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oasis-root

Compiled tree of Oasis Linux based on own branch at <https://hacktivis.me/git/oasis/> git clone https://anongit.hacktivis.me/git/oasis-root.git

mount.h (8310B)


  1. #ifndef _LINUX_MOUNT_H
  2. #define _LINUX_MOUNT_H
  3. #include <linux/types.h>
  4. /*
  5. * These are the fs-independent mount-flags: up to 32 flags are supported
  6. *
  7. * Usage of these is restricted within the kernel to core mount(2) code and
  8. * callers of sys_mount() only. Filesystems should be using the SB_*
  9. * equivalent instead.
  10. */
  11. #define MS_RDONLY 1 /* Mount read-only */
  12. #define MS_NOSUID 2 /* Ignore suid and sgid bits */
  13. #define MS_NODEV 4 /* Disallow access to device special files */
  14. #define MS_NOEXEC 8 /* Disallow program execution */
  15. #define MS_SYNCHRONOUS 16 /* Writes are synced at once */
  16. #define MS_REMOUNT 32 /* Alter flags of a mounted FS */
  17. #define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */
  18. #define MS_DIRSYNC 128 /* Directory modifications are synchronous */
  19. #define MS_NOSYMFOLLOW 256 /* Do not follow symlinks */
  20. #define MS_NOATIME 1024 /* Do not update access times. */
  21. #define MS_NODIRATIME 2048 /* Do not update directory access times */
  22. #define MS_BIND 4096
  23. #define MS_MOVE 8192
  24. #define MS_REC 16384
  25. #define MS_VERBOSE 32768 /* War is peace. Verbosity is silence.
  26. MS_VERBOSE is deprecated. */
  27. #define MS_SILENT 32768
  28. #define MS_POSIXACL (1<<16) /* VFS does not apply the umask */
  29. #define MS_UNBINDABLE (1<<17) /* change to unbindable */
  30. #define MS_PRIVATE (1<<18) /* change to private */
  31. #define MS_SLAVE (1<<19) /* change to slave */
  32. #define MS_SHARED (1<<20) /* change to shared */
  33. #define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */
  34. #define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */
  35. #define MS_I_VERSION (1<<23) /* Update inode I_version field */
  36. #define MS_STRICTATIME (1<<24) /* Always perform atime updates */
  37. #define MS_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */
  38. /* These sb flags are internal to the kernel */
  39. #define MS_SUBMOUNT (1<<26)
  40. #define MS_NOREMOTELOCK (1<<27)
  41. #define MS_NOSEC (1<<28)
  42. #define MS_BORN (1<<29)
  43. #define MS_ACTIVE (1<<30)
  44. #define MS_NOUSER (1<<31)
  45. /*
  46. * Superblock flags that can be altered by MS_REMOUNT
  47. */
  48. #define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\
  49. MS_LAZYTIME)
  50. /*
  51. * Old magic mount flag and mask
  52. */
  53. #define MS_MGC_VAL 0xC0ED0000
  54. #define MS_MGC_MSK 0xffff0000
  55. /*
  56. * open_tree() flags.
  57. */
  58. #define OPEN_TREE_CLONE 1 /* Clone the target tree and attach the clone */
  59. #define OPEN_TREE_CLOEXEC O_CLOEXEC /* Close the file on execve() */
  60. /*
  61. * move_mount() flags.
  62. */
  63. #define MOVE_MOUNT_F_SYMLINKS 0x00000001 /* Follow symlinks on from path */
  64. #define MOVE_MOUNT_F_AUTOMOUNTS 0x00000002 /* Follow automounts on from path */
  65. #define MOVE_MOUNT_F_EMPTY_PATH 0x00000004 /* Empty from path permitted */
  66. #define MOVE_MOUNT_T_SYMLINKS 0x00000010 /* Follow symlinks on to path */
  67. #define MOVE_MOUNT_T_AUTOMOUNTS 0x00000020 /* Follow automounts on to path */
  68. #define MOVE_MOUNT_T_EMPTY_PATH 0x00000040 /* Empty to path permitted */
  69. #define MOVE_MOUNT_SET_GROUP 0x00000100 /* Set sharing group instead */
  70. #define MOVE_MOUNT_BENEATH 0x00000200 /* Mount beneath top mount */
  71. #define MOVE_MOUNT__MASK 0x00000377
  72. /*
  73. * fsopen() flags.
  74. */
  75. #define FSOPEN_CLOEXEC 0x00000001
  76. /*
  77. * fspick() flags.
  78. */
  79. #define FSPICK_CLOEXEC 0x00000001
  80. #define FSPICK_SYMLINK_NOFOLLOW 0x00000002
  81. #define FSPICK_NO_AUTOMOUNT 0x00000004
  82. #define FSPICK_EMPTY_PATH 0x00000008
  83. /*
  84. * The type of fsconfig() call made.
  85. */
  86. enum fsconfig_command {
  87. FSCONFIG_SET_FLAG = 0, /* Set parameter, supplying no value */
  88. FSCONFIG_SET_STRING = 1, /* Set parameter, supplying a string value */
  89. FSCONFIG_SET_BINARY = 2, /* Set parameter, supplying a binary blob value */
  90. FSCONFIG_SET_PATH = 3, /* Set parameter, supplying an object by path */
  91. FSCONFIG_SET_PATH_EMPTY = 4, /* Set parameter, supplying an object by (empty) path */
  92. FSCONFIG_SET_FD = 5, /* Set parameter, supplying an object by fd */
  93. FSCONFIG_CMD_CREATE = 6, /* Create new or reuse existing superblock */
  94. FSCONFIG_CMD_RECONFIGURE = 7, /* Invoke superblock reconfiguration */
  95. FSCONFIG_CMD_CREATE_EXCL = 8, /* Create new superblock, fail if reusing existing superblock */
  96. };
  97. /*
  98. * fsmount() flags.
  99. */
  100. #define FSMOUNT_CLOEXEC 0x00000001
  101. /*
  102. * Mount attributes.
  103. */
  104. #define MOUNT_ATTR_RDONLY 0x00000001 /* Mount read-only */
  105. #define MOUNT_ATTR_NOSUID 0x00000002 /* Ignore suid and sgid bits */
  106. #define MOUNT_ATTR_NODEV 0x00000004 /* Disallow access to device special files */
  107. #define MOUNT_ATTR_NOEXEC 0x00000008 /* Disallow program execution */
  108. #define MOUNT_ATTR__ATIME 0x00000070 /* Setting on how atime should be updated */
  109. #define MOUNT_ATTR_RELATIME 0x00000000 /* - Update atime relative to mtime/ctime. */
  110. #define MOUNT_ATTR_NOATIME 0x00000010 /* - Do not update access times. */
  111. #define MOUNT_ATTR_STRICTATIME 0x00000020 /* - Always perform atime updates */
  112. #define MOUNT_ATTR_NODIRATIME 0x00000080 /* Do not update directory access times */
  113. #define MOUNT_ATTR_IDMAP 0x00100000 /* Idmap mount to @userns_fd in struct mount_attr. */
  114. #define MOUNT_ATTR_NOSYMFOLLOW 0x00200000 /* Do not follow symlinks */
  115. /*
  116. * mount_setattr()
  117. */
  118. struct mount_attr {
  119. __u64 attr_set;
  120. __u64 attr_clr;
  121. __u64 propagation;
  122. __u64 userns_fd;
  123. };
  124. /* List of all mount_attr versions. */
  125. #define MOUNT_ATTR_SIZE_VER0 32 /* sizeof first published struct */
  126. /*
  127. * Structure for getting mount/superblock/filesystem info with statmount(2).
  128. *
  129. * The interface is similar to statx(2): individual fields or groups can be
  130. * selected with the @mask argument of statmount(). Kernel will set the @mask
  131. * field according to the supported fields.
  132. *
  133. * If string fields are selected, then the caller needs to pass a buffer that
  134. * has space after the fixed part of the structure. Nul terminated strings are
  135. * copied there and offsets relative to @str are stored in the relevant fields.
  136. * If the buffer is too small, then EOVERFLOW is returned. The actually used
  137. * size is returned in @size.
  138. */
  139. struct statmount {
  140. __u32 size; /* Total size, including strings */
  141. __u32 mnt_opts; /* [str] Mount options of the mount */
  142. __u64 mask; /* What results were written */
  143. __u32 sb_dev_major; /* Device ID */
  144. __u32 sb_dev_minor;
  145. __u64 sb_magic; /* ..._SUPER_MAGIC */
  146. __u32 sb_flags; /* SB_{RDONLY,SYNCHRONOUS,DIRSYNC,LAZYTIME} */
  147. __u32 fs_type; /* [str] Filesystem type */
  148. __u64 mnt_id; /* Unique ID of mount */
  149. __u64 mnt_parent_id; /* Unique ID of parent (for root == mnt_id) */
  150. __u32 mnt_id_old; /* Reused IDs used in proc/.../mountinfo */
  151. __u32 mnt_parent_id_old;
  152. __u64 mnt_attr; /* MOUNT_ATTR_... */
  153. __u64 mnt_propagation; /* MS_{SHARED,SLAVE,PRIVATE,UNBINDABLE} */
  154. __u64 mnt_peer_group; /* ID of shared peer group */
  155. __u64 mnt_master; /* Mount receives propagation from this ID */
  156. __u64 propagate_from; /* Propagation from in current namespace */
  157. __u32 mnt_root; /* [str] Root of mount relative to root of fs */
  158. __u32 mnt_point; /* [str] Mountpoint relative to current root */
  159. __u64 mnt_ns_id; /* ID of the mount namespace */
  160. __u64 __spare2[49];
  161. char str[]; /* Variable size part containing strings */
  162. };
  163. /*
  164. * Structure for passing mount ID and miscellaneous parameters to statmount(2)
  165. * and listmount(2).
  166. *
  167. * For statmount(2) @param represents the request mask.
  168. * For listmount(2) @param represents the last listed mount id (or zero).
  169. */
  170. struct mnt_id_req {
  171. __u32 size;
  172. __u32 spare;
  173. __u64 mnt_id;
  174. __u64 param;
  175. __u64 mnt_ns_id;
  176. };
  177. /* List of all mnt_id_req versions. */
  178. #define MNT_ID_REQ_SIZE_VER0 24 /* sizeof first published struct */
  179. #define MNT_ID_REQ_SIZE_VER1 32 /* sizeof second published struct */
  180. /*
  181. * @mask bits for statmount(2)
  182. */
  183. #define STATMOUNT_SB_BASIC 0x00000001U /* Want/got sb_... */
  184. #define STATMOUNT_MNT_BASIC 0x00000002U /* Want/got mnt_... */
  185. #define STATMOUNT_PROPAGATE_FROM 0x00000004U /* Want/got propagate_from */
  186. #define STATMOUNT_MNT_ROOT 0x00000008U /* Want/got mnt_root */
  187. #define STATMOUNT_MNT_POINT 0x00000010U /* Want/got mnt_point */
  188. #define STATMOUNT_FS_TYPE 0x00000020U /* Want/got fs_type */
  189. #define STATMOUNT_MNT_NS_ID 0x00000040U /* Want/got mnt_ns_id */
  190. #define STATMOUNT_MNT_OPTS 0x00000080U /* Want/got mnt_opts */
  191. /*
  192. * Special @mnt_id values that can be passed to listmount
  193. */
  194. #define LSMT_ROOT 0xffffffffffffffff /* root mount */
  195. #define LISTMOUNT_REVERSE (1 << 0) /* List later mounts first */
  196. #endif /* _LINUX_MOUNT_H */