Logical choice of configuration keywords, not just copy/paste between various bootloader configurations. `make modules_install install` at the end of a Linux kernel compilation cyclus grubby will install the Linux kernel with the 'kernel' keyword and will not recognise kernels already insatlled with the 'linux' keyword. MENU AUTOBOOT Starting Fedora in # second.Īppend root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/root rd.lvm.lv=fedora/swap rd.lvm.lv=fedora/usr net.ifnames=0 systemd.log_level=warning selinux=0 audit=0 plymouth.enable=0 3 LANG=en_US.UTF-8 threadirqs pci=noaer Syslinux-extlinux-nonlinux-6.04-0.8.fc28.noarch Version-Release number of selected component (if applicable): This also avoids issues with certain kernel names leading to interpretations of kernel types/formats It would be more logical to use the 'linux' keyword instead as this specifies a Linux kernel only. * Reads the page asynchronously - the unlock_buffer() and * set/clear_buffer_uptodate() functions propagate buffer state into the * page struct once IO has completed.In the parsing of the nf file grubby expects kernels listed by the 'kernel' keyword (meaning just any kernel type to be expected). This is most of the block device filesystems. * * Return: * * number of bytes copied, even for partial reads * * negative error code (or 0 if IOCB_NOIO) if nothing was read */ ssize_t generic_file_read_iter ( struct kiocb * iocb, struct iov_iter * iter ) /* * Generic "read page" function for block devices that have the normal * get_block functionality. When readahead would be * triggered, a partial, possibly empty read shall be returned. When no data * can be read, -EAGAIN shall be returned. * * The IOCB_NOIO flag in iocb->ki_flags indicates that no new I/O * requests shall be made for the read or for readahead. * * The IOCB_NOWAIT flag in iocb->ki_flags indicates that -EAGAIN shall * be returned when no data can be read without waiting for I/O requests * to complete it doesn't prevent readahead. ** * generic_file_read_iter - generic filesystem read routine * kernel I/O control block * destination for the data read * * This is the "read_iter()" routine for all filesystems * that can use the page cache directly. * 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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