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fs/nilfs2/segment.c
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/* * segment.c - NILFS segment constructor. * * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * |
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* Written by Ryusuke Konishi. |
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* */ #include <linux/pagemap.h> #include <linux/buffer_head.h> #include <linux/writeback.h> |
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#include <linux/bitops.h> |
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#include <linux/bio.h> #include <linux/completion.h> #include <linux/blkdev.h> #include <linux/backing-dev.h> #include <linux/freezer.h> #include <linux/kthread.h> #include <linux/crc32.h> #include <linux/pagevec.h> |
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#include <linux/slab.h> |
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#include <linux/sched/signal.h> |
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#include "nilfs.h" #include "btnode.h" #include "page.h" #include "segment.h" #include "sufile.h" #include "cpfile.h" #include "ifile.h" |
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#include "segbuf.h" /* * Segment constructor */ #define SC_N_INODEVEC 16 /* Size of locally allocated inode vector */ |
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#define SC_MAX_SEGDELTA 64 /* * Upper limit of the number of segments * appended in collection retry loop */ |
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/* Construction mode */ enum { SC_LSEG_SR = 1, /* Make a logical segment having a super root */ |
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SC_LSEG_DSYNC, /* * Flush data blocks of a given file and make * a logical segment without a super root. */ SC_FLUSH_FILE, /* * Flush data files, leads to segment writes without * creating a checkpoint. */ SC_FLUSH_DAT, /* * Flush DAT file. This also creates segments * without a checkpoint. */ |
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}; /* Stage numbers of dirty block collection */ enum { NILFS_ST_INIT = 0, NILFS_ST_GC, /* Collecting dirty blocks for GC */ NILFS_ST_FILE, |
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NILFS_ST_IFILE, NILFS_ST_CPFILE, NILFS_ST_SUFILE, NILFS_ST_DAT, NILFS_ST_SR, /* Super root */ NILFS_ST_DSYNC, /* Data sync blocks */ NILFS_ST_DONE, }; |
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#define CREATE_TRACE_POINTS #include <trace/events/nilfs2.h> /* * nilfs_sc_cstage_inc(), nilfs_sc_cstage_set(), nilfs_sc_cstage_get() are * wrapper functions of stage count (nilfs_sc_info->sc_stage.scnt). Users of * the variable must use them because transition of stage count must involve * trace events (trace_nilfs2_collection_stage_transition). * * nilfs_sc_cstage_get() isn't required for the above purpose because it doesn't * produce tracepoint events. It is provided just for making the intention * clear. */ static inline void nilfs_sc_cstage_inc(struct nilfs_sc_info *sci) { sci->sc_stage.scnt++; trace_nilfs2_collection_stage_transition(sci); } static inline void nilfs_sc_cstage_set(struct nilfs_sc_info *sci, int next_scnt) { sci->sc_stage.scnt = next_scnt; trace_nilfs2_collection_stage_transition(sci); } static inline int nilfs_sc_cstage_get(struct nilfs_sc_info *sci) { return sci->sc_stage.scnt; } |
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/* State flags of collection */ #define NILFS_CF_NODE 0x0001 /* Collecting node blocks */ #define NILFS_CF_IFILE_STARTED 0x0002 /* IFILE stage has started */ |
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#define NILFS_CF_SUFREED 0x0004 /* segment usages has been freed */ #define NILFS_CF_HISTORY_MASK (NILFS_CF_IFILE_STARTED | NILFS_CF_SUFREED) |
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/* Operations depending on the construction mode and file type */ struct nilfs_sc_operations { int (*collect_data)(struct nilfs_sc_info *, struct buffer_head *, struct inode *); int (*collect_node)(struct nilfs_sc_info *, struct buffer_head *, struct inode *); int (*collect_bmap)(struct nilfs_sc_info *, struct buffer_head *, struct inode *); void (*write_data_binfo)(struct nilfs_sc_info *, struct nilfs_segsum_pointer *, union nilfs_binfo *); void (*write_node_binfo)(struct nilfs_sc_info *, struct nilfs_segsum_pointer *, union nilfs_binfo *); }; /* * Other definitions */ static void nilfs_segctor_start_timer(struct nilfs_sc_info *); static void nilfs_segctor_do_flush(struct nilfs_sc_info *, int); static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *); |
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static void nilfs_dispose_list(struct the_nilfs *, struct list_head *, int); |
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#define nilfs_cnt32_gt(a, b) \ (typecheck(__u32, a) && typecheck(__u32, b) && \ ((__s32)(b) - (__s32)(a) < 0)) #define nilfs_cnt32_ge(a, b) \ (typecheck(__u32, a) && typecheck(__u32, b) && \ ((__s32)(a) - (__s32)(b) >= 0)) #define nilfs_cnt32_lt(a, b) nilfs_cnt32_gt(b, a) #define nilfs_cnt32_le(a, b) nilfs_cnt32_ge(b, a) |
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static int nilfs_prepare_segment_lock(struct super_block *sb, struct nilfs_transaction_info *ti) |
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{ struct nilfs_transaction_info *cur_ti = current->journal_info; void *save = NULL; if (cur_ti) { if (cur_ti->ti_magic == NILFS_TI_MAGIC) return ++cur_ti->ti_count; |
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/* * If journal_info field is occupied by other FS, * it is saved and will be restored on * nilfs_transaction_commit(). */ |
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nilfs_msg(sb, KERN_WARNING, "journal info from a different FS"); |
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save = current->journal_info; |
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} if (!ti) { ti = kmem_cache_alloc(nilfs_transaction_cachep, GFP_NOFS); if (!ti) return -ENOMEM; ti->ti_flags = NILFS_TI_DYNAMIC_ALLOC; } else { ti->ti_flags = 0; } ti->ti_count = 0; ti->ti_save = save; ti->ti_magic = NILFS_TI_MAGIC; current->journal_info = ti; return 0; } /** * nilfs_transaction_begin - start indivisible file operations. * @sb: super block * @ti: nilfs_transaction_info * @vacancy_check: flags for vacancy rate checks * * nilfs_transaction_begin() acquires a reader/writer semaphore, called * the segment semaphore, to make a segment construction and write tasks |
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* exclusive. The function is used with nilfs_transaction_commit() in pairs. |
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* The region enclosed by these two functions can be nested. To avoid a * deadlock, the semaphore is only acquired or released in the outermost call. * * This function allocates a nilfs_transaction_info struct to keep context * information on it. It is initialized and hooked onto the current task in * the outermost call. If a pre-allocated struct is given to @ti, it is used |
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* instead; otherwise a new struct is assigned from a slab. |
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* * When @vacancy_check flag is set, this function will check the amount of * free space, and will wait for the GC to reclaim disk space if low capacity. * * Return Value: On success, 0 is returned. On error, one of the following * negative error code is returned. * * %-ENOMEM - Insufficient memory available. * |
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* %-ENOSPC - No space left on device */ int nilfs_transaction_begin(struct super_block *sb, struct nilfs_transaction_info *ti, int vacancy_check) { |
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struct the_nilfs *nilfs; |
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int ret = nilfs_prepare_segment_lock(sb, ti); |
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struct nilfs_transaction_info *trace_ti; |
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if (unlikely(ret < 0)) return ret; |
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if (ret > 0) { trace_ti = current->journal_info; trace_nilfs2_transaction_transition(sb, trace_ti, trace_ti->ti_count, trace_ti->ti_flags, TRACE_NILFS2_TRANSACTION_BEGIN); |
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return 0; |
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} |
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sb_start_intwrite(sb); |
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nilfs = sb->s_fs_info; |
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down_read(&nilfs->ns_segctor_sem); if (vacancy_check && nilfs_near_disk_full(nilfs)) { up_read(&nilfs->ns_segctor_sem); ret = -ENOSPC; goto failed; } |
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trace_ti = current->journal_info; trace_nilfs2_transaction_transition(sb, trace_ti, trace_ti->ti_count, trace_ti->ti_flags, TRACE_NILFS2_TRANSACTION_BEGIN); |
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return 0; failed: ti = current->journal_info; current->journal_info = ti->ti_save; if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC) kmem_cache_free(nilfs_transaction_cachep, ti); |
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sb_end_intwrite(sb); |
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return ret; } /** |
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* nilfs_transaction_commit - commit indivisible file operations. |
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* @sb: super block |
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* |
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* nilfs_transaction_commit() releases the read semaphore which is * acquired by nilfs_transaction_begin(). This is only performed * in outermost call of this function. If a commit flag is set, * nilfs_transaction_commit() sets a timer to start the segment * constructor. If a sync flag is set, it starts construction * directly. |
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*/ |
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int nilfs_transaction_commit(struct super_block *sb) |
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{ struct nilfs_transaction_info *ti = current->journal_info; |
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struct the_nilfs *nilfs = sb->s_fs_info; |
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int err = 0; BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC); |
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ti->ti_flags |= NILFS_TI_COMMIT; |
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if (ti->ti_count > 0) { ti->ti_count--; |
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trace_nilfs2_transaction_transition(sb, ti, ti->ti_count, ti->ti_flags, TRACE_NILFS2_TRANSACTION_COMMIT); |
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return 0; } |
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if (nilfs->ns_writer) { struct nilfs_sc_info *sci = nilfs->ns_writer; |
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if (ti->ti_flags & NILFS_TI_COMMIT) nilfs_segctor_start_timer(sci); |
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if (atomic_read(&nilfs->ns_ndirtyblks) > sci->sc_watermark) |
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nilfs_segctor_do_flush(sci, 0); } |
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up_read(&nilfs->ns_segctor_sem); |
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trace_nilfs2_transaction_transition(sb, ti, ti->ti_count, ti->ti_flags, TRACE_NILFS2_TRANSACTION_COMMIT); |
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current->journal_info = ti->ti_save; if (ti->ti_flags & NILFS_TI_SYNC) err = nilfs_construct_segment(sb); if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC) kmem_cache_free(nilfs_transaction_cachep, ti); |
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sb_end_intwrite(sb); |
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return err; } |
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void nilfs_transaction_abort(struct super_block *sb) { struct nilfs_transaction_info *ti = current->journal_info; |
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struct the_nilfs *nilfs = sb->s_fs_info; |
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BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC); if (ti->ti_count > 0) { ti->ti_count--; |
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trace_nilfs2_transaction_transition(sb, ti, ti->ti_count, ti->ti_flags, TRACE_NILFS2_TRANSACTION_ABORT); |
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return; } |
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up_read(&nilfs->ns_segctor_sem); |
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trace_nilfs2_transaction_transition(sb, ti, ti->ti_count, ti->ti_flags, TRACE_NILFS2_TRANSACTION_ABORT); |
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current->journal_info = ti->ti_save; if (ti->ti_flags & NILFS_TI_DYNAMIC_ALLOC) kmem_cache_free(nilfs_transaction_cachep, ti); |
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sb_end_intwrite(sb); |
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} |
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void nilfs_relax_pressure_in_lock(struct super_block *sb) { |
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struct the_nilfs *nilfs = sb->s_fs_info; |
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struct nilfs_sc_info *sci = nilfs->ns_writer; |
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if (!sci || !sci->sc_flush_request) return; set_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags); up_read(&nilfs->ns_segctor_sem); down_write(&nilfs->ns_segctor_sem); if (sci->sc_flush_request && test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags)) { struct nilfs_transaction_info *ti = current->journal_info; ti->ti_flags |= NILFS_TI_WRITER; nilfs_segctor_do_immediate_flush(sci); ti->ti_flags &= ~NILFS_TI_WRITER; } downgrade_write(&nilfs->ns_segctor_sem); } |
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static void nilfs_transaction_lock(struct super_block *sb, |
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struct nilfs_transaction_info *ti, int gcflag) { struct nilfs_transaction_info *cur_ti = current->journal_info; |
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struct the_nilfs *nilfs = sb->s_fs_info; |
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struct nilfs_sc_info *sci = nilfs->ns_writer; |
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WARN_ON(cur_ti); |
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ti->ti_flags = NILFS_TI_WRITER; ti->ti_count = 0; ti->ti_save = cur_ti; ti->ti_magic = NILFS_TI_MAGIC; |
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current->journal_info = ti; for (;;) { |
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trace_nilfs2_transaction_transition(sb, ti, ti->ti_count, ti->ti_flags, TRACE_NILFS2_TRANSACTION_TRYLOCK); |
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down_write(&nilfs->ns_segctor_sem); if (!test_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags)) |
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break; |
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nilfs_segctor_do_immediate_flush(sci); |
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up_write(&nilfs->ns_segctor_sem); |
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cond_resched(); |
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} if (gcflag) ti->ti_flags |= NILFS_TI_GC; |
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trace_nilfs2_transaction_transition(sb, ti, ti->ti_count, ti->ti_flags, TRACE_NILFS2_TRANSACTION_LOCK); |
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} |
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static void nilfs_transaction_unlock(struct super_block *sb) |
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{ struct nilfs_transaction_info *ti = current->journal_info; |
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struct the_nilfs *nilfs = sb->s_fs_info; |
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BUG_ON(ti == NULL || ti->ti_magic != NILFS_TI_MAGIC); BUG_ON(ti->ti_count > 0); |
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up_write(&nilfs->ns_segctor_sem); |
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current->journal_info = ti->ti_save; |
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trace_nilfs2_transaction_transition(sb, ti, ti->ti_count, ti->ti_flags, TRACE_NILFS2_TRANSACTION_UNLOCK); |
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} static void *nilfs_segctor_map_segsum_entry(struct nilfs_sc_info *sci, struct nilfs_segsum_pointer *ssp, |
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unsigned int bytes) |
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{ struct nilfs_segment_buffer *segbuf = sci->sc_curseg; |
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unsigned int blocksize = sci->sc_super->s_blocksize; |
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void *p; if (unlikely(ssp->offset + bytes > blocksize)) { ssp->offset = 0; BUG_ON(NILFS_SEGBUF_BH_IS_LAST(ssp->bh, &segbuf->sb_segsum_buffers)); ssp->bh = NILFS_SEGBUF_NEXT_BH(ssp->bh); } p = ssp->bh->b_data + ssp->offset; ssp->offset += bytes; return p; } /** * nilfs_segctor_reset_segment_buffer - reset the current segment buffer * @sci: nilfs_sc_info */ static int nilfs_segctor_reset_segment_buffer(struct nilfs_sc_info *sci) { struct nilfs_segment_buffer *segbuf = sci->sc_curseg; struct buffer_head *sumbh; |
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unsigned int sumbytes; unsigned int flags = 0; |
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int err; if (nilfs_doing_gc()) flags = NILFS_SS_GC; |
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err = nilfs_segbuf_reset(segbuf, flags, sci->sc_seg_ctime, sci->sc_cno); |
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if (unlikely(err)) return err; sumbh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers); sumbytes = segbuf->sb_sum.sumbytes; sci->sc_finfo_ptr.bh = sumbh; sci->sc_finfo_ptr.offset = sumbytes; sci->sc_binfo_ptr.bh = sumbh; sci->sc_binfo_ptr.offset = sumbytes; sci->sc_blk_cnt = sci->sc_datablk_cnt = 0; return 0; } static int nilfs_segctor_feed_segment(struct nilfs_sc_info *sci) { sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks; if (NILFS_SEGBUF_IS_LAST(sci->sc_curseg, &sci->sc_segbufs)) |
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return -E2BIG; /* * The current segment is filled up * (internal code) */ |
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sci->sc_curseg = NILFS_NEXT_SEGBUF(sci->sc_curseg); return nilfs_segctor_reset_segment_buffer(sci); } static int nilfs_segctor_add_super_root(struct nilfs_sc_info *sci) { struct nilfs_segment_buffer *segbuf = sci->sc_curseg; int err; if (segbuf->sb_sum.nblocks >= segbuf->sb_rest_blocks) { err = nilfs_segctor_feed_segment(sci); if (err) return err; segbuf = sci->sc_curseg; } |
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err = nilfs_segbuf_extend_payload(segbuf, &segbuf->sb_super_root); |
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if (likely(!err)) segbuf->sb_sum.flags |= NILFS_SS_SR; return err; } /* * Functions for making segment summary and payloads */ static int nilfs_segctor_segsum_block_required( struct nilfs_sc_info *sci, const struct nilfs_segsum_pointer *ssp, |
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unsigned int binfo_size) |
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{ |
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unsigned int blocksize = sci->sc_super->s_blocksize; |
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/* Size of finfo and binfo is enough small against blocksize */ return ssp->offset + binfo_size + (!sci->sc_blk_cnt ? sizeof(struct nilfs_finfo) : 0) > blocksize; } static void nilfs_segctor_begin_finfo(struct nilfs_sc_info *sci, struct inode *inode) { sci->sc_curseg->sb_sum.nfinfo++; sci->sc_binfo_ptr = sci->sc_finfo_ptr; nilfs_segctor_map_segsum_entry( sci, &sci->sc_binfo_ptr, sizeof(struct nilfs_finfo)); |
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if (NILFS_I(inode)->i_root && !test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags)) |
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set_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags); |
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/* skip finfo */ } static void nilfs_segctor_end_finfo(struct nilfs_sc_info *sci, struct inode *inode) { struct nilfs_finfo *finfo; struct nilfs_inode_info *ii; struct nilfs_segment_buffer *segbuf; |
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__u64 cno; |
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if (sci->sc_blk_cnt == 0) return; ii = NILFS_I(inode); |
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if (test_bit(NILFS_I_GCINODE, &ii->i_state)) cno = ii->i_cno; else if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) cno = 0; else cno = sci->sc_cno; |
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finfo = nilfs_segctor_map_segsum_entry(sci, &sci->sc_finfo_ptr, sizeof(*finfo)); finfo->fi_ino = cpu_to_le64(inode->i_ino); finfo->fi_nblocks = cpu_to_le32(sci->sc_blk_cnt); finfo->fi_ndatablk = cpu_to_le32(sci->sc_datablk_cnt); |
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finfo->fi_cno = cpu_to_le64(cno); |
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segbuf = sci->sc_curseg; segbuf->sb_sum.sumbytes = sci->sc_binfo_ptr.offset + sci->sc_super->s_blocksize * (segbuf->sb_sum.nsumblk - 1); sci->sc_finfo_ptr = sci->sc_binfo_ptr; sci->sc_blk_cnt = sci->sc_datablk_cnt = 0; } static int nilfs_segctor_add_file_block(struct nilfs_sc_info *sci, struct buffer_head *bh, struct inode *inode, |
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unsigned int binfo_size) |
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{ struct nilfs_segment_buffer *segbuf; int required, err = 0; retry: segbuf = sci->sc_curseg; required = nilfs_segctor_segsum_block_required( sci, &sci->sc_binfo_ptr, binfo_size); if (segbuf->sb_sum.nblocks + required + 1 > segbuf->sb_rest_blocks) { nilfs_segctor_end_finfo(sci, inode); err = nilfs_segctor_feed_segment(sci); if (err) return err; goto retry; } if (unlikely(required)) { err = nilfs_segbuf_extend_segsum(segbuf); if (unlikely(err)) goto failed; } if (sci->sc_blk_cnt == 0) nilfs_segctor_begin_finfo(sci, inode); nilfs_segctor_map_segsum_entry(sci, &sci->sc_binfo_ptr, binfo_size); /* Substitution to vblocknr is delayed until update_blocknr() */ nilfs_segbuf_add_file_buffer(segbuf, bh); sci->sc_blk_cnt++; failed: return err; } |
9ff05123e
|
557 558 559 560 561 562 563 |
/* * Callback functions that enumerate, mark, and collect dirty blocks */ static int nilfs_collect_file_data(struct nilfs_sc_info *sci, struct buffer_head *bh, struct inode *inode) { int err; |
9ff05123e
|
564 |
err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh); |
e828949e5
|
565 566 |
if (err < 0) return err; |
9ff05123e
|
567 568 569 570 571 572 573 574 575 576 577 578 |
err = nilfs_segctor_add_file_block(sci, bh, inode, sizeof(struct nilfs_binfo_v)); if (!err) sci->sc_datablk_cnt++; return err; } static int nilfs_collect_file_node(struct nilfs_sc_info *sci, struct buffer_head *bh, struct inode *inode) { |
e828949e5
|
579 |
return nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh); |
9ff05123e
|
580 581 582 583 584 585 |
} static int nilfs_collect_file_bmap(struct nilfs_sc_info *sci, struct buffer_head *bh, struct inode *inode) { |
1f5abe7e7
|
586 |
WARN_ON(!buffer_dirty(bh)); |
9ff05123e
|
587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 |
return nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64)); } static void nilfs_write_file_data_binfo(struct nilfs_sc_info *sci, struct nilfs_segsum_pointer *ssp, union nilfs_binfo *binfo) { struct nilfs_binfo_v *binfo_v = nilfs_segctor_map_segsum_entry( sci, ssp, sizeof(*binfo_v)); *binfo_v = binfo->bi_v; } static void nilfs_write_file_node_binfo(struct nilfs_sc_info *sci, struct nilfs_segsum_pointer *ssp, union nilfs_binfo *binfo) { __le64 *vblocknr = nilfs_segctor_map_segsum_entry( sci, ssp, sizeof(*vblocknr)); *vblocknr = binfo->bi_v.bi_vblocknr; } |
1c613cb98
|
607 |
static const struct nilfs_sc_operations nilfs_sc_file_ops = { |
9ff05123e
|
608 609 610 611 612 613 614 615 616 617 618 619 620 |
.collect_data = nilfs_collect_file_data, .collect_node = nilfs_collect_file_node, .collect_bmap = nilfs_collect_file_bmap, .write_data_binfo = nilfs_write_file_data_binfo, .write_node_binfo = nilfs_write_file_node_binfo, }; static int nilfs_collect_dat_data(struct nilfs_sc_info *sci, struct buffer_head *bh, struct inode *inode) { int err; err = nilfs_bmap_propagate(NILFS_I(inode)->i_bmap, bh); |
e828949e5
|
621 622 |
if (err < 0) return err; |
9ff05123e
|
623 624 625 626 627 628 629 630 631 632 |
err = nilfs_segctor_add_file_block(sci, bh, inode, sizeof(__le64)); if (!err) sci->sc_datablk_cnt++; return err; } static int nilfs_collect_dat_bmap(struct nilfs_sc_info *sci, struct buffer_head *bh, struct inode *inode) { |
1f5abe7e7
|
633 |
WARN_ON(!buffer_dirty(bh)); |
9ff05123e
|
634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 |
return nilfs_segctor_add_file_block(sci, bh, inode, sizeof(struct nilfs_binfo_dat)); } static void nilfs_write_dat_data_binfo(struct nilfs_sc_info *sci, struct nilfs_segsum_pointer *ssp, union nilfs_binfo *binfo) { __le64 *blkoff = nilfs_segctor_map_segsum_entry(sci, ssp, sizeof(*blkoff)); *blkoff = binfo->bi_dat.bi_blkoff; } static void nilfs_write_dat_node_binfo(struct nilfs_sc_info *sci, struct nilfs_segsum_pointer *ssp, union nilfs_binfo *binfo) { struct nilfs_binfo_dat *binfo_dat = nilfs_segctor_map_segsum_entry(sci, ssp, sizeof(*binfo_dat)); *binfo_dat = binfo->bi_dat; } |
1c613cb98
|
655 |
static const struct nilfs_sc_operations nilfs_sc_dat_ops = { |
9ff05123e
|
656 657 658 659 660 661 |
.collect_data = nilfs_collect_dat_data, .collect_node = nilfs_collect_file_node, .collect_bmap = nilfs_collect_dat_bmap, .write_data_binfo = nilfs_write_dat_data_binfo, .write_node_binfo = nilfs_write_dat_node_binfo, }; |
1c613cb98
|
662 |
static const struct nilfs_sc_operations nilfs_sc_dsync_ops = { |
9ff05123e
|
663 664 665 666 667 668 |
.collect_data = nilfs_collect_file_data, .collect_node = NULL, .collect_bmap = NULL, .write_data_binfo = nilfs_write_file_data_binfo, .write_node_binfo = NULL, }; |
f30bf3e40
|
669 670 671 672 |
static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode, struct list_head *listp, size_t nlimit, loff_t start, loff_t end) |
9ff05123e
|
673 |
{ |
9ff05123e
|
674 675 |
struct address_space *mapping = inode->i_mapping; struct pagevec pvec; |
f30bf3e40
|
676 677 678 |
pgoff_t index = 0, last = ULONG_MAX; size_t ndirties = 0; int i; |
9ff05123e
|
679 |
|
f30bf3e40
|
680 681 682 683 684 685 686 687 688 |
if (unlikely(start != 0 || end != LLONG_MAX)) { /* * A valid range is given for sync-ing data pages. The * range is rounded to per-page; extra dirty buffers * may be included if blocksize < pagesize. */ index = start >> PAGE_SHIFT; last = end >> PAGE_SHIFT; } |
9ff05123e
|
689 690 |
pagevec_init(&pvec, 0); repeat: |
f30bf3e40
|
691 692 693 694 695 |
if (unlikely(index > last) || !pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY, min_t(pgoff_t, last - index, PAGEVEC_SIZE - 1) + 1)) return ndirties; |
9ff05123e
|
696 697 698 699 |
for (i = 0; i < pagevec_count(&pvec); i++) { struct buffer_head *bh, *head; struct page *page = pvec.pages[i]; |
f30bf3e40
|
700 701 |
if (unlikely(page->index > last)) break; |
aa405b1f4
|
702 703 |
lock_page(page); if (!page_has_buffers(page)) |
93407472a
|
704 |
create_empty_buffers(page, i_blocksize(inode), 0); |
aa405b1f4
|
705 |
unlock_page(page); |
9ff05123e
|
706 707 708 |
bh = head = page_buffers(page); do { |
7f42ec394
|
709 |
if (!buffer_dirty(bh) || buffer_async_write(bh)) |
f30bf3e40
|
710 711 712 713 714 715 716 717 |
continue; get_bh(bh); list_add_tail(&bh->b_assoc_buffers, listp); ndirties++; if (unlikely(ndirties >= nlimit)) { pagevec_release(&pvec); cond_resched(); return ndirties; |
9ff05123e
|
718 |
} |
f30bf3e40
|
719 |
} while (bh = bh->b_this_page, bh != head); |
9ff05123e
|
720 721 722 |
} pagevec_release(&pvec); cond_resched(); |
f30bf3e40
|
723 |
goto repeat; |
9ff05123e
|
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 |
} static void nilfs_lookup_dirty_node_buffers(struct inode *inode, struct list_head *listp) { struct nilfs_inode_info *ii = NILFS_I(inode); struct address_space *mapping = &ii->i_btnode_cache; struct pagevec pvec; struct buffer_head *bh, *head; unsigned int i; pgoff_t index = 0; pagevec_init(&pvec, 0); while (pagevec_lookup_tag(&pvec, mapping, &index, PAGECACHE_TAG_DIRTY, PAGEVEC_SIZE)) { for (i = 0; i < pagevec_count(&pvec); i++) { bh = head = page_buffers(pvec.pages[i]); do { |
7f42ec394
|
743 744 |
if (buffer_dirty(bh) && !buffer_async_write(bh)) { |
9ff05123e
|
745 746 747 748 749 750 751 752 753 754 755 |
get_bh(bh); list_add_tail(&bh->b_assoc_buffers, listp); } bh = bh->b_this_page; } while (bh != head); } pagevec_release(&pvec); cond_resched(); } } |
693dd3212
|
756 |
static void nilfs_dispose_list(struct the_nilfs *nilfs, |
9ff05123e
|
757 758 759 760 |
struct list_head *head, int force) { struct nilfs_inode_info *ii, *n; struct nilfs_inode_info *ivec[SC_N_INODEVEC], **pii; |
0c6c44cb9
|
761 |
unsigned int nv = 0; |
9ff05123e
|
762 763 |
while (!list_empty(head)) { |
693dd3212
|
764 |
spin_lock(&nilfs->ns_inode_lock); |
9ff05123e
|
765 766 767 768 769 770 771 772 773 774 |
list_for_each_entry_safe(ii, n, head, i_dirty) { list_del_init(&ii->i_dirty); if (force) { if (unlikely(ii->i_bh)) { brelse(ii->i_bh); ii->i_bh = NULL; } } else if (test_bit(NILFS_I_DIRTY, &ii->i_state)) { set_bit(NILFS_I_QUEUED, &ii->i_state); list_add_tail(&ii->i_dirty, |
693dd3212
|
775 |
&nilfs->ns_dirty_files); |
9ff05123e
|
776 777 778 779 780 781 |
continue; } ivec[nv++] = ii; if (nv == SC_N_INODEVEC) break; } |
693dd3212
|
782 |
spin_unlock(&nilfs->ns_inode_lock); |
9ff05123e
|
783 784 785 786 787 |
for (pii = ivec; nv > 0; pii++, nv--) iput(&(*pii)->vfs_inode); } } |
7ef3ff2fe
|
788 789 790 791 792 793 794 795 |
static void nilfs_iput_work_func(struct work_struct *work) { struct nilfs_sc_info *sci = container_of(work, struct nilfs_sc_info, sc_iput_work); struct the_nilfs *nilfs = sci->sc_super->s_fs_info; nilfs_dispose_list(nilfs, &sci->sc_iput_queue, 0); } |
e912a5b66
|
796 797 |
static int nilfs_test_metadata_dirty(struct the_nilfs *nilfs, struct nilfs_root *root) |
9ff05123e
|
798 |
{ |
9ff05123e
|
799 |
int ret = 0; |
e912a5b66
|
800 |
if (nilfs_mdt_fetch_dirty(root->ifile)) |
9ff05123e
|
801 802 803 804 805 |
ret++; if (nilfs_mdt_fetch_dirty(nilfs->ns_cpfile)) ret++; if (nilfs_mdt_fetch_dirty(nilfs->ns_sufile)) ret++; |
365e215ce
|
806 807 |
if ((ret || nilfs_doing_gc()) && nilfs_mdt_fetch_dirty(nilfs->ns_dat)) ret++; |
9ff05123e
|
808 809 810 811 812 813 814 |
return ret; } static int nilfs_segctor_clean(struct nilfs_sc_info *sci) { return list_empty(&sci->sc_dirty_files) && !test_bit(NILFS_SC_DIRTY, &sci->sc_flags) && |
071cb4b81
|
815 |
sci->sc_nfreesegs == 0 && |
9ff05123e
|
816 817 818 819 820 |
(!nilfs_doing_gc() || list_empty(&sci->sc_gc_inodes)); } static int nilfs_segctor_confirm(struct nilfs_sc_info *sci) { |
e3154e974
|
821 |
struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123e
|
822 |
int ret = 0; |
693dd3212
|
823 |
if (nilfs_test_metadata_dirty(nilfs, sci->sc_root)) |
9ff05123e
|
824 |
set_bit(NILFS_SC_DIRTY, &sci->sc_flags); |
693dd3212
|
825 826 |
spin_lock(&nilfs->ns_inode_lock); if (list_empty(&nilfs->ns_dirty_files) && nilfs_segctor_clean(sci)) |
9ff05123e
|
827 |
ret++; |
693dd3212
|
828 |
spin_unlock(&nilfs->ns_inode_lock); |
9ff05123e
|
829 830 831 832 833 |
return ret; } static void nilfs_segctor_clear_metadata_dirty(struct nilfs_sc_info *sci) { |
e3154e974
|
834 |
struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123e
|
835 |
|
e912a5b66
|
836 |
nilfs_mdt_clear_dirty(sci->sc_root->ifile); |
9ff05123e
|
837 838 |
nilfs_mdt_clear_dirty(nilfs->ns_cpfile); nilfs_mdt_clear_dirty(nilfs->ns_sufile); |
365e215ce
|
839 |
nilfs_mdt_clear_dirty(nilfs->ns_dat); |
9ff05123e
|
840 841 842 843 |
} static int nilfs_segctor_create_checkpoint(struct nilfs_sc_info *sci) { |
e3154e974
|
844 |
struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123e
|
845 846 847 848 849 850 851 852 |
struct buffer_head *bh_cp; struct nilfs_checkpoint *raw_cp; int err; /* XXX: this interface will be changed */ err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 1, &raw_cp, &bh_cp); if (likely(!err)) { |
076a378ba
|
853 854 855 856 857 |
/* * The following code is duplicated with cpfile. But, it is * needed to collect the checkpoint even if it was not newly * created. */ |
5fc7b1417
|
858 |
mark_buffer_dirty(bh_cp); |
9ff05123e
|
859 860 861 |
nilfs_mdt_mark_dirty(nilfs->ns_cpfile); nilfs_cpfile_put_checkpoint( nilfs->ns_cpfile, nilfs->ns_cno, bh_cp); |
1f5abe7e7
|
862 863 |
} else WARN_ON(err == -EINVAL || err == -ENOENT); |
9ff05123e
|
864 865 866 867 868 |
return err; } static int nilfs_segctor_fill_in_checkpoint(struct nilfs_sc_info *sci) { |
e3154e974
|
869 |
struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123e
|
870 871 872 873 874 875 876 |
struct buffer_head *bh_cp; struct nilfs_checkpoint *raw_cp; int err; err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, 0, &raw_cp, &bh_cp); if (unlikely(err)) { |
1f5abe7e7
|
877 |
WARN_ON(err == -EINVAL || err == -ENOENT); |
9ff05123e
|
878 879 880 881 882 |
goto failed_ibh; } raw_cp->cp_snapshot_list.ssl_next = 0; raw_cp->cp_snapshot_list.ssl_prev = 0; raw_cp->cp_inodes_count = |
e5f7f8484
|
883 |
cpu_to_le64(atomic64_read(&sci->sc_root->inodes_count)); |
9ff05123e
|
884 |
raw_cp->cp_blocks_count = |
e5f7f8484
|
885 |
cpu_to_le64(atomic64_read(&sci->sc_root->blocks_count)); |
9ff05123e
|
886 887 888 889 |
raw_cp->cp_nblk_inc = cpu_to_le64(sci->sc_nblk_inc + sci->sc_nblk_this_inc); raw_cp->cp_create = cpu_to_le64(sci->sc_seg_ctime); raw_cp->cp_cno = cpu_to_le64(nilfs->ns_cno); |
458c5b082
|
890 |
|
c96fa464a
|
891 892 893 894 |
if (test_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags)) nilfs_checkpoint_clear_minor(raw_cp); else nilfs_checkpoint_set_minor(raw_cp); |
e912a5b66
|
895 896 |
nilfs_write_inode_common(sci->sc_root->ifile, &raw_cp->cp_ifile_inode, 1); |
9ff05123e
|
897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 |
nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, nilfs->ns_cno, bh_cp); return 0; failed_ibh: return err; } static void nilfs_fill_in_file_bmap(struct inode *ifile, struct nilfs_inode_info *ii) { struct buffer_head *ibh; struct nilfs_inode *raw_inode; if (test_bit(NILFS_I_BMAP, &ii->i_state)) { ibh = ii->i_bh; BUG_ON(!ibh); raw_inode = nilfs_ifile_map_inode(ifile, ii->vfs_inode.i_ino, ibh); nilfs_bmap_write(ii->i_bmap, raw_inode); nilfs_ifile_unmap_inode(ifile, ii->vfs_inode.i_ino, ibh); } } |
e912a5b66
|
920 |
static void nilfs_segctor_fill_in_file_bmap(struct nilfs_sc_info *sci) |
9ff05123e
|
921 922 923 924 |
{ struct nilfs_inode_info *ii; list_for_each_entry(ii, &sci->sc_dirty_files, i_dirty) { |
e912a5b66
|
925 |
nilfs_fill_in_file_bmap(sci->sc_root->ifile, ii); |
9ff05123e
|
926 927 |
set_bit(NILFS_I_COLLECTED, &ii->i_state); } |
9ff05123e
|
928 |
} |
9ff05123e
|
929 930 931 |
static void nilfs_segctor_fill_in_super_root(struct nilfs_sc_info *sci, struct the_nilfs *nilfs) { |
1e2b68bf2
|
932 933 |
struct buffer_head *bh_sr; struct nilfs_super_root *raw_sr; |
0c6c44cb9
|
934 |
unsigned int isz, srsz; |
9ff05123e
|
935 |
|
1e2b68bf2
|
936 937 |
bh_sr = NILFS_LAST_SEGBUF(&sci->sc_segbufs)->sb_super_root; raw_sr = (struct nilfs_super_root *)bh_sr->b_data; |
56eb55388
|
938 939 |
isz = nilfs->ns_inode_size; srsz = NILFS_SR_BYTES(isz); |
1e2b68bf2
|
940 |
|
56eb55388
|
941 |
raw_sr->sr_bytes = cpu_to_le16(srsz); |
9ff05123e
|
942 943 944 945 |
raw_sr->sr_nongc_ctime = cpu_to_le64(nilfs_doing_gc() ? nilfs->ns_nongc_ctime : sci->sc_seg_ctime); raw_sr->sr_flags = 0; |
365e215ce
|
946 |
nilfs_write_inode_common(nilfs->ns_dat, (void *)raw_sr + |
3961f0e27
|
947 948 949 950 951 |
NILFS_SR_DAT_OFFSET(isz), 1); nilfs_write_inode_common(nilfs->ns_cpfile, (void *)raw_sr + NILFS_SR_CPFILE_OFFSET(isz), 1); nilfs_write_inode_common(nilfs->ns_sufile, (void *)raw_sr + NILFS_SR_SUFILE_OFFSET(isz), 1); |
56eb55388
|
952 |
memset((void *)raw_sr + srsz, 0, nilfs->ns_blocksize - srsz); |
9ff05123e
|
953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 |
} static void nilfs_redirty_inodes(struct list_head *head) { struct nilfs_inode_info *ii; list_for_each_entry(ii, head, i_dirty) { if (test_bit(NILFS_I_COLLECTED, &ii->i_state)) clear_bit(NILFS_I_COLLECTED, &ii->i_state); } } static void nilfs_drop_collected_inodes(struct list_head *head) { struct nilfs_inode_info *ii; list_for_each_entry(ii, head, i_dirty) { if (!test_and_clear_bit(NILFS_I_COLLECTED, &ii->i_state)) continue; |
b9f661407
|
972 |
clear_bit(NILFS_I_INODE_SYNC, &ii->i_state); |
9ff05123e
|
973 974 975 |
set_bit(NILFS_I_UPDATED, &ii->i_state); } } |
9ff05123e
|
976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 |
static int nilfs_segctor_apply_buffers(struct nilfs_sc_info *sci, struct inode *inode, struct list_head *listp, int (*collect)(struct nilfs_sc_info *, struct buffer_head *, struct inode *)) { struct buffer_head *bh, *n; int err = 0; if (collect) { list_for_each_entry_safe(bh, n, listp, b_assoc_buffers) { list_del_init(&bh->b_assoc_buffers); err = collect(sci, bh, inode); brelse(bh); if (unlikely(err)) goto dispose_buffers; } return 0; } dispose_buffers: while (!list_empty(listp)) { |
0cc128388
|
999 1000 |
bh = list_first_entry(listp, struct buffer_head, b_assoc_buffers); |
9ff05123e
|
1001 1002 1003 1004 1005 |
list_del_init(&bh->b_assoc_buffers); brelse(bh); } return err; } |
f30bf3e40
|
1006 1007 1008 1009 1010 1011 |
static size_t nilfs_segctor_buffer_rest(struct nilfs_sc_info *sci) { /* Remaining number of blocks within segment buffer */ return sci->sc_segbuf_nblocks - (sci->sc_nblk_this_inc + sci->sc_curseg->sb_sum.nblocks); } |
9ff05123e
|
1012 1013 |
static int nilfs_segctor_scan_file(struct nilfs_sc_info *sci, struct inode *inode, |
1c613cb98
|
1014 |
const struct nilfs_sc_operations *sc_ops) |
9ff05123e
|
1015 1016 1017 |
{ LIST_HEAD(data_buffers); LIST_HEAD(node_buffers); |
f30bf3e40
|
1018 |
int err; |
9ff05123e
|
1019 1020 |
if (!(sci->sc_stage.flags & NILFS_CF_NODE)) { |
f30bf3e40
|
1021 1022 1023 1024 1025 1026 |
size_t n, rest = nilfs_segctor_buffer_rest(sci); n = nilfs_lookup_dirty_data_buffers( inode, &data_buffers, rest + 1, 0, LLONG_MAX); if (n > rest) { err = nilfs_segctor_apply_buffers( |
9ff05123e
|
1027 |
sci, inode, &data_buffers, |
f30bf3e40
|
1028 1029 |
sc_ops->collect_data); BUG_ON(!err); /* always receive -E2BIG or true error */ |
9ff05123e
|
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 |
goto break_or_fail; } } nilfs_lookup_dirty_node_buffers(inode, &node_buffers); if (!(sci->sc_stage.flags & NILFS_CF_NODE)) { err = nilfs_segctor_apply_buffers( sci, inode, &data_buffers, sc_ops->collect_data); if (unlikely(err)) { /* dispose node list */ nilfs_segctor_apply_buffers( sci, inode, &node_buffers, NULL); goto break_or_fail; } sci->sc_stage.flags |= NILFS_CF_NODE; } /* Collect node */ err = nilfs_segctor_apply_buffers( sci, inode, &node_buffers, sc_ops->collect_node); if (unlikely(err)) goto break_or_fail; nilfs_bmap_lookup_dirty_buffers(NILFS_I(inode)->i_bmap, &node_buffers); err = nilfs_segctor_apply_buffers( sci, inode, &node_buffers, sc_ops->collect_bmap); if (unlikely(err)) goto break_or_fail; nilfs_segctor_end_finfo(sci, inode); sci->sc_stage.flags &= ~NILFS_CF_NODE; break_or_fail: return err; } static int nilfs_segctor_scan_file_dsync(struct nilfs_sc_info *sci, struct inode *inode) { LIST_HEAD(data_buffers); |
f30bf3e40
|
1069 1070 |
size_t n, rest = nilfs_segctor_buffer_rest(sci); int err; |
9ff05123e
|
1071 |
|
f30bf3e40
|
1072 1073 1074 1075 1076 1077 1078 |
n = nilfs_lookup_dirty_data_buffers(inode, &data_buffers, rest + 1, sci->sc_dsync_start, sci->sc_dsync_end); err = nilfs_segctor_apply_buffers(sci, inode, &data_buffers, nilfs_collect_file_data); if (!err) { |
9ff05123e
|
1079 |
nilfs_segctor_end_finfo(sci, inode); |
f30bf3e40
|
1080 1081 1082 |
BUG_ON(n > rest); /* always receive -E2BIG or true error if n > rest */ } |
9ff05123e
|
1083 1084 1085 1086 1087 |
return err; } static int nilfs_segctor_collect_blocks(struct nilfs_sc_info *sci, int mode) { |
e3154e974
|
1088 |
struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123e
|
1089 1090 |
struct list_head *head; struct nilfs_inode_info *ii; |
071cb4b81
|
1091 |
size_t ndone; |
9ff05123e
|
1092 |
int err = 0; |
584977038
|
1093 |
switch (nilfs_sc_cstage_get(sci)) { |
9ff05123e
|
1094 1095 1096 1097 1098 1099 1100 1101 |
case NILFS_ST_INIT: /* Pre-processes */ sci->sc_stage.flags = 0; if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) { sci->sc_nblk_inc = 0; sci->sc_curseg->sb_sum.flags = NILFS_SS_LOGBGN; if (mode == SC_LSEG_DSYNC) { |
584977038
|
1102 |
nilfs_sc_cstage_set(sci, NILFS_ST_DSYNC); |
9ff05123e
|
1103 1104 1105 1106 1107 1108 1109 |
goto dsync_mode; } } sci->sc_stage.dirty_file_ptr = NULL; sci->sc_stage.gc_inode_ptr = NULL; if (mode == SC_FLUSH_DAT) { |
584977038
|
1110 |
nilfs_sc_cstage_set(sci, NILFS_ST_DAT); |
9ff05123e
|
1111 1112 |
goto dat_stage; } |
584977038
|
1113 |
nilfs_sc_cstage_inc(sci); /* Fall through */ |
9ff05123e
|
1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 |
case NILFS_ST_GC: if (nilfs_doing_gc()) { head = &sci->sc_gc_inodes; ii = list_prepare_entry(sci->sc_stage.gc_inode_ptr, head, i_dirty); list_for_each_entry_continue(ii, head, i_dirty) { err = nilfs_segctor_scan_file( sci, &ii->vfs_inode, &nilfs_sc_file_ops); if (unlikely(err)) { sci->sc_stage.gc_inode_ptr = list_entry( ii->i_dirty.prev, struct nilfs_inode_info, i_dirty); goto break_or_fail; } set_bit(NILFS_I_COLLECTED, &ii->i_state); } sci->sc_stage.gc_inode_ptr = NULL; } |
584977038
|
1134 |
nilfs_sc_cstage_inc(sci); /* Fall through */ |
9ff05123e
|
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 |
case NILFS_ST_FILE: head = &sci->sc_dirty_files; ii = list_prepare_entry(sci->sc_stage.dirty_file_ptr, head, i_dirty); list_for_each_entry_continue(ii, head, i_dirty) { clear_bit(NILFS_I_DIRTY, &ii->i_state); err = nilfs_segctor_scan_file(sci, &ii->vfs_inode, &nilfs_sc_file_ops); if (unlikely(err)) { sci->sc_stage.dirty_file_ptr = list_entry(ii->i_dirty.prev, struct nilfs_inode_info, i_dirty); goto break_or_fail; } /* sci->sc_stage.dirty_file_ptr = NILFS_I(inode); */ /* XXX: required ? */ } sci->sc_stage.dirty_file_ptr = NULL; if (mode == SC_FLUSH_FILE) { |
584977038
|
1156 |
nilfs_sc_cstage_set(sci, NILFS_ST_DONE); |
9ff05123e
|
1157 1158 |
return 0; } |
584977038
|
1159 |
nilfs_sc_cstage_inc(sci); |
9ff05123e
|
1160 1161 1162 |
sci->sc_stage.flags |= NILFS_CF_IFILE_STARTED; /* Fall through */ case NILFS_ST_IFILE: |
e912a5b66
|
1163 |
err = nilfs_segctor_scan_file(sci, sci->sc_root->ifile, |
9ff05123e
|
1164 1165 1166 |
&nilfs_sc_file_ops); if (unlikely(err)) break; |
584977038
|
1167 |
nilfs_sc_cstage_inc(sci); |
9ff05123e
|
1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 |
/* Creating a checkpoint */ err = nilfs_segctor_create_checkpoint(sci); if (unlikely(err)) break; /* Fall through */ case NILFS_ST_CPFILE: err = nilfs_segctor_scan_file(sci, nilfs->ns_cpfile, &nilfs_sc_file_ops); if (unlikely(err)) break; |
584977038
|
1178 |
nilfs_sc_cstage_inc(sci); /* Fall through */ |
9ff05123e
|
1179 |
case NILFS_ST_SUFILE: |
071cb4b81
|
1180 1181 1182 1183 1184 1185 |
err = nilfs_sufile_freev(nilfs->ns_sufile, sci->sc_freesegs, sci->sc_nfreesegs, &ndone); if (unlikely(err)) { nilfs_sufile_cancel_freev(nilfs->ns_sufile, sci->sc_freesegs, ndone, NULL); |
9ff05123e
|
1186 |
break; |
071cb4b81
|
1187 1188 |
} sci->sc_stage.flags |= NILFS_CF_SUFREED; |
9ff05123e
|
1189 1190 1191 1192 |
err = nilfs_segctor_scan_file(sci, nilfs->ns_sufile, &nilfs_sc_file_ops); if (unlikely(err)) break; |
584977038
|
1193 |
nilfs_sc_cstage_inc(sci); /* Fall through */ |
9ff05123e
|
1194 1195 |
case NILFS_ST_DAT: dat_stage: |
365e215ce
|
1196 |
err = nilfs_segctor_scan_file(sci, nilfs->ns_dat, |
9ff05123e
|
1197 1198 1199 1200 |
&nilfs_sc_dat_ops); if (unlikely(err)) break; if (mode == SC_FLUSH_DAT) { |
584977038
|
1201 |
nilfs_sc_cstage_set(sci, NILFS_ST_DONE); |
9ff05123e
|
1202 1203 |
return 0; } |
584977038
|
1204 |
nilfs_sc_cstage_inc(sci); /* Fall through */ |
9ff05123e
|
1205 1206 1207 1208 1209 1210 1211 1212 1213 |
case NILFS_ST_SR: if (mode == SC_LSEG_SR) { /* Appending a super root */ err = nilfs_segctor_add_super_root(sci); if (unlikely(err)) break; } /* End of a logical segment */ sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND; |
584977038
|
1214 |
nilfs_sc_cstage_set(sci, NILFS_ST_DONE); |
9ff05123e
|
1215 1216 1217 1218 |
return 0; case NILFS_ST_DSYNC: dsync_mode: sci->sc_curseg->sb_sum.flags |= NILFS_SS_SYNDT; |
f30bf3e40
|
1219 |
ii = sci->sc_dsync_inode; |
9ff05123e
|
1220 1221 1222 1223 1224 1225 |
if (!test_bit(NILFS_I_BUSY, &ii->i_state)) break; err = nilfs_segctor_scan_file_dsync(sci, &ii->vfs_inode); if (unlikely(err)) break; |
9ff05123e
|
1226 |
sci->sc_curseg->sb_sum.flags |= NILFS_SS_LOGEND; |
584977038
|
1227 |
nilfs_sc_cstage_set(sci, NILFS_ST_DONE); |
9ff05123e
|
1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 |
return 0; case NILFS_ST_DONE: return 0; default: BUG(); } break_or_fail: return err; } |
a694291a6
|
1238 1239 1240 1241 1242 |
/** * nilfs_segctor_begin_construction - setup segment buffer to make a new log * @sci: nilfs_sc_info * @nilfs: nilfs object */ |
9ff05123e
|
1243 1244 1245 |
static int nilfs_segctor_begin_construction(struct nilfs_sc_info *sci, struct the_nilfs *nilfs) { |
a694291a6
|
1246 |
struct nilfs_segment_buffer *segbuf, *prev; |
9ff05123e
|
1247 |
__u64 nextnum; |
a694291a6
|
1248 |
int err, alloc = 0; |
9ff05123e
|
1249 |
|
a694291a6
|
1250 1251 1252 |
segbuf = nilfs_segbuf_new(sci->sc_super); if (unlikely(!segbuf)) return -ENOMEM; |
9ff05123e
|
1253 |
|
a694291a6
|
1254 1255 1256 1257 1258 1259 1260 |
if (list_empty(&sci->sc_write_logs)) { nilfs_segbuf_map(segbuf, nilfs->ns_segnum, nilfs->ns_pseg_offset, nilfs); if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) { nilfs_shift_to_next_segment(nilfs); nilfs_segbuf_map(segbuf, nilfs->ns_segnum, 0, nilfs); } |
9ff05123e
|
1261 |
|
a694291a6
|
1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 |
segbuf->sb_sum.seg_seq = nilfs->ns_seg_seq; nextnum = nilfs->ns_nextnum; if (nilfs->ns_segnum == nilfs->ns_nextnum) /* Start from the head of a new full segment */ alloc++; } else { /* Continue logs */ prev = NILFS_LAST_SEGBUF(&sci->sc_write_logs); nilfs_segbuf_map_cont(segbuf, prev); segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq; nextnum = prev->sb_nextnum; if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) { nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs); segbuf->sb_sum.seg_seq++; alloc++; } |
9ff05123e
|
1280 |
} |
9ff05123e
|
1281 |
|
61a189e9c
|
1282 |
err = nilfs_sufile_mark_dirty(nilfs->ns_sufile, segbuf->sb_segnum); |
a694291a6
|
1283 1284 |
if (err) goto failed; |
9ff05123e
|
1285 |
|
a694291a6
|
1286 |
if (alloc) { |
cece55207
|
1287 |
err = nilfs_sufile_alloc(nilfs->ns_sufile, &nextnum); |
a694291a6
|
1288 1289 1290 |
if (err) goto failed; } |
9ff05123e
|
1291 |
nilfs_segbuf_set_next_segnum(segbuf, nextnum, nilfs); |
a694291a6
|
1292 1293 1294 |
BUG_ON(!list_empty(&sci->sc_segbufs)); list_add_tail(&segbuf->sb_list, &sci->sc_segbufs); sci->sc_segbuf_nblocks = segbuf->sb_rest_blocks; |
cece55207
|
1295 |
return 0; |
a694291a6
|
1296 1297 1298 1299 |
failed: nilfs_segbuf_free(segbuf); return err; |
9ff05123e
|
1300 1301 1302 1303 1304 |
} static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci, struct the_nilfs *nilfs, int nadd) { |
e29df395b
|
1305 |
struct nilfs_segment_buffer *segbuf, *prev; |
9ff05123e
|
1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 |
struct inode *sufile = nilfs->ns_sufile; __u64 nextnextnum; LIST_HEAD(list); int err, ret, i; prev = NILFS_LAST_SEGBUF(&sci->sc_segbufs); /* * Since the segment specified with nextnum might be allocated during * the previous construction, the buffer including its segusage may * not be dirty. The following call ensures that the buffer is dirty * and will pin the buffer on memory until the sufile is written. */ |
61a189e9c
|
1318 |
err = nilfs_sufile_mark_dirty(sufile, prev->sb_nextnum); |
9ff05123e
|
1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 |
if (unlikely(err)) return err; for (i = 0; i < nadd; i++) { /* extend segment info */ err = -ENOMEM; segbuf = nilfs_segbuf_new(sci->sc_super); if (unlikely(!segbuf)) goto failed; /* map this buffer to region of segment on-disk */ |
cece55207
|
1330 |
nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs); |
9ff05123e
|
1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 |
sci->sc_segbuf_nblocks += segbuf->sb_rest_blocks; /* allocate the next next full segment */ err = nilfs_sufile_alloc(sufile, &nextnextnum); if (unlikely(err)) goto failed_segbuf; segbuf->sb_sum.seg_seq = prev->sb_sum.seg_seq + 1; nilfs_segbuf_set_next_segnum(segbuf, nextnextnum, nilfs); list_add_tail(&segbuf->sb_list, &list); prev = segbuf; } |
0935db747
|
1344 |
list_splice_tail(&list, &sci->sc_segbufs); |
9ff05123e
|
1345 1346 1347 1348 1349 |
return 0; failed_segbuf: nilfs_segbuf_free(segbuf); failed: |
e29df395b
|
1350 |
list_for_each_entry(segbuf, &list, sb_list) { |
9ff05123e
|
1351 |
ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); |
1f5abe7e7
|
1352 |
WARN_ON(ret); /* never fails */ |
9ff05123e
|
1353 |
} |
e29df395b
|
1354 |
nilfs_destroy_logs(&list); |
9ff05123e
|
1355 1356 |
return err; } |
a694291a6
|
1357 1358 |
static void nilfs_free_incomplete_logs(struct list_head *logs, struct the_nilfs *nilfs) |
9ff05123e
|
1359 |
{ |
a694291a6
|
1360 1361 |
struct nilfs_segment_buffer *segbuf, *prev; struct inode *sufile = nilfs->ns_sufile; |
9284ad2a9
|
1362 |
int ret; |
9ff05123e
|
1363 |
|
a694291a6
|
1364 |
segbuf = NILFS_FIRST_SEGBUF(logs); |
9ff05123e
|
1365 |
if (nilfs->ns_nextnum != segbuf->sb_nextnum) { |
a694291a6
|
1366 |
ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); |
1f5abe7e7
|
1367 |
WARN_ON(ret); /* never fails */ |
9ff05123e
|
1368 |
} |
9284ad2a9
|
1369 |
if (atomic_read(&segbuf->sb_err)) { |
9ff05123e
|
1370 1371 |
/* Case 1: The first segment failed */ if (segbuf->sb_pseg_start != segbuf->sb_fseg_start) |
076a378ba
|
1372 1373 1374 1375 |
/* * Case 1a: Partial segment appended into an existing * segment */ |
9ff05123e
|
1376 1377 1378 1379 |
nilfs_terminate_segment(nilfs, segbuf->sb_fseg_start, segbuf->sb_fseg_end); else /* Case 1b: New full segment */ set_nilfs_discontinued(nilfs); |
9ff05123e
|
1380 |
} |
a694291a6
|
1381 1382 1383 1384 1385 1386 |
prev = segbuf; list_for_each_entry_continue(segbuf, logs, sb_list) { if (prev->sb_nextnum != segbuf->sb_nextnum) { ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); WARN_ON(ret); /* never fails */ } |
9284ad2a9
|
1387 1388 1389 |
if (atomic_read(&segbuf->sb_err) && segbuf->sb_segnum != nilfs->ns_nextnum) /* Case 2: extended segment (!= next) failed */ |
a694291a6
|
1390 1391 |
nilfs_sufile_set_error(sufile, segbuf->sb_segnum); prev = segbuf; |
9ff05123e
|
1392 |
} |
9ff05123e
|
1393 1394 1395 1396 1397 1398 |
} static void nilfs_segctor_update_segusage(struct nilfs_sc_info *sci, struct inode *sufile) { struct nilfs_segment_buffer *segbuf; |
9ff05123e
|
1399 1400 1401 1402 |
unsigned long live_blocks; int ret; list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) { |
9ff05123e
|
1403 1404 |
live_blocks = segbuf->sb_sum.nblocks + (segbuf->sb_pseg_start - segbuf->sb_fseg_start); |
071ec54dd
|
1405 1406 1407 1408 |
ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum, live_blocks, sci->sc_seg_ctime); WARN_ON(ret); /* always succeed because the segusage is dirty */ |
9ff05123e
|
1409 1410 |
} } |
a694291a6
|
1411 |
static void nilfs_cancel_segusage(struct list_head *logs, struct inode *sufile) |
9ff05123e
|
1412 1413 |
{ struct nilfs_segment_buffer *segbuf; |
9ff05123e
|
1414 |
int ret; |
a694291a6
|
1415 |
segbuf = NILFS_FIRST_SEGBUF(logs); |
071ec54dd
|
1416 1417 1418 1419 |
ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum, segbuf->sb_pseg_start - segbuf->sb_fseg_start, 0); WARN_ON(ret); /* always succeed because the segusage is dirty */ |
9ff05123e
|
1420 |
|
a694291a6
|
1421 |
list_for_each_entry_continue(segbuf, logs, sb_list) { |
071ec54dd
|
1422 1423 |
ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum, 0, 0); |
1f5abe7e7
|
1424 |
WARN_ON(ret); /* always succeed */ |
9ff05123e
|
1425 1426 1427 1428 1429 1430 1431 |
} } static void nilfs_segctor_truncate_segments(struct nilfs_sc_info *sci, struct nilfs_segment_buffer *last, struct inode *sufile) { |
e29df395b
|
1432 |
struct nilfs_segment_buffer *segbuf = last; |
9ff05123e
|
1433 |
int ret; |
e29df395b
|
1434 |
list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) { |
9ff05123e
|
1435 1436 |
sci->sc_segbuf_nblocks -= segbuf->sb_rest_blocks; ret = nilfs_sufile_free(sufile, segbuf->sb_nextnum); |
1f5abe7e7
|
1437 |
WARN_ON(ret); |
9ff05123e
|
1438 |
} |
e29df395b
|
1439 |
nilfs_truncate_logs(&sci->sc_segbufs, last); |
9ff05123e
|
1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 |
} static int nilfs_segctor_collect(struct nilfs_sc_info *sci, struct the_nilfs *nilfs, int mode) { struct nilfs_cstage prev_stage = sci->sc_stage; int err, nadd = 1; /* Collection retry loop */ for (;;) { |
9ff05123e
|
1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 |
sci->sc_nblk_this_inc = 0; sci->sc_curseg = NILFS_FIRST_SEGBUF(&sci->sc_segbufs); err = nilfs_segctor_reset_segment_buffer(sci); if (unlikely(err)) goto failed; err = nilfs_segctor_collect_blocks(sci, mode); sci->sc_nblk_this_inc += sci->sc_curseg->sb_sum.nblocks; if (!err) break; if (unlikely(err != -E2BIG)) goto failed; /* The current segment is filled up */ |
584977038
|
1467 1468 |
if (mode != SC_LSEG_SR || nilfs_sc_cstage_get(sci) < NILFS_ST_CPFILE) |
9ff05123e
|
1469 |
break; |
2d8428aca
|
1470 |
nilfs_clear_logs(&sci->sc_segbufs); |
071cb4b81
|
1471 1472 1473 1474 1475 1476 |
if (sci->sc_stage.flags & NILFS_CF_SUFREED) { err = nilfs_sufile_cancel_freev(nilfs->ns_sufile, sci->sc_freesegs, sci->sc_nfreesegs, NULL); WARN_ON(err); /* do not happen */ |
70f2fe3a2
|
1477 |
sci->sc_stage.flags &= ~NILFS_CF_SUFREED; |
071cb4b81
|
1478 |
} |
70f2fe3a2
|
1479 1480 1481 1482 |
err = nilfs_segctor_extend_segments(sci, nilfs, nadd); if (unlikely(err)) return err; |
9ff05123e
|
1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 |
nadd = min_t(int, nadd << 1, SC_MAX_SEGDELTA); sci->sc_stage = prev_stage; } nilfs_segctor_truncate_segments(sci, sci->sc_curseg, nilfs->ns_sufile); return 0; failed: return err; } static void nilfs_list_replace_buffer(struct buffer_head *old_bh, struct buffer_head *new_bh) { BUG_ON(!list_empty(&new_bh->b_assoc_buffers)); list_replace_init(&old_bh->b_assoc_buffers, &new_bh->b_assoc_buffers); /* The caller must release old_bh */ } static int nilfs_segctor_update_payload_blocknr(struct nilfs_sc_info *sci, struct nilfs_segment_buffer *segbuf, int mode) { struct inode *inode = NULL; sector_t blocknr; unsigned long nfinfo = segbuf->sb_sum.nfinfo; unsigned long nblocks = 0, ndatablk = 0; |
1c613cb98
|
1511 |
const struct nilfs_sc_operations *sc_op = NULL; |
9ff05123e
|
1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 |
struct nilfs_segsum_pointer ssp; struct nilfs_finfo *finfo = NULL; union nilfs_binfo binfo; struct buffer_head *bh, *bh_org; ino_t ino = 0; int err = 0; if (!nfinfo) goto out; blocknr = segbuf->sb_pseg_start + segbuf->sb_sum.nsumblk; ssp.bh = NILFS_SEGBUF_FIRST_BH(&segbuf->sb_segsum_buffers); ssp.offset = sizeof(struct nilfs_segment_summary); list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) { |
1e2b68bf2
|
1527 |
if (bh == segbuf->sb_super_root) |
9ff05123e
|
1528 1529 1530 1531 1532 1533 1534 |
break; if (!finfo) { finfo = nilfs_segctor_map_segsum_entry( sci, &ssp, sizeof(*finfo)); ino = le64_to_cpu(finfo->fi_ino); nblocks = le32_to_cpu(finfo->fi_nblocks); ndatablk = le32_to_cpu(finfo->fi_ndatablk); |
aa405b1f4
|
1535 |
inode = bh->b_page->mapping->host; |
9ff05123e
|
1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 |
if (mode == SC_LSEG_DSYNC) sc_op = &nilfs_sc_dsync_ops; else if (ino == NILFS_DAT_INO) sc_op = &nilfs_sc_dat_ops; else /* file blocks */ sc_op = &nilfs_sc_file_ops; } bh_org = bh; get_bh(bh_org); err = nilfs_bmap_assign(NILFS_I(inode)->i_bmap, &bh, blocknr, &binfo); if (bh != bh_org) nilfs_list_replace_buffer(bh_org, bh); brelse(bh_org); if (unlikely(err)) goto failed_bmap; if (ndatablk > 0) sc_op->write_data_binfo(sci, &ssp, &binfo); else sc_op->write_node_binfo(sci, &ssp, &binfo); blocknr++; if (--nblocks == 0) { finfo = NULL; if (--nfinfo == 0) break; } else if (ndatablk > 0) ndatablk--; } out: return 0; failed_bmap: |
9ff05123e
|
1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 |
return err; } static int nilfs_segctor_assign(struct nilfs_sc_info *sci, int mode) { struct nilfs_segment_buffer *segbuf; int err; list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) { err = nilfs_segctor_update_payload_blocknr(sci, segbuf, mode); if (unlikely(err)) return err; nilfs_segbuf_fill_in_segsum(segbuf); } return 0; } |
1cb2d38cb
|
1587 |
static void nilfs_begin_page_io(struct page *page) |
9ff05123e
|
1588 1589 |
{ if (!page || PageWriteback(page)) |
076a378ba
|
1590 1591 1592 1593 |
/* * For split b-tree node pages, this function may be called * twice. We ignore the 2nd or later calls by this check. */ |
1cb2d38cb
|
1594 |
return; |
9ff05123e
|
1595 1596 1597 1598 1599 |
lock_page(page); clear_page_dirty_for_io(page); set_page_writeback(page); unlock_page(page); |
9ff05123e
|
1600 |
} |
1cb2d38cb
|
1601 |
static void nilfs_segctor_prepare_write(struct nilfs_sc_info *sci) |
9ff05123e
|
1602 1603 1604 |
{ struct nilfs_segment_buffer *segbuf; struct page *bd_page = NULL, *fs_page = NULL; |
9ff05123e
|
1605 |
|
9ff05123e
|
1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 |
list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) { struct buffer_head *bh; list_for_each_entry(bh, &segbuf->sb_segsum_buffers, b_assoc_buffers) { if (bh->b_page != bd_page) { if (bd_page) { lock_page(bd_page); clear_page_dirty_for_io(bd_page); set_page_writeback(bd_page); unlock_page(bd_page); } bd_page = bh->b_page; } } list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) { |
7f42ec394
|
1624 |
set_buffer_async_write(bh); |
1e2b68bf2
|
1625 |
if (bh == segbuf->sb_super_root) { |
9ff05123e
|
1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 |
if (bh->b_page != bd_page) { lock_page(bd_page); clear_page_dirty_for_io(bd_page); set_page_writeback(bd_page); unlock_page(bd_page); bd_page = bh->b_page; } break; } if (bh->b_page != fs_page) { |
1cb2d38cb
|
1636 |
nilfs_begin_page_io(fs_page); |
9ff05123e
|
1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 |
fs_page = bh->b_page; } } } if (bd_page) { lock_page(bd_page); clear_page_dirty_for_io(bd_page); set_page_writeback(bd_page); unlock_page(bd_page); } |
1cb2d38cb
|
1647 |
nilfs_begin_page_io(fs_page); |
9ff05123e
|
1648 1649 1650 |
} static int nilfs_segctor_write(struct nilfs_sc_info *sci, |
9c965bac1
|
1651 |
struct the_nilfs *nilfs) |
9ff05123e
|
1652 |
{ |
d1c6b72a7
|
1653 |
int ret; |
9ff05123e
|
1654 |
|
d1c6b72a7
|
1655 |
ret = nilfs_write_logs(&sci->sc_segbufs, nilfs); |
a694291a6
|
1656 1657 |
list_splice_tail_init(&sci->sc_segbufs, &sci->sc_write_logs); return ret; |
9ff05123e
|
1658 |
} |
9ff05123e
|
1659 1660 1661 1662 |
static void nilfs_end_page_io(struct page *page, int err) { if (!page) return; |
a97778457
|
1663 |
if (buffer_nilfs_node(page_buffers(page)) && !PageWriteback(page)) { |
8227b2972
|
1664 1665 1666 1667 |
/* * For b-tree node pages, this function may be called twice * or more because they might be split in a segment. */ |
a97778457
|
1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 |
if (PageDirty(page)) { /* * For pages holding split b-tree node buffers, dirty * flag on the buffers may be cleared discretely. * In that case, the page is once redirtied for * remaining buffers, and it must be cancelled if * all the buffers get cleaned later. */ lock_page(page); if (nilfs_page_buffers_clean(page)) __nilfs_clear_page_dirty(page); unlock_page(page); } |
9ff05123e
|
1681 |
return; |
a97778457
|
1682 |
} |
9ff05123e
|
1683 |
|
1cb2d38cb
|
1684 1685 1686 1687 1688 1689 1690 |
if (!err) { if (!nilfs_page_buffers_clean(page)) __set_page_dirty_nobuffers(page); ClearPageError(page); } else { __set_page_dirty_nobuffers(page); SetPageError(page); |
9ff05123e
|
1691 |
} |
1cb2d38cb
|
1692 1693 |
end_page_writeback(page); |
9ff05123e
|
1694 |
} |
1cb2d38cb
|
1695 |
static void nilfs_abort_logs(struct list_head *logs, int err) |
9ff05123e
|
1696 1697 1698 |
{ struct nilfs_segment_buffer *segbuf; struct page *bd_page = NULL, *fs_page = NULL; |
a694291a6
|
1699 |
struct buffer_head *bh; |
9ff05123e
|
1700 |
|
a694291a6
|
1701 1702 |
if (list_empty(logs)) return; |
9ff05123e
|
1703 |
|
a694291a6
|
1704 |
list_for_each_entry(segbuf, logs, sb_list) { |
9ff05123e
|
1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 |
list_for_each_entry(bh, &segbuf->sb_segsum_buffers, b_assoc_buffers) { if (bh->b_page != bd_page) { if (bd_page) end_page_writeback(bd_page); bd_page = bh->b_page; } } list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) { |
7f42ec394
|
1716 |
clear_buffer_async_write(bh); |
1e2b68bf2
|
1717 |
if (bh == segbuf->sb_super_root) { |
9ff05123e
|
1718 1719 1720 1721 1722 1723 1724 1725 |
if (bh->b_page != bd_page) { end_page_writeback(bd_page); bd_page = bh->b_page; } break; } if (bh->b_page != fs_page) { nilfs_end_page_io(fs_page, err); |
9ff05123e
|
1726 1727 1728 1729 1730 1731 1732 1733 |
fs_page = bh->b_page; } } } if (bd_page) end_page_writeback(bd_page); nilfs_end_page_io(fs_page, err); |
a694291a6
|
1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 |
} static void nilfs_segctor_abort_construction(struct nilfs_sc_info *sci, struct the_nilfs *nilfs, int err) { LIST_HEAD(logs); int ret; list_splice_tail_init(&sci->sc_write_logs, &logs); ret = nilfs_wait_on_logs(&logs); |
1cb2d38cb
|
1744 |
nilfs_abort_logs(&logs, ret ? : err); |
a694291a6
|
1745 1746 1747 1748 |
list_splice_tail_init(&sci->sc_segbufs, &logs); nilfs_cancel_segusage(&logs, nilfs->ns_sufile); nilfs_free_incomplete_logs(&logs, nilfs); |
a694291a6
|
1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 |
if (sci->sc_stage.flags & NILFS_CF_SUFREED) { ret = nilfs_sufile_cancel_freev(nilfs->ns_sufile, sci->sc_freesegs, sci->sc_nfreesegs, NULL); WARN_ON(ret); /* do not happen */ } nilfs_destroy_logs(&logs); |
9ff05123e
|
1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 |
} static void nilfs_set_next_segment(struct the_nilfs *nilfs, struct nilfs_segment_buffer *segbuf) { nilfs->ns_segnum = segbuf->sb_segnum; nilfs->ns_nextnum = segbuf->sb_nextnum; nilfs->ns_pseg_offset = segbuf->sb_pseg_start - segbuf->sb_fseg_start + segbuf->sb_sum.nblocks; nilfs->ns_seg_seq = segbuf->sb_sum.seg_seq; nilfs->ns_ctime = segbuf->sb_sum.ctime; } static void nilfs_segctor_complete_write(struct nilfs_sc_info *sci) { struct nilfs_segment_buffer *segbuf; struct page *bd_page = NULL, *fs_page = NULL; |
e3154e974
|
1776 |
struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
1e2b68bf2
|
1777 |
int update_sr = false; |
9ff05123e
|
1778 |
|
a694291a6
|
1779 |
list_for_each_entry(segbuf, &sci->sc_write_logs, sb_list) { |
9ff05123e
|
1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 |
struct buffer_head *bh; list_for_each_entry(bh, &segbuf->sb_segsum_buffers, b_assoc_buffers) { set_buffer_uptodate(bh); clear_buffer_dirty(bh); if (bh->b_page != bd_page) { if (bd_page) end_page_writeback(bd_page); bd_page = bh->b_page; } } /* * We assume that the buffers which belong to the same page * continue over the buffer list. * Under this assumption, the last BHs of pages is * identifiable by the discontinuity of bh->b_page * (page != fs_page). * * For B-tree node blocks, however, this assumption is not * guaranteed. The cleanup code of B-tree node pages needs * special care. */ list_for_each_entry(bh, &segbuf->sb_payload_buffers, b_assoc_buffers) { |
4ce5c3426
|
1805 |
const unsigned long set_bits = BIT(BH_Uptodate); |
ead8ecffa
|
1806 |
const unsigned long clear_bits = |
4ce5c3426
|
1807 1808 1809 |
(BIT(BH_Dirty) | BIT(BH_Async_Write) | BIT(BH_Delay) | BIT(BH_NILFS_Volatile) | BIT(BH_NILFS_Redirected)); |
ead8ecffa
|
1810 1811 |
set_mask_bits(&bh->b_state, clear_bits, set_bits); |
1e2b68bf2
|
1812 |
if (bh == segbuf->sb_super_root) { |
9ff05123e
|
1813 1814 1815 1816 |
if (bh->b_page != bd_page) { end_page_writeback(bd_page); bd_page = bh->b_page; } |
1e2b68bf2
|
1817 |
update_sr = true; |
9ff05123e
|
1818 1819 1820 1821 1822 1823 1824 |
break; } if (bh->b_page != fs_page) { nilfs_end_page_io(fs_page, 0); fs_page = bh->b_page; } } |
4762077c7
|
1825 1826 |
if (!nilfs_segbuf_simplex(segbuf)) { if (segbuf->sb_sum.flags & NILFS_SS_LOGBGN) { |
9ff05123e
|
1827 1828 1829 |
set_bit(NILFS_SC_UNCLOSED, &sci->sc_flags); sci->sc_lseg_stime = jiffies; } |
4762077c7
|
1830 |
if (segbuf->sb_sum.flags & NILFS_SS_LOGEND) |
9ff05123e
|
1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 |
clear_bit(NILFS_SC_UNCLOSED, &sci->sc_flags); } } /* * Since pages may continue over multiple segment buffers, * end of the last page must be checked outside of the loop. */ if (bd_page) end_page_writeback(bd_page); nilfs_end_page_io(fs_page, 0); |
9ff05123e
|
1842 |
nilfs_drop_collected_inodes(&sci->sc_dirty_files); |
c1c1d7092
|
1843 |
if (nilfs_doing_gc()) |
9ff05123e
|
1844 |
nilfs_drop_collected_inodes(&sci->sc_gc_inodes); |
c1c1d7092
|
1845 |
else |
9ff05123e
|
1846 |
nilfs->ns_nongc_ctime = sci->sc_seg_ctime; |
9ff05123e
|
1847 1848 |
sci->sc_nblk_inc += sci->sc_nblk_this_inc; |
a694291a6
|
1849 |
segbuf = NILFS_LAST_SEGBUF(&sci->sc_write_logs); |
9ff05123e
|
1850 1851 1852 |
nilfs_set_next_segment(nilfs, segbuf); if (update_sr) { |
e2c7617ae
|
1853 |
nilfs->ns_flushed_device = 0; |
9ff05123e
|
1854 |
nilfs_set_last_segment(nilfs, segbuf->sb_pseg_start, |
e339ad31f
|
1855 |
segbuf->sb_sum.seg_seq, nilfs->ns_cno++); |
9ff05123e
|
1856 |
|
c96fa464a
|
1857 |
clear_bit(NILFS_SC_HAVE_DELTA, &sci->sc_flags); |
9ff05123e
|
1858 1859 |
clear_bit(NILFS_SC_DIRTY, &sci->sc_flags); set_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags); |
a694291a6
|
1860 |
nilfs_segctor_clear_metadata_dirty(sci); |
9ff05123e
|
1861 1862 1863 |
} else clear_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags); } |
a694291a6
|
1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 |
static int nilfs_segctor_wait(struct nilfs_sc_info *sci) { int ret; ret = nilfs_wait_on_logs(&sci->sc_write_logs); if (!ret) { nilfs_segctor_complete_write(sci); nilfs_destroy_logs(&sci->sc_write_logs); } return ret; } |
693dd3212
|
1875 1876 |
static int nilfs_segctor_collect_dirty_files(struct nilfs_sc_info *sci, struct the_nilfs *nilfs) |
9ff05123e
|
1877 1878 |
{ struct nilfs_inode_info *ii, *n; |
e912a5b66
|
1879 |
struct inode *ifile = sci->sc_root->ifile; |
9ff05123e
|
1880 |
|
693dd3212
|
1881 |
spin_lock(&nilfs->ns_inode_lock); |
9ff05123e
|
1882 |
retry: |
693dd3212
|
1883 |
list_for_each_entry_safe(ii, n, &nilfs->ns_dirty_files, i_dirty) { |
9ff05123e
|
1884 1885 1886 |
if (!ii->i_bh) { struct buffer_head *ibh; int err; |
693dd3212
|
1887 |
spin_unlock(&nilfs->ns_inode_lock); |
9ff05123e
|
1888 |
err = nilfs_ifile_get_inode_block( |
e912a5b66
|
1889 |
ifile, ii->vfs_inode.i_ino, &ibh); |
9ff05123e
|
1890 |
if (unlikely(err)) { |
d6517deb0
|
1891 1892 1893 |
nilfs_msg(sci->sc_super, KERN_WARNING, "log writer: error %d getting inode block (ino=%lu)", err, ii->vfs_inode.i_ino); |
9ff05123e
|
1894 1895 |
return err; } |
693dd3212
|
1896 |
spin_lock(&nilfs->ns_inode_lock); |
9ff05123e
|
1897 1898 1899 1900 1901 1902 |
if (likely(!ii->i_bh)) ii->i_bh = ibh; else brelse(ibh); goto retry; } |
9ff05123e
|
1903 |
|
f94782668
|
1904 1905 1906 |
// Always redirty the buffer to avoid race condition mark_buffer_dirty(ii->i_bh); nilfs_mdt_mark_dirty(ifile); |
9ff05123e
|
1907 1908 |
clear_bit(NILFS_I_QUEUED, &ii->i_state); set_bit(NILFS_I_BUSY, &ii->i_state); |
eaae0f37d
|
1909 |
list_move_tail(&ii->i_dirty, &sci->sc_dirty_files); |
9ff05123e
|
1910 |
} |
693dd3212
|
1911 |
spin_unlock(&nilfs->ns_inode_lock); |
9ff05123e
|
1912 |
|
9ff05123e
|
1913 1914 |
return 0; } |
693dd3212
|
1915 1916 |
static void nilfs_segctor_drop_written_files(struct nilfs_sc_info *sci, struct the_nilfs *nilfs) |
9ff05123e
|
1917 |
{ |
9ff05123e
|
1918 |
struct nilfs_inode_info *ii, *n; |
283ee1482
|
1919 |
int during_mount = !(sci->sc_super->s_flags & MS_ACTIVE); |
7ef3ff2fe
|
1920 |
int defer_iput = false; |
9ff05123e
|
1921 |
|
693dd3212
|
1922 |
spin_lock(&nilfs->ns_inode_lock); |
9ff05123e
|
1923 1924 |
list_for_each_entry_safe(ii, n, &sci->sc_dirty_files, i_dirty) { if (!test_and_clear_bit(NILFS_I_UPDATED, &ii->i_state) || |
6c43f4100
|
1925 |
test_bit(NILFS_I_DIRTY, &ii->i_state)) |
9ff05123e
|
1926 |
continue; |
6c43f4100
|
1927 |
|
9ff05123e
|
1928 1929 1930 |
clear_bit(NILFS_I_BUSY, &ii->i_state); brelse(ii->i_bh); ii->i_bh = NULL; |
7ef3ff2fe
|
1931 |
list_del_init(&ii->i_dirty); |
283ee1482
|
1932 |
if (!ii->vfs_inode.i_nlink || during_mount) { |
7ef3ff2fe
|
1933 |
/* |
283ee1482
|
1934 1935 |
* Defer calling iput() to avoid deadlocks if * i_nlink == 0 or mount is not yet finished. |
7ef3ff2fe
|
1936 1937 1938 1939 1940 1941 1942 1943 |
*/ list_add_tail(&ii->i_dirty, &sci->sc_iput_queue); defer_iput = true; } else { spin_unlock(&nilfs->ns_inode_lock); iput(&ii->vfs_inode); spin_lock(&nilfs->ns_inode_lock); } |
9ff05123e
|
1944 |
} |
693dd3212
|
1945 |
spin_unlock(&nilfs->ns_inode_lock); |
7ef3ff2fe
|
1946 1947 1948 |
if (defer_iput) schedule_work(&sci->sc_iput_work); |
9ff05123e
|
1949 1950 1951 |
} /* |
9ff05123e
|
1952 1953 1954 1955 |
* Main procedure of segment constructor */ static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode) { |
e3154e974
|
1956 |
struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
1e2b68bf2
|
1957 |
int err; |
9ff05123e
|
1958 |
|
584977038
|
1959 |
nilfs_sc_cstage_set(sci, NILFS_ST_INIT); |
6c43f4100
|
1960 |
sci->sc_cno = nilfs->ns_cno; |
9ff05123e
|
1961 |
|
693dd3212
|
1962 |
err = nilfs_segctor_collect_dirty_files(sci, nilfs); |
9ff05123e
|
1963 1964 |
if (unlikely(err)) goto out; |
e912a5b66
|
1965 |
if (nilfs_test_metadata_dirty(nilfs, sci->sc_root)) |
9ff05123e
|
1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 |
set_bit(NILFS_SC_DIRTY, &sci->sc_flags); if (nilfs_segctor_clean(sci)) goto out; do { sci->sc_stage.flags &= ~NILFS_CF_HISTORY_MASK; err = nilfs_segctor_begin_construction(sci, nilfs); if (unlikely(err)) goto out; /* Update time stamp */ sci->sc_seg_ctime = get_seconds(); err = nilfs_segctor_collect(sci, nilfs, mode); if (unlikely(err)) goto failed; |
9ff05123e
|
1984 |
/* Avoid empty segment */ |
584977038
|
1985 |
if (nilfs_sc_cstage_get(sci) == NILFS_ST_DONE && |
4762077c7
|
1986 |
nilfs_segbuf_empty(sci->sc_curseg)) { |
a694291a6
|
1987 |
nilfs_segctor_abort_construction(sci, nilfs, 1); |
9ff05123e
|
1988 1989 1990 1991 1992 1993 |
goto out; } err = nilfs_segctor_assign(sci, mode); if (unlikely(err)) goto failed; |
9ff05123e
|
1994 |
if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED) |
e912a5b66
|
1995 |
nilfs_segctor_fill_in_file_bmap(sci); |
9ff05123e
|
1996 |
|
1e2b68bf2
|
1997 |
if (mode == SC_LSEG_SR && |
584977038
|
1998 |
nilfs_sc_cstage_get(sci) >= NILFS_ST_CPFILE) { |
9ff05123e
|
1999 2000 |
err = nilfs_segctor_fill_in_checkpoint(sci); if (unlikely(err)) |
a694291a6
|
2001 |
goto failed_to_write; |
9ff05123e
|
2002 2003 2004 2005 2006 2007 |
nilfs_segctor_fill_in_super_root(sci, nilfs); } nilfs_segctor_update_segusage(sci, nilfs->ns_sufile); /* Write partial segments */ |
1cb2d38cb
|
2008 |
nilfs_segctor_prepare_write(sci); |
aaed1d5bf
|
2009 2010 2011 |
nilfs_add_checksums_on_logs(&sci->sc_segbufs, nilfs->ns_crc_seed); |
9ff05123e
|
2012 |
|
9c965bac1
|
2013 |
err = nilfs_segctor_write(sci, nilfs); |
9ff05123e
|
2014 2015 |
if (unlikely(err)) goto failed_to_write; |
584977038
|
2016 |
if (nilfs_sc_cstage_get(sci) == NILFS_ST_DONE || |
09cbfeaf1
|
2017 |
nilfs->ns_blocksize_bits != PAGE_SHIFT) { |
a694291a6
|
2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 |
/* * At this point, we avoid double buffering * for blocksize < pagesize because page dirty * flag is turned off during write and dirty * buffers are not properly collected for * pages crossing over segments. */ err = nilfs_segctor_wait(sci); if (err) goto failed_to_write; } |
584977038
|
2029 |
} while (nilfs_sc_cstage_get(sci) != NILFS_ST_DONE); |
9ff05123e
|
2030 |
|
9ff05123e
|
2031 |
out: |
693dd3212
|
2032 |
nilfs_segctor_drop_written_files(sci, nilfs); |
9ff05123e
|
2033 2034 2035 |
return err; failed_to_write: |
9ff05123e
|
2036 2037 |
if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED) nilfs_redirty_inodes(&sci->sc_dirty_files); |
9ff05123e
|
2038 2039 2040 2041 |
failed: if (nilfs_doing_gc()) nilfs_redirty_inodes(&sci->sc_gc_inodes); |
a694291a6
|
2042 |
nilfs_segctor_abort_construction(sci, nilfs, err); |
9ff05123e
|
2043 2044 2045 2046 |
goto out; } /** |
9ccf56c13
|
2047 |
* nilfs_segctor_start_timer - set timer of background write |
9ff05123e
|
2048 2049 2050 2051 2052 2053 2054 2055 2056 |
* @sci: nilfs_sc_info * * If the timer has already been set, it ignores the new request. * This function MUST be called within a section locking the segment * semaphore. */ static void nilfs_segctor_start_timer(struct nilfs_sc_info *sci) { spin_lock(&sci->sc_state_lock); |
fdce895ea
|
2057 2058 2059 |
if (!(sci->sc_state & NILFS_SEGCTOR_COMMIT)) { sci->sc_timer.expires = jiffies + sci->sc_interval; add_timer(&sci->sc_timer); |
9ff05123e
|
2060 2061 2062 2063 2064 2065 2066 2067 |
sci->sc_state |= NILFS_SEGCTOR_COMMIT; } spin_unlock(&sci->sc_state_lock); } static void nilfs_segctor_do_flush(struct nilfs_sc_info *sci, int bn) { spin_lock(&sci->sc_state_lock); |
4ce5c3426
|
2068 |
if (!(sci->sc_flush_request & BIT(bn))) { |
9ff05123e
|
2069 |
unsigned long prev_req = sci->sc_flush_request; |
4ce5c3426
|
2070 |
sci->sc_flush_request |= BIT(bn); |
9ff05123e
|
2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 |
if (!prev_req) wake_up(&sci->sc_wait_daemon); } spin_unlock(&sci->sc_state_lock); } /** * nilfs_flush_segment - trigger a segment construction for resource control * @sb: super block * @ino: inode number of the file to be flushed out. */ void nilfs_flush_segment(struct super_block *sb, ino_t ino) { |
e3154e974
|
2084 |
struct the_nilfs *nilfs = sb->s_fs_info; |
3fd3fe5ae
|
2085 |
struct nilfs_sc_info *sci = nilfs->ns_writer; |
9ff05123e
|
2086 2087 2088 2089 2090 2091 |
if (!sci || nilfs_doing_construction()) return; nilfs_segctor_do_flush(sci, NILFS_MDT_INODE(sb, ino) ? ino : 0); /* assign bit 0 to data files */ } |
9ff05123e
|
2092 |
struct nilfs_segctor_wait_request { |
ac6424b98
|
2093 |
wait_queue_entry_t wq; |
9ff05123e
|
2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 |
__u32 seq; int err; atomic_t done; }; static int nilfs_segctor_sync(struct nilfs_sc_info *sci) { struct nilfs_segctor_wait_request wait_req; int err = 0; spin_lock(&sci->sc_state_lock); init_wait(&wait_req.wq); wait_req.err = 0; atomic_set(&wait_req.done, 0); wait_req.seq = ++sci->sc_seq_request; spin_unlock(&sci->sc_state_lock); init_waitqueue_entry(&wait_req.wq, current); add_wait_queue(&sci->sc_wait_request, &wait_req.wq); set_current_state(TASK_INTERRUPTIBLE); wake_up(&sci->sc_wait_daemon); for (;;) { if (atomic_read(&wait_req.done)) { err = wait_req.err; break; } if (!signal_pending(current)) { schedule(); continue; } err = -ERESTARTSYS; break; } finish_wait(&sci->sc_wait_request, &wait_req.wq); return err; } static void nilfs_segctor_wakeup(struct nilfs_sc_info *sci, int err) { struct nilfs_segctor_wait_request *wrq, *n; unsigned long flags; spin_lock_irqsave(&sci->sc_wait_request.lock, flags); |
2055da973
|
2138 |
list_for_each_entry_safe(wrq, n, &sci->sc_wait_request.head, wq.entry) { |
9ff05123e
|
2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 |
if (!atomic_read(&wrq->done) && nilfs_cnt32_ge(sci->sc_seq_done, wrq->seq)) { wrq->err = err; atomic_set(&wrq->done, 1); } if (atomic_read(&wrq->done)) { wrq->wq.func(&wrq->wq, TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 0, NULL); } } spin_unlock_irqrestore(&sci->sc_wait_request.lock, flags); } /** * nilfs_construct_segment - construct a logical segment * @sb: super block * * Return Value: On success, 0 is retured. On errors, one of the following * negative error code is returned. * * %-EROFS - Read only filesystem. * * %-EIO - I/O error * * %-ENOSPC - No space left on device (only in a panic state). * * %-ERESTARTSYS - Interrupted. * * %-ENOMEM - Insufficient memory available. */ int nilfs_construct_segment(struct super_block *sb) { |
e3154e974
|
2172 |
struct the_nilfs *nilfs = sb->s_fs_info; |
3fd3fe5ae
|
2173 |
struct nilfs_sc_info *sci = nilfs->ns_writer; |
9ff05123e
|
2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 |
struct nilfs_transaction_info *ti; int err; if (!sci) return -EROFS; /* A call inside transactions causes a deadlock. */ BUG_ON((ti = current->journal_info) && ti->ti_magic == NILFS_TI_MAGIC); err = nilfs_segctor_sync(sci); return err; } /** * nilfs_construct_dsync_segment - construct a data-only logical segment * @sb: super block |
f30bf3e40
|
2190 2191 2192 |
* @inode: inode whose data blocks should be written out * @start: start byte offset * @end: end byte offset (inclusive) |
9ff05123e
|
2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 |
* * Return Value: On success, 0 is retured. On errors, one of the following * negative error code is returned. * * %-EROFS - Read only filesystem. * * %-EIO - I/O error * * %-ENOSPC - No space left on device (only in a panic state). * * %-ERESTARTSYS - Interrupted. * * %-ENOMEM - Insufficient memory available. */ |
f30bf3e40
|
2207 2208 |
int nilfs_construct_dsync_segment(struct super_block *sb, struct inode *inode, loff_t start, loff_t end) |
9ff05123e
|
2209 |
{ |
e3154e974
|
2210 |
struct the_nilfs *nilfs = sb->s_fs_info; |
3fd3fe5ae
|
2211 |
struct nilfs_sc_info *sci = nilfs->ns_writer; |
9ff05123e
|
2212 2213 2214 2215 2216 2217 |
struct nilfs_inode_info *ii; struct nilfs_transaction_info ti; int err = 0; if (!sci) return -EROFS; |
f7545144c
|
2218 |
nilfs_transaction_lock(sb, &ti, 0); |
9ff05123e
|
2219 2220 |
ii = NILFS_I(inode); |
b9f661407
|
2221 |
if (test_bit(NILFS_I_INODE_SYNC, &ii->i_state) || |
3b2ce58b0
|
2222 |
nilfs_test_opt(nilfs, STRICT_ORDER) || |
9ff05123e
|
2223 |
test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) || |
3b2ce58b0
|
2224 |
nilfs_discontinued(nilfs)) { |
f7545144c
|
2225 |
nilfs_transaction_unlock(sb); |
9ff05123e
|
2226 2227 2228 |
err = nilfs_segctor_sync(sci); return err; } |
693dd3212
|
2229 |
spin_lock(&nilfs->ns_inode_lock); |
9ff05123e
|
2230 2231 |
if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && !test_bit(NILFS_I_BUSY, &ii->i_state)) { |
693dd3212
|
2232 |
spin_unlock(&nilfs->ns_inode_lock); |
f7545144c
|
2233 |
nilfs_transaction_unlock(sb); |
9ff05123e
|
2234 2235 |
return 0; } |
693dd3212
|
2236 |
spin_unlock(&nilfs->ns_inode_lock); |
f30bf3e40
|
2237 2238 2239 |
sci->sc_dsync_inode = ii; sci->sc_dsync_start = start; sci->sc_dsync_end = end; |
9ff05123e
|
2240 2241 |
err = nilfs_segctor_do_construct(sci, SC_LSEG_DSYNC); |
e2c7617ae
|
2242 2243 |
if (!err) nilfs->ns_flushed_device = 0; |
9ff05123e
|
2244 |
|
f7545144c
|
2245 |
nilfs_transaction_unlock(sb); |
9ff05123e
|
2246 2247 |
return err; } |
9ff05123e
|
2248 |
#define FLUSH_FILE_BIT (0x1) /* data file only */ |
4ce5c3426
|
2249 |
#define FLUSH_DAT_BIT BIT(NILFS_DAT_INO) /* DAT only */ |
9ff05123e
|
2250 |
|
dcd761869
|
2251 2252 2253 2254 2255 |
/** * nilfs_segctor_accept - record accepted sequence count of log-write requests * @sci: segment constructor object */ static void nilfs_segctor_accept(struct nilfs_sc_info *sci) |
9ff05123e
|
2256 |
{ |
9ff05123e
|
2257 |
spin_lock(&sci->sc_state_lock); |
dcd761869
|
2258 |
sci->sc_seq_accepted = sci->sc_seq_request; |
9ff05123e
|
2259 |
spin_unlock(&sci->sc_state_lock); |
fdce895ea
|
2260 |
del_timer_sync(&sci->sc_timer); |
9ff05123e
|
2261 |
} |
dcd761869
|
2262 2263 2264 2265 2266 2267 2268 |
/** * nilfs_segctor_notify - notify the result of request to caller threads * @sci: segment constructor object * @mode: mode of log forming * @err: error code to be notified */ static void nilfs_segctor_notify(struct nilfs_sc_info *sci, int mode, int err) |
9ff05123e
|
2269 2270 2271 |
{ /* Clear requests (even when the construction failed) */ spin_lock(&sci->sc_state_lock); |
dcd761869
|
2272 |
if (mode == SC_LSEG_SR) { |
aeda7f634
|
2273 |
sci->sc_state &= ~NILFS_SEGCTOR_COMMIT; |
dcd761869
|
2274 2275 |
sci->sc_seq_done = sci->sc_seq_accepted; nilfs_segctor_wakeup(sci, err); |
9ff05123e
|
2276 |
sci->sc_flush_request = 0; |
aeda7f634
|
2277 |
} else { |
dcd761869
|
2278 |
if (mode == SC_FLUSH_FILE) |
aeda7f634
|
2279 |
sci->sc_flush_request &= ~FLUSH_FILE_BIT; |
dcd761869
|
2280 |
else if (mode == SC_FLUSH_DAT) |
aeda7f634
|
2281 2282 2283 |
sci->sc_flush_request &= ~FLUSH_DAT_BIT; /* re-enable timer if checkpoint creation was not done */ |
fdce895ea
|
2284 2285 2286 |
if ((sci->sc_state & NILFS_SEGCTOR_COMMIT) && time_before(jiffies, sci->sc_timer.expires)) add_timer(&sci->sc_timer); |
aeda7f634
|
2287 |
} |
9ff05123e
|
2288 2289 |
spin_unlock(&sci->sc_state_lock); } |
dcd761869
|
2290 2291 2292 2293 2294 2295 |
/** * nilfs_segctor_construct - form logs and write them to disk * @sci: segment constructor object * @mode: mode of log forming */ static int nilfs_segctor_construct(struct nilfs_sc_info *sci, int mode) |
9ff05123e
|
2296 |
{ |
e3154e974
|
2297 |
struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
d26493b6f
|
2298 |
struct nilfs_super_block **sbp; |
9ff05123e
|
2299 |
int err = 0; |
dcd761869
|
2300 |
nilfs_segctor_accept(sci); |
9ff05123e
|
2301 |
if (nilfs_discontinued(nilfs)) |
dcd761869
|
2302 2303 2304 |
mode = SC_LSEG_SR; if (!nilfs_segctor_confirm(sci)) err = nilfs_segctor_do_construct(sci, mode); |
9ff05123e
|
2305 |
if (likely(!err)) { |
dcd761869
|
2306 |
if (mode != SC_FLUSH_DAT) |
9ff05123e
|
2307 2308 2309 2310 |
atomic_set(&nilfs->ns_ndirtyblks, 0); if (test_bit(NILFS_SC_SUPER_ROOT, &sci->sc_flags) && nilfs_discontinued(nilfs)) { down_write(&nilfs->ns_sem); |
d26493b6f
|
2311 |
err = -EIO; |
f7545144c
|
2312 |
sbp = nilfs_prepare_super(sci->sc_super, |
b2ac86e1a
|
2313 2314 2315 |
nilfs_sb_will_flip(nilfs)); if (likely(sbp)) { nilfs_set_log_cursor(sbp[0], nilfs); |
f7545144c
|
2316 2317 |
err = nilfs_commit_super(sci->sc_super, NILFS_SB_COMMIT); |
b2ac86e1a
|
2318 |
} |
9ff05123e
|
2319 2320 2321 |
up_write(&nilfs->ns_sem); } } |
dcd761869
|
2322 2323 |
nilfs_segctor_notify(sci, mode, err); |
9ff05123e
|
2324 2325 2326 2327 2328 2329 |
return err; } static void nilfs_construction_timeout(unsigned long data) { struct task_struct *p = (struct task_struct *)data; |
4ad364ca1
|
2330 |
|
9ff05123e
|
2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 |
wake_up_process(p); } static void nilfs_remove_written_gcinodes(struct the_nilfs *nilfs, struct list_head *head) { struct nilfs_inode_info *ii, *n; list_for_each_entry_safe(ii, n, head, i_dirty) { if (!test_bit(NILFS_I_UPDATED, &ii->i_state)) continue; |
9ff05123e
|
2342 |
list_del_init(&ii->i_dirty); |
fbb24a3a9
|
2343 2344 |
truncate_inode_pages(&ii->vfs_inode.i_data, 0); nilfs_btnode_cache_clear(&ii->i_btnode_cache); |
263d90cef
|
2345 |
iput(&ii->vfs_inode); |
9ff05123e
|
2346 2347 |
} } |
4f6b82883
|
2348 2349 |
int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv, void **kbufs) |
9ff05123e
|
2350 |
{ |
e3154e974
|
2351 |
struct the_nilfs *nilfs = sb->s_fs_info; |
3fd3fe5ae
|
2352 |
struct nilfs_sc_info *sci = nilfs->ns_writer; |
9ff05123e
|
2353 |
struct nilfs_transaction_info ti; |
9ff05123e
|
2354 2355 2356 2357 |
int err; if (unlikely(!sci)) return -EROFS; |
f7545144c
|
2358 |
nilfs_transaction_lock(sb, &ti, 1); |
9ff05123e
|
2359 |
|
c1c1d7092
|
2360 |
err = nilfs_mdt_save_to_shadow_map(nilfs->ns_dat); |
9ff05123e
|
2361 2362 |
if (unlikely(err)) goto out_unlock; |
071cb4b81
|
2363 |
|
4f6b82883
|
2364 |
err = nilfs_ioctl_prepare_clean_segments(nilfs, argv, kbufs); |
c1c1d7092
|
2365 2366 |
if (unlikely(err)) { nilfs_mdt_restore_from_shadow_map(nilfs->ns_dat); |
9ff05123e
|
2367 |
goto out_unlock; |
c1c1d7092
|
2368 |
} |
9ff05123e
|
2369 |
|
071cb4b81
|
2370 2371 |
sci->sc_freesegs = kbufs[4]; sci->sc_nfreesegs = argv[4].v_nmembs; |
0935db747
|
2372 |
list_splice_tail_init(&nilfs->ns_gc_inodes, &sci->sc_gc_inodes); |
9ff05123e
|
2373 2374 |
for (;;) { |
dcd761869
|
2375 |
err = nilfs_segctor_construct(sci, SC_LSEG_SR); |
9ff05123e
|
2376 |
nilfs_remove_written_gcinodes(nilfs, &sci->sc_gc_inodes); |
9ff05123e
|
2377 2378 2379 |
if (likely(!err)) break; |
d6517deb0
|
2380 |
nilfs_msg(sb, KERN_WARNING, "error %d cleaning segments", err); |
9ff05123e
|
2381 2382 2383 |
set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(sci->sc_interval); } |
3b2ce58b0
|
2384 |
if (nilfs_test_opt(nilfs, DISCARD)) { |
e902ec990
|
2385 2386 2387 |
int ret = nilfs_discard_segments(nilfs, sci->sc_freesegs, sci->sc_nfreesegs); if (ret) { |
feee880fa
|
2388 2389 2390 |
nilfs_msg(sb, KERN_WARNING, "error %d on discard request, turning discards off for the device", ret); |
3b2ce58b0
|
2391 |
nilfs_clear_opt(nilfs, DISCARD); |
e902ec990
|
2392 2393 |
} } |
9ff05123e
|
2394 2395 |
out_unlock: |
071cb4b81
|
2396 2397 |
sci->sc_freesegs = NULL; sci->sc_nfreesegs = 0; |
c1c1d7092
|
2398 |
nilfs_mdt_clear_shadow_map(nilfs->ns_dat); |
f7545144c
|
2399 |
nilfs_transaction_unlock(sb); |
9ff05123e
|
2400 2401 2402 2403 2404 |
return err; } static void nilfs_segctor_thread_construct(struct nilfs_sc_info *sci, int mode) { |
9ff05123e
|
2405 |
struct nilfs_transaction_info ti; |
9ff05123e
|
2406 |
|
f7545144c
|
2407 |
nilfs_transaction_lock(sci->sc_super, &ti, 0); |
dcd761869
|
2408 |
nilfs_segctor_construct(sci, mode); |
9ff05123e
|
2409 2410 2411 2412 2413 2414 2415 2416 |
/* * Unclosed segment should be retried. We do this using sc_timer. * Timeout of sc_timer will invoke complete construction which leads * to close the current logical segment. */ if (test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags)) nilfs_segctor_start_timer(sci); |
f7545144c
|
2417 |
nilfs_transaction_unlock(sci->sc_super); |
9ff05123e
|
2418 2419 2420 2421 2422 |
} static void nilfs_segctor_do_immediate_flush(struct nilfs_sc_info *sci) { int mode = 0; |
9ff05123e
|
2423 2424 2425 2426 2427 2428 2429 |
spin_lock(&sci->sc_state_lock); mode = (sci->sc_flush_request & FLUSH_DAT_BIT) ? SC_FLUSH_DAT : SC_FLUSH_FILE; spin_unlock(&sci->sc_state_lock); if (mode) { |
09ef29e0f
|
2430 |
nilfs_segctor_do_construct(sci, mode); |
9ff05123e
|
2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 |
spin_lock(&sci->sc_state_lock); sci->sc_flush_request &= (mode == SC_FLUSH_FILE) ? ~FLUSH_FILE_BIT : ~FLUSH_DAT_BIT; spin_unlock(&sci->sc_state_lock); } clear_bit(NILFS_SC_PRIOR_FLUSH, &sci->sc_flags); } static int nilfs_segctor_flush_mode(struct nilfs_sc_info *sci) { if (!test_bit(NILFS_SC_UNCLOSED, &sci->sc_flags) || time_before(jiffies, sci->sc_lseg_stime + sci->sc_mjcp_freq)) { if (!(sci->sc_flush_request & ~FLUSH_FILE_BIT)) return SC_FLUSH_FILE; else if (!(sci->sc_flush_request & ~FLUSH_DAT_BIT)) return SC_FLUSH_DAT; } return SC_LSEG_SR; } /** * nilfs_segctor_thread - main loop of the segment constructor thread. * @arg: pointer to a struct nilfs_sc_info. * * nilfs_segctor_thread() initializes a timer and serves as a daemon * to execute segment constructions. */ static int nilfs_segctor_thread(void *arg) { struct nilfs_sc_info *sci = (struct nilfs_sc_info *)arg; |
e3154e974
|
2462 |
struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123e
|
2463 |
int timeout = 0; |
fdce895ea
|
2464 2465 |
sci->sc_timer.data = (unsigned long)current; sci->sc_timer.function = nilfs_construction_timeout; |
9ff05123e
|
2466 2467 2468 2469 |
/* start sync. */ sci->sc_task = current; wake_up(&sci->sc_wait_task); /* for nilfs_segctor_start_thread() */ |
feee880fa
|
2470 2471 2472 |
nilfs_msg(sci->sc_super, KERN_INFO, "segctord starting. Construction interval = %lu seconds, CP frequency < %lu seconds", sci->sc_interval / HZ, sci->sc_mjcp_freq / HZ); |
9ff05123e
|
2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 |
spin_lock(&sci->sc_state_lock); loop: for (;;) { int mode; if (sci->sc_state & NILFS_SEGCTOR_QUIT) goto end_thread; if (timeout || sci->sc_seq_request != sci->sc_seq_done) mode = SC_LSEG_SR; |
7f00184e9
|
2484 |
else if (sci->sc_flush_request) |
9ff05123e
|
2485 |
mode = nilfs_segctor_flush_mode(sci); |
7f00184e9
|
2486 2487 |
else break; |
9ff05123e
|
2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 |
spin_unlock(&sci->sc_state_lock); nilfs_segctor_thread_construct(sci, mode); spin_lock(&sci->sc_state_lock); timeout = 0; } if (freezing(current)) { spin_unlock(&sci->sc_state_lock); |
a0acae0e8
|
2498 |
try_to_freeze(); |
9ff05123e
|
2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 |
spin_lock(&sci->sc_state_lock); } else { DEFINE_WAIT(wait); int should_sleep = 1; prepare_to_wait(&sci->sc_wait_daemon, &wait, TASK_INTERRUPTIBLE); if (sci->sc_seq_request != sci->sc_seq_done) should_sleep = 0; else if (sci->sc_flush_request) should_sleep = 0; else if (sci->sc_state & NILFS_SEGCTOR_COMMIT) should_sleep = time_before(jiffies, |
fdce895ea
|
2513 |
sci->sc_timer.expires); |
9ff05123e
|
2514 2515 2516 2517 2518 2519 2520 2521 |
if (should_sleep) { spin_unlock(&sci->sc_state_lock); schedule(); spin_lock(&sci->sc_state_lock); } finish_wait(&sci->sc_wait_daemon, &wait); timeout = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) && |
fdce895ea
|
2522 |
time_after_eq(jiffies, sci->sc_timer.expires)); |
e605f0a72
|
2523 2524 |
if (nilfs_sb_dirty(nilfs) && nilfs_sb_need_update(nilfs)) |
1dfa27105
|
2525 |
set_nilfs_discontinued(nilfs); |
9ff05123e
|
2526 2527 2528 2529 2530 |
} goto loop; end_thread: spin_unlock(&sci->sc_state_lock); |
9ff05123e
|
2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 |
/* end sync. */ sci->sc_task = NULL; wake_up(&sci->sc_wait_task); /* for nilfs_segctor_kill_thread() */ return 0; } static int nilfs_segctor_start_thread(struct nilfs_sc_info *sci) { struct task_struct *t; t = kthread_run(nilfs_segctor_thread, sci, "segctord"); if (IS_ERR(t)) { int err = PTR_ERR(t); |
feee880fa
|
2545 2546 |
nilfs_msg(sci->sc_super, KERN_ERR, "error %d creating segctord thread", err); |
9ff05123e
|
2547 2548 2549 2550 2551 2552 2553 |
return err; } wait_event(sci->sc_wait_task, sci->sc_task != NULL); return 0; } static void nilfs_segctor_kill_thread(struct nilfs_sc_info *sci) |
6b81e14e6
|
2554 2555 |
__acquires(&sci->sc_state_lock) __releases(&sci->sc_state_lock) |
9ff05123e
|
2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 |
{ sci->sc_state |= NILFS_SEGCTOR_QUIT; while (sci->sc_task) { wake_up(&sci->sc_wait_daemon); spin_unlock(&sci->sc_state_lock); wait_event(sci->sc_wait_task, sci->sc_task == NULL); spin_lock(&sci->sc_state_lock); } } |
9ff05123e
|
2566 2567 2568 |
/* * Setup & clean-up functions */ |
f7545144c
|
2569 |
static struct nilfs_sc_info *nilfs_segctor_new(struct super_block *sb, |
e912a5b66
|
2570 |
struct nilfs_root *root) |
9ff05123e
|
2571 |
{ |
e3154e974
|
2572 |
struct the_nilfs *nilfs = sb->s_fs_info; |
9ff05123e
|
2573 2574 2575 2576 2577 |
struct nilfs_sc_info *sci; sci = kzalloc(sizeof(*sci), GFP_KERNEL); if (!sci) return NULL; |
f7545144c
|
2578 |
sci->sc_super = sb; |
9ff05123e
|
2579 |
|
e912a5b66
|
2580 2581 |
nilfs_get_root(root); sci->sc_root = root; |
9ff05123e
|
2582 2583 2584 2585 2586 2587 |
init_waitqueue_head(&sci->sc_wait_request); init_waitqueue_head(&sci->sc_wait_daemon); init_waitqueue_head(&sci->sc_wait_task); spin_lock_init(&sci->sc_state_lock); INIT_LIST_HEAD(&sci->sc_dirty_files); INIT_LIST_HEAD(&sci->sc_segbufs); |
a694291a6
|
2588 |
INIT_LIST_HEAD(&sci->sc_write_logs); |
9ff05123e
|
2589 |
INIT_LIST_HEAD(&sci->sc_gc_inodes); |
7ef3ff2fe
|
2590 2591 |
INIT_LIST_HEAD(&sci->sc_iput_queue); INIT_WORK(&sci->sc_iput_work, nilfs_iput_work_func); |
fdce895ea
|
2592 |
init_timer(&sci->sc_timer); |
9ff05123e
|
2593 2594 2595 2596 |
sci->sc_interval = HZ * NILFS_SC_DEFAULT_TIMEOUT; sci->sc_mjcp_freq = HZ * NILFS_SC_DEFAULT_SR_FREQ; sci->sc_watermark = NILFS_SC_DEFAULT_WATERMARK; |
574e6c314
|
2597 |
if (nilfs->ns_interval) |
071d73cfe
|
2598 |
sci->sc_interval = HZ * nilfs->ns_interval; |
574e6c314
|
2599 2600 |
if (nilfs->ns_watermark) sci->sc_watermark = nilfs->ns_watermark; |
9ff05123e
|
2601 2602 2603 2604 2605 2606 |
return sci; } static void nilfs_segctor_write_out(struct nilfs_sc_info *sci) { int ret, retrycount = NILFS_SC_CLEANUP_RETRY; |
076a378ba
|
2607 2608 2609 2610 |
/* * The segctord thread was stopped and its timer was removed. * But some tasks remain. */ |
9ff05123e
|
2611 |
do { |
9ff05123e
|
2612 |
struct nilfs_transaction_info ti; |
9ff05123e
|
2613 |
|
f7545144c
|
2614 |
nilfs_transaction_lock(sci->sc_super, &ti, 0); |
dcd761869
|
2615 |
ret = nilfs_segctor_construct(sci, SC_LSEG_SR); |
f7545144c
|
2616 |
nilfs_transaction_unlock(sci->sc_super); |
9ff05123e
|
2617 |
|
7ef3ff2fe
|
2618 |
flush_work(&sci->sc_iput_work); |
9ff05123e
|
2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 |
} while (ret && retrycount-- > 0); } /** * nilfs_segctor_destroy - destroy the segment constructor. * @sci: nilfs_sc_info * * nilfs_segctor_destroy() kills the segctord thread and frees * the nilfs_sc_info struct. * Caller must hold the segment semaphore. */ static void nilfs_segctor_destroy(struct nilfs_sc_info *sci) { |
e3154e974
|
2632 |
struct the_nilfs *nilfs = sci->sc_super->s_fs_info; |
9ff05123e
|
2633 |
int flag; |
693dd3212
|
2634 |
up_write(&nilfs->ns_segctor_sem); |
9ff05123e
|
2635 2636 2637 2638 2639 2640 |
spin_lock(&sci->sc_state_lock); nilfs_segctor_kill_thread(sci); flag = ((sci->sc_state & NILFS_SEGCTOR_COMMIT) || sci->sc_flush_request || sci->sc_seq_request != sci->sc_seq_done); spin_unlock(&sci->sc_state_lock); |
7ef3ff2fe
|
2641 2642 |
if (flush_work(&sci->sc_iput_work)) flag = true; |
3256a0553
|
2643 |
if (flag || !nilfs_segctor_confirm(sci)) |
9ff05123e
|
2644 |
nilfs_segctor_write_out(sci); |
9ff05123e
|
2645 |
if (!list_empty(&sci->sc_dirty_files)) { |
d6517deb0
|
2646 2647 |
nilfs_msg(sci->sc_super, KERN_WARNING, "disposed unprocessed dirty file(s) when stopping log writer"); |
693dd3212
|
2648 |
nilfs_dispose_list(nilfs, &sci->sc_dirty_files, 1); |
9ff05123e
|
2649 |
} |
9ff05123e
|
2650 |
|
7ef3ff2fe
|
2651 |
if (!list_empty(&sci->sc_iput_queue)) { |
d6517deb0
|
2652 2653 |
nilfs_msg(sci->sc_super, KERN_WARNING, "disposed unprocessed inode(s) in iput queue when stopping log writer"); |
7ef3ff2fe
|
2654 2655 |
nilfs_dispose_list(nilfs, &sci->sc_iput_queue, 1); } |
1f5abe7e7
|
2656 |
WARN_ON(!list_empty(&sci->sc_segbufs)); |
a694291a6
|
2657 |
WARN_ON(!list_empty(&sci->sc_write_logs)); |
9ff05123e
|
2658 |
|
e912a5b66
|
2659 |
nilfs_put_root(sci->sc_root); |
693dd3212
|
2660 |
down_write(&nilfs->ns_segctor_sem); |
9ff05123e
|
2661 |
|
fdce895ea
|
2662 |
del_timer_sync(&sci->sc_timer); |
9ff05123e
|
2663 2664 2665 2666 |
kfree(sci); } /** |
f7545144c
|
2667 2668 |
* nilfs_attach_log_writer - attach log writer * @sb: super block instance |
e912a5b66
|
2669 |
* @root: root object of the current filesystem tree |
9ff05123e
|
2670 |
* |
f7545144c
|
2671 2672 |
* This allocates a log writer object, initializes it, and starts the * log writer. |
9ff05123e
|
2673 2674 2675 2676 2677 2678 |
* * Return Value: On success, 0 is returned. On error, one of the following * negative error code is returned. * * %-ENOMEM - Insufficient memory available. */ |
f7545144c
|
2679 |
int nilfs_attach_log_writer(struct super_block *sb, struct nilfs_root *root) |
9ff05123e
|
2680 |
{ |
e3154e974
|
2681 |
struct the_nilfs *nilfs = sb->s_fs_info; |
9ff05123e
|
2682 |
int err; |
3fd3fe5ae
|
2683 |
if (nilfs->ns_writer) { |
fe5f171bb
|
2684 2685 2686 2687 2688 |
/* * This happens if the filesystem was remounted * read/write after nilfs_error degenerated it into a * read-only mount. */ |
f7545144c
|
2689 |
nilfs_detach_log_writer(sb); |
fe5f171bb
|
2690 |
} |
f7545144c
|
2691 |
nilfs->ns_writer = nilfs_segctor_new(sb, root); |
3fd3fe5ae
|
2692 |
if (!nilfs->ns_writer) |
9ff05123e
|
2693 |
return -ENOMEM; |
3fd3fe5ae
|
2694 |
err = nilfs_segctor_start_thread(nilfs->ns_writer); |
9ff05123e
|
2695 |
if (err) { |
3fd3fe5ae
|
2696 2697 |
kfree(nilfs->ns_writer); nilfs->ns_writer = NULL; |
9ff05123e
|
2698 2699 2700 2701 2702 |
} return err; } /** |
f7545144c
|
2703 2704 |
* nilfs_detach_log_writer - destroy log writer * @sb: super block instance |
9ff05123e
|
2705 |
* |
f7545144c
|
2706 2707 |
* This kills log writer daemon, frees the log writer object, and * destroys list of dirty files. |
9ff05123e
|
2708 |
*/ |
f7545144c
|
2709 |
void nilfs_detach_log_writer(struct super_block *sb) |
9ff05123e
|
2710 |
{ |
e3154e974
|
2711 |
struct the_nilfs *nilfs = sb->s_fs_info; |
9ff05123e
|
2712 2713 2714 |
LIST_HEAD(garbage_list); down_write(&nilfs->ns_segctor_sem); |
3fd3fe5ae
|
2715 2716 2717 |
if (nilfs->ns_writer) { nilfs_segctor_destroy(nilfs->ns_writer); nilfs->ns_writer = NULL; |
9ff05123e
|
2718 2719 2720 |
} /* Force to free the list of dirty files */ |
693dd3212
|
2721 2722 2723 |
spin_lock(&nilfs->ns_inode_lock); if (!list_empty(&nilfs->ns_dirty_files)) { list_splice_init(&nilfs->ns_dirty_files, &garbage_list); |
d6517deb0
|
2724 2725 |
nilfs_msg(sb, KERN_WARNING, "disposed unprocessed dirty file(s) when detaching log writer"); |
9ff05123e
|
2726 |
} |
693dd3212
|
2727 |
spin_unlock(&nilfs->ns_inode_lock); |
9ff05123e
|
2728 |
up_write(&nilfs->ns_segctor_sem); |
693dd3212
|
2729 |
nilfs_dispose_list(nilfs, &garbage_list, 1); |
9ff05123e
|
2730 |
} |