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powerpc/spufs: only add ".ctx" file with "debug" mount option

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Currently, the .ctx debug file in spu context directories is always
present.

We'd prefer to prevent users from relying on this file, so add a
"debug" mount option to spufs. The .ctx file will only be added to
the context directories when this option is present.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
This commit is contained in:
Jeremy Kerr 2008-07-03 11:42:20 +10:00
parent 6f7dde812d
commit 2c3e47871d
3 changed files with 38 additions and 8 deletions
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5
arch/powerpc/platforms/cell/spufs/file.c
View file

@ -2645,7 +2645,6 @@ struct spufs_tree_descr spufs_dir_contents[] = {
{ "tid", &spufs_tid_fops, 0444, },
{ "stat", &spufs_stat_fops, 0444, },
{ "switch_log", &spufs_switch_log_fops, 0444 },
{ ".ctx", &spufs_ctx_fops, 0444, },
{},
};
@ -2671,6 +2670,10 @@ struct spufs_tree_descr spufs_dir_nosched_contents[] = {
{ "object-id", &spufs_object_id_ops, 0666, },
{ "tid", &spufs_tid_fops, 0444, },
{ "stat", &spufs_stat_fops, 0444, },
{},
};
struct spufs_tree_descr spufs_dir_debug_contents[] = {
{ ".ctx", &spufs_ctx_fops, 0444, },
{},
};

40
arch/powerpc/platforms/cell/spufs/inode.c
View file

@ -42,10 +42,19 @@
#include "spufs.h"
struct spufs_sb_info {
int debug;
};
static struct kmem_cache *spufs_inode_cache;
char *isolated_loader;
static int isolated_loader_size;
static struct spufs_sb_info *spufs_get_sb_info(struct super_block *sb)
{
return sb->s_fs_info;
}
static struct inode *
spufs_alloc_inode(struct super_block *sb)
{
@ -280,6 +289,13 @@ spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
if (ret)
goto out_free_ctx;
if (spufs_get_sb_info(dir->i_sb)->debug)
ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
mode, ctx);
if (ret)
goto out_free_ctx;
d_instantiate(dentry, inode);
dget(dentry);
dir->i_nlink++;
@ -640,18 +656,19 @@ long spufs_create(struct nameidata *nd, unsigned int flags, mode_t mode,
/* File system initialization */
enum {
Opt_uid, Opt_gid, Opt_mode, Opt_err,
Opt_uid, Opt_gid, Opt_mode, Opt_debug, Opt_err,
};
static match_table_t spufs_tokens = {
{ Opt_uid, "uid=%d" },
{ Opt_gid, "gid=%d" },
{ Opt_mode, "mode=%o" },
{ Opt_err, NULL },
{ Opt_uid, "uid=%d" },
{ Opt_gid, "gid=%d" },
{ Opt_mode, "mode=%o" },
{ Opt_debug, "debug" },
{ Opt_err, NULL },
};
static int
spufs_parse_options(char *options, struct inode *root)
spufs_parse_options(struct super_block *sb, char *options, struct inode *root)
{
char *p;
substring_t args[MAX_OPT_ARGS];
@ -679,6 +696,9 @@ spufs_parse_options(char *options, struct inode *root)
return 0;
root->i_mode = option | S_IFDIR;
break;
case Opt_debug:
spufs_get_sb_info(sb)->debug = 1;
break;
default:
return 0;
}
@ -737,7 +757,7 @@ spufs_create_root(struct super_block *sb, void *data)
SPUFS_I(inode)->i_ctx = NULL;
ret = -EINVAL;
if (!spufs_parse_options(data, inode))
if (!spufs_parse_options(sb, data, inode))
goto out_iput;
ret = -ENOMEM;
@ -755,6 +775,7 @@ spufs_create_root(struct super_block *sb, void *data)
static int
spufs_fill_super(struct super_block *sb, void *data, int silent)
{
struct spufs_sb_info *info;
static struct super_operations s_ops = {
.alloc_inode = spufs_alloc_inode,
.destroy_inode = spufs_destroy_inode,
@ -766,11 +787,16 @@ spufs_fill_super(struct super_block *sb, void *data, int silent)
save_mount_options(sb, data);
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_blocksize = PAGE_CACHE_SIZE;
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
sb->s_magic = SPUFS_MAGIC;
sb->s_op = &s_ops;
sb->s_fs_info = info;
return spufs_create_root(sb, data);
}

1
arch/powerpc/platforms/cell/spufs/spufs.h
View file

@ -244,6 +244,7 @@ struct spufs_tree_descr {
extern struct spufs_tree_descr spufs_dir_contents[];
extern struct spufs_tree_descr spufs_dir_nosched_contents[];
extern struct spufs_tree_descr spufs_dir_debug_contents[];
/* system call implementation */
extern struct spufs_calls spufs_calls;