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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/xfs/xfs_trans_inode.c | |
download | lwn-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz lwn-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/xfs/xfs_trans_inode.c')
-rw-r--r-- | fs/xfs/xfs_trans_inode.c | 342 |
1 files changed, 342 insertions, 0 deletions
diff --git a/fs/xfs/xfs_trans_inode.c b/fs/xfs/xfs_trans_inode.c new file mode 100644 index 000000000000..e2c3706f453d --- /dev/null +++ b/fs/xfs/xfs_trans_inode.c @@ -0,0 +1,342 @@ +/* + * Copyright (c) 2000 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_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_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" + +#ifdef XFS_TRANS_DEBUG +STATIC void +xfs_trans_inode_broot_debug( + xfs_inode_t *ip); +#else +#define xfs_trans_inode_broot_debug(ip) +#endif + + +/* + * Get and lock the inode for the caller if it is not already + * locked within the given transaction. If it is already locked + * within the transaction, just increment its lock recursion count + * and return a pointer to it. + * + * For an inode to be locked in a transaction, the inode lock, as + * opposed to the io lock, must be taken exclusively. This ensures + * that the inode can be involved in only 1 transaction at a time. + * Lock recursion is handled on the io lock, but only for lock modes + * of equal or lesser strength. That is, you can recur on the io lock + * held EXCL with a SHARED request but not vice versa. Also, if + * the inode is already a part of the transaction then you cannot + * go from not holding the io lock to having it EXCL or SHARED. + * + * Use the inode cache routine xfs_inode_incore() to find the inode + * if it is already owned by this transaction. + * + * If we don't already own the inode, use xfs_iget() to get it. + * Since the inode log item structure is embedded in the incore + * inode structure and is initialized when the inode is brought + * into memory, there is nothing to do with it here. + * + * If the given transaction pointer is NULL, just call xfs_iget(). + * This simplifies code which must handle both cases. + */ +int +xfs_trans_iget( + xfs_mount_t *mp, + xfs_trans_t *tp, + xfs_ino_t ino, + uint flags, + uint lock_flags, + xfs_inode_t **ipp) +{ + int error; + xfs_inode_t *ip; + xfs_inode_log_item_t *iip; + + /* + * If the transaction pointer is NULL, just call the normal + * xfs_iget(). + */ + if (tp == NULL) + return xfs_iget(mp, NULL, ino, flags, lock_flags, ipp, 0); + + /* + * If we find the inode in core with this transaction + * pointer in its i_transp field, then we know we already + * have it locked. In this case we just increment the lock + * recursion count and return the inode to the caller. + * Assert that the inode is already locked in the mode requested + * by the caller. We cannot do lock promotions yet, so + * die if someone gets this wrong. + */ + if ((ip = xfs_inode_incore(tp->t_mountp, ino, tp)) != NULL) { + /* + * Make sure that the inode lock is held EXCL and + * that the io lock is never upgraded when the inode + * is already a part of the transaction. + */ + ASSERT(ip->i_itemp != NULL); + ASSERT(lock_flags & XFS_ILOCK_EXCL); + ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE)); + ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) || + ismrlocked(&ip->i_iolock, MR_UPDATE)); + ASSERT((!(lock_flags & XFS_IOLOCK_EXCL)) || + (ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_EXCL)); + ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) || + ismrlocked(&ip->i_iolock, (MR_UPDATE | MR_ACCESS))); + ASSERT((!(lock_flags & XFS_IOLOCK_SHARED)) || + (ip->i_itemp->ili_flags & XFS_ILI_IOLOCKED_ANY)); + + if (lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) { + ip->i_itemp->ili_iolock_recur++; + } + if (lock_flags & XFS_ILOCK_EXCL) { + ip->i_itemp->ili_ilock_recur++; + } + *ipp = ip; + return 0; + } + + ASSERT(lock_flags & XFS_ILOCK_EXCL); + error = xfs_iget(tp->t_mountp, tp, ino, flags, lock_flags, &ip, 0); + if (error) { + return error; + } + ASSERT(ip != NULL); + + /* + * Get a log_item_desc to point at the new item. + */ + if (ip->i_itemp == NULL) + xfs_inode_item_init(ip, mp); + iip = ip->i_itemp; + (void) xfs_trans_add_item(tp, (xfs_log_item_t *)(iip)); + + xfs_trans_inode_broot_debug(ip); + + /* + * If the IO lock has been acquired, mark that in + * the inode log item so we'll know to unlock it + * when the transaction commits. + */ + ASSERT(iip->ili_flags == 0); + if (lock_flags & XFS_IOLOCK_EXCL) { + iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL; + } else if (lock_flags & XFS_IOLOCK_SHARED) { + iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED; + } + + /* + * Initialize i_transp so we can find it with xfs_inode_incore() + * above. + */ + ip->i_transp = tp; + + *ipp = ip; + return 0; +} + +/* + * Add the locked inode to the transaction. + * The inode must be locked, and it cannot be associated with any + * transaction. The caller must specify the locks already held + * on the inode. + */ +void +xfs_trans_ijoin( + xfs_trans_t *tp, + xfs_inode_t *ip, + uint lock_flags) +{ + xfs_inode_log_item_t *iip; + + ASSERT(ip->i_transp == NULL); + ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE)); + ASSERT(lock_flags & XFS_ILOCK_EXCL); + if (ip->i_itemp == NULL) + xfs_inode_item_init(ip, ip->i_mount); + iip = ip->i_itemp; + ASSERT(iip->ili_flags == 0); + ASSERT(iip->ili_ilock_recur == 0); + ASSERT(iip->ili_iolock_recur == 0); + + /* + * Get a log_item_desc to point at the new item. + */ + (void) xfs_trans_add_item(tp, (xfs_log_item_t*)(iip)); + + xfs_trans_inode_broot_debug(ip); + + /* + * If the IO lock is already held, mark that in the inode log item. + */ + if (lock_flags & XFS_IOLOCK_EXCL) { + iip->ili_flags |= XFS_ILI_IOLOCKED_EXCL; + } else if (lock_flags & XFS_IOLOCK_SHARED) { + iip->ili_flags |= XFS_ILI_IOLOCKED_SHARED; + } + + /* + * Initialize i_transp so we can find it with xfs_inode_incore() + * in xfs_trans_iget() above. + */ + ip->i_transp = tp; +} + + + +/* + * Mark the inode as not needing to be unlocked when the inode item's + * IOP_UNLOCK() routine is called. The inode must already be locked + * and associated with the given transaction. + */ +/*ARGSUSED*/ +void +xfs_trans_ihold( + xfs_trans_t *tp, + xfs_inode_t *ip) +{ + ASSERT(ip->i_transp == tp); + ASSERT(ip->i_itemp != NULL); + ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE)); + + ip->i_itemp->ili_flags |= XFS_ILI_HOLD; +} + +/* + * Cancel the previous inode hold request made on this inode + * for this transaction. + */ +/*ARGSUSED*/ +void +xfs_trans_ihold_release( + xfs_trans_t *tp, + xfs_inode_t *ip) +{ + ASSERT(ip->i_transp == tp); + ASSERT(ip->i_itemp != NULL); + ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE)); + ASSERT(ip->i_itemp->ili_flags & XFS_ILI_HOLD); + + ip->i_itemp->ili_flags &= ~XFS_ILI_HOLD; +} + + +/* + * This is called to mark the fields indicated in fieldmask as needing + * to be logged when the transaction is committed. The inode must + * already be associated with the given transaction. + * + * The values for fieldmask are defined in xfs_inode_item.h. We always + * log all of the core inode if any of it has changed, and we always log + * all of the inline data/extents/b-tree root if any of them has changed. + */ +void +xfs_trans_log_inode( + xfs_trans_t *tp, + xfs_inode_t *ip, + uint flags) +{ + xfs_log_item_desc_t *lidp; + + ASSERT(ip->i_transp == tp); + ASSERT(ip->i_itemp != NULL); + ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE)); + + lidp = xfs_trans_find_item(tp, (xfs_log_item_t*)(ip->i_itemp)); + ASSERT(lidp != NULL); + + tp->t_flags |= XFS_TRANS_DIRTY; + lidp->lid_flags |= XFS_LID_DIRTY; + + /* + * Always OR in the bits from the ili_last_fields field. + * This is to coordinate with the xfs_iflush() and xfs_iflush_done() + * routines in the eventual clearing of the ilf_fields bits. + * See the big comment in xfs_iflush() for an explanation of + * this coorination mechanism. + */ + flags |= ip->i_itemp->ili_last_fields; + ip->i_itemp->ili_format.ilf_fields |= flags; +} + +#ifdef XFS_TRANS_DEBUG +/* + * Keep track of the state of the inode btree root to make sure we + * log it properly. + */ +STATIC void +xfs_trans_inode_broot_debug( + xfs_inode_t *ip) +{ + xfs_inode_log_item_t *iip; + + ASSERT(ip->i_itemp != NULL); + iip = ip->i_itemp; + if (iip->ili_root_size != 0) { + ASSERT(iip->ili_orig_root != NULL); + kmem_free(iip->ili_orig_root, iip->ili_root_size); + iip->ili_root_size = 0; + iip->ili_orig_root = NULL; + } + if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) { + ASSERT((ip->i_df.if_broot != NULL) && + (ip->i_df.if_broot_bytes > 0)); + iip->ili_root_size = ip->i_df.if_broot_bytes; + iip->ili_orig_root = + (char*)kmem_alloc(iip->ili_root_size, KM_SLEEP); + memcpy(iip->ili_orig_root, (char*)(ip->i_df.if_broot), + iip->ili_root_size); + } +} +#endif |