| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * the_nilfs shared structure. |
| * |
| * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. |
| * |
| * Written by Ryusuke Konishi. |
| * |
| */ |
| |
| #include <linux/buffer_head.h> |
| #include <linux/slab.h> |
| #include <linux/blkdev.h> |
| #include <linux/backing-dev.h> |
| #include <linux/random.h> |
| #include <linux/crc32.h> |
| #include "nilfs.h" |
| #include "segment.h" |
| #include "alloc.h" |
| #include "cpfile.h" |
| #include "sufile.h" |
| #include "dat.h" |
| #include "segbuf.h" |
| |
| |
| static int nilfs_valid_sb(struct nilfs_super_block *sbp); |
| |
| 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; |
| |
| 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: |
| spin_unlock(&nilfs->ns_last_segment_lock); |
| } |
| |
| /** |
| * alloc_nilfs - allocate a nilfs object |
| * @sb: super block instance |
| * |
| * Return Value: On success, pointer to the_nilfs is returned. |
| * On error, NULL is returned. |
| */ |
| struct the_nilfs *alloc_nilfs(struct super_block *sb) |
| { |
| struct the_nilfs *nilfs; |
| |
| nilfs = kzalloc(sizeof(*nilfs), GFP_KERNEL); |
| if (!nilfs) |
| return NULL; |
| |
| nilfs->ns_sb = sb; |
| nilfs->ns_bdev = sb->s_bdev; |
| atomic_set(&nilfs->ns_ndirtyblks, 0); |
| init_rwsem(&nilfs->ns_sem); |
| mutex_init(&nilfs->ns_snapshot_mount_mutex); |
| INIT_LIST_HEAD(&nilfs->ns_dirty_files); |
| INIT_LIST_HEAD(&nilfs->ns_gc_inodes); |
| spin_lock_init(&nilfs->ns_inode_lock); |
| spin_lock_init(&nilfs->ns_next_gen_lock); |
| spin_lock_init(&nilfs->ns_last_segment_lock); |
| nilfs->ns_cptree = RB_ROOT; |
| spin_lock_init(&nilfs->ns_cptree_lock); |
| init_rwsem(&nilfs->ns_segctor_sem); |
| nilfs->ns_sb_update_freq = NILFS_SB_FREQ; |
| |
| return nilfs; |
| } |
| |
| /** |
| * destroy_nilfs - destroy nilfs object |
| * @nilfs: nilfs object to be released |
| */ |
| void destroy_nilfs(struct the_nilfs *nilfs) |
| { |
| might_sleep(); |
| if (nilfs_init(nilfs)) { |
| nilfs_sysfs_delete_device_group(nilfs); |
| brelse(nilfs->ns_sbh[0]); |
| brelse(nilfs->ns_sbh[1]); |
| } |
| kfree(nilfs); |
| } |
| |
| static int nilfs_load_super_root(struct the_nilfs *nilfs, |
| struct super_block *sb, sector_t sr_block) |
| { |
| struct buffer_head *bh_sr; |
| struct nilfs_super_root *raw_sr; |
| struct nilfs_super_block **sbp = nilfs->ns_sbp; |
| struct nilfs_inode *rawi; |
| unsigned int dat_entry_size, segment_usage_size, checkpoint_size; |
| unsigned int inode_size; |
| int err; |
| |
| err = nilfs_read_super_root_block(nilfs, sr_block, &bh_sr, 1); |
| if (unlikely(err)) |
| return err; |
| |
| down_read(&nilfs->ns_sem); |
| 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); |
| up_read(&nilfs->ns_sem); |
| |
| inode_size = nilfs->ns_inode_size; |
| |
| 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) |
| goto failed; |
| |
| 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) |
| goto failed_dat; |
| |
| 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) |
| goto failed_cpfile; |
| |
| 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; |
| |
| failed_cpfile: |
| iput(nilfs->ns_cpfile); |
| |
| failed_dat: |
| iput(nilfs->ns_dat); |
| 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); |
| } |
| |
| /** |
| * 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); |
| |
| nilfs->ns_prev_seq = nilfs->ns_last_seq; |
| 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) { |
| nilfs_err(nilfs->ns_sb, |
| "pointed segment number is out of range: segnum=%llu, nsegments=%lu", |
| (unsigned long long)nilfs->ns_segnum, |
| nilfs->ns_nsegments); |
| ret = -EINVAL; |
| } |
| return ret; |
| } |
| |
| /** |
| * load_nilfs - load and recover the nilfs |
| * @nilfs: the_nilfs structure to be released |
| * @sb: super block instance used to recover past segment |
| * |
| * 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. |
| */ |
| int load_nilfs(struct the_nilfs *nilfs, struct super_block *sb) |
| { |
| struct nilfs_recovery_info ri; |
| unsigned int s_flags = sb->s_flags; |
| int really_read_only = bdev_read_only(nilfs->ns_bdev); |
| int valid_fs = nilfs_valid_fs(nilfs); |
| int err; |
| |
| if (!valid_fs) { |
| nilfs_warn(sb, "mounting unchecked fs"); |
| if (s_flags & SB_RDONLY) { |
| nilfs_info(sb, |
| "recovery required for readonly filesystem"); |
| nilfs_info(sb, |
| "write access will be enabled during recovery"); |
| } |
| } |
| |
| nilfs_init_recovery_info(&ri); |
| |
| err = nilfs_search_super_root(nilfs, &ri); |
| if (unlikely(err)) { |
| struct nilfs_super_block **sbp = nilfs->ns_sbp; |
| int blocksize; |
| |
| if (err != -EINVAL) |
| goto scan_error; |
| |
| if (!nilfs_valid_sb(sbp[1])) { |
| nilfs_warn(sb, |
| "unable to fall back to spare super block"); |
| goto scan_error; |
| } |
| nilfs_info(sb, "trying 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) { |
| nilfs_warn(sb, |
| "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; |
| } |
| |
| err = nilfs_load_super_root(nilfs, sb, ri.ri_super_root); |
| if (unlikely(err)) { |
| nilfs_err(sb, "error %d while loading super root", err); |
| goto failed; |
| } |
| |
| if (valid_fs) |
| goto skip_recovery; |
| |
| if (s_flags & SB_RDONLY) { |
| __u64 features; |
| |
| if (nilfs_test_opt(nilfs, NORECOVERY)) { |
| nilfs_info(sb, |
| "norecovery option specified, skipping roll-forward recovery"); |
| goto skip_recovery; |
| } |
| features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & |
| ~NILFS_FEATURE_COMPAT_RO_SUPP; |
| if (features) { |
| nilfs_err(sb, |
| "couldn't proceed with recovery because of unsupported optional features (%llx)", |
| (unsigned long long)features); |
| err = -EROFS; |
| goto failed_unload; |
| } |
| if (really_read_only) { |
| nilfs_err(sb, |
| "write access unavailable, cannot proceed"); |
| err = -EROFS; |
| goto failed_unload; |
| } |
| sb->s_flags &= ~SB_RDONLY; |
| } else if (nilfs_test_opt(nilfs, NORECOVERY)) { |
| nilfs_err(sb, |
| "recovery cancelled because norecovery option was specified for a read/write mount"); |
| err = -EINVAL; |
| goto failed_unload; |
| } |
| |
| err = nilfs_salvage_orphan_logs(nilfs, sb, &ri); |
| if (err) |
| goto failed_unload; |
| |
| down_write(&nilfs->ns_sem); |
| nilfs->ns_mount_state |= NILFS_VALID_FS; /* set "clean" flag */ |
| err = nilfs_cleanup_super(sb); |
| up_write(&nilfs->ns_sem); |
| |
| if (err) { |
| nilfs_err(sb, |
| "error %d updating super block. recovery unfinished.", |
| err); |
| goto failed_unload; |
| } |
| nilfs_info(sb, "recovery complete"); |
| |
| skip_recovery: |
| nilfs_clear_recovery_info(&ri); |
| sb->s_flags = s_flags; |
| return 0; |
| |
| scan_error: |
| nilfs_err(sb, "error %d while searching super root", err); |
| goto failed; |
| |
| failed_unload: |
| iput(nilfs->ns_cpfile); |
| iput(nilfs->ns_sufile); |
| iput(nilfs->ns_dat); |
| |
| failed: |
| nilfs_clear_recovery_info(&ri); |
| sb->s_flags = s_flags; |
| 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; |
| } |
| |
| /** |
| * 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); |
| } |
| |
| static int nilfs_store_disk_layout(struct the_nilfs *nilfs, |
| struct nilfs_super_block *sbp) |
| { |
| if (le32_to_cpu(sbp->s_rev_level) < NILFS_MIN_SUPP_REV) { |
| nilfs_err(nilfs->ns_sb, |
| "unsupported revision (superblock rev.=%d.%d, current rev.=%d.%d). Please check the version of mkfs.nilfs(2).", |
| le32_to_cpu(sbp->s_rev_level), |
| le16_to_cpu(sbp->s_minor_rev_level), |
| NILFS_CURRENT_REV, NILFS_MINOR_REV); |
| return -EINVAL; |
| } |
| nilfs->ns_sbsize = le16_to_cpu(sbp->s_bytes); |
| if (nilfs->ns_sbsize > BLOCK_SIZE) |
| return -EINVAL; |
| |
| nilfs->ns_inode_size = le16_to_cpu(sbp->s_inode_size); |
| if (nilfs->ns_inode_size > nilfs->ns_blocksize) { |
| nilfs_err(nilfs->ns_sb, "too large inode size: %d bytes", |
| nilfs->ns_inode_size); |
| return -EINVAL; |
| } else if (nilfs->ns_inode_size < NILFS_MIN_INODE_SIZE) { |
| nilfs_err(nilfs->ns_sb, "too small inode size: %d bytes", |
| nilfs->ns_inode_size); |
| return -EINVAL; |
| } |
| |
| 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) { |
| nilfs_err(nilfs->ns_sb, "too short segment: %lu blocks", |
| nilfs->ns_blocks_per_segment); |
| return -EINVAL; |
| } |
| |
| nilfs->ns_first_data_block = le64_to_cpu(sbp->s_first_data_block); |
| nilfs->ns_r_segments_percentage = |
| le32_to_cpu(sbp->s_r_segments_percentage); |
| if (nilfs->ns_r_segments_percentage < 1 || |
| nilfs->ns_r_segments_percentage > 99) { |
| nilfs_err(nilfs->ns_sb, |
| "invalid reserved segments percentage: %lu", |
| nilfs->ns_r_segments_percentage); |
| return -EINVAL; |
| } |
| |
| nilfs_set_nsegments(nilfs, le64_to_cpu(sbp->s_nsegments)); |
| nilfs->ns_crc_seed = le32_to_cpu(sbp->s_crc_seed); |
| return 0; |
| } |
| |
| 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 < sumoff + 4 || 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(bdev_nr_bytes(nilfs->ns_bdev)); |
| 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]) { |
| nilfs_err(sb, "unable to read superblock"); |
| return -EIO; |
| } |
| nilfs_warn(sb, |
| "unable to read primary superblock (blocksize = %d)", |
| blocksize); |
| } else if (!sbp[1]) { |
| nilfs_warn(sb, |
| "unable to read secondary superblock (blocksize = %d)", |
| blocksize); |
| } |
| |
| /* |
| * Compare two super blocks and set 1 in swp if the secondary |
| * super block is valid and newer. Otherwise, set 0 in swp. |
| */ |
| valid[0] = nilfs_valid_sb(sbp[0]); |
| valid[1] = nilfs_valid_sb(sbp[1]); |
| swp = valid[1] && (!valid[0] || |
| le64_to_cpu(sbp[1]->s_last_cno) > |
| le64_to_cpu(sbp[0]->s_last_cno)); |
| |
| if (valid[swp] && nilfs_sb2_bad_offset(sbp[swp], sb2off)) { |
| brelse(sbh[1]); |
| sbh[1] = NULL; |
| sbp[1] = NULL; |
| valid[1] = 0; |
| swp = 0; |
| } |
| if (!valid[swp]) { |
| nilfs_release_super_block(nilfs); |
| nilfs_err(sb, "couldn't find nilfs on the device"); |
| return -EINVAL; |
| } |
| |
| if (!valid[!swp]) |
| nilfs_warn(sb, |
| "broken superblock, retrying with spare superblock (blocksize = %d)", |
| blocksize); |
| if (swp) |
| nilfs_swap_super_block(nilfs); |
| |
| nilfs->ns_sbwcount = 0; |
| nilfs->ns_sbwtime = le64_to_cpu(sbp[0]->s_wtime); |
| nilfs->ns_prot_seq = le64_to_cpu(sbp[valid[1] & !swp]->s_last_seq); |
| *sbpp = sbp[0]; |
| return 0; |
| } |
| |
| /** |
| * init_nilfs - initialize a NILFS instance. |
| * @nilfs: the_nilfs structure |
| * @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 |
| * shared fields in the_nilfs). |
| * |
| * Return Value: On success, 0 is returned. On error, a negative error |
| * code is returned. |
| */ |
| int init_nilfs(struct the_nilfs *nilfs, struct super_block *sb, char *data) |
| { |
| struct nilfs_super_block *sbp; |
| int blocksize; |
| int err; |
| |
| down_write(&nilfs->ns_sem); |
| |
| blocksize = sb_min_blocksize(sb, NILFS_MIN_BLOCK_SIZE); |
| if (!blocksize) { |
| nilfs_err(sb, "unable to set blocksize"); |
| err = -EINVAL; |
| goto out; |
| } |
| err = nilfs_load_super_block(nilfs, sb, blocksize, &sbp); |
| if (err) |
| goto out; |
| |
| err = nilfs_store_magic_and_option(sb, sbp, data); |
| if (err) |
| goto failed_sbh; |
| |
| err = nilfs_check_feature_compatibility(sb, sbp); |
| if (err) |
| goto failed_sbh; |
| |
| blocksize = BLOCK_SIZE << le32_to_cpu(sbp->s_log_block_size); |
| if (blocksize < NILFS_MIN_BLOCK_SIZE || |
| blocksize > NILFS_MAX_BLOCK_SIZE) { |
| nilfs_err(sb, |
| "couldn't mount because of unsupported filesystem blocksize %d", |
| blocksize); |
| err = -EINVAL; |
| goto failed_sbh; |
| } |
| if (sb->s_blocksize != blocksize) { |
| int hw_blocksize = bdev_logical_block_size(sb->s_bdev); |
| |
| if (blocksize < hw_blocksize) { |
| nilfs_err(sb, |
| "blocksize %d too small for device (sector-size = %d)", |
| blocksize, hw_blocksize); |
| err = -EINVAL; |
| goto failed_sbh; |
| } |
| nilfs_release_super_block(nilfs); |
| sb_set_blocksize(sb, blocksize); |
| |
| err = nilfs_load_super_block(nilfs, sb, blocksize, &sbp); |
| if (err) |
| goto out; |
| /* |
| * Not to failed_sbh; sbh is released automatically |
| * when reloading fails. |
| */ |
| } |
| nilfs->ns_blocksize_bits = sb->s_blocksize_bits; |
| nilfs->ns_blocksize = blocksize; |
| |
| get_random_bytes(&nilfs->ns_next_generation, |
| sizeof(nilfs->ns_next_generation)); |
| |
| err = nilfs_store_disk_layout(nilfs, sbp); |
| 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); |
| |
| err = nilfs_store_log_cursor(nilfs, sbp); |
| if (err) |
| goto failed_sbh; |
| |
| err = nilfs_sysfs_create_device_group(sb); |
| if (err) |
| goto failed_sbh; |
| |
| set_nilfs_init(nilfs); |
| err = 0; |
| out: |
| up_write(&nilfs->ns_sem); |
| return err; |
| |
| failed_sbh: |
| nilfs_release_super_block(nilfs); |
| goto out; |
| } |
| |
| 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, |
| GFP_NOFS); |
| if (ret < 0) |
| return ret; |
| nblocks = 0; |
| } |
| } |
| if (nblocks) |
| ret = blkdev_issue_discard(nilfs->ns_bdev, |
| start * sects_per_block, |
| nblocks * sects_per_block, |
| GFP_NOFS); |
| return ret; |
| } |
| |
| int nilfs_count_free_blocks(struct the_nilfs *nilfs, sector_t *nblocks) |
| { |
| unsigned long ncleansegs; |
| |
| ncleansegs = nilfs_sufile_get_ncleansegs(nilfs->ns_sufile); |
| *nblocks = (sector_t)ncleansegs * nilfs->ns_blocks_per_segment; |
| return 0; |
| } |
| |
| int nilfs_near_disk_full(struct the_nilfs *nilfs) |
| { |
| unsigned long ncleansegs, nincsegs; |
| |
| 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; |
| } |
| |
| struct nilfs_root *nilfs_lookup_root(struct the_nilfs *nilfs, __u64 cno) |
| { |
| 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 { |
| refcount_inc(&root->count); |
| spin_unlock(&nilfs->ns_cptree_lock); |
| return root; |
| } |
| } |
| spin_unlock(&nilfs->ns_cptree_lock); |
| |
| return NULL; |
| } |
| |
| struct nilfs_root * |
| nilfs_find_or_create_root(struct the_nilfs *nilfs, __u64 cno) |
| { |
| struct rb_node **p, *parent; |
| struct nilfs_root *root, *new; |
| int err; |
| |
| root = nilfs_lookup_root(nilfs, cno); |
| if (root) |
| return root; |
| |
| new = kzalloc(sizeof(*root), GFP_KERNEL); |
| 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 { |
| refcount_inc(&root->count); |
| spin_unlock(&nilfs->ns_cptree_lock); |
| kfree(new); |
| return root; |
| } |
| } |
| |
| new->cno = cno; |
| new->ifile = NULL; |
| new->nilfs = nilfs; |
| refcount_set(&new->count, 1); |
| atomic64_set(&new->inodes_count, 0); |
| atomic64_set(&new->blocks_count, 0); |
| |
| rb_link_node(&new->rb_node, parent, p); |
| rb_insert_color(&new->rb_node, &nilfs->ns_cptree); |
| |
| spin_unlock(&nilfs->ns_cptree_lock); |
| |
| err = nilfs_sysfs_create_snapshot_group(new); |
| if (err) { |
| kfree(new); |
| new = NULL; |
| } |
| |
| return new; |
| } |
| |
| void nilfs_put_root(struct nilfs_root *root) |
| { |
| struct the_nilfs *nilfs = root->nilfs; |
| |
| if (refcount_dec_and_lock(&root->count, &nilfs->ns_cptree_lock)) { |
| rb_erase(&root->rb_node, &nilfs->ns_cptree); |
| spin_unlock(&nilfs->ns_cptree_lock); |
| |
| nilfs_sysfs_delete_snapshot_group(root); |
| iput(root->ifile); |
| |
| kfree(root); |
| } |
| } |