projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 08ce5f16 SH |
2 | #include <linux/fs.h> |
| 3 | ||
| ecf8fecb RG |
4 | #define DEVCG_ACC_MKNOD 1 |
| 5 | #define DEVCG_ACC_READ 2 | |
| 6 | #define DEVCG_ACC_WRITE 4 | |
| 7 | #define DEVCG_ACC_MASK (DEVCG_ACC_MKNOD | DEVCG_ACC_READ | DEVCG_ACC_WRITE) | |
| 8 | ||
| 9 | #define DEVCG_DEV_BLOCK 1 | |
| 10 | #define DEVCG_DEV_CHAR 2 | |
| 11 | #define DEVCG_DEV_ALL 4 /* this represents all devices */ | |
| 12 | ||
| ecf8fecb | 13 | |
| ebc614f6 | 14 | #if defined(CONFIG_CGROUP_DEVICE) || defined(CONFIG_CGROUP_BPF) |
| eec8fd02 OU |
15 | int devcgroup_check_permission(short type, u32 major, u32 minor, |
| 16 | short access); | |
| 482e0cd3 AV |
17 | static inline int devcgroup_inode_permission(struct inode *inode, int mask) |
| 18 | { | |
| ecf8fecb RG |
19 | short type, access = 0; |
| 20 | ||
| 482e0cd3 AV |
21 | if (likely(!inode->i_rdev)) |
| 22 | return 0; | |
| ecf8fecb RG |
23 | |
| 24 | if (S_ISBLK(inode->i_mode)) | |
| 25 | type = DEVCG_DEV_BLOCK; | |
| 26 | else if (S_ISCHR(inode->i_mode)) | |
| 27 | type = DEVCG_DEV_CHAR; | |
| 28 | else | |
| 482e0cd3 | 29 | return 0; |
| ecf8fecb RG |
30 | |
| 31 | if (mask & MAY_WRITE) | |
| 32 | access |= DEVCG_ACC_WRITE; | |
| 33 | if (mask & MAY_READ) | |
| 34 | access |= DEVCG_ACC_READ; | |
| 35 | ||
| 36 | return devcgroup_check_permission(type, imajor(inode), iminor(inode), | |
| 37 | access); | |
| 482e0cd3 | 38 | } |
| ecf8fecb RG |
39 | |
| 40 | static inline int devcgroup_inode_mknod(int mode, dev_t dev) | |
| 41 | { | |
| 42 | short type; | |
| 43 | ||
| 44 | if (!S_ISBLK(mode) && !S_ISCHR(mode)) | |
| 45 | return 0; | |
| 46 | ||
| a3c751a5 MS |
47 | if (S_ISCHR(mode) && dev == WHITEOUT_DEV) |
| 48 | return 0; | |
| 49 | ||
| ecf8fecb RG |
50 | if (S_ISBLK(mode)) |
| 51 | type = DEVCG_DEV_BLOCK; | |
| 52 | else | |
| 53 | type = DEVCG_DEV_CHAR; | |
| 54 | ||
| 55 | return devcgroup_check_permission(type, MAJOR(dev), MINOR(dev), | |
| 56 | DEVCG_ACC_MKNOD); | |
| 57 | } | |
| 58 | ||
| 08ce5f16 | 59 | #else |
| eec8fd02 OU |
60 | static inline int devcgroup_check_permission(short type, u32 major, u32 minor, |
| 61 | short access) | |
| 62 | { return 0; } | |
| 08ce5f16 SH |
63 | static inline int devcgroup_inode_permission(struct inode *inode, int mask) |
| 64 | { return 0; } | |
| 65 | static inline int devcgroup_inode_mknod(int mode, dev_t dev) | |
| 66 | { return 0; } | |
| 67 | #endif |