[PATCH 4/8] afs: Rearrange fs/afs/proc.c to remove remaining predeclarations.

From: David Howells
Date: Wed May 23 2018 - 07:23:45 EST

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Rearrange fs/afs/proc.c to get rid of all the remaining predeclarations.

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---

fs/afs/proc.c | 352 ++++++++++++++++++++++++++-------------------------------
1 file changed, 160 insertions(+), 192 deletions(-)

diff --git a/fs/afs/proc.c b/fs/afs/proc.c
index b20098b7b7ee..b45ee7576aa8 100644
--- a/fs/afs/proc.c
+++ b/fs/afs/proc.c
@@ -27,72 +27,8 @@ static inline struct afs_net *afs_seq2net(struct seq_file *m)
return &__afs_net; // TODO: use seq_file_net(m)
}

-static void *afs_proc_cells_start(struct seq_file *p, loff_t *pos);
-static void *afs_proc_cells_next(struct seq_file *p, void *v, loff_t *pos);
-static void afs_proc_cells_stop(struct seq_file *p, void *v);
-static int afs_proc_cells_show(struct seq_file *m, void *v);
-
-static const struct seq_operations afs_proc_cells_ops = {
- .start = afs_proc_cells_start,
- .next = afs_proc_cells_next,
- .stop = afs_proc_cells_stop,
- .show = afs_proc_cells_show,
-};
-
-static void *afs_proc_cell_volumes_start(struct seq_file *p, loff_t *pos);
-static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
- loff_t *pos);
-static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v);
-static int afs_proc_cell_volumes_show(struct seq_file *m, void *v);
-
-static const struct seq_operations afs_proc_cell_volumes_ops = {
- .start = afs_proc_cell_volumes_start,
- .next = afs_proc_cell_volumes_next,
- .stop = afs_proc_cell_volumes_stop,
- .show = afs_proc_cell_volumes_show,
-};
-
-static void *afs_proc_cell_vlservers_start(struct seq_file *p, loff_t *pos);
-static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
- loff_t *pos);
-static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v);
-static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v);
-
-static const struct seq_operations afs_proc_cell_vlservers_ops = {
- .start = afs_proc_cell_vlservers_start,
- .next = afs_proc_cell_vlservers_next,
- .stop = afs_proc_cell_vlservers_stop,
- .show = afs_proc_cell_vlservers_show,
-};
-
-static void *afs_proc_servers_start(struct seq_file *p, loff_t *pos);
-static void *afs_proc_servers_next(struct seq_file *p, void *v,
- loff_t *pos);
-static void afs_proc_servers_stop(struct seq_file *p, void *v);
-static int afs_proc_servers_show(struct seq_file *m, void *v);
-
-static const struct seq_operations afs_proc_servers_ops = {
- .start = afs_proc_servers_start,
- .next = afs_proc_servers_next,
- .stop = afs_proc_servers_stop,
- .show = afs_proc_servers_show,
-};
-
-static void *afs_proc_sysname_start(struct seq_file *p, loff_t *pos);
-static void *afs_proc_sysname_next(struct seq_file *p, void *v,
- loff_t *pos);
-static void afs_proc_sysname_stop(struct seq_file *p, void *v);
-static int afs_proc_sysname_show(struct seq_file *m, void *v);
-
-static const struct seq_operations afs_proc_sysname_ops = {
- .start = afs_proc_sysname_start,
- .next = afs_proc_sysname_next,
- .stop = afs_proc_sysname_stop,
- .show = afs_proc_sysname_show,
-};
-
/*
- * display a header line followed by a load of cell lines
+ * Display the list of cells known to the namespace.
*/
static int afs_proc_cells_show(struct seq_file *m, void *v)
{
@@ -110,38 +46,31 @@ static int afs_proc_cells_show(struct seq_file *m, void *v)
return 0;
}

-/*
- * set up the iterator to start reading from the cells list and return the
- * first item
- */
static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
__acquires(rcu)
{
- struct afs_net *net = afs_seq2net(m);
-
rcu_read_lock();
- return seq_list_start_head(&net->proc_cells, *_pos);
+ return seq_list_start_head(&afs_seq2net(m)->proc_cells, *_pos);
}

-/*
- * move to next cell in cells list
- */
static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos)
{
- struct afs_net *net = afs_seq2net(m);
-
- return seq_list_next(v, &net->proc_cells, pos);
+ return seq_list_next(v, &afs_seq2net(m)->proc_cells, pos);
}

-/*
- * clean up after reading from the cells list
- */
static void afs_proc_cells_stop(struct seq_file *m, void *v)
__releases(rcu)
{
rcu_read_unlock();
}

+static const struct seq_operations afs_proc_cells_ops = {
+ .start = afs_proc_cells_start,
+ .next = afs_proc_cells_next,
+ .stop = afs_proc_cells_stop,
+ .show = afs_proc_cells_show,
+};
+
/*
* handle writes to /proc/fs/afs/cells
* - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
@@ -230,6 +159,9 @@ static const struct file_operations afs_proc_cells_fops = {
.release = seq_release,
};

+/*
+ * Read the name of the current workstation cell.
+ */
static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
size_t size, loff_t *_pos)
{
@@ -270,8 +202,10 @@ static ssize_t afs_proc_rootcell_read(struct file *file, char __user *buf,
}

/*
- * handle writes to /proc/fs/afs/rootcell
- * - to initialize rootcell: echo "cell.name:192.168.231.14"
+ * Set the current workstation cell and optionally supply its list of volume
+ * location servers.
+ *
+ * echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell
*/
static ssize_t afs_proc_rootcell_write(struct file *file,
const char __user *buf,
@@ -326,7 +260,7 @@ static const char afs_vol_types[3][3] = {
};

/*
- * display a header line followed by a load of volume lines
+ * Display the list of volumes known to a cell.
*/
static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
{
@@ -346,36 +280,23 @@ static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
return 0;
}

-/*
- * set up the iterator to start reading from the cells list and return the
- * first item
- */
static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
__acquires(cell->proc_lock)
{
struct afs_cell *cell = PDE_DATA(file_inode(m->file));

- _enter("cell=%p pos=%Ld", cell, *_pos);
-
read_lock(&cell->proc_lock);
return seq_list_start_head(&cell->proc_volumes, *_pos);
}

-/*
- * move to next cell in cells list
- */
static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
loff_t *_pos)
{
struct afs_cell *cell = PDE_DATA(file_inode(p->file));

- _enter("cell=%p pos=%Ld", cell, *_pos);
return seq_list_next(v, &cell->proc_volumes, _pos);
}

-/*
- * clean up after reading from the cells list
- */
static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v)
__releases(cell->proc_lock)
{
@@ -384,8 +305,15 @@ static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v)
read_unlock(&cell->proc_lock);
}

+static const struct seq_operations afs_proc_cell_volumes_ops = {
+ .start = afs_proc_cell_volumes_start,
+ .next = afs_proc_cell_volumes_next,
+ .stop = afs_proc_cell_volumes_stop,
+ .show = afs_proc_cell_volumes_show,
+};
+
/*
- * display a header line followed by a load of volume lines
+ * Display the list of Volume Location servers we're using for a cell.
*/
static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
{
@@ -402,10 +330,6 @@ static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
return 0;
}

-/*
- * set up the iterator to start reading from the cells list and return the
- * first item
- */
static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
__acquires(rcu)
{
@@ -428,9 +352,6 @@ static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
return alist->addrs + pos;
}

-/*
- * move to next cell in cells list
- */
static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
loff_t *_pos)
{
@@ -448,17 +369,48 @@ static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
return alist->addrs + pos;
}

-/*
- * clean up after reading from the cells list
- */
static void afs_proc_cell_vlservers_stop(struct seq_file *p, void *v)
__releases(rcu)
{
rcu_read_unlock();
}

+static const struct seq_operations afs_proc_cell_vlservers_ops = {
+ .start = afs_proc_cell_vlservers_start,
+ .next = afs_proc_cell_vlservers_next,
+ .stop = afs_proc_cell_vlservers_stop,
+ .show = afs_proc_cell_vlservers_show,
+};
+
+static int afs_proc_cell_vlservers_open(struct inode *inode, struct file *file)
+{
+ struct afs_cell *cell;
+ struct seq_file *m;
+ int ret;
+
+ cell = PDE_DATA(inode);
+ if (!cell)
+ return -ENOENT;
+
+ ret = seq_open(file, &afs_proc_cell_vlservers_ops);
+ if (ret<0)
+ return ret;
+
+ m = file->private_data;
+ m->private = cell;
+
+ return 0;
+}
+
+static const struct file_operations afs_proc_cell_vlservers_fops = {
+ .open = afs_proc_cell_vlservers_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
/*
- * display a header line followed by a load of volume lines
+ * Display the list of fileservers we're using within a namespace.
*/
static int afs_proc_servers_show(struct seq_file *m, void *v)
{
@@ -479,82 +431,99 @@ static int afs_proc_servers_show(struct seq_file *m, void *v)
return 0;
}

-/*
- * Set up the iterator to start reading from the server list and return the
- * first item.
- */
static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
__acquires(rcu)
{
- struct afs_net *net = afs_seq2net(m);
-
rcu_read_lock();
- return seq_hlist_start_head_rcu(&net->fs_proc, *_pos);
+ return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos);
}

-/*
- * move to next cell in cells list
- */
static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
{
- struct afs_net *net = afs_seq2net(m);
-
- return seq_hlist_next_rcu(v, &net->fs_proc, _pos);
+ return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos);
}

-/*
- * clean up after reading from the cells list
- */
static void afs_proc_servers_stop(struct seq_file *p, void *v)
__releases(rcu)
{
rcu_read_unlock();
}

-void afs_put_sysnames(struct afs_sysnames *sysnames)
-{
- int i;
+static const struct seq_operations afs_proc_servers_ops = {
+ .start = afs_proc_servers_start,
+ .next = afs_proc_servers_next,
+ .stop = afs_proc_servers_stop,
+ .show = afs_proc_servers_show,
+};

- if (sysnames && refcount_dec_and_test(&sysnames->usage)) {
- for (i = 0; i < sysnames->nr; i++)
- if (sysnames->subs[i] != afs_init_sysname &&
- sysnames->subs[i] != sysnames->blank)
- kfree(sysnames->subs[i]);
- }
+static int afs_proc_servers_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &afs_proc_servers_ops);
}

+static const struct file_operations afs_proc_servers_fops = {
+ .open = afs_proc_servers_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
/*
- * Handle opening of /proc/fs/afs/sysname. If it is opened for writing, we
- * assume the caller wants to change the substitution list and we allocate a
- * buffer to hold the list.
+ * Display the list of strings that may be substituted for the @sys pathname
+ * macro.
*/
-static int afs_proc_sysname_open(struct inode *inode, struct file *file)
+static int afs_proc_sysname_show(struct seq_file *m, void *v)
{
- struct afs_sysnames *sysnames;
- struct seq_file *m;
- int ret;
+ struct afs_net *net = afs_seq2net(m);
+ struct afs_sysnames *sysnames = net->sysnames;
+ unsigned int i = (unsigned long)v - 1;

- ret = seq_open(file, &afs_proc_sysname_ops);
- if (ret < 0)
- return ret;
+ if (i < sysnames->nr)
+ seq_printf(m, "%s\n", sysnames->subs[i]);
+ return 0;
+}

- if (file->f_mode & FMODE_WRITE) {
- sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
- if (!sysnames) {
- seq_release(inode, file);
- return -ENOMEM;
- }
+static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos)
+ __acquires(&net->sysnames_lock)
+{
+ struct afs_net *net = afs_seq2net(m);
+ struct afs_sysnames *names = net->sysnames;

- refcount_set(&sysnames->usage, 1);
- m = file->private_data;
- m->private = sysnames;
- }
+ read_lock(&net->sysnames_lock);

- return 0;
+ if (*pos >= names->nr)
+ return NULL;
+ return (void *)(unsigned long)(*pos + 1);
+}
+
+static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ struct afs_net *net = afs_seq2net(m);
+ struct afs_sysnames *names = net->sysnames;
+
+ *pos += 1;
+ if (*pos >= names->nr)
+ return NULL;
+ return (void *)(unsigned long)(*pos + 1);
+}
+
+static void afs_proc_sysname_stop(struct seq_file *m, void *v)
+ __releases(&net->sysnames_lock)
+{
+ struct afs_net *net = afs_seq2net(m);
+
+ read_unlock(&net->sysnames_lock);
}

+static const struct seq_operations afs_proc_sysname_ops = {
+ .start = afs_proc_sysname_start,
+ .next = afs_proc_sysname_next,
+ .stop = afs_proc_sysname_stop,
+ .show = afs_proc_sysname_show,
+};
+
/*
- * Handle writes to /proc/fs/afs/sysname to set the @sys substitution.
+ * Allow the @sys substitution to be configured.
*/
static ssize_t afs_proc_sysname_write(struct file *file,
const char __user *buf,
@@ -638,6 +607,18 @@ static ssize_t afs_proc_sysname_write(struct file *file,
goto out;
}

+void afs_put_sysnames(struct afs_sysnames *sysnames)
+{
+ int i;
+
+ if (sysnames && refcount_dec_and_test(&sysnames->usage)) {
+ for (i = 0; i < sysnames->nr; i++)
+ if (sysnames->subs[i] != afs_init_sysname &&
+ sysnames->subs[i] != sysnames->blank)
+ kfree(sysnames->subs[i]);
+ }
+}
+
static int afs_proc_sysname_release(struct inode *inode, struct file *file)
{
struct afs_sysnames *sysnames, *kill = NULL;
@@ -663,47 +644,34 @@ static int afs_proc_sysname_release(struct inode *inode, struct file *file)
return seq_release(inode, file);
}

-static int afs_proc_sysname_show(struct seq_file *m, void *v)
-{
- struct afs_net *net = afs_seq2net(m);
- struct afs_sysnames *sysnames = net->sysnames;
- unsigned int i = (unsigned long)v - 1;
-
- if (i < sysnames->nr)
- seq_printf(m, "%s\n", sysnames->subs[i]);
- return 0;
-}
-
-static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos)
- __acquires(&net->sysnames_lock)
+/*
+ * Handle opening of /proc/fs/afs/sysname. If it is opened for writing, we
+ * assume the caller wants to change the substitution list and we allocate a
+ * buffer to hold the list.
+ */
+static int afs_proc_sysname_open(struct inode *inode, struct file *file)
{
- struct afs_net *net = afs_seq2net(m);
- struct afs_sysnames *names = net->sysnames;
-
- read_lock(&net->sysnames_lock);
-
- if (*pos >= names->nr)
- return NULL;
- return (void *)(unsigned long)(*pos + 1);
-}
+ struct afs_sysnames *sysnames;
+ struct seq_file *m;
+ int ret;

-static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos)
-{
- struct afs_net *net = afs_seq2net(m);
- struct afs_sysnames *names = net->sysnames;
+ ret = seq_open(file, &afs_proc_sysname_ops);
+ if (ret < 0)
+ return ret;

- *pos += 1;
- if (*pos >= names->nr)
- return NULL;
- return (void *)(unsigned long)(*pos + 1);
-}
+ if (file->f_mode & FMODE_WRITE) {
+ sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
+ if (!sysnames) {
+ seq_release(inode, file);
+ return -ENOMEM;
+ }

-static void afs_proc_sysname_stop(struct seq_file *m, void *v)
- __releases(&net->sysnames_lock)
-{
- struct afs_net *net = afs_seq2net(m);
+ refcount_set(&sysnames->usage, 1);
+ m = file->private_data;
+ m->private = sysnames;
+ }

- read_unlock(&net->sysnames_lock);
+ return 0;
}

static const struct file_operations afs_proc_sysname_fops = {

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