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procfs: switch instantiate_t to d_splice_alias()

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... and get rid of pointless struct inode *dir argument of those,
while we are at it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2018-05-03 09:21:05 -04:00
parent 9883638641
commit 0168b9e38c
4 changed files with 65 additions and 79 deletions
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30
fs/proc/fd.c
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@@ -179,17 +179,16 @@ struct fd_data {
unsigned fd;
};
static int
proc_fd_instantiate(struct inode *dir, struct dentry *dentry,
struct task_struct *task, const void *ptr)
static struct dentry *proc_fd_instantiate(struct dentry *dentry,
struct task_struct *task, const void *ptr)
{
const struct fd_data *data = ptr;
struct proc_inode *ei;
struct inode *inode;
inode = proc_pid_make_inode(dir->i_sb, task, S_IFLNK);
inode = proc_pid_make_inode(dentry->d_sb, task, S_IFLNK);
if (!inode)
return -ENOENT;
return ERR_PTR(-ENOENT);
ei = PROC_I(inode);
ei->fd = data->fd;
@@ -201,8 +200,7 @@ proc_fd_instantiate(struct inode *dir, struct dentry *dentry,
tid_fd_update_inode(task, inode, data->mode);
d_set_d_op(dentry, &tid_fd_dentry_operations);
d_add(dentry, inode);
return 0;
return d_splice_alias(inode, dentry);
}
static struct dentry *proc_lookupfd_common(struct inode *dir,
@@ -210,8 +208,8 @@ static struct dentry *proc_lookupfd_common(struct inode *dir,
instantiate_t instantiate)
{
struct task_struct *task = get_proc_task(dir);
int result = -ENOENT;
struct fd_data data = {.fd = name_to_int(&dentry->d_name)};
struct dentry *result = ERR_PTR(-ENOENT);
if (!task)
goto out_no_task;
@@ -220,11 +218,11 @@ static struct dentry *proc_lookupfd_common(struct inode *dir,
if (!tid_fd_mode(task, data.fd, &data.mode))
goto out;
result = instantiate(dir, dentry, task, &data);
result = instantiate(dentry, task, &data);
out:
put_task_struct(task);
out_no_task:
return ERR_PTR(result);
return result;
}
static int proc_readfd_common(struct file *file, struct dir_context *ctx,
@@ -320,17 +318,16 @@ const struct inode_operations proc_fd_inode_operations = {
.setattr = proc_setattr,
};
static int
proc_fdinfo_instantiate(struct inode *dir, struct dentry *dentry,
struct task_struct *task, const void *ptr)
static struct dentry *proc_fdinfo_instantiate(struct dentry *dentry,
struct task_struct *task, const void *ptr)
{
const struct fd_data *data = ptr;
struct proc_inode *ei;
struct inode *inode;
inode = proc_pid_make_inode(dir->i_sb, task, S_IFREG | S_IRUSR);
inode = proc_pid_make_inode(dentry->d_sb, task, S_IFREG | S_IRUSR);
if (!inode)
return -ENOENT;
return ERR_PTR(-ENOENT);
ei = PROC_I(inode);
ei->fd = data->fd;
@@ -339,8 +336,7 @@ proc_fdinfo_instantiate(struct inode *dir, struct dentry *dentry,
tid_fd_update_inode(task, inode, 0);
d_set_d_op(dentry, &tid_fd_dentry_operations);
d_add(dentry, inode);
return 0;
return d_splice_alias(inode, dentry);
}
static struct dentry *