diff options
Diffstat (limited to 'fs/xfs/xfs_vfsops.c')
| -rw-r--r-- | fs/xfs/xfs_vfsops.c | 1941 |
1 files changed, 1941 insertions, 0 deletions
diff --git a/fs/xfs/xfs_vfsops.c b/fs/xfs/xfs_vfsops.c new file mode 100644 index 00000000000..00aae9c6a90 --- /dev/null +++ b/fs/xfs/xfs_vfsops.c @@ -0,0 +1,1941 @@ +/* + * XFS filesystem operations. + * + * 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 + * 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_dir.h" +#include "xfs_dir2.h" +#include "xfs_dmapi.h" +#include "xfs_mount.h" +#include "xfs_bmap_btree.h" +#include "xfs_ialloc_btree.h" +#include "xfs_alloc_btree.h" +#include "xfs_btree.h" +#include "xfs_alloc.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_ag.h" +#include "xfs_error.h" +#include "xfs_bmap.h" +#include "xfs_da_btree.h" +#include "xfs_rw.h" +#include "xfs_refcache.h" +#include "xfs_buf_item.h" +#include "xfs_extfree_item.h" +#include "xfs_quota.h" +#include "xfs_dir2_trace.h" +#include "xfs_acl.h" +#include "xfs_attr.h" +#include "xfs_clnt.h" +#include "xfs_log_priv.h" + +STATIC int xfs_sync(bhv_desc_t *, int, cred_t *); + +int +xfs_init(void) +{ + extern kmem_zone_t *xfs_bmap_free_item_zone; + extern kmem_zone_t *xfs_btree_cur_zone; + extern kmem_zone_t *xfs_trans_zone; + extern kmem_zone_t *xfs_buf_item_zone; + extern kmem_zone_t *xfs_dabuf_zone; +#ifdef XFS_DABUF_DEBUG + extern lock_t xfs_dabuf_global_lock; + spinlock_init(&xfs_dabuf_global_lock, "xfsda"); +#endif + + /* + * Initialize all of the zone allocators we use. + */ + xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t), + "xfs_bmap_free_item"); + xfs_btree_cur_zone = kmem_zone_init(sizeof(xfs_btree_cur_t), + "xfs_btree_cur"); + xfs_inode_zone = kmem_zone_init(sizeof(xfs_inode_t), "xfs_inode"); + xfs_trans_zone = kmem_zone_init(sizeof(xfs_trans_t), "xfs_trans"); + xfs_da_state_zone = + kmem_zone_init(sizeof(xfs_da_state_t), "xfs_da_state"); + xfs_dabuf_zone = kmem_zone_init(sizeof(xfs_dabuf_t), "xfs_dabuf"); + + /* + * The size of the zone allocated buf log item is the maximum + * size possible under XFS. This wastes a little bit of memory, + * but it is much faster. + */ + xfs_buf_item_zone = + kmem_zone_init((sizeof(xfs_buf_log_item_t) + + (((XFS_MAX_BLOCKSIZE / XFS_BLI_CHUNK) / + NBWORD) * sizeof(int))), + "xfs_buf_item"); + xfs_efd_zone = kmem_zone_init((sizeof(xfs_efd_log_item_t) + + ((XFS_EFD_MAX_FAST_EXTENTS - 1) * sizeof(xfs_extent_t))), + "xfs_efd_item"); + xfs_efi_zone = kmem_zone_init((sizeof(xfs_efi_log_item_t) + + ((XFS_EFI_MAX_FAST_EXTENTS - 1) * sizeof(xfs_extent_t))), + "xfs_efi_item"); + xfs_ifork_zone = kmem_zone_init(sizeof(xfs_ifork_t), "xfs_ifork"); + xfs_ili_zone = kmem_zone_init(sizeof(xfs_inode_log_item_t), "xfs_ili"); + xfs_chashlist_zone = kmem_zone_init(sizeof(xfs_chashlist_t), + "xfs_chashlist"); + xfs_acl_zone_init(xfs_acl_zone, "xfs_acl"); + + /* + * Allocate global trace buffers. + */ +#ifdef XFS_ALLOC_TRACE + xfs_alloc_trace_buf = ktrace_alloc(XFS_ALLOC_TRACE_SIZE, KM_SLEEP); +#endif +#ifdef XFS_BMAP_TRACE + xfs_bmap_trace_buf = ktrace_alloc(XFS_BMAP_TRACE_SIZE, KM_SLEEP); +#endif +#ifdef XFS_BMBT_TRACE + xfs_bmbt_trace_buf = ktrace_alloc(XFS_BMBT_TRACE_SIZE, KM_SLEEP); +#endif +#ifdef XFS_DIR_TRACE + xfs_dir_trace_buf = ktrace_alloc(XFS_DIR_TRACE_SIZE, KM_SLEEP); +#endif +#ifdef XFS_ATTR_TRACE + xfs_attr_trace_buf = ktrace_alloc(XFS_ATTR_TRACE_SIZE, KM_SLEEP); +#endif +#ifdef XFS_DIR2_TRACE + xfs_dir2_trace_buf = ktrace_alloc(XFS_DIR2_GTRACE_SIZE, KM_SLEEP); +#endif + + xfs_dir_startup(); + +#if (defined(DEBUG) || defined(INDUCE_IO_ERROR)) + xfs_error_test_init(); +#endif /* DEBUG || INDUCE_IO_ERROR */ + + xfs_init_procfs(); + xfs_sysctl_register(); + return 0; +} + +void +xfs_cleanup(void) +{ + extern kmem_zone_t *xfs_bmap_free_item_zone; + extern kmem_zone_t *xfs_btree_cur_zone; + extern kmem_zone_t *xfs_inode_zone; + extern kmem_zone_t *xfs_trans_zone; + extern kmem_zone_t *xfs_da_state_zone; + extern kmem_zone_t *xfs_dabuf_zone; + extern kmem_zone_t *xfs_efd_zone; + extern kmem_zone_t *xfs_efi_zone; + extern kmem_zone_t *xfs_buf_item_zone; + extern kmem_zone_t *xfs_chashlist_zone; + + xfs_cleanup_procfs(); + xfs_sysctl_unregister(); + xfs_refcache_destroy(); + xfs_acl_zone_destroy(xfs_acl_zone); + +#ifdef XFS_DIR2_TRACE + ktrace_free(xfs_dir2_trace_buf); +#endif +#ifdef XFS_ATTR_TRACE + ktrace_free(xfs_attr_trace_buf); +#endif +#ifdef XFS_DIR_TRACE + ktrace_free(xfs_dir_trace_buf); +#endif +#ifdef XFS_BMBT_TRACE + ktrace_free(xfs_bmbt_trace_buf); +#endif +#ifdef XFS_BMAP_TRACE + ktrace_free(xfs_bmap_trace_buf); +#endif +#ifdef XFS_ALLOC_TRACE + ktrace_free(xfs_alloc_trace_buf); +#endif + + kmem_cache_destroy(xfs_bmap_free_item_zone); + kmem_cache_destroy(xfs_btree_cur_zone); + kmem_cache_destroy(xfs_inode_zone); + kmem_cache_destroy(xfs_trans_zone); + kmem_cache_destroy(xfs_da_state_zone); + kmem_cache_destroy(xfs_dabuf_zone); + kmem_cache_destroy(xfs_buf_item_zone); + kmem_cache_destroy(xfs_efd_zone); + kmem_cache_destroy(xfs_efi_zone); + kmem_cache_destroy(xfs_ifork_zone); + kmem_cache_destroy(xfs_ili_zone); + kmem_cache_destroy(xfs_chashlist_zone); +} + +/* + * xfs_start_flags + * + * This function fills in xfs_mount_t fields based on mount args. + * Note: the superblock has _not_ yet been read in. + */ +STATIC int +xfs_start_flags( + struct vfs *vfs, + struct xfs_mount_args *ap, + struct xfs_mount *mp) +{ + /* Values are in BBs */ + if ((ap->flags & XFSMNT_NOALIGN) != XFSMNT_NOALIGN) { + /* + * At this point the superblock has not been read + * in, therefore we do not know the block size. + * Before the mount call ends we will convert + * these to FSBs. + */ + mp->m_dalign = ap->sunit; + mp->m_swidth = ap->swidth; + } + + if (ap->logbufs != -1 && +#if defined(DEBUG) || defined(XLOG_NOLOG) + ap->logbufs != 0 && +#endif + (ap->logbufs < XLOG_MIN_ICLOGS || + ap->logbufs > XLOG_MAX_ICLOGS)) { + cmn_err(CE_WARN, + "XFS: invalid logbufs value: %d [not %d-%d]", + ap->logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS); + return XFS_ERROR(EINVAL); + } + mp->m_logbufs = ap->logbufs; + if (ap->logbufsize != -1 && + ap->logbufsize != 16 * 1024 && + ap->logbufsize != 32 * 1024 && + ap->logbufsize != 64 * 1024 && + ap->logbufsize != 128 * 1024 && + ap->logbufsize != 256 * 1024) { + cmn_err(CE_WARN, + "XFS: invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]", + ap->logbufsize); + return XFS_ERROR(EINVAL); + } + mp->m_ihsize = ap->ihashsize; + mp->m_logbsize = ap->logbufsize; + mp->m_fsname_len = strlen(ap->fsname) + 1; + mp->m_fsname = kmem_alloc(mp->m_fsname_len, KM_SLEEP); + strcpy(mp->m_fsname, ap->fsname); + + if (ap->flags & XFSMNT_WSYNC) + mp->m_flags |= XFS_MOUNT_WSYNC; +#if XFS_BIG_INUMS + if (ap->flags & XFSMNT_INO64) { + mp->m_flags |= XFS_MOUNT_INO64; + mp->m_inoadd = XFS_INO64_OFFSET; + } +#endif + if (ap->flags & XFSMNT_NOATIME) + mp->m_flags |= XFS_MOUNT_NOATIME; + + if (ap->flags & XFSMNT_RETERR) + mp->m_flags |= XFS_MOUNT_RETERR; + + if (ap->flags & XFSMNT_NOALIGN) + mp->m_flags |= XFS_MOUNT_NOALIGN; + + if (ap->flags & XFSMNT_SWALLOC) + mp->m_flags |= XFS_MOUNT_SWALLOC; + + if (ap->flags & XFSMNT_OSYNCISOSYNC) + mp->m_flags |= XFS_MOUNT_OSYNCISOSYNC; + + if (ap->flags & XFSMNT_32BITINODES) + mp->m_flags |= (XFS_MOUNT_32BITINODES | XFS_MOUNT_32BITINOOPT); + + if (ap->flags & XFSMNT_IOSIZE) { + if (ap->iosizelog > XFS_MAX_IO_LOG || + ap->iosizelog < XFS_MIN_IO_LOG) { + cmn_err(CE_WARN, + "XFS: invalid log iosize: %d [not %d-%d]", + ap->iosizelog, XFS_MIN_IO_LOG, + XFS_MAX_IO_LOG); + return XFS_ERROR(EINVAL); + } + + mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE; + mp->m_readio_log = mp->m_writeio_log = ap->iosizelog; + } + + if (ap->flags & XFSMNT_IHASHSIZE) + mp->m_flags |= XFS_MOUNT_IHASHSIZE; + + if (ap->flags & XFSMNT_IDELETE) + mp->m_flags |= XFS_MOUNT_IDELETE; + + if (ap->flags & XFSMNT_DIRSYNC) + mp->m_flags |= XFS_MOUNT_DIRSYNC; + + /* + * no recovery flag requires a read-only mount + */ + if (ap->flags & XFSMNT_NORECOVERY) { + if (!(vfs->vfs_flag & VFS_RDONLY)) { + cmn_err(CE_WARN, + "XFS: tried to mount a FS read-write without recovery!"); + return XFS_ERROR(EINVAL); + } + mp->m_flags |= XFS_MOUNT_NORECOVERY; + } + + if (ap->flags & XFSMNT_NOUUID) + mp->m_flags |= XFS_MOUNT_NOUUID; + if (ap->flags & XFSMNT_NOLOGFLUSH) + mp->m_flags |= XFS_MOUNT_NOLOGFLUSH; + + return 0; +} + +/* + * This function fills in xfs_mount_t fields based on mount args. + * Note: the superblock _has_ now been read in. + */ +STATIC int +xfs_finish_flags( + struct vfs *vfs, + struct xfs_mount_args *ap, + struct xfs_mount *mp) +{ + int ronly = (vfs->vfs_flag & VFS_RDONLY); + + /* Fail a mount where the logbuf is smaller then the log stripe */ + if (XFS_SB_VERSION_HASLOGV2(&mp->m_sb)) { + if ((ap->logbufsize == -1) && + (mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE)) { + mp->m_logbsize = mp->m_sb.sb_logsunit; + } else if (ap->logbufsize < mp->m_sb.sb_logsunit) { + cmn_err(CE_WARN, + "XFS: logbuf size must be greater than or equal to log stripe size"); + return XFS_ERROR(EINVAL); + } + } else { + /* Fail a mount if the logbuf is larger than 32K */ + if (ap->logbufsize > XLOG_BIG_RECORD_BSIZE) { + cmn_err(CE_WARN, + "XFS: logbuf size for version 1 logs must be 16K or 32K"); + return XFS_ERROR(EINVAL); + } + } + + /* + * prohibit r/w mounts of read-only filesystems + */ + if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) { + cmn_err(CE_WARN, + "XFS: cannot mount a read-only filesystem as read-write"); + return XFS_ERROR(EROFS); + } + + /* + * disallow mount attempts with (IRIX) project quota enabled + */ + if (XFS_SB_VERSION_HASQUOTA(&mp->m_sb) && + (mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT)) { + cmn_err(CE_WARN, + "XFS: cannot mount a filesystem with IRIX project quota enabled"); + return XFS_ERROR(ENOSYS); + } + + /* + * check for shared mount. + */ + if (ap->flags & XFSMNT_SHARED) { + if (!XFS_SB_VERSION_HASSHARED(&mp->m_sb)) + return XFS_ERROR(EINVAL); + + /* + * For IRIX 6.5, shared mounts must have the shared + * version bit set, have the persistent readonly + * field set, must be version 0 and can only be mounted + * read-only. + */ + if (!ronly || !(mp->m_sb.sb_flags & XFS_SBF_READONLY) || + (mp->m_sb.sb_shared_vn != 0)) + return XFS_ERROR(EINVAL); + + mp->m_flags |= XFS_MOUNT_SHARED; + + /* + * Shared XFS V0 can't deal with DMI. Return EINVAL. + */ + if (mp->m_sb.sb_shared_vn == 0 && (ap->flags & XFSMNT_DMAPI)) + return XFS_ERROR(EINVAL); + } + + return 0; +} + +/* + * xfs_mount + * + * The file system configurations are: + * (1) device (partition) with data and internal log + * (2) logical volume with data and log subvolumes. + * (3) logical volume with data, log, and realtime subvolumes. + * + * We only have to handle opening the log and realtime volumes here if + * they are present. The data subvolume has already been opened by + * get_sb_bdev() and is stored in vfsp->vfs_super->s_bdev. + */ +STATIC int +xfs_mount( + struct bhv_desc *bhvp, + struct xfs_mount_args *args, + cred_t *credp) +{ + struct vfs *vfsp = bhvtovfs(bhvp); + struct bhv_desc *p; + struct xfs_mount *mp = XFS_BHVTOM(bhvp); + struct block_device *ddev, *logdev, *rtdev; + int flags = 0, error; + + ddev = vfsp->vfs_super->s_bdev; + logdev = rtdev = NULL; + + /* + * Setup xfs_mount function vectors from available behaviors + */ + p = vfs_bhv_lookup(vfsp, VFS_POSITION_DM); + mp->m_dm_ops = p ? *(xfs_dmops_t *) vfs_bhv_custom(p) : xfs_dmcore_stub; + p = vfs_bhv_lookup(vfsp, VFS_POSITION_QM); + mp->m_qm_ops = p ? *(xfs_qmops_t *) vfs_bhv_custom(p) : xfs_qmcore_stub; + p = vfs_bhv_lookup(vfsp, VFS_POSITION_IO); + mp->m_io_ops = p ? *(xfs_ioops_t *) vfs_bhv_custom(p) : xfs_iocore_xfs; + + /* + * Open real time and log devices - order is important. + */ + if (args->logname[0]) { + error = xfs_blkdev_get(mp, args->logname, &logdev); + if (error) + return error; + } + if (args->rtname[0]) { + error = xfs_blkdev_get(mp, args->rtname, &rtdev); + if (error) { + xfs_blkdev_put(logdev); + return error; + } + + if (rtdev == ddev || rtdev == logdev) { + cmn_err(CE_WARN, + "XFS: Cannot mount filesystem with identical rtdev and ddev/logdev."); + xfs_blkdev_put(logdev); + xfs_blkdev_put(rtdev); + return EINVAL; + } + } + + /* + * Setup xfs_mount buffer target pointers + */ + error = ENOMEM; + mp->m_ddev_targp = xfs_alloc_buftarg(ddev, 0); + if (!mp->m_ddev_targp) { + xfs_blkdev_put(logdev); + xfs_blkdev_put(rtdev); + return error; + } + if (rtdev) { + mp->m_rtdev_targp = xfs_alloc_buftarg(rtdev, 1); + if (!mp->m_rtdev_targp) + goto error0; + } + mp->m_logdev_targp = (logdev && logdev != ddev) ? + xfs_alloc_buftarg(logdev, 1) : mp->m_ddev_targp; + if (!mp->m_logdev_targp) + goto error0; + + /* + * Setup flags based on mount(2) options and then the superblock + */ + error = xfs_start_flags(vfsp, args, mp); + if (error) + goto error1; + error = xfs_readsb(mp); + if (error) + goto error1; + error = xfs_finish_flags(vfsp, args, mp); + if (error) + goto error2; + + /* + * Setup xfs_mount buffer target pointers based on superblock + */ + error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize, + mp->m_sb.sb_sectsize); + if (!error && logdev && logdev != ddev) { + unsigned int log_sector_size = BBSIZE; + + if (XFS_SB_VERSION_HASSECTOR(&mp->m_sb)) + log_sector_size = mp->m_sb.sb_logsectsize; + error = xfs_setsize_buftarg(mp->m_logdev_targp, + mp->m_sb.sb_blocksize, + log_sector_size); + } + if (!error && rtdev) + error = xfs_setsize_buftarg(mp->m_rtdev_targp, + mp->m_sb.sb_blocksize, + mp->m_sb.sb_sectsize); + if (error) + goto error2; + + error = XFS_IOINIT(vfsp, args, flags); + if (!error) + return 0; +error2: + if (mp->m_sb_bp) + xfs_freesb(mp); +error1: + xfs_binval(mp->m_ddev_targp); + if (logdev && logdev != ddev) + xfs_binval(mp->m_logdev_targp); + if (rtdev) + xfs_binval(mp->m_rtdev_targp); +error0: + xfs_unmountfs_close(mp, credp); + return error; +} + +STATIC int +xfs_unmount( + bhv_desc_t *bdp, + int flags, + cred_t *credp) +{ + struct vfs *vfsp = bhvtovfs(bdp); + xfs_mount_t *mp = XFS_BHVTOM(bdp); + xfs_inode_t *rip; + vnode_t *rvp; + int unmount_event_wanted = 0; + int unmount_event_flags = 0; + int xfs_unmountfs_needed = 0; + int error; + + rip = mp->m_rootip; + rvp = XFS_ITOV(rip); + + if (vfsp->vfs_flag & VFS_DMI) { + error = XFS_SEND_PREUNMOUNT(mp, vfsp, + rvp, DM_RIGHT_NULL, rvp, DM_RIGHT_NULL, + NULL, NULL, 0, 0, + (mp->m_dmevmask & (1<<DM_EVENT_PREUNMOUNT))? + 0:DM_FLAGS_UNWANTED); + if (error) + return XFS_ERROR(error); + unmount_event_wanted = 1; + unmount_event_flags = (mp->m_dmevmask & (1<<DM_EVENT_UNMOUNT))? + 0 : DM_FLAGS_UNWANTED; + } + + /* + * First blow any referenced inode from this file system + * out of the reference cache, and delete the timer. + */ + xfs_refcache_purge_mp(mp); + + XFS_bflush(mp->m_ddev_targp); + error = xfs_unmount_flush(mp, 0); + if (error) + goto out; + + ASSERT(vn_count(rvp) == 1); + + /* + * Drop the reference count + */ + VN_RELE(rvp); + + /* + * If we're forcing a shutdown, typically because of a media error, + * we want to make sure we invalidate dirty pages that belong to + * referenced vnodes as well. + */ + if (XFS_FORCED_SHUTDOWN(mp)) { + error = xfs_sync(&mp->m_bhv, + (SYNC_WAIT | SYNC_CLOSE), credp); + ASSERT(error != EFSCORRUPTED); + } + xfs_unmountfs_needed = 1; + +out: + /* Send DMAPI event, if required. + * Then do xfs_unmountfs() if needed. + * Then return error (or zero). + */ + if (unmount_event_wanted) { + /* Note: mp structure must still exist for + * XFS_SEND_UNMOUNT() call. + */ + XFS_SEND_UNMOUNT(mp, vfsp, error == 0 ? rvp : NULL, + DM_RIGHT_NULL, 0, error, unmount_event_flags); + } + if (xfs_unmountfs_needed) { + /* + * Call common unmount function to flush to disk + * and free the super block buffer & mount structures. + */ + xfs_unmountfs(mp, credp); + } + + return XFS_ERROR(error); +} + +#define REMOUNT_READONLY_FLAGS (SYNC_REMOUNT|SYNC_ATTR|SYNC_WAIT) + +STATIC int +xfs_mntupdate( + bhv_desc_t *bdp, + int *flags, + struct xfs_mount_args *args) +{ + struct vfs *vfsp = bhvtovfs(bdp); + xfs_mount_t *mp = XFS_BHVTOM(bdp); + int pincount, error; + int count = 0; + + if (args->flags & XFSMNT_NOATIME) + mp->m_flags |= XFS_MOUNT_NOATIME; + else + mp->m_flags &= ~XFS_MOUNT_NOATIME; + + if (!(vfsp->vfs_flag & VFS_RDONLY)) { + VFS_SYNC(vfsp, SYNC_FSDATA|SYNC_BDFLUSH|SYNC_ATTR, NULL, error); + } + + if (*flags & MS_RDONLY) { + xfs_refcache_purge_mp(mp); + 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 { + VFS_SYNC(vfsp, REMOUNT_READONLY_FLAGS, NULL, error); + pincount = xfs_flush_buftarg(mp->m_ddev_targp, 1); + if (!pincount) { + delay(50); + count++; + } + } while (count < 2); + + /* Ok now write out an unmount record */ + xfs_log_unmount_write(mp); + xfs_unmountfs_writesb(mp); + vfsp->vfs_flag |= VFS_RDONLY; + } else { + vfsp->vfs_flag &= ~VFS_RDONLY; + } + + return 0; +} + +/* + * 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; + vnode_t *rvp = XFS_ITOV(rip); + int error; + + xfs_ilock(rip, XFS_ILOCK_EXCL); + 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(XFS_ITOV(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(XFS_ITOV(rsumip)) == 1); + } + + /* + * Synchronously flush root inode to disk + */ + error = xfs_iflush(rip, XFS_IFLUSH_SYNC); + if (error == EFSCORRUPTED) + goto fscorrupt_out2; + + if (vn_count(rvp) != 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) { + VN_RELE(XFS_ITOV(rbmip)); + VN_RELE(XFS_ITOV(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_root extracts the root vnode from a vfs. + * + * vfsp -- the vfs struct for the desired file system + * vpp -- address of the caller's vnode pointer which should be + * set to the desired fs root vnode + */ +STATIC int +xfs_root( + bhv_desc_t *bdp, + vnode_t **vpp) +{ + vnode_t *vp; + + vp = XFS_ITOV((XFS_BHVTOM(bdp))->m_rootip); + VN_HOLD(vp); + *vpp = vp; + return 0; +} + +/* + * xfs_statvfs + * + * Fill in the statvfs structure for the given file system. We use + * the superblock lock in the mount structure to ensure a consistent + * snapshot of the counters returned. + */ +STATIC int +xfs_statvfs( + bhv_desc_t *bdp, + xfs_statfs_t *statp, + vnode_t *vp) +{ + __uint64_t fakeinos; + xfs_extlen_t lsize; + xfs_mount_t *mp; + xfs_sb_t *sbp; + unsigned long s; + u64 id; + + mp = XFS_BHVTOM(bdp); + sbp = &(mp->m_sb); + + statp->f_type = XFS_SB_MAGIC; + + s = XFS_SB_LOCK(mp); + statp->f_bsize = sbp->sb_blocksize; + lsize = sbp->sb_logstart ? sbp->sb_logblocks : 0; + statp->f_blocks = sbp->sb_dblocks - lsize; + statp->f_bfree = statp->f_bavail = sbp->sb_fdblocks; + fakeinos = statp->f_bfree << sbp->sb_inopblog; +#if XFS_BIG_INUMS + fakeinos += mp->m_inoadd; +#endif + statp->f_files = + MIN(sbp->sb_icount + fakeinos, (__uint64_t)XFS_MAXINUMBER); + if (mp->m_maxicount) +#if XFS_BIG_INUMS + if (!mp->m_inoadd) +#endif + statp->f_files = min_t(typeof(statp->f_files), + statp->f_files, + mp->m_maxicount); + statp->f_ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree); + XFS_SB_UNLOCK(mp, s); + + id = huge_encode_dev(mp->m_dev); + statp->f_fsid.val[0] = (u32)id; + statp->f_fsid.val[1] = (u32)(id >> 32); + statp->f_namelen = MAXNAMELEN - 1; + + return 0; +} + + +/* + * 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 everthing. + * SYNC_FSDATA - This indicates that the caller would like to make + * sure the superblock is safe on disk. We can ensure + * this by simply makeing sure the log gets flushed + * if SYNC_BDFLUSH is set, and by actually writing it + * out otherwise. + * + */ +/*ARGSUSED*/ +STATIC int +xfs_sync( + bhv_desc_t *bdp, + int flags, + cred_t *credp) +{ + xfs_mount_t *mp; + + mp = XFS_BHVTOM(bdp); + return (xfs_syncsub(mp, flags, 0, 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. 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 (VN_BAD(vp)) { + 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); +} + +/* + * 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. + * + */ +int +xfs_syncsub( + xfs_mount_t *mp, + int flags, + int xflags, + 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, xflags, 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; + } + } + + /* + * If this is the periodic sync, then kick some entries out of + * the reference cache. This ensures that idle entries are + * eventually kicked out of the cache. + */ + if (flags & SYNC_REFCACHE) { + xfs_refcache_purge_some(mp); + } + + /* + * 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, NULL); + 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); +} + +/* + * xfs_vget - called by DMAPI and NFSD to get vnode from file handle + */ +STATIC int +xfs_vget( + bhv_desc_t *bdp, + vnode_t **vpp, + fid_t *fidp) +{ + xfs_mount_t *mp = XFS_BHVTOM(bdp); + xfs_fid_t *xfid = (struct xfs_fid *)fidp; + xfs_inode_t *ip; + int error; + xfs_ino_t ino; + unsigned int igen; + + /* + * Invalid. Since handles can be created in user space and passed in + * via gethandle(), this is not cause for a panic. + */ + if (xfid->xfs_fid_len != sizeof(*xfid) - sizeof(xfid->xfs_fid_len)) + return XFS_ERROR(EINVAL); + + ino = xfid->xfs_fid_ino; + igen = xfid->xfs_fid_gen; + + /* + * NFS can sometimes send requests for ino 0. Fail them gracefully. + */ + if (ino == 0) + return XFS_ERROR(ESTALE); + + error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, 0); + if (error) { + *vpp = NULL; + return error; + } + + if (ip == NULL) { + *vpp = NULL; + return XFS_ERROR(EIO); + } + + if (ip->i_d.di_mode == 0 || ip->i_d.di_gen != igen) { + xfs_iput_new(ip, XFS_ILOCK_SHARED); + *vpp = NULL; + return XFS_ERROR(ENOENT); + } + + *vpp = XFS_ITOV(ip); + xfs_iunlock(ip, XFS_ILOCK_SHARED); + return 0; +} + + +#define MNTOPT_LOGBUFS "logbufs" /* number of XFS log buffers */ +#define MNTOPT_LOGBSIZE "logbsize" /* size of XFS log buffers */ +#define MNTOPT_LOGDEV "logdev" /* log device */ +#define MNTOPT_RTDEV "rtdev" /* realtime I/O device */ +#define MNTOPT_BIOSIZE "biosize" /* log2 of preferred buffered io size */ +#define MNTOPT_WSYNC "wsync" /* safe-mode nfs compatible mount */ +#define MNTOPT_INO64 "ino64" /* force inodes into 64-bit range */ +#define MNTOPT_NOALIGN "noalign" /* turn off stripe alignment */ +#define MNTOPT_SWALLOC "swalloc" /* turn on stripe width allocation */ +#define MNTOPT_SUNIT "sunit" /* data volume stripe unit */ +#define MNTOPT_SWIDTH "swidth" /* data volume stripe width */ +#define MNTOPT_NOUUID "nouuid" /* ignore filesystem UUID */ +#define MNTOPT_MTPT "mtpt" /* filesystem mount point */ +#define MNTOPT_IHASHSIZE "ihashsize" /* size of inode hash table */ +#define MNTOPT_NORECOVERY "norecovery" /* don't run XFS recovery */ +#define MNTOPT_NOLOGFLUSH "nologflush" /* don't hard flush on log writes */ +#define MNTOPT_OSYNCISOSYNC "osyncisosync" /* o_sync is REALLY o_sync */ +#define MNTOPT_64BITINODE "inode64" /* inodes can be allocated anywhere */ +#define MNTOPT_IKEEP "ikeep" /* do not free empty inode clusters */ +#define MNTOPT_NOIKEEP "noikeep" /* free empty inode clusters */ + + +int +xfs_parseargs( + struct bhv_desc *bhv, + char *options, + struct xfs_mount_args *args, + int update) +{ + struct vfs *vfsp = bhvtovfs(bhv); + char *this_char, *value, *eov; + int dsunit, dswidth, vol_dsunit, vol_dswidth; + int iosize; + +#if 0 /* XXX: off by default, until some remaining issues ironed out */ + args->flags |= XFSMNT_IDELETE; /* default to on */ +#endif + + if (!options) + return 0; + + iosize = dsunit = dswidth = vol_dsunit = vol_dswidth = 0; + + while ((this_char = strsep(&options, ",")) != NULL) { + if (!*this_char) + continue; + if ((value = strchr(this_char, '=')) != NULL) + *value++ = 0; + + if (!strcmp(this_char, MNTOPT_LOGBUFS)) { + if (!value || !*value) { + printk("XFS: %s option requires an argument\n", + MNTOPT_LOGBUFS); + return EINVAL; + } + args->logbufs = simple_strtoul(value, &eov, 10); + } else if (!strcmp(this_char, MNTOPT_LOGBSIZE)) { + int last, in_kilobytes = 0; + + if (!value || !*value) { + printk("XFS: %s option requires an argument\n", + MNTOPT_LOGBSIZE); + return EINVAL; + } + last = strlen(value) - 1; + if (value[last] == 'K' || value[last] == 'k') { + in_kilobytes = 1; + value[last] = '\0'; + } + args->logbufsize = simple_strtoul(value, &eov, 10); + if (in_kilobytes) + args->logbufsize <<= 10; + } else if (!strcmp(this_char, MNTOPT_LOGDEV)) { + if (!value || !*value) { + printk("XFS: %s option requires an argument\n", + MNTOPT_LOGDEV); + return EINVAL; + } + strncpy(args->logname, value, MAXNAMELEN); + } else if (!strcmp(this_char, MNTOPT_MTPT)) { + if (!value || !*value) { + printk("XFS: %s option requires an argument\n", + MNTOPT_MTPT); + return EINVAL; + } + strncpy(args->mtpt, value, MAXNAMELEN); + } else if (!strcmp(this_char, MNTOPT_RTDEV)) { + if (!value || !*value) { + printk("XFS: %s option requires an argument\n", + MNTOPT_RTDEV); + return EINVAL; + } + strncpy(args->rtname, value, MAXNAMELEN); + } else if (!strcmp(this_char, MNTOPT_BIOSIZE)) { + if (!value || !*value) { + printk("XFS: %s option requires an argument\n", + MNTOPT_BIOSIZE); + return EINVAL; + } + iosize = simple_strtoul(value, &eov, 10); + args->flags |= XFSMNT_IOSIZE; + args->iosizelog = (uint8_t) iosize; + } else if (!strcmp(this_char, MNTOPT_IHASHSIZE)) { + if (!value || !*value) { + printk("XFS: %s option requires an argument\n", + this_char); + return EINVAL; + } + args->flags |= XFSMNT_IHASHSIZE; + args->ihashsize = simple_strtoul(value, &eov, 10); + } else if (!strcmp(this_char, MNTOPT_WSYNC)) { + args->flags |= XFSMNT_WSYNC; + } else if (!strcmp(this_char, MNTOPT_OSYNCISOSYNC)) { + args->flags |= XFSMNT_OSYNCISOSYNC; + } else if (!strcmp(this_char, MNTOPT_NORECOVERY)) { + args->flags |= XFSMNT_NORECOVERY; + } else if (!strcmp(this_char, MNTOPT_INO64)) { + args->flags |= XFSMNT_INO64; +#if !XFS_BIG_INUMS + printk("XFS: %s option not allowed on this system\n", + MNTOPT_INO64); + return EINVAL; +#endif + } else if (!strcmp(this_char, MNTOPT_NOALIGN)) { + args->flags |= XFSMNT_NOALIGN; + } else if (!strcmp(this_char, MNTOPT_SWALLOC)) { + args->flags |= XFSMNT_SWALLOC; + } else if (!strcmp(this_char, MNTOPT_SUNIT)) { + if (!value || !*value) { + printk("XFS: %s option requires an argument\n", + MNTOPT_SUNIT); + return EINVAL; + } + dsunit = simple_strtoul(value, &eov, 10); + } else if (!strcmp(this_char, MNTOPT_SWIDTH)) { + if (!value || !*value) { + printk("XFS: %s option requires an argument\n", + MNTOPT_SWIDTH); + return EINVAL; + } + dswidth = simple_strtoul(value, &eov, 10); + } else if (!strcmp(this_char, MNTOPT_64BITINODE)) { + args->flags &= ~XFSMNT_32BITINODES; +#if !XFS_BIG_INUMS + printk("XFS: %s option not allowed on this system\n", + MNTOPT_64BITINODE); + return EINVAL; +#endif + } else if (!strcmp(this_char, MNTOPT_NOUUID)) { + args->flags |= XFSMNT_NOUUID; + } else if (!strcmp(this_char, MNTOPT_NOLOGFLUSH)) { + args->flags |= XFSMNT_NOLOGFLUSH; + } else if (!strcmp(this_char, MNTOPT_IKEEP)) { + args->flags &= ~XFSMNT_IDELETE; + } else if (!strcmp(this_char, MNTOPT_NOIKEEP)) { + args->flags |= XFSMNT_IDELETE; + } else if (!strcmp(this_char, "osyncisdsync")) { + /* no-op, this is now the default */ +printk("XFS: osyncisdsync is now the default, option is deprecated.\n"); + } else if (!strcmp(this_char, "irixsgid")) { +printk("XFS: irixsgid is now a sysctl(2) variable, option is deprecated.\n"); + } else { + printk("XFS: unknown mount option [%s].\n", this_char); + return EINVAL; + } + } + + if (args->flags & XFSMNT_NORECOVERY) { + if ((vfsp->vfs_flag & VFS_RDONLY) == 0) { + printk("XFS: no-recovery mounts must be read-only.\n"); + return EINVAL; + } + } + + if ((args->flags & XFSMNT_NOALIGN) && (dsunit || dswidth)) { + printk( + "XFS: sunit and swidth options incompatible with the noalign option\n"); + return EINVAL; + } + + if ((dsunit && !dswidth) || (!dsunit && dswidth)) { + printk("XFS: sunit and swidth must be specified together\n"); + return EINVAL; + } + + if (dsunit && (dswidth % dsunit != 0)) { + printk( + "XFS: stripe width (%d) must be a multiple of the stripe unit (%d)\n", + dswidth, dsunit); + return EINVAL; + } + + if ((args->flags & XFSMNT_NOALIGN) != XFSMNT_NOALIGN) { + if (dsunit) { + args->sunit = dsunit; + args->flags |= XFSMNT_RETERR; + } else { + args->sunit = vol_dsunit; + } + dswidth ? (args->swidth = dswidth) : + (args->swidth = vol_dswidth); + } else { + args->sunit = args->swidth = 0; + } + + return 0; +} + +int +xfs_showargs( + struct bhv_desc *bhv, + struct seq_file *m) +{ + static struct proc_xfs_info { + int flag; + char *str; + } xfs_info[] = { + /* the few simple ones we can get from the mount struct */ + { XFS_MOUNT_WSYNC, "," MNTOPT_WSYNC }, + { XFS_MOUNT_INO64, "," MNTOPT_INO64 }, + { XFS_MOUNT_NOALIGN, "," MNTOPT_NOALIGN }, + { XFS_MOUNT_SWALLOC, "," MNTOPT_SWALLOC }, + { XFS_MOUNT_NOUUID, "," MNTOPT_NOUUID }, + { XFS_MOUNT_NORECOVERY, "," MNTOPT_NORECOVERY }, + { XFS_MOUNT_OSYNCISOSYNC, "," MNTOPT_OSYNCISOSYNC }, + { XFS_MOUNT_NOLOGFLUSH, "," MNTOPT_NOLOGFLUSH }, + { XFS_MOUNT_IDELETE, "," MNTOPT_NOIKEEP }, + { 0, NULL } + }; + struct proc_xfs_info *xfs_infop; + struct xfs_mount *mp = XFS_BHVTOM(bhv); + + for (xfs_infop = xfs_info; xfs_infop->flag; xfs_infop++) { + if (mp->m_flags & xfs_infop->flag) + seq_puts(m, xfs_infop->str); + } + + if (mp->m_flags & XFS_MOUNT_IHASHSIZE) + seq_printf(m, "," MNTOPT_IHASHSIZE "=%d", mp->m_ihsize); + + if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) + seq_printf(m, "," MNTOPT_BIOSIZE "=%d", mp->m_writeio_log); + + if (mp->m_logbufs > 0) + seq_printf(m, "," MNTOPT_LOGBUFS "=%d", mp->m_logbufs); + + if (mp->m_logbsize > 0) + seq_printf(m, "," MNTOPT_LOGBSIZE "=%d", mp->m_logbsize); + + if (mp->m_ddev_targp != mp->m_logdev_targp) + seq_printf(m, "," MNTOPT_LOGDEV "=%s", + XFS_BUFTARG_NAME(mp->m_logdev_targp)); + + if (mp->m_rtdev_targp && mp->m_ddev_targp != mp->m_rtdev_targp) + seq_printf(m, "," MNTOPT_RTDEV "=%s", + XFS_BUFTARG_NAME(mp->m_rtdev_targp)); + + if (mp->m_dalign > 0) + seq_printf(m, "," MNTOPT_SUNIT "=%d", + (int)XFS_FSB_TO_BB(mp, mp->m_dalign)); + + if (mp->m_swidth > 0) + seq_printf(m, "," MNTOPT_SWIDTH "=%d", + (int)XFS_FSB_TO_BB(mp, mp->m_swidth)); + + if (!(mp->m_flags & XFS_MOUNT_32BITINOOPT)) + seq_printf(m, "," MNTOPT_64BITINODE); + + return 0; +} + +STATIC void +xfs_freeze( + bhv_desc_t *bdp) +{ + xfs_mount_t *mp = XFS_BHVTOM(bdp); + + while (atomic_read(&mp->m_active_trans) > 0) + delay(100); + + /* Push the superblock and write an unmount record */ + xfs_log_unmount_write(mp); + xfs_unmountfs_writesb(mp); +} + + +vfsops_t xfs_vfsops = { + BHV_IDENTITY_INIT(VFS_BHV_XFS,VFS_POSITION_XFS), + .vfs_parseargs = xfs_parseargs, + .vfs_showargs = xfs_showargs, + .vfs_mount = xfs_mount, + .vfs_unmount = xfs_unmount, + .vfs_mntupdate = xfs_mntupdate, + .vfs_root = xfs_root, + .vfs_statvfs = xfs_statvfs, + .vfs_sync = xfs_sync, + .vfs_vget = xfs_vget, + .vfs_dmapiops = (vfs_dmapiops_t)fs_nosys, + .vfs_quotactl = (vfs_quotactl_t)fs_nosys, + .vfs_init_vnode = xfs_initialize_vnode, + .vfs_force_shutdown = xfs_do_force_shutdown, + .vfs_freeze = xfs_freeze, +}; |