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configfs: fold configfs_attach_attr into configfs_lookup

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This makes it more clear what gets added to the dcache and prepares
for an additional locking fix.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2021-08-25 07:50:32 +02:00
parent 899587c8d0
commit d07f132a22
1 changed files with 24 additions and 49 deletions
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73
fs/configfs/dir.c
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@ -45,7 +45,7 @@ static void configfs_d_iput(struct dentry * dentry,
/*
* Set sd->s_dentry to null only when this dentry is the one
* that is going to be killed. Otherwise configfs_d_iput may
* run just after configfs_attach_attr and set sd->s_dentry to
* run just after configfs_lookup and set sd->s_dentry to
* NULL even it's still in use.
*/
if (sd->s_dentry == dentry)
@ -417,44 +417,13 @@ static void configfs_remove_dir(struct config_item * item)
dput(dentry);
}
/* attaches attribute's configfs_dirent to the dentry corresponding to the
* attribute file
*/
static int configfs_attach_attr(struct configfs_dirent * sd, struct dentry * dentry)
{
struct configfs_attribute * attr = sd->s_element;
struct inode *inode;
spin_lock(&configfs_dirent_lock);
dentry->d_fsdata = configfs_get(sd);
sd->s_dentry = dentry;
spin_unlock(&configfs_dirent_lock);
inode = configfs_create(dentry, (attr->ca_mode & S_IALLUGO) | S_IFREG);
if (IS_ERR(inode)) {
configfs_put(sd);
return PTR_ERR(inode);
}
if (sd->s_type & CONFIGFS_ITEM_BIN_ATTR) {
inode->i_size = 0;
inode->i_fop = &configfs_bin_file_operations;
} else {
inode->i_size = PAGE_SIZE;
inode->i_fop = &configfs_file_operations;
}
d_add(dentry, inode);
return 0;
}
static struct dentry * configfs_lookup(struct inode *dir,
struct dentry *dentry,
unsigned int flags)
{
struct configfs_dirent * parent_sd = dentry->d_parent->d_fsdata;
struct configfs_dirent * sd;
int found = 0;
int err;
struct inode *inode = NULL;
if (dentry->d_name.len > NAME_MAX)
return ERR_PTR(-ENAMETOOLONG);
@ -471,28 +440,34 @@ static struct dentry * configfs_lookup(struct inode *dir,
return ERR_PTR(-ENOENT);
list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
if (sd->s_type & CONFIGFS_NOT_PINNED) {
const unsigned char * name = configfs_get_name(sd);
if ((sd->s_type & CONFIGFS_NOT_PINNED) &&
!strcmp(configfs_get_name(sd), dentry->d_name.name)) {
struct configfs_attribute *attr = sd->s_element;
umode_t mode = (attr->ca_mode & S_IALLUGO) | S_IFREG;
if (strcmp(name, dentry->d_name.name))
continue;
spin_lock(&configfs_dirent_lock);
dentry->d_fsdata = configfs_get(sd);
sd->s_dentry = dentry;
spin_unlock(&configfs_dirent_lock);
found = 1;
err = configfs_attach_attr(sd, dentry);
inode = configfs_create(dentry, mode);
if (IS_ERR(inode)) {
configfs_put(sd);
return ERR_CAST(inode);
}
if (sd->s_type & CONFIGFS_ITEM_BIN_ATTR) {
inode->i_size = 0;
inode->i_fop = &configfs_bin_file_operations;
} else {
inode->i_size = PAGE_SIZE;
inode->i_fop = &configfs_file_operations;
}
break;
}
}
if (!found) {
/*
* If it doesn't exist and it isn't a NOT_PINNED item,
* it must be negative.
*/
d_add(dentry, NULL);
return NULL;
}
return ERR_PTR(err);
d_add(dentry, inode);
return NULL;
}
/*