Lines Matching +full:block +full:- +full:number

1 .. SPDX-License-Identifier: GPL-2.0
4 -------------------------
10 sequence number. If the sequence number is EXT4_MMP_SEQ_CLEAN, the
11 open continues. If the sequence number is EXT4_MMP_SEQ_FSCK, then
14 the sequence number again. If the sequence number has changed, then the
16 code passes all of those checks, a new MMP sequence number is generated
17 and written to the MMP block, and the mount proceeds.
19 While the filesystem is live, the kernel sets up a timer to re-check the
20 MMP block at the specified MMP check interval. To perform the re-check,
21 the MMP sequence number is re-read; if it does not match the in-memory
22 MMP sequence number, then another node (node B) has mounted the
23 filesystem, and node A remounts the filesystem read-only. If the
24 sequence numbers match, the sequence number is incremented both in
25 memory and on disk, and the re-check is complete.
27 The hostname and device filename are written into the MMP block whenever
34 .. list-table::
36    :header-rows: 1
38    * - Offset
39      - Type
40      - Name
41      - Description
42    * - 0x0
43      - __le32
44      - mmp_magic
45      - Magic number for MMP, 0x004D4D50 (“MMP”).
46    * - 0x4
47      - __le32
48      - mmp_seq
49      - Sequence number, updated periodically.
50    * - 0x8
51      - __le64
52      - mmp_time
53      - Time that the MMP block was last updated.
54    * - 0x10
55      - char[64]
56      - mmp_nodename
57      - Hostname of the node that opened the filesystem.
58    * - 0x50
59      - char[32]
60      - mmp_bdevname
61      - Block device name of the filesystem.
62    * - 0x70
63      - __le16
64      - mmp_check_interval
65      - The MMP re-check interval, in seconds.
66    * - 0x72
67      - __le16
68      - mmp_pad1
69      - Zero.
70    * - 0x74
71      - __le32[226]
72      - mmp_pad2
73      - Zero.
74    * - 0x3FC
75      - __le32
76      - mmp_checksum
77      - Checksum of the MMP block.