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-rw-r--r--fs/sysfs/file.c16
-rw-r--r--fs/sysfs/group.c83
-rw-r--r--fs/sysfs/inode.c4
-rw-r--r--fs/sysfs/mount.c2
-rw-r--r--fs/sysfs/sysfs.h2
5 files changed, 87 insertions, 20 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index ade9a7e6a75..e7735f643cd 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -135,7 +135,7 @@ sysfs_read_file(struct file *file, char __user *buf, size_t count, loff_t *ppos)
goto out;
}
pr_debug("%s: count = %zd, ppos = %lld, buf = %s\n",
- __FUNCTION__, count, *ppos, buffer->page);
+ __func__, count, *ppos, buffer->page);
retval = simple_read_from_buffer(buf, count, ppos, buffer->page,
buffer->count);
out:
@@ -477,11 +477,10 @@ const struct file_operations sysfs_file_operations = {
.poll = sysfs_poll,
};
-
-int sysfs_add_file(struct sysfs_dirent *dir_sd, const struct attribute *attr,
- int type)
+int sysfs_add_file_mode(struct sysfs_dirent *dir_sd,
+ const struct attribute *attr, int type, mode_t amode)
{
- umode_t mode = (attr->mode & S_IALLUGO) | S_IFREG;
+ umode_t mode = (amode & S_IALLUGO) | S_IFREG;
struct sysfs_addrm_cxt acxt;
struct sysfs_dirent *sd;
int rc;
@@ -502,6 +501,13 @@ int sysfs_add_file(struct sysfs_dirent *dir_sd, const struct attribute *attr,
}
+int sysfs_add_file(struct sysfs_dirent *dir_sd, const struct attribute *attr,
+ int type)
+{
+ return sysfs_add_file_mode(dir_sd, attr, type, attr->mode);
+}
+
+
/**
* sysfs_create_file - create an attribute file for an object.
* @kobj: object we're creating for.
diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c
index 47790491503..eeba38417b1 100644
--- a/fs/sysfs/group.c
+++ b/fs/sysfs/group.c
@@ -23,35 +23,50 @@ static void remove_files(struct sysfs_dirent *dir_sd, struct kobject *kobj,
int i;
for (i = 0, attr = grp->attrs; *attr; i++, attr++)
- if (!grp->is_visible ||
- grp->is_visible(kobj, *attr, i))
- sysfs_hash_and_remove(dir_sd, (*attr)->name);
+ sysfs_hash_and_remove(dir_sd, (*attr)->name);
}
static int create_files(struct sysfs_dirent *dir_sd, struct kobject *kobj,
- const struct attribute_group *grp)
+ const struct attribute_group *grp, int update)
{
struct attribute *const* attr;
int error = 0, i;
- for (i = 0, attr = grp->attrs; *attr && !error; i++, attr++)
- if (!grp->is_visible ||
- grp->is_visible(kobj, *attr, i))
- error |=
- sysfs_add_file(dir_sd, *attr, SYSFS_KOBJ_ATTR);
+ for (i = 0, attr = grp->attrs; *attr && !error; i++, attr++) {
+ mode_t mode = 0;
+
+ /* in update mode, we're changing the permissions or
+ * visibility. Do this by first removing then
+ * re-adding (if required) the file */
+ if (update)
+ sysfs_hash_and_remove(dir_sd, (*attr)->name);
+ if (grp->is_visible) {
+ mode = grp->is_visible(kobj, *attr, i);
+ if (!mode)
+ continue;
+ }
+ error = sysfs_add_file_mode(dir_sd, *attr, SYSFS_KOBJ_ATTR,
+ (*attr)->mode | mode);
+ if (unlikely(error))
+ break;
+ }
if (error)
remove_files(dir_sd, kobj, grp);
return error;
}
-int sysfs_create_group(struct kobject * kobj,
- const struct attribute_group * grp)
+static int internal_create_group(struct kobject *kobj, int update,
+ const struct attribute_group *grp)
{
struct sysfs_dirent *sd;
int error;
- BUG_ON(!kobj || !kobj->sd);
+ BUG_ON(!kobj || (!update && !kobj->sd));
+
+ /* Updates may happen before the object has been instantiated */
+ if (unlikely(update && !kobj->sd))
+ return -EINVAL;
if (grp->name) {
error = sysfs_create_subdir(kobj, grp->name, &sd);
@@ -60,7 +75,7 @@ int sysfs_create_group(struct kobject * kobj,
} else
sd = kobj->sd;
sysfs_get(sd);
- error = create_files(sd, kobj, grp);
+ error = create_files(sd, kobj, grp, update);
if (error) {
if (grp->name)
sysfs_remove_subdir(sd);
@@ -69,6 +84,47 @@ int sysfs_create_group(struct kobject * kobj,
return error;
}
+/**
+ * sysfs_create_group - given a directory kobject, create an attribute group
+ * @kobj: The kobject to create the group on
+ * @grp: The attribute group to create
+ *
+ * This function creates a group for the first time. It will explicitly
+ * warn and error if any of the attribute files being created already exist.
+ *
+ * Returns 0 on success or error.
+ */
+int sysfs_create_group(struct kobject *kobj,
+ const struct attribute_group *grp)
+{
+ return internal_create_group(kobj, 0, grp);
+}
+
+/**
+ * sysfs_update_group - given a directory kobject, create an attribute group
+ * @kobj: The kobject to create the group on
+ * @grp: The attribute group to create
+ *
+ * This function updates an attribute group. Unlike
+ * sysfs_create_group(), it will explicitly not warn or error if any
+ * of the attribute files being created already exist. Furthermore,
+ * if the visibility of the files has changed through the is_visible()
+ * callback, it will update the permissions and add or remove the
+ * relevant files.
+ *
+ * The primary use for this function is to call it after making a change
+ * that affects group visibility.
+ *
+ * Returns 0 on success or error.
+ */
+int sysfs_update_group(struct kobject *kobj,
+ const struct attribute_group *grp)
+{
+ return internal_create_group(kobj, 1, grp);
+}
+
+
+
void sysfs_remove_group(struct kobject * kobj,
const struct attribute_group * grp)
{
@@ -95,4 +151,5 @@ void sysfs_remove_group(struct kobject * kobj,
EXPORT_SYMBOL_GPL(sysfs_create_group);
+EXPORT_SYMBOL_GPL(sysfs_update_group);
EXPORT_SYMBOL_GPL(sysfs_remove_group);
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index d9262f74f94..eb53c632f85 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -30,7 +30,7 @@ static const struct address_space_operations sysfs_aops = {
static struct backing_dev_info sysfs_backing_dev_info = {
.ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK,
+ .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
};
static const struct inode_operations sysfs_inode_operations ={
@@ -59,6 +59,8 @@ int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
if (error)
return error;
+ iattr->ia_valid &= ~ATTR_SIZE; /* ignore size changes */
+
error = inode_setattr(inode, iattr);
if (error)
return error;
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index 74168266cd5..14f0023984d 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -61,7 +61,7 @@ static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
/* instantiate and link root dentry */
root = d_alloc_root(inode);
if (!root) {
- pr_debug("%s: could not get root dentry!\n",__FUNCTION__);
+ pr_debug("%s: could not get root dentry!\n",__func__);
iput(inode);
return -ENOMEM;
}
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index ff17f8da9b4..ce4e15f8aae 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -154,6 +154,8 @@ extern const struct file_operations sysfs_file_operations;
int sysfs_add_file(struct sysfs_dirent *dir_sd,
const struct attribute *attr, int type);
+int sysfs_add_file_mode(struct sysfs_dirent *dir_sd,
+ const struct attribute *attr, int type, mode_t amode);
/*
* bin.c
*/
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-02-07 20:05:35 +0000