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![Vladimir Davydov](/assets/img/avatar_default.png)
Mark those kmem allocations that are known to be easily triggered from userspace as __GFP_ACCOUNT/SLAB_ACCOUNT, which makes them accounted to memcg. For the list, see below: - threadinfo - task_struct - task_delay_info - pid - cred - mm_struct - vm_area_struct and vm_region (nommu) - anon_vma and anon_vma_chain - signal_struct - sighand_struct - fs_struct - files_struct - fdtable and fdtable->full_fds_bits - dentry and external_name - inode for all filesystems. This is the most tedious part, because most filesystems overwrite the alloc_inode method. The list is far from complete, so feel free to add more objects. Nevertheless, it should be close to "account everything" approach and keep most workloads within bounds. Malevolent users will be able to breach the limit, but this was possible even with the former "account everything" approach (simply because it did not account everything in fact). [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Tejun Heo <tj@kernel.org> Cc: Greg Thelen <gthelen@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
499 lines
12 KiB
C
499 lines
12 KiB
C
/*
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* fs/bfs/inode.c
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* BFS superblock and inode operations.
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* Copyright (C) 1999-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
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* From fs/minix, Copyright (C) 1991, 1992 Linus Torvalds.
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*
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* Made endianness-clean by Andrew Stribblehill <ads@wompom.org>, 2005.
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*/
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/buffer_head.h>
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#include <linux/vfs.h>
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#include <linux/writeback.h>
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#include <linux/uio.h>
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#include <asm/uaccess.h>
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#include "bfs.h"
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MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
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MODULE_DESCRIPTION("SCO UnixWare BFS filesystem for Linux");
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MODULE_LICENSE("GPL");
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#undef DEBUG
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#ifdef DEBUG
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#define dprintf(x...) printf(x)
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#else
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#define dprintf(x...)
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#endif
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struct inode *bfs_iget(struct super_block *sb, unsigned long ino)
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{
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struct bfs_inode *di;
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struct inode *inode;
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struct buffer_head *bh;
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int block, off;
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inode = iget_locked(sb, ino);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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if (!(inode->i_state & I_NEW))
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return inode;
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if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(inode->i_sb)->si_lasti)) {
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printf("Bad inode number %s:%08lx\n", inode->i_sb->s_id, ino);
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goto error;
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}
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block = (ino - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
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bh = sb_bread(inode->i_sb, block);
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if (!bh) {
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printf("Unable to read inode %s:%08lx\n", inode->i_sb->s_id,
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ino);
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goto error;
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}
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off = (ino - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
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di = (struct bfs_inode *)bh->b_data + off;
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inode->i_mode = 0x0000FFFF & le32_to_cpu(di->i_mode);
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if (le32_to_cpu(di->i_vtype) == BFS_VDIR) {
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inode->i_mode |= S_IFDIR;
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inode->i_op = &bfs_dir_inops;
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inode->i_fop = &bfs_dir_operations;
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} else if (le32_to_cpu(di->i_vtype) == BFS_VREG) {
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inode->i_mode |= S_IFREG;
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inode->i_op = &bfs_file_inops;
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inode->i_fop = &bfs_file_operations;
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inode->i_mapping->a_ops = &bfs_aops;
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}
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BFS_I(inode)->i_sblock = le32_to_cpu(di->i_sblock);
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BFS_I(inode)->i_eblock = le32_to_cpu(di->i_eblock);
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BFS_I(inode)->i_dsk_ino = le16_to_cpu(di->i_ino);
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i_uid_write(inode, le32_to_cpu(di->i_uid));
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i_gid_write(inode, le32_to_cpu(di->i_gid));
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set_nlink(inode, le32_to_cpu(di->i_nlink));
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inode->i_size = BFS_FILESIZE(di);
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inode->i_blocks = BFS_FILEBLOCKS(di);
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inode->i_atime.tv_sec = le32_to_cpu(di->i_atime);
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inode->i_mtime.tv_sec = le32_to_cpu(di->i_mtime);
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inode->i_ctime.tv_sec = le32_to_cpu(di->i_ctime);
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inode->i_atime.tv_nsec = 0;
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inode->i_mtime.tv_nsec = 0;
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inode->i_ctime.tv_nsec = 0;
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brelse(bh);
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unlock_new_inode(inode);
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return inode;
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error:
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iget_failed(inode);
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return ERR_PTR(-EIO);
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}
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static struct bfs_inode *find_inode(struct super_block *sb, u16 ino, struct buffer_head **p)
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{
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if ((ino < BFS_ROOT_INO) || (ino > BFS_SB(sb)->si_lasti)) {
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printf("Bad inode number %s:%08x\n", sb->s_id, ino);
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return ERR_PTR(-EIO);
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}
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ino -= BFS_ROOT_INO;
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*p = sb_bread(sb, 1 + ino / BFS_INODES_PER_BLOCK);
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if (!*p) {
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printf("Unable to read inode %s:%08x\n", sb->s_id, ino);
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return ERR_PTR(-EIO);
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}
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return (struct bfs_inode *)(*p)->b_data + ino % BFS_INODES_PER_BLOCK;
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}
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static int bfs_write_inode(struct inode *inode, struct writeback_control *wbc)
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{
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struct bfs_sb_info *info = BFS_SB(inode->i_sb);
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unsigned int ino = (u16)inode->i_ino;
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unsigned long i_sblock;
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struct bfs_inode *di;
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struct buffer_head *bh;
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int err = 0;
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dprintf("ino=%08x\n", ino);
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di = find_inode(inode->i_sb, ino, &bh);
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if (IS_ERR(di))
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return PTR_ERR(di);
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mutex_lock(&info->bfs_lock);
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if (ino == BFS_ROOT_INO)
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di->i_vtype = cpu_to_le32(BFS_VDIR);
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else
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di->i_vtype = cpu_to_le32(BFS_VREG);
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di->i_ino = cpu_to_le16(ino);
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di->i_mode = cpu_to_le32(inode->i_mode);
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di->i_uid = cpu_to_le32(i_uid_read(inode));
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di->i_gid = cpu_to_le32(i_gid_read(inode));
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di->i_nlink = cpu_to_le32(inode->i_nlink);
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di->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
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di->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
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di->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
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i_sblock = BFS_I(inode)->i_sblock;
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di->i_sblock = cpu_to_le32(i_sblock);
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di->i_eblock = cpu_to_le32(BFS_I(inode)->i_eblock);
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di->i_eoffset = cpu_to_le32(i_sblock * BFS_BSIZE + inode->i_size - 1);
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mark_buffer_dirty(bh);
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if (wbc->sync_mode == WB_SYNC_ALL) {
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sync_dirty_buffer(bh);
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if (buffer_req(bh) && !buffer_uptodate(bh))
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err = -EIO;
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}
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brelse(bh);
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mutex_unlock(&info->bfs_lock);
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return err;
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}
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static void bfs_evict_inode(struct inode *inode)
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{
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unsigned long ino = inode->i_ino;
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struct bfs_inode *di;
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struct buffer_head *bh;
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struct super_block *s = inode->i_sb;
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struct bfs_sb_info *info = BFS_SB(s);
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struct bfs_inode_info *bi = BFS_I(inode);
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dprintf("ino=%08lx\n", ino);
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truncate_inode_pages_final(&inode->i_data);
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invalidate_inode_buffers(inode);
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clear_inode(inode);
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if (inode->i_nlink)
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return;
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di = find_inode(s, inode->i_ino, &bh);
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if (IS_ERR(di))
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return;
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mutex_lock(&info->bfs_lock);
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/* clear on-disk inode */
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memset(di, 0, sizeof(struct bfs_inode));
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mark_buffer_dirty(bh);
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brelse(bh);
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if (bi->i_dsk_ino) {
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if (bi->i_sblock)
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info->si_freeb += bi->i_eblock + 1 - bi->i_sblock;
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info->si_freei++;
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clear_bit(ino, info->si_imap);
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bfs_dump_imap("delete_inode", s);
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}
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/*
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* If this was the last file, make the previous block
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* "last block of the last file" even if there is no
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* real file there, saves us 1 gap.
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*/
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if (info->si_lf_eblk == bi->i_eblock)
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info->si_lf_eblk = bi->i_sblock - 1;
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mutex_unlock(&info->bfs_lock);
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}
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static void bfs_put_super(struct super_block *s)
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{
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struct bfs_sb_info *info = BFS_SB(s);
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if (!info)
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return;
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mutex_destroy(&info->bfs_lock);
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kfree(info->si_imap);
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kfree(info);
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s->s_fs_info = NULL;
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}
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static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct super_block *s = dentry->d_sb;
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struct bfs_sb_info *info = BFS_SB(s);
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u64 id = huge_encode_dev(s->s_bdev->bd_dev);
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buf->f_type = BFS_MAGIC;
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buf->f_bsize = s->s_blocksize;
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buf->f_blocks = info->si_blocks;
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buf->f_bfree = buf->f_bavail = info->si_freeb;
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buf->f_files = info->si_lasti + 1 - BFS_ROOT_INO;
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buf->f_ffree = info->si_freei;
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buf->f_fsid.val[0] = (u32)id;
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buf->f_fsid.val[1] = (u32)(id >> 32);
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buf->f_namelen = BFS_NAMELEN;
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return 0;
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}
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static struct kmem_cache *bfs_inode_cachep;
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static struct inode *bfs_alloc_inode(struct super_block *sb)
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{
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struct bfs_inode_info *bi;
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bi = kmem_cache_alloc(bfs_inode_cachep, GFP_KERNEL);
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if (!bi)
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return NULL;
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return &bi->vfs_inode;
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}
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static void bfs_i_callback(struct rcu_head *head)
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{
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struct inode *inode = container_of(head, struct inode, i_rcu);
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kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
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}
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static void bfs_destroy_inode(struct inode *inode)
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{
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call_rcu(&inode->i_rcu, bfs_i_callback);
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}
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static void init_once(void *foo)
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{
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struct bfs_inode_info *bi = foo;
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inode_init_once(&bi->vfs_inode);
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}
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static int __init init_inodecache(void)
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{
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bfs_inode_cachep = kmem_cache_create("bfs_inode_cache",
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sizeof(struct bfs_inode_info),
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0, (SLAB_RECLAIM_ACCOUNT|
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SLAB_MEM_SPREAD|SLAB_ACCOUNT),
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init_once);
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if (bfs_inode_cachep == NULL)
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return -ENOMEM;
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return 0;
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}
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static void destroy_inodecache(void)
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{
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/*
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* Make sure all delayed rcu free inodes are flushed before we
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* destroy cache.
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*/
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rcu_barrier();
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kmem_cache_destroy(bfs_inode_cachep);
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}
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static const struct super_operations bfs_sops = {
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.alloc_inode = bfs_alloc_inode,
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.destroy_inode = bfs_destroy_inode,
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.write_inode = bfs_write_inode,
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.evict_inode = bfs_evict_inode,
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.put_super = bfs_put_super,
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.statfs = bfs_statfs,
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};
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void bfs_dump_imap(const char *prefix, struct super_block *s)
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{
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#ifdef DEBUG
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int i;
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char *tmpbuf = (char *)get_zeroed_page(GFP_KERNEL);
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if (!tmpbuf)
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return;
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for (i = BFS_SB(s)->si_lasti; i >= 0; i--) {
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if (i > PAGE_SIZE - 100) break;
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if (test_bit(i, BFS_SB(s)->si_imap))
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strcat(tmpbuf, "1");
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else
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strcat(tmpbuf, "0");
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}
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printf("BFS-fs: %s: lasti=%08lx <%s>\n",
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prefix, BFS_SB(s)->si_lasti, tmpbuf);
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free_page((unsigned long)tmpbuf);
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#endif
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}
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static int bfs_fill_super(struct super_block *s, void *data, int silent)
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{
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struct buffer_head *bh, *sbh;
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struct bfs_super_block *bfs_sb;
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struct inode *inode;
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unsigned i, imap_len;
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struct bfs_sb_info *info;
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int ret = -EINVAL;
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unsigned long i_sblock, i_eblock, i_eoff, s_size;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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mutex_init(&info->bfs_lock);
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s->s_fs_info = info;
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sb_set_blocksize(s, BFS_BSIZE);
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sbh = sb_bread(s, 0);
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if (!sbh)
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goto out;
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bfs_sb = (struct bfs_super_block *)sbh->b_data;
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if (le32_to_cpu(bfs_sb->s_magic) != BFS_MAGIC) {
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if (!silent)
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printf("No BFS filesystem on %s (magic=%08x)\n",
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s->s_id, le32_to_cpu(bfs_sb->s_magic));
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goto out1;
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}
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if (BFS_UNCLEAN(bfs_sb, s) && !silent)
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printf("%s is unclean, continuing\n", s->s_id);
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s->s_magic = BFS_MAGIC;
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if (le32_to_cpu(bfs_sb->s_start) > le32_to_cpu(bfs_sb->s_end)) {
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printf("Superblock is corrupted\n");
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goto out1;
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}
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info->si_lasti = (le32_to_cpu(bfs_sb->s_start) - BFS_BSIZE) /
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sizeof(struct bfs_inode)
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+ BFS_ROOT_INO - 1;
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imap_len = (info->si_lasti / 8) + 1;
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info->si_imap = kzalloc(imap_len, GFP_KERNEL);
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if (!info->si_imap)
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goto out1;
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for (i = 0; i < BFS_ROOT_INO; i++)
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set_bit(i, info->si_imap);
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s->s_op = &bfs_sops;
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inode = bfs_iget(s, BFS_ROOT_INO);
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if (IS_ERR(inode)) {
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ret = PTR_ERR(inode);
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goto out2;
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}
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s->s_root = d_make_root(inode);
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if (!s->s_root) {
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ret = -ENOMEM;
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goto out2;
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}
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info->si_blocks = (le32_to_cpu(bfs_sb->s_end) + 1) >> BFS_BSIZE_BITS;
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info->si_freeb = (le32_to_cpu(bfs_sb->s_end) + 1
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- le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
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info->si_freei = 0;
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info->si_lf_eblk = 0;
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/* can we read the last block? */
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bh = sb_bread(s, info->si_blocks - 1);
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if (!bh) {
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printf("Last block not available: %lu\n", info->si_blocks - 1);
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ret = -EIO;
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goto out3;
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}
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brelse(bh);
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bh = NULL;
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for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
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struct bfs_inode *di;
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int block = (i - BFS_ROOT_INO) / BFS_INODES_PER_BLOCK + 1;
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int off = (i - BFS_ROOT_INO) % BFS_INODES_PER_BLOCK;
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unsigned long eblock;
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if (!off) {
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brelse(bh);
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bh = sb_bread(s, block);
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}
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if (!bh)
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continue;
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di = (struct bfs_inode *)bh->b_data + off;
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/* test if filesystem is not corrupted */
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i_eoff = le32_to_cpu(di->i_eoffset);
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i_sblock = le32_to_cpu(di->i_sblock);
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i_eblock = le32_to_cpu(di->i_eblock);
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s_size = le32_to_cpu(bfs_sb->s_end);
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if (i_sblock > info->si_blocks ||
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i_eblock > info->si_blocks ||
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i_sblock > i_eblock ||
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i_eoff > s_size ||
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i_sblock * BFS_BSIZE > i_eoff) {
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printf("Inode 0x%08x corrupted\n", i);
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brelse(bh);
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ret = -EIO;
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goto out3;
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}
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if (!di->i_ino) {
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info->si_freei++;
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continue;
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}
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set_bit(i, info->si_imap);
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info->si_freeb -= BFS_FILEBLOCKS(di);
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eblock = le32_to_cpu(di->i_eblock);
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if (eblock > info->si_lf_eblk)
|
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info->si_lf_eblk = eblock;
|
|
}
|
|
brelse(bh);
|
|
brelse(sbh);
|
|
bfs_dump_imap("read_super", s);
|
|
return 0;
|
|
|
|
out3:
|
|
dput(s->s_root);
|
|
s->s_root = NULL;
|
|
out2:
|
|
kfree(info->si_imap);
|
|
out1:
|
|
brelse(sbh);
|
|
out:
|
|
mutex_destroy(&info->bfs_lock);
|
|
kfree(info);
|
|
s->s_fs_info = NULL;
|
|
return ret;
|
|
}
|
|
|
|
static struct dentry *bfs_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_bdev(fs_type, flags, dev_name, data, bfs_fill_super);
|
|
}
|
|
|
|
static struct file_system_type bfs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "bfs",
|
|
.mount = bfs_mount,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
MODULE_ALIAS_FS("bfs");
|
|
|
|
static int __init init_bfs_fs(void)
|
|
{
|
|
int err = init_inodecache();
|
|
if (err)
|
|
goto out1;
|
|
err = register_filesystem(&bfs_fs_type);
|
|
if (err)
|
|
goto out;
|
|
return 0;
|
|
out:
|
|
destroy_inodecache();
|
|
out1:
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_bfs_fs(void)
|
|
{
|
|
unregister_filesystem(&bfs_fs_type);
|
|
destroy_inodecache();
|
|
}
|
|
|
|
module_init(init_bfs_fs)
|
|
module_exit(exit_bfs_fs)
|