Commit | Line | Data |
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d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
bbb1e54d MS |
2 | /* |
3 | * | |
4 | * Copyright (C) 2011 Novell Inc. | |
5 | * Copyright (C) 2016 Red Hat, Inc. | |
bbb1e54d MS |
6 | */ |
7 | ||
8 | struct ovl_config { | |
9 | char *lowerdir; | |
10 | char *upperdir; | |
11 | char *workdir; | |
12 | bool default_permissions; | |
a6c60655 | 13 | bool redirect_dir; |
438c84c2 MS |
14 | bool redirect_follow; |
15 | const char *redirect_mode; | |
02bcd157 | 16 | bool index; |
5830fb6b | 17 | bool uuid; |
f168f109 | 18 | bool nfs_export; |
795939a9 | 19 | int xino; |
d5791044 | 20 | bool metacopy; |
2d2f2d73 | 21 | bool userxattr; |
c86243b0 | 22 | bool ovl_volatile; |
bbb1e54d MS |
23 | }; |
24 | ||
5148626b AG |
25 | struct ovl_sb { |
26 | struct super_block *sb; | |
27 | dev_t pseudo_dev; | |
7e63c87f AG |
28 | /* Unusable (conflicting) uuid */ |
29 | bool bad_uuid; | |
1b81dddd AG |
30 | /* Used as a lower layer (but maybe also as upper) */ |
31 | bool is_lower; | |
5148626b AG |
32 | }; |
33 | ||
b9343632 CR |
34 | struct ovl_layer { |
35 | struct vfsmount *mnt; | |
146d62e5 AG |
36 | /* Trap in ovl inode cache */ |
37 | struct inode *trap; | |
5148626b AG |
38 | struct ovl_sb *fs; |
39 | /* Index of this layer in fs root (upper idx == 0) */ | |
d583ed7d | 40 | int idx; |
5148626b AG |
41 | /* One fsid per unique underlying sb (upper fsid == 0) */ |
42 | int fsid; | |
b9343632 CR |
43 | }; |
44 | ||
45 | struct ovl_path { | |
13464165 | 46 | const struct ovl_layer *layer; |
b9343632 CR |
47 | struct dentry *dentry; |
48 | }; | |
49 | ||
0af950f5 AG |
50 | struct ovl_entry { |
51 | unsigned int __numlower; | |
52 | struct ovl_path __lowerstack[]; | |
53 | }; | |
54 | ||
bbb1e54d MS |
55 | /* private information held for overlayfs's superblock */ |
56 | struct ovl_fs { | |
94375f9d | 57 | unsigned int numlayer; |
07f1e596 AG |
58 | /* Number of unique fs among layers including upper fs */ |
59 | unsigned int numfs; | |
37ebf056 AG |
60 | /* Number of data-only lower layers */ |
61 | unsigned int numdatalayer; | |
13464165 | 62 | const struct ovl_layer *layers; |
07f1e596 | 63 | struct ovl_sb *fs; |
2cac0c00 AG |
64 | /* workbasedir is the path at workdir= mount option */ |
65 | struct dentry *workbasedir; | |
66 | /* workdir is the 'work' directory under workbasedir */ | |
bbb1e54d | 67 | struct dentry *workdir; |
02bcd157 AG |
68 | /* index directory listing overlay inodes by origin file handle */ |
69 | struct dentry *indexdir; | |
6b2d5fe4 | 70 | long namelen; |
bbb1e54d MS |
71 | /* pathnames of lower and upper dirs, for show_options */ |
72 | struct ovl_config config; | |
73 | /* creds of process who forced instantiation of super block */ | |
74 | const struct cred *creator_cred; | |
e7f52429 | 75 | bool tmpfile; |
82b749b2 | 76 | bool noxattr; |
85fdee1e AG |
77 | /* Did we take the inuse lock? */ |
78 | bool upperdir_locked; | |
79 | bool workdir_locked; | |
c21c839b | 80 | bool share_whiteout; |
146d62e5 | 81 | /* Traps in ovl inode cache */ |
0be0bfd2 | 82 | struct inode *workbasedir_trap; |
146d62e5 AG |
83 | struct inode *workdir_trap; |
84 | struct inode *indexdir_trap; | |
0f831ec8 AG |
85 | /* -1: disabled, 0: same fs, 1..32: number of unused ino bits */ |
86 | int xino_mode; | |
4d314f78 AG |
87 | /* For allocation of non-persistent inode numbers */ |
88 | atomic_long_t last_ino; | |
c21c839b CX |
89 | /* Whiteout dentry cache */ |
90 | struct dentry *whiteout; | |
335d3fc5 SD |
91 | /* r/o snapshot of upperdir sb's only taken on volatile mounts */ |
92 | errseq_t errseq; | |
bbb1e54d MS |
93 | }; |
94 | ||
37ebf056 AG |
95 | |
96 | /* Number of lower layers, not including data-only layers */ | |
97 | static inline unsigned int ovl_numlowerlayer(struct ovl_fs *ofs) | |
98 | { | |
99 | return ofs->numlayer - ofs->numdatalayer - 1; | |
100 | } | |
101 | ||
08f4c7c8 MS |
102 | static inline struct vfsmount *ovl_upper_mnt(struct ovl_fs *ofs) |
103 | { | |
b8e42a65 | 104 | return ofs->layers[0].mnt; |
08f4c7c8 MS |
105 | } |
106 | ||
abf08576 CB |
107 | static inline struct mnt_idmap *ovl_upper_mnt_idmap(struct ovl_fs *ofs) |
108 | { | |
109 | return mnt_idmap(ovl_upper_mnt(ofs)); | |
110 | } | |
111 | ||
0f831ec8 AG |
112 | static inline struct ovl_fs *OVL_FS(struct super_block *sb) |
113 | { | |
114 | return (struct ovl_fs *)sb->s_fs_info; | |
115 | } | |
116 | ||
c86243b0 VG |
117 | static inline bool ovl_should_sync(struct ovl_fs *ofs) |
118 | { | |
119 | return !ofs->config.ovl_volatile; | |
120 | } | |
121 | ||
5522c9c7 AG |
122 | static inline unsigned int ovl_numlower(struct ovl_entry *oe) |
123 | { | |
124 | return oe ? oe->__numlower : 0; | |
125 | } | |
126 | ||
127 | static inline struct ovl_path *ovl_lowerstack(struct ovl_entry *oe) | |
128 | { | |
129 | return ovl_numlower(oe) ? oe->__lowerstack : NULL; | |
130 | } | |
131 | ||
ac900ed4 AG |
132 | static inline struct ovl_path *ovl_lowerpath(struct ovl_entry *oe) |
133 | { | |
134 | return ovl_lowerstack(oe); | |
135 | } | |
136 | ||
ab1eb5ff AG |
137 | static inline struct ovl_path *ovl_lowerdata(struct ovl_entry *oe) |
138 | { | |
139 | struct ovl_path *lowerstack = ovl_lowerstack(oe); | |
140 | ||
141 | return lowerstack ? &lowerstack[oe->__numlower - 1] : NULL; | |
142 | } | |
143 | ||
144 | static inline struct dentry *ovl_lowerdata_dentry(struct ovl_entry *oe) | |
145 | { | |
146 | struct ovl_path *lowerdata = ovl_lowerdata(oe); | |
147 | ||
148 | return lowerdata ? lowerdata->dentry : NULL; | |
149 | } | |
150 | ||
0af950f5 | 151 | /* private information held for every overlayfs dentry */ |
a6ff2bc0 AG |
152 | static inline unsigned long *OVL_E_FLAGS(struct dentry *dentry) |
153 | { | |
0af950f5 | 154 | return (unsigned long *) &dentry->d_fsdata; |
a6ff2bc0 AG |
155 | } |
156 | ||
13cf199d | 157 | struct ovl_inode { |
2664bd08 VG |
158 | union { |
159 | struct ovl_dir_cache *cache; /* directory */ | |
ab1eb5ff | 160 | /* place holder for non-dir */ /* regular file */ |
2664bd08 | 161 | }; |
cf31c463 | 162 | const char *redirect; |
04a01ac7 | 163 | u64 version; |
13c72075 | 164 | unsigned long flags; |
13cf199d | 165 | struct inode vfs_inode; |
09d8b586 | 166 | struct dentry *__upperdentry; |
0af950f5 | 167 | struct ovl_entry *oe; |
a015dafc AG |
168 | |
169 | /* synchronize copy up and more */ | |
170 | struct mutex lock; | |
13cf199d AG |
171 | }; |
172 | ||
173 | static inline struct ovl_inode *OVL_I(struct inode *inode) | |
174 | { | |
175 | return container_of(inode, struct ovl_inode, vfs_inode); | |
176 | } | |
09d8b586 | 177 | |
0af950f5 AG |
178 | static inline struct ovl_entry *OVL_I_E(struct inode *inode) |
179 | { | |
180 | return inode ? OVL_I(inode)->oe : NULL; | |
181 | } | |
182 | ||
183 | static inline struct ovl_entry *OVL_E(struct dentry *dentry) | |
184 | { | |
185 | return OVL_I_E(d_inode(dentry)); | |
186 | } | |
187 | ||
09d8b586 MS |
188 | static inline struct dentry *ovl_upperdentry_dereference(struct ovl_inode *oi) |
189 | { | |
506458ef | 190 | return READ_ONCE(oi->__upperdentry); |
09d8b586 | 191 | } |