diff options
Diffstat (limited to 'fs/xfs/xfs_trans.c')
| -rw-r--r-- | fs/xfs/xfs_trans.c | 1315 |
1 files changed, 1315 insertions, 0 deletions
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c new file mode 100644 index 000000000000..3db0e2200775 --- /dev/null +++ b/fs/xfs/xfs_trans.c @@ -0,0 +1,1315 @@ +/* + * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + * Further, this software is distributed without any warranty that it is + * free of the rightful claim of any third person regarding infringement + * or the like. Any license provided herein, whether implied or + * otherwise, applies only to this software file. Patent licenses, if + * any, provided herein do not apply to combinations of this program with + * other software, or any other product whatsoever. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston MA 02111-1307, USA. + * + * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, + * Mountain View, CA 94043, or: + * + * http://www.sgi.com + * + * For further information regarding this notice, see: + * + * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ + */ + +#include "xfs.h" +#include "xfs_macros.h" +#include "xfs_types.h" +#include "xfs_inum.h" +#include "xfs_log.h" +#include "xfs_trans.h" +#include "xfs_sb.h" +#include "xfs_ag.h" +#include "xfs_dir.h" +#include "xfs_dir2.h" +#include "xfs_dmapi.h" +#include "xfs_mount.h" +#include "xfs_error.h" +#include "xfs_trans_priv.h" +#include "xfs_alloc_btree.h" +#include "xfs_bmap_btree.h" +#include "xfs_ialloc_btree.h" +#include "xfs_btree.h" +#include "xfs_ialloc.h" +#include "xfs_alloc.h" +#include "xfs_attr_sf.h" +#include "xfs_dir_sf.h" +#include "xfs_dir2_sf.h" +#include "xfs_dinode.h" +#include "xfs_inode.h" +#include "xfs_bmap.h" +#include "xfs_da_btree.h" +#include "xfs_quota.h" +#include "xfs_trans_space.h" + + +STATIC void xfs_trans_apply_sb_deltas(xfs_trans_t *); +STATIC uint xfs_trans_count_vecs(xfs_trans_t *); +STATIC void xfs_trans_fill_vecs(xfs_trans_t *, xfs_log_iovec_t *); +STATIC void xfs_trans_uncommit(xfs_trans_t *, uint); +STATIC void xfs_trans_committed(xfs_trans_t *, int); +STATIC void xfs_trans_chunk_committed(xfs_log_item_chunk_t *, xfs_lsn_t, int); +STATIC void xfs_trans_free(xfs_trans_t *); + +kmem_zone_t *xfs_trans_zone; + + +/* + * Initialize the precomputed transaction reservation values + * in the mount structure. + */ +void +xfs_trans_init( + xfs_mount_t *mp) +{ + xfs_trans_reservations_t *resp; + + resp = &(mp->m_reservations); + resp->tr_write = + (uint)(XFS_CALC_WRITE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); + resp->tr_itruncate = + (uint)(XFS_CALC_ITRUNCATE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); + resp->tr_rename = + (uint)(XFS_CALC_RENAME_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); + resp->tr_link = (uint)XFS_CALC_LINK_LOG_RES(mp); + resp->tr_remove = + (uint)(XFS_CALC_REMOVE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); + resp->tr_symlink = + (uint)(XFS_CALC_SYMLINK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); + resp->tr_create = + (uint)(XFS_CALC_CREATE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); + resp->tr_mkdir = + (uint)(XFS_CALC_MKDIR_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); + resp->tr_ifree = + (uint)(XFS_CALC_IFREE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); + resp->tr_ichange = + (uint)(XFS_CALC_ICHANGE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); + resp->tr_growdata = (uint)XFS_CALC_GROWDATA_LOG_RES(mp); + resp->tr_swrite = (uint)XFS_CALC_SWRITE_LOG_RES(mp); + resp->tr_writeid = (uint)XFS_CALC_WRITEID_LOG_RES(mp); + resp->tr_addafork = + (uint)(XFS_CALC_ADDAFORK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); + resp->tr_attrinval = (uint)XFS_CALC_ATTRINVAL_LOG_RES(mp); + resp->tr_attrset = + (uint)(XFS_CALC_ATTRSET_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); + resp->tr_attrrm = + (uint)(XFS_CALC_ATTRRM_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp)); + resp->tr_clearagi = (uint)XFS_CALC_CLEAR_AGI_BUCKET_LOG_RES(mp); + resp->tr_growrtalloc = (uint)XFS_CALC_GROWRTALLOC_LOG_RES(mp); + resp->tr_growrtzero = (uint)XFS_CALC_GROWRTZERO_LOG_RES(mp); + resp->tr_growrtfree = (uint)XFS_CALC_GROWRTFREE_LOG_RES(mp); +} + +/* + * This routine is called to allocate a transaction structure. + * The type parameter indicates the type of the transaction. These + * are enumerated in xfs_trans.h. + * + * Dynamically allocate the transaction structure from the transaction + * zone, initialize it, and return it to the caller. + */ +xfs_trans_t * +xfs_trans_alloc( + xfs_mount_t *mp, + uint type) +{ + fs_check_frozen(XFS_MTOVFS(mp), SB_FREEZE_TRANS); + atomic_inc(&mp->m_active_trans); + + return (_xfs_trans_alloc(mp, type)); + +} + +xfs_trans_t * +_xfs_trans_alloc( + xfs_mount_t *mp, + uint type) +{ + xfs_trans_t *tp; + + ASSERT(xfs_trans_zone != NULL); + tp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP); + + /* + * Initialize the transaction structure. + */ + tp->t_magic = XFS_TRANS_MAGIC; + tp->t_type = type; + tp->t_mountp = mp; + tp->t_items_free = XFS_LIC_NUM_SLOTS; + tp->t_busy_free = XFS_LBC_NUM_SLOTS; + XFS_LIC_INIT(&(tp->t_items)); + XFS_LBC_INIT(&(tp->t_busy)); + + return (tp); +} + +/* + * This is called to create a new transaction which will share the + * permanent log reservation of the given transaction. The remaining + * unused block and rt extent reservations are also inherited. This + * implies that the original transaction is no longer allowed to allocate + * blocks. Locks and log items, however, are no inherited. They must + * be added to the new transaction explicitly. + */ +xfs_trans_t * +xfs_trans_dup( + xfs_trans_t *tp) +{ + xfs_trans_t *ntp; + + ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP); + + /* + * Initialize the new transaction structure. + */ + ntp->t_magic = XFS_TRANS_MAGIC; + ntp->t_type = tp->t_type; + ntp->t_mountp = tp->t_mountp; + ntp->t_items_free = XFS_LIC_NUM_SLOTS; + ntp->t_busy_free = XFS_LBC_NUM_SLOTS; + XFS_LIC_INIT(&(ntp->t_items)); + XFS_LBC_INIT(&(ntp->t_busy)); + + ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); + +#if defined(XLOG_NOLOG) || defined(DEBUG) + ASSERT(!xlog_debug || tp->t_ticket != NULL); +#else + ASSERT(tp->t_ticket != NULL); +#endif + ntp->t_flags = XFS_TRANS_PERM_LOG_RES | (tp->t_flags & XFS_TRANS_RESERVE); + ntp->t_ticket = tp->t_ticket; + ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used; + tp->t_blk_res = tp->t_blk_res_used; + ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used; + tp->t_rtx_res = tp->t_rtx_res_used; + PFLAGS_DUP(&tp->t_pflags, &ntp->t_pflags); + + XFS_TRANS_DUP_DQINFO(tp->t_mountp, tp, ntp); + + atomic_inc(&tp->t_mountp->m_active_trans); + return ntp; +} + +/* + * This is called to reserve free disk blocks and log space for the + * given transaction. This must be done before allocating any resources + * within the transaction. + * + * This will return ENOSPC if there are not enough blocks available. + * It will sleep waiting for available log space. + * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which + * is used by long running transactions. If any one of the reservations + * fails then they will all be backed out. + * + * This does not do quota reservations. That typically is done by the + * caller afterwards. + */ +int +xfs_trans_reserve( + xfs_trans_t *tp, + uint blocks, + uint logspace, + uint rtextents, + uint flags, + uint logcount) +{ + int log_flags; + int error; + int rsvd; + + error = 0; + rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0; + + /* Mark this thread as being in a transaction */ + PFLAGS_SET_FSTRANS(&tp->t_pflags); + + /* + * Attempt to reserve the needed disk blocks by decrementing + * the number needed from the number available. This will + * fail if the count would go below zero. + */ + if (blocks > 0) { + error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FDBLOCKS, + -blocks, rsvd); + if (error != 0) { + PFLAGS_RESTORE_FSTRANS(&tp->t_pflags); + return (XFS_ERROR(ENOSPC)); + } + tp->t_blk_res += blocks; + } + + /* + * Reserve the log space needed for this transaction. + */ + if (logspace > 0) { + ASSERT((tp->t_log_res == 0) || (tp->t_log_res == logspace)); + ASSERT((tp->t_log_count == 0) || + (tp->t_log_count == logcount)); + if (flags & XFS_TRANS_PERM_LOG_RES) { + log_flags = XFS_LOG_PERM_RESERV; + tp->t_flags |= XFS_TRANS_PERM_LOG_RES; + } else { + ASSERT(tp->t_ticket == NULL); + ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES)); + log_flags = 0; + } + + error = xfs_log_reserve(tp->t_mountp, logspace, logcount, + &tp->t_ticket, + XFS_TRANSACTION, log_flags); + if (error) { + goto undo_blocks; + } + tp->t_log_res = logspace; + tp->t_log_count = logcount; + } + + /* + * Attempt to reserve the needed realtime extents by decrementing + * the number needed from the number available. This will + * fail if the count would go below zero. + */ + if (rtextents > 0) { + error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FREXTENTS, + -rtextents, rsvd); + if (error) { + error = XFS_ERROR(ENOSPC); + goto undo_log; + } + tp->t_rtx_res += rtextents; + } + + return 0; + + /* + * Error cases jump to one of these labels to undo any + * reservations which have already been performed. + */ +undo_log: + if (logspace > 0) { + if (flags & XFS_TRANS_PERM_LOG_RES) { + log_flags = XFS_LOG_REL_PERM_RESERV; + } else { + log_flags = 0; + } + xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, log_flags); + tp->t_ticket = NULL; + tp->t_log_res = 0; + tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES; + } + +undo_blocks: + if (blocks > 0) { + (void) xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FDBLOCKS, + blocks, rsvd); + tp->t_blk_res = 0; + } + + PFLAGS_RESTORE_FSTRANS(&tp->t_pflags); + + return (error); +} + + +/* + * This is called to set the a callback to be called when the given + * transaction is committed to disk. The transaction pointer and the + * argument pointer will be passed to the callback routine. + * + * Only one callback can be associated with any single transaction. + */ +void +xfs_trans_callback( + xfs_trans_t *tp, + xfs_trans_callback_t callback, + void *arg) +{ + ASSERT(tp->t_callback == NULL); + tp->t_callback = callback; + tp->t_callarg = arg; +} + + +/* + * Record the indicated change to the given field for application + * to the file system's superblock when the transaction commits. + * For now, just store the change in the transaction structure. + * + * Mark the transaction structure to indicate that the superblock + * needs to be updated before committing. + */ +void +xfs_trans_mod_sb( + xfs_trans_t *tp, + uint field, + long delta) +{ + + switch (field) { + case XFS_TRANS_SB_ICOUNT: + tp->t_icount_delta += delta; + break; + case XFS_TRANS_SB_IFREE: + tp->t_ifree_delta += delta; + break; + case XFS_TRANS_SB_FDBLOCKS: + /* + * Track the number of blocks allocated in the + * transaction. Make sure it does not exceed the + * number reserved. + */ + if (delta < 0) { + tp->t_blk_res_used += (uint)-delta; + ASSERT(tp->t_blk_res_used <= tp->t_blk_res); + } + tp->t_fdblocks_delta += delta; + break; + case XFS_TRANS_SB_RES_FDBLOCKS: + /* + * The allocation has already been applied to the + * in-core superblock's counter. This should only + * be applied to the on-disk superblock. + */ + ASSERT(delta < 0); + tp->t_res_fdblocks_delta += delta; + break; + case XFS_TRANS_SB_FREXTENTS: + /* + * Track the number of blocks allocated in the + * transaction. Make sure it does not exceed the + * number reserved. + */ + if (delta < 0) { + tp->t_rtx_res_used += (uint)-delta; + ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res); + } + tp->t_frextents_delta += delta; + break; + case XFS_TRANS_SB_RES_FREXTENTS: + /* + * The allocation has already been applied to the + * in-core superblocks's counter. This should only + * be applied to the on-disk superblock. + */ + ASSERT(delta < 0); + tp->t_res_frextents_delta += delta; + break; + case XFS_TRANS_SB_DBLOCKS: + ASSERT(delta > 0); + tp->t_dblocks_delta += delta; + break; + case XFS_TRANS_SB_AGCOUNT: + ASSERT(delta > 0); + tp->t_agcount_delta += delta; + break; + case XFS_TRANS_SB_IMAXPCT: + tp->t_imaxpct_delta += delta; + break; + case XFS_TRANS_SB_REXTSIZE: + tp->t_rextsize_delta += delta; + break; + case XFS_TRANS_SB_RBMBLOCKS: + tp->t_rbmblocks_delta += delta; + break; + case XFS_TRANS_SB_RBLOCKS: + tp->t_rblocks_delta += delta; + break; + case XFS_TRANS_SB_REXTENTS: + tp->t_rextents_delta += delta; + break; + case XFS_TRANS_SB_REXTSLOG: + tp->t_rextslog_delta += delta; + break; + default: + ASSERT(0); + return; + } + + tp->t_flags |= (XFS_TRANS_SB_DIRTY | XFS_TRANS_DIRTY); +} + +/* + * xfs_trans_apply_sb_deltas() is called from the commit code + * to bring the superblock buffer into the current transaction + * and modify it as requested by earlier calls to xfs_trans_mod_sb(). + * + * For now we just look at each field allowed to change and change + * it if necessary. + */ +STATIC void +xfs_trans_apply_sb_deltas( + xfs_trans_t *tp) +{ + xfs_sb_t *sbp; + xfs_buf_t *bp; + int whole = 0; + + bp = xfs_trans_getsb(tp, tp->t_mountp, 0); + sbp = XFS_BUF_TO_SBP(bp); + + /* + * Check that superblock mods match the mods made to AGF counters. + */ + ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) == + (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta + + tp->t_ag_btree_delta)); + + if (tp->t_icount_delta != 0) { + INT_MOD(sbp->sb_icount, ARCH_CONVERT, tp->t_icount_delta); + } + if (tp->t_ifree_delta != 0) { + INT_MOD(sbp->sb_ifree, ARCH_CONVERT, tp->t_ifree_delta); + } + + if (tp->t_fdblocks_delta != 0) { + INT_MOD(sbp->sb_fdblocks, ARCH_CONVERT, tp->t_fdblocks_delta); + } + if (tp->t_res_fdblocks_delta != 0) { + INT_MOD(sbp->sb_fdblocks, ARCH_CONVERT, tp->t_res_fdblocks_delta); + } + + if (tp->t_frextents_delta != 0) { + INT_MOD(sbp->sb_frextents, ARCH_CONVERT, tp->t_frextents_delta); + } + if (tp->t_res_frextents_delta != 0) { + INT_MOD(sbp->sb_frextents, ARCH_CONVERT, tp->t_res_frextents_delta); + } + if (tp->t_dblocks_delta != 0) { + INT_MOD(sbp->sb_dblocks, ARCH_CONVERT, tp->t_dblocks_delta); + whole = 1; + } + if (tp->t_agcount_delta != 0) { + INT_MOD(sbp->sb_agcount, ARCH_CONVERT, tp->t_agcount_delta); + whole = 1; + } + if (tp->t_imaxpct_delta != 0) { + INT_MOD(sbp->sb_imax_pct, ARCH_CONVERT, tp->t_imaxpct_delta); + whole = 1; + } + if (tp->t_rextsize_delta != 0) { + INT_MOD(sbp->sb_rextsize, ARCH_CONVERT, tp->t_rextsize_delta); + whole = 1; + } + if (tp->t_rbmblocks_delta != 0) { + INT_MOD(sbp->sb_rbmblocks, ARCH_CONVERT, tp->t_rbmblocks_delta); + whole = 1; + } + if (tp->t_rblocks_delta != 0) { + INT_MOD(sbp->sb_rblocks, ARCH_CONVERT, tp->t_rblocks_delta); + whole = 1; + } + if (tp->t_rextents_delta != 0) { + INT_MOD(sbp->sb_rextents, ARCH_CONVERT, tp->t_rextents_delta); + whole = 1; + } + if (tp->t_rextslog_delta != 0) { + INT_MOD(sbp->sb_rextslog, ARCH_CONVERT, tp->t_rextslog_delta); + whole = 1; + } + + if (whole) + /* + * Log the whole thing, the fields are discontiguous. + */ + xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_sb_t) - 1); + else + /* + * Since all the modifiable fields are contiguous, we + * can get away with this. + */ + xfs_trans_log_buf(tp, bp, offsetof(xfs_sb_t, sb_icount), + offsetof(xfs_sb_t, sb_frextents) + + sizeof(sbp->sb_frextents) - 1); + + XFS_MTOVFS(tp->t_mountp)->vfs_super->s_dirt = 1; +} + +/* + * xfs_trans_unreserve_and_mod_sb() is called to release unused + * reservations and apply superblock counter changes to the in-core + * superblock. + * + * This is done efficiently with a single call to xfs_mod_incore_sb_batch(). + */ +void +xfs_trans_unreserve_and_mod_sb( + xfs_trans_t *tp) +{ + xfs_mod_sb_t msb[14]; /* If you add cases, add entries */ + xfs_mod_sb_t *msbp; + /* REFERENCED */ + int error; + int rsvd; + + msbp = msb; + rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0; + + /* + * Release any reserved blocks. Any that were allocated + * will be taken back again by fdblocks_delta below. + */ + if (tp->t_blk_res > 0) { + msbp->msb_field = XFS_SBS_FDBLOCKS; + msbp->msb_delta = tp->t_blk_res; + msbp++; + } + + /* + * Release any reserved real time extents . Any that were + * allocated will be taken back again by frextents_delta below. + */ + if (tp->t_rtx_res > 0) { + msbp->msb_field = XFS_SBS_FREXTENTS; + msbp->msb_delta = tp->t_rtx_res; + msbp++; + } + + /* + * Apply any superblock modifications to the in-core version. + * The t_res_fdblocks_delta and t_res_frextents_delta fields are + * explicity NOT applied to the in-core superblock. + * The idea is that that has already been done. + */ + if (tp->t_flags & XFS_TRANS_SB_DIRTY) { + if (tp->t_icount_delta != 0) { + msbp->msb_field = XFS_SBS_ICOUNT; + msbp->msb_delta = (int)tp->t_icount_delta; + msbp++; + } + if (tp->t_ifree_delta != 0) { + msbp->msb_field = XFS_SBS_IFREE; + msbp->msb_delta = (int)tp->t_ifree_delta; + msbp++; + } + if (tp->t_fdblocks_delta != 0) { + msbp->msb_field = XFS_SBS_FDBLOCKS; + msbp->msb_delta = (int)tp->t_fdblocks_delta; + msbp++; + } + if (tp->t_frextents_delta != 0) { + msbp->msb_field = XFS_SBS_FREXTENTS; + msbp->msb_delta = (int)tp->t_frextents_delta; + msbp++; + } + if (tp->t_dblocks_delta != 0) { + msbp->msb_field = XFS_SBS_DBLOCKS; + msbp->msb_delta = (int)tp->t_dblocks_delta; + msbp++; + } + if (tp->t_agcount_delta != 0) { + msbp->msb_field = XFS_SBS_AGCOUNT; + msbp->msb_delta = (int)tp->t_agcount_delta; + msbp++; + } + if (tp->t_imaxpct_delta != 0) { + msbp->msb_field = XFS_SBS_IMAX_PCT; + msbp->msb_delta = (int)tp->t_imaxpct_delta; + msbp++; + } + if (tp->t_rextsize_delta != 0) { + msbp->msb_field = XFS_SBS_REXTSIZE; + msbp->msb_delta = (int)tp->t_rextsize_delta; + msbp++; + } + if (tp->t_rbmblocks_delta != 0) { + msbp->msb_field = XFS_SBS_RBMBLOCKS; + msbp->msb_delta = (int)tp->t_rbmblocks_delta; + msbp++; + } + if (tp->t_rblocks_delta != 0) { + msbp->msb_field = XFS_SBS_RBLOCKS; + msbp->msb_delta = (int)tp->t_rblocks_delta; + msbp++; + } + if (tp->t_rextents_delta != 0) { + msbp->msb_field = XFS_SBS_REXTENTS; + msbp->msb_delta = (int)tp->t_rextents_delta; + msbp++; + } + if (tp->t_rextslog_delta != 0) { + msbp->msb_field = XFS_SBS_REXTSLOG; + msbp->msb_delta = (int)tp->t_rextslog_delta; + msbp++; + } + } + + /* + * If we need to change anything, do it. + */ + if (msbp > msb) { + error = xfs_mod_incore_sb_batch(tp->t_mountp, msb, + (uint)(msbp - msb), rsvd); + ASSERT(error == 0); + } +} + + +/* + * xfs_trans_commit + * + * Commit the given transaction to the log a/synchronously. + * + * XFS disk error handling mechanism is not based on a typical + * transaction abort mechanism. Logically after the filesystem + * gets marked 'SHUTDOWN', we can't let any new transactions + * be durable - ie. committed to disk - because some metadata might + * be inconsistent. In such cases, this returns an error, and the + * caller may assume that all locked objects joined to the transaction + * have already been unlocked as if the commit had succeeded. + * Do not reference the transaction structure after this call. + */ + /*ARGSUSED*/ +int +xfs_trans_commit( + xfs_trans_t *tp, + uint flags, + xfs_lsn_t *commit_lsn_p) +{ + xfs_log_iovec_t *log_vector; + int nvec; + xfs_mount_t *mp; + xfs_lsn_t commit_lsn; + /* REFERENCED */ + int error; + int log_flags; + int sync; +#define XFS_TRANS_LOGVEC_COUNT 16 + xfs_log_iovec_t log_vector_fast[XFS_TRANS_LOGVEC_COUNT]; +#if defined(XLOG_NOLOG) || defined(DEBUG) + static xfs_lsn_t trans_lsn = 1; +#endif + void *commit_iclog; + int shutdown; + + commit_lsn = -1; + + /* + * Determine whether this commit is releasing a permanent + * log reservation or not. + */ + if (flags & XFS_TRANS_RELEASE_LOG_RES) { + ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); + log_flags = XFS_LOG_REL_PERM_RESERV; + } else { + log_flags = 0; + } + mp = tp->t_mountp; + + /* + * If there is nothing to be logged by the transaction, + * then unlock all of the items associated with the + * transaction and free the transaction structure. + * Also make sure to return any reserved blocks to + * the free pool. + */ +shut_us_down: + shutdown = XFS_FORCED_SHUTDOWN(mp) ? EIO : 0; + if (!(tp->t_flags & XFS_TRANS_DIRTY) || shutdown) { + xfs_trans_unreserve_and_mod_sb(tp); + /* + * It is indeed possible for the transaction to be + * not dirty but the dqinfo portion to be. All that + * means is that we have some (non-persistent) quota + * reservations that need to be unreserved. + */ + XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(mp, tp); + if (tp->t_ticket) { + commit_lsn = xfs_log_done(mp, tp->t_ticket, + NULL, log_flags); + if (commit_lsn == -1 && !shutdown) + shutdown = XFS_ERROR(EIO); + } + PFLAGS_RESTORE_FSTRANS(&tp->t_pflags); + xfs_trans_free_items(tp, shutdown? XFS_TRANS_ABORT : 0); + xfs_trans_free_busy(tp); + xfs_trans_free(tp); + XFS_STATS_INC(xs_trans_empty); + if (commit_lsn_p) + *commit_lsn_p = commit_lsn; + return (shutdown); + } +#if defined(XLOG_NOLOG) || defined(DEBUG) + ASSERT(!xlog_debug || tp->t_ticket != NULL); +#else + ASSERT(tp->t_ticket != NULL); +#endif + + /* + * If we need to update the superblock, then do it now. + */ + if (tp->t_flags & XFS_TRANS_SB_DIRTY) { + xfs_trans_apply_sb_deltas(tp); + } + XFS_TRANS_APPLY_DQUOT_DELTAS(mp, tp); + + /* + * Ask each log item how many log_vector entries it will + * need so we can figure out how many to allocate. + * Try to avoid the kmem_alloc() call in the common case + * by using a vector from the stack when it fits. + */ + nvec = xfs_trans_count_vecs(tp); + + if (nvec == 0) { + xfs_force_shutdown(mp, XFS_LOG_IO_ERROR); + goto shut_us_down; + } + + + if (nvec <= XFS_TRANS_LOGVEC_COUNT) { + log_vector = log_vector_fast; + } else { + log_vector = (xfs_log_iovec_t *)kmem_alloc(nvec * + sizeof(xfs_log_iovec_t), + KM_SLEEP); + } + + /* + * Fill in the log_vector and pin the logged items, and + * then write the transaction to the log. + */ + xfs_trans_fill_vecs(tp, log_vector); + + /* + * Ignore errors here. xfs_log_done would do the right thing. + * We need to put the ticket, etc. away. + */ + error = xfs_log_write(mp, log_vector, nvec, tp->t_ticket, + &(tp->t_lsn)); + +#if defined(XLOG_NOLOG) || defined(DEBUG) + if (xlog_debug) { + commit_lsn = xfs_log_done(mp, tp->t_ticket, + &commit_iclog, log_flags); + } else { + commit_lsn = 0; + tp->t_lsn = trans_lsn++; + } +#else + /* + * This is the regular case. At this point (after the call finishes), + * the transaction is committed incore and could go out to disk at + * any time. However, all the items associated with the transaction + * are still locked and pinned in memory. + */ + commit_lsn = xfs_log_done(mp, tp->t_ticket, &commit_iclog, log_flags); +#endif + + tp->t_commit_lsn = commit_lsn; + if (nvec > XFS_TRANS_LOGVEC_COUNT) { + kmem_free(log_vector, nvec * sizeof(xfs_log_iovec_t)); + } + + if (commit_lsn_p) + *commit_lsn_p = commit_lsn; + + /* + * If we got a log write error. Unpin the logitems that we + * had pinned, clean up, free trans structure, and return error. + */ + if (error || commit_lsn == -1) { + PFLAGS_RESTORE_FSTRANS(&tp->t_pflags); + xfs_trans_uncommit(tp, flags|XFS_TRANS_ABORT); + return XFS_ERROR(EIO); + } + + /* + * Once the transaction has committed, unused + * reservations need to be released and changes to + * the superblock need to be reflected in the in-core + * version. Do that now. + */ + xfs_trans_unreserve_and_mod_sb(tp); + + sync = tp->t_flags & XFS_TRANS_SYNC; + + /* + * Tell the LM to call the transaction completion routine + * when the log write with LSN commit_lsn completes (e.g. + * when the transaction commit really hits the on-disk log). + * After this call we cannot reference tp, because the call + * can happen at any time and the call will free the transaction + * structure pointed to by tp. The only case where we call + * the completion routine (xfs_trans_committed) directly is + * if the log is turned off on a debug kernel or we're + * running in simulation mode (the log is explicitly turned + * off). + */ + tp->t_logcb.cb_func = (void(*)(void*, int))xfs_trans_committed; + tp->t_logcb.cb_arg = tp; + + /* + * We need to pass the iclog buffer which was used for the + * transaction commit record into this function, and attach + * the callback to it. The callback must be attached before + * the items are unlocked to avoid racing with other threads + * waiting for an item to unlock. + */ + shutdown = xfs_log_notify(mp, commit_iclog, &(tp->t_logcb)); + + /* + * Mark this thread as no longer being in a transaction + */ + PFLAGS_RESTORE_FSTRANS(&tp->t_pflags); + + /* + * Once all the items of the transaction have been copied + * to the in core log and the callback is attached, the + * items can be unlocked. + * + * This will free descriptors pointing to items which were + * not logged since there is nothing more to do with them. + * For items which were logged, we will keep pointers to them + * so they can be unpinned after the transaction commits to disk. + * This will also stamp each modified meta-data item with + * the commit lsn of this transaction for dependency tracking + * purposes. + */ + xfs_trans_unlock_items(tp, commit_lsn); + + /* + * If we detected a log error earlier, finish committing + * the transaction now (unpin log items, etc). + * + * Order is critical here, to avoid using the transaction + * pointer after its been freed (by xfs_trans_committed + * either here now, or as a callback). We cannot do this + * step inside xfs_log_notify as was done earlier because + * of this issue. + */ + if (shutdown) + xfs_trans_committed(tp, XFS_LI_ABORTED); + + /* + * Now that the xfs_trans_committed callback has been attached, + * and the items are released we can finally allow the iclog to + * go to disk. + */ + error = xfs_log_release_iclog(mp, commit_iclog); + + /* + * If the transaction needs to be synchronous, then force the + * log out now and wait for it. + */ + if (sync) { + if (!error) + error = xfs_log_force(mp, commit_lsn, + XFS_LOG_FORCE | XFS_LOG_SYNC); + XFS_STATS_INC(xs_trans_sync); + } else { + XFS_STATS_INC(xs_trans_async); + } + + return (error); +} + + +/* + * Total up the number of log iovecs needed to commit this + * transaction. The transaction itself needs one for the + * transaction header. Ask each dirty item in turn how many + * it needs to get the total. + */ +STATIC uint +xfs_trans_count_vecs( + xfs_trans_t *tp) +{ + int nvecs; + xfs_log_item_desc_t *lidp; + + nvecs = 1; + lidp = xfs_trans_first_item(tp); + ASSERT(lidp != NULL); + + /* In the non-debug case we need to start bailing out if we + * didn't find a log_item here, return zero and let trans_commit + * deal with it. + */ + if (lidp == NULL) + return 0; + + while (lidp != NULL) { + /* + * Skip items which aren't dirty in this transaction. + */ + if (!(lidp->lid_flags & XFS_LID_DIRTY)) { + lidp = xfs_trans_next_item(tp, lidp); + continue; + } + lidp->lid_size = IOP_SIZE(lidp->lid_item); + nvecs += lidp->lid_size; + lidp = xfs_trans_next_item(tp, lidp); + } + + return nvecs; +} + +/* + * Called from the trans_commit code when we notice that + * the filesystem is in the middle of a forced shutdown. + */ +STATIC void +xfs_trans_uncommit( + xfs_trans_t *tp, + uint flags) +{ + xfs_log_item_desc_t *lidp; + + for (lidp = xfs_trans_first_item(tp); + lidp != NULL; + lidp = xfs_trans_next_item(tp, lidp)) { + /* + * Unpin all but those that aren't dirty. + */ + if (lidp->lid_flags & XFS_LID_DIRTY) + IOP_UNPIN_REMOVE(lidp->lid_item, tp); + } + + xfs_trans_unreserve_and_mod_sb(tp); + XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(tp->t_mountp, tp); + + xfs_trans_free_items(tp, flags); + xfs_trans_free_busy(tp); + xfs_trans_free(tp); +} + +/* + * Fill in the vector with pointers to data to be logged + * by this transaction. The transaction header takes + * the first vector, and then each dirty item takes the + * number of vectors it indicated it needed in xfs_trans_count_vecs(). + * + * As each item fills in the entries it needs, also pin the item + * so that it cannot be flushed out until the log write completes. + */ +STATIC void +xfs_trans_fill_vecs( + xfs_trans_t *tp, + xfs_log_iovec_t *log_vector) +{ + xfs_log_item_desc_t *lidp; + xfs_log_iovec_t *vecp; + uint nitems; + + /* + * Skip over the entry for the transaction header, we'll + * fill that in at the end. + */ + vecp = log_vector + 1; /* pointer arithmetic */ + + nitems = 0; + lidp = xfs_trans_first_item(tp); + ASSERT(lidp != NULL); + while (lidp != NULL) { + /* + * Skip items which aren't dirty in this transaction. + */ + if (!(lidp->lid_flags & XFS_LID_DIRTY)) { + lidp = xfs_trans_next_item(tp, lidp); + continue; + } + /* + * The item may be marked dirty but not log anything. + * This can be used to get called when a transaction + * is committed. + */ + if (lidp->lid_size) { + nitems++; + } + IOP_FORMAT(lidp->lid_item, vecp); + vecp += lidp->lid_size; /* pointer arithmetic */ + IOP_PIN(lidp->lid_item); + lidp = xfs_trans_next_item(tp, lidp); + } + + /* + * Now that we've counted the number of items in this + * transaction, fill in the transaction header. + */ + tp->t_header.th_magic = XFS_TRANS_HEADER_MAGIC; + tp->t_header.th_type = tp->t_type; + tp->t_header.th_num_items = nitems; + log_vector->i_addr = (xfs_caddr_t)&tp->t_header; + log_vector->i_len = sizeof(xfs_trans_header_t); +} + + +/* + * Unlock all of the transaction's items and free the transaction. + * The transaction must not have modified any of its items, because + * there is no way to restore them to their previous state. + * + * If the transaction has made a log reservation, make sure to release + * it as well. + */ +void +xfs_trans_cancel( + xfs_trans_t *tp, + int flags) +{ + int log_flags; +#ifdef DEBUG + xfs_log_item_chunk_t *licp; + xfs_log_item_desc_t *lidp; + xfs_log_item_t *lip; + int i; +#endif + + /* + * See if the caller is being too lazy to figure out if + * the transaction really needs an abort. + */ + if ((flags & XFS_TRANS_ABORT) && !(tp->t_flags & XFS_TRANS_DIRTY)) + flags &= ~XFS_TRANS_ABORT; + /* + * See if the caller is relying on us to shut down the + * filesystem. This happens in paths where we detect + * corruption and decide to give up. + */ + if ((tp->t_flags & XFS_TRANS_DIRTY) && + !XFS_FORCED_SHUTDOWN(tp->t_mountp)) + xfs_force_shutdown(tp->t_mountp, XFS_CORRUPT_INCORE); +#ifdef DEBUG + if (!(flags & XFS_TRANS_ABORT)) { + licp = &(tp->t_items); + while (licp != NULL) { + lidp = licp->lic_descs; + for (i = 0; i < licp->lic_unused; i++, lidp++) { + if (XFS_LIC_ISFREE(licp, i)) { + continue; + } + + lip = lidp->lid_item; + if (!XFS_FORCED_SHUTDOWN(tp->t_mountp)) + ASSERT(!(lip->li_type == XFS_LI_EFD)); + } + licp = licp->lic_next; + } + } +#endif + xfs_trans_unreserve_and_mod_sb(tp); + XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(tp->t_mountp, tp); + + if (tp->t_ticket) { + if (flags & XFS_TRANS_RELEASE_LOG_RES) { + ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); + log_flags = XFS_LOG_REL_PERM_RESERV; + } else { + log_flags = 0; + } + xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, log_flags); + } + + /* mark this thread as no longer being in a transaction */ + PFLAGS_RESTORE_FSTRANS(&tp->t_pflags); + + xfs_trans_free_items(tp, flags); + xfs_trans_free_busy(tp); + xfs_trans_free(tp); +} + + +/* + * Free the transaction structure. If there is more clean up + * to do when the structure is freed, add it here. + */ +STATIC void +xfs_trans_free( + xfs_trans_t *tp) +{ + atomic_dec(&tp->t_mountp->m_active_trans); + XFS_TRANS_FREE_DQINFO(tp->t_mountp, tp); + kmem_zone_free(xfs_trans_zone, tp); +} + + +/* + * THIS SHOULD BE REWRITTEN TO USE xfs_trans_next_item(). + * + * This is typically called by the LM when a transaction has been fully + * committed to disk. It needs to unpin the items which have + * been logged by the transaction and update their positions + * in the AIL if necessary. + * This also gets called when the transactions didn't get written out + * because of an I/O error. Abortflag & XFS_LI_ABORTED is set then. + * + * Call xfs_trans_chunk_committed() to process the items in + * each chunk. + */ +STATIC void +xfs_trans_committed( + xfs_trans_t *tp, + int abortflag) +{ + xfs_log_item_chunk_t *licp; + xfs_log_item_chunk_t *next_licp; + xfs_log_busy_chunk_t *lbcp; + xfs_log_busy_slot_t *lbsp; + int i; + + /* + * Call the transaction's completion callback if there + * is one. + */ + if (tp->t_callback != NULL) { + tp->t_callback(tp, tp->t_callarg); + } + + /* + * Special case the chunk embedded in the transaction. + */ + licp = &(tp->t_items); + if (!(XFS_LIC_ARE_ALL_FREE(licp))) { + xfs_trans_chunk_committed(licp, tp->t_lsn, abortflag); + } + + /* + * Process the items in each chunk in turn. + */ + licp = licp->lic_next; + while (licp != NULL) { + ASSERT(!XFS_LIC_ARE_ALL_FREE(licp)); + xfs_trans_chunk_committed(licp, tp->t_lsn, abortflag); + next_licp = licp->lic_next; + kmem_free(licp, sizeof(xfs_log_item_chunk_t)); + licp = next_licp; + } + + /* + * Clear all the per-AG busy list items listed in this transaction + */ + lbcp = &tp->t_busy; + while (lbcp != NULL) { + for (i = 0, lbsp = lbcp->lbc_busy; i < lbcp->lbc_unused; i++, lbsp++) { + if (!XFS_LBC_ISFREE(lbcp, i)) { + xfs_alloc_clear_busy(tp, lbsp->lbc_ag, + lbsp->lbc_idx); + } + } + lbcp = lbcp->lbc_next; + } + xfs_trans_free_busy(tp); + + /* + * That's it for the transaction structure. Free it. + */ + xfs_trans_free(tp); +} + +/* + * This is called to perform the commit processing for each + * item described by the given chunk. + * + * The commit processing consists of unlocking items which were + * held locked with the SYNC_UNLOCK attribute, calling the committed + * routine of each logged item, updating the item's position in the AIL + * if necessary, and unpinning each item. If the committed routine + * returns -1, then do nothing further with the item because it + * may have been freed. + * + * Since items are unlocked when they are copied to the incore + * log, it is possible for two transactions to be completing + * and manipulating the same item simultaneously. The AIL lock + * will protect the lsn field of each item. The value of this + * field can never go backwards. + * + * We unpin the items after repositioning them in the AIL, because + * otherwise they could be immediately flushed and we'd have to race + * with the flusher trying to pull the item from the AIL as we add it. + */ +STATIC void +xfs_trans_chunk_committed( + xfs_log_item_chunk_t *licp, + xfs_lsn_t lsn, + int aborted) +{ + xfs_log_item_desc_t *lidp; + xfs_log_item_t *lip; + xfs_lsn_t item_lsn; + struct xfs_mount *mp; + int i; + SPLDECL(s); + + lidp = licp->lic_descs; + for (i = 0; i < licp->lic_unused; i++, lidp++) { + if (XFS_LIC_ISFREE(licp, i)) { + continue; + } + + lip = lidp->lid_item; + if (aborted) + lip->li_flags |= XFS_LI_ABORTED; + + /* + * Send in the ABORTED flag to the COMMITTED routine + * so that it knows whether the transaction was aborted + * or not. + */ + item_lsn = IOP_COMMITTED(lip, lsn); + + /* + * If the committed routine returns -1, make + * no more references to the item. + */ + if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0) { + continue; + } + + /* + * If the returned lsn is greater than what it + * contained before, update the location of the + * item in the AIL. If it is not, then do nothing. + * Items can never move backwards in the AIL. + * + * While the new lsn should usually be greater, it + * is possible that a later transaction completing + * simultaneously with an earlier one using the + * same item could complete first with a higher lsn. + * This would cause the earlier transaction to fail + * the test below. + */ + mp = lip->li_mountp; + AIL_LOCK(mp,s); + if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0) { + /* + * This will set the item's lsn to item_lsn + * and update the position of the item in + * the AIL. + * + * xfs_trans_update_ail() drops the AIL lock. + */ + xfs_trans_update_ail(mp, lip, item_lsn, s); + } else { + AIL_UNLOCK(mp, s); + } + + /* + * Now that we've repositioned the item in the AIL, + * unpin it so it can be flushed. Pass information + * about buffer stale state down from the log item + * flags, if anyone else stales the buffer we do not + * want to pay any attention to it. + */ + IOP_UNPIN(lip, lidp->lid_flags & XFS_LID_BUF_STALE); + } +} |