cregit-Linux how code gets into the kernel

Release 4.10 fs/gfs2/trans.c

Directory: fs/gfs2
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/kallsyms.h>
#include <linux/gfs2_ondisk.h>

#include "gfs2.h"
#include "incore.h"
#include "glock.h"
#include "inode.h"
#include "log.h"
#include "lops.h"
#include "meta_io.h"
#include "trans.h"
#include "util.h"
#include "trace_gfs2.h"

int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks, unsigned int revokes) { struct gfs2_trans *tr; int error; BUG_ON(current->journal_info); BUG_ON(blocks == 0 && revokes == 0); if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) return -EROFS; tr = kzalloc(sizeof(struct gfs2_trans), GFP_NOFS); if (!tr) return -ENOMEM; tr->tr_ip = _RET_IP_; tr->tr_blocks = blocks; tr->tr_revokes = revokes; tr->tr_reserved = 1; tr->tr_alloced = 1; if (blocks) tr->tr_reserved += 6 + blocks; if (revokes) tr->tr_reserved += gfs2_struct2blk(sdp, revokes, sizeof(u64)); INIT_LIST_HEAD(&tr->tr_databuf); INIT_LIST_HEAD(&tr->tr_buf); sb_start_intwrite(sdp->sd_vfs); error = gfs2_log_reserve(sdp, tr->tr_reserved); if (error) goto fail; current->journal_info = tr; return 0; fail: sb_end_intwrite(sdp->sd_vfs); kfree(tr); return error; }


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static void gfs2_print_trans(const struct gfs2_trans *tr) { pr_warn("Transaction created at: %pSR\n", (void *)tr->tr_ip); pr_warn("blocks=%u revokes=%u reserved=%u touched=%u\n", tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched); pr_warn("Buf %u/%u Databuf %u/%u Revoke %u/%u\n", tr->tr_num_buf_new, tr->tr_num_buf_rm, tr->tr_num_databuf_new, tr->tr_num_databuf_rm, tr->tr_num_revoke, tr->tr_num_revoke_rm); }


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void gfs2_trans_end(struct gfs2_sbd *sdp) { struct gfs2_trans *tr = current->journal_info; s64 nbuf; int alloced = tr->tr_alloced; BUG_ON(!tr); current->journal_info = NULL; if (!tr->tr_touched) { gfs2_log_release(sdp, tr->tr_reserved); if (alloced) { kfree(tr); sb_end_intwrite(sdp->sd_vfs); } return; } nbuf = tr->tr_num_buf_new + tr->tr_num_databuf_new; nbuf -= tr->tr_num_buf_rm; nbuf -= tr->tr_num_databuf_rm; if (gfs2_assert_withdraw(sdp, (nbuf <= tr->tr_blocks) && (tr->tr_num_revoke <= tr->tr_revokes))) gfs2_print_trans(tr); gfs2_log_commit(sdp, tr); if (alloced && !tr->tr_attached) kfree(tr); up_read(&sdp->sd_log_flush_lock); if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS) gfs2_log_flush(sdp, NULL, NORMAL_FLUSH); if (alloced) sb_end_intwrite(sdp->sd_vfs); }


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static struct gfs2_bufdata *gfs2_alloc_bufdata(struct gfs2_glock *gl, struct buffer_head *bh, const struct gfs2_log_operations *lops) { struct gfs2_bufdata *bd; bd = kmem_cache_zalloc(gfs2_bufdata_cachep, GFP_NOFS | __GFP_NOFAIL); bd->bd_bh = bh; bd->bd_gl = gl; bd->bd_ops = lops; INIT_LIST_HEAD(&bd->bd_list); bh->b_private = bd; return bd; }


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/** * gfs2_trans_add_data - Add a databuf to the transaction. * @gl: The inode glock associated with the buffer * @bh: The buffer to add * * This is used in two distinct cases: * i) In ordered write mode * We put the data buffer on a list so that we can ensure that its * synced to disk at the right time * ii) In journaled data mode * We need to journal the data block in the same way as metadata in * the functions above. The difference is that here we have a tag * which is two __be64's being the block number (as per meta data) * and a flag which says whether the data block needs escaping or * not. This means we need a new log entry for each 251 or so data * blocks, which isn't an enormous overhead but twice as much as * for normal metadata blocks. */
void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh) { struct gfs2_trans *tr = current->journal_info; struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; struct address_space *mapping = bh->b_page->mapping; struct gfs2_inode *ip = GFS2_I(mapping->host); struct gfs2_bufdata *bd; if (!gfs2_is_jdata(ip)) { gfs2_ordered_add_inode(ip); return; } lock_buffer(bh); gfs2_log_lock(sdp); bd = bh->b_private; if (bd == NULL) { gfs2_log_unlock(sdp); unlock_buffer(bh); if (bh->b_private == NULL) bd = gfs2_alloc_bufdata(gl, bh, &gfs2_databuf_lops); else bd = bh->b_private; lock_buffer(bh); gfs2_log_lock(sdp); } gfs2_assert(sdp, bd->bd_gl == gl); tr->tr_touched = 1; if (list_empty(&bd->bd_list)) { set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); gfs2_pin(sdp, bd->bd_bh); tr->tr_num_databuf_new++; list_add_tail(&bd->bd_list, &tr->tr_databuf); } gfs2_log_unlock(sdp); unlock_buffer(bh); }


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static void meta_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) { struct gfs2_meta_header *mh; struct gfs2_trans *tr; enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state); tr = current->journal_info; tr->tr_touched = 1; if (!list_empty(&bd->bd_list)) return; set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags); mh = (struct gfs2_meta_header *)bd->bd_bh->b_data; if (unlikely(mh->mh_magic != cpu_to_be32(GFS2_MAGIC))) { pr_err("Attempting to add uninitialised block to journal (inplace block=%lld)\n", (unsigned long long)bd->bd_bh->b_blocknr); BUG(); } if (unlikely(state == SFS_FROZEN)) { printk(KERN_INFO "GFS2:adding buf while frozen\n"); gfs2_assert_withdraw(sdp, 0); } gfs2_pin(sdp, bd->bd_bh); mh->__pad0 = cpu_to_be64(0); mh->mh_jid = cpu_to_be32(sdp->sd_jdesc->jd_jid); list_add(&bd->bd_list, &tr->tr_buf); tr->tr_num_buf_new++; }


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void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh) { struct gfs2_sbd *sdp = gl->gl_name.ln_sbd; struct gfs2_bufdata *bd; lock_buffer(bh); gfs2_log_lock(sdp); bd = bh->b_private; if (bd == NULL) { gfs2_log_unlock(sdp); unlock_buffer(bh); lock_page(bh->b_page); if (bh->b_private == NULL) bd = gfs2_alloc_bufdata(gl, bh, &gfs2_buf_lops); else bd = bh->b_private; unlock_page(bh->b_page); lock_buffer(bh); gfs2_log_lock(sdp); } gfs2_assert(sdp, bd->bd_gl == gl); meta_lo_add(sdp, bd); gfs2_log_unlock(sdp); unlock_buffer(bh); }


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void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) { struct gfs2_trans *tr = current->journal_info; BUG_ON(!list_empty(&bd->bd_list)); gfs2_add_revoke(sdp, bd); tr->tr_touched = 1; tr->tr_num_revoke++; }


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void gfs2_trans_add_unrevoke(struct gfs2_sbd *sdp, u64 blkno, unsigned int len) { struct gfs2_bufdata *bd, *tmp; struct gfs2_trans *tr = current->journal_info; unsigned int n = len; gfs2_log_lock(sdp); list_for_each_entry_safe(bd, tmp, &sdp->sd_log_le_revoke, bd_list) { if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { list_del_init(&bd->bd_list); gfs2_assert_withdraw(sdp, sdp->sd_log_num_revoke); sdp->sd_log_num_revoke--; kmem_cache_free(gfs2_bufdata_cachep, bd); tr->tr_num_revoke_rm++; if (--n == 0) break; } } gfs2_log_unlock(sdp); }


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robert s. petersonrobert s. peterson21.56%112.50%

Overall Contributors

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jan karajan kara282.02%12.50%
robert s. petersonrobert s. peterson231.66%37.50%
joe perchesjoe perches151.08%25.00%
fabian frederickfabian frederick50.36%25.00%
fabio massimo di nittofabio massimo di nitto10.07%12.50%
Directory: fs/gfs2
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