feaa7bba02
This patch fixes the way we have been dealing with unlinked, but still open files. It removes all limits (other than memory for inodes, as per every other filesystem) on numbers of these which we can support on GFS2. It also means that (like other fs) its the responsibility of the last process to close the file to deallocate the storage, rather than the person who did the unlinking. Note that with GFS2, those two events might take place on different nodes. Also there are a number of other changes: o We use the Linux inode subsystem as it was intended to be used, wrt allocating GFS2 inodes o The Linux inode cache is now the point which we use for local enforcement of only holding one copy of the inode in core at once (previous to this we used the glock layer). o We no longer use the unlinked "special" file. We just ignore it completely. This makes unlinking more efficient. o We now use the 4th block allocation state. The previously unused state is used to track unlinked but still open inodes. o gfs2_inoded is no longer needed o Several fields are now no longer needed (and removed) from the in core struct gfs2_inode o Several fields are no longer needed (and removed) from the in core superblock There are a number of future possible optimisations and clean ups which have been made possible by this patch. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
305 lines
9 KiB
C
305 lines
9 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include "gfs2.h"
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#include <linux/gfs2_ondisk.h>
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#define pv(struct, member, fmt) printk(KERN_INFO " "#member" = "fmt"\n", \
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struct->member);
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/*
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* gfs2_xxx_in - read in an xxx struct
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* first arg: the cpu-order structure
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* buf: the disk-order buffer
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*
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* gfs2_xxx_out - write out an xxx struct
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* first arg: the cpu-order structure
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* buf: the disk-order buffer
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*
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* gfs2_xxx_print - print out an xxx struct
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* first arg: the cpu-order structure
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*/
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void gfs2_inum_in(struct gfs2_inum *no, char *buf)
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{
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struct gfs2_inum *str = (struct gfs2_inum *)buf;
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no->no_formal_ino = be64_to_cpu(str->no_formal_ino);
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no->no_addr = be64_to_cpu(str->no_addr);
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}
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void gfs2_inum_out(const struct gfs2_inum *no, char *buf)
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{
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struct gfs2_inum *str = (struct gfs2_inum *)buf;
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str->no_formal_ino = cpu_to_be64(no->no_formal_ino);
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str->no_addr = cpu_to_be64(no->no_addr);
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}
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static void gfs2_inum_print(struct gfs2_inum *no)
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{
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printk(KERN_INFO " no_formal_ino = %llu\n", (unsigned long long)no->no_formal_ino);
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printk(KERN_INFO " no_addr = %llu\n", (unsigned long long)no->no_addr);
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}
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static void gfs2_meta_header_in(struct gfs2_meta_header *mh, char *buf)
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{
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struct gfs2_meta_header *str = (struct gfs2_meta_header *)buf;
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mh->mh_magic = be32_to_cpu(str->mh_magic);
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mh->mh_type = be32_to_cpu(str->mh_type);
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mh->mh_format = be32_to_cpu(str->mh_format);
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}
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static void gfs2_meta_header_out(struct gfs2_meta_header *mh, char *buf)
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{
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struct gfs2_meta_header *str = (struct gfs2_meta_header *)buf;
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str->mh_magic = cpu_to_be32(mh->mh_magic);
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str->mh_type = cpu_to_be32(mh->mh_type);
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str->mh_format = cpu_to_be32(mh->mh_format);
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}
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static void gfs2_meta_header_print(struct gfs2_meta_header *mh)
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{
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pv(mh, mh_magic, "0x%.8X");
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pv(mh, mh_type, "%u");
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pv(mh, mh_format, "%u");
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}
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void gfs2_sb_in(struct gfs2_sb *sb, char *buf)
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{
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struct gfs2_sb *str = (struct gfs2_sb *)buf;
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gfs2_meta_header_in(&sb->sb_header, buf);
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sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
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sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
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sb->sb_bsize = be32_to_cpu(str->sb_bsize);
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sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
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gfs2_inum_in(&sb->sb_master_dir, (char *)&str->sb_master_dir);
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gfs2_inum_in(&sb->sb_root_dir, (char *)&str->sb_root_dir);
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memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
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memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
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}
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void gfs2_rindex_in(struct gfs2_rindex *ri, char *buf)
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{
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struct gfs2_rindex *str = (struct gfs2_rindex *)buf;
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ri->ri_addr = be64_to_cpu(str->ri_addr);
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ri->ri_length = be32_to_cpu(str->ri_length);
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ri->ri_data0 = be64_to_cpu(str->ri_data0);
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ri->ri_data = be32_to_cpu(str->ri_data);
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ri->ri_bitbytes = be32_to_cpu(str->ri_bitbytes);
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}
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void gfs2_rindex_print(struct gfs2_rindex *ri)
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{
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printk(KERN_INFO " ri_addr = %llu\n", (unsigned long long)ri->ri_addr);
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pv(ri, ri_length, "%u");
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printk(KERN_INFO " ri_data0 = %llu\n", (unsigned long long)ri->ri_data0);
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pv(ri, ri_data, "%u");
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pv(ri, ri_bitbytes, "%u");
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}
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void gfs2_rgrp_in(struct gfs2_rgrp *rg, char *buf)
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{
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struct gfs2_rgrp *str = (struct gfs2_rgrp *)buf;
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gfs2_meta_header_in(&rg->rg_header, buf);
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rg->rg_flags = be32_to_cpu(str->rg_flags);
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rg->rg_free = be32_to_cpu(str->rg_free);
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rg->rg_dinodes = be32_to_cpu(str->rg_dinodes);
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}
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void gfs2_rgrp_out(struct gfs2_rgrp *rg, char *buf)
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{
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struct gfs2_rgrp *str = (struct gfs2_rgrp *)buf;
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gfs2_meta_header_out(&rg->rg_header, buf);
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str->rg_flags = cpu_to_be32(rg->rg_flags);
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str->rg_free = cpu_to_be32(rg->rg_free);
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str->rg_dinodes = cpu_to_be32(rg->rg_dinodes);
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memset(&str->rg_reserved, 0, sizeof(str->rg_reserved));
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}
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void gfs2_quota_in(struct gfs2_quota *qu, char *buf)
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{
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struct gfs2_quota *str = (struct gfs2_quota *)buf;
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qu->qu_limit = be64_to_cpu(str->qu_limit);
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qu->qu_warn = be64_to_cpu(str->qu_warn);
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qu->qu_value = be64_to_cpu(str->qu_value);
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}
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void gfs2_dinode_in(struct gfs2_dinode *di, char *buf)
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{
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struct gfs2_dinode *str = (struct gfs2_dinode *)buf;
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gfs2_meta_header_in(&di->di_header, buf);
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gfs2_inum_in(&di->di_num, (char *)&str->di_num);
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di->di_mode = be32_to_cpu(str->di_mode);
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di->di_uid = be32_to_cpu(str->di_uid);
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di->di_gid = be32_to_cpu(str->di_gid);
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di->di_nlink = be32_to_cpu(str->di_nlink);
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di->di_size = be64_to_cpu(str->di_size);
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di->di_blocks = be64_to_cpu(str->di_blocks);
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di->di_atime = be64_to_cpu(str->di_atime);
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di->di_mtime = be64_to_cpu(str->di_mtime);
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di->di_ctime = be64_to_cpu(str->di_ctime);
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di->di_major = be32_to_cpu(str->di_major);
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di->di_minor = be32_to_cpu(str->di_minor);
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di->di_goal_meta = be64_to_cpu(str->di_goal_meta);
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di->di_goal_data = be64_to_cpu(str->di_goal_data);
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di->di_flags = be32_to_cpu(str->di_flags);
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di->di_payload_format = be32_to_cpu(str->di_payload_format);
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di->di_height = be16_to_cpu(str->di_height);
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di->di_depth = be16_to_cpu(str->di_depth);
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di->di_entries = be32_to_cpu(str->di_entries);
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di->di_eattr = be64_to_cpu(str->di_eattr);
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}
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void gfs2_dinode_out(struct gfs2_dinode *di, char *buf)
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{
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struct gfs2_dinode *str = (struct gfs2_dinode *)buf;
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gfs2_meta_header_out(&di->di_header, buf);
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gfs2_inum_out(&di->di_num, (char *)&str->di_num);
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str->di_mode = cpu_to_be32(di->di_mode);
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str->di_uid = cpu_to_be32(di->di_uid);
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str->di_gid = cpu_to_be32(di->di_gid);
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str->di_nlink = cpu_to_be32(di->di_nlink);
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str->di_size = cpu_to_be64(di->di_size);
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str->di_blocks = cpu_to_be64(di->di_blocks);
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str->di_atime = cpu_to_be64(di->di_atime);
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str->di_mtime = cpu_to_be64(di->di_mtime);
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str->di_ctime = cpu_to_be64(di->di_ctime);
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str->di_major = cpu_to_be32(di->di_major);
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str->di_minor = cpu_to_be32(di->di_minor);
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str->di_goal_meta = cpu_to_be64(di->di_goal_meta);
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str->di_goal_data = cpu_to_be64(di->di_goal_data);
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str->di_flags = cpu_to_be32(di->di_flags);
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str->di_payload_format = cpu_to_be32(di->di_payload_format);
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str->di_height = cpu_to_be16(di->di_height);
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str->di_depth = cpu_to_be16(di->di_depth);
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str->di_entries = cpu_to_be32(di->di_entries);
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str->di_eattr = cpu_to_be64(di->di_eattr);
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}
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void gfs2_dinode_print(struct gfs2_dinode *di)
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{
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gfs2_meta_header_print(&di->di_header);
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gfs2_inum_print(&di->di_num);
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pv(di, di_mode, "0%o");
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pv(di, di_uid, "%u");
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pv(di, di_gid, "%u");
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pv(di, di_nlink, "%u");
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printk(KERN_INFO " di_size = %llu\n", (unsigned long long)di->di_size);
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printk(KERN_INFO " di_blocks = %llu\n", (unsigned long long)di->di_blocks);
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printk(KERN_INFO " di_atime = %lld\n", (long long)di->di_atime);
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printk(KERN_INFO " di_mtime = %lld\n", (long long)di->di_mtime);
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printk(KERN_INFO " di_ctime = %lld\n", (long long)di->di_ctime);
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pv(di, di_major, "%u");
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pv(di, di_minor, "%u");
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printk(KERN_INFO " di_goal_meta = %llu\n", (unsigned long long)di->di_goal_meta);
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printk(KERN_INFO " di_goal_data = %llu\n", (unsigned long long)di->di_goal_data);
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pv(di, di_flags, "0x%.8X");
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pv(di, di_payload_format, "%u");
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pv(di, di_height, "%u");
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pv(di, di_depth, "%u");
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pv(di, di_entries, "%u");
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printk(KERN_INFO " di_eattr = %llu\n", (unsigned long long)di->di_eattr);
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}
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void gfs2_log_header_in(struct gfs2_log_header *lh, char *buf)
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{
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struct gfs2_log_header *str = (struct gfs2_log_header *)buf;
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gfs2_meta_header_in(&lh->lh_header, buf);
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lh->lh_sequence = be64_to_cpu(str->lh_sequence);
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lh->lh_flags = be32_to_cpu(str->lh_flags);
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lh->lh_tail = be32_to_cpu(str->lh_tail);
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lh->lh_blkno = be32_to_cpu(str->lh_blkno);
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lh->lh_hash = be32_to_cpu(str->lh_hash);
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}
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void gfs2_inum_range_in(struct gfs2_inum_range *ir, char *buf)
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{
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struct gfs2_inum_range *str = (struct gfs2_inum_range *)buf;
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ir->ir_start = be64_to_cpu(str->ir_start);
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ir->ir_length = be64_to_cpu(str->ir_length);
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}
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void gfs2_inum_range_out(struct gfs2_inum_range *ir, char *buf)
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{
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struct gfs2_inum_range *str = (struct gfs2_inum_range *)buf;
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str->ir_start = cpu_to_be64(ir->ir_start);
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str->ir_length = cpu_to_be64(ir->ir_length);
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}
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void gfs2_statfs_change_in(struct gfs2_statfs_change *sc, char *buf)
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{
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struct gfs2_statfs_change *str = (struct gfs2_statfs_change *)buf;
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sc->sc_total = be64_to_cpu(str->sc_total);
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sc->sc_free = be64_to_cpu(str->sc_free);
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sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
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}
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void gfs2_statfs_change_out(struct gfs2_statfs_change *sc, char *buf)
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{
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struct gfs2_statfs_change *str = (struct gfs2_statfs_change *)buf;
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str->sc_total = cpu_to_be64(sc->sc_total);
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str->sc_free = cpu_to_be64(sc->sc_free);
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str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
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}
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void gfs2_quota_change_in(struct gfs2_quota_change *qc, char *buf)
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{
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struct gfs2_quota_change *str = (struct gfs2_quota_change *)buf;
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qc->qc_change = be64_to_cpu(str->qc_change);
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qc->qc_flags = be32_to_cpu(str->qc_flags);
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qc->qc_id = be32_to_cpu(str->qc_id);
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}
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