From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- drivers/oprofile/oprofilefs.c | 299 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 299 insertions(+) create mode 100644 drivers/oprofile/oprofilefs.c (limited to 'drivers/oprofile/oprofilefs.c') diff --git a/drivers/oprofile/oprofilefs.c b/drivers/oprofile/oprofilefs.c new file mode 100644 index 000000000000..d6bae699749a --- /dev/null +++ b/drivers/oprofile/oprofilefs.c @@ -0,0 +1,299 @@ +/** + * @file oprofilefs.c + * + * @remark Copyright 2002 OProfile authors + * @remark Read the file COPYING + * + * @author John Levon + * + * A simple filesystem for configuration and + * access of oprofile. + */ + +#include +#include +#include +#include +#include +#include + +#include "oprof.h" + +#define OPROFILEFS_MAGIC 0x6f70726f + +DEFINE_SPINLOCK(oprofilefs_lock); + +static struct inode * oprofilefs_get_inode(struct super_block * sb, int mode) +{ + struct inode * inode = new_inode(sb); + + if (inode) { + inode->i_mode = mode; + inode->i_uid = 0; + inode->i_gid = 0; + inode->i_blksize = PAGE_CACHE_SIZE; + inode->i_blocks = 0; + inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; + } + return inode; +} + + +static struct super_operations s_ops = { + .statfs = simple_statfs, + .drop_inode = generic_delete_inode, +}; + + +ssize_t oprofilefs_str_to_user(char const * str, char __user * buf, size_t count, loff_t * offset) +{ + return simple_read_from_buffer(buf, count, offset, str, strlen(str)); +} + + +#define TMPBUFSIZE 50 + +ssize_t oprofilefs_ulong_to_user(unsigned long val, char __user * buf, size_t count, loff_t * offset) +{ + char tmpbuf[TMPBUFSIZE]; + size_t maxlen = snprintf(tmpbuf, TMPBUFSIZE, "%lu\n", val); + if (maxlen > TMPBUFSIZE) + maxlen = TMPBUFSIZE; + return simple_read_from_buffer(buf, count, offset, tmpbuf, maxlen); +} + + +int oprofilefs_ulong_from_user(unsigned long * val, char const __user * buf, size_t count) +{ + char tmpbuf[TMPBUFSIZE]; + + if (!count) + return 0; + + if (count > TMPBUFSIZE - 1) + return -EINVAL; + + memset(tmpbuf, 0x0, TMPBUFSIZE); + + if (copy_from_user(tmpbuf, buf, count)) + return -EFAULT; + + spin_lock(&oprofilefs_lock); + *val = simple_strtoul(tmpbuf, NULL, 0); + spin_unlock(&oprofilefs_lock); + return 0; +} + + +static ssize_t ulong_read_file(struct file * file, char __user * buf, size_t count, loff_t * offset) +{ + unsigned long * val = file->private_data; + return oprofilefs_ulong_to_user(*val, buf, count, offset); +} + + +static ssize_t ulong_write_file(struct file * file, char const __user * buf, size_t count, loff_t * offset) +{ + unsigned long * value = file->private_data; + int retval; + + if (*offset) + return -EINVAL; + + retval = oprofilefs_ulong_from_user(value, buf, count); + + if (retval) + return retval; + return count; +} + + +static int default_open(struct inode * inode, struct file * filp) +{ + if (inode->u.generic_ip) + filp->private_data = inode->u.generic_ip; + return 0; +} + + +static struct file_operations ulong_fops = { + .read = ulong_read_file, + .write = ulong_write_file, + .open = default_open, +}; + + +static struct file_operations ulong_ro_fops = { + .read = ulong_read_file, + .open = default_open, +}; + + +static struct dentry * __oprofilefs_create_file(struct super_block * sb, + struct dentry * root, char const * name, struct file_operations * fops, + int perm) +{ + struct dentry * dentry; + struct inode * inode; + + dentry = d_alloc_name(root, name); + if (!dentry) + return NULL; + inode = oprofilefs_get_inode(sb, S_IFREG | perm); + if (!inode) { + dput(dentry); + return NULL; + } + inode->i_fop = fops; + d_add(dentry, inode); + return dentry; +} + + +int oprofilefs_create_ulong(struct super_block * sb, struct dentry * root, + char const * name, unsigned long * val) +{ + struct dentry * d = __oprofilefs_create_file(sb, root, name, + &ulong_fops, 0644); + if (!d) + return -EFAULT; + + d->d_inode->u.generic_ip = val; + return 0; +} + + +int oprofilefs_create_ro_ulong(struct super_block * sb, struct dentry * root, + char const * name, unsigned long * val) +{ + struct dentry * d = __oprofilefs_create_file(sb, root, name, + &ulong_ro_fops, 0444); + if (!d) + return -EFAULT; + + d->d_inode->u.generic_ip = val; + return 0; +} + + +static ssize_t atomic_read_file(struct file * file, char __user * buf, size_t count, loff_t * offset) +{ + atomic_t * val = file->private_data; + return oprofilefs_ulong_to_user(atomic_read(val), buf, count, offset); +} + + +static struct file_operations atomic_ro_fops = { + .read = atomic_read_file, + .open = default_open, +}; + + +int oprofilefs_create_ro_atomic(struct super_block * sb, struct dentry * root, + char const * name, atomic_t * val) +{ + struct dentry * d = __oprofilefs_create_file(sb, root, name, + &atomic_ro_fops, 0444); + if (!d) + return -EFAULT; + + d->d_inode->u.generic_ip = val; + return 0; +} + + +int oprofilefs_create_file(struct super_block * sb, struct dentry * root, + char const * name, struct file_operations * fops) +{ + if (!__oprofilefs_create_file(sb, root, name, fops, 0644)) + return -EFAULT; + return 0; +} + + +int oprofilefs_create_file_perm(struct super_block * sb, struct dentry * root, + char const * name, struct file_operations * fops, int perm) +{ + if (!__oprofilefs_create_file(sb, root, name, fops, perm)) + return -EFAULT; + return 0; +} + + +struct dentry * oprofilefs_mkdir(struct super_block * sb, + struct dentry * root, char const * name) +{ + struct dentry * dentry; + struct inode * inode; + + dentry = d_alloc_name(root, name); + if (!dentry) + return NULL; + inode = oprofilefs_get_inode(sb, S_IFDIR | 0755); + if (!inode) { + dput(dentry); + return NULL; + } + inode->i_op = &simple_dir_inode_operations; + inode->i_fop = &simple_dir_operations; + d_add(dentry, inode); + return dentry; +} + + +static int oprofilefs_fill_super(struct super_block * sb, void * data, int silent) +{ + struct inode * root_inode; + struct dentry * root_dentry; + + sb->s_blocksize = PAGE_CACHE_SIZE; + sb->s_blocksize_bits = PAGE_CACHE_SHIFT; + sb->s_magic = OPROFILEFS_MAGIC; + sb->s_op = &s_ops; + sb->s_time_gran = 1; + + root_inode = oprofilefs_get_inode(sb, S_IFDIR | 0755); + if (!root_inode) + return -ENOMEM; + root_inode->i_op = &simple_dir_inode_operations; + root_inode->i_fop = &simple_dir_operations; + root_dentry = d_alloc_root(root_inode); + if (!root_dentry) { + iput(root_inode); + return -ENOMEM; + } + + sb->s_root = root_dentry; + + oprofile_create_files(sb, root_dentry); + + // FIXME: verify kill_litter_super removes our dentries + return 0; +} + + +static struct super_block *oprofilefs_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return get_sb_single(fs_type, flags, data, oprofilefs_fill_super); +} + + +static struct file_system_type oprofilefs_type = { + .owner = THIS_MODULE, + .name = "oprofilefs", + .get_sb = oprofilefs_get_sb, + .kill_sb = kill_litter_super, +}; + + +int __init oprofilefs_register(void) +{ + return register_filesystem(&oprofilefs_type); +} + + +void __exit oprofilefs_unregister(void) +{ + unregister_filesystem(&oprofilefs_type); +} -- cgit v1.2.3