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afs: simplify procfs code 

Use remove_proc_subtree to remove the whole subtree on cleanup, and
unwind the registration loop into individual calls.  Switch to use
proc_create_seq where applicable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2018-04-13 20:45:09 +02:00
parent b8b1483d79
commit 353861cf05
1 changed files with 15 additions and 119 deletions
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134
fs/afs/proc.c
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@ -62,7 +62,6 @@ static const struct file_operations afs_proc_rootcell_fops = {
.llseek = no_llseek,
};
static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file);
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);
@ -76,15 +75,6 @@ static const struct seq_operations afs_proc_cell_volumes_ops = {
.show = afs_proc_cell_volumes_show,
};
static const struct file_operations afs_proc_cell_volumes_fops = {
.open = afs_proc_cell_volumes_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static int afs_proc_cell_vlservers_open(struct inode *inode,
struct file *file);
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);
@ -98,14 +88,6 @@ static const struct seq_operations afs_proc_cell_vlservers_ops = {
.show = afs_proc_cell_vlservers_show,
};
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,
};
static int afs_proc_servers_open(struct inode *inode, struct file *file);
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);
@ -119,13 +101,6 @@ static const struct seq_operations afs_proc_servers_ops = {
.show = afs_proc_servers_show,
};
static const struct file_operations afs_proc_servers_fops = {
.open = afs_proc_servers_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static int afs_proc_sysname_open(struct inode *inode, struct file *file);
static int afs_proc_sysname_release(struct inode *inode, struct file *file);
static void *afs_proc_sysname_start(struct seq_file *p, loff_t *pos);
@ -152,7 +127,7 @@ static const struct file_operations afs_proc_sysname_fops = {
.write = afs_proc_sysname_write,
};
static const struct file_operations afs_proc_stats_fops;
static int afs_proc_stats_show(struct seq_file *m, void *v);
/*
* initialise the /proc/fs/afs/ directory
@ -167,8 +142,8 @@ int afs_proc_init(struct afs_net *net)
if (!proc_create("cells", 0644, net->proc_afs, &afs_proc_cells_fops) ||
!proc_create("rootcell", 0644, net->proc_afs, &afs_proc_rootcell_fops) ||
!proc_create("servers", 0644, net->proc_afs, &afs_proc_servers_fops) ||
!proc_create("stats", 0644, net->proc_afs, &afs_proc_stats_fops) ||
!proc_create_seq("servers", 0644, net->proc_afs, &afs_proc_servers_ops) ||
!proc_create_single("stats", 0644, net->proc_afs, afs_proc_stats_show) ||
!proc_create("sysname", 0644, net->proc_afs, &afs_proc_sysname_fops))
goto error_tree;
@ -196,16 +171,7 @@ void afs_proc_cleanup(struct afs_net *net)
*/
static int afs_proc_cells_open(struct inode *inode, struct file *file)
{
struct seq_file *m;
int ret;
ret = seq_open(file, &afs_proc_cells_ops);
if (ret < 0)
return ret;
m = file->private_data;
m->private = PDE_DATA(inode);
return 0;
return seq_open(file, &afs_proc_cells_ops);
}
/*
@ -430,10 +396,11 @@ int afs_proc_cell_setup(struct afs_net *net, struct afs_cell *cell)
if (!dir)
goto error_dir;
if (!proc_create_data("vlservers", 0, dir,
&afs_proc_cell_vlservers_fops, cell) ||
!proc_create_data("volumes", 0, dir,
&afs_proc_cell_volumes_fops, cell))
if (!proc_create_seq_data("vlservers", 0, dir,
&afs_proc_cell_vlservers_ops, cell))
goto error_tree;
if (!proc_create_seq_data("volumes", 0, dir, &afs_proc_cell_volumes_ops,
cell))
goto error_tree;
_leave(" = 0");
@ -458,29 +425,6 @@ void afs_proc_cell_remove(struct afs_net *net, struct afs_cell *cell)
_leave("");
}
/*
* open "/proc/fs/afs/<cell>/volumes" which provides a summary of extant cells
*/
static int afs_proc_cell_volumes_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_volumes_ops);
if (ret < 0)
return ret;
m = file->private_data;
m->private = cell;
return 0;
}
/*
* set up the iterator to start reading from the cells list and return the
* first item
@ -488,7 +432,7 @@ static int afs_proc_cell_volumes_open(struct inode *inode, struct file *file)
static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
__acquires(cell->proc_lock)
{
struct afs_cell *cell = m->private;
struct afs_cell *cell = PDE_DATA(file_inode(m->file));
_enter("cell=%p pos=%Ld", cell, *_pos);
@ -502,7 +446,7 @@ static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
loff_t *_pos)
{
struct afs_cell *cell = p->private;
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);
@ -514,7 +458,7 @@ static void *afs_proc_cell_volumes_next(struct seq_file *p, void *v,
static void afs_proc_cell_volumes_stop(struct seq_file *p, void *v)
__releases(cell->proc_lock)
{
struct afs_cell *cell = p->private;
struct afs_cell *cell = PDE_DATA(file_inode(p->file));
read_unlock(&cell->proc_lock);
}
@ -530,7 +474,7 @@ static const char afs_vol_types[3][3] = {
*/
static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
{
struct afs_cell *cell = m->private;
struct afs_cell *cell = PDE_DATA(file_inode(m->file));
struct afs_volume *vol = list_entry(v, struct afs_volume, proc_link);
/* Display header on line 1 */
@ -546,30 +490,6 @@ static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
return 0;
}
/*
* open "/proc/fs/afs/<cell>/vlservers" which provides a list of volume
* location server
*/
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;
}
/*
* set up the iterator to start reading from the cells list and return the
* first item
@ -578,7 +498,7 @@ static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
__acquires(rcu)
{
struct afs_addr_list *alist;
struct afs_cell *cell = m->private;
struct afs_cell *cell = PDE_DATA(file_inode(m->file));
loff_t pos = *_pos;
rcu_read_lock();
@ -603,7 +523,7 @@ static void *afs_proc_cell_vlservers_next(struct seq_file *p, void *v,
loff_t *_pos)
{
struct afs_addr_list *alist;
struct afs_cell *cell = p->private;
struct afs_cell *cell = PDE_DATA(file_inode(p->file));
loff_t pos;
alist = rcu_dereference(cell->vl_addrs);
@ -643,15 +563,6 @@ static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
return 0;
}
/*
* open "/proc/fs/afs/servers" which provides a summary of active
* servers
*/
static int afs_proc_servers_open(struct inode *inode, struct file *file)
{
return seq_open(file, &afs_proc_servers_ops);
}
/*
* Set up the iterator to start reading from the server list and return the
* first item.
@ -931,18 +842,3 @@ static int afs_proc_stats_show(struct seq_file *m, void *v)
atomic_long_read(&net->n_store_bytes));
return 0;
}
/*
* Open "/proc/fs/afs/stats" to allow reading of the stat counters.
*/
static int afs_proc_stats_open(struct inode *inode, struct file *file)
{
return single_open(file, afs_proc_stats_show, NULL);
}
static const struct file_operations afs_proc_stats_fops = {
.open = afs_proc_stats_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};