![]() ![]() * For use by the owner of the address_space. * The most recent error which has occurred. * Shadow or DAX entries, protected by the i_pages lock. * Protects and * Number of page entries, protected by the i_pages lock. ![]() * Number of THPs in the pagecache (non-shmem only). * Memory allocation flags to use for allocating pages. * Owner, either the inode or the block_device. ** * struct address_space - Contents of a cacheable, mappable object. the DMAP area is comprised of multiple blocks which contains aīitmap for data blocks it maintains the allocated/free state for.the IMAP area is comprised of multiple blocks which contains aīitmap for inode allocation it maintains the allocated/free state.the superblock contains information about the block size as well as.The next diagram show a very simple filesystem where blocks are The diagram shows that the superblock is typically stored at theīeginning of the fileystem and that various blocks are used withĭifferent purposes: some to store dentries, some to store inodes and The following diagram shows the relationship of the filesystem Multiple dentries can point to the same inode when hard links are Multiple file abstractions can point to the same dentry if we open Use the dup() system call to duplicate a file descriptor. Multiple file descriptors can point to the same file because we can Note that not all of the one to many relationships between the various The following diagram shows the relationship between the various filesystem Storage and in memory (for caching purposes). The dentry associates a name with an inode. The file name is not a property of the file. Unique way and has various properties such as the file size, access It exists both on storageĪnd in memory (for caching purposes). The file abstraction contains information about an opened file suchĪs the current file pointer. Is present both on storage and in memory (for caching purposes). Instance such as the block size, the root inode, filesystem size. The superblock abstraction contains information about the filesystem Some of these abstractions are present both on disk and in memory While filesystems use different data structures to organizing theįiles, directories, user data and meta (internal) data on storageĭevices there are a few common abstractions that are used in almost We can have multiple instances of the same filesystem type in use. FAT, ext4, btrfs, ntfs) and on one running system A fileystem is a way to organize files and directories on storageĭevices such as hard disks, SSDs or flash memory. ![]()
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