diff options
Diffstat (limited to 'fs/xfs/xfs_inode_item.c')
| -rw-r--r-- | fs/xfs/xfs_inode_item.c | 1092 |
1 files changed, 1092 insertions, 0 deletions
diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c new file mode 100644 index 0000000..768cb18 --- /dev/null +++ b/fs/xfs/xfs_inode_item.c @@ -0,0 +1,1092 @@ +/* + * Copyright (c) 2000-2002 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/ + */ + +/* + * This file contains the implementation of the xfs_inode_log_item. + * It contains the item operations used to manipulate the inode log + * items as well as utility routines used by the inode specific + * transaction routines. + */ +#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_buf_item.h" +#include "xfs_sb.h" +#include "xfs_dir.h" +#include "xfs_dir2.h" +#include "xfs_dmapi.h" +#include "xfs_mount.h" +#include "xfs_trans_priv.h" +#include "xfs_ag.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_attr_sf.h" +#include "xfs_dir_sf.h" +#include "xfs_dir2_sf.h" +#include "xfs_dinode.h" +#include "xfs_inode_item.h" +#include "xfs_inode.h" +#include "xfs_rw.h" + + +kmem_zone_t *xfs_ili_zone; /* inode log item zone */ + +/* + * This returns the number of iovecs needed to log the given inode item. + * + * We need one iovec for the inode log format structure, one for the + * inode core, and possibly one for the inode data/extents/b-tree root + * and one for the inode attribute data/extents/b-tree root. + */ +STATIC uint +xfs_inode_item_size( + xfs_inode_log_item_t *iip) +{ + uint nvecs; + xfs_inode_t *ip; + + ip = iip->ili_inode; + nvecs = 2; + + /* + * Only log the data/extents/b-tree root if there is something + * left to log. + */ + iip->ili_format.ilf_fields |= XFS_ILOG_CORE; + + switch (ip->i_d.di_format) { + case XFS_DINODE_FMT_EXTENTS: + iip->ili_format.ilf_fields &= + ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT | + XFS_ILOG_DEV | XFS_ILOG_UUID); + if ((iip->ili_format.ilf_fields & XFS_ILOG_DEXT) && + (ip->i_d.di_nextents > 0) && + (ip->i_df.if_bytes > 0)) { + ASSERT(ip->i_df.if_u1.if_extents != NULL); + nvecs++; + } else { + iip->ili_format.ilf_fields &= ~XFS_ILOG_DEXT; + } + break; + + case XFS_DINODE_FMT_BTREE: + ASSERT(ip->i_df.if_ext_max == + XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t)); + iip->ili_format.ilf_fields &= + ~(XFS_ILOG_DDATA | XFS_ILOG_DEXT | + XFS_ILOG_DEV | XFS_ILOG_UUID); + if ((iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) && + (ip->i_df.if_broot_bytes > 0)) { + ASSERT(ip->i_df.if_broot != NULL); + nvecs++; + } else { + ASSERT(!(iip->ili_format.ilf_fields & + XFS_ILOG_DBROOT)); +#ifdef XFS_TRANS_DEBUG + if (iip->ili_root_size > 0) { + ASSERT(iip->ili_root_size == + ip->i_df.if_broot_bytes); + ASSERT(memcmp(iip->ili_orig_root, + ip->i_df.if_broot, + iip->ili_root_size) == 0); + } else { + ASSERT(ip->i_df.if_broot_bytes == 0); + } +#endif + iip->ili_format.ilf_fields &= ~XFS_ILOG_DBROOT; + } + break; + + case XFS_DINODE_FMT_LOCAL: + iip->ili_format.ilf_fields &= + ~(XFS_ILOG_DEXT | XFS_ILOG_DBROOT | + XFS_ILOG_DEV | XFS_ILOG_UUID); + if ((iip->ili_format.ilf_fields & XFS_ILOG_DDATA) && + (ip->i_df.if_bytes > 0)) { + ASSERT(ip->i_df.if_u1.if_data != NULL); + ASSERT(ip->i_d.di_size > 0); + nvecs++; + } else { + iip->ili_format.ilf_fields &= ~XFS_ILOG_DDATA; + } + break; + + case XFS_DINODE_FMT_DEV: + iip->ili_format.ilf_fields &= + ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT | + XFS_ILOG_DEXT | XFS_ILOG_UUID); + break; + + case XFS_DINODE_FMT_UUID: + iip->ili_format.ilf_fields &= + ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT | + XFS_ILOG_DEXT | XFS_ILOG_DEV); + break; + + default: + ASSERT(0); + break; + } + + /* + * If there are no attributes associated with this file, + * then there cannot be anything more to log. + * Clear all attribute-related log flags. + */ + if (!XFS_IFORK_Q(ip)) { + iip->ili_format.ilf_fields &= + ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT); + return nvecs; + } + + /* + * Log any necessary attribute data. + */ + switch (ip->i_d.di_aformat) { + case XFS_DINODE_FMT_EXTENTS: + iip->ili_format.ilf_fields &= + ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT); + if ((iip->ili_format.ilf_fields & XFS_ILOG_AEXT) && + (ip->i_d.di_anextents > 0) && + (ip->i_afp->if_bytes > 0)) { + ASSERT(ip->i_afp->if_u1.if_extents != NULL); + nvecs++; + } else { + iip->ili_format.ilf_fields &= ~XFS_ILOG_AEXT; + } + break; + + case XFS_DINODE_FMT_BTREE: + iip->ili_format.ilf_fields &= + ~(XFS_ILOG_ADATA | XFS_ILOG_AEXT); + if ((iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) && + (ip->i_afp->if_broot_bytes > 0)) { + ASSERT(ip->i_afp->if_broot != NULL); + nvecs++; + } else { + iip->ili_format.ilf_fields &= ~XFS_ILOG_ABROOT; + } + break; + + case XFS_DINODE_FMT_LOCAL: + iip->ili_format.ilf_fields &= + ~(XFS_ILOG_AEXT | XFS_ILOG_ABROOT); + if ((iip->ili_format.ilf_fields & XFS_ILOG_ADATA) && + (ip->i_afp->if_bytes > 0)) { + ASSERT(ip->i_afp->if_u1.if_data != NULL); + nvecs++; + } else { + iip->ili_format.ilf_fields &= ~XFS_ILOG_ADATA; + } + break; + + default: + ASSERT(0); + break; + } + + return nvecs; +} + +/* + * This is called to fill in the vector of log iovecs for the + * given inode log item. It fills the first item with an inode + * log format structure, the second with the on-disk inode structure, + * and a possible third and/or fourth with the inode data/extents/b-tree + * root and inode attributes data/extents/b-tree root. + */ +STATIC void +xfs_inode_item_format( + xfs_inode_log_item_t *iip, + xfs_log_iovec_t *log_vector) +{ + uint nvecs; + xfs_log_iovec_t *vecp; + xfs_inode_t *ip; + size_t data_bytes; + xfs_bmbt_rec_t *ext_buffer; + int nrecs; + xfs_mount_t *mp; + + ip = iip->ili_inode; + vecp = log_vector; + + vecp->i_addr = (xfs_caddr_t)&iip->ili_format; + vecp->i_len = sizeof(xfs_inode_log_format_t); + vecp++; + nvecs = 1; + + /* + * Clear i_update_core if the timestamps (or any other + * non-transactional modification) need flushing/logging + * and we're about to log them with the rest of the core. + * + * This is the same logic as xfs_iflush() but this code can't + * run at the same time as xfs_iflush because we're in commit + * processing here and so we have the inode lock held in + * exclusive mode. Although it doesn't really matter + * for the timestamps if both routines were to grab the + * timestamps or not. That would be ok. + * + * We clear i_update_core before copying out the data. + * This is for coordination with our timestamp updates + * that don't hold the inode lock. They will always + * update the timestamps BEFORE setting i_update_core, + * so if we clear i_update_core after they set it we + * are guaranteed to see their updates to the timestamps + * either here. Likewise, if they set it after we clear it + * here, we'll see it either on the next commit of this + * inode or the next time the inode gets flushed via + * xfs_iflush(). This depends on strongly ordered memory + * semantics, but we have that. We use the SYNCHRONIZE + * macro to make sure that the compiler does not reorder + * the i_update_core access below the data copy below. + */ + if (ip->i_update_core) { + ip->i_update_core = 0; + SYNCHRONIZE(); + } + + /* + * We don't have to worry about re-ordering here because + * the update_size field is protected by the inode lock + * and we have that held in exclusive mode. + */ + if (ip->i_update_size) + ip->i_update_size = 0; + + vecp->i_addr = (xfs_caddr_t)&ip->i_d; + vecp->i_len = sizeof(xfs_dinode_core_t); + vecp++; + nvecs++; + iip->ili_format.ilf_fields |= XFS_ILOG_CORE; + + /* + * If this is really an old format inode, then we need to + * log it as such. This means that we have to copy the link + * count from the new field to the old. We don't have to worry + * about the new fields, because nothing trusts them as long as + * the old inode version number is there. If the superblock already + * has a new version number, then we don't bother converting back. + */ + mp = ip->i_mount; + ASSERT(ip->i_d.di_version == XFS_DINODE_VERSION_1 || + XFS_SB_VERSION_HASNLINK(&mp->m_sb)); + if (ip->i_d.di_version == XFS_DINODE_VERSION_1) { + if (!XFS_SB_VERSION_HASNLINK(&mp->m_sb)) { + /* + * Convert it back. + */ + ASSERT(ip->i_d.di_nlink <= XFS_MAXLINK_1); + ip->i_d.di_onlink = ip->i_d.di_nlink; + } else { + /* + * The superblock version has already been bumped, + * so just make the conversion to the new inode + * format permanent. + */ + ip->i_d.di_version = XFS_DINODE_VERSION_2; + ip->i_d.di_onlink = 0; + memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad)); + } + } + + switch (ip->i_d.di_format) { + case XFS_DINODE_FMT_EXTENTS: + ASSERT(!(iip->ili_format.ilf_fields & + (XFS_ILOG_DDATA | XFS_ILOG_DBROOT | + XFS_ILOG_DEV | XFS_ILOG_UUID))); + if (iip->ili_format.ilf_fields & XFS_ILOG_DEXT) { + ASSERT(ip->i_df.if_bytes > 0); + ASSERT(ip->i_df.if_u1.if_extents != NULL); + ASSERT(ip->i_d.di_nextents > 0); + ASSERT(iip->ili_extents_buf == NULL); + nrecs = ip->i_df.if_bytes / + (uint)sizeof(xfs_bmbt_rec_t); + ASSERT(nrecs > 0); +#if __BYTE_ORDER == __BIG_ENDIAN + if (nrecs == ip->i_d.di_nextents) { + /* + * There are no delayed allocation + * extents, so just point to the + * real extents array. + */ + vecp->i_addr = + (char *)(ip->i_df.if_u1.if_extents); + vecp->i_len = ip->i_df.if_bytes; + } else +#endif + { + /* + * There are delayed allocation extents + * in the inode, or we need to convert + * the extents to on disk format. + * Use xfs_iextents_copy() + * to copy only the real extents into + * a separate buffer. We'll free the + * buffer in the unlock routine. + */ + ext_buffer = kmem_alloc(ip->i_df.if_bytes, + KM_SLEEP); + iip->ili_extents_buf = ext_buffer; + vecp->i_addr = (xfs_caddr_t)ext_buffer; + vecp->i_len = xfs_iextents_copy(ip, ext_buffer, + XFS_DATA_FORK); + } + ASSERT(vecp->i_len <= ip->i_df.if_bytes); + iip->ili_format.ilf_dsize = vecp->i_len; + vecp++; + nvecs++; + } + break; + + case XFS_DINODE_FMT_BTREE: + ASSERT(!(iip->ili_format.ilf_fields & + (XFS_ILOG_DDATA | XFS_ILOG_DEXT | + XFS_ILOG_DEV | XFS_ILOG_UUID))); + if (iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) { + ASSERT(ip->i_df.if_broot_bytes > 0); + ASSERT(ip->i_df.if_broot != NULL); + vecp->i_addr = (xfs_caddr_t)ip->i_df.if_broot; + vecp->i_len = ip->i_df.if_broot_bytes; + vecp++; + nvecs++; + iip->ili_format.ilf_dsize = ip->i_df.if_broot_bytes; + } + break; + + case XFS_DINODE_FMT_LOCAL: + ASSERT(!(iip->ili_format.ilf_fields & + (XFS_ILOG_DBROOT | XFS_ILOG_DEXT | + XFS_ILOG_DEV | XFS_ILOG_UUID))); + if (iip->ili_format.ilf_fields & XFS_ILOG_DDATA) { + ASSERT(ip->i_df.if_bytes > 0); + ASSERT(ip->i_df.if_u1.if_data != NULL); + ASSERT(ip->i_d.di_size > 0); + + vecp->i_addr = (xfs_caddr_t)ip->i_df.if_u1.if_data; + /* + * Round i_bytes up to a word boundary. + * The underlying memory is guaranteed to + * to be there by xfs_idata_realloc(). + */ + data_bytes = roundup(ip->i_df.if_bytes, 4); + ASSERT((ip->i_df.if_real_bytes == 0) || + (ip->i_df.if_real_bytes == data_bytes)); + vecp->i_len = (int)data_bytes; + vecp++; + nvecs++; + iip->ili_format.ilf_dsize = (unsigned)data_bytes; + } + break; + + case XFS_DINODE_FMT_DEV: + ASSERT(!(iip->ili_format.ilf_fields & + (XFS_ILOG_DBROOT | XFS_ILOG_DEXT | + XFS_ILOG_DDATA | XFS_ILOG_UUID))); + if (iip->ili_format.ilf_fields & XFS_ILOG_DEV) { + iip->ili_format.ilf_u.ilfu_rdev = + ip->i_df.if_u2.if_rdev; + } + break; + + case XFS_DINODE_FMT_UUID: + ASSERT(!(iip->ili_format.ilf_fields & + (XFS_ILOG_DBROOT | XFS_ILOG_DEXT | + XFS_ILOG_DDATA | XFS_ILOG_DEV))); + if (iip->ili_format.ilf_fields & XFS_ILOG_UUID) { + iip->ili_format.ilf_u.ilfu_uuid = + ip->i_df.if_u2.if_uuid; + } + break; + + default: + ASSERT(0); + break; + } + + /* + * If there are no attributes associated with the file, + * then we're done. + * Assert that no attribute-related log flags are set. + */ + if (!XFS_IFORK_Q(ip)) { + ASSERT(nvecs == iip->ili_item.li_desc->lid_size); + iip->ili_format.ilf_size = nvecs; + ASSERT(!(iip->ili_format.ilf_fields & + (XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT))); + return; + } + + switch (ip->i_d.di_aformat) { + case XFS_DINODE_FMT_EXTENTS: + ASSERT(!(iip->ili_format.ilf_fields & + (XFS_ILOG_ADATA | XFS_ILOG_ABROOT))); + if (iip->ili_format.ilf_fields & XFS_ILOG_AEXT) { + ASSERT(ip->i_afp->if_bytes > 0); + ASSERT(ip->i_afp->if_u1.if_extents != NULL); + ASSERT(ip->i_d.di_anextents > 0); +#ifdef DEBUG + nrecs = ip->i_afp->if_bytes / + (uint)sizeof(xfs_bmbt_rec_t); +#endif + ASSERT(nrecs > 0); + ASSERT(nrecs == ip->i_d.di_anextents); +#if __BYTE_ORDER == __BIG_ENDIAN + /* + * There are not delayed allocation extents + * for attributes, so just point at the array. + */ + vecp->i_addr = (char *)(ip->i_afp->if_u1.if_extents); + vecp->i_len = ip->i_afp->if_bytes; +#else + ASSERT(iip->ili_aextents_buf == NULL); + /* + * Need to endian flip before logging + */ + ext_buffer = kmem_alloc(ip->i_afp->if_bytes, + KM_SLEEP); + iip->ili_aextents_buf = ext_buffer; + vecp->i_addr = (xfs_caddr_t)ext_buffer; + vecp->i_len = xfs_iextents_copy(ip, ext_buffer, + XFS_ATTR_FORK); +#endif + iip->ili_format.ilf_asize = vecp->i_len; + vecp++; + nvecs++; + } + break; + + case XFS_DINODE_FMT_BTREE: + ASSERT(!(iip->ili_format.ilf_fields & + (XFS_ILOG_ADATA | XFS_ILOG_AEXT))); + if (iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) { + ASSERT(ip->i_afp->if_broot_bytes > 0); + ASSERT(ip->i_afp->if_broot != NULL); + vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_broot; + vecp->i_len = ip->i_afp->if_broot_bytes; + vecp++; + nvecs++; + iip->ili_format.ilf_asize = ip->i_afp->if_broot_bytes; + } + break; + + case XFS_DINODE_FMT_LOCAL: + ASSERT(!(iip->ili_format.ilf_fields & + (XFS_ILOG_ABROOT | XFS_ILOG_AEXT))); + if (iip->ili_format.ilf_fields & XFS_ILOG_ADATA) { + ASSERT(ip->i_afp->if_bytes > 0); + ASSERT(ip->i_afp->if_u1.if_data != NULL); + + vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_u1.if_data; + /* + * Round i_bytes up to a word boundary. + * The underlying memory is guaranteed to + * to be there by xfs_idata_realloc(). + */ + data_bytes = roundup(ip->i_afp->if_bytes, 4); + ASSERT((ip->i_afp->if_real_bytes == 0) || + (ip->i_afp->if_real_bytes == data_bytes)); + vecp->i_len = (int)data_bytes; + vecp++; + nvecs++; + iip->ili_format.ilf_asize = (unsigned)data_bytes; + } + break; + + default: + ASSERT(0); + break; + } + + ASSERT(nvecs == iip->ili_item.li_desc->lid_size); + iip->ili_format.ilf_size = nvecs; +} + + +/* + * This is called to pin the inode associated with the inode log + * item in memory so it cannot be written out. Do this by calling + * xfs_ipin() to bump the pin count in the inode while holding the + * inode pin lock. + */ +STATIC void +xfs_inode_item_pin( + xfs_inode_log_item_t *iip) +{ + ASSERT(ismrlocked(&(iip->ili_inode->i_lock), MR_UPDATE)); + xfs_ipin(iip->ili_inode); +} + + +/* + * This is called to unpin the inode associated with the inode log + * item which was previously pinned with a call to xfs_inode_item_pin(). + * Just call xfs_iunpin() on the inode to do this. + */ +/* ARGSUSED */ +STATIC void +xfs_inode_item_unpin( + xfs_inode_log_item_t *iip, + int stale) +{ + xfs_iunpin(iip->ili_inode); +} + +/* ARGSUSED */ +STATIC void +xfs_inode_item_unpin_remove( + xfs_inode_log_item_t *iip, + xfs_trans_t *tp) +{ + xfs_iunpin(iip->ili_inode); +} + +/* + * This is called to attempt to lock the inode associated with this + * inode log item, in preparation for the push routine which does the actual + * iflush. Don't sleep on the inode lock or the flush lock. + * + * If the flush lock is already held, indicating that the inode has + * been or is in the process of being flushed, then (ideally) we'd like to + * see if the inode's buffer is still incore, and if so give it a nudge. + * We delay doing so until the pushbuf routine, though, to avoid holding + * the AIL lock across a call to the blackhole which is the buffercache. + * Also we don't want to sleep in any device strategy routines, which can happen + * if we do the subsequent bawrite in here. + */ +STATIC uint +xfs_inode_item_trylock( + xfs_inode_log_item_t *iip) +{ + register xfs_inode_t *ip; + + ip = iip->ili_inode; + + if (xfs_ipincount(ip) > 0) { + return XFS_ITEM_PINNED; + } + + if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) { + return XFS_ITEM_LOCKED; + } + + if (!xfs_iflock_nowait(ip)) { + /* + * If someone else isn't already trying to push the inode + * buffer, we get to do it. + */ + if (iip->ili_pushbuf_flag == 0) { + iip->ili_pushbuf_flag = 1; +#ifdef DEBUG + iip->ili_push_owner = get_thread_id(); +#endif + /* + * Inode is left locked in shared mode. + * Pushbuf routine gets to unlock it. + */ + return XFS_ITEM_PUSHBUF; + } else { + /* + * We hold the AIL_LOCK, so we must specify the + * NONOTIFY flag so that we won't double trip. + */ + xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY); + return XFS_ITEM_FLUSHING; + } + /* NOTREACHED */ + } + + /* Stale items should force out the iclog */ + if (ip->i_flags & XFS_ISTALE) { + xfs_ifunlock(ip); + xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY); + return XFS_ITEM_PINNED; + } + +#ifdef DEBUG + if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { + ASSERT(iip->ili_format.ilf_fields != 0); + ASSERT(iip->ili_logged == 0); + ASSERT(iip->ili_item.li_flags & XFS_LI_IN_AIL); + } +#endif + return XFS_ITEM_SUCCESS; +} + +/* + * Unlock the inode associated with the inode log item. + * Clear the fields of the inode and inode log item that + * are specific to the current transaction. If the + * hold flags is set, do not unlock the inode. + */ +STATIC void +xfs_inode_item_unlock( + xfs_inode_log_item_t *iip) +{ + uint hold; + uint iolocked; + uint lock_flags; + xfs_inode_t *ip; + + ASSERT(iip != NULL); + ASSERT(iip->ili_inode->i_itemp != NULL); + ASSERT(ismrlocked(&(iip->ili_inode->i_lock), MR_UPDATE)); + ASSERT((!(iip->ili_inode->i_itemp->ili_flags & + XFS_ILI_IOLOCKED_EXCL)) || + ismrlocked(&(iip->ili_inode->i_iolock), MR_UPDATE)); + ASSERT((!(iip->ili_inode->i_itemp->ili_flags & + XFS_ILI_IOLOCKED_SHARED)) || + ismrlocked(&(iip->ili_inode->i_iolock), MR_ACCESS)); + /* + * Clear the transaction pointer in the inode. + */ + ip = iip->ili_inode; + ip->i_transp = NULL; + + /* + * If the inode needed a separate buffer with which to log + * its extents, then free it now. + */ + if (iip->ili_extents_buf != NULL) { + ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS); + ASSERT(ip->i_d.di_nextents > 0); + ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_DEXT); + ASSERT(ip->i_df.if_bytes > 0); + kmem_free(iip->ili_extents_buf, ip->i_df.if_bytes); + iip->ili_extents_buf = NULL; + } + if (iip->ili_aextents_buf != NULL) { + ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS); + ASSERT(ip->i_d.di_anextents > 0); + ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_AEXT); + ASSERT(ip->i_afp->if_bytes > 0); + kmem_free(iip->ili_aextents_buf, ip->i_afp->if_bytes); + iip->ili_aextents_buf = NULL; + } + + /* + * Figure out if we should unlock the inode or not. + */ + hold = iip->ili_flags & XFS_ILI_HOLD; + + /* + * Before clearing out the flags, remember whether we + * are holding the inode's IO lock. + */ + iolocked = iip->ili_flags & XFS_ILI_IOLOCKED_ANY; + + /* + * Clear out the fields of the inode log item particular + * to the current transaction. + */ + iip->ili_ilock_recur = 0; + iip->ili_iolock_recur = 0; + iip->ili_flags = 0; + + /* + * Unlock the inode if XFS_ILI_HOLD was not set. + */ + if (!hold) { + lock_flags = XFS_ILOCK_EXCL; + if (iolocked & XFS_ILI_IOLOCKED_EXCL) { + lock_flags |= XFS_IOLOCK_EXCL; + } else if (iolocked & XFS_ILI_IOLOCKED_SHARED) { + lock_flags |= XFS_IOLOCK_SHARED; + } + xfs_iput(iip->ili_inode, lock_flags); + } +} + +/* + * This is called to find out where the oldest active copy of the + * inode log item in the on disk log resides now that the last log + * write of it completed at the given lsn. Since we always re-log + * all dirty data in an inode, the latest copy in the on disk log + * is the only one that matters. Therefore, simply return the + * given lsn. + */ +/*ARGSUSED*/ +STATIC xfs_lsn_t +xfs_inode_item_committed( + xfs_inode_log_item_t *iip, + xfs_lsn_t lsn) +{ + return (lsn); +} + +/* + * The transaction with the inode locked has aborted. The inode + * must not be dirty within the transaction (unless we're forcibly + * shutting down). We simply unlock just as if the transaction + * had been cancelled. + */ +STATIC void +xfs_inode_item_abort( + xfs_inode_log_item_t *iip) +{ + xfs_inode_item_unlock(iip); + return; +} + + +/* + * This gets called by xfs_trans_push_ail(), when IOP_TRYLOCK + * failed to get the inode flush lock but did get the inode locked SHARED. + * Here we're trying to see if the inode buffer is incore, and if so whether it's + * marked delayed write. If that's the case, we'll initiate a bawrite on that + * buffer to expedite the process. + * + * We aren't holding the AIL_LOCK (or the flush lock) when this gets called, + * so it is inherently race-y. + */ +STATIC void +xfs_inode_item_pushbuf( + xfs_inode_log_item_t *iip) +{ + xfs_inode_t *ip; + xfs_mount_t *mp; + xfs_buf_t *bp; + uint dopush; + + ip = iip->ili_inode; + + ASSERT(ismrlocked(&(ip->i_lock), MR_ACCESS)); + + /* + * The ili_pushbuf_flag keeps others from + * trying to duplicate our effort. + */ + ASSERT(iip->ili_pushbuf_flag != 0); + ASSERT(iip->ili_push_owner == get_thread_id()); + + /* + * If flushlock isn't locked anymore, chances are that the + * inode flush completed and the inode was taken off the AIL. + * So, just get out. + */ + if ((valusema(&(ip->i_flock)) > 0) || + ((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0)) { + iip->ili_pushbuf_flag = 0; + xfs_iunlock(ip, XFS_ILOCK_SHARED); + return; + } + + mp = ip->i_mount; + bp = xfs_incore(mp->m_ddev_targp, iip->ili_format.ilf_blkno, + iip->ili_format.ilf_len, XFS_INCORE_TRYLOCK); + + if (bp != NULL) { + if (XFS_BUF_ISDELAYWRITE(bp)) { + /* + * We were racing with iflush because we don't hold + * the AIL_LOCK or the flush lock. However, at this point, + * we have the buffer, and we know that it's dirty. + * So, it's possible that iflush raced with us, and + * this item is already taken off the AIL. + * If not, we can flush it async. + */ + dopush = ((iip->ili_item.li_flags & XFS_LI_IN_AIL) && + (valusema(&(ip->i_flock)) <= 0)); + iip->ili_pushbuf_flag = 0; + xfs_iunlock(ip, XFS_ILOCK_SHARED); + xfs_buftrace("INODE ITEM PUSH", bp); + if (XFS_BUF_ISPINNED(bp)) { + xfs_log_force(mp, (xfs_lsn_t)0, + XFS_LOG_FORCE); + } + if (dopush) { + xfs_bawrite(mp, bp); + } else { + xfs_buf_relse(bp); + } + } else { + iip->ili_pushbuf_flag = 0; + xfs_iunlock(ip, XFS_ILOCK_SHARED); + xfs_buf_relse(bp); + } + return; + } + /* + * We have to be careful about resetting pushbuf flag too early (above). + * Even though in theory we can do it as soon as we have the buflock, + * we don't want others to be doing work needlessly. They'll come to + * this function thinking that pushing the buffer is their + * responsibility only to find that the buffer is still locked by + * another doing the same thing + */ + iip->ili_pushbuf_flag = 0; + xfs_iunlock(ip, XFS_ILOCK_SHARED); + return; +} + + +/* + * This is called to asynchronously write the inode associated with this + * inode log item out to disk. The inode will already have been locked by + * a successful call to xfs_inode_item_trylock(). + */ +STATIC void +xfs_inode_item_push( + xfs_inode_log_item_t *iip) +{ + xfs_inode_t *ip; + + ip = iip->ili_inode; + + ASSERT(ismrlocked(&(ip->i_lock), MR_ACCESS)); + ASSERT(valusema(&(ip->i_flock)) <= 0); + /* + * Since we were able to lock the inode's flush lock and + * we found it on the AIL, the inode must be dirty. This + * is because the inode is removed from the AIL while still + * holding the flush lock in xfs_iflush_done(). Thus, if + * we found it in the AIL and were able to obtain the flush + * lock without sleeping, then there must not have been + * anyone in the process of flushing the inode. + */ + ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || + iip->ili_format.ilf_fields != 0); + + /* + * Write out the inode. The completion routine ('iflush_done') will + * pull it from the AIL, mark it clean, unlock the flush lock. + */ + (void) xfs_iflush(ip, XFS_IFLUSH_ASYNC); + xfs_iunlock(ip, XFS_ILOCK_SHARED); + + return; +} + +/* + * XXX rcc - this one really has to do something. Probably needs + * to stamp in a new field in the incore inode. + */ +/* ARGSUSED */ +STATIC void +xfs_inode_item_committing( + xfs_inode_log_item_t *iip, + xfs_lsn_t lsn) +{ + iip->ili_last_lsn = lsn; + return; +} + +/* + * This is the ops vector shared by all buf log items. + */ +struct xfs_item_ops xfs_inode_item_ops = { + .iop_size = (uint(*)(xfs_log_item_t*))xfs_inode_item_size, + .iop_format = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*)) + xfs_inode_item_format, + .iop_pin = (void(*)(xfs_log_item_t*))xfs_inode_item_pin, + .iop_unpin = (void(*)(xfs_log_item_t*, int))xfs_inode_item_unpin, + .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*)) + xfs_inode_item_unpin_remove, + .iop_trylock = (uint(*)(xfs_log_item_t*))xfs_inode_item_trylock, + .iop_unlock = (void(*)(xfs_log_item_t*))xfs_inode_item_unlock, + .iop_committed = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t)) + xfs_inode_item_committed, + .iop_push = (void(*)(xfs_log_item_t*))xfs_inode_item_push, + .iop_abort = (void(*)(xfs_log_item_t*))xfs_inode_item_abort, + .iop_pushbuf = (void(*)(xfs_log_item_t*))xfs_inode_item_pushbuf, + .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t)) + xfs_inode_item_committing +}; + + +/* + * Initialize the inode log item for a newly allocated (in-core) inode. + */ +void +xfs_inode_item_init( + xfs_inode_t *ip, + xfs_mount_t *mp) +{ + xfs_inode_log_item_t *iip; + + ASSERT(ip->i_itemp == NULL); + iip = ip->i_itemp = kmem_zone_zalloc(xfs_ili_zone, KM_SLEEP); + + iip->ili_item.li_type = XFS_LI_INODE; + iip->ili_item.li_ops = &xfs_inode_item_ops; + iip->ili_item.li_mountp = mp; + iip->ili_inode = ip; + + /* + We have zeroed memory. No need ... + iip->ili_extents_buf = NULL; + iip->ili_pushbuf_flag = 0; + */ + + iip->ili_format.ilf_type = XFS_LI_INODE; + iip->ili_format.ilf_ino = ip->i_ino; + iip->ili_format.ilf_blkno = ip->i_blkno; + iip->ili_format.ilf_len = ip->i_len; + iip->ili_format.ilf_boffset = ip->i_boffset; +} + +/* + * Free the inode log item and any memory hanging off of it. + */ +void +xfs_inode_item_destroy( + xfs_inode_t *ip) +{ +#ifdef XFS_TRANS_DEBUG + if (ip->i_itemp->ili_root_size != 0) { + kmem_free(ip->i_itemp->ili_orig_root, + ip->i_itemp->ili_root_size); + } +#endif + kmem_zone_free(xfs_ili_zone, ip->i_itemp); +} + + +/* + * This is the inode flushing I/O completion routine. It is called + * from interrupt level when the buffer containing the inode is + * flushed to disk. It is responsible for removing the inode item + * from the AIL if it has not been re-logged, and unlocking the inode's + * flush lock. + */ +/*ARGSUSED*/ +void +xfs_iflush_done( + xfs_buf_t *bp, + xfs_inode_log_item_t *iip) +{ + xfs_inode_t *ip; + SPLDECL(s); + + ip = iip->ili_inode; + + /* + * We only want to pull the item from the AIL if it is + * actually there and its location in the log has not + * changed since we started the flush. Thus, we only bother + * if the ili_logged flag is set and the inode's lsn has not + * changed. First we check the lsn outside + * the lock since it's cheaper, and then we recheck while + * holding the lock before removing the inode from the AIL. + */ + if (iip->ili_logged && + (iip->ili_item.li_lsn == iip->ili_flush_lsn)) { + AIL_LOCK(ip->i_mount, s); + if (iip->ili_item.li_lsn == iip->ili_flush_lsn) { + /* + * xfs_trans_delete_ail() drops the AIL lock. + */ + xfs_trans_delete_ail(ip->i_mount, + (xfs_log_item_t*)iip, s); + } else { + AIL_UNLOCK(ip->i_mount, s); + } + } + + iip->ili_logged = 0; + + /* + * Clear the ili_last_fields bits now that we know that the + * data corresponding to them is safely on disk. + */ + iip->ili_last_fields = 0; + + /* + * Release the inode's flush lock since we're done with it. + */ + xfs_ifunlock(ip); + + return; +} + +/* + * This is the inode flushing abort routine. It is called + * from xfs_iflush when the filesystem is shutting down to clean + * up the inode state. + * It is responsible for removing the inode item + * from the AIL if it has not been re-logged, and unlocking the inode's + * flush lock. + */ +void +xfs_iflush_abort( + xfs_inode_t *ip) +{ + xfs_inode_log_item_t *iip; + xfs_mount_t *mp; + SPLDECL(s); + + iip = ip->i_itemp; + mp = ip->i_mount; + if (iip) { + if (iip->ili_item.li_flags & XFS_LI_IN_AIL) { + AIL_LOCK(mp, s); + if (iip->ili_item.li_flags & XFS_LI_IN_AIL) { + /* + * xfs_trans_delete_ail() drops the AIL lock. + */ + xfs_trans_delete_ail(mp, (xfs_log_item_t *)iip, + s); + } else + AIL_UNLOCK(mp, s); + } + iip->ili_logged = 0; + /* + * Clear the ili_last_fields bits now that we know that the + * data corresponding to them is safely on disk. + */ + iip->ili_last_fields = 0; + /* + * Clear the inode logging fields so no more flushes are + * attempted. + */ + iip->ili_format.ilf_fields = 0; + } + /* + * Release the inode's flush lock since we're done with it. + */ + xfs_ifunlock(ip); +} + +void +xfs_istale_done( + xfs_buf_t *bp, + xfs_inode_log_item_t *iip) +{ + xfs_iflush_abort(iip->ili_inode); +} |
