/*
- * Copyright (c) 2000-2005 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) 2000-2005 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
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms 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.
+ * 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. See the
+ * GNU General Public License for more details.
*
- * 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/
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
-
#include "xfs.h"
-
-#include "xfs_macros.h"
+#include "xfs_fs.h"
#include "xfs_types.h"
-#include "xfs_inum.h"
+#include "xfs_acl.h"
+#include "xfs_bit.h"
#include "xfs_log.h"
+#include "xfs_inum.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_alloc_btree.h"
#include "xfs_bmap_btree.h"
+#include "xfs_alloc_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_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
+#include "xfs_btree.h"
+#include "xfs_ialloc.h"
#include "xfs_quota.h"
#include "xfs_utils.h"
-#include "xfs_bit.h"
+#include "xfs_trans_priv.h"
+#include "xfs_inode_item.h"
+#include "xfs_bmap.h"
+#include "xfs_btree_trace.h"
+#include "xfs_dir2_trace.h"
+
/*
- * Initialize the inode hash table for the newly mounted file system.
- * Choose an initial table size based on user specified value, else
- * use a simple algorithm using the maximum number of inodes as an
- * indicator for table size, and clamp it between one and some large
- * number of pages.
+ * Allocate and initialise an xfs_inode.
*/
-void
-xfs_ihash_init(xfs_mount_t *mp)
+STATIC struct xfs_inode *
+xfs_inode_alloc(
+ struct xfs_mount *mp,
+ xfs_ino_t ino)
{
- __uint64_t icount;
- uint i, flags = KM_SLEEP | KM_MAYFAIL;
-
- if (!mp->m_ihsize) {
- icount = mp->m_maxicount ? mp->m_maxicount :
- (mp->m_sb.sb_dblocks << mp->m_sb.sb_inopblog);
- mp->m_ihsize = 1 << max_t(uint, 8,
- (xfs_highbit64(icount) + 1) / 2);
- mp->m_ihsize = min_t(uint, mp->m_ihsize,
- (64 * NBPP) / sizeof(xfs_ihash_t));
- }
+ struct xfs_inode *ip;
- while (!(mp->m_ihash = (xfs_ihash_t *)kmem_zalloc(mp->m_ihsize *
- sizeof(xfs_ihash_t), flags))) {
- if ((mp->m_ihsize >>= 1) <= NBPP)
- flags = KM_SLEEP;
- }
- for (i = 0; i < mp->m_ihsize; i++) {
- rwlock_init(&(mp->m_ihash[i].ih_lock));
+ /*
+ * if this didn't occur in transactions, we could use
+ * KM_MAYFAIL and return NULL here on ENOMEM. Set the
+ * code up to do this anyway.
+ */
+ ip = kmem_zone_alloc(xfs_inode_zone, KM_SLEEP);
+ if (!ip)
+ return NULL;
+ if (inode_init_always(mp->m_super, VFS_I(ip))) {
+ kmem_zone_free(xfs_inode_zone, ip);
+ return NULL;
}
-}
-/*
- * Free up structures allocated by xfs_ihash_init, at unmount time.
- */
-void
-xfs_ihash_free(xfs_mount_t *mp)
-{
- kmem_free(mp->m_ihash, mp->m_ihsize*sizeof(xfs_ihash_t));
- mp->m_ihash = NULL;
-}
+ ASSERT(atomic_read(&ip->i_iocount) == 0);
+ ASSERT(atomic_read(&ip->i_pincount) == 0);
+ ASSERT(!spin_is_locked(&ip->i_flags_lock));
+ ASSERT(completion_done(&ip->i_flush));
+
+ /* initialise the xfs inode */
+ ip->i_ino = ino;
+ ip->i_mount = mp;
+ memset(&ip->i_imap, 0, sizeof(struct xfs_imap));
+ ip->i_afp = NULL;
+ memset(&ip->i_df, 0, sizeof(xfs_ifork_t));
+ ip->i_flags = 0;
+ ip->i_update_core = 0;
+ ip->i_delayed_blks = 0;
+ memset(&ip->i_d, 0, sizeof(xfs_icdinode_t));
+ ip->i_size = 0;
+ ip->i_new_size = 0;
-/*
- * Initialize the inode cluster hash table for the newly mounted file system.
- * Its size is derived from the ihash table size.
- */
-void
-xfs_chash_init(xfs_mount_t *mp)
-{
- uint i;
-
- mp->m_chsize = max_t(uint, 1, mp->m_ihsize /
- (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog));
- mp->m_chsize = min_t(uint, mp->m_chsize, mp->m_ihsize);
- mp->m_chash = (xfs_chash_t *)kmem_zalloc(mp->m_chsize
- * sizeof(xfs_chash_t),
- KM_SLEEP);
- for (i = 0; i < mp->m_chsize; i++) {
- spinlock_init(&mp->m_chash[i].ch_lock,"xfshash");
- }
+ /*
+ * Initialize inode's trace buffers.
+ */
+#ifdef XFS_INODE_TRACE
+ ip->i_trace = ktrace_alloc(INODE_TRACE_SIZE, KM_NOFS);
+#endif
+#ifdef XFS_BMAP_TRACE
+ ip->i_xtrace = ktrace_alloc(XFS_BMAP_KTRACE_SIZE, KM_NOFS);
+#endif
+#ifdef XFS_BTREE_TRACE
+ ip->i_btrace = ktrace_alloc(XFS_BMBT_KTRACE_SIZE, KM_NOFS);
+#endif
+#ifdef XFS_RW_TRACE
+ ip->i_rwtrace = ktrace_alloc(XFS_RW_KTRACE_SIZE, KM_NOFS);
+#endif
+#ifdef XFS_ILOCK_TRACE
+ ip->i_lock_trace = ktrace_alloc(XFS_ILOCK_KTRACE_SIZE, KM_NOFS);
+#endif
+#ifdef XFS_DIR2_TRACE
+ ip->i_dir_trace = ktrace_alloc(XFS_DIR2_KTRACE_SIZE, KM_NOFS);
+#endif
+
+ /* prevent anyone from using this yet */
+ VFS_I(ip)->i_state = I_NEW|I_LOCK;
+
+ return ip;
}
-/*
- * Free up structures allocated by xfs_chash_init, at unmount time.
- */
-void
-xfs_chash_free(xfs_mount_t *mp)
+STATIC void
+xfs_inode_free(
+ struct xfs_inode *ip)
{
- int i;
+ switch (ip->i_d.di_mode & S_IFMT) {
+ case S_IFREG:
+ case S_IFDIR:
+ case S_IFLNK:
+ xfs_idestroy_fork(ip, XFS_DATA_FORK);
+ break;
+ }
- for (i = 0; i < mp->m_chsize; i++) {
- spinlock_destroy(&mp->m_chash[i].ch_lock);
+ if (ip->i_afp)
+ xfs_idestroy_fork(ip, XFS_ATTR_FORK);
+
+#ifdef XFS_INODE_TRACE
+ ktrace_free(ip->i_trace);
+#endif
+#ifdef XFS_BMAP_TRACE
+ ktrace_free(ip->i_xtrace);
+#endif
+#ifdef XFS_BTREE_TRACE
+ ktrace_free(ip->i_btrace);
+#endif
+#ifdef XFS_RW_TRACE
+ ktrace_free(ip->i_rwtrace);
+#endif
+#ifdef XFS_ILOCK_TRACE
+ ktrace_free(ip->i_lock_trace);
+#endif
+#ifdef XFS_DIR2_TRACE
+ ktrace_free(ip->i_dir_trace);
+#endif
+
+ if (ip->i_itemp) {
+ /*
+ * Only if we are shutting down the fs will we see an
+ * inode still in the AIL. If it is there, we should remove
+ * it to prevent a use-after-free from occurring.
+ */
+ xfs_log_item_t *lip = &ip->i_itemp->ili_item;
+ struct xfs_ail *ailp = lip->li_ailp;
+
+ ASSERT(((lip->li_flags & XFS_LI_IN_AIL) == 0) ||
+ XFS_FORCED_SHUTDOWN(ip->i_mount));
+ if (lip->li_flags & XFS_LI_IN_AIL) {
+ spin_lock(&ailp->xa_lock);
+ if (lip->li_flags & XFS_LI_IN_AIL)
+ xfs_trans_ail_delete(ailp, lip);
+ else
+ spin_unlock(&ailp->xa_lock);
+ }
+ xfs_inode_item_destroy(ip);
+ ip->i_itemp = NULL;
}
- kmem_free(mp->m_chash, mp->m_chsize*sizeof(xfs_chash_t));
- mp->m_chash = NULL;
+ /* asserts to verify all state is correct here */
+ ASSERT(atomic_read(&ip->i_iocount) == 0);
+ ASSERT(atomic_read(&ip->i_pincount) == 0);
+ ASSERT(!spin_is_locked(&ip->i_flags_lock));
+ ASSERT(completion_done(&ip->i_flush));
+
+ kmem_zone_free(xfs_inode_zone, ip);
}
/*
- * Try to move an inode to the front of its hash list if possible
- * (and if its not there already). Called right after obtaining
- * the list version number and then dropping the read_lock on the
- * hash list in question (which is done right after looking up the
- * inode in question...).
+ * Check the validity of the inode we just found it the cache
*/
-STATIC void
-xfs_ihash_promote(
- xfs_ihash_t *ih,
- xfs_inode_t *ip,
- ulong version)
+static int
+xfs_iget_cache_hit(
+ struct xfs_perag *pag,
+ struct xfs_inode *ip,
+ int flags,
+ int lock_flags) __releases(pag->pag_ici_lock)
{
- xfs_inode_t *iq;
-
- if ((ip->i_prevp != &ih->ih_next) && write_trylock(&ih->ih_lock)) {
- if (likely(version == ih->ih_version)) {
- /* remove from list */
- if ((iq = ip->i_next)) {
- iq->i_prevp = ip->i_prevp;
- }
- *ip->i_prevp = iq;
-
- /* insert at list head */
- iq = ih->ih_next;
- iq->i_prevp = &ip->i_next;
- ip->i_next = iq;
- ip->i_prevp = &ih->ih_next;
- ih->ih_next = ip;
- }
- write_unlock(&ih->ih_lock);
+ struct inode *inode = VFS_I(ip);
+ struct xfs_mount *mp = ip->i_mount;
+ int error;
+
+ spin_lock(&ip->i_flags_lock);
+
+ /*
+ * If we are racing with another cache hit that is currently
+ * instantiating this inode or currently recycling it out of
+ * reclaimabe state, wait for the initialisation to complete
+ * before continuing.
+ *
+ * XXX(hch): eventually we should do something equivalent to
+ * wait_on_inode to wait for these flags to be cleared
+ * instead of polling for it.
+ */
+ if (ip->i_flags & (XFS_INEW|XFS_IRECLAIM)) {
+ XFS_STATS_INC(xs_ig_frecycle);
+ error = EAGAIN;
+ goto out_error;
}
-}
-/*
- * Look up an inode by number in the given file system.
- * The inode is looked up in the hash table for the file system
- * represented by the mount point parameter mp. Each bucket of
- * the hash table is guarded by an individual semaphore.
- *
- * If the inode is found in the hash table, its corresponding vnode
- * is obtained with a call to vn_get(). This call takes care of
- * coordination with the reclamation of the inode and vnode. Note
- * that the vmap structure is filled in while holding the hash lock.
- * This gives us the state of the inode/vnode when we found it and
- * is used for coordination in vn_get().
- *
- * If it is not in core, read it in from the file system's device and
- * add the inode into the hash table.
- *
- * The inode is locked according to the value of the lock_flags parameter.
- * This flag parameter indicates how and if the inode's IO lock and inode lock
- * should be taken.
- *
- * mp -- the mount point structure for the current file system. It points
- * to the inode hash table.
- * tp -- a pointer to the current transaction if there is one. This is
- * simply passed through to the xfs_iread() call.
- * ino -- the number of the inode desired. This is the unique identifier
- * within the file system for the inode being requested.
- * lock_flags -- flags indicating how to lock the inode. See the comment
- * for xfs_ilock() for a list of valid values.
- * bno -- the block number starting the buffer containing the inode,
- * if known (as by bulkstat), else 0.
- */
-STATIC int
-xfs_iget_core(
- vnode_t *vp,
- xfs_mount_t *mp,
- xfs_trans_t *tp,
- xfs_ino_t ino,
- uint flags,
- uint lock_flags,
- xfs_inode_t **ipp,
- xfs_daddr_t bno)
-{
- xfs_ihash_t *ih;
- xfs_inode_t *ip;
- xfs_inode_t *iq;
- vnode_t *inode_vp;
- ulong version;
- int error;
- /* REFERENCED */
- xfs_chash_t *ch;
- xfs_chashlist_t *chl, *chlnew;
- SPLDECL(s);
+ /*
+ * If lookup is racing with unlink return an error immediately.
+ */
+ if (ip->i_d.di_mode == 0 && !(flags & XFS_IGET_CREATE)) {
+ error = ENOENT;
+ goto out_error;
+ }
+ /*
+ * If IRECLAIMABLE is set, we've torn down the VFS inode already.
+ * Need to carefully get it back into useable state.
+ */
+ if (ip->i_flags & XFS_IRECLAIMABLE) {
+ xfs_itrace_exit_tag(ip, "xfs_iget.alloc");
- ih = XFS_IHASH(mp, ino);
+ /*
+ * We need to set XFS_INEW atomically with clearing the
+ * reclaimable tag so that we do have an indicator of the
+ * inode still being initialized.
+ */
+ ip->i_flags |= XFS_INEW;
+ ip->i_flags &= ~XFS_IRECLAIMABLE;
+ __xfs_inode_clear_reclaim_tag(mp, pag, ip);
-again:
- read_lock(&ih->ih_lock);
+ spin_unlock(&ip->i_flags_lock);
+ read_unlock(&pag->pag_ici_lock);
- for (ip = ih->ih_next; ip != NULL; ip = ip->i_next) {
- if (ip->i_ino == ino) {
+ error = -inode_init_always(mp->m_super, inode);
+ if (error) {
/*
- * If INEW is set this inode is being set up
- * we need to pause and try again.
+ * Re-initializing the inode failed, and we are in deep
+ * trouble. Try to re-add it to the reclaim list.
*/
- if (ip->i_flags & XFS_INEW) {
- read_unlock(&ih->ih_lock);
- delay(1);
- XFS_STATS_INC(xs_ig_frecycle);
-
- goto again;
- }
-
- inode_vp = XFS_ITOV_NULL(ip);
- if (inode_vp == NULL) {
- /*
- * If IRECLAIM is set this inode is
- * on its way out of the system,
- * we need to pause and try again.
- */
- if (ip->i_flags & XFS_IRECLAIM) {
- read_unlock(&ih->ih_lock);
- delay(1);
- XFS_STATS_INC(xs_ig_frecycle);
-
- goto again;
- }
-
- vn_trace_exit(vp, "xfs_iget.alloc",
- (inst_t *)__return_address);
-
- XFS_STATS_INC(xs_ig_found);
-
- ip->i_flags &= ~XFS_IRECLAIMABLE;
- version = ih->ih_version;
- read_unlock(&ih->ih_lock);
- xfs_ihash_promote(ih, ip, version);
-
- XFS_MOUNT_ILOCK(mp);
- list_del_init(&ip->i_reclaim);
- XFS_MOUNT_IUNLOCK(mp);
-
- goto finish_inode;
-
- } else if (vp != inode_vp) {
- struct inode *inode = LINVFS_GET_IP(inode_vp);
-
- /* The inode is being torn down, pause and
- * try again.
- */
- if (inode->i_state & (I_FREEING | I_CLEAR)) {
- read_unlock(&ih->ih_lock);
- delay(1);
- XFS_STATS_INC(xs_ig_frecycle);
-
- goto again;
- }
-/* Chances are the other vnode (the one in the inode) is being torn
- * down right now, and we landed on top of it. Question is, what do
- * we do? Unhook the old inode and hook up the new one?
- */
- cmn_err(CE_PANIC,
- "xfs_iget_core: ambiguous vns: vp/0x%p, invp/0x%p",
- inode_vp, vp);
- }
+ read_lock(&pag->pag_ici_lock);
+ spin_lock(&ip->i_flags_lock);
- /*
- * Inode cache hit: if ip is not at the front of
- * its hash chain, move it there now.
- * Do this with the lock held for update, but
- * do statistics after releasing the lock.
- */
- version = ih->ih_version;
- read_unlock(&ih->ih_lock);
- xfs_ihash_promote(ih, ip, version);
- XFS_STATS_INC(xs_ig_found);
-
-finish_inode:
- if (ip->i_d.di_mode == 0) {
- if (!(flags & IGET_CREATE))
- return ENOENT;
- xfs_iocore_inode_reinit(ip);
- }
-
- if (lock_flags != 0)
- xfs_ilock(ip, lock_flags);
-
- ip->i_flags &= ~XFS_ISTALE;
-
- vn_trace_exit(vp, "xfs_iget.found",
- (inst_t *)__return_address);
- goto return_ip;
+ ip->i_flags &= ~XFS_INEW;
+ ip->i_flags |= XFS_IRECLAIMABLE;
+ __xfs_inode_set_reclaim_tag(pag, ip);
+ goto out_error;
+ }
+ inode->i_state = I_LOCK|I_NEW;
+ } else {
+ /* If the VFS inode is being torn down, pause and try again. */
+ if (!igrab(inode)) {
+ error = EAGAIN;
+ goto out_error;
}
- }
- /*
- * Inode cache miss: save the hash chain version stamp and unlock
- * the chain, so we don't deadlock in vn_alloc.
- */
- XFS_STATS_INC(xs_ig_missed);
+ /* We've got a live one. */
+ spin_unlock(&ip->i_flags_lock);
+ read_unlock(&pag->pag_ici_lock);
+ }
- version = ih->ih_version;
+ if (lock_flags != 0)
+ xfs_ilock(ip, lock_flags);
- read_unlock(&ih->ih_lock);
+ xfs_iflags_clear(ip, XFS_ISTALE);
+ xfs_itrace_exit_tag(ip, "xfs_iget.found");
+ XFS_STATS_INC(xs_ig_found);
+ return 0;
- /*
- * Read the disk inode attributes into a new inode structure and get
- * a new vnode for it. This should also initialize i_ino and i_mount.
- */
- error = xfs_iread(mp, tp, ino, &ip, bno);
- if (error) {
- return error;
- }
+out_error:
+ spin_unlock(&ip->i_flags_lock);
+ read_unlock(&pag->pag_ici_lock);
+ return error;
+}
- vn_trace_exit(vp, "xfs_iget.alloc", (inst_t *)__return_address);
- xfs_inode_lock_init(ip, vp);
- xfs_iocore_inode_init(ip);
+static int
+xfs_iget_cache_miss(
+ struct xfs_mount *mp,
+ struct xfs_perag *pag,
+ xfs_trans_t *tp,
+ xfs_ino_t ino,
+ struct xfs_inode **ipp,
+ xfs_daddr_t bno,
+ int flags,
+ int lock_flags) __releases(pag->pag_ici_lock)
+{
+ struct xfs_inode *ip;
+ int error;
+ unsigned long first_index, mask;
+ xfs_agino_t agino = XFS_INO_TO_AGINO(mp, ino);
- if (lock_flags != 0) {
- xfs_ilock(ip, lock_flags);
- }
-
- if ((ip->i_d.di_mode == 0) && !(flags & IGET_CREATE)) {
- xfs_idestroy(ip);
- return ENOENT;
- }
+ ip = xfs_inode_alloc(mp, ino);
+ if (!ip)
+ return ENOMEM;
- /*
- * Put ip on its hash chain, unless someone else hashed a duplicate
- * after we released the hash lock.
- */
- write_lock(&ih->ih_lock);
+ error = xfs_iread(mp, tp, ip, bno, flags);
+ if (error)
+ goto out_destroy;
- if (ih->ih_version != version) {
- for (iq = ih->ih_next; iq != NULL; iq = iq->i_next) {
- if (iq->i_ino == ino) {
- write_unlock(&ih->ih_lock);
- xfs_idestroy(ip);
+ xfs_itrace_exit_tag(ip, "xfs_iget.alloc");
- XFS_STATS_INC(xs_ig_dup);
- goto again;
- }
- }
+ if ((ip->i_d.di_mode == 0) && !(flags & XFS_IGET_CREATE)) {
+ error = ENOENT;
+ goto out_destroy;
}
/*
- * These values _must_ be set before releasing ihlock!
+ * Preload the radix tree so we can insert safely under the
+ * write spinlock. Note that we cannot sleep inside the preload
+ * region.
*/
- ip->i_hash = ih;
- if ((iq = ih->ih_next)) {
- iq->i_prevp = &ip->i_next;
+ if (radix_tree_preload(GFP_KERNEL)) {
+ error = EAGAIN;
+ goto out_destroy;
}
- ip->i_next = iq;
- ip->i_prevp = &ih->ih_next;
- ih->ih_next = ip;
- ip->i_udquot = ip->i_gdquot = NULL;
- ih->ih_version++;
- ip->i_flags |= XFS_INEW;
-
- write_unlock(&ih->ih_lock);
/*
- * put ip on its cluster's hash chain
+ * Because the inode hasn't been added to the radix-tree yet it can't
+ * be found by another thread, so we can do the non-sleeping lock here.
*/
- ASSERT(ip->i_chash == NULL && ip->i_cprev == NULL &&
- ip->i_cnext == NULL);
-
- chlnew = NULL;
- ch = XFS_CHASH(mp, ip->i_blkno);
- chlredo:
- s = mutex_spinlock(&ch->ch_lock);
- for (chl = ch->ch_list; chl != NULL; chl = chl->chl_next) {
- if (chl->chl_blkno == ip->i_blkno) {
-
- /* insert this inode into the doubly-linked list
- * where chl points */
- if ((iq = chl->chl_ip)) {
- ip->i_cprev = iq->i_cprev;
- iq->i_cprev->i_cnext = ip;
- iq->i_cprev = ip;
- ip->i_cnext = iq;
- } else {
- ip->i_cnext = ip;
- ip->i_cprev = ip;
- }
- chl->chl_ip = ip;
- ip->i_chash = chl;
- break;
- }
+ if (lock_flags) {
+ if (!xfs_ilock_nowait(ip, lock_flags))
+ BUG();
}
- /* no hash list found for this block; add a new hash list */
- if (chl == NULL) {
- if (chlnew == NULL) {
- mutex_spinunlock(&ch->ch_lock, s);
- ASSERT(xfs_chashlist_zone != NULL);
- chlnew = (xfs_chashlist_t *)
- kmem_zone_alloc(xfs_chashlist_zone,
- KM_SLEEP);
- ASSERT(chlnew != NULL);
- goto chlredo;
- } else {
- ip->i_cnext = ip;
- ip->i_cprev = ip;
- ip->i_chash = chlnew;
- chlnew->chl_ip = ip;
- chlnew->chl_blkno = ip->i_blkno;
- chlnew->chl_next = ch->ch_list;
- ch->ch_list = chlnew;
- chlnew = NULL;
- }
- } else {
- if (chlnew != NULL) {
- kmem_zone_free(xfs_chashlist_zone, chlnew);
- }
+ mask = ~(((XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog)) - 1);
+ first_index = agino & mask;
+ write_lock(&pag->pag_ici_lock);
+
+ /* insert the new inode */
+ error = radix_tree_insert(&pag->pag_ici_root, agino, ip);
+ if (unlikely(error)) {
+ WARN_ON(error != -EEXIST);
+ XFS_STATS_INC(xs_ig_dup);
+ error = EAGAIN;
+ goto out_preload_end;
}
- mutex_spinunlock(&ch->ch_lock, s);
-
-
- /*
- * Link ip to its mount and thread it on the mount's inode list.
- */
- XFS_MOUNT_ILOCK(mp);
- if ((iq = mp->m_inodes)) {
- ASSERT(iq->i_mprev->i_mnext == iq);
- ip->i_mprev = iq->i_mprev;
- iq->i_mprev->i_mnext = ip;
- iq->i_mprev = ip;
- ip->i_mnext = iq;
- } else {
- ip->i_mnext = ip;
- ip->i_mprev = ip;
- }
- mp->m_inodes = ip;
-
- XFS_MOUNT_IUNLOCK(mp);
-
- return_ip:
- ASSERT(ip->i_df.if_ext_max ==
- XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t));
-
- ASSERT(((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) != 0) ==
- ((ip->i_iocore.io_flags & XFS_IOCORE_RT) != 0));
+ /* These values _must_ be set before releasing the radix tree lock! */
+ ip->i_udquot = ip->i_gdquot = NULL;
+ xfs_iflags_set(ip, XFS_INEW);
+ write_unlock(&pag->pag_ici_lock);
+ radix_tree_preload_end();
*ipp = ip;
-
- /*
- * If we have a real type for an on-disk inode, we can set ops(&unlock)
- * now. If it's a new inode being created, xfs_ialloc will handle it.
- */
- VFS_INIT_VNODE(XFS_MTOVFS(mp), vp, XFS_ITOBHV(ip), 1);
-
return 0;
-}
+out_preload_end:
+ write_unlock(&pag->pag_ici_lock);
+ radix_tree_preload_end();
+ if (lock_flags)
+ xfs_iunlock(ip, lock_flags);
+out_destroy:
+ __destroy_inode(VFS_I(ip));
+ xfs_inode_free(ip);
+ return error;
+}
/*
- * The 'normal' internal xfs_iget, if needed it will
- * 'allocate', or 'get', the vnode.
+ * Look up an inode by number in the given file system.
+ * The inode is looked up in the cache held in each AG.
+ * If the inode is found in the cache, initialise the vfs inode
+ * if necessary.
+ *
+ * If it is not in core, read it in from the file system's device,
+ * add it to the cache and initialise the vfs inode.
+ *
+ * The inode is locked according to the value of the lock_flags parameter.
+ * This flag parameter indicates how and if the inode's IO lock and inode lock
+ * should be taken.
+ *
+ * mp -- the mount point structure for the current file system. It points
+ * to the inode hash table.
+ * tp -- a pointer to the current transaction if there is one. This is
+ * simply passed through to the xfs_iread() call.
+ * ino -- the number of the inode desired. This is the unique identifier
+ * within the file system for the inode being requested.
+ * lock_flags -- flags indicating how to lock the inode. See the comment
+ * for xfs_ilock() for a list of valid values.
+ * bno -- the block number starting the buffer containing the inode,
+ * if known (as by bulkstat), else 0.
*/
int
xfs_iget(
xfs_inode_t **ipp,
xfs_daddr_t bno)
{
- struct inode *inode;
- vnode_t *vp = NULL;
+ xfs_inode_t *ip;
int error;
+ xfs_perag_t *pag;
+ xfs_agino_t agino;
- XFS_STATS_INC(xs_ig_attempts);
-
- if ((inode = iget_locked(XFS_MTOVFS(mp)->vfs_super, ino))) {
- bhv_desc_t *bdp;
- xfs_inode_t *ip;
- int newnode;
-
- vp = LINVFS_GET_VP(inode);
- if (inode->i_state & I_NEW) {
-inode_allocate:
- vn_initialize(inode);
- error = xfs_iget_core(vp, mp, tp, ino, flags,
- lock_flags, ipp, bno);
- if (error) {
- vn_mark_bad(vp);
- if (inode->i_state & I_NEW)
- unlock_new_inode(inode);
- iput(inode);
- }
- } else {
- if (is_bad_inode(inode)) {
- iput(inode);
- return EIO;
- }
-
- bdp = vn_bhv_lookup(VN_BHV_HEAD(vp), &xfs_vnodeops);
- if (bdp == NULL) {
- XFS_STATS_INC(xs_ig_dup);
- goto inode_allocate;
- }
- ip = XFS_BHVTOI(bdp);
- if (lock_flags != 0)
- xfs_ilock(ip, lock_flags);
- newnode = (ip->i_d.di_mode == 0);
- if (newnode)
- xfs_iocore_inode_reinit(ip);
- XFS_STATS_INC(xs_ig_found);
- *ipp = ip;
- error = 0;
- }
- } else
- error = ENOMEM; /* If we got no inode we are out of memory */
+ /* the radix tree exists only in inode capable AGs */
+ if (XFS_INO_TO_AGNO(mp, ino) >= mp->m_maxagi)
+ return EINVAL;
- return error;
-}
+ /* get the perag structure and ensure that it's inode capable */
+ pag = xfs_get_perag(mp, ino);
+ if (!pag->pagi_inodeok)
+ return EINVAL;
+ ASSERT(pag->pag_ici_init);
+ agino = XFS_INO_TO_AGINO(mp, ino);
-/*
- * Do the setup for the various locks within the incore inode.
- */
-void
-xfs_inode_lock_init(
- xfs_inode_t *ip,
- vnode_t *vp)
-{
- mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
- "xfsino", (long)vp->v_number);
- mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", vp->v_number);
- init_waitqueue_head(&ip->i_ipin_wait);
- atomic_set(&ip->i_pincount, 0);
- init_sema(&ip->i_flock, 1, "xfsfino", vp->v_number);
-}
+again:
+ error = 0;
+ read_lock(&pag->pag_ici_lock);
+ ip = radix_tree_lookup(&pag->pag_ici_root, agino);
+
+ if (ip) {
+ error = xfs_iget_cache_hit(pag, ip, flags, lock_flags);
+ if (error)
+ goto out_error_or_again;
+ } else {
+ read_unlock(&pag->pag_ici_lock);
+ XFS_STATS_INC(xs_ig_missed);
-/*
- * Look for the inode corresponding to the given ino in the hash table.
- * If it is there and its i_transp pointer matches tp, return it.
- * Otherwise, return NULL.
- */
-xfs_inode_t *
-xfs_inode_incore(xfs_mount_t *mp,
- xfs_ino_t ino,
- xfs_trans_t *tp)
-{
- xfs_ihash_t *ih;
- xfs_inode_t *ip;
- ulong version;
+ error = xfs_iget_cache_miss(mp, pag, tp, ino, &ip, bno,
+ flags, lock_flags);
+ if (error)
+ goto out_error_or_again;
+ }
+ xfs_put_perag(mp, pag);
- ih = XFS_IHASH(mp, ino);
- read_lock(&ih->ih_lock);
- for (ip = ih->ih_next; ip != NULL; ip = ip->i_next) {
- if (ip->i_ino == ino) {
- /*
- * If we find it and tp matches, return it.
- * Also move it to the front of the hash list
- * if we find it and it is not already there.
- * Otherwise break from the loop and return
- * NULL.
- */
- if (ip->i_transp == tp) {
- version = ih->ih_version;
- read_unlock(&ih->ih_lock);
- xfs_ihash_promote(ih, ip, version);
- return (ip);
- }
- break;
- }
+ *ipp = ip;
+
+ ASSERT(ip->i_df.if_ext_max ==
+ XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t));
+ /*
+ * If we have a real type for an on-disk inode, we can set ops(&unlock)
+ * now. If it's a new inode being created, xfs_ialloc will handle it.
+ */
+ if (xfs_iflags_test(ip, XFS_INEW) && ip->i_d.di_mode != 0)
+ xfs_setup_inode(ip);
+ return 0;
+
+out_error_or_again:
+ if (error == EAGAIN) {
+ delay(1);
+ goto again;
}
- read_unlock(&ih->ih_lock);
- return (NULL);
+ xfs_put_perag(mp, pag);
+ return error;
}
/*
xfs_iput(xfs_inode_t *ip,
uint lock_flags)
{
- vnode_t *vp = XFS_ITOV(ip);
-
- vn_trace_entry(vp, "xfs_iput", (inst_t *)__return_address);
-
+ xfs_itrace_entry(ip);
xfs_iunlock(ip, lock_flags);
-
- VN_RELE(vp);
+ IRELE(ip);
}
/*
* Special iput for brand-new inodes that are still locked
*/
void
-xfs_iput_new(xfs_inode_t *ip,
- uint lock_flags)
+xfs_iput_new(
+ xfs_inode_t *ip,
+ uint lock_flags)
{
- vnode_t *vp = XFS_ITOV(ip);
- struct inode *inode = LINVFS_GET_IP(vp);
+ struct inode *inode = VFS_I(ip);
- vn_trace_entry(vp, "xfs_iput_new", (inst_t *)__return_address);
+ xfs_itrace_entry(ip);
if ((ip->i_d.di_mode == 0)) {
- ASSERT(!(ip->i_flags & XFS_IRECLAIMABLE));
- vn_mark_bad(vp);
+ ASSERT(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
+ make_bad_inode(inode);
}
if (inode->i_state & I_NEW)
unlock_new_inode(inode);
if (lock_flags)
xfs_iunlock(ip, lock_flags);
- VN_RELE(vp);
+ IRELE(ip);
}
-
/*
- * This routine embodies the part of the reclaim code that pulls
- * the inode from the inode hash table and the mount structure's
- * inode list.
- * This should only be called from xfs_reclaim().
+ * This is called free all the memory associated with an inode.
+ * It must free the inode itself and any buffers allocated for
+ * if_extents/if_data and if_broot. It must also free the lock
+ * associated with the inode.
+ *
+ * Note: because we don't initialise everything on reallocation out
+ * of the zone, we must ensure we nullify everything correctly before
+ * freeing the structure.
*/
void
-xfs_ireclaim(xfs_inode_t *ip)
+xfs_ireclaim(
+ struct xfs_inode *ip)
{
- vnode_t *vp;
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_perag *pag;
- /*
- * Remove from old hash list and mount list.
- */
XFS_STATS_INC(xs_ig_reclaims);
- xfs_iextract(ip);
-
/*
- * Here we do a spurious inode lock in order to coordinate with
- * xfs_sync(). This is because xfs_sync() references the inodes
- * in the mount list without taking references on the corresponding
- * vnodes. We make that OK here by ensuring that we wait until
- * the inode is unlocked in xfs_sync() before we go ahead and
- * free it. We get both the regular lock and the io lock because
- * the xfs_sync() code may need to drop the regular one but will
- * still hold the io lock.
+ * Remove the inode from the per-AG radix tree. It doesn't matter
+ * if it was never added to it because radix_tree_delete can deal
+ * with that case just fine.
*/
- xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+ pag = xfs_get_perag(mp, ip->i_ino);
+ write_lock(&pag->pag_ici_lock);
+ radix_tree_delete(&pag->pag_ici_root, XFS_INO_TO_AGINO(mp, ip->i_ino));
+ write_unlock(&pag->pag_ici_lock);
+ xfs_put_perag(mp, pag);
/*
- * Release dquots (and their references) if any. An inode may escape
- * xfs_inactive and get here via vn_alloc->vn_reclaim path.
+ * Here we do an (almost) spurious inode lock in order to coordinate
+ * with inode cache radix tree lookups. This is because the lookup
+ * can reference the inodes in the cache without taking references.
+ *
+ * We make that OK here by ensuring that we wait until the inode is
+ * unlocked after the lookup before we go ahead and free it. We get
+ * both the ilock and the iolock because the code may need to drop the
+ * ilock one but will still hold the iolock.
*/
- XFS_QM_DQDETACH(ip->i_mount, ip);
-
- /*
- * Pull our behavior descriptor from the vnode chain.
- */
- vp = XFS_ITOV_NULL(ip);
- if (vp) {
- vn_bhv_remove(VN_BHV_HEAD(vp), XFS_ITOBHV(ip));
- }
-
- /*
- * Free all memory associated with the inode.
- */
- xfs_idestroy(ip);
-}
-
-/*
- * This routine removes an about-to-be-destroyed inode from
- * all of the lists in which it is located with the exception
- * of the behavior chain.
- */
-void
-xfs_iextract(
- xfs_inode_t *ip)
-{
- xfs_ihash_t *ih;
- xfs_inode_t *iq;
- xfs_mount_t *mp;
- xfs_chash_t *ch;
- xfs_chashlist_t *chl, *chm;
- SPLDECL(s);
-
- ih = ip->i_hash;
- write_lock(&ih->ih_lock);
- if ((iq = ip->i_next)) {
- iq->i_prevp = ip->i_prevp;
- }
- *ip->i_prevp = iq;
- ih->ih_version++;
- write_unlock(&ih->ih_lock);
-
- /*
- * Remove from cluster hash list
- * 1) delete the chashlist if this is the last inode on the chashlist
- * 2) unchain from list of inodes
- * 3) point chashlist->chl_ip to 'chl_next' if to this inode.
- */
- mp = ip->i_mount;
- ch = XFS_CHASH(mp, ip->i_blkno);
- s = mutex_spinlock(&ch->ch_lock);
-
- if (ip->i_cnext == ip) {
- /* Last inode on chashlist */
- ASSERT(ip->i_cnext == ip && ip->i_cprev == ip);
- ASSERT(ip->i_chash != NULL);
- chm=NULL;
- for (chl = ch->ch_list; chl != NULL; chl = chl->chl_next) {
- if (chl->chl_blkno == ip->i_blkno) {
- if (chm == NULL) {
- /* first item on the list */
- ch->ch_list = chl->chl_next;
- } else {
- chm->chl_next = chl->chl_next;
- }
- kmem_zone_free(xfs_chashlist_zone, chl);
- break;
- } else {
- ASSERT(chl->chl_ip != ip);
- chm = chl;
- }
- }
- ASSERT_ALWAYS(chl != NULL);
- } else {
- /* delete one inode from a non-empty list */
- iq = ip->i_cnext;
- iq->i_cprev = ip->i_cprev;
- ip->i_cprev->i_cnext = iq;
- if (ip->i_chash->chl_ip == ip) {
- ip->i_chash->chl_ip = iq;
- }
- ip->i_chash = __return_address;
- ip->i_cprev = __return_address;
- ip->i_cnext = __return_address;
- }
- mutex_spinunlock(&ch->ch_lock, s);
-
- /*
- * Remove from mount's inode list.
- */
- XFS_MOUNT_ILOCK(mp);
- ASSERT((ip->i_mnext != NULL) && (ip->i_mprev != NULL));
- iq = ip->i_mnext;
- iq->i_mprev = ip->i_mprev;
- ip->i_mprev->i_mnext = iq;
-
- /*
- * Fix up the head pointer if it points to the inode being deleted.
- */
- if (mp->m_inodes == ip) {
- if (ip == iq) {
- mp->m_inodes = NULL;
- } else {
- mp->m_inodes = iq;
- }
- }
-
- /* Deal with the deleted inodes list */
- list_del_init(&ip->i_reclaim);
+ xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+ xfs_qm_dqdetach(ip);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
- mp->m_ireclaims++;
- XFS_MOUNT_IUNLOCK(mp);
+ xfs_inode_free(ip);
}
/*
* XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL
*/
void
-xfs_ilock(xfs_inode_t *ip,
- uint lock_flags)
+xfs_ilock(
+ xfs_inode_t *ip,
+ uint lock_flags)
{
/*
* You can't set both SHARED and EXCL for the same lock,
(XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
(XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
- ASSERT((lock_flags & ~XFS_LOCK_MASK) == 0);
+ ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
+
+ if (lock_flags & XFS_IOLOCK_EXCL)
+ mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
+ else if (lock_flags & XFS_IOLOCK_SHARED)
+ mraccess_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
+
+ if (lock_flags & XFS_ILOCK_EXCL)
+ mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
+ else if (lock_flags & XFS_ILOCK_SHARED)
+ mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
- if (lock_flags & XFS_IOLOCK_EXCL) {
- mrupdate(&ip->i_iolock);
- } else if (lock_flags & XFS_IOLOCK_SHARED) {
- mraccess(&ip->i_iolock);
- }
- if (lock_flags & XFS_ILOCK_EXCL) {
- mrupdate(&ip->i_lock);
- } else if (lock_flags & XFS_ILOCK_SHARED) {
- mraccess(&ip->i_lock);
- }
xfs_ilock_trace(ip, 1, lock_flags, (inst_t *)__return_address);
}
* lock_flags -- this parameter indicates the inode's locks to be
* to be locked. See the comment for xfs_ilock() for a list
* of valid values.
- *
*/
int
-xfs_ilock_nowait(xfs_inode_t *ip,
- uint lock_flags)
+xfs_ilock_nowait(
+ xfs_inode_t *ip,
+ uint lock_flags)
{
- int iolocked;
- int ilocked;
-
/*
* You can't set both SHARED and EXCL for the same lock,
* and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
(XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
(XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
- ASSERT((lock_flags & ~XFS_LOCK_MASK) == 0);
+ ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
- iolocked = 0;
if (lock_flags & XFS_IOLOCK_EXCL) {
- iolocked = mrtryupdate(&ip->i_iolock);
- if (!iolocked) {
- return 0;
- }
+ if (!mrtryupdate(&ip->i_iolock))
+ goto out;
} else if (lock_flags & XFS_IOLOCK_SHARED) {
- iolocked = mrtryaccess(&ip->i_iolock);
- if (!iolocked) {
- return 0;
- }
+ if (!mrtryaccess(&ip->i_iolock))
+ goto out;
}
if (lock_flags & XFS_ILOCK_EXCL) {
- ilocked = mrtryupdate(&ip->i_lock);
- if (!ilocked) {
- if (iolocked) {
- mrunlock(&ip->i_iolock);
- }
- return 0;
- }
+ if (!mrtryupdate(&ip->i_lock))
+ goto out_undo_iolock;
} else if (lock_flags & XFS_ILOCK_SHARED) {
- ilocked = mrtryaccess(&ip->i_lock);
- if (!ilocked) {
- if (iolocked) {
- mrunlock(&ip->i_iolock);
- }
- return 0;
- }
+ if (!mrtryaccess(&ip->i_lock))
+ goto out_undo_iolock;
}
xfs_ilock_trace(ip, 2, lock_flags, (inst_t *)__return_address);
return 1;
+
+ out_undo_iolock:
+ if (lock_flags & XFS_IOLOCK_EXCL)
+ mrunlock_excl(&ip->i_iolock);
+ else if (lock_flags & XFS_IOLOCK_SHARED)
+ mrunlock_shared(&ip->i_iolock);
+ out:
+ return 0;
}
/*
*
*/
void
-xfs_iunlock(xfs_inode_t *ip,
- uint lock_flags)
+xfs_iunlock(
+ xfs_inode_t *ip,
+ uint lock_flags)
{
/*
* You can't set both SHARED and EXCL for the same lock,
(XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
(XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
- ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_IUNLOCK_NONOTIFY)) == 0);
+ ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_IUNLOCK_NONOTIFY |
+ XFS_LOCK_DEP_MASK)) == 0);
ASSERT(lock_flags != 0);
- if (lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) {
- ASSERT(!(lock_flags & XFS_IOLOCK_SHARED) ||
- (ismrlocked(&ip->i_iolock, MR_ACCESS)));
- ASSERT(!(lock_flags & XFS_IOLOCK_EXCL) ||
- (ismrlocked(&ip->i_iolock, MR_UPDATE)));
- mrunlock(&ip->i_iolock);
- }
+ if (lock_flags & XFS_IOLOCK_EXCL)
+ mrunlock_excl(&ip->i_iolock);
+ else if (lock_flags & XFS_IOLOCK_SHARED)
+ mrunlock_shared(&ip->i_iolock);
- if (lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) {
- ASSERT(!(lock_flags & XFS_ILOCK_SHARED) ||
- (ismrlocked(&ip->i_lock, MR_ACCESS)));
- ASSERT(!(lock_flags & XFS_ILOCK_EXCL) ||
- (ismrlocked(&ip->i_lock, MR_UPDATE)));
- mrunlock(&ip->i_lock);
+ if (lock_flags & XFS_ILOCK_EXCL)
+ mrunlock_excl(&ip->i_lock);
+ else if (lock_flags & XFS_ILOCK_SHARED)
+ mrunlock_shared(&ip->i_lock);
+ if ((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) &&
+ !(lock_flags & XFS_IUNLOCK_NONOTIFY) && ip->i_itemp) {
/*
* Let the AIL know that this item has been unlocked in case
* it is in the AIL and anyone is waiting on it. Don't do
* this if the caller has asked us not to.
*/
- if (!(lock_flags & XFS_IUNLOCK_NONOTIFY) &&
- ip->i_itemp != NULL) {
- xfs_trans_unlocked_item(ip->i_mount,
- (xfs_log_item_t*)(ip->i_itemp));
- }
+ xfs_trans_unlocked_item(ip->i_itemp->ili_item.li_ailp,
+ (xfs_log_item_t*)(ip->i_itemp));
}
xfs_ilock_trace(ip, 3, lock_flags, (inst_t *)__return_address);
}
* if it is being demoted.
*/
void
-xfs_ilock_demote(xfs_inode_t *ip,
- uint lock_flags)
+xfs_ilock_demote(
+ xfs_inode_t *ip,
+ uint lock_flags)
{
ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL));
ASSERT((lock_flags & ~(XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)) == 0);
- if (lock_flags & XFS_ILOCK_EXCL) {
- ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
+ if (lock_flags & XFS_ILOCK_EXCL)
mrdemote(&ip->i_lock);
- }
- if (lock_flags & XFS_IOLOCK_EXCL) {
- ASSERT(ismrlocked(&ip->i_iolock, MR_UPDATE));
+ if (lock_flags & XFS_IOLOCK_EXCL)
mrdemote(&ip->i_iolock);
+}
+
+#ifdef DEBUG
+/*
+ * Debug-only routine, without additional rw_semaphore APIs, we can
+ * now only answer requests regarding whether we hold the lock for write
+ * (reader state is outside our visibility, we only track writer state).
+ *
+ * Note: this means !xfs_isilocked would give false positives, so don't do that.
+ */
+int
+xfs_isilocked(
+ xfs_inode_t *ip,
+ uint lock_flags)
+{
+ if ((lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) ==
+ XFS_ILOCK_EXCL) {
+ if (!ip->i_lock.mr_writer)
+ return 0;
+ }
+
+ if ((lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) ==
+ XFS_IOLOCK_EXCL) {
+ if (!ip->i_iolock.mr_writer)
+ return 0;
}
+
+ return 1;
}
+#endif
+
+#ifdef XFS_INODE_TRACE
+
+#define KTRACE_ENTER(ip, vk, s, line, ra) \
+ ktrace_enter((ip)->i_trace, \
+/* 0 */ (void *)(__psint_t)(vk), \
+/* 1 */ (void *)(s), \
+/* 2 */ (void *)(__psint_t) line, \
+/* 3 */ (void *)(__psint_t)atomic_read(&VFS_I(ip)->i_count), \
+/* 4 */ (void *)(ra), \
+/* 5 */ NULL, \
+/* 6 */ (void *)(__psint_t)current_cpu(), \
+/* 7 */ (void *)(__psint_t)current_pid(), \
+/* 8 */ (void *)__return_address, \
+/* 9 */ NULL, NULL, NULL, NULL, NULL, NULL, NULL)
/*
- * The following three routines simply manage the i_flock
- * semaphore embedded in the inode. This semaphore synchronizes
- * processes attempting to flush the in-core inode back to disk.
+ * Vnode tracing code.
*/
void
-xfs_iflock(xfs_inode_t *ip)
+_xfs_itrace_entry(xfs_inode_t *ip, const char *func, inst_t *ra)
{
- psema(&(ip->i_flock), PINOD|PLTWAIT);
+ KTRACE_ENTER(ip, INODE_KTRACE_ENTRY, func, 0, ra);
}
-int
-xfs_iflock_nowait(xfs_inode_t *ip)
+void
+_xfs_itrace_exit(xfs_inode_t *ip, const char *func, inst_t *ra)
+{
+ KTRACE_ENTER(ip, INODE_KTRACE_EXIT, func, 0, ra);
+}
+
+void
+xfs_itrace_hold(xfs_inode_t *ip, char *file, int line, inst_t *ra)
+{
+ KTRACE_ENTER(ip, INODE_KTRACE_HOLD, file, line, ra);
+}
+
+void
+_xfs_itrace_ref(xfs_inode_t *ip, char *file, int line, inst_t *ra)
{
- return (cpsema(&(ip->i_flock)));
+ KTRACE_ENTER(ip, INODE_KTRACE_REF, file, line, ra);
}
void
-xfs_ifunlock(xfs_inode_t *ip)
+xfs_itrace_rele(xfs_inode_t *ip, char *file, int line, inst_t *ra)
{
- ASSERT(valusema(&(ip->i_flock)) <= 0);
- vsema(&(ip->i_flock));
+ KTRACE_ENTER(ip, INODE_KTRACE_RELE, file, line, ra);
}
+#endif /* XFS_INODE_TRACE */