ext2 | 易学教程

What's wrong with linux/ext2_fs.h?

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问题 cat main.c #include <stdio.h> #include <stdlib.h> #include <linux/ext2_fs.h> int main(int argc, char** argv) { return (EXIT_SUCCESS); } Here is my output... gcc main.c In file included from main.c:3: /usr/include/linux/ext2_fs.h: In function ‘ext2_mask_flags’: /usr/include/linux/ext2_fs.h:182: error: ‘FS_DIRSYNC_FL’ undeclared (first use in this function) /usr/include/linux/ext2_fs.h:182: error: (Each undeclared identifier is reported only once /usr/include/linux/ext2_fs.h:182: error: for

What's wrong with linux/ext2_fs.h?

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How to quickly create large files in C?

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问题 I am doing research on file system performance, and I am stumped on how to create a very large file very quickly in C. Basically, I am trying to re-create a file system's folders and files by taking this metadata and storing it into a file. This is the extraction process. Later, I want to restore those folders and files into an existing freshly-made file system (in this case, ext3) using the metadata I previously extracted. In the restore process, I have already succeeded in creating all the

Is there an official specification for the ext2/ext3/ext4 filesystems?

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问题 I was wondering, for Bluetooth we have IEEE 802.15.1 standard, managed by Bluetooth Special Interest Group. For Wifi we have the IEEE 802.11 standards and also the Wifi Alliance. For NVMe SSDs on PCIe we have nvmexpress that regulate and publish its official documentation. So, usually there is a regulatory agency who decides things and standardize how some things should be to allow interoperability between several different implementations. But for the ext2/ext3/ext4 filesystems I didn't find

FTP vs SFTP vs HDFS vs NTFS vs EXT2, EXT3 [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 5 years ago . I just want to know how these protocols and file systems are related with each other, where each one is used. FTP vs SFTP vs HDFS vs NTFS vs EXT2, EXT3 any help would be appreciated. Thanks. 回答1: FTP is an old File Transfer Protocol, similar to HTTP but specialized for moving large files. sftp is a totally

How do I read and traverse inodes

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问题 I've opened the super-block and group descriptor in an EXT2 filesystem, but I don't know how to read for instance the root directory or files in it... Here's some of what i got fd=open("/dev/sdb2", O_RDONLY); lseek(fd, SuperSize, SEEK_SET); read(fd, &super_block, SuperSize); lseek(fd, 4096, SEEK_SET); read(fd, &groupDesc, DescriptSize); but this next part doesn't seem to work... lseek(fd, super_block.s_log_block_size*groupDesc.bg_inode_table, SEEK_SET); lseek(fd, InodeSize*(EXT2_ROOT_INO-1),

How do I read and traverse inodes

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I've opened the super-block and group descriptor in an EXT2 filesystem, but I don't know how to read for instance the root directory or files in it... Here's some of what i got fd=open("/dev/sdb2", O_RDONLY); lseek(fd, SuperSize, SEEK_SET); read(fd, &super_block, SuperSize); lseek(fd, 4096, SEEK_SET); read(fd, &groupDesc, DescriptSize); but this next part doesn't seem to work... lseek(fd, super_block.s_log_block_size*groupDesc.bg_inode_table, SEEK_SET); lseek(fd, InodeSize*(EXT2_ROOT_INO-1), SEEK_CUR); read(fd, &root, InodeSize); I'm not totally clear what you're asking, but here goes: To read

How to get the offset in a block device of an inode in a deleted partition

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问题 During a fresh installation, I accidentally formatted a disk containing datas. I have tried using some tools: testdisk, foremost, but I did not get good results. (see my unsuccessful post on superuser). So I have decided to read some docs about ext2 filesystem structure, and I could get some results: The deleted partition have a directory tree like that: dev |-scripts |-projects |-services |-... Medias |-downloads |-Musique |-... backup ... So, based on the ext2 directory entry format:

What does it mean by cold cache and warm cache concept?

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I read a paper and it used terms cold cache and warm cache . I googled about this terms but I didn't find something useful (only a thread here ). What do these terms mean? Alexander Dzyoba TL;DR There is an analogy with a cold engine and warm engine of the car. Cold cache - doesn't have any values and can't give you any speedup because, well, it's empty. Warm cache has some values and can give you that speedup. A cache is a structure that holds some values (inodes, memory pages, disk blocks, etc.) for faster lookup. Cache works by storing some kind of short references in a fast search data

What does it mean by cold cache and warm cache concept?

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问题 I read a paper and it used terms cold cache and warm cache . I googled about this terms but I didn't find something useful (only a thread here). What do these terms mean? 回答1: TL;DR There is an analogy with a cold engine and warm engine of the car. Cold cache - doesn't have any values and can't give you any speedup because, well, it's empty. Warm cache has some values and can give you that speedup. A cache is a structure that holds some values (inodes, memory pages, disk blocks, etc.) for