| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Linus Torvalds | 9215 | 50.99% | 24 | 9.80% |
| Andrew Morton | 4294 | 23.76% | 30 | 12.24% |
| Jeff Mahoney | 2463 | 13.63% | 24 | 9.80% |
| Linus Torvalds (pre-git) | 471 | 2.61% | 65 | 26.53% |
| Chris Mason | 295 | 1.63% | 9 | 3.67% |
| Hans Reiser | 212 | 1.17% | 2 | 0.82% |
| Edward Shishkin | 175 | 0.97% | 2 | 0.82% |
| Frédéric Weisbecker | 147 | 0.81% | 7 | 2.86% |
| Oleg Drokin | 144 | 0.80% | 7 | 2.86% |
| Jan Kara | 116 | 0.64% | 8 | 3.27% |
| Christoph Hellwig | 88 | 0.49% | 10 | 4.08% |
| Alexander Zarochentzev | 70 | 0.39% | 1 | 0.41% |
| Al Viro | 45 | 0.25% | 10 | 4.08% |
| Pavel Skripkin | 43 | 0.24% | 1 | 0.41% |
| Eric Sesterhenn / Snakebyte | 39 | 0.22% | 1 | 0.41% |
| David Howells | 32 | 0.18% | 2 | 0.82% |
| zhangyi (F) | 29 | 0.16% | 1 | 0.41% |
| Matthew Wilcox | 26 | 0.14% | 5 | 2.04% |
| Neil Brown | 26 | 0.14% | 1 | 0.41% |
| Pekka J Enberg | 25 | 0.14% | 2 | 0.82% |
| Artem B. Bityutskiy | 14 | 0.08% | 3 | 1.22% |
| Arnd Bergmann | 13 | 0.07% | 1 | 0.41% |
| Tejun Heo | 10 | 0.06% | 1 | 0.41% |
| Fabian Frederick | 10 | 0.06% | 1 | 0.41% |
| Ingo Molnar | 10 | 0.06% | 2 | 0.82% |
| Kees Cook | 8 | 0.04% | 2 | 0.82% |
| Michael Christie | 6 | 0.03% | 2 | 0.82% |
| Adrian Bunk | 5 | 0.03% | 2 | 0.82% |
| Dmitriy Monakhov | 5 | 0.03% | 1 | 0.41% |
| Harvey Harrison | 4 | 0.02% | 1 | 0.41% |
| Nicholas Piggin | 4 | 0.02% | 1 | 0.41% |
| Joe Perches | 3 | 0.02% | 1 | 0.41% |
| Davidlohr Bueso A | 3 | 0.02% | 1 | 0.41% |
| Jens Axboe | 3 | 0.02% | 1 | 0.41% |
| Milind Arun Choudhary | 3 | 0.02% | 1 | 0.41% |
| Andi Kleen | 3 | 0.02% | 1 | 0.41% |
| Jesper Juhl | 2 | 0.01% | 1 | 0.41% |
| Akinobu Mita | 2 | 0.01% | 1 | 0.41% |
| Hariprasad Kelam | 2 | 0.01% | 1 | 0.41% |
| Bharath Vedartham | 1 | 0.01% | 1 | 0.41% |
| Randy Dunlap | 1 | 0.01% | 1 | 0.41% |
| Greg Kroah-Hartman | 1 | 0.01% | 1 | 0.41% |
| Masanari Iida | 1 | 0.01% | 1 | 0.41% |
| Dave Jones | 1 | 0.01% | 1 | 0.41% |
| Colin Ian King | 1 | 0.01% | 1 | 0.41% |
| Nishanth Aravamudan | 1 | 0.01% | 1 | 0.41% |
| Kirill A. Shutemov | 1 | 0.01% | 1 | 0.41% |
| Total | 18073 | 245 |
// SPDX-License-Identifier: GPL-2.0 /* * Write ahead logging implementation copyright Chris Mason 2000 * * The background commits make this code very interrelated, and * overly complex. I need to rethink things a bit....The major players: * * journal_begin -- call with the number of blocks you expect to log. * If the current transaction is too * old, it will block until the current transaction is * finished, and then start a new one. * Usually, your transaction will get joined in with * previous ones for speed. * * journal_join -- same as journal_begin, but won't block on the current * transaction regardless of age. Don't ever call * this. Ever. There are only two places it should be * called from, and they are both inside this file. * * journal_mark_dirty -- adds blocks into this transaction. clears any flags * that might make them get sent to disk * and then marks them BH_JDirty. Puts the buffer head * into the current transaction hash. * * journal_end -- if the current transaction is batchable, it does nothing * otherwise, it could do an async/synchronous commit, or * a full flush of all log and real blocks in the * transaction. * * flush_old_commits -- if the current transaction is too old, it is ended and * commit blocks are sent to disk. Forces commit blocks * to disk for all backgrounded commits that have been * around too long. * -- Note, if you call this as an immediate flush from * within kupdate, it will ignore the immediate flag */ #include <linux/time.h> #include <linux/semaphore.h> #include <linux/vmalloc.h> #include "reiserfs.h" #include <linux/kernel.h> #include <linux/errno.h> #include <linux/fcntl.h> #include <linux/stat.h> #include <linux/string.h> #include <linux/buffer_head.h> #include <linux/workqueue.h> #include <linux/writeback.h> #include <linux/blkdev.h> #include <linux/backing-dev.h> #include <linux/uaccess.h> #include <linux/slab.h> /* gets a struct reiserfs_journal_list * from a list head */ #define JOURNAL_LIST_ENTRY(h) (list_entry((h), struct reiserfs_journal_list, \ j_list)) /* must be correct to keep the desc and commit structs at 4k */ #define JOURNAL_TRANS_HALF 1018 #define BUFNR 64 /*read ahead */ /* cnode stat bits. Move these into reiserfs_fs.h */ /* this block was freed, and can't be written. */ #define BLOCK_FREED 2 /* this block was freed during this transaction, and can't be written */ #define BLOCK_FREED_HOLDER 3 /* used in flush_journal_list */ #define BLOCK_NEEDS_FLUSH 4 #define BLOCK_DIRTIED 5 /* journal list state bits */ #define LIST_TOUCHED 1 #define LIST_DIRTY 2 #define LIST_COMMIT_PENDING 4 /* someone will commit this list */ /* flags for do_journal_end */ #define FLUSH_ALL 1 /* flush commit and real blocks */ #define COMMIT_NOW 2 /* end and commit this transaction */ #define WAIT 4 /* wait for the log blocks to hit the disk */ static int do_journal_end(struct reiserfs_transaction_handle *, int flags); static int flush_journal_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall); static int flush_commit_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall); static int can_dirty(struct reiserfs_journal_cnode *cn); static int journal_join(struct reiserfs_transaction_handle *th, struct super_block *sb); static void release_journal_dev(struct reiserfs_journal *journal); static void dirty_one_transaction(struct super_block *s, struct reiserfs_journal_list *jl); static void flush_async_commits(struct work_struct *work); static void queue_log_writer(struct super_block *s); /* values for join in do_journal_begin_r */ enum { JBEGIN_REG = 0, /* regular journal begin */ /* join the running transaction if at all possible */ JBEGIN_JOIN = 1, /* called from cleanup code, ignores aborted flag */ JBEGIN_ABORT = 2, }; static int do_journal_begin_r(struct reiserfs_transaction_handle *th, struct super_block *sb, unsigned long nblocks, int join); static void init_journal_hash(struct super_block *sb) { struct reiserfs_journal *journal = SB_JOURNAL(sb); memset(journal->j_hash_table, 0, JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)); } /* * clears BH_Dirty and sticks the buffer on the clean list. Called because * I can't allow refile_buffer to make schedule happen after I've freed a * block. Look at remove_from_transaction and journal_mark_freed for * more details. */ static int reiserfs_clean_and_file_buffer(struct buffer_head *bh) { if (bh) { clear_buffer_dirty(bh); clear_buffer_journal_test(bh); } return 0; } static struct reiserfs_bitmap_node *allocate_bitmap_node(struct super_block *sb) { struct reiserfs_bitmap_node *bn; static int id; bn = kmalloc(sizeof(struct reiserfs_bitmap_node), GFP_NOFS); if (!bn) { return NULL; } bn->data = kzalloc(sb->s_blocksize, GFP_NOFS); if (!bn->data) { kfree(bn); return NULL; } bn->id = id++; INIT_LIST_HEAD(&bn->list); return bn; } static struct reiserfs_bitmap_node *get_bitmap_node(struct super_block *sb) { struct reiserfs_journal *journal = SB_JOURNAL(sb); struct reiserfs_bitmap_node *bn = NULL; struct list_head *entry = journal->j_bitmap_nodes.next; journal->j_used_bitmap_nodes++; repeat: if (entry != &journal->j_bitmap_nodes) { bn = list_entry(entry, struct reiserfs_bitmap_node, list); list_del(entry); memset(bn->data, 0, sb->s_blocksize); journal->j_free_bitmap_nodes--; return bn; } bn = allocate_bitmap_node(sb); if (!bn) { yield(); goto repeat; } return bn; } static inline void free_bitmap_node(struct super_block *sb, struct reiserfs_bitmap_node *bn) { struct reiserfs_journal *journal = SB_JOURNAL(sb); journal->j_used_bitmap_nodes--; if (journal->j_free_bitmap_nodes > REISERFS_MAX_BITMAP_NODES) { kfree(bn->data); kfree(bn); } else { list_add(&bn->list, &journal->j_bitmap_nodes); journal->j_free_bitmap_nodes++; } } static void allocate_bitmap_nodes(struct super_block *sb) { int i; struct reiserfs_journal *journal = SB_JOURNAL(sb); struct reiserfs_bitmap_node *bn = NULL; for (i = 0; i < REISERFS_MIN_BITMAP_NODES; i++) { bn = allocate_bitmap_node(sb); if (bn) { list_add(&bn->list, &journal->j_bitmap_nodes); journal->j_free_bitmap_nodes++; } else { /* this is ok, we'll try again when more are needed */ break; } } } static int set_bit_in_list_bitmap(struct super_block *sb, b_blocknr_t block, struct reiserfs_list_bitmap *jb) { unsigned int bmap_nr = block / (sb->s_blocksize << 3); unsigned int bit_nr = block % (sb->s_blocksize << 3); if (!jb->bitmaps[bmap_nr]) { jb->bitmaps[bmap_nr] = get_bitmap_node(sb); } set_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data); return 0; } static void cleanup_bitmap_list(struct super_block *sb, struct reiserfs_list_bitmap *jb) { int i; if (jb->bitmaps == NULL) return; for (i = 0; i < reiserfs_bmap_count(sb); i++) { if (jb->bitmaps[i]) { free_bitmap_node(sb, jb->bitmaps[i]); jb->bitmaps[i] = NULL; } } } /* * only call this on FS unmount. */ static int free_list_bitmaps(struct super_block *sb, struct reiserfs_list_bitmap *jb_array) { int i; struct reiserfs_list_bitmap *jb; for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { jb = jb_array + i; jb->journal_list = NULL; cleanup_bitmap_list(sb, jb); vfree(jb->bitmaps); jb->bitmaps = NULL; } return 0; } static int free_bitmap_nodes(struct super_block *sb) { struct reiserfs_journal *journal = SB_JOURNAL(sb); struct list_head *next = journal->j_bitmap_nodes.next; struct reiserfs_bitmap_node *bn; while (next != &journal->j_bitmap_nodes) { bn = list_entry(next, struct reiserfs_bitmap_node, list); list_del(next); kfree(bn->data); kfree(bn); next = journal->j_bitmap_nodes.next; journal->j_free_bitmap_nodes--; } return 0; } /* * get memory for JOURNAL_NUM_BITMAPS worth of bitmaps. * jb_array is the array to be filled in. */ int reiserfs_allocate_list_bitmaps(struct super_block *sb, struct reiserfs_list_bitmap *jb_array, unsigned int bmap_nr) { int i; int failed = 0; struct reiserfs_list_bitmap *jb; int mem = bmap_nr * sizeof(struct reiserfs_bitmap_node *); for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { jb = jb_array + i; jb->journal_list = NULL; jb->bitmaps = vzalloc(mem); if (!jb->bitmaps) { reiserfs_warning(sb, "clm-2000", "unable to " "allocate bitmaps for journal lists"); failed = 1; break; } } if (failed) { free_list_bitmaps(sb, jb_array); return -1; } return 0; } /* * find an available list bitmap. If you can't find one, flush a commit list * and try again */ static struct reiserfs_list_bitmap *get_list_bitmap(struct super_block *sb, struct reiserfs_journal_list *jl) { int i, j; struct reiserfs_journal *journal = SB_JOURNAL(sb); struct reiserfs_list_bitmap *jb = NULL; for (j = 0; j < (JOURNAL_NUM_BITMAPS * 3); j++) { i = journal->j_list_bitmap_index; journal->j_list_bitmap_index = (i + 1) % JOURNAL_NUM_BITMAPS; jb = journal->j_list_bitmap + i; if (journal->j_list_bitmap[i].journal_list) { flush_commit_list(sb, journal->j_list_bitmap[i]. journal_list, 1); if (!journal->j_list_bitmap[i].journal_list) { break; } } else { break; } } /* double check to make sure if flushed correctly */ if (jb->journal_list) return NULL; jb->journal_list = jl; return jb; } /* * allocates a new chunk of X nodes, and links them all together as a list. * Uses the cnode->next and cnode->prev pointers * returns NULL on failure */ static struct reiserfs_journal_cnode *allocate_cnodes(int num_cnodes) { struct reiserfs_journal_cnode *head; int i; if (num_cnodes <= 0) { return NULL; } head = vzalloc(array_size(num_cnodes, sizeof(struct reiserfs_journal_cnode))); if (!head) { return NULL; } head[0].prev = NULL; head[0].next = head + 1; for (i = 1; i < num_cnodes; i++) { head[i].prev = head + (i - 1); head[i].next = head + (i + 1); /* if last one, overwrite it after the if */ } head[num_cnodes - 1].next = NULL; return head; } /* pulls a cnode off the free list, or returns NULL on failure */ static struct reiserfs_journal_cnode *get_cnode(struct super_block *sb) { struct reiserfs_journal_cnode *cn; struct reiserfs_journal *journal = SB_JOURNAL(sb); reiserfs_check_lock_depth(sb, "get_cnode"); if (journal->j_cnode_free <= 0) { return NULL; } journal->j_cnode_used++; journal->j_cnode_free--; cn = journal->j_cnode_free_list; if (!cn) { return cn; } if (cn->next) { cn->next->prev = NULL; } journal->j_cnode_free_list = cn->next; memset(cn, 0, sizeof(struct reiserfs_journal_cnode)); return cn; } /* * returns a cnode to the free list */ static void free_cnode(struct super_block *sb, struct reiserfs_journal_cnode *cn) { struct reiserfs_journal *journal = SB_JOURNAL(sb); reiserfs_check_lock_depth(sb, "free_cnode"); journal->j_cnode_used--; journal->j_cnode_free++; /* memset(cn, 0, sizeof(struct reiserfs_journal_cnode)) ; */ cn->next = journal->j_cnode_free_list; if (journal->j_cnode_free_list) { journal->j_cnode_free_list->prev = cn; } cn->prev = NULL; /* not needed with the memset, but I might kill the memset, and forget to do this */ journal->j_cnode_free_list = cn; } static void clear_prepared_bits(struct buffer_head *bh) { clear_buffer_journal_prepared(bh); clear_buffer_journal_restore_dirty(bh); } /* * return a cnode with same dev, block number and size in table, * or null if not found */ static inline struct reiserfs_journal_cnode *get_journal_hash_dev(struct super_block *sb, struct reiserfs_journal_cnode **table, long bl) { struct reiserfs_journal_cnode *cn; cn = journal_hash(table, sb, bl); while (cn) { if (cn->blocknr == bl && cn->sb == sb) return cn; cn = cn->hnext; } return (struct reiserfs_journal_cnode *)0; } /* * this actually means 'can this block be reallocated yet?'. If you set * search_all, a block can only be allocated if it is not in the current * transaction, was not freed by the current transaction, and has no chance * of ever being overwritten by a replay after crashing. * * If you don't set search_all, a block can only be allocated if it is not * in the current transaction. Since deleting a block removes it from the * current transaction, this case should never happen. If you don't set * search_all, make sure you never write the block without logging it. * * next_zero_bit is a suggestion about the next block to try for find_forward. * when bl is rejected because it is set in a journal list bitmap, we search * for the next zero bit in the bitmap that rejected bl. Then, we return * that through next_zero_bit for find_forward to try. * * Just because we return something in next_zero_bit does not mean we won't * reject it on the next call to reiserfs_in_journal */ int reiserfs_in_journal(struct super_block *sb, unsigned int bmap_nr, int bit_nr, int search_all, b_blocknr_t * next_zero_bit) { struct reiserfs_journal *journal = SB_JOURNAL(sb); struct reiserfs_list_bitmap *jb; int i; unsigned long bl; *next_zero_bit = 0; /* always start this at zero. */ PROC_INFO_INC(sb, journal.in_journal); /* * If we aren't doing a search_all, this is a metablock, and it * will be logged before use. if we crash before the transaction * that freed it commits, this transaction won't have committed * either, and the block will never be written */ if (search_all) { for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) { PROC_INFO_INC(sb, journal.in_journal_bitmap); jb = journal->j_list_bitmap + i; if (jb->journal_list && jb->bitmaps[bmap_nr] && test_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]-> data)) { *next_zero_bit = find_next_zero_bit((unsigned long *) (jb->bitmaps[bmap_nr]-> data), sb->s_blocksize << 3, bit_nr + 1); return 1; } } } bl = bmap_nr * (sb->s_blocksize << 3) + bit_nr; /* is it in any old transactions? */ if (search_all && (get_journal_hash_dev(sb, journal->j_list_hash_table, bl))) { return 1; } /* is it in the current transaction. This should never happen */ if ((get_journal_hash_dev(sb, journal->j_hash_table, bl))) { BUG(); return 1; } PROC_INFO_INC(sb, journal.in_journal_reusable); /* safe for reuse */ return 0; } /* insert cn into table */ static inline void insert_journal_hash(struct reiserfs_journal_cnode **table, struct reiserfs_journal_cnode *cn) { struct reiserfs_journal_cnode *cn_orig; cn_orig = journal_hash(table, cn->sb, cn->blocknr); cn->hnext = cn_orig; cn->hprev = NULL; if (cn_orig) { cn_orig->hprev = cn; } journal_hash(table, cn->sb, cn->blocknr) = cn; } /* lock the current transaction */ static inline void lock_journal(struct super_block *sb) { PROC_INFO_INC(sb, journal.lock_journal); reiserfs_mutex_lock_safe(&SB_JOURNAL(sb)->j_mutex, sb); } /* unlock the current transaction */ static inline void unlock_journal(struct super_block *sb) { mutex_unlock(&SB_JOURNAL(sb)->j_mutex); } static inline void get_journal_list(struct reiserfs_journal_list *jl) { jl->j_refcount++; } static inline void put_journal_list(struct super_block *s, struct reiserfs_journal_list *jl) { if (jl->j_refcount < 1) { reiserfs_panic(s, "journal-2", "trans id %u, refcount at %d", jl->j_trans_id, jl->j_refcount); } if (--jl->j_refcount == 0) kfree(jl); } /* * this used to be much more involved, and I'm keeping it just in case * things get ugly again. it gets called by flush_commit_list, and * cleans up any data stored about blocks freed during a transaction. */ static void cleanup_freed_for_journal_list(struct super_block *sb, struct reiserfs_journal_list *jl) { struct reiserfs_list_bitmap *jb = jl->j_list_bitmap; if (jb) { cleanup_bitmap_list(sb, jb); } jl->j_list_bitmap->journal_list = NULL; jl->j_list_bitmap = NULL; } static int journal_list_still_alive(struct super_block *s, unsigned int trans_id) { struct reiserfs_journal *journal = SB_JOURNAL(s); struct list_head *entry = &journal->j_journal_list; struct reiserfs_journal_list *jl; if (!list_empty(entry)) { jl = JOURNAL_LIST_ENTRY(entry->next); if (jl->j_trans_id <= trans_id) { return 1; } } return 0; } /* * If page->mapping was null, we failed to truncate this page for * some reason. Most likely because it was truncated after being * logged via data=journal. * * This does a check to see if the buffer belongs to one of these * lost pages before doing the final put_bh. If page->mapping was * null, it tries to free buffers on the page, which should make the * final put_page drop the page from the lru. */ static void release_buffer_page(struct buffer_head *bh) { struct folio *folio = bh->b_folio; if (!folio->mapping && folio_trylock(folio)) { folio_get(folio); put_bh(bh); if (!folio->mapping) try_to_free_buffers(folio); folio_unlock(folio); folio_put(folio); } else { put_bh(bh); } } static void reiserfs_end_buffer_io_sync(struct buffer_head *bh, int uptodate) { if (buffer_journaled(bh)) { reiserfs_warning(NULL, "clm-2084", "pinned buffer %lu:%pg sent to disk", bh->b_blocknr, bh->b_bdev); } if (uptodate) set_buffer_uptodate(bh); else clear_buffer_uptodate(bh); unlock_buffer(bh); release_buffer_page(bh); } static void reiserfs_end_ordered_io(struct buffer_head *bh, int uptodate) { if (uptodate) set_buffer_uptodate(bh); else clear_buffer_uptodate(bh); unlock_buffer(bh); put_bh(bh); } static void submit_logged_buffer(struct buffer_head *bh) { get_bh(bh); bh->b_end_io = reiserfs_end_buffer_io_sync; clear_buffer_journal_new(bh); clear_buffer_dirty(bh); if (!test_clear_buffer_journal_test(bh)) BUG(); if (!buffer_uptodate(bh)) BUG(); submit_bh(REQ_OP_WRITE, bh); } static void submit_ordered_buffer(struct buffer_head *bh) { get_bh(bh); bh->b_end_io = reiserfs_end_ordered_io; clear_buffer_dirty(bh); if (!buffer_uptodate(bh)) BUG(); submit_bh(REQ_OP_WRITE, bh); } #define CHUNK_SIZE 32 struct buffer_chunk { struct buffer_head *bh[CHUNK_SIZE]; int nr; }; static void write_chunk(struct buffer_chunk *chunk) { int i; for (i = 0; i < chunk->nr; i++) { submit_logged_buffer(chunk->bh[i]); } chunk->nr = 0; } static void write_ordered_chunk(struct buffer_chunk *chunk) { int i; for (i = 0; i < chunk->nr; i++) { submit_ordered_buffer(chunk->bh[i]); } chunk->nr = 0; } static int add_to_chunk(struct buffer_chunk *chunk, struct buffer_head *bh, spinlock_t * lock, void (fn) (struct buffer_chunk *)) { int ret = 0; BUG_ON(chunk->nr >= CHUNK_SIZE); chunk->bh[chunk->nr++] = bh; if (chunk->nr >= CHUNK_SIZE) { ret = 1; if (lock) { spin_unlock(lock); fn(chunk); spin_lock(lock); } else { fn(chunk); } } return ret; } static atomic_t nr_reiserfs_jh = ATOMIC_INIT(0); static struct reiserfs_jh *alloc_jh(void) { struct reiserfs_jh *jh; while (1) { jh = kmalloc(sizeof(*jh), GFP_NOFS); if (jh) { atomic_inc(&nr_reiserfs_jh); return jh; } yield(); } } /* * we want to free the jh when the buffer has been written * and waited on */ void reiserfs_free_jh(struct buffer_head *bh) { struct reiserfs_jh *jh; jh = bh->b_private; if (jh) { bh->b_private = NULL; jh->bh = NULL; list_del_init(&jh->list); kfree(jh); if (atomic_read(&nr_reiserfs_jh) <= 0) BUG(); atomic_dec(&nr_reiserfs_jh); put_bh(bh); } } static inline int __add_jh(struct reiserfs_journal *j, struct buffer_head *bh, int tail) { struct reiserfs_jh *jh; if (bh->b_private) { spin_lock(&j->j_dirty_buffers_lock); if (!bh->b_private) { spin_unlock(&j->j_dirty_buffers_lock); goto no_jh; } jh = bh->b_private; list_del_init(&jh->list); } else { no_jh: get_bh(bh); jh = alloc_jh(); spin_lock(&j->j_dirty_buffers_lock); /* * buffer must be locked for __add_jh, should be able to have * two adds at the same time */ BUG_ON(bh->b_private); jh->bh = bh; bh->b_private = jh; } jh->jl = j->j_current_jl; if (tail) list_add_tail(&jh->list, &jh->jl->j_tail_bh_list); else { list_add_tail(&jh->list, &jh->jl->j_bh_list); } spin_unlock(&j->j_dirty_buffers_lock); return 0; } int reiserfs_add_tail_list(struct inode *inode, struct buffer_head *bh) { return __add_jh(SB_JOURNAL(inode->i_sb), bh, 1); } int reiserfs_add_ordered_list(struct inode *inode, struct buffer_head *bh) { return __add_jh(SB_JOURNAL(inode->i_sb), bh, 0); } #define JH_ENTRY(l) list_entry((l), struct reiserfs_jh, list) static int write_ordered_buffers(spinlock_t * lock, struct reiserfs_journal *j, struct reiserfs_journal_list *jl, struct list_head *list) { struct buffer_head *bh; struct reiserfs_jh *jh; int ret = j->j_errno; struct buffer_chunk chunk; struct list_head tmp; INIT_LIST_HEAD(&tmp); chunk.nr = 0; spin_lock(lock); while (!list_empty(list)) { jh = JH_ENTRY(list->next); bh = jh->bh; get_bh(bh); if (!trylock_buffer(bh)) { if (!buffer_dirty(bh)) { list_move(&jh->list, &tmp); goto loop_next; } spin_unlock(lock); if (chunk.nr) write_ordered_chunk(&chunk); wait_on_buffer(bh); cond_resched(); spin_lock(lock); goto loop_next; } /* * in theory, dirty non-uptodate buffers should never get here, * but the upper layer io error paths still have a few quirks. * Handle them here as gracefully as we can */ if (!buffer_uptodate(bh) && buffer_dirty(bh)) { clear_buffer_dirty(bh); ret = -EIO; } if (buffer_dirty(bh)) { list_move(&jh->list, &tmp); add_to_chunk(&chunk, bh, lock, write_ordered_chunk); } else { reiserfs_free_jh(bh); unlock_buffer(bh); } loop_next: put_bh(bh); cond_resched_lock(lock); } if (chunk.nr) { spin_unlock(lock); write_ordered_chunk(&chunk); spin_lock(lock); } while (!list_empty(&tmp)) { jh = JH_ENTRY(tmp.prev); bh = jh->bh; get_bh(bh); reiserfs_free_jh(bh); if (buffer_locked(bh)) { spin_unlock(lock); wait_on_buffer(bh); spin_lock(lock); } if (!buffer_uptodate(bh)) { ret = -EIO; } /* * ugly interaction with invalidate_folio here. * reiserfs_invalidate_folio will pin any buffer that has a * valid journal head from an older transaction. If someone * else sets our buffer dirty after we write it in the first * loop, and then someone truncates the page away, nobody * will ever write the buffer. We're safe if we write the * page one last time after freeing the journal header. */ if (buffer_dirty(bh) && unlikely(bh->b_folio->mapping == NULL)) { spin_unlock(lock); write_dirty_buffer(bh, 0); spin_lock(lock); } put_bh(bh); cond_resched_lock(lock); } spin_unlock(lock); return ret; } static int flush_older_commits(struct super_block *s, struct reiserfs_journal_list *jl) { struct reiserfs_journal *journal = SB_JOURNAL(s); struct reiserfs_journal_list *other_jl; struct reiserfs_journal_list *first_jl; struct list_head *entry; unsigned int trans_id = jl->j_trans_id; unsigned int other_trans_id; find_first: /* * first we walk backwards to find the oldest uncommitted transation */ first_jl = jl; entry = jl->j_list.prev; while (1) { other_jl = JOURNAL_LIST_ENTRY(entry); if (entry == &journal->j_journal_list || atomic_read(&other_jl->j_older_commits_done)) break; first_jl = other_jl; entry = other_jl->j_list.prev; } /* if we didn't find any older uncommitted transactions, return now */ if (first_jl == jl) { return 0; } entry = &first_jl->j_list; while (1) { other_jl = JOURNAL_LIST_ENTRY(entry); other_trans_id = other_jl->j_trans_id; if (other_trans_id < trans_id) { if (atomic_read(&other_jl->j_commit_left) != 0) { flush_commit_list(s, other_jl, 0); /* list we were called with is gone, return */ if (!journal_list_still_alive(s, trans_id)) return 1; /* * the one we just flushed is gone, this means * all older lists are also gone, so first_jl * is no longer valid either. Go back to the * beginning. */ if (!journal_list_still_alive (s, other_trans_id)) { goto find_first; } } entry = entry->next; if (entry == &journal->j_journal_list) return 0; } else { return 0; } } return 0; } static int reiserfs_async_progress_wait(struct super_block *s) { struct reiserfs_journal *j = SB_JOURNAL(s); if (atomic_read(&j->j_async_throttle)) { int depth; depth = reiserfs_write_unlock_nested(s); wait_var_event_timeout(&j->j_async_throttle, atomic_read(&j->j_async_throttle) == 0, HZ / 10); reiserfs_write_lock_nested(s, depth); } return 0; } /* * if this journal list still has commit blocks unflushed, send them to disk. * * log areas must be flushed in order (transaction 2 can't commit before * transaction 1) Before the commit block can by written, every other log * block must be safely on disk */ static int flush_commit_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) { int i; b_blocknr_t bn; struct buffer_head *tbh = NULL; unsigned int trans_id = jl->j_trans_id; struct reiserfs_journal *journal = SB_JOURNAL(s); int retval = 0; int write_len; int depth; reiserfs_check_lock_depth(s, "flush_commit_list"); if (atomic_read(&jl->j_older_commits_done)) { return 0; } /* * before we can put our commit blocks on disk, we have to make * sure everyone older than us is on disk too */ BUG_ON(jl->j_len <= 0); BUG_ON(trans_id == journal->j_trans_id); get_journal_list(jl); if (flushall) { if (flush_older_commits(s, jl) == 1) { /* * list disappeared during flush_older_commits. * return */ goto put_jl; } } /* make sure nobody is trying to flush this one at the same time */ reiserfs_mutex_lock_safe(&jl->j_commit_mutex, s); if (!journal_list_still_alive(s, trans_id)) { mutex_unlock(&jl->j_commit_mutex); goto put_jl; } BUG_ON(jl->j_trans_id == 0); /* this commit is done, exit */ if (atomic_read(&jl->j_commit_left) <= 0) { if (flushall) { atomic_set(&jl->j_older_commits_done, 1); } mutex_unlock(&jl->j_commit_mutex); goto put_jl; } if (!list_empty(&jl->j_bh_list)) { int ret; /* * We might sleep in numerous places inside * write_ordered_buffers. Relax the write lock. */ depth = reiserfs_write_unlock_nested(s); ret = write_ordered_buffers(&journal->j_dirty_buffers_lock, journal, jl, &jl->j_bh_list); if (ret < 0 && retval == 0) retval = ret; reiserfs_write_lock_nested(s, depth); } BUG_ON(!list_empty(&jl->j_bh_list)); /* * for the description block and all the log blocks, submit any buffers * that haven't already reached the disk. Try to write at least 256 * log blocks. later on, we will only wait on blocks that correspond * to this transaction, but while we're unplugging we might as well * get a chunk of data on there. */ atomic_inc(&journal->j_async_throttle); write_len = jl->j_len + 1; if (write_len < 256) write_len = 256; for (i = 0 ; i < write_len ; i++) { bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s); tbh = journal_find_get_block(s, bn); if (tbh) { if (buffer_dirty(tbh)) { depth = reiserfs_write_unlock_nested(s); write_dirty_buffer(tbh, 0); reiserfs_write_lock_nested(s, depth); } put_bh(tbh) ; } } if (atomic_dec_and_test(&journal->j_async_throttle)) wake_up_var(&journal->j_async_throttle); for (i = 0; i < (jl->j_len + 1); i++) { bn = SB_ONDISK_JOURNAL_1st_BLOCK(s) + (jl->j_start + i) % SB_ONDISK_JOURNAL_SIZE(s); tbh = journal_find_get_block(s, bn); depth = reiserfs_write_unlock_nested(s); __wait_on_buffer(tbh); reiserfs_write_lock_nested(s, depth); /* * since we're using ll_rw_blk above, it might have skipped * over a locked buffer. Double check here */ /* redundant, sync_dirty_buffer() checks */ if (buffer_dirty(tbh)) { depth = reiserfs_write_unlock_nested(s); sync_dirty_buffer(tbh); reiserfs_write_lock_nested(s, depth); } if (unlikely(!buffer_uptodate(tbh))) { #ifdef CONFIG_REISERFS_CHECK reiserfs_warning(s, "journal-601", "buffer write failed"); #endif retval = -EIO; } /* once for journal_find_get_block */ put_bh(tbh); /* once due to original getblk in do_journal_end */ put_bh(tbh); atomic_dec(&jl->j_commit_left); } BUG_ON(atomic_read(&jl->j_commit_left) != 1); /* * If there was a write error in the journal - we can't commit * this transaction - it will be invalid and, if successful, * will just end up propagating the write error out to * the file system. */ if (likely(!retval && !reiserfs_is_journal_aborted (journal))) { if (buffer_dirty(jl->j_commit_bh)) BUG(); mark_buffer_dirty(jl->j_commit_bh) ; depth = reiserfs_write_unlock_nested(s); if (reiserfs_barrier_flush(s)) __sync_dirty_buffer(jl->j_commit_bh, REQ_SYNC | REQ_PREFLUSH | REQ_FUA); else sync_dirty_buffer(jl->j_commit_bh); reiserfs_write_lock_nested(s, depth); } /* * If there was a write error in the journal - we can't commit this * transaction - it will be invalid and, if successful, will just end * up propagating the write error out to the filesystem. */ if (unlikely(!buffer_uptodate(jl->j_commit_bh))) { #ifdef CONFIG_REISERFS_CHECK reiserfs_warning(s, "journal-615", "buffer write failed"); #endif retval = -EIO; } bforget(jl->j_commit_bh); if (journal->j_last_commit_id != 0 && (jl->j_trans_id - journal->j_last_commit_id) != 1) { reiserfs_warning(s, "clm-2200", "last commit %lu, current %lu", journal->j_last_commit_id, jl->j_trans_id); } journal->j_last_commit_id = jl->j_trans_id; /* * now, every commit block is on the disk. It is safe to allow * blocks freed during this transaction to be reallocated */ cleanup_freed_for_journal_list(s, jl); retval = retval ? retval : journal->j_errno; /* mark the metadata dirty */ if (!retval) dirty_one_transaction(s, jl); atomic_dec(&jl->j_commit_left); if (flushall) { atomic_set(&jl->j_older_commits_done, 1); } mutex_unlock(&jl->j_commit_mutex); put_jl: put_journal_list(s, jl); if (retval) reiserfs_abort(s, retval, "Journal write error in %s", __func__); return retval; } /* * flush_journal_list frequently needs to find a newer transaction for a * given block. This does that, or returns NULL if it can't find anything */ static struct reiserfs_journal_list *find_newer_jl_for_cn(struct reiserfs_journal_cnode *cn) { struct super_block *sb = cn->sb; b_blocknr_t blocknr = cn->blocknr; cn = cn->hprev; while (cn) { if (cn->sb == sb && cn->blocknr == blocknr && cn->jlist) { return cn->jlist; } cn = cn->hprev; } return NULL; } static void remove_journal_hash(struct super_block *, struct reiserfs_journal_cnode **, struct reiserfs_journal_list *, unsigned long, int); /* * once all the real blocks have been flushed, it is safe to remove them * from the journal list for this transaction. Aside from freeing the * cnode, this also allows the block to be reallocated for data blocks * if it had been deleted. */ static void remove_all_from_journal_list(struct super_block *sb, struct reiserfs_journal_list *jl, int debug) { struct reiserfs_journal *journal = SB_JOURNAL(sb); struct reiserfs_journal_cnode *cn, *last; cn = jl->j_realblock; /* * which is better, to lock once around the whole loop, or * to lock for each call to remove_journal_hash? */ while (cn) { if (cn->blocknr != 0) { if (debug) { reiserfs_warning(sb, "reiserfs-2201", "block %u, bh is %d, state %ld", cn->blocknr, cn->bh ? 1 : 0, cn->state); } cn->state = 0; remove_journal_hash(sb, journal->j_list_hash_table, jl, cn->blocknr, 1); } last = cn; cn = cn->next; free_cnode(sb, last); } jl->j_realblock = NULL; } /* * if this timestamp is greater than the timestamp we wrote last to the * header block, write it to the header block. once this is done, I can * safely say the log area for this transaction won't ever be replayed, * and I can start releasing blocks in this transaction for reuse as data * blocks. called by flush_journal_list, before it calls * remove_all_from_journal_list */ static int _update_journal_header_block(struct super_block *sb, unsigned long offset, unsigned int trans_id) { struct reiserfs_journal_header *jh; struct reiserfs_journal *journal = SB_JOURNAL(sb); int depth; if (reiserfs_is_journal_aborted(journal)) return -EIO; if (trans_id >= journal->j_last_flush_trans_id) { if (buffer_locked((journal->j_header_bh))) { depth = reiserfs_write_unlock_nested(sb); __wait_on_buffer(journal->j_header_bh); reiserfs_write_lock_nested(sb, depth); if (unlikely(!buffer_uptodate(journal->j_header_bh))) { #ifdef CONFIG_REISERFS_CHECK reiserfs_warning(sb, "journal-699", "buffer write failed"); #endif return -EIO; } } journal->j_last_flush_trans_id = trans_id; journal->j_first_unflushed_offset = offset; jh = (struct reiserfs_journal_header *)(journal->j_header_bh-> b_data); jh->j_last_flush_trans_id = cpu_to_le32(trans_id); jh->j_first_unflushed_offset = cpu_to_le32(offset); jh->j_mount_id = cpu_to_le32(journal->j_mount_id); set_buffer_dirty(journal->j_header_bh); depth = reiserfs_write_unlock_nested(sb); if (reiserfs_barrier_flush(sb)) __sync_dirty_buffer(journal->j_header_bh, REQ_SYNC | REQ_PREFLUSH | REQ_FUA); else sync_dirty_buffer(journal->j_header_bh); reiserfs_write_lock_nested(sb, depth); if (!buffer_uptodate(journal->j_header_bh)) { reiserfs_warning(sb, "journal-837", "IO error during journal replay"); return -EIO; } } return 0; } static int update_journal_header_block(struct super_block *sb, unsigned long offset, unsigned int trans_id) { return _update_journal_header_block(sb, offset, trans_id); } /* ** flush any and all journal lists older than you are ** can only be called from flush_journal_list */ static int flush_older_journal_lists(struct super_block *sb, struct reiserfs_journal_list *jl) { struct list_head *entry; struct reiserfs_journal_list *other_jl; struct reiserfs_journal *journal = SB_JOURNAL(sb); unsigned int trans_id = jl->j_trans_id; /* * we know we are the only ones flushing things, no extra race * protection is required. */ restart: entry = journal->j_journal_list.next; /* Did we wrap? */ if (entry == &journal->j_journal_list) return 0; other_jl = JOURNAL_LIST_ENTRY(entry); if (other_jl->j_trans_id < trans_id) { BUG_ON(other_jl->j_refcount <= 0); /* do not flush all */ flush_journal_list(sb, other_jl, 0); /* other_jl is now deleted from the list */ goto restart; } return 0; } static void del_from_work_list(struct super_block *s, struct reiserfs_journal_list *jl) { struct reiserfs_journal *journal = SB_JOURNAL(s); if (!list_empty(&jl->j_working_list)) { list_del_init(&jl->j_working_list); journal->j_num_work_lists--; } } /* * flush a journal list, both commit and real blocks * * always set flushall to 1, unless you are calling from inside * flush_journal_list * * IMPORTANT. This can only be called while there are no journal writers, * and the journal is locked. That means it can only be called from * do_journal_end, or by journal_release */ static int flush_journal_list(struct super_block *s, struct reiserfs_journal_list *jl, int flushall) { struct reiserfs_journal_list *pjl; struct reiserfs_journal_cnode *cn; int count; int was_jwait = 0; int was_dirty = 0; struct buffer_head *saved_bh; unsigned long j_len_saved = jl->j_len; struct reiserfs_journal *journal = SB_JOURNAL(s); int err = 0; int depth; BUG_ON(j_len_saved <= 0); if (atomic_read(&journal->j_wcount) != 0) { reiserfs_warning(s, "clm-2048", "called with wcount %d", atomic_read(&journal->j_wcount)); } /* if flushall == 0, the lock is already held */ if (flushall) { reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s); } else if (mutex_trylock(&journal->j_flush_mutex)) { BUG(); } count = 0; if (j_len_saved > journal->j_trans_max) { reiserfs_panic(s, "journal-715", "length is %lu, trans id %lu", j_len_saved, jl->j_trans_id); return 0; } /* if all the work is already done, get out of here */ if (atomic_read(&jl->j_nonzerolen) <= 0 && atomic_read(&jl->j_commit_left) <= 0) { goto flush_older_and_return; } /* * start by putting the commit list on disk. This will also flush * the commit lists of any olders transactions */ flush_commit_list(s, jl, 1); if (!(jl->j_state & LIST_DIRTY) && !reiserfs_is_journal_aborted(journal)) BUG(); /* are we done now? */ if (atomic_read(&jl->j_nonzerolen) <= 0 && atomic_read(&jl->j_commit_left) <= 0) { goto flush_older_and_return; } /* * loop through each cnode, see if we need to write it, * or wait on a more recent transaction, or just ignore it */ if (atomic_read(&journal->j_wcount) != 0) { reiserfs_panic(s, "journal-844", "journal list is flushing, " "wcount is not 0"); } cn = jl->j_realblock; while (cn) { was_jwait = 0; was_dirty = 0; saved_bh = NULL; /* blocknr of 0 is no longer in the hash, ignore it */ if (cn->blocknr == 0) { goto free_cnode; } /* * This transaction failed commit. * Don't write out to the disk */ if (!(jl->j_state & LIST_DIRTY)) goto free_cnode; pjl = find_newer_jl_for_cn(cn); /* * the order is important here. We check pjl to make sure we * don't clear BH_JDirty_wait if we aren't the one writing this * block to disk */ if (!pjl && cn->bh) { saved_bh = cn->bh; /* * we do this to make sure nobody releases the * buffer while we are working with it */ get_bh(saved_bh); if (buffer_journal_dirty(saved_bh)) { BUG_ON(!can_dirty(cn)); was_jwait = 1; was_dirty = 1; } else if (can_dirty(cn)) { /* * everything with !pjl && jwait * should be writable */ BUG(); } } /* * if someone has this block in a newer transaction, just make * sure they are committed, and don't try writing it to disk */ if (pjl) { if (atomic_read(&pjl->j_commit_left)) flush_commit_list(s, pjl, 1); goto free_cnode; } /* * bh == NULL when the block got to disk on its own, OR, * the block got freed in a future transaction */ if (saved_bh == NULL) { goto free_cnode; } /* * this should never happen. kupdate_one_transaction has * this list locked while it works, so we should never see a * buffer here that is not marked JDirty_wait */ if ((!was_jwait) && !buffer_locked(saved_bh)) { reiserfs_warning(s, "journal-813", "BAD! buffer %llu %cdirty %cjwait, " "not in a newer transaction", (unsigned long long)saved_bh-> b_blocknr, was_dirty ? ' ' : '!', was_jwait ? ' ' : '!'); } if (was_dirty) { /* * we inc again because saved_bh gets decremented * at free_cnode */ get_bh(saved_bh); set_bit(BLOCK_NEEDS_FLUSH, &cn->state); lock_buffer(saved_bh); BUG_ON(cn->blocknr != saved_bh->b_blocknr); if (buffer_dirty(saved_bh)) submit_logged_buffer(saved_bh); else unlock_buffer(saved_bh); count++; } else { reiserfs_warning(s, "clm-2082", "Unable to flush buffer %llu in %s", (unsigned long long)saved_bh-> b_blocknr, __func__); } free_cnode: cn = cn->next; if (saved_bh) { /* * we incremented this to keep others from * taking the buffer head away */ put_bh(saved_bh); if (atomic_read(&saved_bh->b_count) < 0) { reiserfs_warning(s, "journal-945", "saved_bh->b_count < 0"); } } } if (count > 0) { cn = jl->j_realblock; while (cn) { if (test_bit(BLOCK_NEEDS_FLUSH, &cn->state)) { if (!cn->bh) { reiserfs_panic(s, "journal-1011", "cn->bh is NULL"); } depth = reiserfs_write_unlock_nested(s); __wait_on_buffer(cn->bh); reiserfs_write_lock_nested(s, depth); if (!cn->bh) { reiserfs_panic(s, "journal-1012", "cn->bh is NULL"); } if (unlikely(!buffer_uptodate(cn->bh))) { #ifdef CONFIG_REISERFS_CHECK reiserfs_warning(s, "journal-949", "buffer write failed"); #endif err = -EIO; } /* * note, we must clear the JDirty_wait bit * after the up to date check, otherwise we * race against our flushpage routine */ BUG_ON(!test_clear_buffer_journal_dirty (cn->bh)); /* drop one ref for us */ put_bh(cn->bh); /* drop one ref for journal_mark_dirty */ release_buffer_page(cn->bh); } cn = cn->next; } } if (err) reiserfs_abort(s, -EIO, "Write error while pushing transaction to disk in %s", __func__); flush_older_and_return: /* * before we can update the journal header block, we _must_ flush all * real blocks from all older transactions to disk. This is because * once the header block is updated, this transaction will not be * replayed after a crash */ if (flushall) { flush_older_journal_lists(s, jl); } err = journal->j_errno; /* * before we can remove everything from the hash tables for this * transaction, we must make sure it can never be replayed * * since we are only called from do_journal_end, we know for sure there * are no allocations going on while we are flushing journal lists. So, * we only need to update the journal header block for the last list * being flushed */ if (!err && flushall) { err = update_journal_header_block(s, (jl->j_start + jl->j_len + 2) % SB_ONDISK_JOURNAL_SIZE(s), jl->j_trans_id); if (err) reiserfs_abort(s, -EIO, "Write error while updating journal header in %s", __func__); } remove_all_from_journal_list(s, jl, 0); list_del_init(&jl->j_list); journal->j_num_lists--; del_from_work_list(s, jl); if (journal->j_last_flush_id != 0 && (jl->j_trans_id - journal->j_last_flush_id) != 1) { reiserfs_warning(s, "clm-2201", "last flush %lu, current %lu", journal->j_last_flush_id, jl->j_trans_id); } journal->j_last_flush_id = jl->j_trans_id; /* * not strictly required since we are freeing the list, but it should * help find code using dead lists later on */ jl->j_len = 0; atomic_set(&jl->j_nonzerolen, 0); jl->j_start = 0; jl->j_realblock = NULL; jl->j_commit_bh = NULL; jl->j_trans_id = 0; jl->j_state = 0; put_journal_list(s, jl); if (flushall) mutex_unlock(&journal->j_flush_mutex); return err; } static int write_one_transaction(struct super_block *s, struct reiserfs_journal_list *jl, struct buffer_chunk *chunk) { struct reiserfs_journal_cnode *cn; int ret = 0; jl->j_state |= LIST_TOUCHED; del_from_work_list(s, jl); if (jl->j_len == 0 || atomic_read(&jl->j_nonzerolen) == 0) { return 0; } cn = jl->j_realblock; while (cn) { /* * if the blocknr == 0, this has been cleared from the hash, * skip it */ if (cn->blocknr == 0) { goto next; } if (cn->bh && can_dirty(cn) && buffer_dirty(cn->bh)) { struct buffer_head *tmp_bh; /* * we can race against journal_mark_freed when we try * to lock_buffer(cn->bh), so we have to inc the buffer * count, and recheck things after locking */ tmp_bh = cn->bh; get_bh(tmp_bh); lock_buffer(tmp_bh); if (cn->bh && can_dirty(cn) && buffer_dirty(tmp_bh)) { if (!buffer_journal_dirty(tmp_bh) || buffer_journal_prepared(tmp_bh)) BUG(); add_to_chunk(chunk, tmp_bh, NULL, write_chunk); ret++; } else { /* note, cn->bh might be null now */ unlock_buffer(tmp_bh); } put_bh(tmp_bh); } next: cn = cn->next; cond_resched(); } return ret; } /* used by flush_commit_list */ static void dirty_one_transaction(struct super_block *s, struct reiserfs_journal_list *jl) { struct reiserfs_journal_cnode *cn; struct reiserfs_journal_list *pjl; jl->j_state |= LIST_DIRTY; cn = jl->j_realblock; while (cn) { /* * look for a more recent transaction that logged this * buffer. Only the most recent transaction with a buffer in * it is allowed to send that buffer to disk */ pjl = find_newer_jl_for_cn(cn); if (!pjl && cn->blocknr && cn->bh && buffer_journal_dirty(cn->bh)) { BUG_ON(!can_dirty(cn)); /* * if the buffer is prepared, it will either be logged * or restored. If restored, we need to make sure * it actually gets marked dirty */ clear_buffer_journal_new(cn->bh); if (buffer_journal_prepared(cn->bh)) { set_buffer_journal_restore_dirty(cn->bh); } else { set_buffer_journal_test(cn->bh); mark_buffer_dirty(cn->bh); } } cn = cn->next; } } static int kupdate_transactions(struct super_block *s, struct reiserfs_journal_list *jl, struct reiserfs_journal_list **next_jl, unsigned int *next_trans_id, int num_blocks, int num_trans) { int ret = 0; int written = 0; int transactions_flushed = 0; unsigned int orig_trans_id = jl->j_trans_id; struct buffer_chunk chunk; struct list_head *entry; struct reiserfs_journal *journal = SB_JOURNAL(s); chunk.nr = 0; reiserfs_mutex_lock_safe(&journal->j_flush_mutex, s); if (!journal_list_still_alive(s, orig_trans_id)) { goto done; } /* * we've got j_flush_mutex held, nobody is going to delete any * of these lists out from underneath us */ while ((num_trans && transactions_flushed < num_trans) || (!num_trans && written < num_blocks)) { if (jl->j_len == 0 || (jl->j_state & LIST_TOUCHED) || atomic_read(&jl->j_commit_left) || !(jl->j_state & LIST_DIRTY)) { del_from_work_list(s, jl); break; } ret = write_one_transaction(s, jl, &chunk); if (ret < 0) goto done; transactions_flushed++; written += ret; entry = jl->j_list.next; /* did we wrap? */ if (entry == &journal->j_journal_list) { break; } jl = JOURNAL_LIST_ENTRY(entry); /* don't bother with older transactions */ if (jl->j_trans_id <= orig_trans_id) break; } if (chunk.nr) { write_chunk(&chunk); } done: mutex_unlock(&journal->j_flush_mutex); return ret; } /* * for o_sync and fsync heavy applications, they tend to use * all the journa list slots with tiny transactions. These * trigger lots and lots of calls to update the header block, which * adds seeks and slows things down. * * This function tries to clear out a large chunk of the journal lists * at once, which makes everything faster since only the newest journal * list updates the header block */ static int flush_used_journal_lists(struct super_block *s, struct reiserfs_journal_list *jl) { unsigned long len = 0; unsigned long cur_len; int i; int limit = 256; struct reiserfs_journal_list *tjl; struct reiserfs_journal_list *flush_jl; unsigned int trans_id; struct reiserfs_journal *journal = SB_JOURNAL(s); flush_jl = tjl = jl; /* in data logging mode, try harder to flush a lot of blocks */ if (reiserfs_data_log(s)) limit = 1024; /* flush for 256 transactions or limit blocks, whichever comes first */ for (i = 0; i < 256 && len < limit; i++) { if (atomic_read(&tjl->j_commit_left) || tjl->j_trans_id < jl->j_trans_id) { break; } cur_len = atomic_read(&tjl->j_nonzerolen); if (cur_len > 0) { tjl->j_state &= ~LIST_TOUCHED; } len += cur_len; flush_jl = tjl; if (tjl->j_list.next == &journal->j_journal_list) break; tjl = JOURNAL_LIST_ENTRY(tjl->j_list.next); } get_journal_list(jl); get_journal_list(flush_jl); /* * try to find a group of blocks we can flush across all the * transactions, but only bother if we've actually spanned * across multiple lists */ if (flush_jl != jl) kupdate_transactions(s, jl, &tjl, &trans_id, len, i); flush_journal_list(s, flush_jl, 1); put_journal_list(s, flush_jl); put_journal_list(s, jl); return 0; } /* * removes any nodes in table with name block and dev as bh. * only touchs the hnext and hprev pointers. */ static void remove_journal_hash(struct super_block *sb, struct reiserfs_journal_cnode **table, struct reiserfs_journal_list *jl, unsigned long block, int remove_freed) { struct reiserfs_journal_cnode *cur; struct reiserfs_journal_cnode **head; head = &(journal_hash(table, sb, block)); if (!head) { return; } cur = *head; while (cur) { if (cur->blocknr == block && cur->sb == sb && (jl == NULL || jl == cur->jlist) && (!test_bit(BLOCK_FREED, &cur->state) || remove_freed)) { if (cur->hnext) { cur->hnext->hprev = cur->hprev; } if (cur->hprev) { cur->hprev->hnext = cur->hnext; } else { *head = cur->hnext; } cur->blocknr = 0; cur->sb = NULL; cur->state = 0; /* * anybody who clears the cur->bh will also * dec the nonzerolen */ if (cur->bh && cur->jlist) atomic_dec(&cur->jlist->j_nonzerolen); cur->bh = NULL; cur->jlist = NULL; } cur = cur->hnext; } } static void free_journal_ram(struct super_block *sb) { struct reiserfs_journal *journal = SB_JOURNAL(sb); kfree(journal->j_current_jl); journal->j_num_lists--; vfree(journal->j_cnode_free_orig); free_list_bitmaps(sb, journal->j_list_bitmap); free_bitmap_nodes(sb); /* must be after free_list_bitmaps */ if (journal->j_header_bh) { brelse(journal->j_header_bh); } /* * j_header_bh is on the journal dev, make sure * not to release the journal dev until we brelse j_header_bh */ release_journal_dev(journal); vfree(journal); } /* * call on unmount. Only set error to 1 if you haven't made your way out * of read_super() yet. Any other caller must keep error at 0. */ static int do_journal_release(struct reiserfs_transaction_handle *th, struct super_block *sb, int error) { struct reiserfs_transaction_handle myth; struct reiserfs_journal *journal = SB_JOURNAL(sb); /* * we only want to flush out transactions if we were * called with error == 0 */ if (!error && !sb_rdonly(sb)) { /* end the current trans */ BUG_ON(!th->t_trans_id); do_journal_end(th, FLUSH_ALL); /* * make sure something gets logged to force * our way into the flush code */ if (!journal_join(&myth, sb)) { reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), 1); journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb)); do_journal_end(&myth, FLUSH_ALL); } } /* this also catches errors during the do_journal_end above */ if (!error && reiserfs_is_journal_aborted(journal)) { memset(&myth, 0, sizeof(myth)); if (!journal_join_abort(&myth, sb)) { reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), 1); journal_mark_dirty(&myth, SB_BUFFER_WITH_SB(sb)); do_journal_end(&myth, FLUSH_ALL); } } /* * We must release the write lock here because * the workqueue job (flush_async_commit) needs this lock */ reiserfs_write_unlock(sb); /* * Cancel flushing of old commits. Note that neither of these works * will be requeued because superblock is being shutdown and doesn't * have SB_ACTIVE set. */ reiserfs_cancel_old_flush(sb); /* wait for all commits to finish */ cancel_delayed_work_sync(&SB_JOURNAL(sb)->j_work); free_journal_ram(sb); reiserfs_write_lock(sb); return 0; } /* * call on unmount. flush all journal trans, release all alloc'd ram */ int journal_release(struct reiserfs_transaction_handle *th, struct super_block *sb) { return do_journal_release(th, sb, 0); } /* only call from an error condition inside reiserfs_read_super! */ int journal_release_error(struct reiserfs_transaction_handle *th, struct super_block *sb) { return do_journal_release(th, sb, 1); } /* * compares description block with commit block. * returns 1 if they differ, 0 if they are the same */ static int journal_compare_desc_commit(struct super_block *sb, struct reiserfs_journal_desc *desc, struct reiserfs_journal_commit *commit) { if (get_commit_trans_id(commit) != get_desc_trans_id(desc) || get_commit_trans_len(commit) != get_desc_trans_len(desc) || get_commit_trans_len(commit) > SB_JOURNAL(sb)->j_trans_max || get_commit_trans_len(commit) <= 0) { return 1; } return 0; } /* * returns 0 if it did not find a description block * returns -1 if it found a corrupt commit block * returns 1 if both desc and commit were valid * NOTE: only called during fs mount */ static int journal_transaction_is_valid(struct super_block *sb, struct buffer_head *d_bh, unsigned int *oldest_invalid_trans_id, unsigned long *newest_mount_id) { struct reiserfs_journal_desc *desc; struct reiserfs_journal_commit *commit; struct buffer_head *c_bh; unsigned long offset; if (!d_bh) return 0; desc = (struct reiserfs_journal_desc *)d_bh->b_data; if (get_desc_trans_len(desc) > 0 && !memcmp(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8)) { if (oldest_invalid_trans_id && *oldest_invalid_trans_id && get_desc_trans_id(desc) > *oldest_invalid_trans_id) { reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-986: transaction " "is valid returning because trans_id %d is greater than " "oldest_invalid %lu", get_desc_trans_id(desc), *oldest_invalid_trans_id); return 0; } if (newest_mount_id && *newest_mount_id > get_desc_mount_id(desc)) { reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1087: transaction " "is valid returning because mount_id %d is less than " "newest_mount_id %lu", get_desc_mount_id(desc), *newest_mount_id); return -1; } if (get_desc_trans_len(desc) > SB_JOURNAL(sb)->j_trans_max) { reiserfs_warning(sb, "journal-2018", "Bad transaction length %d " "encountered, ignoring transaction", get_desc_trans_len(desc)); return -1; } offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb); /* * ok, we have a journal description block, * let's see if the transaction was valid */ c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + ((offset + get_desc_trans_len(desc) + 1) % SB_ONDISK_JOURNAL_SIZE(sb))); if (!c_bh) return 0; commit = (struct reiserfs_journal_commit *)c_bh->b_data; if (journal_compare_desc_commit(sb, desc, commit)) { reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal_transaction_is_valid, commit offset %ld had bad " "time %d or length %d", c_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb), get_commit_trans_id(commit), get_commit_trans_len(commit)); brelse(c_bh); if (oldest_invalid_trans_id) { *oldest_invalid_trans_id = get_desc_trans_id(desc); reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1004: " "transaction_is_valid setting oldest invalid trans_id " "to %d", get_desc_trans_id(desc)); } return -1; } brelse(c_bh); reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1006: found valid " "transaction start offset %llu, len %d id %d", d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb), get_desc_trans_len(desc), get_desc_trans_id(desc)); return 1; } else { return 0; } } static void brelse_array(struct buffer_head **heads, int num) { int i; for (i = 0; i < num; i++) { brelse(heads[i]); } } /* * given the start, and values for the oldest acceptable transactions, * this either reads in a replays a transaction, or returns because the * transaction is invalid, or too old. * NOTE: only called during fs mount */ static int journal_read_transaction(struct super_block *sb, unsigned long cur_dblock, unsigned long oldest_start, unsigned int oldest_trans_id, unsigned long newest_mount_id) { struct reiserfs_journal *journal = SB_JOURNAL(sb); struct reiserfs_journal_desc *desc; struct reiserfs_journal_commit *commit; unsigned int trans_id = 0; struct buffer_head *c_bh; struct buffer_head *d_bh; struct buffer_head **log_blocks = NULL; struct buffer_head **real_blocks = NULL; unsigned int trans_offset; int i; int trans_half; d_bh = journal_bread(sb, cur_dblock); if (!d_bh) return 1; desc = (struct reiserfs_journal_desc *)d_bh->b_data; trans_offset = d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb); reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1037: " "journal_read_transaction, offset %llu, len %d mount_id %d", d_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb), get_desc_trans_len(desc), get_desc_mount_id(desc)); if (get_desc_trans_id(desc) < oldest_trans_id) { reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1039: " "journal_read_trans skipping because %lu is too old", cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb)); brelse(d_bh); return 1; } if (get_desc_mount_id(desc) != newest_mount_id) { reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1146: " "journal_read_trans skipping because %d is != " "newest_mount_id %lu", get_desc_mount_id(desc), newest_mount_id); brelse(d_bh); return 1; } c_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + ((trans_offset + get_desc_trans_len(desc) + 1) % SB_ONDISK_JOURNAL_SIZE(sb))); if (!c_bh) { brelse(d_bh); return 1; } commit = (struct reiserfs_journal_commit *)c_bh->b_data; if (journal_compare_desc_commit(sb, desc, commit)) { reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal_read_transaction, " "commit offset %llu had bad time %d or length %d", c_bh->b_blocknr - SB_ONDISK_JOURNAL_1st_BLOCK(sb), get_commit_trans_id(commit), get_commit_trans_len(commit)); brelse(c_bh); brelse(d_bh); return 1; } if (bdev_read_only(sb->s_bdev)) { reiserfs_warning(sb, "clm-2076", "device is readonly, unable to replay log"); brelse(c_bh); brelse(d_bh); return -EROFS; } trans_id = get_desc_trans_id(desc); /* * now we know we've got a good transaction, and it was * inside the valid time ranges */ log_blocks = kmalloc_array(get_desc_trans_len(desc), sizeof(struct buffer_head *), GFP_NOFS); real_blocks = kmalloc_array(get_desc_trans_len(desc), sizeof(struct buffer_head *), GFP_NOFS); if (!log_blocks || !real_blocks) { brelse(c_bh); brelse(d_bh); kfree(log_blocks); kfree(real_blocks); reiserfs_warning(sb, "journal-1169", "kmalloc failed, unable to mount FS"); return -1; } /* get all the buffer heads */ trans_half = journal_trans_half(sb->s_blocksize); for (i = 0; i < get_desc_trans_len(desc); i++) { log_blocks[i] = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + (trans_offset + 1 + i) % SB_ONDISK_JOURNAL_SIZE(sb)); if (i < trans_half) { real_blocks[i] = sb_getblk(sb, le32_to_cpu(desc->j_realblock[i])); } else { real_blocks[i] = sb_getblk(sb, le32_to_cpu(commit-> j_realblock[i - trans_half])); } if (real_blocks[i]->b_blocknr > SB_BLOCK_COUNT(sb)) { reiserfs_warning(sb, "journal-1207", "REPLAY FAILURE fsck required! " "Block to replay is outside of " "filesystem"); goto abort_replay; } /* make sure we don't try to replay onto log or reserved area */ if (is_block_in_log_or_reserved_area (sb, real_blocks[i]->b_blocknr)) { reiserfs_warning(sb, "journal-1204", "REPLAY FAILURE fsck required! " "Trying to replay onto a log block"); abort_replay: brelse_array(log_blocks, i); brelse_array(real_blocks, i); brelse(c_bh); brelse(d_bh); kfree(log_blocks); kfree(real_blocks); return -1; } } /* read in the log blocks, memcpy to the corresponding real block */ bh_read_batch(get_desc_trans_len(desc), log_blocks); for (i = 0; i < get_desc_trans_len(desc); i++) { wait_on_buffer(log_blocks[i]); if (!buffer_uptodate(log_blocks[i])) { reiserfs_warning(sb, "journal-1212", "REPLAY FAILURE fsck required! " "buffer write failed"); brelse_array(log_blocks + i, get_desc_trans_len(desc) - i); brelse_array(real_blocks, get_desc_trans_len(desc)); brelse(c_bh); brelse(d_bh); kfree(log_blocks); kfree(real_blocks); return -1; } memcpy(real_blocks[i]->b_data, log_blocks[i]->b_data, real_blocks[i]->b_size); set_buffer_uptodate(real_blocks[i]); brelse(log_blocks[i]); } /* flush out the real blocks */ for (i = 0; i < get_desc_trans_len(desc); i++) { set_buffer_dirty(real_blocks[i]); write_dirty_buffer(real_blocks[i], 0); } for (i = 0; i < get_desc_trans_len(desc); i++) { wait_on_buffer(real_blocks[i]); if (!buffer_uptodate(real_blocks[i])) { reiserfs_warning(sb, "journal-1226", "REPLAY FAILURE, fsck required! " "buffer write failed"); brelse_array(real_blocks + i, get_desc_trans_len(desc) - i); brelse(c_bh); brelse(d_bh); kfree(log_blocks); kfree(real_blocks); return -1; } brelse(real_blocks[i]); } cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb) + ((trans_offset + get_desc_trans_len(desc) + 2) % SB_ONDISK_JOURNAL_SIZE(sb)); reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1095: setting journal " "start to offset %ld", cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb)); /* * init starting values for the first transaction, in case * this is the last transaction to be replayed. */ journal->j_start = cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb); journal->j_last_flush_trans_id = trans_id; journal->j_trans_id = trans_id + 1; /* check for trans_id overflow */ if (journal->j_trans_id == 0) journal->j_trans_id = 10; brelse(c_bh); brelse(d_bh); kfree(log_blocks); kfree(real_blocks); return 0; } /* * This function reads blocks starting from block and to max_block of bufsize * size (but no more than BUFNR blocks at a time). This proved to improve * mounting speed on self-rebuilding raid5 arrays at least. * Right now it is only used from journal code. But later we might use it * from other places. * Note: Do not use journal_getblk/sb_getblk functions here! */ static struct buffer_head *reiserfs_breada(struct block_device *dev, b_blocknr_t block, int bufsize, b_blocknr_t max_block) { struct buffer_head *bhlist[BUFNR]; unsigned int blocks = BUFNR; struct buffer_head *bh; int i, j; bh = __getblk(dev, block, bufsize); if (!bh || buffer_uptodate(bh)) return (bh); if (block + BUFNR > max_block) { blocks = max_block - block; } bhlist[0] = bh; j = 1; for (i = 1; i < blocks; i++) { bh = __getblk(dev, block + i, bufsize); if (!bh) break; if (buffer_uptodate(bh)) { brelse(bh); break; } else bhlist[j++] = bh; } bh = bhlist[0]; bh_read_nowait(bh, 0); bh_readahead_batch(j - 1, &bhlist[1], 0); for (i = 1; i < j; i++) brelse(bhlist[i]); wait_on_buffer(bh); if (buffer_uptodate(bh)) return bh; brelse(bh); return NULL; } /* * read and replay the log * on a clean unmount, the journal header's next unflushed pointer will be * to an invalid transaction. This tests that before finding all the * transactions in the log, which makes normal mount times fast. * * After a crash, this starts with the next unflushed transaction, and * replays until it finds one too old, or invalid. * * On exit, it sets things up so the first transaction will work correctly. * NOTE: only called during fs mount */ static int journal_read(struct super_block *sb) { struct reiserfs_journal *journal = SB_JOURNAL(sb); struct reiserfs_journal_desc *desc; unsigned int oldest_trans_id = 0; unsigned int oldest_invalid_trans_id = 0; time64_t start; unsigned long oldest_start = 0; unsigned long cur_dblock = 0; unsigned long newest_mount_id = 9; struct buffer_head *d_bh; struct reiserfs_journal_header *jh; int valid_journal_header = 0; int replay_count = 0; int continue_replay = 1; int ret; cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb); reiserfs_info(sb, "checking transaction log (%pg)\n", journal->j_bdev_handle->bdev); start = ktime_get_seconds(); /* * step 1, read in the journal header block. Check the transaction * it says is the first unflushed, and if that transaction is not * valid, replay is done */ journal->j_header_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + SB_ONDISK_JOURNAL_SIZE(sb)); if (!journal->j_header_bh) { return 1; } jh = (struct reiserfs_journal_header *)(journal->j_header_bh->b_data); if (le32_to_cpu(jh->j_first_unflushed_offset) < SB_ONDISK_JOURNAL_SIZE(sb) && le32_to_cpu(jh->j_last_flush_trans_id) > 0) { oldest_start = SB_ONDISK_JOURNAL_1st_BLOCK(sb) + le32_to_cpu(jh->j_first_unflushed_offset); oldest_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1; newest_mount_id = le32_to_cpu(jh->j_mount_id); reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1153: found in " "header: first_unflushed_offset %d, last_flushed_trans_id " "%lu", le32_to_cpu(jh->j_first_unflushed_offset), le32_to_cpu(jh->j_last_flush_trans_id)); valid_journal_header = 1; /* * now, we try to read the first unflushed offset. If it * is not valid, there is nothing more we can do, and it * makes no sense to read through the whole log. */ d_bh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + le32_to_cpu(jh->j_first_unflushed_offset)); ret = journal_transaction_is_valid(sb, d_bh, NULL, NULL); if (!ret) { continue_replay = 0; } brelse(d_bh); goto start_log_replay; } /* * ok, there are transactions that need to be replayed. start * with the first log block, find all the valid transactions, and * pick out the oldest. */ while (continue_replay && cur_dblock < (SB_ONDISK_JOURNAL_1st_BLOCK(sb) + SB_ONDISK_JOURNAL_SIZE(sb))) { /* * Note that it is required for blocksize of primary fs * device and journal device to be the same */ d_bh = reiserfs_breada(journal->j_bdev_handle->bdev, cur_dblock, sb->s_blocksize, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + SB_ONDISK_JOURNAL_SIZE(sb)); ret = journal_transaction_is_valid(sb, d_bh, &oldest_invalid_trans_id, &newest_mount_id); if (ret == 1) { desc = (struct reiserfs_journal_desc *)d_bh->b_data; if (oldest_start == 0) { /* init all oldest_ values */ oldest_trans_id = get_desc_trans_id(desc); oldest_start = d_bh->b_blocknr; newest_mount_id = get_desc_mount_id(desc); reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1179: Setting " "oldest_start to offset %llu, trans_id %lu", oldest_start - SB_ONDISK_JOURNAL_1st_BLOCK (sb), oldest_trans_id); } else if (oldest_trans_id > get_desc_trans_id(desc)) { /* one we just read was older */ oldest_trans_id = get_desc_trans_id(desc); oldest_start = d_bh->b_blocknr; reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1180: Resetting " "oldest_start to offset %lu, trans_id %lu", oldest_start - SB_ONDISK_JOURNAL_1st_BLOCK (sb), oldest_trans_id); } if (newest_mount_id < get_desc_mount_id(desc)) { newest_mount_id = get_desc_mount_id(desc); reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting " "newest_mount_id to %d", get_desc_mount_id(desc)); } cur_dblock += get_desc_trans_len(desc) + 2; } else { cur_dblock++; } brelse(d_bh); } start_log_replay: cur_dblock = oldest_start; if (oldest_trans_id) { reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1206: Starting replay " "from offset %llu, trans_id %lu", cur_dblock - SB_ONDISK_JOURNAL_1st_BLOCK(sb), oldest_trans_id); } replay_count = 0; while (continue_replay && oldest_trans_id > 0) { ret = journal_read_transaction(sb, cur_dblock, oldest_start, oldest_trans_id, newest_mount_id); if (ret < 0) { return ret; } else if (ret != 0) { break; } cur_dblock = SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start; replay_count++; if (cur_dblock == oldest_start) break; } if (oldest_trans_id == 0) { reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1225: No valid " "transactions found"); } /* * j_start does not get set correctly if we don't replay any * transactions. if we had a valid journal_header, set j_start * to the first unflushed transaction value, copy the trans_id * from the header */ if (valid_journal_header && replay_count == 0) { journal->j_start = le32_to_cpu(jh->j_first_unflushed_offset); journal->j_trans_id = le32_to_cpu(jh->j_last_flush_trans_id) + 1; /* check for trans_id overflow */ if (journal->j_trans_id == 0) journal->j_trans_id = 10; journal->j_last_flush_trans_id = le32_to_cpu(jh->j_last_flush_trans_id); journal->j_mount_id = le32_to_cpu(jh->j_mount_id) + 1; } else { journal->j_mount_id = newest_mount_id + 1; } reiserfs_debug(sb, REISERFS_DEBUG_CODE, "journal-1299: Setting " "newest_mount_id to %lu", journal->j_mount_id); journal->j_first_unflushed_offset = journal->j_start; if (replay_count > 0) { reiserfs_info(sb, "replayed %d transactions in %lu seconds\n", replay_count, ktime_get_seconds() - start); } /* needed to satisfy the locking in _update_journal_header_block */ reiserfs_write_lock(sb); if (!bdev_read_only(sb->s_bdev) && _update_journal_header_block(sb, journal->j_start, journal->j_last_flush_trans_id)) { reiserfs_write_unlock(sb); /* * replay failed, caller must call free_journal_ram and abort * the mount */ return -1; } reiserfs_write_unlock(sb); return 0; } static struct reiserfs_journal_list *alloc_journal_list(struct super_block *s) { struct reiserfs_journal_list *jl; jl = kzalloc(sizeof(struct reiserfs_journal_list), GFP_NOFS | __GFP_NOFAIL); INIT_LIST_HEAD(&jl->j_list); INIT_LIST_HEAD(&jl->j_working_list); INIT_LIST_HEAD(&jl->j_tail_bh_list); INIT_LIST_HEAD(&jl->j_bh_list); mutex_init(&jl->j_commit_mutex); SB_JOURNAL(s)->j_num_lists++; get_journal_list(jl); return jl; } static void journal_list_init(struct super_block *sb) { SB_JOURNAL(sb)->j_current_jl = alloc_journal_list(sb); } static void release_journal_dev(struct reiserfs_journal *journal) { if (journal->j_bdev_handle) { bdev_release(journal->j_bdev_handle); journal->j_bdev_handle = NULL; } } static int journal_init_dev(struct super_block *super, struct reiserfs_journal *journal, const char *jdev_name) { blk_mode_t blkdev_mode = BLK_OPEN_READ; void *holder = journal; int result; dev_t jdev; result = 0; journal->j_bdev_handle = NULL; jdev = SB_ONDISK_JOURNAL_DEVICE(super) ? new_decode_dev(SB_ONDISK_JOURNAL_DEVICE(super)) : super->s_dev; if (!bdev_read_only(super->s_bdev)) blkdev_mode |= BLK_OPEN_WRITE; /* there is no "jdev" option and journal is on separate device */ if ((!jdev_name || !jdev_name[0])) { if (jdev == super->s_dev) holder = NULL; journal->j_bdev_handle = bdev_open_by_dev(jdev, blkdev_mode, holder, NULL); if (IS_ERR(journal->j_bdev_handle)) { result = PTR_ERR(journal->j_bdev_handle); journal->j_bdev_handle = NULL; reiserfs_warning(super, "sh-458", "cannot init journal device unknown-block(%u,%u): %i", MAJOR(jdev), MINOR(jdev), result); return result; } else if (jdev != super->s_dev) set_blocksize(journal->j_bdev_handle->bdev, super->s_blocksize); return 0; } journal->j_bdev_handle = bdev_open_by_path(jdev_name, blkdev_mode, holder, NULL); if (IS_ERR(journal->j_bdev_handle)) { result = PTR_ERR(journal->j_bdev_handle); journal->j_bdev_handle = NULL; reiserfs_warning(super, "sh-457", "journal_init_dev: Cannot open '%s': %i", jdev_name, result); return result; } set_blocksize(journal->j_bdev_handle->bdev, super->s_blocksize); reiserfs_info(super, "journal_init_dev: journal device: %pg\n", journal->j_bdev_handle->bdev); return 0; } /* * When creating/tuning a file system user can assign some * journal params within boundaries which depend on the ratio * blocksize/standard_blocksize. * * For blocks >= standard_blocksize transaction size should * be not less then JOURNAL_TRANS_MIN_DEFAULT, and not more * then JOURNAL_TRANS_MAX_DEFAULT. * * For blocks < standard_blocksize these boundaries should be * decreased proportionally. */ #define REISERFS_STANDARD_BLKSIZE (4096) static int check_advise_trans_params(struct super_block *sb, struct reiserfs_journal *journal) { if (journal->j_trans_max) { /* Non-default journal params. Do sanity check for them. */ int ratio = 1; if (sb->s_blocksize < REISERFS_STANDARD_BLKSIZE) ratio = REISERFS_STANDARD_BLKSIZE / sb->s_blocksize; if (journal->j_trans_max > JOURNAL_TRANS_MAX_DEFAULT / ratio || journal->j_trans_max < JOURNAL_TRANS_MIN_DEFAULT / ratio || SB_ONDISK_JOURNAL_SIZE(sb) / journal->j_trans_max < JOURNAL_MIN_RATIO) { reiserfs_warning(sb, "sh-462", "bad transaction max size (%u). " "FSCK?", journal->j_trans_max); return 1; } if (journal->j_max_batch != (journal->j_trans_max) * JOURNAL_MAX_BATCH_DEFAULT/JOURNAL_TRANS_MAX_DEFAULT) { reiserfs_warning(sb, "sh-463", "bad transaction max batch (%u). " "FSCK?", journal->j_max_batch); return 1; } } else { /* * Default journal params. * The file system was created by old version * of mkreiserfs, so some fields contain zeros, * and we need to advise proper values for them */ if (sb->s_blocksize != REISERFS_STANDARD_BLKSIZE) { reiserfs_warning(sb, "sh-464", "bad blocksize (%u)", sb->s_blocksize); return 1; } journal->j_trans_max = JOURNAL_TRANS_MAX_DEFAULT; journal->j_max_batch = JOURNAL_MAX_BATCH_DEFAULT; journal->j_max_commit_age = JOURNAL_MAX_COMMIT_AGE; } return 0; } /* must be called once on fs mount. calls journal_read for you */ int journal_init(struct super_block *sb, const char *j_dev_name, int old_format, unsigned int commit_max_age) { int num_cnodes = SB_ONDISK_JOURNAL_SIZE(sb) * 2; struct buffer_head *bhjh; struct reiserfs_super_block *rs; struct reiserfs_journal_header *jh; struct reiserfs_journal *journal; struct reiserfs_journal_list *jl; int ret; journal = SB_JOURNAL(sb) = vzalloc(sizeof(struct reiserfs_journal)); if (!journal) { reiserfs_warning(sb, "journal-1256", "unable to get memory for journal structure"); return 1; } INIT_LIST_HEAD(&journal->j_bitmap_nodes); INIT_LIST_HEAD(&journal->j_prealloc_list); INIT_LIST_HEAD(&journal->j_working_list); INIT_LIST_HEAD(&journal->j_journal_list); journal->j_persistent_trans = 0; if (reiserfs_allocate_list_bitmaps(sb, journal->j_list_bitmap, reiserfs_bmap_count(sb))) goto free_and_return; allocate_bitmap_nodes(sb); /* reserved for journal area support */ SB_JOURNAL_1st_RESERVED_BLOCK(sb) = (old_format ? REISERFS_OLD_DISK_OFFSET_IN_BYTES / sb->s_blocksize + reiserfs_bmap_count(sb) + 1 : REISERFS_DISK_OFFSET_IN_BYTES / sb->s_blocksize + 2); /* * Sanity check to see is the standard journal fitting * within first bitmap (actual for small blocksizes) */ if (!SB_ONDISK_JOURNAL_DEVICE(sb) && (SB_JOURNAL_1st_RESERVED_BLOCK(sb) + SB_ONDISK_JOURNAL_SIZE(sb) > sb->s_blocksize * 8)) { reiserfs_warning(sb, "journal-1393", "journal does not fit for area addressed " "by first of bitmap blocks. It starts at " "%u and its size is %u. Block size %ld", SB_JOURNAL_1st_RESERVED_BLOCK(sb), SB_ONDISK_JOURNAL_SIZE(sb), sb->s_blocksize); goto free_and_return; } /* * Sanity check to see if journal first block is correct. * If journal first block is invalid it can cause * zeroing important superblock members. */ if (!SB_ONDISK_JOURNAL_DEVICE(sb) && SB_ONDISK_JOURNAL_1st_BLOCK(sb) < SB_JOURNAL_1st_RESERVED_BLOCK(sb)) { reiserfs_warning(sb, "journal-1393", "journal 1st super block is invalid: 1st reserved block %d, but actual 1st block is %d", SB_JOURNAL_1st_RESERVED_BLOCK(sb), SB_ONDISK_JOURNAL_1st_BLOCK(sb)); goto free_and_return; } if (journal_init_dev(sb, journal, j_dev_name) != 0) { reiserfs_warning(sb, "sh-462", "unable to initialize journal device"); goto free_and_return; } rs = SB_DISK_SUPER_BLOCK(sb); /* read journal header */ bhjh = journal_bread(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + SB_ONDISK_JOURNAL_SIZE(sb)); if (!bhjh) { reiserfs_warning(sb, "sh-459", "unable to read journal header"); goto free_and_return; } jh = (struct reiserfs_journal_header *)(bhjh->b_data); /* make sure that journal matches to the super block */ if (is_reiserfs_jr(rs) && (le32_to_cpu(jh->jh_journal.jp_journal_magic) != sb_jp_journal_magic(rs))) { reiserfs_warning(sb, "sh-460", "journal header magic %x (device %pg) does " "not match to magic found in super block %x", jh->jh_journal.jp_journal_magic, journal->j_bdev_handle->bdev, sb_jp_journal_magic(rs)); brelse(bhjh); goto free_and_return; } journal->j_trans_max = le32_to_cpu(jh->jh_journal.jp_journal_trans_max); journal->j_max_batch = le32_to_cpu(jh->jh_journal.jp_journal_max_batch); journal->j_max_commit_age = le32_to_cpu(jh->jh_journal.jp_journal_max_commit_age); journal->j_max_trans_age = JOURNAL_MAX_TRANS_AGE; if (check_advise_trans_params(sb, journal) != 0) goto free_and_return; journal->j_default_max_commit_age = journal->j_max_commit_age; if (commit_max_age != 0) { journal->j_max_commit_age = commit_max_age; journal->j_max_trans_age = commit_max_age; } reiserfs_info(sb, "journal params: device %pg, size %u, " "journal first block %u, max trans len %u, max batch %u, " "max commit age %u, max trans age %u\n", journal->j_bdev_handle->bdev, SB_ONDISK_JOURNAL_SIZE(sb), SB_ONDISK_JOURNAL_1st_BLOCK(sb), journal->j_trans_max, journal->j_max_batch, journal->j_max_commit_age, journal->j_max_trans_age); brelse(bhjh); journal->j_list_bitmap_index = 0; journal_list_init(sb); memset(journal->j_list_hash_table, 0, JOURNAL_HASH_SIZE * sizeof(struct reiserfs_journal_cnode *)); INIT_LIST_HEAD(&journal->j_dirty_buffers); spin_lock_init(&journal->j_dirty_buffers_lock); journal->j_start = 0; journal->j_len = 0; journal->j_len_alloc = 0; atomic_set(&journal->j_wcount, 0); atomic_set(&journal->j_async_throttle, 0); journal->j_bcount = 0; journal->j_trans_start_time = 0; journal->j_last = NULL; journal->j_first = NULL; init_waitqueue_head(&journal->j_join_wait); mutex_init(&journal->j_mutex); mutex_init(&journal->j_flush_mutex); journal->j_trans_id = 10; journal->j_mount_id = 10; journal->j_state = 0; atomic_set(&journal->j_jlock, 0); journal->j_cnode_free_list = allocate_cnodes(num_cnodes); journal->j_cnode_free_orig = journal->j_cnode_free_list; journal->j_cnode_free = journal->j_cnode_free_list ? num_cnodes : 0; journal->j_cnode_used = 0; journal->j_must_wait = 0; if (journal->j_cnode_free == 0) { reiserfs_warning(sb, "journal-2004", "Journal cnode memory " "allocation failed (%ld bytes). Journal is " "too large for available memory. Usually " "this is due to a journal that is too large.", sizeof (struct reiserfs_journal_cnode) * num_cnodes); goto free_and_return; } init_journal_hash(sb); jl = journal->j_current_jl; /* * get_list_bitmap() may call flush_commit_list() which * requires the lock. Calling flush_commit_list() shouldn't happen * this early but I like to be paranoid. */ reiserfs_write_lock(sb); jl->j_list_bitmap = get_list_bitmap(sb, jl); reiserfs_write_unlock(sb); if (!jl->j_list_bitmap) { reiserfs_warning(sb, "journal-2005", "get_list_bitmap failed for journal list 0"); goto free_and_return; } ret = journal_read(sb); if (ret < 0) { reiserfs_warning(sb, "reiserfs-2006", "Replay Failure, unable to mount"); goto free_and_return; } INIT_DELAYED_WORK(&journal->j_work, flush_async_commits); journal->j_work_sb = sb; return 0; free_and_return: free_journal_ram(sb); return 1; } /* * test for a polite end of the current transaction. Used by file_write, * and should be used by delete to make sure they don't write more than * can fit inside a single transaction */ int journal_transaction_should_end(struct reiserfs_transaction_handle *th, int new_alloc) { struct reiserfs_journal *journal = SB_JOURNAL(th->t_super); time64_t now = ktime_get_seconds(); /* cannot restart while nested */ BUG_ON(!th->t_trans_id); if (th->t_refcount > 1) return 0; if (journal->j_must_wait > 0 || (journal->j_len_alloc + new_alloc) >= journal->j_max_batch || atomic_read(&journal->j_jlock) || (now - journal->j_trans_start_time) > journal->j_max_trans_age || journal->j_cnode_free < (journal->j_trans_max * 3)) { return 1; } journal->j_len_alloc += new_alloc; th->t_blocks_allocated += new_alloc ; return 0; } /* this must be called inside a transaction */ void reiserfs_block_writes(struct reiserfs_transaction_handle *th) { struct reiserfs_journal *journal = SB_JOURNAL(th->t_super); BUG_ON(!th->t_trans_id); journal->j_must_wait = 1; set_bit(J_WRITERS_BLOCKED, &journal->j_state); return; } /* this must be called without a transaction started */ void reiserfs_allow_writes(struct super_block *s) { struct reiserfs_journal *journal = SB_JOURNAL(s); clear_bit(J_WRITERS_BLOCKED, &journal->j_state); wake_up(&journal->j_join_wait); } /* this must be called without a transaction started */ void reiserfs_wait_on_write_block(struct super_block *s) { struct reiserfs_journal *journal = SB_JOURNAL(s); wait_event(journal->j_join_wait, !test_bit(J_WRITERS_BLOCKED, &journal->j_state)); } static void queue_log_writer(struct super_block *s) { wait_queue_entry_t wait; struct reiserfs_journal *journal = SB_JOURNAL(s); set_bit(J_WRITERS_QUEUED, &journal->j_state); /* * we don't want to use wait_event here because * we only want to wait once. */ init_waitqueue_entry(&wait, current); add_wait_queue(&journal->j_join_wait, &wait); set_current_state(TASK_UNINTERRUPTIBLE); if (test_bit(J_WRITERS_QUEUED, &journal->j_state)) { int depth = reiserfs_write_unlock_nested(s); schedule(); reiserfs_write_lock_nested(s, depth); } __set_current_state(TASK_RUNNING); remove_wait_queue(&journal->j_join_wait, &wait); } static void wake_queued_writers(struct super_block *s) { struct reiserfs_journal *journal = SB_JOURNAL(s); if (test_and_clear_bit(J_WRITERS_QUEUED, &journal->j_state)) wake_up(&journal->j_join_wait); } static void let_transaction_grow(struct super_block *sb, unsigned int trans_id) { struct reiserfs_journal *journal = SB_JOURNAL(sb); unsigned long bcount = journal->j_bcount; while (1) { int depth; depth = reiserfs_write_unlock_nested(sb); schedule_timeout_uninterruptible(1); reiserfs_write_lock_nested(sb, depth); journal->j_current_jl->j_state |= LIST_COMMIT_PENDING; while ((atomic_read(&journal->j_wcount) > 0 || atomic_read(&journal->j_jlock)) && journal->j_trans_id == trans_id) { queue_log_writer(sb); } if (journal->j_trans_id != trans_id) break; if (bcount == journal->j_bcount) break; bcount = journal->j_bcount; } } /* * join == true if you must join an existing transaction. * join == false if you can deal with waiting for others to finish * * this will block until the transaction is joinable. send the number of * blocks you expect to use in nblocks. */ static int do_journal_begin_r(struct reiserfs_transaction_handle *th, struct super_block *sb, unsigned long nblocks, int join) { time64_t now = ktime_get_seconds(); unsigned int old_trans_id; struct reiserfs_journal *journal = SB_JOURNAL(sb); struct reiserfs_transaction_handle myth; int retval; int depth; reiserfs_check_lock_depth(sb, "journal_begin"); BUG_ON(nblocks > journal->j_trans_max); PROC_INFO_INC(sb, journal.journal_being); /* set here for journal_join */ th->t_refcount = 1; th->t_super = sb; relock: lock_journal(sb); if (join != JBEGIN_ABORT && reiserfs_is_journal_aborted(journal)) { unlock_journal(sb); retval = journal->j_errno; goto out_fail; } journal->j_bcount++; if (test_bit(J_WRITERS_BLOCKED, &journal->j_state)) { unlock_journal(sb); depth = reiserfs_write_unlock_nested(sb); reiserfs_wait_on_write_block(sb); reiserfs_write_lock_nested(sb, depth); PROC_INFO_INC(sb, journal.journal_relock_writers); goto relock; } now = ktime_get_seconds(); /* * if there is no room in the journal OR * if this transaction is too old, and we weren't called joinable, * wait for it to finish before beginning we don't sleep if there * aren't other writers */ if ((!join && journal->j_must_wait > 0) || (!join && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch) || (!join && atomic_read(&journal->j_wcount) > 0 && journal->j_trans_start_time > 0 && (now - journal->j_trans_start_time) > journal->j_max_trans_age) || (!join && atomic_read(&journal->j_jlock)) || (!join && journal->j_cnode_free < (journal->j_trans_max * 3))) { old_trans_id = journal->j_trans_id; /* allow others to finish this transaction */ unlock_journal(sb); if (!join && (journal->j_len_alloc + nblocks + 2) >= journal->j_max_batch && ((journal->j_len + nblocks + 2) * 100) < (journal->j_len_alloc * 75)) { if (atomic_read(&journal->j_wcount) > 10) { queue_log_writer(sb); goto relock; } } /* * don't mess with joining the transaction if all we * have to do is wait for someone else to do a commit */ if (atomic_read(&journal->j_jlock)) { while (journal->j_trans_id == old_trans_id && atomic_read(&journal->j_jlock)) { queue_log_writer(sb); } goto relock; } retval = journal_join(&myth, sb); if (retval) goto out_fail; /* someone might have ended the transaction while we joined */ if (old_trans_id != journal->j_trans_id) { retval = do_journal_end(&myth, 0); } else { retval = do_journal_end(&myth, COMMIT_NOW); } if (retval) goto out_fail; PROC_INFO_INC(sb, journal.journal_relock_wcount); goto relock; } /* we are the first writer, set trans_id */ if (journal->j_trans_start_time == 0) { journal->j_trans_start_time = ktime_get_seconds(); } atomic_inc(&journal->j_wcount); journal->j_len_alloc += nblocks; th->t_blocks_logged = 0; th->t_blocks_allocated = nblocks; th->t_trans_id = journal->j_trans_id; unlock_journal(sb); INIT_LIST_HEAD(&th->t_list); return 0; out_fail: memset(th, 0, sizeof(*th)); /* * Re-set th->t_super, so we can properly keep track of how many * persistent transactions there are. We need to do this so if this * call is part of a failed restart_transaction, we can free it later */ th->t_super = sb; return retval; } struct reiserfs_transaction_handle *reiserfs_persistent_transaction(struct super_block *s, int nblocks) { int ret; struct reiserfs_transaction_handle *th; /* * if we're nesting into an existing transaction. It will be * persistent on its own */ if (reiserfs_transaction_running(s)) { th = current->journal_info; th->t_refcount++; BUG_ON(th->t_refcount < 2); return th; } th = kmalloc(sizeof(struct reiserfs_transaction_handle), GFP_NOFS); if (!th) return NULL; ret = journal_begin(th, s, nblocks); if (ret) { kfree(th); return NULL; } SB_JOURNAL(s)->j_persistent_trans++; return th; } int reiserfs_end_persistent_transaction(struct reiserfs_transaction_handle *th) { struct super_block *s = th->t_super; int ret = 0; if (th->t_trans_id) ret = journal_end(th); else ret = -EIO; if (th->t_refcount == 0) { SB_JOURNAL(s)->j_persistent_trans--; kfree(th); } return ret; } static int journal_join(struct reiserfs_transaction_handle *th, struct super_block *sb) { struct reiserfs_transaction_handle *cur_th = current->journal_info; /* * this keeps do_journal_end from NULLing out the * current->journal_info pointer */ th->t_handle_save = cur_th; BUG_ON(cur_th && cur_th->t_refcount > 1); return do_journal_begin_r(th, sb, 1, JBEGIN_JOIN); } int journal_join_abort(struct reiserfs_transaction_handle *th, struct super_block *sb) { struct reiserfs_transaction_handle *cur_th = current->journal_info; /* * this keeps do_journal_end from NULLing out the * current->journal_info pointer */ th->t_handle_save = cur_th; BUG_ON(cur_th && cur_th->t_refcount > 1); return do_journal_begin_r(th, sb, 1, JBEGIN_ABORT); } int journal_begin(struct reiserfs_transaction_handle *th, struct super_block *sb, unsigned long nblocks) { struct reiserfs_transaction_handle *cur_th = current->journal_info; int ret; th->t_handle_save = NULL; if (cur_th) { /* we are nesting into the current transaction */ if (cur_th->t_super == sb) { BUG_ON(!cur_th->t_refcount); cur_th->t_refcount++; memcpy(th, cur_th, sizeof(*th)); if (th->t_refcount <= 1) reiserfs_warning(sb, "reiserfs-2005", "BAD: refcount <= 1, but " "journal_info != 0"); return 0; } else { /* * we've ended up with a handle from a different * filesystem. save it and restore on journal_end. * This should never really happen... */ reiserfs_warning(sb, "clm-2100", "nesting info a different FS"); th->t_handle_save = current->journal_info; current->journal_info = th; } } else { current->journal_info = th; } ret = do_journal_begin_r(th, sb, nblocks, JBEGIN_REG); BUG_ON(current->journal_info != th); /* * I guess this boils down to being the reciprocal of clm-2100 above. * If do_journal_begin_r fails, we need to put it back, since * journal_end won't be called to do it. */ if (ret) current->journal_info = th->t_handle_save; else BUG_ON(!th->t_refcount); return ret; } /* * puts bh into the current transaction. If it was already there, reorders * removes the old pointers from the hash, and puts new ones in (to make * sure replay happen in the right order). * * if it was dirty, cleans and files onto the clean list. I can't let it * be dirty again until the transaction is committed. * * if j_len, is bigger than j_len_alloc, it pushes j_len_alloc to 10 + j_len. */ int journal_mark_dirty(struct reiserfs_transaction_handle *th, struct buffer_head *bh) { struct super_block *sb = th->t_super; struct reiserfs_journal *journal = SB_JOURNAL(sb); struct reiserfs_journal_cnode *cn = NULL; int count_already_incd = 0; int prepared = 0; BUG_ON(!th->t_trans_id); PROC_INFO_INC(sb, journal.mark_dirty); if (th->t_trans_id != journal->j_trans_id) { reiserfs_panic(th->t_super, "journal-1577", "handle trans id %ld != current trans id %ld", th->t_trans_id, journal->j_trans_id); } prepared = test_clear_buffer_journal_prepared(bh); clear_buffer_journal_restore_dirty(bh); /* already in this transaction, we are done */ if (buffer_journaled(bh)) { PROC_INFO_INC(sb, journal.mark_dirty_already); return 0; } /* * this must be turned into a panic instead of a warning. We can't * allow a dirty or journal_dirty or locked buffer to be logged, as * some changes could get to disk too early. NOT GOOD. */ if (!prepared || buffer_dirty(bh)) { reiserfs_warning(sb, "journal-1777", "buffer %llu bad state " "%cPREPARED %cLOCKED %cDIRTY %cJDIRTY_WAIT", (unsigned long long)bh->b_blocknr, prepared ? ' ' : '!', buffer_locked(bh) ? ' ' : '!', buffer_dirty(bh) ? ' ' : '!', buffer_journal_dirty(bh) ? ' ' : '!'); } if (atomic_read(&journal->j_wcount) <= 0) { reiserfs_warning(sb, "journal-1409", "returning because j_wcount was %d", atomic_read(&journal->j_wcount)); return 1; } /* * this error means I've screwed up, and we've overflowed * the transaction. Nothing can be done here, except make the * FS readonly or panic. */ if (journal->j_len >= journal->j_trans_max) { reiserfs_panic(th->t_super, "journal-1413", "j_len (%lu) is too big", journal->j_len); } if (buffer_journal_dirty(bh)) { count_already_incd = 1; PROC_INFO_INC(sb, journal.mark_dirty_notjournal); clear_buffer_journal_dirty(bh); } if (journal->j_len > journal->j_len_alloc) { journal->j_len_alloc = journal->j_len + JOURNAL_PER_BALANCE_CNT; } set_buffer_journaled(bh); /* now put this guy on the end */ if (!cn) { cn = get_cnode(sb); if (!cn) { reiserfs_panic(sb, "journal-4", "get_cnode failed!"); } if (th->t_blocks_logged == th->t_blocks_allocated) { th->t_blocks_allocated += JOURNAL_PER_BALANCE_CNT; journal->j_len_alloc += JOURNAL_PER_BALANCE_CNT; } th->t_blocks_logged++; journal->j_len++; cn->bh = bh; cn->blocknr = bh->b_blocknr; cn->sb = sb; cn->jlist = NULL; insert_journal_hash(journal->j_hash_table, cn); if (!count_already_incd) { get_bh(bh); } } cn->next = NULL; cn->prev = journal->j_last; cn->bh = bh; if (journal->j_last) { journal->j_last->next = cn; journal->j_last = cn; } else { journal->j_first = cn; journal->j_last = cn; } reiserfs_schedule_old_flush(sb); return 0; } int journal_end(struct reiserfs_transaction_handle *th) { struct super_block *sb = th->t_super; if (!current->journal_info && th->t_refcount > 1) reiserfs_warning(sb, "REISER-NESTING", "th NULL, refcount %d", th->t_refcount); if (!th->t_trans_id) { WARN_ON(1); return -EIO; } th->t_refcount--; if (th->t_refcount > 0) { struct reiserfs_transaction_handle *cur_th = current->journal_info; /* * we aren't allowed to close a nested transaction on a * different filesystem from the one in the task struct */ BUG_ON(cur_th->t_super != th->t_super); if (th != cur_th) { memcpy(current->journal_info, th, sizeof(*th)); th->t_trans_id = 0; } return 0; } else { return do_journal_end(th, 0); } } /* * removes from the current transaction, relsing and descrementing any counters. * also files the removed buffer directly onto the clean list * * called by journal_mark_freed when a block has been deleted * * returns 1 if it cleaned and relsed the buffer. 0 otherwise */ static int remove_from_transaction(struct super_block *sb, b_blocknr_t blocknr, int already_cleaned) { struct buffer_head *bh; struct reiserfs_journal_cnode *cn; struct reiserfs_journal *journal = SB_JOURNAL(sb); int ret = 0; cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr); if (!cn || !cn->bh) { return ret; } bh = cn->bh; if (cn->prev) { cn->prev->next = cn->next; } if (cn->next) { cn->next->prev = cn->prev; } if (cn == journal->j_first) { journal->j_first = cn->next; } if (cn == journal->j_last) { journal->j_last = cn->prev; } remove_journal_hash(sb, journal->j_hash_table, NULL, bh->b_blocknr, 0); clear_buffer_journaled(bh); /* don't log this one */ if (!already_cleaned) { clear_buffer_journal_dirty(bh); clear_buffer_dirty(bh); clear_buffer_journal_test(bh); put_bh(bh); if (atomic_read(&bh->b_count) < 0) { reiserfs_warning(sb, "journal-1752", "b_count < 0"); } ret = 1; } journal->j_len--; journal->j_len_alloc--; free_cnode(sb, cn); return ret; } /* * for any cnode in a journal list, it can only be dirtied of all the * transactions that include it are committed to disk. * this checks through each transaction, and returns 1 if you are allowed * to dirty, and 0 if you aren't * * it is called by dirty_journal_list, which is called after * flush_commit_list has gotten all the log blocks for a given * transaction on disk * */ static int can_dirty(struct reiserfs_journal_cnode *cn) { struct super_block *sb = cn->sb; b_blocknr_t blocknr = cn->blocknr; struct reiserfs_journal_cnode *cur = cn->hprev; int can_dirty = 1; /* * first test hprev. These are all newer than cn, so any node here * with the same block number and dev means this node can't be sent * to disk right now. */ while (cur && can_dirty) { if (cur->jlist && cur->bh && cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) { can_dirty = 0; } cur = cur->hprev; } /* * then test hnext. These are all older than cn. As long as they * are committed to the log, it is safe to write cn to disk */ cur = cn->hnext; while (cur && can_dirty) { if (cur->jlist && cur->jlist->j_len > 0 && atomic_read(&cur->jlist->j_commit_left) > 0 && cur->bh && cur->blocknr && cur->sb == sb && cur->blocknr == blocknr) { can_dirty = 0; } cur = cur->hnext; } return can_dirty; } /* * syncs the commit blocks, but does not force the real buffers to disk * will wait until the current transaction is done/committed before returning */ int journal_end_sync(struct reiserfs_transaction_handle *th) { struct super_block *sb = th->t_super; struct reiserfs_journal *journal = SB_JOURNAL(sb); BUG_ON(!th->t_trans_id); /* you can sync while nested, very, very bad */ BUG_ON(th->t_refcount > 1); if (journal->j_len == 0) { reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), 1); journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb)); } return do_journal_end(th, COMMIT_NOW | WAIT); } /* writeback the pending async commits to disk */ static void flush_async_commits(struct work_struct *work) { struct reiserfs_journal *journal = container_of(work, struct reiserfs_journal, j_work.work); struct super_block *sb = journal->j_work_sb; struct reiserfs_journal_list *jl; struct list_head *entry; reiserfs_write_lock(sb); if (!list_empty(&journal->j_journal_list)) { /* last entry is the youngest, commit it and you get everything */ entry = journal->j_journal_list.prev; jl = JOURNAL_LIST_ENTRY(entry); flush_commit_list(sb, jl, 1); } reiserfs_write_unlock(sb); } /* * flushes any old transactions to disk * ends the current transaction if it is too old */ void reiserfs_flush_old_commits(struct super_block *sb) { time64_t now; struct reiserfs_transaction_handle th; struct reiserfs_journal *journal = SB_JOURNAL(sb); now = ktime_get_seconds(); /* * safety check so we don't flush while we are replaying the log during * mount */ if (list_empty(&journal->j_journal_list)) return; /* * check the current transaction. If there are no writers, and it is * too old, finish it, and force the commit blocks to disk */ if (atomic_read(&journal->j_wcount) <= 0 && journal->j_trans_start_time > 0 && journal->j_len > 0 && (now - journal->j_trans_start_time) > journal->j_max_trans_age) { if (!journal_join(&th, sb)) { reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), 1); journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb)); /* * we're only being called from kreiserfsd, it makes * no sense to do an async commit so that kreiserfsd * can do it later */ do_journal_end(&th, COMMIT_NOW | WAIT); } } } /* * returns 0 if do_journal_end should return right away, returns 1 if * do_journal_end should finish the commit * * if the current transaction is too old, but still has writers, this will * wait on j_join_wait until all the writers are done. By the time it * wakes up, the transaction it was called has already ended, so it just * flushes the commit list and returns 0. * * Won't batch when flush or commit_now is set. Also won't batch when * others are waiting on j_join_wait. * * Note, we can't allow the journal_end to proceed while there are still * writers in the log. */ static int check_journal_end(struct reiserfs_transaction_handle *th, int flags) { time64_t now; int flush = flags & FLUSH_ALL; int commit_now = flags & COMMIT_NOW; int wait_on_commit = flags & WAIT; struct reiserfs_journal_list *jl; struct super_block *sb = th->t_super; struct reiserfs_journal *journal = SB_JOURNAL(sb); BUG_ON(!th->t_trans_id); if (th->t_trans_id != journal->j_trans_id) { reiserfs_panic(th->t_super, "journal-1577", "handle trans id %ld != current trans id %ld", th->t_trans_id, journal->j_trans_id); } journal->j_len_alloc -= (th->t_blocks_allocated - th->t_blocks_logged); /* <= 0 is allowed. unmounting might not call begin */ if (atomic_read(&journal->j_wcount) > 0) atomic_dec(&journal->j_wcount); /* * BUG, deal with case where j_len is 0, but people previously * freed blocks need to be released will be dealt with by next * transaction that actually writes something, but should be taken * care of in this trans */ BUG_ON(journal->j_len == 0); /* * if wcount > 0, and we are called to with flush or commit_now, * we wait on j_join_wait. We will wake up when the last writer has * finished the transaction, and started it on its way to the disk. * Then, we flush the commit or journal list, and just return 0 * because the rest of journal end was already done for this * transaction. */ if (atomic_read(&journal->j_wcount) > 0) { if (flush || commit_now) { unsigned trans_id; jl = journal->j_current_jl; trans_id = jl->j_trans_id; if (wait_on_commit) jl->j_state |= LIST_COMMIT_PENDING; atomic_set(&journal->j_jlock, 1); if (flush) { journal->j_next_full_flush = 1; } unlock_journal(sb); /* * sleep while the current transaction is * still j_jlocked */ while (journal->j_trans_id == trans_id) { if (atomic_read(&journal->j_jlock)) { queue_log_writer(sb); } else { lock_journal(sb); if (journal->j_trans_id == trans_id) { atomic_set(&journal->j_jlock, 1); } unlock_journal(sb); } } BUG_ON(journal->j_trans_id == trans_id); if (commit_now && journal_list_still_alive(sb, trans_id) && wait_on_commit) { flush_commit_list(sb, jl, 1); } return 0; } unlock_journal(sb); return 0; } /* deal with old transactions where we are the last writers */ now = ktime_get_seconds(); if ((now - journal->j_trans_start_time) > journal->j_max_trans_age) { commit_now = 1; journal->j_next_async_flush = 1; } /* don't batch when someone is waiting on j_join_wait */ /* don't batch when syncing the commit or flushing the whole trans */ if (!(journal->j_must_wait > 0) && !(atomic_read(&journal->j_jlock)) && !flush && !commit_now && (journal->j_len < journal->j_max_batch) && journal->j_len_alloc < journal->j_max_batch && journal->j_cnode_free > (journal->j_trans_max * 3)) { journal->j_bcount++; unlock_journal(sb); return 0; } if (journal->j_start > SB_ONDISK_JOURNAL_SIZE(sb)) { reiserfs_panic(sb, "journal-003", "j_start (%ld) is too high", journal->j_start); } return 1; } /* * Does all the work that makes deleting blocks safe. * when deleting a block mark BH_JNew, just remove it from the current * transaction, clean it's buffer_head and move on. * * otherwise: * set a bit for the block in the journal bitmap. That will prevent it from * being allocated for unformatted nodes before this transaction has finished. * * mark any cnodes for this block as BLOCK_FREED, and clear their bh pointers. * That will prevent any old transactions with this block from trying to flush * to the real location. Since we aren't removing the cnode from the * journal_list_hash, *the block can't be reallocated yet. * * Then remove it from the current transaction, decrementing any counters and * filing it on the clean list. */ int journal_mark_freed(struct reiserfs_transaction_handle *th, struct super_block *sb, b_blocknr_t blocknr) { struct reiserfs_journal *journal = SB_JOURNAL(sb); struct reiserfs_journal_cnode *cn = NULL; struct buffer_head *bh = NULL; struct reiserfs_list_bitmap *jb = NULL; int cleaned = 0; BUG_ON(!th->t_trans_id); cn = get_journal_hash_dev(sb, journal->j_hash_table, blocknr); if (cn && cn->bh) { bh = cn->bh; get_bh(bh); } /* if it is journal new, we just remove it from this transaction */ if (bh && buffer_journal_new(bh)) { clear_buffer_journal_new(bh); clear_prepared_bits(bh); reiserfs_clean_and_file_buffer(bh); cleaned = remove_from_transaction(sb, blocknr, cleaned); } else { /* * set the bit for this block in the journal bitmap * for this transaction */ jb = journal->j_current_jl->j_list_bitmap; if (!jb) { reiserfs_panic(sb, "journal-1702", "journal_list_bitmap is NULL"); } set_bit_in_list_bitmap(sb, blocknr, jb); /* Note, the entire while loop is not allowed to schedule. */ if (bh) { clear_prepared_bits(bh); reiserfs_clean_and_file_buffer(bh); } cleaned = remove_from_transaction(sb, blocknr, cleaned); /* * find all older transactions with this block, * make sure they don't try to write it out */ cn = get_journal_hash_dev(sb, journal->j_list_hash_table, blocknr); while (cn) { if (sb == cn->sb && blocknr == cn->blocknr) { set_bit(BLOCK_FREED, &cn->state); if (cn->bh) { /* * remove_from_transaction will brelse * the buffer if it was in the current * trans */ if (!cleaned) { clear_buffer_journal_dirty(cn-> bh); clear_buffer_dirty(cn->bh); clear_buffer_journal_test(cn-> bh); cleaned = 1; put_bh(cn->bh); if (atomic_read (&cn->bh->b_count) < 0) { reiserfs_warning(sb, "journal-2138", "cn->bh->b_count < 0"); } } /* * since we are clearing the bh, * we MUST dec nonzerolen */ if (cn->jlist) { atomic_dec(&cn->jlist-> j_nonzerolen); } cn->bh = NULL; } } cn = cn->hnext; } } if (bh) release_buffer_page(bh); /* get_hash grabs the buffer */ return 0; } void reiserfs_update_inode_transaction(struct inode *inode) { struct reiserfs_journal *journal = SB_JOURNAL(inode->i_sb); REISERFS_I(inode)->i_jl = journal->j_current_jl; REISERFS_I(inode)->i_trans_id = journal->j_trans_id; } /* * returns -1 on error, 0 if no commits/barriers were done and 1 * if a transaction was actually committed and the barrier was done */ static int __commit_trans_jl(struct inode *inode, unsigned long id, struct reiserfs_journal_list *jl) { struct reiserfs_transaction_handle th; struct super_block *sb = inode->i_sb; struct reiserfs_journal *journal = SB_JOURNAL(sb); int ret = 0; /* * is it from the current transaction, * or from an unknown transaction? */ if (id == journal->j_trans_id) { jl = journal->j_current_jl; /* * try to let other writers come in and * grow this transaction */ let_transaction_grow(sb, id); if (journal->j_trans_id != id) { goto flush_commit_only; } ret = journal_begin(&th, sb, 1); if (ret) return ret; /* someone might have ended this transaction while we joined */ if (journal->j_trans_id != id) { reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), 1); journal_mark_dirty(&th, SB_BUFFER_WITH_SB(sb)); ret = journal_end(&th); goto flush_commit_only; } ret = journal_end_sync(&th); if (!ret) ret = 1; } else { /* * this gets tricky, we have to make sure the journal list in * the inode still exists. We know the list is still around * if we've got a larger transaction id than the oldest list */ flush_commit_only: if (journal_list_still_alive(inode->i_sb, id)) { /* * we only set ret to 1 when we know for sure * the barrier hasn't been started yet on the commit * block. */ if (atomic_read(&jl->j_commit_left) > 1) ret = 1; flush_commit_list(sb, jl, 1); if (journal->j_errno) ret = journal->j_errno; } } /* otherwise the list is gone, and long since committed */ return ret; } int reiserfs_commit_for_inode(struct inode *inode) { unsigned int id = REISERFS_I(inode)->i_trans_id; struct reiserfs_journal_list *jl = REISERFS_I(inode)->i_jl; /* * for the whole inode, assume unset id means it was * changed in the current transaction. More conservative */ if (!id || !jl) { reiserfs_update_inode_transaction(inode); id = REISERFS_I(inode)->i_trans_id; /* jl will be updated in __commit_trans_jl */ } return __commit_trans_jl(inode, id, jl); } void reiserfs_restore_prepared_buffer(struct super_block *sb, struct buffer_head *bh) { struct reiserfs_journal *journal = SB_JOURNAL(sb); PROC_INFO_INC(sb, journal.restore_prepared); if (!bh) { return; } if (test_clear_buffer_journal_restore_dirty(bh) && buffer_journal_dirty(bh)) { struct reiserfs_journal_cnode *cn; reiserfs_write_lock(sb); cn = get_journal_hash_dev(sb, journal->j_list_hash_table, bh->b_blocknr); if (cn && can_dirty(cn)) { set_buffer_journal_test(bh); mark_buffer_dirty(bh); } reiserfs_write_unlock(sb); } clear_buffer_journal_prepared(bh); } extern struct tree_balance *cur_tb; /* * before we can change a metadata block, we have to make sure it won't * be written to disk while we are altering it. So, we must: * clean it * wait on it. */ int reiserfs_prepare_for_journal(struct super_block *sb, struct buffer_head *bh, int wait) { PROC_INFO_INC(sb, journal.prepare); if (!trylock_buffer(bh)) { if (!wait) return 0; lock_buffer(bh); } set_buffer_journal_prepared(bh); if (test_clear_buffer_dirty(bh) && buffer_journal_dirty(bh)) { clear_buffer_journal_test(bh); set_buffer_journal_restore_dirty(bh); } unlock_buffer(bh); return 1; } /* * long and ugly. If flush, will not return until all commit * blocks and all real buffers in the trans are on disk. * If no_async, won't return until all commit blocks are on disk. * * keep reading, there are comments as you go along * * If the journal is aborted, we just clean up. Things like flushing * journal lists, etc just won't happen. */ static int do_journal_end(struct reiserfs_transaction_handle *th, int flags) { struct super_block *sb = th->t_super; struct reiserfs_journal *journal = SB_JOURNAL(sb); struct reiserfs_journal_cnode *cn, *next, *jl_cn; struct reiserfs_journal_cnode *last_cn = NULL; struct reiserfs_journal_desc *desc; struct reiserfs_journal_commit *commit; struct buffer_head *c_bh; /* commit bh */ struct buffer_head *d_bh; /* desc bh */ int cur_write_start = 0; /* start index of current log write */ int i; int flush; int wait_on_commit; struct reiserfs_journal_list *jl, *temp_jl; struct list_head *entry, *safe; unsigned long jindex; unsigned int commit_trans_id; int trans_half; int depth; BUG_ON(th->t_refcount > 1); BUG_ON(!th->t_trans_id); BUG_ON(!th->t_super); /* * protect flush_older_commits from doing mistakes if the * transaction ID counter gets overflowed. */ if (th->t_trans_id == ~0U) flags |= FLUSH_ALL | COMMIT_NOW | WAIT; flush = flags & FLUSH_ALL; wait_on_commit = flags & WAIT; current->journal_info = th->t_handle_save; reiserfs_check_lock_depth(sb, "journal end"); if (journal->j_len == 0) { reiserfs_prepare_for_journal(sb, SB_BUFFER_WITH_SB(sb), 1); journal_mark_dirty(th, SB_BUFFER_WITH_SB(sb)); } lock_journal(sb); if (journal->j_next_full_flush) { flags |= FLUSH_ALL; flush = 1; } if (journal->j_next_async_flush) { flags |= COMMIT_NOW | WAIT; wait_on_commit = 1; } /* * check_journal_end locks the journal, and unlocks if it does * not return 1 it tells us if we should continue with the * journal_end, or just return */ if (!check_journal_end(th, flags)) { reiserfs_schedule_old_flush(sb); wake_queued_writers(sb); reiserfs_async_progress_wait(sb); goto out; } /* check_journal_end might set these, check again */ if (journal->j_next_full_flush) { flush = 1; } /* * j must wait means we have to flush the log blocks, and the * real blocks for this transaction */ if (journal->j_must_wait > 0) { flush = 1; } #ifdef REISERFS_PREALLOCATE /* * quota ops might need to nest, setup the journal_info pointer * for them and raise the refcount so that it is > 0. */ current->journal_info = th; th->t_refcount++; /* it should not involve new blocks into the transaction */ reiserfs_discard_all_prealloc(th); th->t_refcount--; current->journal_info = th->t_handle_save; #endif /* setup description block */ d_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + journal->j_start); set_buffer_uptodate(d_bh); desc = (struct reiserfs_journal_desc *)(d_bh)->b_data; memset(d_bh->b_data, 0, d_bh->b_size); memcpy(get_journal_desc_magic(d_bh), JOURNAL_DESC_MAGIC, 8); set_desc_trans_id(desc, journal->j_trans_id); /* * setup commit block. Don't write (keep it clean too) this one * until after everyone else is written */ c_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + ((journal->j_start + journal->j_len + 1) % SB_ONDISK_JOURNAL_SIZE(sb))); commit = (struct reiserfs_journal_commit *)c_bh->b_data; memset(c_bh->b_data, 0, c_bh->b_size); set_commit_trans_id(commit, journal->j_trans_id); set_buffer_uptodate(c_bh); /* init this journal list */ jl = journal->j_current_jl; /* * we lock the commit before doing anything because * we want to make sure nobody tries to run flush_commit_list until * the new transaction is fully setup, and we've already flushed the * ordered bh list */ reiserfs_mutex_lock_safe(&jl->j_commit_mutex, sb); /* save the transaction id in case we need to commit it later */ commit_trans_id = jl->j_trans_id; atomic_set(&jl->j_older_commits_done, 0); jl->j_trans_id = journal->j_trans_id; jl->j_timestamp = journal->j_trans_start_time; jl->j_commit_bh = c_bh; jl->j_start = journal->j_start; jl->j_len = journal->j_len; atomic_set(&jl->j_nonzerolen, journal->j_len); atomic_set(&jl->j_commit_left, journal->j_len + 2); jl->j_realblock = NULL; /* * The ENTIRE FOR LOOP MUST not cause schedule to occur. * for each real block, add it to the journal list hash, * copy into real block index array in the commit or desc block */ trans_half = journal_trans_half(sb->s_blocksize); for (i = 0, cn = journal->j_first; cn; cn = cn->next, i++) { if (buffer_journaled(cn->bh)) { jl_cn = get_cnode(sb); if (!jl_cn) { reiserfs_panic(sb, "journal-1676", "get_cnode returned NULL"); } if (i == 0) { jl->j_realblock = jl_cn; } jl_cn->prev = last_cn; jl_cn->next = NULL; if (last_cn) { last_cn->next = jl_cn; } last_cn = jl_cn; /* * make sure the block we are trying to log * is not a block of journal or reserved area */ if (is_block_in_log_or_reserved_area (sb, cn->bh->b_blocknr)) { reiserfs_panic(sb, "journal-2332", "Trying to log block %lu, " "which is a log block", cn->bh->b_blocknr); } jl_cn->blocknr = cn->bh->b_blocknr; jl_cn->state = 0; jl_cn->sb = sb; jl_cn->bh = cn->bh; jl_cn->jlist = jl; insert_journal_hash(journal->j_list_hash_table, jl_cn); if (i < trans_half) { desc->j_realblock[i] = cpu_to_le32(cn->bh->b_blocknr); } else { commit->j_realblock[i - trans_half] = cpu_to_le32(cn->bh->b_blocknr); } } else { i--; } } set_desc_trans_len(desc, journal->j_len); set_desc_mount_id(desc, journal->j_mount_id); set_desc_trans_id(desc, journal->j_trans_id); set_commit_trans_len(commit, journal->j_len); /* * special check in case all buffers in the journal * were marked for not logging */ BUG_ON(journal->j_len == 0); /* * we're about to dirty all the log blocks, mark the description block * dirty now too. Don't mark the commit block dirty until all the * others are on disk */ mark_buffer_dirty(d_bh); /* * first data block is j_start + 1, so add one to * cur_write_start wherever you use it */ cur_write_start = journal->j_start; cn = journal->j_first; jindex = 1; /* start at one so we don't get the desc again */ while (cn) { clear_buffer_journal_new(cn->bh); /* copy all the real blocks into log area. dirty log blocks */ if (buffer_journaled(cn->bh)) { struct buffer_head *tmp_bh; char *addr; struct page *page; tmp_bh = journal_getblk(sb, SB_ONDISK_JOURNAL_1st_BLOCK(sb) + ((cur_write_start + jindex) % SB_ONDISK_JOURNAL_SIZE(sb))); set_buffer_uptodate(tmp_bh); page = cn->bh->b_page; addr = kmap(page); memcpy(tmp_bh->b_data, addr + offset_in_page(cn->bh->b_data), cn->bh->b_size); kunmap(page); mark_buffer_dirty(tmp_bh); jindex++; set_buffer_journal_dirty(cn->bh); clear_buffer_journaled(cn->bh); } else { /* * JDirty cleared sometime during transaction. * don't log this one */ reiserfs_warning(sb, "journal-2048", "BAD, buffer in journal hash, " "but not JDirty!"); brelse(cn->bh); } next = cn->next; free_cnode(sb, cn); cn = next; reiserfs_cond_resched(sb); } /* * we are done with both the c_bh and d_bh, but * c_bh must be written after all other commit blocks, * so we dirty/relse c_bh in flush_commit_list, with commit_left <= 1. */ journal->j_current_jl = alloc_journal_list(sb); /* now it is safe to insert this transaction on the main list */ list_add_tail(&jl->j_list, &journal->j_journal_list); list_add_tail(&jl->j_working_list, &journal->j_working_list); journal->j_num_work_lists++; /* reset journal values for the next transaction */ journal->j_start = (journal->j_start + journal->j_len + 2) % SB_ONDISK_JOURNAL_SIZE(sb); atomic_set(&journal->j_wcount, 0); journal->j_bcount = 0; journal->j_last = NULL; journal->j_first = NULL; journal->j_len = 0; journal->j_trans_start_time = 0; /* check for trans_id overflow */ if (++journal->j_trans_id == 0) journal->j_trans_id = 10; journal->j_current_jl->j_trans_id = journal->j_trans_id; journal->j_must_wait = 0; journal->j_len_alloc = 0; journal->j_next_full_flush = 0; journal->j_next_async_flush = 0; init_journal_hash(sb); /* * make sure reiserfs_add_jh sees the new current_jl before we * write out the tails */ smp_mb(); /* * tail conversion targets have to hit the disk before we end the * transaction. Otherwise a later transaction might repack the tail * before this transaction commits, leaving the data block unflushed * and clean, if we crash before the later transaction commits, the * data block is lost. */ if (!list_empty(&jl->j_tail_bh_list)) { depth = reiserfs_write_unlock_nested(sb); write_ordered_buffers(&journal->j_dirty_buffers_lock, journal, jl, &jl->j_tail_bh_list); reiserfs_write_lock_nested(sb, depth); } BUG_ON(!list_empty(&jl->j_tail_bh_list)); mutex_unlock(&jl->j_commit_mutex); /* * honor the flush wishes from the caller, simple commits can * be done outside the journal lock, they are done below * * if we don't flush the commit list right now, we put it into * the work queue so the people waiting on the async progress work * queue don't wait for this proc to flush journal lists and such. */ if (flush) { flush_commit_list(sb, jl, 1); flush_journal_list(sb, jl, 1); } else if (!(jl->j_state & LIST_COMMIT_PENDING)) { /* * Avoid queueing work when sb is being shut down. Transaction * will be flushed on journal shutdown. */ if (sb->s_flags & SB_ACTIVE) queue_delayed_work(REISERFS_SB(sb)->commit_wq, &journal->j_work, HZ / 10); } /* * if the next transaction has any chance of wrapping, flush * transactions that might get overwritten. If any journal lists * are very old flush them as well. */ first_jl: list_for_each_safe(entry, safe, &journal->j_journal_list) { temp_jl = JOURNAL_LIST_ENTRY(entry); if (journal->j_start <= temp_jl->j_start) { if ((journal->j_start + journal->j_trans_max + 1) >= temp_jl->j_start) { flush_used_journal_lists(sb, temp_jl); goto first_jl; } else if ((journal->j_start + journal->j_trans_max + 1) < SB_ONDISK_JOURNAL_SIZE(sb)) { /* * if we don't cross into the next * transaction and we don't wrap, there is * no way we can overlap any later transactions * break now */ break; } } else if ((journal->j_start + journal->j_trans_max + 1) > SB_ONDISK_JOURNAL_SIZE(sb)) { if (((journal->j_start + journal->j_trans_max + 1) % SB_ONDISK_JOURNAL_SIZE(sb)) >= temp_jl->j_start) { flush_used_journal_lists(sb, temp_jl); goto first_jl; } else { /* * we don't overlap anything from out start * to the end of the log, and our wrapped * portion doesn't overlap anything at * the start of the log. We can break */ break; } } } journal->j_current_jl->j_list_bitmap = get_list_bitmap(sb, journal->j_current_jl); if (!(journal->j_current_jl->j_list_bitmap)) { reiserfs_panic(sb, "journal-1996", "could not get a list bitmap"); } atomic_set(&journal->j_jlock, 0); unlock_journal(sb); /* wake up any body waiting to join. */ clear_bit(J_WRITERS_QUEUED, &journal->j_state); wake_up(&journal->j_join_wait); if (!flush && wait_on_commit && journal_list_still_alive(sb, commit_trans_id)) { flush_commit_list(sb, jl, 1); } out: reiserfs_check_lock_depth(sb, "journal end2"); memset(th, 0, sizeof(*th)); /* * Re-set th->t_super, so we can properly keep track of how many * persistent transactions there are. We need to do this so if this * call is part of a failed restart_transaction, we can free it later */ th->t_super = sb; return journal->j_errno; } /* Send the file system read only and refuse new transactions */ void reiserfs_abort_journal(struct super_block *sb, int errno) { struct reiserfs_journal *journal = SB_JOURNAL(sb); if (test_bit(J_ABORTED, &journal->j_state)) return; if (!journal->j_errno) journal->j_errno = errno; sb->s_flags |= SB_RDONLY; set_bit(J_ABORTED, &journal->j_state); #ifdef CONFIG_REISERFS_CHECK dump_stack(); #endif }
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