25:14 -05:00
parent 239eb98338
commit da5ebf5aa6
1 changed files with 19 additions and 27 deletions
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46
fs/namei.c
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@ -3157,10 +3157,9 @@ static struct dentry *atomic_open(struct nameidata *nd, struct dentry *dentry,
* *
* An error code is returned on failure. * An error code is returned on failure.
*/ */
static int lookup_open(struct nameidata *nd, struct path *path, static struct dentry *lookup_open(struct nameidata *nd, struct file *file,
struct file *file, const struct open_flags *op,
const struct open_flags *op, bool got_write)
bool got_write)
{ {
struct dentry *dir = nd->path.dentry; struct dentry *dir = nd->path.dentry;
struct inode *dir_inode = dir->d_inode; struct inode *dir_inode = dir->d_inode;
@ -3171,7 +3170,7 @@ static int lookup_open(struct nameidata *nd, struct path *path,
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
if (unlikely(IS_DEADDIR(dir_inode))) if (unlikely(IS_DEADDIR(dir_inode)))
return -ENOENT; return ERR_PTR(-ENOENT);
file->f_mode &= ~FMODE_CREATED; file->f_mode &= ~FMODE_CREATED;
dentry = d_lookup(dir, &nd->last); dentry = d_lookup(dir, &nd->last);
@ -3179,7 +3178,7 @@ static int lookup_open(struct nameidata *nd, struct path *path,
if (!dentry) { if (!dentry) {
dentry = d_alloc_parallel(dir, &nd->last, &wq); dentry = d_alloc_parallel(dir, &nd->last, &wq);
if (IS_ERR(dentry)) if (IS_ERR(dentry))
return PTR_ERR(dentry); return dentry;
} }
if (d_in_lookup(dentry)) if (d_in_lookup(dentry))
break; break;
@ -3195,7 +3194,7 @@ static int lookup_open(struct nameidata *nd, struct path *path,
} }
if (dentry->d_inode) { if (dentry->d_inode) {
/* Cached positive dentry: will open in f_op->open */ /* Cached positive dentry: will open in f_op->open */
goto out_no_open; return dentry;
} }
/* /*
@ -3235,19 +3234,9 @@ static int lookup_open(struct nameidata *nd, struct path *path,
if (dir_inode->i_op->atomic_open) { if (dir_inode->i_op->atomic_open) {
dentry = atomic_open(nd, dentry, file, op, open_flag, mode); dentry = atomic_open(nd, dentry, file, op, open_flag, mode);
if (IS_ERR(dentry)) { if (unlikely(create_error) && dentry == ERR_PTR(-ENOENT))
error = PTR_ERR(dentry); dentry = ERR_PTR(create_error);
if (unlikely(error == -ENOENT) && create_error) return dentry;
error = create_error;
return error;
}
if (file->f_mode & FMODE_OPENED) {
dput(dentry);
return 0;
}
path->mnt = nd->path.mnt;
path->dentry = dentry;
return 0;
} }
no_open: no_open:
@ -3283,14 +3272,11 @@ static int lookup_open(struct nameidata *nd, struct path *path,
error = create_error; error = create_error;
goto out_dput; goto out_dput;
} }
out_no_open: return dentry;
path->dentry = dentry;
path->mnt = nd->path.mnt;
return 0;
out_dput: out_dput:
dput(dentry); dput(dentry);
return error; return ERR_PTR(error);
} }
/* /*
@ -3309,6 +3295,7 @@ static int do_last(struct nameidata *nd,
unsigned seq; unsigned seq;
struct inode *inode; struct inode *inode;
struct path path; struct path path;
struct dentry *dentry;
int error; int error;
nd->flags &= ~LOOKUP_PARENT; nd->flags &= ~LOOKUP_PARENT;
@ -3365,14 +3352,18 @@ static int do_last(struct nameidata *nd,
inode_lock(dir->d_inode); inode_lock(dir->d_inode);
else else
inode_lock_shared(dir->d_inode); inode_lock_shared(dir->d_inode);
error = lookup_open(nd, &path, file, op, got_write); dentry = lookup_open(nd, file, op, got_write);
if (open_flag & O_CREAT) if (open_flag & O_CREAT)
inode_unlock(dir->d_inode); inode_unlock(dir->d_inode);
else else
inode_unlock_shared(dir->d_inode); inode_unlock_shared(dir->d_inode);
if (error) if (IS_ERR(dentry)) {
error = PTR_ERR(dentry);
goto out; goto out;
}
path.mnt = nd->path.mnt;
path.dentry = dentry;
if (file->f_mode & FMODE_OPENED) { if (file->f_mode & FMODE_OPENED) {
if ((file->f_mode & FMODE_CREATED) || if ((file->f_mode & FMODE_CREATED) ||
@ -3380,6 +3371,7 @@ static int do_last(struct nameidata *nd,
will_truncate = false; will_truncate = false;
audit_inode(nd->name, file->f_path.dentry, 0); audit_inode(nd->name, file->f_path.dentry, 0);
dput(dentry);
goto opened; goto opened;
} }