diff options
Diffstat (limited to 'fs/xfs/xfs_vfsops.c')
| -rw-r--r-- | fs/xfs/xfs_vfsops.c | 757 |
1 files changed, 0 insertions, 757 deletions
diff --git a/fs/xfs/xfs_vfsops.c b/fs/xfs/xfs_vfsops.c deleted file mode 100644 index 439dd3939dd..00000000000 --- a/fs/xfs/xfs_vfsops.c +++ /dev/null @@ -1,757 +0,0 @@ -/* - * 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 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. See the - * GNU General Public License for more details. - * - * 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_fs.h" -#include "xfs_types.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_dir2.h" -#include "xfs_dmapi.h" -#include "xfs_mount.h" -#include "xfs_da_btree.h" -#include "xfs_bmap_btree.h" -#include "xfs_ialloc_btree.h" -#include "xfs_alloc_btree.h" -#include "xfs_dir2_sf.h" -#include "xfs_attr_sf.h" -#include "xfs_dinode.h" -#include "xfs_inode.h" -#include "xfs_inode_item.h" -#include "xfs_btree.h" -#include "xfs_alloc.h" -#include "xfs_ialloc.h" -#include "xfs_quota.h" -#include "xfs_error.h" -#include "xfs_bmap.h" -#include "xfs_rw.h" -#include "xfs_buf_item.h" -#include "xfs_log_priv.h" -#include "xfs_dir2_trace.h" -#include "xfs_extfree_item.h" -#include "xfs_acl.h" -#include "xfs_attr.h" -#include "xfs_clnt.h" -#include "xfs_mru_cache.h" -#include "xfs_filestream.h" -#include "xfs_fsops.h" -#include "xfs_vnodeops.h" -#include "xfs_vfsops.h" -#include "xfs_utils.h" - - -STATIC void -xfs_quiesce_fs( - xfs_mount_t *mp) -{ - int count = 0, pincount; - - xfs_flush_buftarg(mp->m_ddev_targp, 0); - xfs_finish_reclaim_all(mp, 0); - - /* This loop must run at least twice. - * The first instance of the loop will flush - * most meta data but that will generate more - * meta data (typically directory updates). - * Which then must be flushed and logged before - * we can write the unmount record. - */ - do { - xfs_syncsub(mp, SYNC_INODE_QUIESCE, NULL); - pincount = xfs_flush_buftarg(mp->m_ddev_targp, 1); - if (!pincount) { - delay(50); - count++; - } - } while (count < 2); -} - -/* - * Second stage of a quiesce. The data is already synced, now we have to take - * care of the metadata. New transactions are already blocked, so we need to - * wait for any remaining transactions to drain out before proceding. - */ -void -xfs_attr_quiesce( - xfs_mount_t *mp) -{ - int error = 0; - - /* wait for all modifications to complete */ - while (atomic_read(&mp->m_active_trans) > 0) - delay(100); - - /* flush inodes and push all remaining buffers out to disk */ - xfs_quiesce_fs(mp); - - ASSERT_ALWAYS(atomic_read(&mp->m_active_trans) == 0); - - /* Push the superblock and write an unmount record */ - error = xfs_log_sbcount(mp, 1); - if (error) - xfs_fs_cmn_err(CE_WARN, mp, - "xfs_attr_quiesce: failed to log sb changes. " - "Frozen image may not be consistent."); - xfs_log_unmount_write(mp); - xfs_unmountfs_writesb(mp); -} - -/* - * xfs_unmount_flush implements a set of flush operation on special - * inodes, which are needed as a separate set of operations so that - * they can be called as part of relocation process. - */ -int -xfs_unmount_flush( - xfs_mount_t *mp, /* Mount structure we are getting - rid of. */ - int relocation) /* Called from vfs relocation. */ -{ - xfs_inode_t *rip = mp->m_rootip; - xfs_inode_t *rbmip; - xfs_inode_t *rsumip = NULL; - int error; - - xfs_ilock(rip, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT); - xfs_iflock(rip); - - /* - * Flush out the real time inodes. - */ - if ((rbmip = mp->m_rbmip) != NULL) { - xfs_ilock(rbmip, XFS_ILOCK_EXCL); - xfs_iflock(rbmip); - error = xfs_iflush(rbmip, XFS_IFLUSH_SYNC); - xfs_iunlock(rbmip, XFS_ILOCK_EXCL); - - if (error == EFSCORRUPTED) - goto fscorrupt_out; - - ASSERT(vn_count(VFS_I(rbmip)) == 1); - - rsumip = mp->m_rsumip; - xfs_ilock(rsumip, XFS_ILOCK_EXCL); - xfs_iflock(rsumip); - error = xfs_iflush(rsumip, XFS_IFLUSH_SYNC); - xfs_iunlock(rsumip, XFS_ILOCK_EXCL); - - if (error == EFSCORRUPTED) - goto fscorrupt_out; - - ASSERT(vn_count(VFS_I(rsumip)) == 1); - } - - /* - * Synchronously flush root inode to disk - */ - error = xfs_iflush(rip, XFS_IFLUSH_SYNC); - if (error == EFSCORRUPTED) - goto fscorrupt_out2; - - if (vn_count(VFS_I(rip)) != 1 && !relocation) { - xfs_iunlock(rip, XFS_ILOCK_EXCL); - return XFS_ERROR(EBUSY); - } - - /* - * Release dquot that rootinode, rbmino and rsumino might be holding, - * flush and purge the quota inodes. - */ - error = XFS_QM_UNMOUNT(mp); - if (error == EFSCORRUPTED) - goto fscorrupt_out2; - - if (rbmip) { - IRELE(rbmip); - IRELE(rsumip); - } - - xfs_iunlock(rip, XFS_ILOCK_EXCL); - return 0; - -fscorrupt_out: - xfs_ifunlock(rip); - -fscorrupt_out2: - xfs_iunlock(rip, XFS_ILOCK_EXCL); - - return XFS_ERROR(EFSCORRUPTED); -} - -/* - * xfs_sync flushes any pending I/O to file system vfsp. - * - * This routine is called by vfs_sync() to make sure that things make it - * out to disk eventually, on sync() system calls to flush out everything, - * and when the file system is unmounted. For the vfs_sync() case, all - * we really need to do is sync out the log to make all of our meta-data - * updates permanent (except for timestamps). For calls from pflushd(), - * dirty pages are kept moving by calling pdflush() on the inodes - * containing them. We also flush the inodes that we can lock without - * sleeping and the superblock if we can lock it without sleeping from - * vfs_sync() so that items at the tail of the log are always moving out. - * - * Flags: - * SYNC_BDFLUSH - We're being called from vfs_sync() so we don't want - * to sleep if we can help it. All we really need - * to do is ensure that the log is synced at least - * periodically. We also push the inodes and - * superblock if we can lock them without sleeping - * and they are not pinned. - * SYNC_ATTR - We need to flush the inodes. If SYNC_BDFLUSH is not - * set, then we really want to lock each inode and flush - * it. - * SYNC_WAIT - All the flushes that take place in this call should - * be synchronous. - * SYNC_DELWRI - This tells us to push dirty pages associated with - * inodes. SYNC_WAIT and SYNC_BDFLUSH are used to - * determine if they should be flushed sync, async, or - * delwri. - * SYNC_CLOSE - This flag is passed when the system is being - * unmounted. We should sync and invalidate everything. - * SYNC_FSDATA - This indicates that the caller would like to make - * sure the superblock is safe on disk. We can ensure - * this by simply making sure the log gets flushed - * if SYNC_BDFLUSH is set, and by actually writing it - * out otherwise. - * SYNC_IOWAIT - The caller wants us to wait for all data I/O to complete - * before we return (including direct I/O). Forms the drain - * side of the write barrier needed to safely quiesce the - * filesystem. - * - */ -int -xfs_sync( - xfs_mount_t *mp, - int flags) -{ - int error; - - /* - * Get the Quota Manager to flush the dquots. - * - * If XFS quota support is not enabled or this filesystem - * instance does not use quotas XFS_QM_DQSYNC will always - * return zero. - */ - error = XFS_QM_DQSYNC(mp, flags); - if (error) { - /* - * If we got an IO error, we will be shutting down. - * So, there's nothing more for us to do here. - */ - ASSERT(error != EIO || XFS_FORCED_SHUTDOWN(mp)); - if (XFS_FORCED_SHUTDOWN(mp)) - return XFS_ERROR(error); - } - - if (flags & SYNC_IOWAIT) - xfs_filestream_flush(mp); - - return xfs_syncsub(mp, flags, NULL); -} - -/* - * 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. - * - */ -int -xfs_sync_inodes( - xfs_mount_t *mp, - int flags, - int *bypassed) -{ - xfs_inode_t *ip = NULL; - struct inode *vp = NULL; - 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_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 - - ASSERT(!(flags & SYNC_BDFLUSH)); - - if (bypassed) - *bypassed = 0; - if (mp->m_flags & XFS_MOUNT_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_DELWRI) - 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 = VFS_I(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 (VN_BAD(vp)) { - ip = ip->i_mnext; - continue; - } - - if (XFS_FORCED_SHUTDOWN(mp) && !(flags & SYNC_CLOSE)) { - XFS_MOUNT_IUNLOCK(mp); - kmem_free(ipointer); - return 0; - } - - /* - * 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. - */ - if (xfs_ilock_nowait(ip, lock_flags) == 0) { - if (vp == NULL) { - ip = ip->i_mnext; - continue; - } - - vp = vn_grab(vp); - if (vp == NULL) { - ip = ip->i_mnext; - continue; - } - - IPOINTER_INSERT(ip, mp); - xfs_ilock(ip, lock_flags); - - ASSERT(vp == VFS_I(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 we have to flush data or wait for I/O completion - * we need to drop the ilock that we currently hold. - * If we need to drop the lock, insert a marker if we - * have not already done so. - */ - if ((flags & (SYNC_CLOSE|SYNC_IOWAIT)) || - ((flags & SYNC_DELWRI) && VN_DIRTY(vp))) { - if (mount_locked) { - IPOINTER_INSERT(ip, mp); - } - xfs_iunlock(ip, XFS_ILOCK_SHARED); - - if (flags & SYNC_CLOSE) { - /* Shutdown case. Flush and invalidate. */ - if (XFS_FORCED_SHUTDOWN(mp)) - xfs_tosspages(ip, 0, -1, - FI_REMAPF); - else - error = xfs_flushinval_pages(ip, - 0, -1, FI_REMAPF); - } else if ((flags & SYNC_DELWRI) && VN_DIRTY(vp)) { - error = xfs_flush_pages(ip, 0, - -1, fflag, FI_NONE); - } - - /* - * When freezing, we need to wait ensure all I/O (including direct - * I/O) is complete to ensure no further data modification can take - * place after this point - */ - if (flags & SYNC_IOWAIT) - vn_iowait(ip); - - xfs_ilock(ip, XFS_ILOCK_SHARED); - } - - if ((flags & SYNC_ATTR) && - (ip->i_update_core || - (ip->i_itemp && ip->i_itemp->ili_format.ilf_fields))) { - if (mount_locked) - IPOINTER_INSERT(ip, mp); - - if (flags & SYNC_WAIT) { - xfs_iflock(ip); - error = xfs_iflush(ip, XFS_IFLUSH_SYNC); - - /* - * 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. - */ - } else 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 IRELE() calls xfs_inactive(). - * - * Make sure to drop the mount lock before calling - * IRELE() 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); - } - - IRELE(ip); - - 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); - 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); - return XFS_ERROR(last_error); -} - -/* - * 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. - * - */ -int -xfs_syncsub( - xfs_mount_t *mp, - int flags, - int *bypassed) -{ - int error = 0; - int last_error = 0; - uint log_flags = XFS_LOG_FORCE; - xfs_buf_t *bp; - xfs_buf_log_item_t *bip; - - /* - * Sync out the log. This ensures that the log is periodically - * flushed even if there is not enough activity to fill it up. - */ - if (flags & SYNC_WAIT) - log_flags |= XFS_LOG_SYNC; - - xfs_log_force(mp, (xfs_lsn_t)0, log_flags); - - if (flags & (SYNC_ATTR|SYNC_DELWRI)) { - if (flags & SYNC_BDFLUSH) - xfs_finish_reclaim_all(mp, 1); - else - error = xfs_sync_inodes(mp, flags, bypassed); - } - - /* - * Flushing out dirty data above probably generated more - * log activity, so if this isn't vfs_sync() then flush - * the log again. - */ - if (flags & SYNC_DELWRI) { - xfs_log_force(mp, (xfs_lsn_t)0, log_flags); - } - - if (flags & SYNC_FSDATA) { - /* - * If this is vfs_sync() then only sync the superblock - * if we can lock it without sleeping and it is not pinned. - */ - if (flags & SYNC_BDFLUSH) { - bp = xfs_getsb(mp, XFS_BUF_TRYLOCK); - if (bp != NULL) { - bip = XFS_BUF_FSPRIVATE(bp,xfs_buf_log_item_t*); - if ((bip != NULL) && - xfs_buf_item_dirty(bip)) { - if (!(XFS_BUF_ISPINNED(bp))) { - XFS_BUF_ASYNC(bp); - error = xfs_bwrite(mp, bp); - } else { - xfs_buf_relse(bp); - } - } else { - xfs_buf_relse(bp); - } - } - } else { - bp = xfs_getsb(mp, 0); - /* - * If the buffer is pinned then push on the log so - * we won't get stuck waiting in the write for - * someone, maybe ourselves, to flush the log. - * Even though we just pushed the log above, we - * did not have the superblock buffer locked at - * that point so it can become pinned in between - * there and here. - */ - if (XFS_BUF_ISPINNED(bp)) - xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE); - if (flags & SYNC_WAIT) - XFS_BUF_UNASYNC(bp); - else - XFS_BUF_ASYNC(bp); - error = xfs_bwrite(mp, bp); - } - if (error) { - last_error = error; - } - } - - /* - * Now check to see if the log needs a "dummy" transaction. - */ - if (!(flags & SYNC_REMOUNT) && xfs_log_need_covered(mp)) { - xfs_trans_t *tp; - xfs_inode_t *ip; - - /* - * Put a dummy transaction in the log to tell - * recovery that all others are OK. - */ - tp = xfs_trans_alloc(mp, XFS_TRANS_DUMMY1); - if ((error = xfs_trans_reserve(tp, 0, - XFS_ICHANGE_LOG_RES(mp), - 0, 0, 0))) { - xfs_trans_cancel(tp, 0); - return error; - } - - ip = mp->m_rootip; - xfs_ilock(ip, XFS_ILOCK_EXCL); - - xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); - xfs_trans_ihold(tp, ip); - xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); - error = xfs_trans_commit(tp, 0); - xfs_iunlock(ip, XFS_ILOCK_EXCL); - xfs_log_force(mp, (xfs_lsn_t)0, log_flags); - } - - /* - * When shutting down, we need to insure that the AIL is pushed - * to disk or the filesystem can appear corrupt from the PROM. - */ - if ((flags & (SYNC_CLOSE|SYNC_WAIT)) == (SYNC_CLOSE|SYNC_WAIT)) { - XFS_bflush(mp->m_ddev_targp); - if (mp->m_rtdev_targp) { - XFS_bflush(mp->m_rtdev_targp); - } - } - - return XFS_ERROR(last_error); -} |