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9e9ad5f408
This patch makes UFS stop using the VFS '->write_super()' method along with the 's_dirt' superblock flag, because they are on their way out. The way we implement this is that we schedule a delay job instead relying on 's_dirt' and '->write_super()'. The whole "superblock write-out" VFS infrastructure is served by the 'sync_supers()' kernel thread, which wakes up every 5 (by default) seconds and writes out all dirty superblocks using the '->write_super()' call-back. But the problem with this thread is that it wastes power by waking up the system every 5 seconds, even if there are no diry superblocks, or there are no client file-systems which would need this (e.g., btrfs does not use '->write_super()'). So we want to kill it completely and thus, we need to make file-systems to stop using the '->write_super()' VFS service, and then remove it together with the kernel thread. Tested using fsstress from the LTP project. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
355 lines
9.2 KiB
C
355 lines
9.2 KiB
C
/*
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* linux/fs/ufs/ialloc.c
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*
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* Copyright (c) 1998
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* Daniel Pirkl <daniel.pirkl@email.cz>
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* Charles University, Faculty of Mathematics and Physics
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*
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* from
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*
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* linux/fs/ext2/ialloc.c
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* BSD ufs-inspired inode and directory allocation by
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* Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
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* Big-endian to little-endian byte-swapping/bitmaps by
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* David S. Miller (davem@caip.rutgers.edu), 1995
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*
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* UFS2 write support added by
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* Evgeniy Dushistov <dushistov@mail.ru>, 2007
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*/
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#include <linux/fs.h>
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#include <linux/time.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/buffer_head.h>
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#include <linux/sched.h>
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#include <linux/bitops.h>
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#include <asm/byteorder.h>
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#include "ufs_fs.h"
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#include "ufs.h"
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#include "swab.h"
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#include "util.h"
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/*
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* NOTE! When we get the inode, we're the only people
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* that have access to it, and as such there are no
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* race conditions we have to worry about. The inode
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* is not on the hash-lists, and it cannot be reached
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* through the filesystem because the directory entry
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* has been deleted earlier.
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*
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* HOWEVER: we must make sure that we get no aliases,
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* which means that we have to call "clear_inode()"
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* _before_ we mark the inode not in use in the inode
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* bitmaps. Otherwise a newly created file might use
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* the same inode number (not actually the same pointer
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* though), and then we'd have two inodes sharing the
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* same inode number and space on the harddisk.
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*/
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void ufs_free_inode (struct inode * inode)
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{
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struct super_block * sb;
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struct ufs_sb_private_info * uspi;
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struct ufs_super_block_first * usb1;
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struct ufs_cg_private_info * ucpi;
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struct ufs_cylinder_group * ucg;
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int is_directory;
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unsigned ino, cg, bit;
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UFSD("ENTER, ino %lu\n", inode->i_ino);
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sb = inode->i_sb;
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uspi = UFS_SB(sb)->s_uspi;
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usb1 = ubh_get_usb_first(uspi);
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ino = inode->i_ino;
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lock_super (sb);
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if (!((ino > 1) && (ino < (uspi->s_ncg * uspi->s_ipg )))) {
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ufs_warning(sb, "ufs_free_inode", "reserved inode or nonexistent inode %u\n", ino);
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unlock_super (sb);
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return;
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}
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cg = ufs_inotocg (ino);
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bit = ufs_inotocgoff (ino);
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ucpi = ufs_load_cylinder (sb, cg);
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if (!ucpi) {
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unlock_super (sb);
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return;
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}
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ucg = ubh_get_ucg(UCPI_UBH(ucpi));
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if (!ufs_cg_chkmagic(sb, ucg))
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ufs_panic (sb, "ufs_free_fragments", "internal error, bad cg magic number");
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ucg->cg_time = cpu_to_fs32(sb, get_seconds());
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is_directory = S_ISDIR(inode->i_mode);
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if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit))
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ufs_error(sb, "ufs_free_inode", "bit already cleared for inode %u", ino);
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else {
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ubh_clrbit (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit);
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if (ino < ucpi->c_irotor)
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ucpi->c_irotor = ino;
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fs32_add(sb, &ucg->cg_cs.cs_nifree, 1);
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uspi->cs_total.cs_nifree++;
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fs32_add(sb, &UFS_SB(sb)->fs_cs(cg).cs_nifree, 1);
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if (is_directory) {
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fs32_sub(sb, &ucg->cg_cs.cs_ndir, 1);
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uspi->cs_total.cs_ndir--;
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fs32_sub(sb, &UFS_SB(sb)->fs_cs(cg).cs_ndir, 1);
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}
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}
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ubh_mark_buffer_dirty (USPI_UBH(uspi));
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ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
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if (sb->s_flags & MS_SYNCHRONOUS)
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ubh_sync_block(UCPI_UBH(ucpi));
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ufs_mark_sb_dirty(sb);
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unlock_super (sb);
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UFSD("EXIT\n");
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}
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/*
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* Nullify new chunk of inodes,
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* BSD people also set ui_gen field of inode
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* during nullification, but we not care about
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* that because of linux ufs do not support NFS
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*/
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static void ufs2_init_inodes_chunk(struct super_block *sb,
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struct ufs_cg_private_info *ucpi,
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struct ufs_cylinder_group *ucg)
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{
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struct buffer_head *bh;
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struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
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sector_t beg = uspi->s_sbbase +
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ufs_inotofsba(ucpi->c_cgx * uspi->s_ipg +
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fs32_to_cpu(sb, ucg->cg_u.cg_u2.cg_initediblk));
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sector_t end = beg + uspi->s_fpb;
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UFSD("ENTER cgno %d\n", ucpi->c_cgx);
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for (; beg < end; ++beg) {
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bh = sb_getblk(sb, beg);
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lock_buffer(bh);
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memset(bh->b_data, 0, sb->s_blocksize);
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set_buffer_uptodate(bh);
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mark_buffer_dirty(bh);
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unlock_buffer(bh);
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if (sb->s_flags & MS_SYNCHRONOUS)
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sync_dirty_buffer(bh);
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brelse(bh);
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}
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fs32_add(sb, &ucg->cg_u.cg_u2.cg_initediblk, uspi->s_inopb);
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ubh_mark_buffer_dirty(UCPI_UBH(ucpi));
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if (sb->s_flags & MS_SYNCHRONOUS)
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ubh_sync_block(UCPI_UBH(ucpi));
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UFSD("EXIT\n");
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}
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/*
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* There are two policies for allocating an inode. If the new inode is
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* a directory, then a forward search is made for a block group with both
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* free space and a low directory-to-inode ratio; if that fails, then of
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* the groups with above-average free space, that group with the fewest
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* directories already is chosen.
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*
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* For other inodes, search forward from the parent directory's block
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* group to find a free inode.
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*/
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struct inode *ufs_new_inode(struct inode *dir, umode_t mode)
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{
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struct super_block * sb;
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struct ufs_sb_info * sbi;
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struct ufs_sb_private_info * uspi;
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struct ufs_super_block_first * usb1;
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struct ufs_cg_private_info * ucpi;
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struct ufs_cylinder_group * ucg;
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struct inode * inode;
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unsigned cg, bit, i, j, start;
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struct ufs_inode_info *ufsi;
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int err = -ENOSPC;
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UFSD("ENTER\n");
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/* Cannot create files in a deleted directory */
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if (!dir || !dir->i_nlink)
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return ERR_PTR(-EPERM);
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sb = dir->i_sb;
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inode = new_inode(sb);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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ufsi = UFS_I(inode);
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sbi = UFS_SB(sb);
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uspi = sbi->s_uspi;
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usb1 = ubh_get_usb_first(uspi);
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lock_super (sb);
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/*
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* Try to place the inode in its parent directory
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*/
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i = ufs_inotocg(dir->i_ino);
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if (sbi->fs_cs(i).cs_nifree) {
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cg = i;
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goto cg_found;
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}
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/*
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* Use a quadratic hash to find a group with a free inode
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*/
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for ( j = 1; j < uspi->s_ncg; j <<= 1 ) {
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i += j;
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if (i >= uspi->s_ncg)
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i -= uspi->s_ncg;
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if (sbi->fs_cs(i).cs_nifree) {
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cg = i;
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goto cg_found;
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}
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}
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/*
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* That failed: try linear search for a free inode
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*/
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i = ufs_inotocg(dir->i_ino) + 1;
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for (j = 2; j < uspi->s_ncg; j++) {
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i++;
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if (i >= uspi->s_ncg)
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i = 0;
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if (sbi->fs_cs(i).cs_nifree) {
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cg = i;
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goto cg_found;
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}
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}
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goto failed;
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cg_found:
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ucpi = ufs_load_cylinder (sb, cg);
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if (!ucpi) {
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err = -EIO;
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goto failed;
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}
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ucg = ubh_get_ucg(UCPI_UBH(ucpi));
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if (!ufs_cg_chkmagic(sb, ucg))
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ufs_panic (sb, "ufs_new_inode", "internal error, bad cg magic number");
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start = ucpi->c_irotor;
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bit = ubh_find_next_zero_bit (UCPI_UBH(ucpi), ucpi->c_iusedoff, uspi->s_ipg, start);
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if (!(bit < uspi->s_ipg)) {
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bit = ubh_find_first_zero_bit (UCPI_UBH(ucpi), ucpi->c_iusedoff, start);
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if (!(bit < start)) {
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ufs_error (sb, "ufs_new_inode",
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"cylinder group %u corrupted - error in inode bitmap\n", cg);
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err = -EIO;
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goto failed;
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}
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}
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UFSD("start = %u, bit = %u, ipg = %u\n", start, bit, uspi->s_ipg);
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if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit))
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ubh_setbit (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit);
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else {
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ufs_panic (sb, "ufs_new_inode", "internal error");
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err = -EIO;
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goto failed;
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}
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if (uspi->fs_magic == UFS2_MAGIC) {
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u32 initediblk = fs32_to_cpu(sb, ucg->cg_u.cg_u2.cg_initediblk);
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if (bit + uspi->s_inopb > initediblk &&
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initediblk < fs32_to_cpu(sb, ucg->cg_u.cg_u2.cg_niblk))
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ufs2_init_inodes_chunk(sb, ucpi, ucg);
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}
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fs32_sub(sb, &ucg->cg_cs.cs_nifree, 1);
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uspi->cs_total.cs_nifree--;
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fs32_sub(sb, &sbi->fs_cs(cg).cs_nifree, 1);
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if (S_ISDIR(mode)) {
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fs32_add(sb, &ucg->cg_cs.cs_ndir, 1);
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uspi->cs_total.cs_ndir++;
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fs32_add(sb, &sbi->fs_cs(cg).cs_ndir, 1);
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}
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ubh_mark_buffer_dirty (USPI_UBH(uspi));
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ubh_mark_buffer_dirty (UCPI_UBH(ucpi));
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if (sb->s_flags & MS_SYNCHRONOUS)
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ubh_sync_block(UCPI_UBH(ucpi));
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ufs_mark_sb_dirty(sb);
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inode->i_ino = cg * uspi->s_ipg + bit;
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inode_init_owner(inode, dir, mode);
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inode->i_blocks = 0;
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inode->i_generation = 0;
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inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
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ufsi->i_flags = UFS_I(dir)->i_flags;
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ufsi->i_lastfrag = 0;
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ufsi->i_shadow = 0;
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ufsi->i_osync = 0;
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ufsi->i_oeftflag = 0;
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ufsi->i_dir_start_lookup = 0;
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memset(&ufsi->i_u1, 0, sizeof(ufsi->i_u1));
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insert_inode_hash(inode);
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mark_inode_dirty(inode);
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if (uspi->fs_magic == UFS2_MAGIC) {
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struct buffer_head *bh;
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struct ufs2_inode *ufs2_inode;
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/*
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* setup birth date, we do it here because of there is no sense
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* to hold it in struct ufs_inode_info, and lose 64 bit
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*/
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bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
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if (!bh) {
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ufs_warning(sb, "ufs_read_inode",
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"unable to read inode %lu\n",
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inode->i_ino);
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err = -EIO;
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goto fail_remove_inode;
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}
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lock_buffer(bh);
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ufs2_inode = (struct ufs2_inode *)bh->b_data;
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ufs2_inode += ufs_inotofsbo(inode->i_ino);
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ufs2_inode->ui_birthtime = cpu_to_fs64(sb, CURRENT_TIME.tv_sec);
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ufs2_inode->ui_birthnsec = cpu_to_fs32(sb, CURRENT_TIME.tv_nsec);
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mark_buffer_dirty(bh);
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unlock_buffer(bh);
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if (sb->s_flags & MS_SYNCHRONOUS)
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sync_dirty_buffer(bh);
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brelse(bh);
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}
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unlock_super (sb);
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UFSD("allocating inode %lu\n", inode->i_ino);
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UFSD("EXIT\n");
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return inode;
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fail_remove_inode:
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unlock_super(sb);
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clear_nlink(inode);
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iput(inode);
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UFSD("EXIT (FAILED): err %d\n", err);
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return ERR_PTR(err);
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failed:
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unlock_super (sb);
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make_bad_inode(inode);
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iput (inode);
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UFSD("EXIT (FAILED): err %d\n", err);
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return ERR_PTR(err);
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}
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