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1221 lines
38 KiB
1221 lines
38 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* file.c - part of debugfs, a tiny little debug file system |
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* |
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* Copyright (C) 2004 Greg Kroah-Hartman <[email protected]> |
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* Copyright (C) 2004 IBM Inc. |
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* |
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* debugfs is for people to use instead of /proc or /sys. |
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* See Documentation/filesystems/ for more details. |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/fs.h> |
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#include <linux/seq_file.h> |
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#include <linux/pagemap.h> |
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#include <linux/debugfs.h> |
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#include <linux/io.h> |
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#include <linux/slab.h> |
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#include <linux/atomic.h> |
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#include <linux/device.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/poll.h> |
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#include <linux/security.h> |
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|
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#include "internal.h" |
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|
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struct poll_table_struct; |
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|
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static ssize_t default_read_file(struct file *file, char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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return 0; |
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} |
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|
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static ssize_t default_write_file(struct file *file, const char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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return count; |
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} |
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|
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const struct file_operations debugfs_noop_file_operations = { |
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.read = default_read_file, |
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.write = default_write_file, |
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.open = simple_open, |
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.llseek = noop_llseek, |
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}; |
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|
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#define F_DENTRY(filp) ((filp)->f_path.dentry) |
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|
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const struct file_operations *debugfs_real_fops(const struct file *filp) |
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{ |
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struct debugfs_fsdata *fsd = F_DENTRY(filp)->d_fsdata; |
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|
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if ((unsigned long)fsd & DEBUGFS_FSDATA_IS_REAL_FOPS_BIT) { |
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/* |
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* Urgh, we've been called w/o a protecting |
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* debugfs_file_get(). |
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*/ |
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WARN_ON(1); |
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return NULL; |
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} |
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|
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return fsd->real_fops; |
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} |
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EXPORT_SYMBOL_GPL(debugfs_real_fops); |
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|
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/** |
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* debugfs_file_get - mark the beginning of file data access |
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* @dentry: the dentry object whose data is being accessed. |
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* |
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* Up to a matching call to debugfs_file_put(), any successive call |
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* into the file removing functions debugfs_remove() and |
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* debugfs_remove_recursive() will block. Since associated private |
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* file data may only get freed after a successful return of any of |
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* the removal functions, you may safely access it after a successful |
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* call to debugfs_file_get() without worrying about lifetime issues. |
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* |
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* If -%EIO is returned, the file has already been removed and thus, |
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* it is not safe to access any of its data. If, on the other hand, |
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* it is allowed to access the file data, zero is returned. |
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*/ |
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int debugfs_file_get(struct dentry *dentry) |
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{ |
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struct debugfs_fsdata *fsd; |
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void *d_fsd; |
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|
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d_fsd = READ_ONCE(dentry->d_fsdata); |
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if (!((unsigned long)d_fsd & DEBUGFS_FSDATA_IS_REAL_FOPS_BIT)) { |
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fsd = d_fsd; |
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} else { |
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fsd = kmalloc(sizeof(*fsd), GFP_KERNEL); |
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if (!fsd) |
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return -ENOMEM; |
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|
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fsd->real_fops = (void *)((unsigned long)d_fsd & |
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~DEBUGFS_FSDATA_IS_REAL_FOPS_BIT); |
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refcount_set(&fsd->active_users, 1); |
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init_completion(&fsd->active_users_drained); |
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if (cmpxchg(&dentry->d_fsdata, d_fsd, fsd) != d_fsd) { |
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kfree(fsd); |
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fsd = READ_ONCE(dentry->d_fsdata); |
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} |
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} |
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|
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/* |
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* In case of a successful cmpxchg() above, this check is |
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* strictly necessary and must follow it, see the comment in |
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* __debugfs_remove_file(). |
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* OTOH, if the cmpxchg() hasn't been executed or wasn't |
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* successful, this serves the purpose of not starving |
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* removers. |
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*/ |
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if (d_unlinked(dentry)) |
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return -EIO; |
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|
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if (!refcount_inc_not_zero(&fsd->active_users)) |
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return -EIO; |
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|
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(debugfs_file_get); |
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|
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/** |
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* debugfs_file_put - mark the end of file data access |
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* @dentry: the dentry object formerly passed to |
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* debugfs_file_get(). |
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* |
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* Allow any ongoing concurrent call into debugfs_remove() or |
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* debugfs_remove_recursive() blocked by a former call to |
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* debugfs_file_get() to proceed and return to its caller. |
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*/ |
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void debugfs_file_put(struct dentry *dentry) |
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{ |
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struct debugfs_fsdata *fsd = READ_ONCE(dentry->d_fsdata); |
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|
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if (refcount_dec_and_test(&fsd->active_users)) |
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complete(&fsd->active_users_drained); |
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} |
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EXPORT_SYMBOL_GPL(debugfs_file_put); |
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|
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/* |
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* Only permit access to world-readable files when the kernel is locked down. |
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* We also need to exclude any file that has ways to write or alter it as root |
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* can bypass the permissions check. |
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*/ |
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static int debugfs_locked_down(struct inode *inode, |
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struct file *filp, |
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const struct file_operations *real_fops) |
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{ |
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if ((inode->i_mode & 07777) == 0444 && |
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!(filp->f_mode & FMODE_WRITE) && |
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!real_fops->unlocked_ioctl && |
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!real_fops->compat_ioctl && |
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!real_fops->mmap) |
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return 0; |
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|
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if (security_locked_down(LOCKDOWN_DEBUGFS)) |
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return -EPERM; |
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|
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return 0; |
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} |
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|
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static int open_proxy_open(struct inode *inode, struct file *filp) |
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{ |
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struct dentry *dentry = F_DENTRY(filp); |
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const struct file_operations *real_fops = NULL; |
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int r; |
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|
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r = debugfs_file_get(dentry); |
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if (r) |
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return r == -EIO ? -ENOENT : r; |
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|
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real_fops = debugfs_real_fops(filp); |
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|
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r = debugfs_locked_down(inode, filp, real_fops); |
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if (r) |
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goto out; |
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|
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if (!fops_get(real_fops)) { |
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#ifdef CONFIG_MODULES |
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if (real_fops->owner && |
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real_fops->owner->state == MODULE_STATE_GOING) |
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goto out; |
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#endif |
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|
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/* Huh? Module did not clean up after itself at exit? */ |
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WARN(1, "debugfs file owner did not clean up at exit: %pd", |
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dentry); |
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r = -ENXIO; |
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goto out; |
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} |
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replace_fops(filp, real_fops); |
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|
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if (real_fops->open) |
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r = real_fops->open(inode, filp); |
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|
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out: |
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debugfs_file_put(dentry); |
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return r; |
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} |
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|
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const struct file_operations debugfs_open_proxy_file_operations = { |
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.open = open_proxy_open, |
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}; |
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|
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#define PROTO(args...) args |
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#define ARGS(args...) args |
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|
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#define FULL_PROXY_FUNC(name, ret_type, filp, proto, args) \ |
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static ret_type full_proxy_ ## name(proto) \ |
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{ \ |
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struct dentry *dentry = F_DENTRY(filp); \ |
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const struct file_operations *real_fops; \ |
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ret_type r; \ |
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\ |
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r = debugfs_file_get(dentry); \ |
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if (unlikely(r)) \ |
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return r; \ |
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real_fops = debugfs_real_fops(filp); \ |
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r = real_fops->name(args); \ |
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debugfs_file_put(dentry); \ |
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return r; \ |
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} |
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FULL_PROXY_FUNC(llseek, loff_t, filp, |
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PROTO(struct file *filp, loff_t offset, int whence), |
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ARGS(filp, offset, whence)); |
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|
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FULL_PROXY_FUNC(read, ssize_t, filp, |
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PROTO(struct file *filp, char __user *buf, size_t size, |
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loff_t *ppos), |
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ARGS(filp, buf, size, ppos)); |
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|
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FULL_PROXY_FUNC(write, ssize_t, filp, |
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PROTO(struct file *filp, const char __user *buf, size_t size, |
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loff_t *ppos), |
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ARGS(filp, buf, size, ppos)); |
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|
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FULL_PROXY_FUNC(unlocked_ioctl, long, filp, |
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PROTO(struct file *filp, unsigned int cmd, unsigned long arg), |
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ARGS(filp, cmd, arg)); |
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|
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static __poll_t full_proxy_poll(struct file *filp, |
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struct poll_table_struct *wait) |
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{ |
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struct dentry *dentry = F_DENTRY(filp); |
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__poll_t r = 0; |
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const struct file_operations *real_fops; |
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|
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if (debugfs_file_get(dentry)) |
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return EPOLLHUP; |
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real_fops = debugfs_real_fops(filp); |
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r = real_fops->poll(filp, wait); |
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debugfs_file_put(dentry); |
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return r; |
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} |
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static int full_proxy_release(struct inode *inode, struct file *filp) |
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{ |
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const struct dentry *dentry = F_DENTRY(filp); |
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const struct file_operations *real_fops = debugfs_real_fops(filp); |
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const struct file_operations *proxy_fops = filp->f_op; |
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int r = 0; |
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|
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/* |
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* We must not protect this against removal races here: the |
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* original releaser should be called unconditionally in order |
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* not to leak any resources. Releasers must not assume that |
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* ->i_private is still being meaningful here. |
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*/ |
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if (real_fops->release) |
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r = real_fops->release(inode, filp); |
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|
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replace_fops(filp, d_inode(dentry)->i_fop); |
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kfree(proxy_fops); |
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fops_put(real_fops); |
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return r; |
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} |
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|
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static void __full_proxy_fops_init(struct file_operations *proxy_fops, |
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const struct file_operations *real_fops) |
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{ |
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proxy_fops->release = full_proxy_release; |
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if (real_fops->llseek) |
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proxy_fops->llseek = full_proxy_llseek; |
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if (real_fops->read) |
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proxy_fops->read = full_proxy_read; |
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if (real_fops->write) |
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proxy_fops->write = full_proxy_write; |
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if (real_fops->poll) |
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proxy_fops->poll = full_proxy_poll; |
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if (real_fops->unlocked_ioctl) |
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proxy_fops->unlocked_ioctl = full_proxy_unlocked_ioctl; |
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} |
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|
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static int full_proxy_open(struct inode *inode, struct file *filp) |
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{ |
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struct dentry *dentry = F_DENTRY(filp); |
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const struct file_operations *real_fops = NULL; |
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struct file_operations *proxy_fops = NULL; |
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int r; |
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r = debugfs_file_get(dentry); |
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if (r) |
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return r == -EIO ? -ENOENT : r; |
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real_fops = debugfs_real_fops(filp); |
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r = debugfs_locked_down(inode, filp, real_fops); |
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if (r) |
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goto out; |
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if (!fops_get(real_fops)) { |
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#ifdef CONFIG_MODULES |
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if (real_fops->owner && |
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real_fops->owner->state == MODULE_STATE_GOING) |
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goto out; |
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#endif |
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|
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/* Huh? Module did not cleanup after itself at exit? */ |
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WARN(1, "debugfs file owner did not clean up at exit: %pd", |
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dentry); |
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r = -ENXIO; |
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goto out; |
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} |
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|
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proxy_fops = kzalloc(sizeof(*proxy_fops), GFP_KERNEL); |
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if (!proxy_fops) { |
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r = -ENOMEM; |
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goto free_proxy; |
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} |
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__full_proxy_fops_init(proxy_fops, real_fops); |
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replace_fops(filp, proxy_fops); |
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|
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if (real_fops->open) { |
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r = real_fops->open(inode, filp); |
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if (r) { |
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replace_fops(filp, d_inode(dentry)->i_fop); |
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goto free_proxy; |
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} else if (filp->f_op != proxy_fops) { |
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/* No protection against file removal anymore. */ |
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WARN(1, "debugfs file owner replaced proxy fops: %pd", |
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dentry); |
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goto free_proxy; |
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} |
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} |
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|
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goto out; |
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free_proxy: |
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kfree(proxy_fops); |
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fops_put(real_fops); |
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out: |
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debugfs_file_put(dentry); |
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return r; |
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} |
|
|
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const struct file_operations debugfs_full_proxy_file_operations = { |
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.open = full_proxy_open, |
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}; |
|
|
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ssize_t debugfs_attr_read(struct file *file, char __user *buf, |
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size_t len, loff_t *ppos) |
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{ |
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struct dentry *dentry = F_DENTRY(file); |
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ssize_t ret; |
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|
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ret = debugfs_file_get(dentry); |
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if (unlikely(ret)) |
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return ret; |
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ret = simple_attr_read(file, buf, len, ppos); |
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debugfs_file_put(dentry); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(debugfs_attr_read); |
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|
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ssize_t debugfs_attr_write(struct file *file, const char __user *buf, |
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size_t len, loff_t *ppos) |
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{ |
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struct dentry *dentry = F_DENTRY(file); |
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ssize_t ret; |
|
|
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ret = debugfs_file_get(dentry); |
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if (unlikely(ret)) |
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return ret; |
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ret = simple_attr_write(file, buf, len, ppos); |
|
debugfs_file_put(dentry); |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(debugfs_attr_write); |
|
|
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static struct dentry *debugfs_create_mode_unsafe(const char *name, umode_t mode, |
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struct dentry *parent, void *value, |
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const struct file_operations *fops, |
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const struct file_operations *fops_ro, |
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const struct file_operations *fops_wo) |
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{ |
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/* if there are no write bits set, make read only */ |
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if (!(mode & S_IWUGO)) |
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return debugfs_create_file_unsafe(name, mode, parent, value, |
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fops_ro); |
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/* if there are no read bits set, make write only */ |
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if (!(mode & S_IRUGO)) |
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return debugfs_create_file_unsafe(name, mode, parent, value, |
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fops_wo); |
|
|
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return debugfs_create_file_unsafe(name, mode, parent, value, fops); |
|
} |
|
|
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static int debugfs_u8_set(void *data, u64 val) |
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{ |
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*(u8 *)data = val; |
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return 0; |
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} |
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static int debugfs_u8_get(void *data, u64 *val) |
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{ |
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*val = *(u8 *)data; |
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return 0; |
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} |
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DEFINE_DEBUGFS_ATTRIBUTE(fops_u8, debugfs_u8_get, debugfs_u8_set, "%llu\n"); |
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DEFINE_DEBUGFS_ATTRIBUTE(fops_u8_ro, debugfs_u8_get, NULL, "%llu\n"); |
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DEFINE_DEBUGFS_ATTRIBUTE(fops_u8_wo, NULL, debugfs_u8_set, "%llu\n"); |
|
|
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/** |
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* debugfs_create_u8 - create a debugfs file that is used to read and write an unsigned 8-bit value |
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* @name: a pointer to a string containing the name of the file to create. |
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* @mode: the permission that the file should have |
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* @parent: a pointer to the parent dentry for this file. This should be a |
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* directory dentry if set. If this parameter is %NULL, then the |
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* file will be created in the root of the debugfs filesystem. |
|
* @value: a pointer to the variable that the file should read to and write |
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* from. |
|
* |
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* This function creates a file in debugfs with the given name that |
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* contains the value of the variable @value. If the @mode variable is so |
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* set, it can be read from, and written to. |
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*/ |
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void debugfs_create_u8(const char *name, umode_t mode, struct dentry *parent, |
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u8 *value) |
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{ |
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debugfs_create_mode_unsafe(name, mode, parent, value, &fops_u8, |
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&fops_u8_ro, &fops_u8_wo); |
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} |
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EXPORT_SYMBOL_GPL(debugfs_create_u8); |
|
|
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static int debugfs_u16_set(void *data, u64 val) |
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{ |
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*(u16 *)data = val; |
|
return 0; |
|
} |
|
static int debugfs_u16_get(void *data, u64 *val) |
|
{ |
|
*val = *(u16 *)data; |
|
return 0; |
|
} |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u16, debugfs_u16_get, debugfs_u16_set, "%llu\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u16_ro, debugfs_u16_get, NULL, "%llu\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u16_wo, NULL, debugfs_u16_set, "%llu\n"); |
|
|
|
/** |
|
* debugfs_create_u16 - create a debugfs file that is used to read and write an unsigned 16-bit value |
|
* @name: a pointer to a string containing the name of the file to create. |
|
* @mode: the permission that the file should have |
|
* @parent: a pointer to the parent dentry for this file. This should be a |
|
* directory dentry if set. If this parameter is %NULL, then the |
|
* file will be created in the root of the debugfs filesystem. |
|
* @value: a pointer to the variable that the file should read to and write |
|
* from. |
|
* |
|
* This function creates a file in debugfs with the given name that |
|
* contains the value of the variable @value. If the @mode variable is so |
|
* set, it can be read from, and written to. |
|
*/ |
|
void debugfs_create_u16(const char *name, umode_t mode, struct dentry *parent, |
|
u16 *value) |
|
{ |
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_u16, |
|
&fops_u16_ro, &fops_u16_wo); |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_create_u16); |
|
|
|
static int debugfs_u32_set(void *data, u64 val) |
|
{ |
|
*(u32 *)data = val; |
|
return 0; |
|
} |
|
static int debugfs_u32_get(void *data, u64 *val) |
|
{ |
|
*val = *(u32 *)data; |
|
return 0; |
|
} |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u32, debugfs_u32_get, debugfs_u32_set, "%llu\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u32_ro, debugfs_u32_get, NULL, "%llu\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u32_wo, NULL, debugfs_u32_set, "%llu\n"); |
|
|
|
/** |
|
* debugfs_create_u32 - create a debugfs file that is used to read and write an unsigned 32-bit value |
|
* @name: a pointer to a string containing the name of the file to create. |
|
* @mode: the permission that the file should have |
|
* @parent: a pointer to the parent dentry for this file. This should be a |
|
* directory dentry if set. If this parameter is %NULL, then the |
|
* file will be created in the root of the debugfs filesystem. |
|
* @value: a pointer to the variable that the file should read to and write |
|
* from. |
|
* |
|
* This function creates a file in debugfs with the given name that |
|
* contains the value of the variable @value. If the @mode variable is so |
|
* set, it can be read from, and written to. |
|
*/ |
|
void debugfs_create_u32(const char *name, umode_t mode, struct dentry *parent, |
|
u32 *value) |
|
{ |
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_u32, |
|
&fops_u32_ro, &fops_u32_wo); |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_create_u32); |
|
|
|
static int debugfs_u64_set(void *data, u64 val) |
|
{ |
|
*(u64 *)data = val; |
|
return 0; |
|
} |
|
|
|
static int debugfs_u64_get(void *data, u64 *val) |
|
{ |
|
*val = *(u64 *)data; |
|
return 0; |
|
} |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u64, debugfs_u64_get, debugfs_u64_set, "%llu\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u64_ro, debugfs_u64_get, NULL, "%llu\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_u64_wo, NULL, debugfs_u64_set, "%llu\n"); |
|
|
|
/** |
|
* debugfs_create_u64 - create a debugfs file that is used to read and write an unsigned 64-bit value |
|
* @name: a pointer to a string containing the name of the file to create. |
|
* @mode: the permission that the file should have |
|
* @parent: a pointer to the parent dentry for this file. This should be a |
|
* directory dentry if set. If this parameter is %NULL, then the |
|
* file will be created in the root of the debugfs filesystem. |
|
* @value: a pointer to the variable that the file should read to and write |
|
* from. |
|
* |
|
* This function creates a file in debugfs with the given name that |
|
* contains the value of the variable @value. If the @mode variable is so |
|
* set, it can be read from, and written to. |
|
*/ |
|
void debugfs_create_u64(const char *name, umode_t mode, struct dentry *parent, |
|
u64 *value) |
|
{ |
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_u64, |
|
&fops_u64_ro, &fops_u64_wo); |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_create_u64); |
|
|
|
static int debugfs_ulong_set(void *data, u64 val) |
|
{ |
|
*(unsigned long *)data = val; |
|
return 0; |
|
} |
|
|
|
static int debugfs_ulong_get(void *data, u64 *val) |
|
{ |
|
*val = *(unsigned long *)data; |
|
return 0; |
|
} |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_ulong, debugfs_ulong_get, debugfs_ulong_set, |
|
"%llu\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_ulong_ro, debugfs_ulong_get, NULL, "%llu\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_ulong_wo, NULL, debugfs_ulong_set, "%llu\n"); |
|
|
|
/** |
|
* debugfs_create_ulong - create a debugfs file that is used to read and write |
|
* an unsigned long value. |
|
* @name: a pointer to a string containing the name of the file to create. |
|
* @mode: the permission that the file should have |
|
* @parent: a pointer to the parent dentry for this file. This should be a |
|
* directory dentry if set. If this parameter is %NULL, then the |
|
* file will be created in the root of the debugfs filesystem. |
|
* @value: a pointer to the variable that the file should read to and write |
|
* from. |
|
* |
|
* This function creates a file in debugfs with the given name that |
|
* contains the value of the variable @value. If the @mode variable is so |
|
* set, it can be read from, and written to. |
|
*/ |
|
void debugfs_create_ulong(const char *name, umode_t mode, struct dentry *parent, |
|
unsigned long *value) |
|
{ |
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_ulong, |
|
&fops_ulong_ro, &fops_ulong_wo); |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_create_ulong); |
|
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x8, debugfs_u8_get, debugfs_u8_set, "0x%02llx\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x8_ro, debugfs_u8_get, NULL, "0x%02llx\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x8_wo, NULL, debugfs_u8_set, "0x%02llx\n"); |
|
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x16, debugfs_u16_get, debugfs_u16_set, |
|
"0x%04llx\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x16_ro, debugfs_u16_get, NULL, "0x%04llx\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x16_wo, NULL, debugfs_u16_set, "0x%04llx\n"); |
|
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x32, debugfs_u32_get, debugfs_u32_set, |
|
"0x%08llx\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x32_ro, debugfs_u32_get, NULL, "0x%08llx\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x32_wo, NULL, debugfs_u32_set, "0x%08llx\n"); |
|
|
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x64, debugfs_u64_get, debugfs_u64_set, |
|
"0x%016llx\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x64_ro, debugfs_u64_get, NULL, "0x%016llx\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_x64_wo, NULL, debugfs_u64_set, "0x%016llx\n"); |
|
|
|
/* |
|
* debugfs_create_x{8,16,32,64} - create a debugfs file that is used to read and write an unsigned {8,16,32,64}-bit value |
|
* |
|
* These functions are exactly the same as the above functions (but use a hex |
|
* output for the decimal challenged). For details look at the above unsigned |
|
* decimal functions. |
|
*/ |
|
|
|
/** |
|
* debugfs_create_x8 - create a debugfs file that is used to read and write an unsigned 8-bit value |
|
* @name: a pointer to a string containing the name of the file to create. |
|
* @mode: the permission that the file should have |
|
* @parent: a pointer to the parent dentry for this file. This should be a |
|
* directory dentry if set. If this parameter is %NULL, then the |
|
* file will be created in the root of the debugfs filesystem. |
|
* @value: a pointer to the variable that the file should read to and write |
|
* from. |
|
*/ |
|
void debugfs_create_x8(const char *name, umode_t mode, struct dentry *parent, |
|
u8 *value) |
|
{ |
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x8, |
|
&fops_x8_ro, &fops_x8_wo); |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_create_x8); |
|
|
|
/** |
|
* debugfs_create_x16 - create a debugfs file that is used to read and write an unsigned 16-bit value |
|
* @name: a pointer to a string containing the name of the file to create. |
|
* @mode: the permission that the file should have |
|
* @parent: a pointer to the parent dentry for this file. This should be a |
|
* directory dentry if set. If this parameter is %NULL, then the |
|
* file will be created in the root of the debugfs filesystem. |
|
* @value: a pointer to the variable that the file should read to and write |
|
* from. |
|
*/ |
|
void debugfs_create_x16(const char *name, umode_t mode, struct dentry *parent, |
|
u16 *value) |
|
{ |
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x16, |
|
&fops_x16_ro, &fops_x16_wo); |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_create_x16); |
|
|
|
/** |
|
* debugfs_create_x32 - create a debugfs file that is used to read and write an unsigned 32-bit value |
|
* @name: a pointer to a string containing the name of the file to create. |
|
* @mode: the permission that the file should have |
|
* @parent: a pointer to the parent dentry for this file. This should be a |
|
* directory dentry if set. If this parameter is %NULL, then the |
|
* file will be created in the root of the debugfs filesystem. |
|
* @value: a pointer to the variable that the file should read to and write |
|
* from. |
|
*/ |
|
void debugfs_create_x32(const char *name, umode_t mode, struct dentry *parent, |
|
u32 *value) |
|
{ |
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x32, |
|
&fops_x32_ro, &fops_x32_wo); |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_create_x32); |
|
|
|
/** |
|
* debugfs_create_x64 - create a debugfs file that is used to read and write an unsigned 64-bit value |
|
* @name: a pointer to a string containing the name of the file to create. |
|
* @mode: the permission that the file should have |
|
* @parent: a pointer to the parent dentry for this file. This should be a |
|
* directory dentry if set. If this parameter is %NULL, then the |
|
* file will be created in the root of the debugfs filesystem. |
|
* @value: a pointer to the variable that the file should read to and write |
|
* from. |
|
*/ |
|
void debugfs_create_x64(const char *name, umode_t mode, struct dentry *parent, |
|
u64 *value) |
|
{ |
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_x64, |
|
&fops_x64_ro, &fops_x64_wo); |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_create_x64); |
|
|
|
|
|
static int debugfs_size_t_set(void *data, u64 val) |
|
{ |
|
*(size_t *)data = val; |
|
return 0; |
|
} |
|
static int debugfs_size_t_get(void *data, u64 *val) |
|
{ |
|
*val = *(size_t *)data; |
|
return 0; |
|
} |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_size_t, debugfs_size_t_get, debugfs_size_t_set, |
|
"%llu\n"); /* %llu and %zu are more or less the same */ |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_size_t_ro, debugfs_size_t_get, NULL, "%llu\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_size_t_wo, NULL, debugfs_size_t_set, "%llu\n"); |
|
|
|
/** |
|
* debugfs_create_size_t - create a debugfs file that is used to read and write an size_t value |
|
* @name: a pointer to a string containing the name of the file to create. |
|
* @mode: the permission that the file should have |
|
* @parent: a pointer to the parent dentry for this file. This should be a |
|
* directory dentry if set. If this parameter is %NULL, then the |
|
* file will be created in the root of the debugfs filesystem. |
|
* @value: a pointer to the variable that the file should read to and write |
|
* from. |
|
*/ |
|
void debugfs_create_size_t(const char *name, umode_t mode, |
|
struct dentry *parent, size_t *value) |
|
{ |
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_size_t, |
|
&fops_size_t_ro, &fops_size_t_wo); |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_create_size_t); |
|
|
|
static int debugfs_atomic_t_set(void *data, u64 val) |
|
{ |
|
atomic_set((atomic_t *)data, val); |
|
return 0; |
|
} |
|
static int debugfs_atomic_t_get(void *data, u64 *val) |
|
{ |
|
*val = atomic_read((atomic_t *)data); |
|
return 0; |
|
} |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t, debugfs_atomic_t_get, |
|
debugfs_atomic_t_set, "%lld\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t_ro, debugfs_atomic_t_get, NULL, |
|
"%lld\n"); |
|
DEFINE_DEBUGFS_ATTRIBUTE(fops_atomic_t_wo, NULL, debugfs_atomic_t_set, |
|
"%lld\n"); |
|
|
|
/** |
|
* debugfs_create_atomic_t - create a debugfs file that is used to read and |
|
* write an atomic_t value |
|
* @name: a pointer to a string containing the name of the file to create. |
|
* @mode: the permission that the file should have |
|
* @parent: a pointer to the parent dentry for this file. This should be a |
|
* directory dentry if set. If this parameter is %NULL, then the |
|
* file will be created in the root of the debugfs filesystem. |
|
* @value: a pointer to the variable that the file should read to and write |
|
* from. |
|
*/ |
|
void debugfs_create_atomic_t(const char *name, umode_t mode, |
|
struct dentry *parent, atomic_t *value) |
|
{ |
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_atomic_t, |
|
&fops_atomic_t_ro, &fops_atomic_t_wo); |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_create_atomic_t); |
|
|
|
ssize_t debugfs_read_file_bool(struct file *file, char __user *user_buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
char buf[2]; |
|
bool val; |
|
int r; |
|
struct dentry *dentry = F_DENTRY(file); |
|
|
|
r = debugfs_file_get(dentry); |
|
if (unlikely(r)) |
|
return r; |
|
val = *(bool *)file->private_data; |
|
debugfs_file_put(dentry); |
|
|
|
if (val) |
|
buf[0] = 'Y'; |
|
else |
|
buf[0] = 'N'; |
|
buf[1] = '\n'; |
|
return simple_read_from_buffer(user_buf, count, ppos, buf, 2); |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_read_file_bool); |
|
|
|
ssize_t debugfs_write_file_bool(struct file *file, const char __user *user_buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
bool bv; |
|
int r; |
|
bool *val = file->private_data; |
|
struct dentry *dentry = F_DENTRY(file); |
|
|
|
r = kstrtobool_from_user(user_buf, count, &bv); |
|
if (!r) { |
|
r = debugfs_file_get(dentry); |
|
if (unlikely(r)) |
|
return r; |
|
*val = bv; |
|
debugfs_file_put(dentry); |
|
} |
|
|
|
return count; |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_write_file_bool); |
|
|
|
static const struct file_operations fops_bool = { |
|
.read = debugfs_read_file_bool, |
|
.write = debugfs_write_file_bool, |
|
.open = simple_open, |
|
.llseek = default_llseek, |
|
}; |
|
|
|
static const struct file_operations fops_bool_ro = { |
|
.read = debugfs_read_file_bool, |
|
.open = simple_open, |
|
.llseek = default_llseek, |
|
}; |
|
|
|
static const struct file_operations fops_bool_wo = { |
|
.write = debugfs_write_file_bool, |
|
.open = simple_open, |
|
.llseek = default_llseek, |
|
}; |
|
|
|
/** |
|
* debugfs_create_bool - create a debugfs file that is used to read and write a boolean value |
|
* @name: a pointer to a string containing the name of the file to create. |
|
* @mode: the permission that the file should have |
|
* @parent: a pointer to the parent dentry for this file. This should be a |
|
* directory dentry if set. If this parameter is %NULL, then the |
|
* file will be created in the root of the debugfs filesystem. |
|
* @value: a pointer to the variable that the file should read to and write |
|
* from. |
|
* |
|
* This function creates a file in debugfs with the given name that |
|
* contains the value of the variable @value. If the @mode variable is so |
|
* set, it can be read from, and written to. |
|
*/ |
|
void debugfs_create_bool(const char *name, umode_t mode, struct dentry *parent, |
|
bool *value) |
|
{ |
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_bool, |
|
&fops_bool_ro, &fops_bool_wo); |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_create_bool); |
|
|
|
ssize_t debugfs_read_file_str(struct file *file, char __user *user_buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
struct dentry *dentry = F_DENTRY(file); |
|
char *str, *copy = NULL; |
|
int copy_len, len; |
|
ssize_t ret; |
|
|
|
ret = debugfs_file_get(dentry); |
|
if (unlikely(ret)) |
|
return ret; |
|
|
|
str = *(char **)file->private_data; |
|
len = strlen(str) + 1; |
|
copy = kmalloc(len, GFP_KERNEL); |
|
if (!copy) { |
|
debugfs_file_put(dentry); |
|
return -ENOMEM; |
|
} |
|
|
|
copy_len = strscpy(copy, str, len); |
|
debugfs_file_put(dentry); |
|
if (copy_len < 0) { |
|
kfree(copy); |
|
return copy_len; |
|
} |
|
|
|
copy[copy_len] = '\n'; |
|
|
|
ret = simple_read_from_buffer(user_buf, count, ppos, copy, len); |
|
kfree(copy); |
|
|
|
return ret; |
|
} |
|
|
|
static ssize_t debugfs_write_file_str(struct file *file, const char __user *user_buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
/* This is really only for read-only strings */ |
|
return -EINVAL; |
|
} |
|
|
|
static const struct file_operations fops_str = { |
|
.read = debugfs_read_file_str, |
|
.write = debugfs_write_file_str, |
|
.open = simple_open, |
|
.llseek = default_llseek, |
|
}; |
|
|
|
static const struct file_operations fops_str_ro = { |
|
.read = debugfs_read_file_str, |
|
.open = simple_open, |
|
.llseek = default_llseek, |
|
}; |
|
|
|
static const struct file_operations fops_str_wo = { |
|
.write = debugfs_write_file_str, |
|
.open = simple_open, |
|
.llseek = default_llseek, |
|
}; |
|
|
|
/** |
|
* debugfs_create_str - create a debugfs file that is used to read and write a string value |
|
* @name: a pointer to a string containing the name of the file to create. |
|
* @mode: the permission that the file should have |
|
* @parent: a pointer to the parent dentry for this file. This should be a |
|
* directory dentry if set. If this parameter is %NULL, then the |
|
* file will be created in the root of the debugfs filesystem. |
|
* @value: a pointer to the variable that the file should read to and write |
|
* from. |
|
* |
|
* This function creates a file in debugfs with the given name that |
|
* contains the value of the variable @value. If the @mode variable is so |
|
* set, it can be read from, and written to. |
|
* |
|
* This function will return a pointer to a dentry if it succeeds. This |
|
* pointer must be passed to the debugfs_remove() function when the file is |
|
* to be removed (no automatic cleanup happens if your module is unloaded, |
|
* you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be |
|
* returned. |
|
* |
|
* If debugfs is not enabled in the kernel, the value ERR_PTR(-ENODEV) will |
|
* be returned. |
|
*/ |
|
void debugfs_create_str(const char *name, umode_t mode, |
|
struct dentry *parent, char **value) |
|
{ |
|
debugfs_create_mode_unsafe(name, mode, parent, value, &fops_str, |
|
&fops_str_ro, &fops_str_wo); |
|
} |
|
|
|
static ssize_t read_file_blob(struct file *file, char __user *user_buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
struct debugfs_blob_wrapper *blob = file->private_data; |
|
struct dentry *dentry = F_DENTRY(file); |
|
ssize_t r; |
|
|
|
r = debugfs_file_get(dentry); |
|
if (unlikely(r)) |
|
return r; |
|
r = simple_read_from_buffer(user_buf, count, ppos, blob->data, |
|
blob->size); |
|
debugfs_file_put(dentry); |
|
return r; |
|
} |
|
|
|
static const struct file_operations fops_blob = { |
|
.read = read_file_blob, |
|
.open = simple_open, |
|
.llseek = default_llseek, |
|
}; |
|
|
|
/** |
|
* debugfs_create_blob - create a debugfs file that is used to read a binary blob |
|
* @name: a pointer to a string containing the name of the file to create. |
|
* @mode: the read permission that the file should have (other permissions are |
|
* masked out) |
|
* @parent: a pointer to the parent dentry for this file. This should be a |
|
* directory dentry if set. If this parameter is %NULL, then the |
|
* file will be created in the root of the debugfs filesystem. |
|
* @blob: a pointer to a struct debugfs_blob_wrapper which contains a pointer |
|
* to the blob data and the size of the data. |
|
* |
|
* This function creates a file in debugfs with the given name that exports |
|
* @blob->data as a binary blob. If the @mode variable is so set it can be |
|
* read from. Writing is not supported. |
|
* |
|
* This function will return a pointer to a dentry if it succeeds. This |
|
* pointer must be passed to the debugfs_remove() function when the file is |
|
* to be removed (no automatic cleanup happens if your module is unloaded, |
|
* you are responsible here.) If an error occurs, ERR_PTR(-ERROR) will be |
|
* returned. |
|
* |
|
* If debugfs is not enabled in the kernel, the value ERR_PTR(-ENODEV) will |
|
* be returned. |
|
*/ |
|
struct dentry *debugfs_create_blob(const char *name, umode_t mode, |
|
struct dentry *parent, |
|
struct debugfs_blob_wrapper *blob) |
|
{ |
|
return debugfs_create_file_unsafe(name, mode & 0444, parent, blob, &fops_blob); |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_create_blob); |
|
|
|
static size_t u32_format_array(char *buf, size_t bufsize, |
|
u32 *array, int array_size) |
|
{ |
|
size_t ret = 0; |
|
|
|
while (--array_size >= 0) { |
|
size_t len; |
|
char term = array_size ? ' ' : '\n'; |
|
|
|
len = snprintf(buf, bufsize, "%u%c", *array++, term); |
|
ret += len; |
|
|
|
buf += len; |
|
bufsize -= len; |
|
} |
|
return ret; |
|
} |
|
|
|
static int u32_array_open(struct inode *inode, struct file *file) |
|
{ |
|
struct debugfs_u32_array *data = inode->i_private; |
|
int size, elements = data->n_elements; |
|
char *buf; |
|
|
|
/* |
|
* Max size: |
|
* - 10 digits + ' '/'\n' = 11 bytes per number |
|
* - terminating NUL character |
|
*/ |
|
size = elements*11; |
|
buf = kmalloc(size+1, GFP_KERNEL); |
|
if (!buf) |
|
return -ENOMEM; |
|
buf[size] = 0; |
|
|
|
file->private_data = buf; |
|
u32_format_array(buf, size, data->array, data->n_elements); |
|
|
|
return nonseekable_open(inode, file); |
|
} |
|
|
|
static ssize_t u32_array_read(struct file *file, char __user *buf, size_t len, |
|
loff_t *ppos) |
|
{ |
|
size_t size = strlen(file->private_data); |
|
|
|
return simple_read_from_buffer(buf, len, ppos, |
|
file->private_data, size); |
|
} |
|
|
|
static int u32_array_release(struct inode *inode, struct file *file) |
|
{ |
|
kfree(file->private_data); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct file_operations u32_array_fops = { |
|
.owner = THIS_MODULE, |
|
.open = u32_array_open, |
|
.release = u32_array_release, |
|
.read = u32_array_read, |
|
.llseek = no_llseek, |
|
}; |
|
|
|
/** |
|
* debugfs_create_u32_array - create a debugfs file that is used to read u32 |
|
* array. |
|
* @name: a pointer to a string containing the name of the file to create. |
|
* @mode: the permission that the file should have. |
|
* @parent: a pointer to the parent dentry for this file. This should be a |
|
* directory dentry if set. If this parameter is %NULL, then the |
|
* file will be created in the root of the debugfs filesystem. |
|
* @array: wrapper struct containing data pointer and size of the array. |
|
* |
|
* This function creates a file in debugfs with the given name that exports |
|
* @array as data. If the @mode variable is so set it can be read from. |
|
* Writing is not supported. Seek within the file is also not supported. |
|
* Once array is created its size can not be changed. |
|
*/ |
|
void debugfs_create_u32_array(const char *name, umode_t mode, |
|
struct dentry *parent, |
|
struct debugfs_u32_array *array) |
|
{ |
|
debugfs_create_file_unsafe(name, mode, parent, array, &u32_array_fops); |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_create_u32_array); |
|
|
|
#ifdef CONFIG_HAS_IOMEM |
|
|
|
/* |
|
* The regset32 stuff is used to print 32-bit registers using the |
|
* seq_file utilities. We offer printing a register set in an already-opened |
|
* sequential file or create a debugfs file that only prints a regset32. |
|
*/ |
|
|
|
/** |
|
* debugfs_print_regs32 - use seq_print to describe a set of registers |
|
* @s: the seq_file structure being used to generate output |
|
* @regs: an array if struct debugfs_reg32 structures |
|
* @nregs: the length of the above array |
|
* @base: the base address to be used in reading the registers |
|
* @prefix: a string to be prefixed to every output line |
|
* |
|
* This function outputs a text block describing the current values of |
|
* some 32-bit hardware registers. It is meant to be used within debugfs |
|
* files based on seq_file that need to show registers, intermixed with other |
|
* information. The prefix argument may be used to specify a leading string, |
|
* because some peripherals have several blocks of identical registers, |
|
* for example configuration of dma channels |
|
*/ |
|
void debugfs_print_regs32(struct seq_file *s, const struct debugfs_reg32 *regs, |
|
int nregs, void __iomem *base, char *prefix) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < nregs; i++, regs++) { |
|
if (prefix) |
|
seq_printf(s, "%s", prefix); |
|
seq_printf(s, "%s = 0x%08x\n", regs->name, |
|
readl(base + regs->offset)); |
|
if (seq_has_overflowed(s)) |
|
break; |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_print_regs32); |
|
|
|
static int debugfs_show_regset32(struct seq_file *s, void *data) |
|
{ |
|
struct debugfs_regset32 *regset = s->private; |
|
|
|
if (regset->dev) |
|
pm_runtime_get_sync(regset->dev); |
|
|
|
debugfs_print_regs32(s, regset->regs, regset->nregs, regset->base, ""); |
|
|
|
if (regset->dev) |
|
pm_runtime_put(regset->dev); |
|
|
|
return 0; |
|
} |
|
|
|
static int debugfs_open_regset32(struct inode *inode, struct file *file) |
|
{ |
|
return single_open(file, debugfs_show_regset32, inode->i_private); |
|
} |
|
|
|
static const struct file_operations fops_regset32 = { |
|
.open = debugfs_open_regset32, |
|
.read = seq_read, |
|
.llseek = seq_lseek, |
|
.release = single_release, |
|
}; |
|
|
|
/** |
|
* debugfs_create_regset32 - create a debugfs file that returns register values |
|
* @name: a pointer to a string containing the name of the file to create. |
|
* @mode: the permission that the file should have |
|
* @parent: a pointer to the parent dentry for this file. This should be a |
|
* directory dentry if set. If this parameter is %NULL, then the |
|
* file will be created in the root of the debugfs filesystem. |
|
* @regset: a pointer to a struct debugfs_regset32, which contains a pointer |
|
* to an array of register definitions, the array size and the base |
|
* address where the register bank is to be found. |
|
* |
|
* This function creates a file in debugfs with the given name that reports |
|
* the names and values of a set of 32-bit registers. If the @mode variable |
|
* is so set it can be read from. Writing is not supported. |
|
*/ |
|
void debugfs_create_regset32(const char *name, umode_t mode, |
|
struct dentry *parent, |
|
struct debugfs_regset32 *regset) |
|
{ |
|
debugfs_create_file(name, mode, parent, regset, &fops_regset32); |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_create_regset32); |
|
|
|
#endif /* CONFIG_HAS_IOMEM */ |
|
|
|
struct debugfs_devm_entry { |
|
int (*read)(struct seq_file *seq, void *data); |
|
struct device *dev; |
|
}; |
|
|
|
static int debugfs_devm_entry_open(struct inode *inode, struct file *f) |
|
{ |
|
struct debugfs_devm_entry *entry = inode->i_private; |
|
|
|
return single_open(f, entry->read, entry->dev); |
|
} |
|
|
|
static const struct file_operations debugfs_devm_entry_ops = { |
|
.owner = THIS_MODULE, |
|
.open = debugfs_devm_entry_open, |
|
.release = single_release, |
|
.read = seq_read, |
|
.llseek = seq_lseek |
|
}; |
|
|
|
/** |
|
* debugfs_create_devm_seqfile - create a debugfs file that is bound to device. |
|
* |
|
* @dev: device related to this debugfs file. |
|
* @name: name of the debugfs file. |
|
* @parent: a pointer to the parent dentry for this file. This should be a |
|
* directory dentry if set. If this parameter is %NULL, then the |
|
* file will be created in the root of the debugfs filesystem. |
|
* @read_fn: function pointer called to print the seq_file content. |
|
*/ |
|
void debugfs_create_devm_seqfile(struct device *dev, const char *name, |
|
struct dentry *parent, |
|
int (*read_fn)(struct seq_file *s, void *data)) |
|
{ |
|
struct debugfs_devm_entry *entry; |
|
|
|
if (IS_ERR(parent)) |
|
return; |
|
|
|
entry = devm_kzalloc(dev, sizeof(*entry), GFP_KERNEL); |
|
if (!entry) |
|
return; |
|
|
|
entry->read = read_fn; |
|
entry->dev = dev; |
|
|
|
debugfs_create_file(name, S_IRUGO, parent, entry, |
|
&debugfs_devm_entry_ops); |
|
} |
|
EXPORT_SYMBOL_GPL(debugfs_create_devm_seqfile);
|
|
|