| 1 | |
| 2 | |
| 3 | File: fs/ext4/acl.h
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| 4 |
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| 5 | (C) 2001 Andreas Gruenbacher, <[email protected]>
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| 6 |
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| 7 |
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| 8 | #include <linux/posix_acl_xattr.h>
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| 9 |
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| 10 | #define EXT4_ACL_VERSION 0x0001
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| 11 |
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| 12 | typedef struct {
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| 13 | __le16 e_tag;
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| 14 | __le16 e_perm;
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| 15 | __le32 e_id;
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| 16 | } ext4_acl_entry;
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| 17 |
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| 18 | typedef struct {
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| 19 | __le16 e_tag;
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| 20 | __le16 e_perm;
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| 21 | } ext4_acl_entry_short;
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| 22 |
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| 23 | typedef struct {
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| 24 | __le32 a_version;
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| 25 | } ext4_acl_header;
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| 26 |
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| 27 | static inline size_t ext4_acl_size(int count)
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| 28 | {
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| 29 | if (count <= 4) {
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| 30 | return sizeof(ext4_acl_header) +
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| 31 | count * sizeof(ext4_acl_entry_short);
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| 32 | } else {
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| 33 | return sizeof(ext4_acl_header) +
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| 34 | 4 * sizeof(ext4_acl_entry_short) +
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| 35 | (count - 4) * sizeof(ext4_acl_entry);
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| 36 | }
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| 37 | }
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| 38 |
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| 39 | static inline int ext4_acl_count(size_t size)
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| 40 | {
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| 41 | ssize_t s;
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| 42 | size -= sizeof(ext4_acl_header);
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| 43 | s = size - 4 * sizeof(ext4_acl_entry_short);
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| 44 | if (s < 0) {
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| 45 | if (size % sizeof(ext4_acl_entry_short))
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| 46 | return -1;
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| 47 | return size / sizeof(ext4_acl_entry_short);
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| 48 | } else {
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| 49 | if (s % sizeof(ext4_acl_entry))
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| 50 | return -1;
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| 51 | return s / sizeof(ext4_acl_entry) + 4;
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| 52 | }
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| 53 | }
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| 54 |
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| 55 | #ifdef CONFIG_EXT4_FS_POSIX_ACL
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| 56 |
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| 57 |
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| 58 | struct posix_acl *ext4_get_acl(struct inode *inode, int type, bool rcu);
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| 59 | int ext4_set_acl(const struct mnt_idmap *idmap, struct dentry *dentry,
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| 60 | struct posix_acl *acl, int type);
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| 61 | extern int ext4_init_acl(handle_t *, struct inode *, struct inode *);
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| 62 |
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| 63 | #else
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| 64 | #include <linux/sched.h>
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| 65 | #define ext4_get_acl NULL
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| 66 | #define ext4_set_acl NULL
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| 67 |
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| 68 | static inline int
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| 69 | ext4_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
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| 70 | {
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| 71 | return 0;
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| 72 | }
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| 73 | #endif
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| 74 |
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