/*
* Reference count of Linux inode if present, -1 if the xfs_inode
* has no associated Linux inode.
*/
static inline int xfs_icount(struct xfs_inode *ip)
{
bhv_vnode_t *vp = XFS_ITOV_NULL(ip);
if (vp)
return vn_count(vp);
return -1;
}
/*
* If the linux inode exists, mark it dirty.
* Used when commiting a dirty inode into a transaction so that
* the inode will get written back by the linux code
*/
void
xfs_mark_inode_dirty_sync(
xfs_inode_t *ip)
{
bhv_vnode_t *vp;
vp = XFS_ITOV_NULL(ip);
if (vp)
mark_inode_dirty_sync(vn_to_inode(vp));
}
/*
* Bring the atime in the XFS inode uptodate.
* Used before logging the inode to disk or when the Linux inode goes away.
*/
void
xfs_synchronize_atime(
xfs_inode_t *ip)
{
bhv_vnode_t *vp;
vp = XFS_ITOV_NULL(ip);
if (vp) {
ip->i_d.di_atime.t_sec = (__int32_t)vp->i_atime.tv_sec;
ip->i_d.di_atime.t_nsec = (__int32_t)vp->i_atime.tv_nsec;
}
}
/*
* Bring the atime in the XFS inode uptodate.
* Used before logging the inode to disk or when the Linux inode goes away.
*/
void
xfs_synchronize_atime(
xfs_inode_t *ip)
{
vnode_t *vp;
vp = XFS_ITOV_NULL(ip);
if (vp) {
struct inode *inode = &vp->v_inode;
ip->i_d.di_atime.t_sec = (__int32_t)inode->i_atime.tv_sec;
ip->i_d.di_atime.t_nsec = (__int32_t)inode->i_atime.tv_nsec;
}
}
/*
* Go thru all the inodes in the file system, releasing their dquots.
* Note that the mount structure gets modified to indicate that quotas are off
* AFTER this, in the case of quotaoff. This also gets called from
* xfs_rootumount.
*/
void
xfs_qm_dqrele_all_inodes(
struct xfs_mount *mp,
uint flags)
{
xfs_inode_t *ip, *topino;
uint ireclaims;
bhv_vnode_t *vp;
boolean_t vnode_refd;
ASSERT(mp->m_quotainfo);
XFS_MOUNT_ILOCK(mp);
again:
ip = mp->m_inodes;
if (ip == NULL) {
XFS_MOUNT_IUNLOCK(mp);
return;
}
do {
/* Skip markers inserted by xfs_sync */
if (ip->i_mount == NULL) {
ip = ip->i_mnext;
continue;
}
/* Root inode, rbmip and rsumip have associated blocks */
if (ip == XFS_QI_UQIP(mp) || ip == XFS_QI_GQIP(mp)) {
ASSERT(ip->i_udquot == NULL);
ASSERT(ip->i_gdquot == NULL);
ip = ip->i_mnext;
continue;
}
vp = XFS_ITOV_NULL(ip);
if (!vp) {
ASSERT(ip->i_udquot == NULL);
ASSERT(ip->i_gdquot == NULL);
ip = ip->i_mnext;
continue;
}
vnode_refd = B_FALSE;
if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL) == 0) {
ireclaims = mp->m_ireclaims;
topino = mp->m_inodes;
vp = vn_grab(vp);
if (!vp)
goto again;
XFS_MOUNT_IUNLOCK(mp);
/* XXX restart limit ? */
xfs_ilock(ip, XFS_ILOCK_EXCL);
vnode_refd = B_TRUE;
} else {
ireclaims = mp->m_ireclaims;
topino = mp->m_inodes;
XFS_MOUNT_IUNLOCK(mp);
}
/*
* We don't keep the mountlock across the dqrele() call,
* since it can take a while..
*/
if ((flags & XFS_UQUOTA_ACCT) && ip->i_udquot) {
xfs_qm_dqrele(ip->i_udquot);
ip->i_udquot = NULL;
}
if (flags & (XFS_PQUOTA_ACCT|XFS_GQUOTA_ACCT) && ip->i_gdquot) {
xfs_qm_dqrele(ip->i_gdquot);
ip->i_gdquot = NULL;
}
xfs_iunlock(ip, XFS_ILOCK_EXCL);
/*
* Wait until we've dropped the ilock and mountlock to
* do the vn_rele. Or be condemned to an eternity in the
* inactive code in hell.
*/
if (vnode_refd)
VN_RELE(vp);
XFS_MOUNT_ILOCK(mp);
/*
* If an inode was inserted or removed, we gotta
* start over again.
*/
if (topino != mp->m_inodes || mp->m_ireclaims != ireclaims) {
/* XXX use a sentinel */
goto again;
}
ip = ip->i_mnext;
} while (ip != mp->m_inodes);
XFS_MOUNT_IUNLOCK(mp);
}
/*
* xfs sync routine for internal use
*
* This routine supports all of the flags defined for the generic VFS_SYNC
* interface as explained above under xfs_sync. In the interests of not
* changing interfaces within the 6.5 family, additional internallly-
* required functions are specified within a separate xflags parameter,
* only available by calling this routine.
*
*/
STATIC int
xfs_sync_inodes(
xfs_mount_t *mp,
int flags,
int xflags,
int *bypassed)
{
xfs_inode_t *ip = NULL;
xfs_inode_t *ip_next;
xfs_buf_t *bp;
vnode_t *vp = NULL;
vmap_t vmap;
int error;
int last_error;
uint64_t fflag;
uint lock_flags;
uint base_lock_flags;
boolean_t mount_locked;
boolean_t vnode_refed;
int preempt;
xfs_dinode_t *dip;
xfs_iptr_t *ipointer;
#ifdef DEBUG
boolean_t ipointer_in = B_FALSE;
#define IPOINTER_SET ipointer_in = B_TRUE
#define IPOINTER_CLR ipointer_in = B_FALSE
#else
#define IPOINTER_SET
#define IPOINTER_CLR
#endif
/* Insert a marker record into the inode list after inode ip. The list
* must be locked when this is called. After the call the list will no
* longer be locked.
*/
#define IPOINTER_INSERT(ip, mp) { \
ASSERT(ipointer_in == B_FALSE); \
ipointer->ip_mnext = ip->i_mnext; \
ipointer->ip_mprev = ip; \
ip->i_mnext = (xfs_inode_t *)ipointer; \
ipointer->ip_mnext->i_mprev = (xfs_inode_t *)ipointer; \
preempt = 0; \
XFS_MOUNT_IUNLOCK(mp); \
mount_locked = B_FALSE; \
IPOINTER_SET; \
}
/* Remove the marker from the inode list. If the marker was the only item
* in the list then there are no remaining inodes and we should zero out
* the whole list. If we are the current head of the list then move the head
* past us.
*/
#define IPOINTER_REMOVE(ip, mp) { \
ASSERT(ipointer_in == B_TRUE); \
if (ipointer->ip_mnext != (xfs_inode_t *)ipointer) { \
ip = ipointer->ip_mnext; \
ip->i_mprev = ipointer->ip_mprev; \
ipointer->ip_mprev->i_mnext = ip; \
if (mp->m_inodes == (xfs_inode_t *)ipointer) { \
mp->m_inodes = ip; \
} \
} else { \
ASSERT(mp->m_inodes == (xfs_inode_t *)ipointer); \
mp->m_inodes = NULL; \
ip = NULL; \
} \
IPOINTER_CLR; \
}
#define XFS_PREEMPT_MASK 0x7f
if (bypassed)
*bypassed = 0;
if (XFS_MTOVFS(mp)->vfs_flag & VFS_RDONLY)
return 0;
error = 0;
last_error = 0;
preempt = 0;
/* Allocate a reference marker */
ipointer = (xfs_iptr_t *)kmem_zalloc(sizeof(xfs_iptr_t), KM_SLEEP);
fflag = XFS_B_ASYNC; /* default is don't wait */
if (flags & SYNC_BDFLUSH)
fflag = XFS_B_DELWRI;
if (flags & SYNC_WAIT)
fflag = 0; /* synchronous overrides all */
base_lock_flags = XFS_ILOCK_SHARED;
if (flags & (SYNC_DELWRI | SYNC_CLOSE)) {
/*
* We need the I/O lock if we're going to call any of
* the flush/inval routines.
*/
base_lock_flags |= XFS_IOLOCK_SHARED;
}
XFS_MOUNT_ILOCK(mp);
ip = mp->m_inodes;
mount_locked = B_TRUE;
vnode_refed = B_FALSE;
IPOINTER_CLR;
do {
ASSERT(ipointer_in == B_FALSE);
ASSERT(vnode_refed == B_FALSE);
lock_flags = base_lock_flags;
/*
* There were no inodes in the list, just break out
* of the loop.
*/
if (ip == NULL) {
break;
}
/*
* We found another sync thread marker - skip it
*/
if (ip->i_mount == NULL) {
ip = ip->i_mnext;
continue;
}
vp = XFS_ITOV_NULL(ip);
/*
* If the vnode is gone then this is being torn down,
* call reclaim if it is flushed, else let regular flush
* code deal with it later in the loop.
*/
if (vp == NULL) {
/* Skip ones already in reclaim */
if (ip->i_flags & XFS_IRECLAIM) {
ip = ip->i_mnext;
continue;
}
if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL) == 0) {
ip = ip->i_mnext;
} else if ((xfs_ipincount(ip) == 0) &&
xfs_iflock_nowait(ip)) {
IPOINTER_INSERT(ip, mp);
xfs_finish_reclaim(ip, 1,
XFS_IFLUSH_DELWRI_ELSE_ASYNC);
XFS_MOUNT_ILOCK(mp);
mount_locked = B_TRUE;
IPOINTER_REMOVE(ip, mp);
} else {
xfs_iunlock(ip, XFS_ILOCK_EXCL);
ip = ip->i_mnext;
}
continue;
}
if (XFS_FORCED_SHUTDOWN(mp) && !(flags & SYNC_CLOSE)) {
XFS_MOUNT_IUNLOCK(mp);
kmem_free(ipointer, sizeof(xfs_iptr_t));
return 0;
}
/*
* If this is just vfs_sync() or pflushd() calling
* then we can skip inodes for which it looks like
* there is nothing to do. Since we don't have the
* inode locked this is racey, but these are periodic
* calls so it doesn't matter. For the others we want
* to know for sure, so we at least try to lock them.
*/
if (flags & SYNC_BDFLUSH) {
if (((ip->i_itemp == NULL) ||
!(ip->i_itemp->ili_format.ilf_fields &
XFS_ILOG_ALL)) &&
(ip->i_update_core == 0)) {
ip = ip->i_mnext;
continue;
}
}
/*
* Try to lock without sleeping. We're out of order with
* the inode list lock here, so if we fail we need to drop
* the mount lock and try again. If we're called from
* bdflush() here, then don't bother.
*
* The inode lock here actually coordinates with the
* almost spurious inode lock in xfs_ireclaim() to prevent
* the vnode we handle here without a reference from
* being freed while we reference it. If we lock the inode
* while it's on the mount list here, then the spurious inode
* lock in xfs_ireclaim() after the inode is pulled from
* the mount list will sleep until we release it here.
* This keeps the vnode from being freed while we reference
* it. It is also cheaper and simpler than actually doing
* a vn_get() for every inode we touch here.
*/
if (xfs_ilock_nowait(ip, lock_flags) == 0) {
if ((flags & SYNC_BDFLUSH) || (vp == NULL)) {
ip = ip->i_mnext;
continue;
}
/*
* We need to unlock the inode list lock in order
* to lock the inode. Insert a marker record into
* the inode list to remember our position, dropping
* the lock is now done inside the IPOINTER_INSERT
* macro.
*
* We also use the inode list lock to protect us
* in taking a snapshot of the vnode version number
* for use in calling vn_get().
*/
VMAP(vp, vmap);
IPOINTER_INSERT(ip, mp);
vp = vn_get(vp, &vmap);
if (vp == NULL) {
/*
* The vnode was reclaimed once we let go
* of the inode list lock. Skip to the
* next list entry. Remove the marker.
*/
XFS_MOUNT_ILOCK(mp);
mount_locked = B_TRUE;
vnode_refed = B_FALSE;
IPOINTER_REMOVE(ip, mp);
continue;
}
xfs_ilock(ip, lock_flags);
ASSERT(vp == XFS_ITOV(ip));
ASSERT(ip->i_mount == mp);
vnode_refed = B_TRUE;
}
/* From here on in the loop we may have a marker record
* in the inode list.
*/
if ((flags & SYNC_CLOSE) && (vp != NULL)) {
/*
* This is the shutdown case. We just need to
* flush and invalidate all the pages associated
* with the inode. Drop the inode lock since
* we can't hold it across calls to the buffer
* cache.
*
* We don't set the VREMAPPING bit in the vnode
* here, because we don't hold the vnode lock
* exclusively. It doesn't really matter, though,
* because we only come here when we're shutting
* down anyway.
*/
xfs_iunlock(ip, XFS_ILOCK_SHARED);
if (XFS_FORCED_SHUTDOWN(mp)) {
VOP_TOSS_PAGES(vp, 0, -1, FI_REMAPF);
} else {
VOP_FLUSHINVAL_PAGES(vp, 0, -1, FI_REMAPF);
}
xfs_ilock(ip, XFS_ILOCK_SHARED);
} else if ((flags & SYNC_DELWRI) && (vp != NULL)) {
if (VN_DIRTY(vp)) {
/* We need to have dropped the lock here,
* so insert a marker if we have not already
* done so.
*/
if (mount_locked) {
IPOINTER_INSERT(ip, mp);
}
/*
* Drop the inode lock since we can't hold it
* across calls to the buffer cache.
*/
xfs_iunlock(ip, XFS_ILOCK_SHARED);
VOP_FLUSH_PAGES(vp, (xfs_off_t)0, -1,
fflag, FI_NONE, error);
xfs_ilock(ip, XFS_ILOCK_SHARED);
}
}
if (flags & SYNC_BDFLUSH) {
if ((flags & SYNC_ATTR) &&
((ip->i_update_core) ||
((ip->i_itemp != NULL) &&
(ip->i_itemp->ili_format.ilf_fields != 0)))) {
/* Insert marker and drop lock if not already
* done.
*/
if (mount_locked) {
IPOINTER_INSERT(ip, mp);
}
/*
* We don't want the periodic flushing of the
* inodes by vfs_sync() to interfere with
* I/O to the file, especially read I/O
* where it is only the access time stamp
* that is being flushed out. To prevent
* long periods where we have both inode
* locks held shared here while reading the
* inode's buffer in from disk, we drop the
* inode lock while reading in the inode
* buffer. We have to release the buffer
* and reacquire the inode lock so that they
* are acquired in the proper order (inode
* locks first). The buffer will go at the
* end of the lru chain, though, so we can
* expect it to still be there when we go
* for it again in xfs_iflush().
*/
if ((xfs_ipincount(ip) == 0) &&
xfs_iflock_nowait(ip)) {
xfs_ifunlock(ip);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
error = xfs_itobp(mp, NULL, ip,
&dip, &bp, 0);
if (!error) {
xfs_buf_relse(bp);
} else {
/* Bailing out, remove the
* marker and free it.
*/
XFS_MOUNT_ILOCK(mp);
IPOINTER_REMOVE(ip, mp);
XFS_MOUNT_IUNLOCK(mp);
ASSERT(!(lock_flags &
XFS_IOLOCK_SHARED));
kmem_free(ipointer,
sizeof(xfs_iptr_t));
return (0);
}
/*
* Since we dropped the inode lock,
* the inode may have been reclaimed.
* Therefore, we reacquire the mount
* lock and check to see if we were the
* inode reclaimed. If this happened
* then the ipointer marker will no
* longer point back at us. In this
* case, move ip along to the inode
* after the marker, remove the marker
* and continue.
*/
XFS_MOUNT_ILOCK(mp);
mount_locked = B_TRUE;
if (ip != ipointer->ip_mprev) {
IPOINTER_REMOVE(ip, mp);
ASSERT(!vnode_refed);
ASSERT(!(lock_flags &
XFS_IOLOCK_SHARED));
continue;
}
ASSERT(ip->i_mount == mp);
if (xfs_ilock_nowait(ip,
XFS_ILOCK_SHARED) == 0) {
ASSERT(ip->i_mount == mp);
/*
* We failed to reacquire
* the inode lock without
* sleeping, so just skip
* the inode for now. We
* clear the ILOCK bit from
* the lock_flags so that we
* won't try to drop a lock
* we don't hold below.
*/
lock_flags &= ~XFS_ILOCK_SHARED;
IPOINTER_REMOVE(ip_next, mp);
} else if ((xfs_ipincount(ip) == 0) &&
xfs_iflock_nowait(ip)) {
ASSERT(ip->i_mount == mp);
/*
* Since this is vfs_sync()
* calling we only flush the
* inode out if we can lock
* it without sleeping and
* it is not pinned. Drop
* the mount lock here so
* that we don't hold it for
* too long. We already have
* a marker in the list here.
*/
XFS_MOUNT_IUNLOCK(mp);
mount_locked = B_FALSE;
error = xfs_iflush(ip,
XFS_IFLUSH_DELWRI);
} else {
ASSERT(ip->i_mount == mp);
IPOINTER_REMOVE(ip_next, mp);
}
}
}
} else {
if ((flags & SYNC_ATTR) &&
((ip->i_update_core) ||
((ip->i_itemp != NULL) &&
(ip->i_itemp->ili_format.ilf_fields != 0)))) {
if (mount_locked) {
IPOINTER_INSERT(ip, mp);
}
if (flags & SYNC_WAIT) {
xfs_iflock(ip);
error = xfs_iflush(ip,
XFS_IFLUSH_SYNC);
} else {
/*
* If we can't acquire the flush
* lock, then the inode is already
* being flushed so don't bother
* waiting. If we can lock it then
* do a delwri flush so we can
* combine multiple inode flushes
* in each disk write.
*/
if (xfs_iflock_nowait(ip)) {
error = xfs_iflush(ip,
XFS_IFLUSH_DELWRI);
}
else if (bypassed)
(*bypassed)++;
}
}
}
if (lock_flags != 0) {
xfs_iunlock(ip, lock_flags);
}
if (vnode_refed) {
/*
* If we had to take a reference on the vnode
* above, then wait until after we've unlocked
* the inode to release the reference. This is
* because we can be already holding the inode
* lock when VN_RELE() calls xfs_inactive().
*
* Make sure to drop the mount lock before calling
* VN_RELE() so that we don't trip over ourselves if
* we have to go for the mount lock again in the
* inactive code.
*/
if (mount_locked) {
IPOINTER_INSERT(ip, mp);
}
VN_RELE(vp);
vnode_refed = B_FALSE;
}
if (error) {
last_error = error;
}
/*
* bail out if the filesystem is corrupted.
*/
if (error == EFSCORRUPTED) {
if (!mount_locked) {
XFS_MOUNT_ILOCK(mp);
IPOINTER_REMOVE(ip, mp);
}
XFS_MOUNT_IUNLOCK(mp);
ASSERT(ipointer_in == B_FALSE);
kmem_free(ipointer, sizeof(xfs_iptr_t));
return XFS_ERROR(error);
}
/* Let other threads have a chance at the mount lock
* if we have looped many times without dropping the
* lock.
*/
if ((++preempt & XFS_PREEMPT_MASK) == 0) {
if (mount_locked) {
IPOINTER_INSERT(ip, mp);
}
}
if (mount_locked == B_FALSE) {
XFS_MOUNT_ILOCK(mp);
mount_locked = B_TRUE;
IPOINTER_REMOVE(ip, mp);
continue;
}
ASSERT(ipointer_in == B_FALSE);
ip = ip->i_mnext;
} while (ip != mp->m_inodes);
XFS_MOUNT_IUNLOCK(mp);
ASSERT(ipointer_in == B_FALSE);
kmem_free(ipointer, sizeof(xfs_iptr_t));
return XFS_ERROR(last_error);
}
