diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/gfs2/trans.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/gfs2/trans.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/ANDROID_3.4.5/fs/gfs2/trans.c b/ANDROID_3.4.5/fs/gfs2/trans.c new file mode 100644 index 00000000..86ac75d9 --- /dev/null +++ b/ANDROID_3.4.5/fs/gfs2/trans.c @@ -0,0 +1,187 @@ +/* + * 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. + */ + +#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 "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 = (unsigned long)__builtin_return_address(0); + tr->tr_blocks = blocks; + tr->tr_revokes = revokes; + tr->tr_reserved = 1; + if (blocks) + tr->tr_reserved += 6 + blocks; + if (revokes) + tr->tr_reserved += gfs2_struct2blk(sdp, revokes, + sizeof(u64)); + INIT_LIST_HEAD(&tr->tr_list_buf); + + gfs2_holder_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &tr->tr_t_gh); + + error = gfs2_glock_nq(&tr->tr_t_gh); + if (error) + goto fail_holder_uninit; + + error = gfs2_log_reserve(sdp, tr->tr_reserved); + if (error) + goto fail_gunlock; + + current->journal_info = tr; + + return 0; + +fail_gunlock: + gfs2_glock_dq(&tr->tr_t_gh); + +fail_holder_uninit: + gfs2_holder_uninit(&tr->tr_t_gh); + kfree(tr); + + return error; +} + +/** + * gfs2_log_release - Release a given number of log blocks + * @sdp: The GFS2 superblock + * @blks: The number of blocks + * + */ + +static void gfs2_log_release(struct gfs2_sbd *sdp, unsigned int blks) +{ + + atomic_add(blks, &sdp->sd_log_blks_free); + trace_gfs2_log_blocks(sdp, blks); + gfs2_assert_withdraw(sdp, atomic_read(&sdp->sd_log_blks_free) <= + sdp->sd_jdesc->jd_blocks); + up_read(&sdp->sd_log_flush_lock); +} + +void gfs2_trans_end(struct gfs2_sbd *sdp) +{ + struct gfs2_trans *tr = current->journal_info; + + BUG_ON(!tr); + current->journal_info = NULL; + + if (!tr->tr_touched) { + gfs2_log_release(sdp, tr->tr_reserved); + if (tr->tr_t_gh.gh_gl) { + gfs2_glock_dq(&tr->tr_t_gh); + gfs2_holder_uninit(&tr->tr_t_gh); + kfree(tr); + } + return; + } + + if (gfs2_assert_withdraw(sdp, tr->tr_num_buf <= tr->tr_blocks)) { + fs_err(sdp, "tr_num_buf = %u, tr_blocks = %u ", + tr->tr_num_buf, tr->tr_blocks); + print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip); + } + if (gfs2_assert_withdraw(sdp, tr->tr_num_revoke <= tr->tr_revokes)) { + fs_err(sdp, "tr_num_revoke = %u, tr_revokes = %u ", + tr->tr_num_revoke, tr->tr_revokes); + print_symbol(KERN_WARNING "GFS2: Transaction created at: %s\n", tr->tr_ip); + } + + gfs2_log_commit(sdp, tr); + if (tr->tr_t_gh.gh_gl) { + gfs2_glock_dq(&tr->tr_t_gh); + gfs2_holder_uninit(&tr->tr_t_gh); + kfree(tr); + } + + if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS) + gfs2_log_flush(sdp, NULL); +} + +/** + * gfs2_trans_add_bh - Add a to-be-modified buffer to the current transaction + * @gl: the glock the buffer belongs to + * @bh: The buffer to add + * @meta: True in the case of adding metadata + * + */ + +void gfs2_trans_add_bh(struct gfs2_glock *gl, struct buffer_head *bh, int meta) +{ + struct gfs2_sbd *sdp = gl->gl_sbd; + struct gfs2_bufdata *bd; + + bd = bh->b_private; + if (bd) + gfs2_assert(sdp, bd->bd_gl == gl); + else { + gfs2_attach_bufdata(gl, bh, meta); + bd = bh->b_private; + } + lops_add(sdp, &bd->bd_le); +} + +void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd) +{ + BUG_ON(!list_empty(&bd->bd_le.le_list)); + BUG_ON(!list_empty(&bd->bd_ail_st_list)); + BUG_ON(!list_empty(&bd->bd_ail_gl_list)); + lops_init_le(&bd->bd_le, &gfs2_revoke_lops); + lops_add(sdp, &bd->bd_le); +} + +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_le.le_list) { + if ((bd->bd_blkno >= blkno) && (bd->bd_blkno < (blkno + len))) { + list_del_init(&bd->bd_le.le_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); +} + |