| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Ryusuke Konishi | 4546 | 74.41% | 77 | 59.69% |
| Jiro SEKIBA | 585 | 9.58% | 7 | 5.43% |
| Eric Sandeen | 476 | 7.79% | 1 | 0.78% |
| Vyacheslav Dubeyko | 75 | 1.23% | 3 | 2.33% |
| Joe Perches | 73 | 1.19% | 3 | 2.33% |
| Li Hong | 72 | 1.18% | 2 | 1.55% |
| Christoph Hellwig | 66 | 1.08% | 6 | 4.65% |
| Koji Sato | 63 | 1.03% | 3 | 2.33% |
| David Howells | 39 | 0.64% | 2 | 1.55% |
| Al Viro | 35 | 0.57% | 9 | 6.98% |
| Andreas Rohner | 22 | 0.36% | 1 | 0.78% |
| Zhang Qiang | 16 | 0.26% | 1 | 0.78% |
| Linus Torvalds | 9 | 0.15% | 1 | 0.78% |
| Eric W. Biedermann | 5 | 0.08% | 1 | 0.78% |
| Kirill A. Shutemov | 4 | 0.07% | 1 | 0.78% |
| Jan Kara | 4 | 0.07% | 2 | 1.55% |
| Nicholas Piggin | 4 | 0.07% | 1 | 0.78% |
| Song Muchun | 3 | 0.05% | 1 | 0.78% |
| Arnd Bergmann | 3 | 0.05% | 2 | 1.55% |
| Thorsten Blum | 3 | 0.05% | 1 | 0.78% |
| Vladimir Davydov | 2 | 0.03% | 1 | 0.78% |
| Dmitriy Monakhov | 2 | 0.03% | 1 | 0.78% |
| Alexey Dobriyan | 1 | 0.02% | 1 | 0.78% |
| J. Bruce Fields | 1 | 0.02% | 1 | 0.78% |
| Total | 6109 | 129 |
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// SPDX-License-Identifier: GPL-2.0+ /* * NILFS module and super block management. * * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. * * Written by Ryusuke Konishi. */ /* * linux/fs/ext2/super.c * * Copyright (C) 1992, 1993, 1994, 1995 * Remy Card (card@masi.ibp.fr) * Laboratoire MASI - Institut Blaise Pascal * Universite Pierre et Marie Curie (Paris VI) * * from * * linux/fs/minix/inode.c * * Copyright (C) 1991, 1992 Linus Torvalds * * Big-endian to little-endian byte-swapping/bitmaps by * David S. Miller (davem@caip.rutgers.edu), 1995 */ #include <linux/module.h> #include <linux/string.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/blkdev.h> #include <linux/crc32.h> #include <linux/vfs.h> #include <linux/writeback.h> #include <linux/seq_file.h> #include <linux/mount.h> #include <linux/fs_context.h> #include <linux/fs_parser.h> #include "nilfs.h" #include "export.h" #include "mdt.h" #include "alloc.h" #include "btree.h" #include "btnode.h" #include "page.h" #include "cpfile.h" #include "sufile.h" /* nilfs_sufile_resize(), nilfs_sufile_set_alloc_range() */ #include "ifile.h" #include "dat.h" #include "segment.h" #include "segbuf.h" MODULE_AUTHOR("NTT Corp."); MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " "(NILFS)"); MODULE_LICENSE("GPL"); static struct kmem_cache *nilfs_inode_cachep; struct kmem_cache *nilfs_transaction_cachep; struct kmem_cache *nilfs_segbuf_cachep; struct kmem_cache *nilfs_btree_path_cache; static int nilfs_setup_super(struct super_block *sb, int is_mount); void __nilfs_msg(struct super_block *sb, const char *fmt, ...) { struct va_format vaf; va_list args; int level; va_start(args, fmt); level = printk_get_level(fmt); vaf.fmt = printk_skip_level(fmt); vaf.va = &args; if (sb) printk("%c%cNILFS (%s): %pV\n", KERN_SOH_ASCII, level, sb->s_id, &vaf); else printk("%c%cNILFS: %pV\n", KERN_SOH_ASCII, level, &vaf); va_end(args); } static void nilfs_set_error(struct super_block *sb) { struct the_nilfs *nilfs = sb->s_fs_info; struct nilfs_super_block **sbp; down_write(&nilfs->ns_sem); if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { nilfs->ns_mount_state |= NILFS_ERROR_FS; sbp = nilfs_prepare_super(sb, 0); if (likely(sbp)) { sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS); if (sbp[1]) sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS); nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); } } up_write(&nilfs->ns_sem); } /** * __nilfs_error() - report failure condition on a filesystem * @sb: super block instance * @function: name of calling function * @fmt: format string for message to be output * @...: optional arguments to @fmt * * __nilfs_error() sets an ERROR_FS flag on the superblock as well as * reporting an error message. This function should be called when * NILFS detects incoherences or defects of meta data on disk. * * This implements the body of nilfs_error() macro. Normally, * nilfs_error() should be used. As for sustainable errors such as a * single-shot I/O error, nilfs_err() should be used instead. * * Callers should not add a trailing newline since this will do it. */ void __nilfs_error(struct super_block *sb, const char *function, const char *fmt, ...) { struct the_nilfs *nilfs = sb->s_fs_info; struct va_format vaf; va_list args; va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n", sb->s_id, function, &vaf); va_end(args); if (!sb_rdonly(sb)) { nilfs_set_error(sb); if (nilfs_test_opt(nilfs, ERRORS_RO)) { printk(KERN_CRIT "Remounting filesystem read-only\n"); sb->s_flags |= SB_RDONLY; } } if (nilfs_test_opt(nilfs, ERRORS_PANIC)) panic("NILFS (device %s): panic forced after error\n", sb->s_id); } struct inode *nilfs_alloc_inode(struct super_block *sb) { struct nilfs_inode_info *ii; ii = alloc_inode_sb(sb, nilfs_inode_cachep, GFP_NOFS); if (!ii) return NULL; ii->i_bh = NULL; ii->i_state = 0; ii->i_type = 0; ii->i_cno = 0; ii->i_assoc_inode = NULL; ii->i_bmap = &ii->i_bmap_data; return &ii->vfs_inode; } static void nilfs_free_inode(struct inode *inode) { if (nilfs_is_metadata_file_inode(inode)) nilfs_mdt_destroy(inode); kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); } static int nilfs_sync_super(struct super_block *sb, int flag) { struct the_nilfs *nilfs = sb->s_fs_info; int err; retry: set_buffer_dirty(nilfs->ns_sbh[0]); if (nilfs_test_opt(nilfs, BARRIER)) { err = __sync_dirty_buffer(nilfs->ns_sbh[0], REQ_SYNC | REQ_PREFLUSH | REQ_FUA); } else { err = sync_dirty_buffer(nilfs->ns_sbh[0]); } if (unlikely(err)) { nilfs_err(sb, "unable to write superblock: err=%d", err); if (err == -EIO && nilfs->ns_sbh[1]) { /* * sbp[0] points to newer log than sbp[1], * so copy sbp[0] to sbp[1] to take over sbp[0]. */ memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], nilfs->ns_sbsize); nilfs_fall_back_super_block(nilfs); goto retry; } } else { struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; nilfs->ns_sbwcount++; /* * The latest segment becomes trailable from the position * written in superblock. */ clear_nilfs_discontinued(nilfs); /* update GC protection for recent segments */ if (nilfs->ns_sbh[1]) { if (flag == NILFS_SB_COMMIT_ALL) { set_buffer_dirty(nilfs->ns_sbh[1]); if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) goto out; } if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) sbp = nilfs->ns_sbp[1]; } spin_lock(&nilfs->ns_last_segment_lock); nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); spin_unlock(&nilfs->ns_last_segment_lock); } out: return err; } void nilfs_set_log_cursor(struct nilfs_super_block *sbp, struct the_nilfs *nilfs) { sector_t nfreeblocks; /* nilfs->ns_sem must be locked by the caller. */ nilfs_count_free_blocks(nilfs, &nfreeblocks); sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); spin_lock(&nilfs->ns_last_segment_lock); sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); spin_unlock(&nilfs->ns_last_segment_lock); } struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb, int flip) { struct the_nilfs *nilfs = sb->s_fs_info; struct nilfs_super_block **sbp = nilfs->ns_sbp; /* nilfs->ns_sem must be locked by the caller. */ if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { if (sbp[1] && sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); } else { nilfs_crit(sb, "superblock broke"); return NULL; } } else if (sbp[1] && sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); } if (flip && sbp[1]) nilfs_swap_super_block(nilfs); return sbp; } int nilfs_commit_super(struct super_block *sb, int flag) { struct the_nilfs *nilfs = sb->s_fs_info; struct nilfs_super_block **sbp = nilfs->ns_sbp; time64_t t; /* nilfs->ns_sem must be locked by the caller. */ t = ktime_get_real_seconds(); nilfs->ns_sbwtime = t; sbp[0]->s_wtime = cpu_to_le64(t); sbp[0]->s_sum = 0; sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, (unsigned char *)sbp[0], nilfs->ns_sbsize)); if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { sbp[1]->s_wtime = sbp[0]->s_wtime; sbp[1]->s_sum = 0; sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, (unsigned char *)sbp[1], nilfs->ns_sbsize)); } clear_nilfs_sb_dirty(nilfs); nilfs->ns_flushed_device = 1; /* make sure store to ns_flushed_device cannot be reordered */ smp_wmb(); return nilfs_sync_super(sb, flag); } /** * nilfs_cleanup_super() - write filesystem state for cleanup * @sb: super block instance to be unmounted or degraded to read-only * * This function restores state flags in the on-disk super block. * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the * filesystem was not clean previously. */ int nilfs_cleanup_super(struct super_block *sb) { struct the_nilfs *nilfs = sb->s_fs_info; struct nilfs_super_block **sbp; int flag = NILFS_SB_COMMIT; int ret = -EIO; sbp = nilfs_prepare_super(sb, 0); if (sbp) { sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); nilfs_set_log_cursor(sbp[0], nilfs); if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { /* * make the "clean" flag also to the opposite * super block if both super blocks point to * the same checkpoint. */ sbp[1]->s_state = sbp[0]->s_state; flag = NILFS_SB_COMMIT_ALL; } ret = nilfs_commit_super(sb, flag); } return ret; } /** * nilfs_move_2nd_super - relocate secondary super block * @sb: super block instance * @sb2off: new offset of the secondary super block (in bytes) */ static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off) { struct the_nilfs *nilfs = sb->s_fs_info; struct buffer_head *nsbh; struct nilfs_super_block *nsbp; sector_t blocknr, newblocknr; unsigned long offset; int sb2i; /* array index of the secondary superblock */ int ret = 0; /* nilfs->ns_sem must be locked by the caller. */ if (nilfs->ns_sbh[1] && nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) { sb2i = 1; blocknr = nilfs->ns_sbh[1]->b_blocknr; } else if (nilfs->ns_sbh[0]->b_blocknr > nilfs->ns_first_data_block) { sb2i = 0; blocknr = nilfs->ns_sbh[0]->b_blocknr; } else { sb2i = -1; blocknr = 0; } if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off) goto out; /* super block location is unchanged */ /* Get new super block buffer */ newblocknr = sb2off >> nilfs->ns_blocksize_bits; offset = sb2off & (nilfs->ns_blocksize - 1); nsbh = sb_getblk(sb, newblocknr); if (!nsbh) { nilfs_warn(sb, "unable to move secondary superblock to block %llu", (unsigned long long)newblocknr); ret = -EIO; goto out; } nsbp = (void *)nsbh->b_data + offset; lock_buffer(nsbh); if (sb2i >= 0) { /* * The position of the second superblock only changes by 4KiB, * which is larger than the maximum superblock data size * (= 1KiB), so there is no need to use memmove() to allow * overlap between source and destination. */ memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize); /* * Zero fill after copy to avoid overwriting in case of move * within the same block. */ memset(nsbh->b_data, 0, offset); memset((void *)nsbp + nilfs->ns_sbsize, 0, nsbh->b_size - offset - nilfs->ns_sbsize); } else { memset(nsbh->b_data, 0, nsbh->b_size); } set_buffer_uptodate(nsbh); unlock_buffer(nsbh); if (sb2i >= 0) { brelse(nilfs->ns_sbh[sb2i]); nilfs->ns_sbh[sb2i] = nsbh; nilfs->ns_sbp[sb2i] = nsbp; } else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) { /* secondary super block will be restored to index 1 */ nilfs->ns_sbh[1] = nsbh; nilfs->ns_sbp[1] = nsbp; } else { brelse(nsbh); } out: return ret; } /** * nilfs_resize_fs - resize the filesystem * @sb: super block instance * @newsize: new size of the filesystem (in bytes) */ int nilfs_resize_fs(struct super_block *sb, __u64 newsize) { struct the_nilfs *nilfs = sb->s_fs_info; struct nilfs_super_block **sbp; __u64 devsize, newnsegs; loff_t sb2off; int ret; ret = -ERANGE; devsize = bdev_nr_bytes(sb->s_bdev); if (newsize > devsize) goto out; /* * Prevent underflow in second superblock position calculation. * The exact minimum size check is done in nilfs_sufile_resize(). */ if (newsize < 4096) { ret = -ENOSPC; goto out; } /* * Write lock is required to protect some functions depending * on the number of segments, the number of reserved segments, * and so forth. */ down_write(&nilfs->ns_segctor_sem); sb2off = NILFS_SB2_OFFSET_BYTES(newsize); newnsegs = sb2off >> nilfs->ns_blocksize_bits; newnsegs = div64_ul(newnsegs, nilfs->ns_blocks_per_segment); ret = nilfs_sufile_resize(nilfs->ns_sufile, newnsegs); up_write(&nilfs->ns_segctor_sem); if (ret < 0) goto out; ret = nilfs_construct_segment(sb); if (ret < 0) goto out; down_write(&nilfs->ns_sem); nilfs_move_2nd_super(sb, sb2off); ret = -EIO; sbp = nilfs_prepare_super(sb, 0); if (likely(sbp)) { nilfs_set_log_cursor(sbp[0], nilfs); /* * Drop NILFS_RESIZE_FS flag for compatibility with * mount-time resize which may be implemented in a * future release. */ sbp[0]->s_state = cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_RESIZE_FS); sbp[0]->s_dev_size = cpu_to_le64(newsize); sbp[0]->s_nsegments = cpu_to_le64(nilfs->ns_nsegments); if (sbp[1]) memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); } up_write(&nilfs->ns_sem); /* * Reset the range of allocatable segments last. This order * is important in the case of expansion because the secondary * superblock must be protected from log write until migration * completes. */ if (!ret) nilfs_sufile_set_alloc_range(nilfs->ns_sufile, 0, newnsegs - 1); out: return ret; } static void nilfs_put_super(struct super_block *sb) { struct the_nilfs *nilfs = sb->s_fs_info; nilfs_detach_log_writer(sb); if (!sb_rdonly(sb)) { down_write(&nilfs->ns_sem); nilfs_cleanup_super(sb); up_write(&nilfs->ns_sem); } nilfs_sysfs_delete_device_group(nilfs); iput(nilfs->ns_sufile); iput(nilfs->ns_cpfile); iput(nilfs->ns_dat); destroy_nilfs(nilfs); sb->s_fs_info = NULL; } static int nilfs_sync_fs(struct super_block *sb, int wait) { struct the_nilfs *nilfs = sb->s_fs_info; struct nilfs_super_block **sbp; int err = 0; /* This function is called when super block should be written back */ if (wait) err = nilfs_construct_segment(sb); down_write(&nilfs->ns_sem); if (nilfs_sb_dirty(nilfs)) { sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs)); if (likely(sbp)) { nilfs_set_log_cursor(sbp[0], nilfs); nilfs_commit_super(sb, NILFS_SB_COMMIT); } } up_write(&nilfs->ns_sem); if (!err) err = nilfs_flush_device(nilfs); return err; } int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt, struct nilfs_root **rootp) { struct the_nilfs *nilfs = sb->s_fs_info; struct nilfs_root *root; int err = -ENOMEM; root = nilfs_find_or_create_root( nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); if (!root) return err; if (root->ifile) goto reuse; /* already attached checkpoint */ down_read(&nilfs->ns_segctor_sem); err = nilfs_ifile_read(sb, root, cno, nilfs->ns_inode_size); up_read(&nilfs->ns_segctor_sem); if (unlikely(err)) goto failed; reuse: *rootp = root; return 0; failed: if (err == -EINVAL) nilfs_err(sb, "Invalid checkpoint (checkpoint number=%llu)", (unsigned long long)cno); nilfs_put_root(root); return err; } static int nilfs_freeze(struct super_block *sb) { struct the_nilfs *nilfs = sb->s_fs_info; int err; if (sb_rdonly(sb)) return 0; /* Mark super block clean */ down_write(&nilfs->ns_sem); err = nilfs_cleanup_super(sb); up_write(&nilfs->ns_sem); return err; } static int nilfs_unfreeze(struct super_block *sb) { struct the_nilfs *nilfs = sb->s_fs_info; if (sb_rdonly(sb)) return 0; down_write(&nilfs->ns_sem); nilfs_setup_super(sb, false); up_write(&nilfs->ns_sem); return 0; } static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) { struct super_block *sb = dentry->d_sb; struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root; struct the_nilfs *nilfs = root->nilfs; u64 id = huge_encode_dev(sb->s_bdev->bd_dev); unsigned long long blocks; unsigned long overhead; unsigned long nrsvblocks; sector_t nfreeblocks; u64 nmaxinodes, nfreeinodes; int err; /* * Compute all of the segment blocks * * The blocks before first segment and after last segment * are excluded. */ blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments - nilfs->ns_first_data_block; nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; /* * Compute the overhead * * When distributing meta data blocks outside segment structure, * We must count them as the overhead. */ overhead = 0; err = nilfs_count_free_blocks(nilfs, &nfreeblocks); if (unlikely(err)) return err; err = nilfs_ifile_count_free_inodes(root->ifile, &nmaxinodes, &nfreeinodes); if (unlikely(err)) { nilfs_warn(sb, "failed to count free inodes: err=%d", err); if (err == -ERANGE) { /* * If nilfs_palloc_count_max_entries() returns * -ERANGE error code then we simply treat * curent inodes count as maximum possible and * zero as free inodes value. */ nmaxinodes = atomic64_read(&root->inodes_count); nfreeinodes = 0; err = 0; } else return err; } buf->f_type = NILFS_SUPER_MAGIC; buf->f_bsize = sb->s_blocksize; buf->f_blocks = blocks - overhead; buf->f_bfree = nfreeblocks; buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? (buf->f_bfree - nrsvblocks) : 0; buf->f_files = nmaxinodes; buf->f_ffree = nfreeinodes; buf->f_namelen = NILFS_NAME_LEN; buf->f_fsid = u64_to_fsid(id); return 0; } static int nilfs_show_options(struct seq_file *seq, struct dentry *dentry) { struct super_block *sb = dentry->d_sb; struct the_nilfs *nilfs = sb->s_fs_info; struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root; if (!nilfs_test_opt(nilfs, BARRIER)) seq_puts(seq, ",nobarrier"); if (root->cno != NILFS_CPTREE_CURRENT_CNO) seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); if (nilfs_test_opt(nilfs, ERRORS_PANIC)) seq_puts(seq, ",errors=panic"); if (nilfs_test_opt(nilfs, ERRORS_CONT)) seq_puts(seq, ",errors=continue"); if (nilfs_test_opt(nilfs, STRICT_ORDER)) seq_puts(seq, ",order=strict"); if (nilfs_test_opt(nilfs, NORECOVERY)) seq_puts(seq, ",norecovery"); if (nilfs_test_opt(nilfs, DISCARD)) seq_puts(seq, ",discard"); return 0; } static const struct super_operations nilfs_sops = { .alloc_inode = nilfs_alloc_inode, .free_inode = nilfs_free_inode, .dirty_inode = nilfs_dirty_inode, .evict_inode = nilfs_evict_inode, .put_super = nilfs_put_super, .sync_fs = nilfs_sync_fs, .freeze_fs = nilfs_freeze, .unfreeze_fs = nilfs_unfreeze, .statfs = nilfs_statfs, .show_options = nilfs_show_options }; enum { Opt_err, Opt_barrier, Opt_snapshot, Opt_order, Opt_norecovery, Opt_discard, }; static const struct constant_table nilfs_param_err[] = { {"continue", NILFS_MOUNT_ERRORS_CONT}, {"panic", NILFS_MOUNT_ERRORS_PANIC}, {"remount-ro", NILFS_MOUNT_ERRORS_RO}, {} }; static const struct fs_parameter_spec nilfs_param_spec[] = { fsparam_enum ("errors", Opt_err, nilfs_param_err), fsparam_flag_no ("barrier", Opt_barrier), fsparam_u64 ("cp", Opt_snapshot), fsparam_string ("order", Opt_order), fsparam_flag ("norecovery", Opt_norecovery), fsparam_flag_no ("discard", Opt_discard), {} }; struct nilfs_fs_context { unsigned long ns_mount_opt; __u64 cno; }; static int nilfs_parse_param(struct fs_context *fc, struct fs_parameter *param) { struct nilfs_fs_context *nilfs = fc->fs_private; int is_remount = fc->purpose == FS_CONTEXT_FOR_RECONFIGURE; struct fs_parse_result result; int opt; opt = fs_parse(fc, nilfs_param_spec, param, &result); if (opt < 0) return opt; switch (opt) { case Opt_barrier: if (result.negated) nilfs_clear_opt(nilfs, BARRIER); else nilfs_set_opt(nilfs, BARRIER); break; case Opt_order: if (strcmp(param->string, "relaxed") == 0) /* Ordered data semantics */ nilfs_clear_opt(nilfs, STRICT_ORDER); else if (strcmp(param->string, "strict") == 0) /* Strict in-order semantics */ nilfs_set_opt(nilfs, STRICT_ORDER); else return -EINVAL; break; case Opt_err: nilfs->ns_mount_opt &= ~NILFS_MOUNT_ERROR_MODE; nilfs->ns_mount_opt |= result.uint_32; break; case Opt_snapshot: if (is_remount) { struct super_block *sb = fc->root->d_sb; nilfs_err(sb, "\"%s\" option is invalid for remount", param->key); return -EINVAL; } if (result.uint_64 == 0) { nilfs_err(NULL, "invalid option \"cp=0\": invalid checkpoint number 0"); return -EINVAL; } nilfs->cno = result.uint_64; break; case Opt_norecovery: nilfs_set_opt(nilfs, NORECOVERY); break; case Opt_discard: if (result.negated) nilfs_clear_opt(nilfs, DISCARD); else nilfs_set_opt(nilfs, DISCARD); break; default: return -EINVAL; } return 0; } static int nilfs_setup_super(struct super_block *sb, int is_mount) { struct the_nilfs *nilfs = sb->s_fs_info; struct nilfs_super_block **sbp; int max_mnt_count; int mnt_count; /* nilfs->ns_sem must be locked by the caller. */ sbp = nilfs_prepare_super(sb, 0); if (!sbp) return -EIO; if (!is_mount) goto skip_mount_setup; max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); if (nilfs->ns_mount_state & NILFS_ERROR_FS) { nilfs_warn(sb, "mounting fs with errors"); #if 0 } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { nilfs_warn(sb, "maximal mount count reached"); #endif } if (!max_mnt_count) sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); sbp[0]->s_mtime = cpu_to_le64(ktime_get_real_seconds()); skip_mount_setup: sbp[0]->s_state = cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); /* synchronize sbp[1] with sbp[0] */ if (sbp[1]) memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL); } struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, u64 pos, int blocksize, struct buffer_head **pbh) { unsigned long long sb_index = pos; unsigned long offset; offset = do_div(sb_index, blocksize); *pbh = sb_bread(sb, sb_index); if (!*pbh) return NULL; return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); } int nilfs_store_magic(struct super_block *sb, struct nilfs_super_block *sbp) { struct the_nilfs *nilfs = sb->s_fs_info; sb->s_magic = le16_to_cpu(sbp->s_magic); /* FS independent flags */ #ifdef NILFS_ATIME_DISABLE sb->s_flags |= SB_NOATIME; #endif nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid); nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid); nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval); nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max); return 0; } int nilfs_check_feature_compatibility(struct super_block *sb, struct nilfs_super_block *sbp) { __u64 features; features = le64_to_cpu(sbp->s_feature_incompat) & ~NILFS_FEATURE_INCOMPAT_SUPP; if (features) { nilfs_err(sb, "couldn't mount because of unsupported optional features (%llx)", (unsigned long long)features); return -EINVAL; } features = le64_to_cpu(sbp->s_feature_compat_ro) & ~NILFS_FEATURE_COMPAT_RO_SUPP; if (!sb_rdonly(sb) && features) { nilfs_err(sb, "couldn't mount RDWR because of unsupported optional features (%llx)", (unsigned long long)features); return -EINVAL; } return 0; } static int nilfs_get_root_dentry(struct super_block *sb, struct nilfs_root *root, struct dentry **root_dentry) { struct inode *inode; struct dentry *dentry; int ret = 0; inode = nilfs_iget(sb, root, NILFS_ROOT_INO); if (IS_ERR(inode)) { ret = PTR_ERR(inode); nilfs_err(sb, "error %d getting root inode", ret); goto out; } if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { iput(inode); nilfs_err(sb, "corrupt root inode"); ret = -EINVAL; goto out; } if (root->cno == NILFS_CPTREE_CURRENT_CNO) { dentry = d_find_alias(inode); if (!dentry) { dentry = d_make_root(inode); if (!dentry) { ret = -ENOMEM; goto failed_dentry; } } else { iput(inode); } } else { dentry = d_obtain_root(inode); if (IS_ERR(dentry)) { ret = PTR_ERR(dentry); goto failed_dentry; } } *root_dentry = dentry; out: return ret; failed_dentry: nilfs_err(sb, "error %d getting root dentry", ret); goto out; } static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, struct dentry **root_dentry) { struct the_nilfs *nilfs = s->s_fs_info; struct nilfs_root *root; int ret; mutex_lock(&nilfs->ns_snapshot_mount_mutex); down_read(&nilfs->ns_segctor_sem); ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); up_read(&nilfs->ns_segctor_sem); if (ret < 0) { ret = (ret == -ENOENT) ? -EINVAL : ret; goto out; } else if (!ret) { nilfs_err(s, "The specified checkpoint is not a snapshot (checkpoint number=%llu)", (unsigned long long)cno); ret = -EINVAL; goto out; } ret = nilfs_attach_checkpoint(s, cno, false, &root); if (ret) { nilfs_err(s, "error %d while loading snapshot (checkpoint number=%llu)", ret, (unsigned long long)cno); goto out; } ret = nilfs_get_root_dentry(s, root, root_dentry); nilfs_put_root(root); out: mutex_unlock(&nilfs->ns_snapshot_mount_mutex); return ret; } /** * nilfs_tree_is_busy() - try to shrink dentries of a checkpoint * @root_dentry: root dentry of the tree to be shrunk * * This function returns true if the tree was in-use. */ static bool nilfs_tree_is_busy(struct dentry *root_dentry) { shrink_dcache_parent(root_dentry); return d_count(root_dentry) > 1; } int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) { struct the_nilfs *nilfs = sb->s_fs_info; struct nilfs_root *root; struct inode *inode; struct dentry *dentry; int ret; if (cno > nilfs->ns_cno) return false; if (cno >= nilfs_last_cno(nilfs)) return true; /* protect recent checkpoints */ ret = false; root = nilfs_lookup_root(nilfs, cno); if (root) { inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); if (inode) { dentry = d_find_alias(inode); if (dentry) { ret = nilfs_tree_is_busy(dentry); dput(dentry); } iput(inode); } nilfs_put_root(root); } return ret; } /** * nilfs_fill_super() - initialize a super block instance * @sb: super_block * @fc: filesystem context * * This function is called exclusively by nilfs->ns_mount_mutex. * So, the recovery process is protected from other simultaneous mounts. */ static int nilfs_fill_super(struct super_block *sb, struct fs_context *fc) { struct the_nilfs *nilfs; struct nilfs_root *fsroot; struct nilfs_fs_context *ctx = fc->fs_private; __u64 cno; int err; nilfs = alloc_nilfs(sb); if (!nilfs) return -ENOMEM; sb->s_fs_info = nilfs; err = init_nilfs(nilfs, sb); if (err) goto failed_nilfs; /* Copy in parsed mount options */ nilfs->ns_mount_opt = ctx->ns_mount_opt; sb->s_op = &nilfs_sops; sb->s_export_op = &nilfs_export_ops; sb->s_root = NULL; sb->s_time_gran = 1; sb->s_max_links = NILFS_LINK_MAX; sb->s_bdi = bdi_get(sb->s_bdev->bd_disk->bdi); err = load_nilfs(nilfs, sb); if (err) goto failed_nilfs; super_set_uuid(sb, nilfs->ns_sbp[0]->s_uuid, sizeof(nilfs->ns_sbp[0]->s_uuid)); super_set_sysfs_name_bdev(sb); cno = nilfs_last_cno(nilfs); err = nilfs_attach_checkpoint(sb, cno, true, &fsroot); if (err) { nilfs_err(sb, "error %d while loading last checkpoint (checkpoint number=%llu)", err, (unsigned long long)cno); goto failed_unload; } if (!sb_rdonly(sb)) { err = nilfs_attach_log_writer(sb, fsroot); if (err) goto failed_checkpoint; } err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); if (err) goto failed_segctor; nilfs_put_root(fsroot); if (!sb_rdonly(sb)) { down_write(&nilfs->ns_sem); nilfs_setup_super(sb, true); up_write(&nilfs->ns_sem); } return 0; failed_segctor: nilfs_detach_log_writer(sb); failed_checkpoint: nilfs_put_root(fsroot); failed_unload: nilfs_sysfs_delete_device_group(nilfs); iput(nilfs->ns_sufile); iput(nilfs->ns_cpfile); iput(nilfs->ns_dat); failed_nilfs: destroy_nilfs(nilfs); return err; } static int nilfs_reconfigure(struct fs_context *fc) { struct nilfs_fs_context *ctx = fc->fs_private; struct super_block *sb = fc->root->d_sb; struct the_nilfs *nilfs = sb->s_fs_info; int err; sync_filesystem(sb); err = -EINVAL; if (!nilfs_valid_fs(nilfs)) { nilfs_warn(sb, "couldn't remount because the filesystem is in an incomplete recovery state"); goto ignore_opts; } if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb)) goto out; if (fc->sb_flags & SB_RDONLY) { sb->s_flags |= SB_RDONLY; /* * Remounting a valid RW partition RDONLY, so set * the RDONLY flag and then mark the partition as valid again. */ down_write(&nilfs->ns_sem); nilfs_cleanup_super(sb); up_write(&nilfs->ns_sem); } else { __u64 features; struct nilfs_root *root; /* * Mounting a RDONLY partition read-write, so reread and * store the current valid flag. (It may have been changed * by fsck since we originally mounted the partition.) */ down_read(&nilfs->ns_sem); features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & ~NILFS_FEATURE_COMPAT_RO_SUPP; up_read(&nilfs->ns_sem); if (features) { nilfs_warn(sb, "couldn't remount RDWR because of unsupported optional features (%llx)", (unsigned long long)features); err = -EROFS; goto ignore_opts; } sb->s_flags &= ~SB_RDONLY; root = NILFS_I(d_inode(sb->s_root))->i_root; err = nilfs_attach_log_writer(sb, root); if (err) { sb->s_flags |= SB_RDONLY; goto ignore_opts; } down_write(&nilfs->ns_sem); nilfs_setup_super(sb, true); up_write(&nilfs->ns_sem); } out: sb->s_flags = (sb->s_flags & ~SB_POSIXACL); /* Copy over parsed remount options */ nilfs->ns_mount_opt = ctx->ns_mount_opt; return 0; ignore_opts: return err; } static int nilfs_get_tree(struct fs_context *fc) { struct nilfs_fs_context *ctx = fc->fs_private; struct super_block *s; dev_t dev; int err; if (ctx->cno && !(fc->sb_flags & SB_RDONLY)) { nilfs_err(NULL, "invalid option \"cp=%llu\": read-only option is not specified", ctx->cno); return -EINVAL; } err = lookup_bdev(fc->source, &dev); if (err) return err; s = sget_dev(fc, dev); if (IS_ERR(s)) return PTR_ERR(s); if (!s->s_root) { err = setup_bdev_super(s, fc->sb_flags, fc); if (!err) err = nilfs_fill_super(s, fc); if (err) goto failed_super; s->s_flags |= SB_ACTIVE; } else if (!ctx->cno) { if (nilfs_tree_is_busy(s->s_root)) { if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) { nilfs_err(s, "the device already has a %s mount.", sb_rdonly(s) ? "read-only" : "read/write"); err = -EBUSY; goto failed_super; } } else { /* * Try reconfigure to setup mount states if the current * tree is not mounted and only snapshots use this sb. * * Since nilfs_reconfigure() requires fc->root to be * set, set it first and release it on failure. */ fc->root = dget(s->s_root); err = nilfs_reconfigure(fc); if (err) { dput(fc->root); fc->root = NULL; /* prevent double release */ goto failed_super; } return 0; } } if (ctx->cno) { struct dentry *root_dentry; err = nilfs_attach_snapshot(s, ctx->cno, &root_dentry); if (err) goto failed_super; fc->root = root_dentry; return 0; } fc->root = dget(s->s_root); return 0; failed_super: deactivate_locked_super(s); return err; } static void nilfs_free_fc(struct fs_context *fc) { kfree(fc->fs_private); } static const struct fs_context_operations nilfs_context_ops = { .parse_param = nilfs_parse_param, .get_tree = nilfs_get_tree, .reconfigure = nilfs_reconfigure, .free = nilfs_free_fc, }; static int nilfs_init_fs_context(struct fs_context *fc) { struct nilfs_fs_context *ctx; ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); if (!ctx) return -ENOMEM; ctx->ns_mount_opt = NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; fc->fs_private = ctx; fc->ops = &nilfs_context_ops; return 0; } struct file_system_type nilfs_fs_type = { .owner = THIS_MODULE, .name = "nilfs2", .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, .init_fs_context = nilfs_init_fs_context, .parameters = nilfs_param_spec, }; MODULE_ALIAS_FS("nilfs2"); static void nilfs_inode_init_once(void *obj) { struct nilfs_inode_info *ii = obj; INIT_LIST_HEAD(&ii->i_dirty); #ifdef CONFIG_NILFS_XATTR init_rwsem(&ii->xattr_sem); #endif inode_init_once(&ii->vfs_inode); } static void nilfs_segbuf_init_once(void *obj) { memset(obj, 0, sizeof(struct nilfs_segment_buffer)); } static void nilfs_destroy_cachep(void) { /* * Make sure all delayed rcu free inodes are flushed before we * destroy cache. */ rcu_barrier(); kmem_cache_destroy(nilfs_inode_cachep); kmem_cache_destroy(nilfs_transaction_cachep); kmem_cache_destroy(nilfs_segbuf_cachep); kmem_cache_destroy(nilfs_btree_path_cache); } static int __init nilfs_init_cachep(void) { nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", sizeof(struct nilfs_inode_info), 0, SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, nilfs_inode_init_once); if (!nilfs_inode_cachep) goto fail; nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", sizeof(struct nilfs_transaction_info), 0, SLAB_RECLAIM_ACCOUNT, NULL); if (!nilfs_transaction_cachep) goto fail; nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", sizeof(struct nilfs_segment_buffer), 0, SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); if (!nilfs_segbuf_cachep) goto fail; nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, 0, 0, NULL); if (!nilfs_btree_path_cache) goto fail; return 0; fail: nilfs_destroy_cachep(); return -ENOMEM; } static int __init init_nilfs_fs(void) { int err; err = nilfs_init_cachep(); if (err) goto fail; err = nilfs_sysfs_init(); if (err) goto free_cachep; err = register_filesystem(&nilfs_fs_type); if (err) goto deinit_sysfs_entry; printk(KERN_INFO "NILFS version 2 loaded\n"); return 0; deinit_sysfs_entry: nilfs_sysfs_exit(); free_cachep: nilfs_destroy_cachep(); fail: return err; } static void __exit exit_nilfs_fs(void) { nilfs_destroy_cachep(); nilfs_sysfs_exit(); unregister_filesystem(&nilfs_fs_type); } module_init(init_nilfs_fs) module_exit(exit_nilfs_fs)
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