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Getting sector number from inode or address_space mapping
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Why I closed the “Why is Kali so hard” questionDisk problems prevent me from booting, or set the disk to read-only. How do I fix the disk?Stat, Blocks and Sector size - ext4How to extract raw ext3 inode data from disk?How to use the new Ext4 Inline Data feature ? (storing data directly in the inode)Disk usage in stat output and inodeHow can I zero the unused blocks on my filesystem in order to minimize the compressed disk image size?How can I find the last sector used by an ext4 filesystem?Filesystem design: necessity of inode number and tableHow do inode numbers from ls -i relate to inodes on diskCan ext4 filesystem withstand a bad sector (unreadable)?
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In am trying to understand how to calculate a sector number from an inode in the ext4 filesystem. Therefore, I am reading ext4_mpage_readpages function.
About the function:
During a read request, if the page is not found in the page cache, a new page is allocated and added to the page cache. After that, the above function is called to get the data from the disk and fill it in the page.
I know that the size of a page is 4096 bytes, and that blocks are of 512 bytes (therefore, a page consists of 8 blocks). From what I understood, the above function maps the block numbers to pages in blocks[page_block] at these places: here and here. After mapping the blocks, the function allocates a bio, assigns the sector to read from, and calls the generic_make_request() to read the data from the disk.
I am getting confused in understanding how the above function calculates sector given an address_space mapping. Is there any other way to get a sector number from an inode in ext4 filesystem?
filesystems linux-kernel ext4 disk block-device
asked 4 hours ago
bvsravikiranbvsravikiran
113
add a comment |
In am trying to understand how to calculate a sector number from an inode in the ext4 filesystem. Therefore, I am reading ext4_mpage_readpages function.
About the function:
During a read request, if the page is not found in the page cache, a new page is allocated and added to the page cache. After that, the above function is called to get the data from the disk and fill it in the page.
I know that the size of a page is 4096 bytes, and that blocks are of 512 bytes (therefore, a page consists of 8 blocks). From what I understood, the above function maps the block numbers to pages in blocks[page_block] at these places: here and here. After mapping the blocks, the function allocates a bio, assigns the sector to read from, and calls the generic_make_request() to read the data from the disk.
I am getting confused in understanding how the above function calculates sector given an address_space mapping. Is there any other way to get a sector number from an inode in ext4 filesystem?
filesystems linux-kernel ext4 disk block-device
asked 4 hours ago
bvsravikiranbvsravikiran
113
If you want to understand the layout, this guide should help.
– Wumpus Q. Wumbley
3 hours ago
add a comment |
In am trying to understand how to calculate a sector number from an inode in the ext4 filesystem. Therefore, I am reading ext4_mpage_readpages function.
About the function:
During a read request, if the page is not found in the page cache, a new page is allocated and added to the page cache. After that, the above function is called to get the data from the disk and fill it in the page.
I know that the size of a page is 4096 bytes, and that blocks are of 512 bytes (therefore, a page consists of 8 blocks). From what I understood, the above function maps the block numbers to pages in blocks[page_block] at these places: here and here. After mapping the blocks, the function allocates a bio, assigns the sector to read from, and calls the generic_make_request() to read the data from the disk.
I am getting confused in understanding how the above function calculates sector given an address_space mapping. Is there any other way to get a sector number from an inode in ext4 filesystem?
filesystems linux-kernel ext4 disk block-device
asked 4 hours ago
bvsravikiranbvsravikiran
113
In am trying to understand how to calculate a sector number from an inode in the ext4 filesystem. Therefore, I am reading ext4_mpage_readpages function.
About the function:
During a read request, if the page is not found in the page cache, a new page is allocated and added to the page cache. After that, the above function is called to get the data from the disk and fill it in the page.
I know that the size of a page is 4096 bytes, and that blocks are of 512 bytes (therefore, a page consists of 8 blocks). From what I understood, the above function maps the block numbers to pages in blocks[page_block] at these places: here and here. After mapping the blocks, the function allocates a bio, assigns the sector to read from, and calls the generic_make_request() to read the data from the disk.
I am getting confused in understanding how the above function calculates sector given an address_space mapping. Is there any other way to get a sector number from an inode in ext4 filesystem?
filesystems linux-kernel ext4 disk block-device
filesystems linux-kernel ext4 disk block-device
asked 4 hours ago
bvsravikiranbvsravikiran
113
asked 4 hours ago
bvsravikiranbvsravikiran
113
edited 4 hours ago
bvsravikiran
asked 4 hours ago
bvsravikiranbvsravikiran
113
asked 4 hours ago
bvsravikiranbvsravikiran
113
asked 4 hours ago
bvsravikiranbvsravikiran
113
113
If you want to understand the layout, this guide should help.
– Wumpus Q. Wumbley
3 hours ago
add a comment |
If you want to understand the layout, this guide should help.
– Wumpus Q. Wumbley
3 hours ago
If you want to understand the layout, this guide should help.
– Wumpus Q. Wumbley
3 hours ago
If you want to understand the layout, this guide should help.
– Wumpus Q. Wumbley
3 hours ago
add a comment |
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If you want to understand the layout, this guide should help.
– Wumpus Q. Wumbley
3 hours ago