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fs/nilfs2/the_nilfs.c
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/* * the_nilfs.c - the_nilfs shared structure. * * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * * Written by Ryusuke Konishi <ryusuke@osrg.net> * */ #include <linux/buffer_head.h> #include <linux/slab.h> #include <linux/blkdev.h> #include <linux/backing-dev.h> |
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#include <linux/random.h> |
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#include <linux/crc32.h> |
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#include "nilfs.h" #include "segment.h" #include "alloc.h" #include "cpfile.h" #include "sufile.h" #include "dat.h" |
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#include "segbuf.h" |
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static int nilfs_valid_sb(struct nilfs_super_block *sbp); |
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void nilfs_set_last_segment(struct the_nilfs *nilfs, sector_t start_blocknr, u64 seq, __u64 cno) { spin_lock(&nilfs->ns_last_segment_lock); nilfs->ns_last_pseg = start_blocknr; nilfs->ns_last_seq = seq; nilfs->ns_last_cno = cno; |
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if (!nilfs_sb_dirty(nilfs)) { if (nilfs->ns_prev_seq == nilfs->ns_last_seq) goto stay_cursor; set_nilfs_sb_dirty(nilfs); } nilfs->ns_prev_seq = nilfs->ns_last_seq; stay_cursor: |
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spin_unlock(&nilfs->ns_last_segment_lock); } /** |
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* alloc_nilfs - allocate a nilfs object |
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* @bdev: block device to which the_nilfs is related * |
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* Return Value: On success, pointer to the_nilfs is returned. * On error, NULL is returned. */ |
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struct the_nilfs *alloc_nilfs(struct block_device *bdev) |
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{ struct the_nilfs *nilfs; nilfs = kzalloc(sizeof(*nilfs), GFP_KERNEL); if (!nilfs) return NULL; nilfs->ns_bdev = bdev; |
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atomic_set(&nilfs->ns_ndirtyblks, 0); init_rwsem(&nilfs->ns_sem); |
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mutex_init(&nilfs->ns_snapshot_mount_mutex); |
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INIT_LIST_HEAD(&nilfs->ns_dirty_files); |
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INIT_LIST_HEAD(&nilfs->ns_gc_inodes); |
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spin_lock_init(&nilfs->ns_inode_lock); |
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spin_lock_init(&nilfs->ns_next_gen_lock); |
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spin_lock_init(&nilfs->ns_last_segment_lock); |
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nilfs->ns_cptree = RB_ROOT; spin_lock_init(&nilfs->ns_cptree_lock); |
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init_rwsem(&nilfs->ns_segctor_sem); |
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nilfs->ns_sb_update_freq = NILFS_SB_FREQ; |
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return nilfs; } /** |
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* destroy_nilfs - destroy nilfs object * @nilfs: nilfs object to be released |
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*/ |
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void destroy_nilfs(struct the_nilfs *nilfs) |
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{ |
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might_sleep(); |
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if (nilfs_init(nilfs)) { |
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nilfs_sysfs_delete_device_group(nilfs); |
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brelse(nilfs->ns_sbh[0]); brelse(nilfs->ns_sbh[1]); |
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} kfree(nilfs); } |
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static int nilfs_load_super_root(struct the_nilfs *nilfs, struct super_block *sb, sector_t sr_block) |
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{ struct buffer_head *bh_sr; struct nilfs_super_root *raw_sr; |
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struct nilfs_super_block **sbp = nilfs->ns_sbp; |
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struct nilfs_inode *rawi; |
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unsigned dat_entry_size, segment_usage_size, checkpoint_size; unsigned inode_size; int err; |
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err = nilfs_read_super_root_block(nilfs, sr_block, &bh_sr, 1); |
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if (unlikely(err)) return err; down_read(&nilfs->ns_sem); |
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dat_entry_size = le16_to_cpu(sbp[0]->s_dat_entry_size); checkpoint_size = le16_to_cpu(sbp[0]->s_checkpoint_size); segment_usage_size = le16_to_cpu(sbp[0]->s_segment_usage_size); |
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up_read(&nilfs->ns_sem); inode_size = nilfs->ns_inode_size; |
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rawi = (void *)bh_sr->b_data + NILFS_SR_DAT_OFFSET(inode_size); err = nilfs_dat_read(sb, dat_entry_size, rawi, &nilfs->ns_dat); if (err) |
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goto failed; |
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rawi = (void *)bh_sr->b_data + NILFS_SR_CPFILE_OFFSET(inode_size); err = nilfs_cpfile_read(sb, checkpoint_size, rawi, &nilfs->ns_cpfile); if (err) |
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goto failed_dat; |
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rawi = (void *)bh_sr->b_data + NILFS_SR_SUFILE_OFFSET(inode_size); err = nilfs_sufile_read(sb, segment_usage_size, rawi, &nilfs->ns_sufile); if (err) |
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goto failed_cpfile; |
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raw_sr = (struct nilfs_super_root *)bh_sr->b_data; nilfs->ns_nongc_ctime = le64_to_cpu(raw_sr->sr_nongc_ctime); failed: brelse(bh_sr); return err; |
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failed_cpfile: |
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iput(nilfs->ns_cpfile); |
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failed_dat: |
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iput(nilfs->ns_dat); |
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goto failed; } static void nilfs_init_recovery_info(struct nilfs_recovery_info *ri) { memset(ri, 0, sizeof(*ri)); INIT_LIST_HEAD(&ri->ri_used_segments); } static void nilfs_clear_recovery_info(struct nilfs_recovery_info *ri) { nilfs_dispose_segment_list(&ri->ri_used_segments); } /** |
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* nilfs_store_log_cursor - load log cursor from a super block * @nilfs: nilfs object * @sbp: buffer storing super block to be read * * nilfs_store_log_cursor() reads the last position of the log * containing a super root from a given super block, and initializes * relevant information on the nilfs object preparatory for log * scanning and recovery. */ static int nilfs_store_log_cursor(struct the_nilfs *nilfs, struct nilfs_super_block *sbp) { int ret = 0; nilfs->ns_last_pseg = le64_to_cpu(sbp->s_last_pseg); nilfs->ns_last_cno = le64_to_cpu(sbp->s_last_cno); nilfs->ns_last_seq = le64_to_cpu(sbp->s_last_seq); |
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nilfs->ns_prev_seq = nilfs->ns_last_seq; |
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nilfs->ns_seg_seq = nilfs->ns_last_seq; nilfs->ns_segnum = nilfs_get_segnum_of_block(nilfs, nilfs->ns_last_pseg); nilfs->ns_cno = nilfs->ns_last_cno + 1; if (nilfs->ns_segnum >= nilfs->ns_nsegments) { printk(KERN_ERR "NILFS invalid last segment number. "); ret = -EINVAL; } return ret; } /** |
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* load_nilfs - load and recover the nilfs * @nilfs: the_nilfs structure to be released |
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* @sb: super block isntance used to recover past segment |
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* * load_nilfs() searches and load the latest super root, * attaches the last segment, and does recovery if needed. * The caller must call this exclusively for simultaneous mounts. */ |
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int load_nilfs(struct the_nilfs *nilfs, struct super_block *sb) |
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{ struct nilfs_recovery_info ri; |
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unsigned int s_flags = sb->s_flags; |
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int really_read_only = bdev_read_only(nilfs->ns_bdev); |
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int valid_fs = nilfs_valid_fs(nilfs); |
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int err; |
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if (!valid_fs) { printk(KERN_WARNING "NILFS warning: mounting unchecked fs "); if (s_flags & MS_RDONLY) { printk(KERN_INFO "NILFS: INFO: recovery " "required for readonly filesystem. "); printk(KERN_INFO "NILFS: write access will " "be enabled during recovery. "); |
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} |
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} |
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nilfs_init_recovery_info(&ri); |
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err = nilfs_search_super_root(nilfs, &ri); |
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if (unlikely(err)) { |
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struct nilfs_super_block **sbp = nilfs->ns_sbp; int blocksize; if (err != -EINVAL) goto scan_error; if (!nilfs_valid_sb(sbp[1])) { printk(KERN_WARNING "NILFS warning: unable to fall back to spare" "super block "); goto scan_error; } printk(KERN_INFO "NILFS: try rollback from an earlier position "); /* * restore super block with its spare and reconfigure * relevant states of the nilfs object. */ memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); nilfs->ns_crc_seed = le32_to_cpu(sbp[0]->s_crc_seed); nilfs->ns_sbwtime = le64_to_cpu(sbp[0]->s_wtime); /* verify consistency between two super blocks */ blocksize = BLOCK_SIZE << le32_to_cpu(sbp[0]->s_log_block_size); if (blocksize != nilfs->ns_blocksize) { printk(KERN_WARNING "NILFS warning: blocksize differs between " "two super blocks (%d != %d) ", blocksize, nilfs->ns_blocksize); goto scan_error; } err = nilfs_store_log_cursor(nilfs, sbp[0]); if (err) goto scan_error; /* drop clean flag to allow roll-forward and recovery */ nilfs->ns_mount_state &= ~NILFS_VALID_FS; valid_fs = 0; err = nilfs_search_super_root(nilfs, &ri); if (err) goto scan_error; |
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} |
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err = nilfs_load_super_root(nilfs, sb, ri.ri_super_root); |
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if (unlikely(err)) { printk(KERN_ERR "NILFS: error loading super root. "); goto failed; } |
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if (valid_fs) goto skip_recovery; if (s_flags & MS_RDONLY) { |
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__u64 features; |
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if (nilfs_test_opt(nilfs, NORECOVERY)) { |
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printk(KERN_INFO "NILFS: norecovery option specified. " "skipping roll-forward recovery "); goto skip_recovery; } |
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features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & ~NILFS_FEATURE_COMPAT_RO_SUPP; if (features) { printk(KERN_ERR "NILFS: couldn't proceed with " "recovery because of unsupported optional " "features (%llx) ", (unsigned long long)features); err = -EROFS; goto failed_unload; } |
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if (really_read_only) { printk(KERN_ERR "NILFS: write access " "unavailable, cannot proceed. "); err = -EROFS; goto failed_unload; |
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} |
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sb->s_flags &= ~MS_RDONLY; |
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} else if (nilfs_test_opt(nilfs, NORECOVERY)) { |
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printk(KERN_ERR "NILFS: recovery cancelled because norecovery " "option was specified for a read/write mount "); err = -EINVAL; goto failed_unload; |
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} |
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err = nilfs_salvage_orphan_logs(nilfs, sb, &ri); |
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if (err) goto failed_unload; down_write(&nilfs->ns_sem); |
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nilfs->ns_mount_state |= NILFS_VALID_FS; /* set "clean" flag */ |
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err = nilfs_cleanup_super(sb); |
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up_write(&nilfs->ns_sem); if (err) { printk(KERN_ERR "NILFS: failed to update super block. " "recovery unfinished. "); goto failed_unload; |
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} |
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printk(KERN_INFO "NILFS: recovery complete. "); |
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skip_recovery: |
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nilfs_clear_recovery_info(&ri); |
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sb->s_flags = s_flags; |
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return 0; |
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scan_error: printk(KERN_ERR "NILFS: error searching super root. "); goto failed; |
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failed_unload: |
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iput(nilfs->ns_cpfile); iput(nilfs->ns_sufile); iput(nilfs->ns_dat); |
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failed: nilfs_clear_recovery_info(&ri); |
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sb->s_flags = s_flags; |
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return err; } static unsigned long long nilfs_max_size(unsigned int blkbits) { unsigned int max_bits; unsigned long long res = MAX_LFS_FILESIZE; /* page cache limit */ max_bits = blkbits + NILFS_BMAP_KEY_BIT; /* bmap size limit */ if (max_bits < 64) res = min_t(unsigned long long, res, (1ULL << max_bits) - 1); return res; } |
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/** * nilfs_nrsvsegs - calculate the number of reserved segments * @nilfs: nilfs object * @nsegs: total number of segments */ unsigned long nilfs_nrsvsegs(struct the_nilfs *nilfs, unsigned long nsegs) { return max_t(unsigned long, NILFS_MIN_NRSVSEGS, DIV_ROUND_UP(nsegs * nilfs->ns_r_segments_percentage, 100)); } void nilfs_set_nsegments(struct the_nilfs *nilfs, unsigned long nsegs) { nilfs->ns_nsegments = nsegs; nilfs->ns_nrsvsegs = nilfs_nrsvsegs(nilfs, nsegs); } |
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static int nilfs_store_disk_layout(struct the_nilfs *nilfs, struct nilfs_super_block *sbp) |
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{ |
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if (le32_to_cpu(sbp->s_rev_level) < NILFS_MIN_SUPP_REV) { printk(KERN_ERR "NILFS: unsupported revision " |
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"(superblock rev.=%d.%d, current rev.=%d.%d). " "Please check the version of mkfs.nilfs. ", le32_to_cpu(sbp->s_rev_level), le16_to_cpu(sbp->s_minor_rev_level), NILFS_CURRENT_REV, NILFS_MINOR_REV); return -EINVAL; } |
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nilfs->ns_sbsize = le16_to_cpu(sbp->s_bytes); if (nilfs->ns_sbsize > BLOCK_SIZE) return -EINVAL; |
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nilfs->ns_inode_size = le16_to_cpu(sbp->s_inode_size); |
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if (nilfs->ns_inode_size > nilfs->ns_blocksize) { printk(KERN_ERR "NILFS: too large inode size: %d bytes. ", nilfs->ns_inode_size); return -EINVAL; } else if (nilfs->ns_inode_size < NILFS_MIN_INODE_SIZE) { printk(KERN_ERR "NILFS: too small inode size: %d bytes. ", nilfs->ns_inode_size); return -EINVAL; } |
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nilfs->ns_first_ino = le32_to_cpu(sbp->s_first_ino); nilfs->ns_blocks_per_segment = le32_to_cpu(sbp->s_blocks_per_segment); if (nilfs->ns_blocks_per_segment < NILFS_SEG_MIN_BLOCKS) { |
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printk(KERN_ERR "NILFS: too short segment. "); |
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return -EINVAL; } nilfs->ns_first_data_block = le64_to_cpu(sbp->s_first_data_block); |
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nilfs->ns_r_segments_percentage = le32_to_cpu(sbp->s_r_segments_percentage); |
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if (nilfs->ns_r_segments_percentage < 1 || nilfs->ns_r_segments_percentage > 99) { printk(KERN_ERR "NILFS: invalid reserved segments percentage. "); return -EINVAL; } |
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nilfs_set_nsegments(nilfs, le64_to_cpu(sbp->s_nsegments)); |
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nilfs->ns_crc_seed = le32_to_cpu(sbp->s_crc_seed); return 0; } |
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static int nilfs_valid_sb(struct nilfs_super_block *sbp) { static unsigned char sum[4]; const int sumoff = offsetof(struct nilfs_super_block, s_sum); size_t bytes; u32 crc; if (!sbp || le16_to_cpu(sbp->s_magic) != NILFS_SUPER_MAGIC) return 0; bytes = le16_to_cpu(sbp->s_bytes); if (bytes > BLOCK_SIZE) return 0; crc = crc32_le(le32_to_cpu(sbp->s_crc_seed), (unsigned char *)sbp, sumoff); crc = crc32_le(crc, sum, 4); crc = crc32_le(crc, (unsigned char *)sbp + sumoff + 4, bytes - sumoff - 4); return crc == le32_to_cpu(sbp->s_sum); } static int nilfs_sb2_bad_offset(struct nilfs_super_block *sbp, u64 offset) { return offset < ((le64_to_cpu(sbp->s_nsegments) * le32_to_cpu(sbp->s_blocks_per_segment)) << (le32_to_cpu(sbp->s_log_block_size) + 10)); } static void nilfs_release_super_block(struct the_nilfs *nilfs) { int i; for (i = 0; i < 2; i++) { if (nilfs->ns_sbp[i]) { brelse(nilfs->ns_sbh[i]); nilfs->ns_sbh[i] = NULL; nilfs->ns_sbp[i] = NULL; } } } void nilfs_fall_back_super_block(struct the_nilfs *nilfs) { brelse(nilfs->ns_sbh[0]); nilfs->ns_sbh[0] = nilfs->ns_sbh[1]; nilfs->ns_sbp[0] = nilfs->ns_sbp[1]; nilfs->ns_sbh[1] = NULL; nilfs->ns_sbp[1] = NULL; } void nilfs_swap_super_block(struct the_nilfs *nilfs) { struct buffer_head *tsbh = nilfs->ns_sbh[0]; struct nilfs_super_block *tsbp = nilfs->ns_sbp[0]; nilfs->ns_sbh[0] = nilfs->ns_sbh[1]; nilfs->ns_sbp[0] = nilfs->ns_sbp[1]; nilfs->ns_sbh[1] = tsbh; nilfs->ns_sbp[1] = tsbp; } static int nilfs_load_super_block(struct the_nilfs *nilfs, struct super_block *sb, int blocksize, struct nilfs_super_block **sbpp) { struct nilfs_super_block **sbp = nilfs->ns_sbp; struct buffer_head **sbh = nilfs->ns_sbh; u64 sb2off = NILFS_SB2_OFFSET_BYTES(nilfs->ns_bdev->bd_inode->i_size); int valid[2], swp = 0; sbp[0] = nilfs_read_super_block(sb, NILFS_SB_OFFSET_BYTES, blocksize, &sbh[0]); sbp[1] = nilfs_read_super_block(sb, sb2off, blocksize, &sbh[1]); if (!sbp[0]) { if (!sbp[1]) { printk(KERN_ERR "NILFS: unable to read superblock "); return -EIO; } printk(KERN_WARNING |
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"NILFS warning: unable to read primary superblock " "(blocksize = %d) ", blocksize); } else if (!sbp[1]) { |
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printk(KERN_WARNING |
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"NILFS warning: unable to read secondary superblock " "(blocksize = %d) ", blocksize); } |
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/* * Compare two super blocks and set 1 in swp if the secondary * super block is valid and newer. Otherwise, set 0 in swp. */ |
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valid[0] = nilfs_valid_sb(sbp[0]); valid[1] = nilfs_valid_sb(sbp[1]); |
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swp = valid[1] && (!valid[0] || le64_to_cpu(sbp[1]->s_last_cno) > le64_to_cpu(sbp[0]->s_last_cno)); |
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if (valid[swp] && nilfs_sb2_bad_offset(sbp[swp], sb2off)) { brelse(sbh[1]); sbh[1] = NULL; sbp[1] = NULL; |
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valid[1] = 0; |
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swp = 0; } if (!valid[swp]) { nilfs_release_super_block(nilfs); printk(KERN_ERR "NILFS: Can't find nilfs on dev %s. ", sb->s_id); return -EINVAL; } |
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if (!valid[!swp]) |
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|
547 |
printk(KERN_WARNING "NILFS warning: broken superblock. " |
4138ec238
|
548 549 |
"using spare superblock (blocksize = %d). ", blocksize); |
ea1a16f71
|
550 |
if (swp) |
e339ad31f
|
551 |
nilfs_swap_super_block(nilfs); |
e339ad31f
|
552 |
|
b2ac86e1a
|
553 554 |
nilfs->ns_sbwcount = 0; nilfs->ns_sbwtime = le64_to_cpu(sbp[0]->s_wtime); |
e339ad31f
|
555 556 557 558 |
nilfs->ns_prot_seq = le64_to_cpu(sbp[valid[1] & !swp]->s_last_seq); *sbpp = sbp[0]; return 0; } |
8a9d2191e
|
559 560 561 |
/** * init_nilfs - initialize a NILFS instance. * @nilfs: the_nilfs structure |
8a9d2191e
|
562 563 564 565 566 |
* @sb: super block * @data: mount options * * init_nilfs() performs common initialization per block device (e.g. * reading the super block, getting disk layout information, initializing |
f11459ad7
|
567 |
* shared fields in the_nilfs). |
8a9d2191e
|
568 569 570 571 |
* * Return Value: On success, 0 is returned. On error, a negative error * code is returned. */ |
f7545144c
|
572 |
int init_nilfs(struct the_nilfs *nilfs, struct super_block *sb, char *data) |
8a9d2191e
|
573 |
{ |
8a9d2191e
|
574 |
struct nilfs_super_block *sbp; |
8a9d2191e
|
575 |
int blocksize; |
e339ad31f
|
576 |
int err; |
8a9d2191e
|
577 578 |
down_write(&nilfs->ns_sem); |
8a9d2191e
|
579 |
|
89c0fd014
|
580 |
blocksize = sb_min_blocksize(sb, NILFS_MIN_BLOCK_SIZE); |
e339ad31f
|
581 582 583 |
if (!blocksize) { printk(KERN_ERR "NILFS: unable to set blocksize "); |
8a9d2191e
|
584 585 586 |
err = -EINVAL; goto out; } |
e339ad31f
|
587 588 589 |
err = nilfs_load_super_block(nilfs, sb, blocksize, &sbp); if (err) goto out; |
8a9d2191e
|
590 591 592 |
err = nilfs_store_magic_and_option(sb, sbp, data); if (err) goto failed_sbh; |
c5ca48aab
|
593 594 595 |
err = nilfs_check_feature_compatibility(sb, sbp); if (err) goto failed_sbh; |
8a9d2191e
|
596 |
blocksize = BLOCK_SIZE << le32_to_cpu(sbp->s_log_block_size); |
89c0fd014
|
597 598 599 600 601 602 603 604 |
if (blocksize < NILFS_MIN_BLOCK_SIZE || blocksize > NILFS_MAX_BLOCK_SIZE) { printk(KERN_ERR "NILFS: couldn't mount because of unsupported " "filesystem blocksize %d ", blocksize); err = -EINVAL; goto failed_sbh; } |
8a9d2191e
|
605 |
if (sb->s_blocksize != blocksize) { |
e1defc4ff
|
606 |
int hw_blocksize = bdev_logical_block_size(sb->s_bdev); |
e339ad31f
|
607 608 609 610 611 612 613 |
if (blocksize < hw_blocksize) { printk(KERN_ERR "NILFS: blocksize %d too small for device " "(sector-size = %d). ", blocksize, hw_blocksize); |
8a9d2191e
|
614 |
err = -EINVAL; |
e339ad31f
|
615 616 617 618 619 620 621 |
goto failed_sbh; } nilfs_release_super_block(nilfs); sb_set_blocksize(sb, blocksize); err = nilfs_load_super_block(nilfs, sb, blocksize, &sbp); if (err) |
8a9d2191e
|
622 623 624 |
goto out; /* not failed_sbh; sbh is released automatically when reloading fails. */ |
8a9d2191e
|
625 626 |
} nilfs->ns_blocksize_bits = sb->s_blocksize_bits; |
92c60ccaf
|
627 |
nilfs->ns_blocksize = blocksize; |
8a9d2191e
|
628 |
|
9b1fc4e49
|
629 630 |
get_random_bytes(&nilfs->ns_next_generation, sizeof(nilfs->ns_next_generation)); |
e339ad31f
|
631 |
err = nilfs_store_disk_layout(nilfs, sbp); |
8a9d2191e
|
632 633 634 635 636 637 |
if (err) goto failed_sbh; sb->s_maxbytes = nilfs_max_size(sb->s_blocksize_bits); nilfs->ns_mount_state = le16_to_cpu(sbp->s_state); |
8a9d2191e
|
638 |
|
843d63baa
|
639 640 |
err = nilfs_store_log_cursor(nilfs, sbp); if (err) |
8a9d2191e
|
641 |
goto failed_sbh; |
8a9d2191e
|
642 |
|
dd70edbde
|
643 644 645 |
err = nilfs_sysfs_create_device_group(sb); if (err) goto failed_sbh; |
8a9d2191e
|
646 647 648 649 650 651 652 |
set_nilfs_init(nilfs); err = 0; out: up_write(&nilfs->ns_sem); return err; failed_sbh: |
e339ad31f
|
653 |
nilfs_release_super_block(nilfs); |
8a9d2191e
|
654 655 |
goto out; } |
e902ec990
|
656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 |
int nilfs_discard_segments(struct the_nilfs *nilfs, __u64 *segnump, size_t nsegs) { sector_t seg_start, seg_end; sector_t start = 0, nblocks = 0; unsigned int sects_per_block; __u64 *sn; int ret = 0; sects_per_block = (1 << nilfs->ns_blocksize_bits) / bdev_logical_block_size(nilfs->ns_bdev); for (sn = segnump; sn < segnump + nsegs; sn++) { nilfs_get_segment_range(nilfs, *sn, &seg_start, &seg_end); if (!nblocks) { start = seg_start; nblocks = seg_end - seg_start + 1; } else if (start + nblocks == seg_start) { nblocks += seg_end - seg_start + 1; } else { ret = blkdev_issue_discard(nilfs->ns_bdev, start * sects_per_block, nblocks * sects_per_block, |
dd3932edd
|
679 |
GFP_NOFS, 0); |
e902ec990
|
680 681 682 683 684 685 686 687 688 |
if (ret < 0) return ret; nblocks = 0; } } if (nblocks) ret = blkdev_issue_discard(nilfs->ns_bdev, start * sects_per_block, nblocks * sects_per_block, |
dd3932edd
|
689 |
GFP_NOFS, 0); |
e902ec990
|
690 691 |
return ret; } |
8a9d2191e
|
692 693 |
int nilfs_count_free_blocks(struct the_nilfs *nilfs, sector_t *nblocks) { |
8a9d2191e
|
694 |
unsigned long ncleansegs; |
8a9d2191e
|
695 |
|
365e215ce
|
696 |
down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); |
ef7d4757a
|
697 |
ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile); |
365e215ce
|
698 |
up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); |
ef7d4757a
|
699 700 |
*nblocks = (sector_t)ncleansegs * nilfs->ns_blocks_per_segment; return 0; |
8a9d2191e
|
701 |
} |
8a9d2191e
|
702 703 |
int nilfs_near_disk_full(struct the_nilfs *nilfs) { |
8a9d2191e
|
704 |
unsigned long ncleansegs, nincsegs; |
ef7d4757a
|
705 706 707 708 709 710 |
ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile); nincsegs = atomic_read(&nilfs->ns_ndirtyblks) / nilfs->ns_blocks_per_segment + 1; return ncleansegs <= nilfs->ns_nrsvsegs + nincsegs; |
8a9d2191e
|
711 |
} |
ba65ae472
|
712 |
struct nilfs_root *nilfs_lookup_root(struct the_nilfs *nilfs, __u64 cno) |
6dd474066
|
713 |
{ |
ba65ae472
|
714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 |
struct rb_node *n; struct nilfs_root *root; spin_lock(&nilfs->ns_cptree_lock); n = nilfs->ns_cptree.rb_node; while (n) { root = rb_entry(n, struct nilfs_root, rb_node); if (cno < root->cno) { n = n->rb_left; } else if (cno > root->cno) { n = n->rb_right; } else { atomic_inc(&root->count); spin_unlock(&nilfs->ns_cptree_lock); return root; } |
6dd474066
|
731 |
} |
ba65ae472
|
732 |
spin_unlock(&nilfs->ns_cptree_lock); |
6dd474066
|
733 |
|
6dd474066
|
734 |
return NULL; |
6dd474066
|
735 |
} |
ba65ae472
|
736 737 |
struct nilfs_root * nilfs_find_or_create_root(struct the_nilfs *nilfs, __u64 cno) |
8a9d2191e
|
738 |
{ |
ba65ae472
|
739 740 |
struct rb_node **p, *parent; struct nilfs_root *root, *new; |
dd70edbde
|
741 |
int err; |
8a9d2191e
|
742 |
|
ba65ae472
|
743 744 745 |
root = nilfs_lookup_root(nilfs, cno); if (root) return root; |
8a9d2191e
|
746 |
|
dd70edbde
|
747 |
new = kzalloc(sizeof(*root), GFP_KERNEL); |
ba65ae472
|
748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 |
if (!new) return NULL; spin_lock(&nilfs->ns_cptree_lock); p = &nilfs->ns_cptree.rb_node; parent = NULL; while (*p) { parent = *p; root = rb_entry(parent, struct nilfs_root, rb_node); if (cno < root->cno) { p = &(*p)->rb_left; } else if (cno > root->cno) { p = &(*p)->rb_right; } else { atomic_inc(&root->count); spin_unlock(&nilfs->ns_cptree_lock); kfree(new); return root; |
8a9d2191e
|
769 770 |
} } |
8a9d2191e
|
771 |
|
ba65ae472
|
772 773 774 775 |
new->cno = cno; new->ifile = NULL; new->nilfs = nilfs; atomic_set(&new->count, 1); |
e5f7f8484
|
776 777 |
atomic64_set(&new->inodes_count, 0); atomic64_set(&new->blocks_count, 0); |
ba65ae472
|
778 779 780 781 782 |
rb_link_node(&new->rb_node, parent, p); rb_insert_color(&new->rb_node, &nilfs->ns_cptree); spin_unlock(&nilfs->ns_cptree_lock); |
dd70edbde
|
783 784 785 786 787 |
err = nilfs_sysfs_create_snapshot_group(new); if (err) { kfree(new); new = NULL; } |
ba65ae472
|
788 789 790 791 792 793 794 |
return new; } void nilfs_put_root(struct nilfs_root *root) { if (atomic_dec_and_test(&root->count)) { struct the_nilfs *nilfs = root->nilfs; |
dd70edbde
|
795 |
nilfs_sysfs_delete_snapshot_group(root); |
ba65ae472
|
796 797 798 |
spin_lock(&nilfs->ns_cptree_lock); rb_erase(&root->rb_node, &nilfs->ns_cptree); spin_unlock(&nilfs->ns_cptree_lock); |
72b9918ea
|
799 |
iput(root->ifile); |
ba65ae472
|
800 801 802 |
kfree(root); } |
8a9d2191e
|
803 |
} |