| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* |
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| 3 | * internal.h - declarations internal to debugfs |
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| 4 | * |
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| 5 | * Copyright (C) 2016 Nicolai Stange <nicstange@gmail.com> |
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| 6 | */ |
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| 7 | |
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| 8 | #ifndef _DEBUGFS_INTERNAL_H_ |
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| 9 | #define _DEBUGFS_INTERNAL_H_ |
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| 10 | |
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| 11 | struct file_operations; |
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| 12 | |
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| 13 | /* declared over in file.c */ |
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| 14 | extern const struct file_operations debugfs_noop_file_operations; |
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| 15 | extern const struct file_operations debugfs_open_proxy_file_operations; |
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| 16 | extern const struct file_operations debugfs_full_proxy_file_operations; |
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| 17 | |
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| 18 | struct debugfs_fsdata { |
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| 19 | const struct file_operations *real_fops; |
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| 20 | refcount_t active_users; |
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| 21 | struct completion active_users_drained; |
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| 22 | }; |
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| 23 | |
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| 24 | /* |
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| 25 | * A dentry's ->d_fsdata either points to the real fops or to a |
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| 26 | * dynamically allocated debugfs_fsdata instance. |
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| 27 | * In order to distinguish between these two cases, a real fops |
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| 28 | * pointer gets its lowest bit set. |
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| 29 | */ |
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| 30 | #define DEBUGFS_FSDATA_IS_REAL_FOPS_BIT BIT(0) |
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| 31 | |
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| 32 | /* Access BITS */ |
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| 33 | #define DEBUGFS_ALLOW_API BIT(0) |
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| 34 | #define DEBUGFS_ALLOW_MOUNT BIT(1) |
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| 35 | |
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| 36 | #ifdef CONFIG_DEBUG_FS_ALLOW_ALL |
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| 37 | #define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_MOUNT | DEBUGFS_ALLOW_API) |
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| 38 | #endif |
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| 39 | #ifdef CONFIG_DEBUG_FS_DISALLOW_MOUNT |
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| 40 | #define DEFAULT_DEBUGFS_ALLOW_BITS (DEBUGFS_ALLOW_API) |
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| 41 | #endif |
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| 42 | #ifdef CONFIG_DEBUG_FS_ALLOW_NONE |
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| 43 | #define DEFAULT_DEBUGFS_ALLOW_BITS (0) |
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| 44 | #endif |
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| 45 | |
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| 46 | #endif /* _DEBUGFS_INTERNAL_H_ */ |
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| 47 | |
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