Lines Matching +full:first +full:- +full:generation

1 .. SPDX-License-Identifier: GPL-2.0
4 ------------------------------
22 means of an (up to) three level 1-1 block map. To find the logical block
64 stored in ``inode.i_block``, which allows for the first four extents to
70 .. list-table::
72    :header-rows: 1
74    * - Offset
75      - Size
76      - Name
77      - Description
78    * - 0x0
79      - __le16
80      - eh_magic
81      - Magic number, 0xF30A.
82    * - 0x2
83      - __le16
84      - eh_entries
85      - Number of valid entries following the header.
86    * - 0x4
87      - __le16
88      - eh_max
89      - Maximum number of entries that could follow the header.
90    * - 0x6
91      - __le16
92      - eh_depth
93      - Depth of this extent node in the extent tree. 0 = this extent node
97        satisfies ``4*(((blocksize - 12)/12)^n) >= 2^32`` is 5.
98    * - 0x8
99      - __le32
100      - eh_generation
101      - Generation of the tree. (Used by Lustre, but not standard ext4).
106 .. list-table::
108    :header-rows: 1
110    * - Offset
111      - Size
112      - Name
113      - Description
114    * - 0x0
115      - __le32
116      - ei_block
117      - This index node covers file blocks from 'block' onward.
118    * - 0x4
119      - __le32
120      - ei_leaf_lo
121      - Lower 32-bits of the block number of the extent node that is the next
124    * - 0x8
125      - __le16
126      - ei_leaf_hi
127      - Upper 16-bits of the previous field.
128    * - 0xA
129      - __u16
130      - ei_unused
131      -
136 .. list-table::
138    :header-rows: 1
140    * - Offset
141      - Size
142      - Name
143      - Description
144    * - 0x0
145      - __le32
146      - ee_block
147      - First file block number that this extent covers.
148    * - 0x4
149      - __le16
150      - ee_len
151      - Number of blocks covered by extent. If the value of this field is <=
153        the extent is uninitialized and the actual extent length is ``ee_len`` -
156    * - 0x6
157      - __le16
158      - ee_start_hi
159      - Upper 16-bits of the block number to which this extent points.
160    * - 0x8
161      - __le32
162      - ee_start_lo
163      - Lower 32-bits of the block number to which this extent points.
168 the 32-bit checksum is inserted into this space. The 4 extents in the
171 inode generation, and the entire extent block leading up to (but not
176 .. list-table::
178    :header-rows: 1
180    * - Offset
181      - Size
182      - Name
183      - Description
184    * - 0x0
185      - __le32
186      - eb_checksum
187      - Checksum of the extent block, crc32c(uuid+inum+igeneration+extentblock)
193 set for the inode, it is possible that the first 60 bytes of the file