diff options
Diffstat (limited to 'fs/xfs/xfs_vnodeops.c')
| -rw-r--r-- | fs/xfs/xfs_vnodeops.c | 4424 |
1 files changed, 0 insertions, 4424 deletions
diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c deleted file mode 100644 index 51305242ff8..00000000000 --- a/fs/xfs/xfs_vnodeops.c +++ /dev/null @@ -1,4424 +0,0 @@ -/* - * Copyright (c) 2000-2006 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_alloc_btree.h" -#include "xfs_ialloc_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_itable.h" -#include "xfs_btree.h" -#include "xfs_ialloc.h" -#include "xfs_alloc.h" -#include "xfs_bmap.h" -#include "xfs_attr.h" -#include "xfs_rw.h" -#include "xfs_error.h" -#include "xfs_quota.h" -#include "xfs_utils.h" -#include "xfs_rtalloc.h" -#include "xfs_refcache.h" -#include "xfs_trans_space.h" -#include "xfs_log_priv.h" -#include "xfs_filestream.h" -#include "xfs_vnodeops.h" - -int -xfs_open( - xfs_inode_t *ip) -{ - int mode; - - if (XFS_FORCED_SHUTDOWN(ip->i_mount)) - return XFS_ERROR(EIO); - - /* - * If it's a directory with any blocks, read-ahead block 0 - * as we're almost certain to have the next operation be a read there. - */ - if (S_ISDIR(ip->i_d.di_mode) && ip->i_d.di_nextents > 0) { - mode = xfs_ilock_map_shared(ip); - if (ip->i_d.di_nextents > 0) - (void)xfs_da_reada_buf(NULL, ip, 0, XFS_DATA_FORK); - xfs_iunlock(ip, mode); - } - return 0; -} - -/* - * xfs_getattr - */ -int -xfs_getattr( - xfs_inode_t *ip, - bhv_vattr_t *vap, - int flags) -{ - bhv_vnode_t *vp = XFS_ITOV(ip); - xfs_mount_t *mp = ip->i_mount; - - xfs_itrace_entry(ip); - - if (XFS_FORCED_SHUTDOWN(mp)) - return XFS_ERROR(EIO); - - if (!(flags & ATTR_LAZY)) - xfs_ilock(ip, XFS_ILOCK_SHARED); - - vap->va_size = XFS_ISIZE(ip); - if (vap->va_mask == XFS_AT_SIZE) - goto all_done; - - vap->va_nblocks = - XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks); - vap->va_nodeid = ip->i_ino; -#if XFS_BIG_INUMS - vap->va_nodeid += mp->m_inoadd; -#endif - vap->va_nlink = ip->i_d.di_nlink; - - /* - * Quick exit for non-stat callers - */ - if ((vap->va_mask & - ~(XFS_AT_SIZE|XFS_AT_FSID|XFS_AT_NODEID| - XFS_AT_NLINK|XFS_AT_BLKSIZE)) == 0) - goto all_done; - - /* - * Copy from in-core inode. - */ - vap->va_mode = ip->i_d.di_mode; - vap->va_uid = ip->i_d.di_uid; - vap->va_gid = ip->i_d.di_gid; - vap->va_projid = ip->i_d.di_projid; - - /* - * Check vnode type block/char vs. everything else. - */ - switch (ip->i_d.di_mode & S_IFMT) { - case S_IFBLK: - case S_IFCHR: - vap->va_rdev = ip->i_df.if_u2.if_rdev; - vap->va_blocksize = BLKDEV_IOSIZE; - break; - default: - vap->va_rdev = 0; - - if (!(XFS_IS_REALTIME_INODE(ip))) { - vap->va_blocksize = xfs_preferred_iosize(mp); - } else { - - /* - * If the file blocks are being allocated from a - * realtime partition, then return the inode's - * realtime extent size or the realtime volume's - * extent size. - */ - vap->va_blocksize = - xfs_get_extsz_hint(ip) << mp->m_sb.sb_blocklog; - } - break; - } - - vn_atime_to_timespec(vp, &vap->va_atime); - vap->va_mtime.tv_sec = ip->i_d.di_mtime.t_sec; - vap->va_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec; - vap->va_ctime.tv_sec = ip->i_d.di_ctime.t_sec; - vap->va_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec; - - /* - * Exit for stat callers. See if any of the rest of the fields - * to be filled in are needed. - */ - if ((vap->va_mask & - (XFS_AT_XFLAGS|XFS_AT_EXTSIZE|XFS_AT_NEXTENTS|XFS_AT_ANEXTENTS| - XFS_AT_GENCOUNT|XFS_AT_VCODE)) == 0) - goto all_done; - - /* - * Convert di_flags to xflags. - */ - vap->va_xflags = xfs_ip2xflags(ip); - - /* - * Exit for inode revalidate. See if any of the rest of - * the fields to be filled in are needed. - */ - if ((vap->va_mask & - (XFS_AT_EXTSIZE|XFS_AT_NEXTENTS|XFS_AT_ANEXTENTS| - XFS_AT_GENCOUNT|XFS_AT_VCODE)) == 0) - goto all_done; - - vap->va_extsize = ip->i_d.di_extsize << mp->m_sb.sb_blocklog; - vap->va_nextents = - (ip->i_df.if_flags & XFS_IFEXTENTS) ? - ip->i_df.if_bytes / sizeof(xfs_bmbt_rec_t) : - ip->i_d.di_nextents; - if (ip->i_afp) - vap->va_anextents = - (ip->i_afp->if_flags & XFS_IFEXTENTS) ? - ip->i_afp->if_bytes / sizeof(xfs_bmbt_rec_t) : - ip->i_d.di_anextents; - else - vap->va_anextents = 0; - vap->va_gen = ip->i_d.di_gen; - - all_done: - if (!(flags & ATTR_LAZY)) - xfs_iunlock(ip, XFS_ILOCK_SHARED); - return 0; -} - - -/* - * xfs_setattr - */ -int -xfs_setattr( - xfs_inode_t *ip, - bhv_vattr_t *vap, - int flags, - cred_t *credp) -{ - bhv_vnode_t *vp = XFS_ITOV(ip); - xfs_mount_t *mp = ip->i_mount; - xfs_trans_t *tp; - int mask; - int code; - uint lock_flags; - uint commit_flags=0; - uid_t uid=0, iuid=0; - gid_t gid=0, igid=0; - int timeflags = 0; - xfs_prid_t projid=0, iprojid=0; - int mandlock_before, mandlock_after; - struct xfs_dquot *udqp, *gdqp, *olddquot1, *olddquot2; - int file_owner; - int need_iolock = 1; - - xfs_itrace_entry(ip); - - if (mp->m_flags & XFS_MOUNT_RDONLY) - return XFS_ERROR(EROFS); - - /* - * Cannot set certain attributes. - */ - mask = vap->va_mask; - if (mask & XFS_AT_NOSET) { - return XFS_ERROR(EINVAL); - } - - if (XFS_FORCED_SHUTDOWN(mp)) - return XFS_ERROR(EIO); - - /* - * Timestamps do not need to be logged and hence do not - * need to be done within a transaction. - */ - if (mask & XFS_AT_UPDTIMES) { - ASSERT((mask & ~XFS_AT_UPDTIMES) == 0); - timeflags = ((mask & XFS_AT_UPDATIME) ? XFS_ICHGTIME_ACC : 0) | - ((mask & XFS_AT_UPDCTIME) ? XFS_ICHGTIME_CHG : 0) | - ((mask & XFS_AT_UPDMTIME) ? XFS_ICHGTIME_MOD : 0); - xfs_ichgtime(ip, timeflags); - return 0; - } - - olddquot1 = olddquot2 = NULL; - udqp = gdqp = NULL; - - /* - * If disk quotas is on, we make sure that the dquots do exist on disk, - * before we start any other transactions. Trying to do this later - * is messy. We don't care to take a readlock to look at the ids - * in inode here, because we can't hold it across the trans_reserve. - * If the IDs do change before we take the ilock, we're covered - * because the i_*dquot fields will get updated anyway. - */ - if (XFS_IS_QUOTA_ON(mp) && - (mask & (XFS_AT_UID|XFS_AT_GID|XFS_AT_PROJID))) { - uint qflags = 0; - - if ((mask & XFS_AT_UID) && XFS_IS_UQUOTA_ON(mp)) { - uid = vap->va_uid; - qflags |= XFS_QMOPT_UQUOTA; - } else { - uid = ip->i_d.di_uid; - } - if ((mask & XFS_AT_GID) && XFS_IS_GQUOTA_ON(mp)) { - gid = vap->va_gid; - qflags |= XFS_QMOPT_GQUOTA; - } else { - gid = ip->i_d.di_gid; - } - if ((mask & XFS_AT_PROJID) && XFS_IS_PQUOTA_ON(mp)) { - projid = vap->va_projid; - qflags |= XFS_QMOPT_PQUOTA; - } else { - projid = ip->i_d.di_projid; - } - /* - * We take a reference when we initialize udqp and gdqp, - * so it is important that we never blindly double trip on - * the same variable. See xfs_create() for an example. - */ - ASSERT(udqp == NULL); - ASSERT(gdqp == NULL); - code = XFS_QM_DQVOPALLOC(mp, ip, uid, gid, projid, qflags, - &udqp, &gdqp); - if (code) - return code; - } - - /* - * For the other attributes, we acquire the inode lock and - * first do an error checking pass. - */ - tp = NULL; - lock_flags = XFS_ILOCK_EXCL; - if (flags & ATTR_NOLOCK) - need_iolock = 0; - if (!(mask & XFS_AT_SIZE)) { - if ((mask != (XFS_AT_CTIME|XFS_AT_ATIME|XFS_AT_MTIME)) || - (mp->m_flags & XFS_MOUNT_WSYNC)) { - tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE); - commit_flags = 0; - if ((code = xfs_trans_reserve(tp, 0, - XFS_ICHANGE_LOG_RES(mp), 0, - 0, 0))) { - lock_flags = 0; - goto error_return; - } - } - } else { - if (DM_EVENT_ENABLED(ip, DM_EVENT_TRUNCATE) && - !(flags & ATTR_DMI)) { - int dmflags = AT_DELAY_FLAG(flags) | DM_SEM_FLAG_WR; - code = XFS_SEND_DATA(mp, DM_EVENT_TRUNCATE, vp, - vap->va_size, 0, dmflags, NULL); - if (code) { - lock_flags = 0; - goto error_return; - } - } - if (need_iolock) - lock_flags |= XFS_IOLOCK_EXCL; - } - - xfs_ilock(ip, lock_flags); - - /* boolean: are we the file owner? */ - file_owner = (current_fsuid(credp) == ip->i_d.di_uid); - - /* - * Change various properties of a file. - * Only the owner or users with CAP_FOWNER - * capability may do these things. - */ - if (mask & - (XFS_AT_MODE|XFS_AT_XFLAGS|XFS_AT_EXTSIZE|XFS_AT_UID| - XFS_AT_GID|XFS_AT_PROJID)) { - /* - * CAP_FOWNER overrides the following restrictions: - * - * The user ID of the calling process must be equal - * to the file owner ID, except in cases where the - * CAP_FSETID capability is applicable. - */ - if (!file_owner && !capable(CAP_FOWNER)) { - code = XFS_ERROR(EPERM); - goto error_return; - } - - /* - * CAP_FSETID overrides the following restrictions: - * - * The effective user ID of the calling process shall match - * the file owner when setting the set-user-ID and - * set-group-ID bits on that file. - * - * The effective group ID or one of the supplementary group - * IDs of the calling process shall match the group owner of - * the file when setting the set-group-ID bit on that file - */ - if (mask & XFS_AT_MODE) { - mode_t m = 0; - - if ((vap->va_mode & S_ISUID) && !file_owner) - m |= S_ISUID; - if ((vap->va_mode & S_ISGID) && - !in_group_p((gid_t)ip->i_d.di_gid)) - m |= S_ISGID; -#if 0 - /* Linux allows this, Irix doesn't. */ - if ((vap->va_mode & S_ISVTX) && !VN_ISDIR(vp)) - m |= S_ISVTX; -#endif - if (m && !capable(CAP_FSETID)) - vap->va_mode &= ~m; - } - } - - /* - * Change file ownership. Must be the owner or privileged. - * If the system was configured with the "restricted_chown" - * option, the owner is not permitted to give away the file, - * and can change the group id only to a group of which he - * or she is a member. - */ - if (mask & (XFS_AT_UID|XFS_AT_GID|XFS_AT_PROJID)) { - /* - * These IDs could have changed since we last looked at them. - * But, we're assured that if the ownership did change - * while we didn't have the inode locked, inode's dquot(s) - * would have changed also. - */ - iuid = ip->i_d.di_uid; - iprojid = ip->i_d.di_projid; - igid = ip->i_d.di_gid; - gid = (mask & XFS_AT_GID) ? vap->va_gid : igid; - uid = (mask & XFS_AT_UID) ? vap->va_uid : iuid; - projid = (mask & XFS_AT_PROJID) ? (xfs_prid_t)vap->va_projid : - iprojid; - - /* - * CAP_CHOWN overrides the following restrictions: - * - * If _POSIX_CHOWN_RESTRICTED is defined, this capability - * shall override the restriction that a process cannot - * change the user ID of a file it owns and the restriction - * that the group ID supplied to the chown() function - * shall be equal to either the group ID or one of the - * supplementary group IDs of the calling process. - */ - if (restricted_chown && - (iuid != uid || (igid != gid && - !in_group_p((gid_t)gid))) && - !capable(CAP_CHOWN)) { - code = XFS_ERROR(EPERM); - goto error_return; - } - /* - * Do a quota reservation only if uid/projid/gid is actually - * going to change. - */ - if ((XFS_IS_UQUOTA_ON(mp) && iuid != uid) || - (XFS_IS_PQUOTA_ON(mp) && iprojid != projid) || - (XFS_IS_GQUOTA_ON(mp) && igid != gid)) { - ASSERT(tp); - code = XFS_QM_DQVOPCHOWNRESV(mp, tp, ip, udqp, gdqp, - capable(CAP_FOWNER) ? - XFS_QMOPT_FORCE_RES : 0); - if (code) /* out of quota */ - goto error_return; - } - } - - /* - * Truncate file. Must have write permission and not be a directory. - */ - if (mask & XFS_AT_SIZE) { - /* Short circuit the truncate case for zero length files */ - if ((vap->va_size == 0) && - (ip->i_size == 0) && (ip->i_d.di_nextents == 0)) { - xfs_iunlock(ip, XFS_ILOCK_EXCL); - lock_flags &= ~XFS_ILOCK_EXCL; - if (mask & XFS_AT_CTIME) - xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); - code = 0; - goto error_return; - } - - if (VN_ISDIR(vp)) { - code = XFS_ERROR(EISDIR); - goto error_return; - } else if (!VN_ISREG(vp)) { - code = XFS_ERROR(EINVAL); - goto error_return; - } - /* - * Make sure that the dquots are attached to the inode. - */ - if ((code = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED))) - goto error_return; - } - - /* - * Change file access or modified times. - */ - if (mask & (XFS_AT_ATIME|XFS_AT_MTIME)) { - if (!file_owner) { - if ((flags & ATTR_UTIME) && - !capable(CAP_FOWNER)) { - code = XFS_ERROR(EPERM); - goto error_return; - } - } - } - - /* - * Change extent size or realtime flag. - */ - if (mask & (XFS_AT_EXTSIZE|XFS_AT_XFLAGS)) { - /* - * Can't change extent size if any extents are allocated. - */ - if (ip->i_d.di_nextents && (mask & XFS_AT_EXTSIZE) && - ((ip->i_d.di_extsize << mp->m_sb.sb_blocklog) != - vap->va_extsize) ) { - code = XFS_ERROR(EINVAL); /* EFBIG? */ - goto error_return; - } - - /* - * Can't change realtime flag if any extents are allocated. - */ - if ((ip->i_d.di_nextents || ip->i_delayed_blks) && - (mask & XFS_AT_XFLAGS) && - (XFS_IS_REALTIME_INODE(ip)) != - (vap->va_xflags & XFS_XFLAG_REALTIME)) { - code = XFS_ERROR(EINVAL); /* EFBIG? */ - goto error_return; - } - /* - * Extent size must be a multiple of the appropriate block - * size, if set at all. - */ - if ((mask & XFS_AT_EXTSIZE) && vap->va_extsize != 0) { - xfs_extlen_t size; - - if (XFS_IS_REALTIME_INODE(ip) || - ((mask & XFS_AT_XFLAGS) && - (vap->va_xflags & XFS_XFLAG_REALTIME))) { - size = mp->m_sb.sb_rextsize << - mp->m_sb.sb_blocklog; - } else { - size = mp->m_sb.sb_blocksize; - } - if (vap->va_extsize % size) { - code = XFS_ERROR(EINVAL); - goto error_return; - } - } - /* - * If realtime flag is set then must have realtime data. - */ - if ((mask & XFS_AT_XFLAGS) && - (vap->va_xflags & XFS_XFLAG_REALTIME)) { - if ((mp->m_sb.sb_rblocks == 0) || - (mp->m_sb.sb_rextsize == 0) || - (ip->i_d.di_extsize % mp->m_sb.sb_rextsize)) { - code = XFS_ERROR(EINVAL); - goto error_return; - } - } - - /* - * Can't modify an immutable/append-only file unless - * we have appropriate permission. - */ - if ((mask & XFS_AT_XFLAGS) && - (ip->i_d.di_flags & - (XFS_DIFLAG_IMMUTABLE|XFS_DIFLAG_APPEND) || - (vap->va_xflags & - (XFS_XFLAG_IMMUTABLE | XFS_XFLAG_APPEND))) && - !capable(CAP_LINUX_IMMUTABLE)) { - code = XFS_ERROR(EPERM); - goto error_return; - } - } - - /* - * Now we can make the changes. Before we join the inode - * to the transaction, if XFS_AT_SIZE is set then take care of - * the part of the truncation that must be done without the - * inode lock. This needs to be done before joining the inode - * to the transaction, because the inode cannot be unlocked - * once it is a part of the transaction. - */ - if (mask & XFS_AT_SIZE) { - code = 0; - if ((vap->va_size > ip->i_size) && - (flags & ATTR_NOSIZETOK) == 0) { - code = xfs_igrow_start(ip, vap->va_size, credp); - } - xfs_iunlock(ip, XFS_ILOCK_EXCL); - - /* - * We are going to log the inode size change in this - * transaction so any previous writes that are beyond the on - * disk EOF and the new EOF that have not been written out need - * to be written here. If we do not write the data out, we - * expose ourselves to the null files problem. - * - * Only flush from the on disk size to the smaller of the in - * memory file size or the new size as that's the range we - * really care about here and prevents waiting for other data - * not within the range we care about here. - */ - if (!code && - (ip->i_size != ip->i_d.di_size) && - (vap->va_size > ip->i_d.di_size)) { - code = xfs_flush_pages(ip, - ip->i_d.di_size, vap->va_size, - XFS_B_ASYNC, FI_NONE); - } - - /* wait for all I/O to complete */ - vn_iowait(ip); - - if (!code) - code = xfs_itruncate_data(ip, vap->va_size); - if (code) { - ASSERT(tp == NULL); - lock_flags &= ~XFS_ILOCK_EXCL; - ASSERT(lock_flags == XFS_IOLOCK_EXCL); - goto error_return; - } - tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE); - if ((code = xfs_trans_reserve(tp, 0, - XFS_ITRUNCATE_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, - XFS_ITRUNCATE_LOG_COUNT))) { - xfs_trans_cancel(tp, 0); - if (need_iolock) - xfs_iunlock(ip, XFS_IOLOCK_EXCL); - return code; - } - commit_flags = XFS_TRANS_RELEASE_LOG_RES; - xfs_ilock(ip, XFS_ILOCK_EXCL); - } - - if (tp) { - xfs_trans_ijoin(tp, ip, lock_flags); - xfs_trans_ihold(tp, ip); - } - - /* determine whether mandatory locking mode changes */ - mandlock_before = MANDLOCK(vp, ip->i_d.di_mode); - - /* - * Truncate file. Must have write permission and not be a directory. - */ - if (mask & XFS_AT_SIZE) { - if (vap->va_size > ip->i_size) { - xfs_igrow_finish(tp, ip, vap->va_size, - !(flags & ATTR_DMI)); - } else if ((vap->va_size <= ip->i_size) || - ((vap->va_size == 0) && ip->i_d.di_nextents)) { - /* - * signal a sync transaction unless - * we're truncating an already unlinked - * file on a wsync filesystem - */ - code = xfs_itruncate_finish(&tp, ip, - (xfs_fsize_t)vap->va_size, - XFS_DATA_FORK, - ((ip->i_d.di_nlink != 0 || - !(mp->m_flags & XFS_MOUNT_WSYNC)) - ? 1 : 0)); - if (code) - goto abort_return; - /* - * Truncated "down", so we're removing references - * to old data here - if we now delay flushing for - * a long time, we expose ourselves unduly to the - * notorious NULL files problem. So, we mark this - * vnode and flush it when the file is closed, and - * do not wait the usual (long) time for writeout. - */ - xfs_iflags_set(ip, XFS_ITRUNCATED); - } - /* - * Have to do this even if the file's size doesn't change. - */ - timeflags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG; - } - - /* - * Change file access modes. - */ - if (mask & XFS_AT_MODE) { - ip->i_d.di_mode &= S_IFMT; - ip->i_d.di_mode |= vap->va_mode & ~S_IFMT; - - xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE); - timeflags |= XFS_ICHGTIME_CHG; - } - - /* - * Change file ownership. Must be the owner or privileged. - * If the system was configured with the "restricted_chown" - * option, the owner is not permitted to give away the file, - * and can change the group id only to a group of which he - * or she is a member. - */ - if (mask & (XFS_AT_UID|XFS_AT_GID|XFS_AT_PROJID)) { - /* - * CAP_FSETID overrides the following restrictions: - * - * The set-user-ID and set-group-ID bits of a file will be - * cleared upon successful return from chown() - */ - if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) && - !capable(CAP_FSETID)) { - ip->i_d.di_mode &= ~(S_ISUID|S_ISGID); - } - - /* - * Change the ownerships and register quota modifications - * in the transaction. - */ - if (iuid != uid) { - if (XFS_IS_UQUOTA_ON(mp)) { - ASSERT(mask & XFS_AT_UID); - ASSERT(udqp); - olddquot1 = XFS_QM_DQVOPCHOWN(mp, tp, ip, - &ip->i_udquot, udqp); - } - ip->i_d.di_uid = uid; - } - if (igid != gid) { - if (XFS_IS_GQUOTA_ON(mp)) { - ASSERT(!XFS_IS_PQUOTA_ON(mp)); - ASSERT(mask & XFS_AT_GID); - ASSERT(gdqp); - olddquot2 = XFS_QM_DQVOPCHOWN(mp, tp, ip, - &ip->i_gdquot, gdqp); - } - ip->i_d.di_gid = gid; - } - if (iprojid != projid) { - if (XFS_IS_PQUOTA_ON(mp)) { - ASSERT(!XFS_IS_GQUOTA_ON(mp)); - ASSERT(mask & XFS_AT_PROJID); - ASSERT(gdqp); - olddquot2 = XFS_QM_DQVOPCHOWN(mp, tp, ip, - &ip->i_gdquot, gdqp); - } - ip->i_d.di_projid = projid; - /* - * We may have to rev the inode as well as - * the superblock version number since projids didn't - * exist before DINODE_VERSION_2 and SB_VERSION_NLINK. - */ - if (ip->i_d.di_version == XFS_DINODE_VERSION_1) - xfs_bump_ino_vers2(tp, ip); - } - - xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE); - timeflags |= XFS_ICHGTIME_CHG; - } - - - /* - * Change file access or modified times. - */ - if (mask & (XFS_AT_ATIME|XFS_AT_MTIME)) { - if (mask & XFS_AT_ATIME) { - ip->i_d.di_atime.t_sec = vap->va_atime.tv_sec; - ip->i_d.di_atime.t_nsec = vap->va_atime.tv_nsec; - ip->i_update_core = 1; - timeflags &= ~XFS_ICHGTIME_ACC; - } - if (mask & XFS_AT_MTIME) { - ip->i_d.di_mtime.t_sec = vap->va_mtime.tv_sec; - ip->i_d.di_mtime.t_nsec = vap->va_mtime.tv_nsec; - timeflags &= ~XFS_ICHGTIME_MOD; - timeflags |= XFS_ICHGTIME_CHG; - } - if (tp && (flags & ATTR_UTIME)) - xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE); - } - - /* - * Change XFS-added attributes. - */ - if (mask & (XFS_AT_EXTSIZE|XFS_AT_XFLAGS)) { - if (mask & XFS_AT_EXTSIZE) { - /* - * Converting bytes to fs blocks. - */ - ip->i_d.di_extsize = vap->va_extsize >> - mp->m_sb.sb_blocklog; - } - if (mask & XFS_AT_XFLAGS) { - uint di_flags; - - /* can't set PREALLOC this way, just preserve it */ - di_flags = (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC); - if (vap->va_xflags & XFS_XFLAG_IMMUTABLE) - di_flags |= XFS_DIFLAG_IMMUTABLE; - if (vap->va_xflags & XFS_XFLAG_APPEND) - di_flags |= XFS_DIFLAG_APPEND; - if (vap->va_xflags & XFS_XFLAG_SYNC) - di_flags |= XFS_DIFLAG_SYNC; - if (vap->va_xflags & XFS_XFLAG_NOATIME) - di_flags |= XFS_DIFLAG_NOATIME; - if (vap->va_xflags & XFS_XFLAG_NODUMP) - di_flags |= XFS_DIFLAG_NODUMP; - if (vap->va_xflags & XFS_XFLAG_PROJINHERIT) - di_flags |= XFS_DIFLAG_PROJINHERIT; - if (vap->va_xflags & XFS_XFLAG_NODEFRAG) - di_flags |= XFS_DIFLAG_NODEFRAG; - if (vap->va_xflags & XFS_XFLAG_FILESTREAM) - di_flags |= XFS_DIFLAG_FILESTREAM; - if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) { - if (vap->va_xflags & XFS_XFLAG_RTINHERIT) - di_flags |= XFS_DIFLAG_RTINHERIT; - if (vap->va_xflags & XFS_XFLAG_NOSYMLINKS) - di_flags |= XFS_DIFLAG_NOSYMLINKS; - if (vap->va_xflags & XFS_XFLAG_EXTSZINHERIT) - di_flags |= XFS_DIFLAG_EXTSZINHERIT; - } else if ((ip->i_d.di_mode & S_IFMT) == S_IFREG) { - if (vap->va_xflags & XFS_XFLAG_REALTIME) - di_flags |= XFS_DIFLAG_REALTIME; - if (vap->va_xflags & XFS_XFLAG_EXTSIZE) - di_flags |= XFS_DIFLAG_EXTSIZE; - } - ip->i_d.di_flags = di_flags; - } - xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); - timeflags |= XFS_ICHGTIME_CHG; - } - - /* - * Change file inode change time only if XFS_AT_CTIME set - * AND we have been called by a DMI function. - */ - - if ( (flags & ATTR_DMI) && (mask & XFS_AT_CTIME) ) { - ip->i_d.di_ctime.t_sec = vap->va_ctime.tv_sec; - ip->i_d.di_ctime.t_nsec = vap->va_ctime.tv_nsec; - ip->i_update_core = 1; - timeflags &= ~XFS_ICHGTIME_CHG; - } - - /* - * Send out timestamp changes that need to be set to the - * current time. Not done when called by a DMI function. - */ - if (timeflags && !(flags & ATTR_DMI)) - xfs_ichgtime(ip, timeflags); - - XFS_STATS_INC(xs_ig_attrchg); - - /* - * If this is a synchronous mount, make sure that the - * transaction goes to disk before returning to the user. - * This is slightly sub-optimal in that truncates require - * two sync transactions instead of one for wsync filesystems. - * One for the truncate and one for the timestamps since we - * don't want to change the timestamps unless we're sure the - * truncate worked. Truncates are less than 1% of the laddis - * mix so this probably isn't worth the trouble to optimize. - */ - code = 0; - if (tp) { - if (mp->m_flags & XFS_MOUNT_WSYNC) - xfs_trans_set_sync(tp); - - code = xfs_trans_commit(tp, commit_flags); - } - - /* - * If the (regular) file's mandatory locking mode changed, then - * notify the vnode. We do this under the inode lock to prevent - * racing calls to vop_vnode_change. - */ - mandlock_after = MANDLOCK(vp, ip->i_d.di_mode); - - xfs_iunlock(ip, lock_flags); - - /* - * Release any dquot(s) the inode had kept before chown. - */ - XFS_QM_DQRELE(mp, olddquot1); - XFS_QM_DQRELE(mp, olddquot2); - XFS_QM_DQRELE(mp, udqp); - XFS_QM_DQRELE(mp, gdqp); - - if (code) { - return code; - } - - if (DM_EVENT_ENABLED(ip, DM_EVENT_ATTRIBUTE) && - !(flags & ATTR_DMI)) { - (void) XFS_SEND_NAMESP(mp, DM_EVENT_ATTRIBUTE, vp, DM_RIGHT_NULL, - NULL, DM_RIGHT_NULL, NULL, NULL, - 0, 0, AT_DELAY_FLAG(flags)); - } - return 0; - - abort_return: - commit_flags |= XFS_TRANS_ABORT; - /* FALLTHROUGH */ - error_return: - XFS_QM_DQRELE(mp, udqp); - XFS_QM_DQRELE(mp, gdqp); - if (tp) { - xfs_trans_cancel(tp, commit_flags); - } - if (lock_flags != 0) { - xfs_iunlock(ip, lock_flags); - } - return code; -} - -/* - * The maximum pathlen is 1024 bytes. Since the minimum file system - * blocksize is 512 bytes, we can get a max of 2 extents back from - * bmapi. - */ -#define SYMLINK_MAPS 2 - -STATIC int -xfs_readlink_bmap( - xfs_inode_t *ip, - char *link) -{ - xfs_mount_t *mp = ip->i_mount; - int pathlen = ip->i_d.di_size; - int nmaps = SYMLINK_MAPS; - xfs_bmbt_irec_t mval[SYMLINK_MAPS]; - xfs_daddr_t d; - int byte_cnt; - int n; - xfs_buf_t *bp; - int error = 0; - - error = xfs_bmapi(NULL, ip, 0, XFS_B_TO_FSB(mp, pathlen), 0, NULL, 0, - mval, &nmaps, NULL, NULL); - if (error) - goto out; - - for (n = 0; n < nmaps; n++) { - d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock); - byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount); - - bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0); - error = XFS_BUF_GETERROR(bp); - if (error) { - xfs_ioerror_alert("xfs_readlink", - ip->i_mount, bp, XFS_BUF_ADDR(bp)); - xfs_buf_relse(bp); - goto out; - } - if (pathlen < byte_cnt) - byte_cnt = pathlen; - pathlen -= byte_cnt; - - memcpy(link, XFS_BUF_PTR(bp), byte_cnt); - xfs_buf_relse(bp); - } - - link[ip->i_d.di_size] = '\0'; - error = 0; - - out: - return error; -} - -int -xfs_readlink( - xfs_inode_t *ip, - char *link) -{ - xfs_mount_t *mp = ip->i_mount; - int pathlen; - int error = 0; - - xfs_itrace_entry(ip); - - if (XFS_FORCED_SHUTDOWN(mp)) - return XFS_ERROR(EIO); - - xfs_ilock(ip, XFS_ILOCK_SHARED); - - ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFLNK); - ASSERT(ip->i_d.di_size <= MAXPATHLEN); - - pathlen = ip->i_d.di_size; - if (!pathlen) - goto out; - - if (ip->i_df.if_flags & XFS_IFINLINE) { - memcpy(link, ip->i_df.if_u1.if_data, pathlen); - link[pathlen] = '\0'; - } else { - error = xfs_readlink_bmap(ip, link); - } - - out: - xfs_iunlock(ip, XFS_ILOCK_SHARED); - return error; -} - -/* - * xfs_fsync - * - * This is called to sync the inode and its data out to disk. - * We need to hold the I/O lock while flushing the data, and - * the inode lock while flushing the inode. The inode lock CANNOT - * be held while flushing the data, so acquire after we're done - * with that. - */ -int -xfs_fsync( - xfs_inode_t *ip, - int flag, - xfs_off_t start, - xfs_off_t stop) -{ - xfs_trans_t *tp; - int error; - int log_flushed = 0, changed = 1; - - xfs_itrace_entry(ip); - - ASSERT(start >= 0 && stop >= -1); - - if (XFS_FORCED_SHUTDOWN(ip->i_mount)) - return XFS_ERROR(EIO); - - if (flag & FSYNC_DATA) - filemap_fdatawait(vn_to_inode(XFS_ITOV(ip))->i_mapping); - - /* - * We always need to make sure that the required inode state - * is safe on disk. The vnode might be clean but because - * of committed transactions that haven't hit the disk yet. - * Likewise, there could be unflushed non-transactional - * changes to the inode core that have to go to disk. - * - * The following code depends on one assumption: that - * any transaction that changes an inode logs the core - * because it has to change some field in the inode core - * (typically nextents or nblocks). That assumption - * implies that any transactions against an inode will - * catch any non-transactional updates. If inode-altering - * transactions exist that violate this assumption, the - * code breaks. Right now, it figures that if the involved - * update_* field is clear and the inode is unpinned, the - * inode is clean. Either it's been flushed or it's been - * committed and the commit has hit the disk unpinning the inode. - * (Note that xfs_inode_item_format() called at commit clears - * the update_* fields.) - */ - xfs_ilock(ip, XFS_ILOCK_SHARED); - - /* If we are flushing data then we care about update_size - * being set, otherwise we care about update_core - */ - if ((flag & FSYNC_DATA) ? - (ip->i_update_size == 0) : - (ip->i_update_core == 0)) { - /* - * Timestamps/size haven't changed since last inode - * flush or inode transaction commit. That means - * either nothing got written or a transaction - * committed which caught the updates. If the - * latter happened and the transaction hasn't - * hit the disk yet, the inode will be still - * be pinned. If it is, force the log. - */ - - xfs_iunlock(ip, XFS_ILOCK_SHARED); - - if (xfs_ipincount(ip)) { - _xfs_log_force(ip->i_mount, (xfs_lsn_t)0, - XFS_LOG_FORCE | - ((flag & FSYNC_WAIT) - ? XFS_LOG_SYNC : 0), - &log_flushed); - } else { - /* - * If the inode is not pinned and nothing - * has changed we don't need to flush the - * cache. - */ - changed = 0; - } - error = 0; - } else { - /* - * Kick off a transaction to log the inode - * core to get the updates. Make it - * sync if FSYNC_WAIT is passed in (which - * is done by everybody but specfs). The - * sync transaction will also force the log. - */ - xfs_iunlock(ip, XFS_ILOCK_SHARED); - tp = xfs_trans_alloc(ip->i_mount, XFS_TRANS_FSYNC_TS); - if ((error = xfs_trans_reserve(tp, 0, - XFS_FSYNC_TS_LOG_RES(ip->i_mount), - 0, 0, 0))) { - xfs_trans_cancel(tp, 0); - return error; - } - xfs_ilock(ip, XFS_ILOCK_EXCL); - - /* - * Note - it's possible that we might have pushed - * ourselves out of the way during trans_reserve - * which would flush the inode. But there's no - * guarantee that the inode buffer has actually - * gone out yet (it's delwri). Plus the buffer - * could be pinned anyway if it's part of an - * inode in another recent transaction. So we - * play it safe and fire off the transaction anyway. - */ - xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); - xfs_trans_ihold(tp, ip); - xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); - if (flag & FSYNC_WAIT) - xfs_trans_set_sync(tp); - error = _xfs_trans_commit(tp, 0, &log_flushed); - - xfs_iunlock(ip, XFS_ILOCK_EXCL); - } - - if ((ip->i_mount->m_flags & XFS_MOUNT_BARRIER) && changed) { - /* - * If the log write didn't issue an ordered tag we need - * to flush the disk cache for the data device now. - */ - if (!log_flushed) - xfs_blkdev_issue_flush(ip->i_mount->m_ddev_targp); - - /* - * If this inode is on the RT dev we need to flush that - * cache as well. - */ - if (XFS_IS_REALTIME_INODE(ip)) - xfs_blkdev_issue_flush(ip->i_mount->m_rtdev_targp); - } - - return error; -} - -/* - * This is called by xfs_inactive to free any blocks beyond eof - * when the link count isn't zero and by xfs_dm_punch_hole() when - * punching a hole to EOF. - */ -int -xfs_free_eofblocks( - xfs_mount_t *mp, - xfs_inode_t *ip, - int flags) -{ - xfs_trans_t *tp; - int error; - xfs_fileoff_t end_fsb; - xfs_fileoff_t last_fsb; - xfs_filblks_t map_len; - int nimaps; - xfs_bmbt_irec_t imap; - int use_iolock = (flags & XFS_FREE_EOF_LOCK); - - /* - * Figure out if there are any blocks beyond the end - * of the file. If not, then there is nothing to do. - */ - end_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)ip->i_size)); - last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); - map_len = last_fsb - end_fsb; - if (map_len <= 0) - return 0; - - nimaps = 1; - xfs_ilock(ip, XFS_ILOCK_SHARED); - error = xfs_bmapi(NULL, ip, end_fsb, map_len, 0, - NULL, 0, &imap, &nimaps, NULL, NULL); - xfs_iunlock(ip, XFS_ILOCK_SHARED); - - if (!error && (nimaps != 0) && - (imap.br_startblock != HOLESTARTBLOCK || - ip->i_delayed_blks)) { - /* - * Attach the dquots to the inode up front. - */ - if ((error = XFS_QM_DQATTACH(mp, ip, 0))) - return error; - - /* - * There are blocks after the end of file. - * Free them up now by truncating the file to - * its current size. - */ - tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); - - /* - * Do the xfs_itruncate_start() call before - * reserving any log space because - * itruncate_start will call into the buffer - * cache and we can't - * do that within a transaction. - */ - if (use_iolock) - xfs_ilock(ip, XFS_IOLOCK_EXCL); - error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, - ip->i_size); - if (error) { - xfs_trans_cancel(tp, 0); - if (use_iolock) - xfs_iunlock(ip, XFS_IOLOCK_EXCL); - return error; - } - - error = xfs_trans_reserve(tp, 0, - XFS_ITRUNCATE_LOG_RES(mp), - 0, XFS_TRANS_PERM_LOG_RES, - XFS_ITRUNCATE_LOG_COUNT); - if (error) { - ASSERT(XFS_FORCED_SHUTDOWN(mp)); - xfs_trans_cancel(tp, 0); - xfs_iunlock(ip, XFS_IOLOCK_EXCL); - return error; - } - - xfs_ilock(ip, XFS_ILOCK_EXCL); - xfs_trans_ijoin(tp, ip, - XFS_IOLOCK_EXCL | - XFS_ILOCK_EXCL); - xfs_trans_ihold(tp, ip); - - error = xfs_itruncate_finish(&tp, ip, - ip->i_size, - XFS_DATA_FORK, - 0); - /* - * If we get an error at this point we - * simply don't bother truncating the file. - */ - if (error) { - xfs_trans_cancel(tp, - (XFS_TRANS_RELEASE_LOG_RES | - XFS_TRANS_ABORT)); - } else { - error = xfs_trans_commit(tp, - XFS_TRANS_RELEASE_LOG_RES); - } - xfs_iunlock(ip, (use_iolock ? (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL) - : XFS_ILOCK_EXCL)); - } - return error; -} - -/* - * Free a symlink that has blocks associated with it. - */ -STATIC int -xfs_inactive_symlink_rmt( - xfs_inode_t *ip, - xfs_trans_t **tpp) -{ - xfs_buf_t *bp; - int committed; - int done; - int error; - xfs_fsblock_t first_block; - xfs_bmap_free_t free_list; - int i; - xfs_mount_t *mp; - xfs_bmbt_irec_t mval[SYMLINK_MAPS]; - int nmaps; - xfs_trans_t *ntp; - int size; - xfs_trans_t *tp; - - tp = *tpp; - mp = ip->i_mount; - ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip)); - /* - * We're freeing a symlink that has some - * blocks allocated to it. Free the - * blocks here. We know that we've got - * either 1 or 2 extents and that we can - * free them all in one bunmapi call. - */ - ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2); - if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) { - ASSERT(XFS_FORCED_SHUTDOWN(mp)); - xfs_trans_cancel(tp, 0); - *tpp = NULL; - return error; - } - /* - * Lock the inode, fix the size, and join it to the transaction. - * Hold it so in the normal path, we still have it locked for - * the second transaction. In the error paths we need it - * held so the cancel won't rele it, see below. - */ - xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); - size = (int)ip->i_d.di_size; - ip->i_d.di_size = 0; - xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); - xfs_trans_ihold(tp, ip); - xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); - /* - * Find the block(s) so we can inval and unmap them. - */ - done = 0; - XFS_BMAP_INIT(&free_list, &first_block); - nmaps = ARRAY_SIZE(mval); - if ((error = xfs_bmapi(tp, ip, 0, XFS_B_TO_FSB(mp, size), - XFS_BMAPI_METADATA, &first_block, 0, mval, &nmaps, - &free_list, NULL))) - goto error0; - /* - * Invalidate the block(s). - */ - for (i = 0; i < nmaps; i++) { - bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, - XFS_FSB_TO_DADDR(mp, mval[i].br_startblock), - XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0); - xfs_trans_binval(tp, bp); - } - /* - * Unmap the dead block(s) to the free_list. - */ - if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps, - &first_block, &free_list, NULL, &done))) - goto error1; - ASSERT(done); - /* - * Commit the first transaction. This logs the EFI and the inode. - */ - if ((error = xfs_bmap_finish(&tp, &free_list, &committed))) - goto error1; - /* - * The transaction must have been committed, since there were - * actually extents freed by xfs_bunmapi. See xfs_bmap_finish. - * The new tp has the extent freeing and EFDs. - */ - ASSERT(committed); - /* - * The first xact was committed, so add the inode to the new one. - * Mark it dirty so it will be logged and moved forward in the log as - * part of every commit. - */ - xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); - xfs_trans_ihold(tp, ip); - xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); - /* - * Get a new, empty transaction to return to our caller. - */ - ntp = xfs_trans_dup(tp); - /* - * Commit the transaction containing extent freeing and EFDs. - * If we get an error on the commit here or on the reserve below, - * we need to unlock the inode since the new transaction doesn't - * have the inode attached. - */ - error = xfs_trans_commit(tp, 0); - tp = ntp; - if (error) { - ASSERT(XFS_FORCED_SHUTDOWN(mp)); - goto error0; - } - /* - * Remove the memory for extent descriptions (just bookkeeping). - */ - if (ip->i_df.if_bytes) - xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK); - ASSERT(ip->i_df.if_bytes == 0); - /* - * Put an itruncate log reservation in the new transaction - * for our caller. - */ - if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) { - ASSERT(XFS_FORCED_SHUTDOWN(mp)); - goto error0; - } - /* - * Return with the inode locked but not joined to the transaction. - */ - *tpp = tp; - return 0; - - error1: - xfs_bmap_cancel(&free_list); - error0: - /* - * Have to come here with the inode locked and either - * (held and in the transaction) or (not in the transaction). - * If the inode isn't held then cancel would iput it, but - * that's wrong since this is inactive and the vnode ref - * count is 0 already. - * Cancel won't do anything to the inode if held, but it still - * needs to be locked until the cancel is done, if it was - * joined to the transaction. - */ - xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); - xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); - *tpp = NULL; - return error; - -} - -STATIC int -xfs_inactive_symlink_local( - xfs_inode_t *ip, - xfs_trans_t **tpp) -{ - int error; - - ASSERT(ip->i_d.di_size <= XFS_IFORK_DSIZE(ip)); - /* - * We're freeing a symlink which fit into - * the inode. Just free the memory used - * to hold the old symlink. - */ - error = xfs_trans_reserve(*tpp, 0, - XFS_ITRUNCATE_LOG_RES(ip->i_mount), - 0, XFS_TRANS_PERM_LOG_RES, - XFS_ITRUNCATE_LOG_COUNT); - - if (error) { - xfs_trans_cancel(*tpp, 0); - *tpp = NULL; - return error; - } - xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); - - /* - * Zero length symlinks _can_ exist. - */ - if (ip->i_df.if_bytes > 0) { - xfs_idata_realloc(ip, - -(ip->i_df.if_bytes), - XFS_DATA_FORK); - ASSERT(ip->i_df.if_bytes == 0); - } - return 0; -} - -STATIC int -xfs_inactive_attrs( - xfs_inode_t *ip, - xfs_trans_t **tpp) -{ - xfs_trans_t *tp; - int error; - xfs_mount_t *mp; - - ASSERT(ismrlocked(&ip->i_iolock, MR_UPDATE)); - tp = *tpp; - mp = ip->i_mount; - ASSERT(ip->i_d.di_forkoff != 0); - xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); - xfs_iunlock(ip, XFS_ILOCK_EXCL); - - error = xfs_attr_inactive(ip); - if (error) { - *tpp = NULL; - xfs_iunlock(ip, XFS_IOLOCK_EXCL); - return error; /* goto out */ - } - - tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); - error = xfs_trans_reserve(tp, 0, - XFS_IFREE_LOG_RES(mp), - 0, XFS_TRANS_PERM_LOG_RES, - XFS_INACTIVE_LOG_COUNT); - if (error) { - ASSERT(XFS_FORCED_SHUTDOWN(mp)); - xfs_trans_cancel(tp, 0); - *tpp = NULL; - xfs_iunlock(ip, XFS_IOLOCK_EXCL); - return error; - } - - xfs_ilock(ip, XFS_ILOCK_EXCL); - xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); - xfs_trans_ihold(tp, ip); - xfs_idestroy_fork(ip, XFS_ATTR_FORK); - - ASSERT(ip->i_d.di_anextents == 0); - - *tpp = tp; - return 0; -} - -int -xfs_release( - xfs_inode_t *ip) -{ - bhv_vnode_t *vp = XFS_ITOV(ip); - xfs_mount_t *mp = ip->i_mount; - int error; - - if (!VN_ISREG(vp) || (ip->i_d.di_mode == 0)) - return 0; - - /* If this is a read-only mount, don't do this (would generate I/O) */ - if (mp->m_flags & XFS_MOUNT_RDONLY) - return 0; - - if (!XFS_FORCED_SHUTDOWN(mp)) { - int truncated; - - /* - * If we are using filestreams, and we have an unlinked - * file that we are processing the last close on, then nothing - * will be able to reopen and write to this file. Purge this - * inode from the filestreams cache so that it doesn't delay - * teardown of the inode. - */ - if ((ip->i_d.di_nlink == 0) && xfs_inode_is_filestream(ip)) - xfs_filestream_deassociate(ip); - - /* - * If we previously truncated this file and removed old data - * in the process, we want to initiate "early" writeout on - * the last close. This is an attempt to combat the notorious - * NULL files problem which is particularly noticable from a - * truncate down, buffered (re-)write (delalloc), followed by - * a crash. What we are effectively doing here is - * significantly reducing the time window where we'd otherwise - * be exposed to that problem. - */ - truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED); - if (truncated && VN_DIRTY(vp) && ip->i_delayed_blks > 0) - xfs_flush_pages(ip, 0, -1, XFS_B_ASYNC, FI_NONE); - } - -#ifdef HAVE_REFCACHE - /* If we are in the NFS reference cache then don't do this now */ - if (ip->i_refcache) - return 0; -#endif - - if (ip->i_d.di_nlink != 0) { - if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) && - ((ip->i_size > 0) || (VN_CACHED(vp) > 0 || - ip->i_delayed_blks > 0)) && - (ip->i_df.if_flags & XFS_IFEXTENTS)) && - (!(ip->i_d.di_flags & - (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)))) { - error = xfs_free_eofblocks(mp, ip, XFS_FREE_EOF_LOCK); - if (error) - return error; - } - } - - return 0; -} - -/* - * xfs_inactive - * - * This is called when the vnode reference count for the vnode - * goes to zero. If the file has been unlinked, then it must - * now be truncated. Also, we clear all of the read-ahead state - * kept for the inode here since the file is now closed. - */ -int -xfs_inactive( - xfs_inode_t *ip) -{ - bhv_vnode_t *vp = XFS_ITOV(ip); - xfs_bmap_free_t free_list; - xfs_fsblock_t first_block; - int committed; - xfs_trans_t *tp; - xfs_mount_t *mp; - int error; - int truncate; - - xfs_itrace_entry(ip); - - /* - * If the inode is already free, then there can be nothing - * to clean up here. - */ - if (ip->i_d.di_mode == 0 || VN_BAD(vp)) { - ASSERT(ip->i_df.if_real_bytes == 0); - ASSERT(ip->i_df.if_broot_bytes == 0); - return VN_INACTIVE_CACHE; - } - - /* - * Only do a truncate if it's a regular file with - * some actual space in it. It's OK to look at the - * inode's fields without the lock because we're the - * only one with a reference to the inode. - */ - truncate = ((ip->i_d.di_nlink == 0) && - ((ip->i_d.di_size != 0) || (ip->i_size != 0) || - (ip->i_d.di_nextents > 0) || (ip->i_delayed_blks > 0)) && - ((ip->i_d.di_mode & S_IFMT) == S_IFREG)); - - mp = ip->i_mount; - - if (ip->i_d.di_nlink == 0 && DM_EVENT_ENABLED(ip, DM_EVENT_DESTROY)) { - (void) XFS_SEND_DESTROY(mp, vp, DM_RIGHT_NULL); - } - - error = 0; - - /* If this is a read-only mount, don't do this (would generate I/O) */ - if (mp->m_flags & XFS_MOUNT_RDONLY) - goto out; - - if (ip->i_d.di_nlink != 0) { - if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) && - ((ip->i_size > 0) || (VN_CACHED(vp) > 0 || - ip->i_delayed_blks > 0)) && - (ip->i_df.if_flags & XFS_IFEXTENTS) && - (!(ip->i_d.di_flags & - (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) || - (ip->i_delayed_blks != 0)))) { - error = xfs_free_eofblocks(mp, ip, XFS_FREE_EOF_LOCK); - if (error) - return VN_INACTIVE_CACHE; - } - goto out; - } - - ASSERT(ip->i_d.di_nlink == 0); - - if ((error = XFS_QM_DQATTACH(mp, ip, 0))) - return VN_INACTIVE_CACHE; - - tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); - if (truncate) { - /* - * Do the xfs_itruncate_start() call before - * reserving any log space because itruncate_start - * will call into the buffer cache and we can't - * do that within a transaction. - */ - xfs_ilock(ip, XFS_IOLOCK_EXCL); - - error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, 0); - if (error) { - xfs_trans_cancel(tp, 0); - xfs_iunlock(ip, XFS_IOLOCK_EXCL); - return VN_INACTIVE_CACHE; - } - - error = xfs_trans_reserve(tp, 0, - XFS_ITRUNCATE_LOG_RES(mp), - 0, XFS_TRANS_PERM_LOG_RES, - XFS_ITRUNCATE_LOG_COUNT); - if (error) { - /* Don't call itruncate_cleanup */ - ASSERT(XFS_FORCED_SHUTDOWN(mp)); - xfs_trans_cancel(tp, 0); - xfs_iunlock(ip, XFS_IOLOCK_EXCL); - return VN_INACTIVE_CACHE; - } - - xfs_ilock(ip, XFS_ILOCK_EXCL); - xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); - xfs_trans_ihold(tp, ip); - - /* - * normally, we have to run xfs_itruncate_finish sync. - * But if filesystem is wsync and we're in the inactive - * path, then we know that nlink == 0, and that the - * xaction that made nlink == 0 is permanently committed - * since xfs_remove runs as a synchronous transaction. - */ - error = xfs_itruncate_finish(&tp, ip, 0, XFS_DATA_FORK, - (!(mp->m_flags & XFS_MOUNT_WSYNC) ? 1 : 0)); - - if (error) { - xfs_trans_cancel(tp, - XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); - xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); - return VN_INACTIVE_CACHE; - } - } else if ((ip->i_d.di_mode & S_IFMT) == S_IFLNK) { - - /* - * If we get an error while cleaning up a - * symlink we bail out. - */ - error = (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) ? - xfs_inactive_symlink_rmt(ip, &tp) : - xfs_inactive_symlink_local(ip, &tp); - - if (error) { - ASSERT(tp == NULL); - return VN_INACTIVE_CACHE; - } - - xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); - xfs_trans_ihold(tp, ip); - } else { - error = xfs_trans_reserve(tp, 0, - XFS_IFREE_LOG_RES(mp), - 0, XFS_TRANS_PERM_LOG_RES, - XFS_INACTIVE_LOG_COUNT); - if (error) { - ASSERT(XFS_FORCED_SHUTDOWN(mp)); - xfs_trans_cancel(tp, 0); - return VN_INACTIVE_CACHE; - } - - xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); - xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); - xfs_trans_ihold(tp, ip); - } - - /* - * If there are attributes associated with the file - * then blow them away now. The code calls a routine - * that recursively deconstructs the attribute fork. - * We need to just commit the current transaction - * because we can't use it for xfs_attr_inactive(). - */ - if (ip->i_d.di_anextents > 0) { - error = xfs_inactive_attrs(ip, &tp); - /* - * If we got an error, the transaction is already - * cancelled, and the inode is unlocked. Just get out. - */ - if (error) - return VN_INACTIVE_CACHE; - } else if (ip->i_afp) { - xfs_idestroy_fork(ip, XFS_ATTR_FORK); - } - - /* - * Free the inode. - */ - XFS_BMAP_INIT(&free_list, &first_block); - error = xfs_ifree(tp, ip, &free_list); - if (error) { - /* - * If we fail to free the inode, shut down. The cancel - * might do that, we need to make sure. Otherwise the - * inode might be lost for a long time or forever. - */ - if (!XFS_FORCED_SHUTDOWN(mp)) { - cmn_err(CE_NOTE, - "xfs_inactive: xfs_ifree() returned an error = %d on %s", - error, mp->m_fsname); - xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR); - } - xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT); - } else { - /* - * Credit the quota account(s). The inode is gone. - */ - XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_ICOUNT, -1); - - /* - * Just ignore errors at this point. There is - * nothing we can do except to try to keep going. - */ - (void) xfs_bmap_finish(&tp, &free_list, &committed); - (void) xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); - } - /* - * Release the dquots held by inode, if any. - */ - XFS_QM_DQDETACH(mp, ip); - - xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); - - out: - return VN_INACTIVE_CACHE; -} - - -int -xfs_lookup( - xfs_inode_t *dp, - bhv_vname_t *dentry, - bhv_vnode_t **vpp) -{ - xfs_inode_t *ip; - xfs_ino_t e_inum; - int error; - uint lock_mode; - - xfs_itrace_entry(dp); - - if (XFS_FORCED_SHUTDOWN(dp->i_mount)) - return XFS_ERROR(EIO); - - lock_mode = xfs_ilock_map_shared(dp); - error = xfs_dir_lookup_int(dp, lock_mode, dentry, &e_inum, &ip); - if (!error) { - *vpp = XFS_ITOV(ip); - xfs_itrace_ref(ip); - } - xfs_iunlock_map_shared(dp, lock_mode); - return error; -} - -int -xfs_create( - xfs_inode_t *dp, - bhv_vname_t *dentry, - mode_t mode, - xfs_dev_t rdev, - bhv_vnode_t **vpp, - cred_t *credp) -{ - char *name = VNAME(dentry); - xfs_mount_t *mp = dp->i_mount; - bhv_vnode_t *dir_vp = XFS_ITOV(dp); - xfs_inode_t *ip; - bhv_vnode_t *vp = NULL; - xfs_trans_t *tp; - int error; - xfs_bmap_free_t free_list; - xfs_fsblock_t first_block; - boolean_t unlock_dp_on_error = B_FALSE; - int dm_event_sent = 0; - uint cancel_flags; - int committed; - xfs_prid_t prid; - struct xfs_dquot *udqp, *gdqp; - uint resblks; - int namelen; - - ASSERT(!*vpp); - xfs_itrace_entry(dp); - - namelen = VNAMELEN(dentry); - - if (DM_EVENT_ENABLED(dp, DM_EVENT_CREATE)) { - error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE, - dir_vp, DM_RIGHT_NULL, NULL, - DM_RIGHT_NULL, name, NULL, - mode, 0, 0); - - if (error) - return error; - dm_event_sent = 1; - } - - if (XFS_FORCED_SHUTDOWN(mp)) - return XFS_ERROR(EIO); - - /* Return through std_return after this point. */ - - udqp = gdqp = NULL; - if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) - prid = dp->i_d.di_projid; - else - prid = (xfs_prid_t)dfltprid; - - /* - * Make sure that we have allocated dquot(s) on disk. - */ - error = XFS_QM_DQVOPALLOC(mp, dp, - current_fsuid(credp), current_fsgid(credp), prid, - XFS_QMOPT_QUOTALL|XFS_QMOPT_INHERIT, &udqp, &gdqp); - if (error) - goto std_return; - - ip = NULL; - - tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE); - cancel_flags = XFS_TRANS_RELEASE_LOG_RES; - resblks = XFS_CREATE_SPACE_RES(mp, namelen); - /* - * Initially assume that the file does not exist and - * reserve the resources for that case. If that is not - * the case we'll drop the one we have and get a more - * appropriate transaction later. - */ - error = xfs_trans_reserve(tp, resblks, XFS_CREATE_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, XFS_CREATE_LOG_COUNT); - if (error == ENOSPC) { - resblks = 0; - error = xfs_trans_reserve(tp, 0, XFS_CREATE_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, XFS_CREATE_LOG_COUNT); - } - if (error) { - cancel_flags = 0; - goto error_return; - } - - xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT); - unlock_dp_on_error = B_TRUE; - - XFS_BMAP_INIT(&free_list, &first_block); - - ASSERT(ip == NULL); - - /* - * Reserve disk quota and the inode. - */ - error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0); - if (error) - goto error_return; - - if (resblks == 0 && (error = xfs_dir_canenter(tp, dp, name, namelen))) - goto error_return; - error = xfs_dir_ialloc(&tp, dp, mode, 1, - rdev, credp, prid, resblks > 0, - &ip, &committed); - if (error) { - if (error == ENOSPC) - goto error_return; - goto abort_return; - } - xfs_itrace_ref(ip); - - /* - * At this point, we've gotten a newly allocated inode. - * It is locked (and joined to the transaction). - */ - - ASSERT(ismrlocked (&ip->i_lock, MR_UPDATE)); - - /* - * Now we join the directory inode to the transaction. We do not do it - * earlier because xfs_dir_ialloc might commit the previous transaction - * (and release all the locks). An error from here on will result in - * the transaction cancel unlocking dp so don't do it explicitly in the - * error path. - */ - VN_HOLD(dir_vp); - xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); - unlock_dp_on_error = B_FALSE; - - error = xfs_dir_createname(tp, dp, name, namelen, ip->i_ino, - &first_block, &free_list, resblks ? - resblks - XFS_IALLOC_SPACE_RES(mp) : 0); - if (error) { - ASSERT(error != ENOSPC); - goto abort_return; - } - xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); - xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); - - /* - * If this is a synchronous mount, make sure that the - * create transaction goes to disk before returning to - * the user. - */ - if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { - xfs_trans_set_sync(tp); - } - - dp->i_gen++; - - /* - * Attach the dquot(s) to the inodes and modify them incore. - * These ids of the inode couldn't have changed since the new - * inode has been locked ever since it was created. - */ - XFS_QM_DQVOPCREATE(mp, tp, ip, udqp, gdqp); - - /* - * xfs_trans_commit normally decrements the vnode ref count - * when it unlocks the inode. Since we want to return the - * vnode to the caller, we bump the vnode ref count now. - */ - IHOLD(ip); - vp = XFS_ITOV(ip); - - error = xfs_bmap_finish(&tp, &free_list, &committed); - if (error) { - xfs_bmap_cancel(&free_list); - goto abort_rele; - } - - error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); - if (error) { - IRELE(ip); - tp = NULL; - goto error_return; - } - - XFS_QM_DQRELE(mp, udqp); - XFS_QM_DQRELE(mp, gdqp); - - *vpp = vp; - - /* Fallthrough to std_return with error = 0 */ - -std_return: - if ((*vpp || (error != 0 && dm_event_sent != 0)) && - DM_EVENT_ENABLED(dp, DM_EVENT_POSTCREATE)) { - (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTCREATE, - dir_vp, DM_RIGHT_NULL, - *vpp ? vp:NULL, - DM_RIGHT_NULL, name, NULL, - mode, error, 0); - } - return error; - - abort_return: - cancel_flags |= XFS_TRANS_ABORT; - /* FALLTHROUGH */ - - error_return: - if (tp != NULL) - xfs_trans_cancel(tp, cancel_flags); - - XFS_QM_DQRELE(mp, udqp); - XFS_QM_DQRELE(mp, gdqp); - - if (unlock_dp_on_error) - xfs_iunlock(dp, XFS_ILOCK_EXCL); - - goto std_return; - - abort_rele: - /* - * Wait until after the current transaction is aborted to - * release the inode. This prevents recursive transactions - * and deadlocks from xfs_inactive. - */ - cancel_flags |= XFS_TRANS_ABORT; - xfs_trans_cancel(tp, cancel_flags); - IRELE(ip); - - XFS_QM_DQRELE(mp, udqp); - XFS_QM_DQRELE(mp, gdqp); - - goto std_return; -} - -#ifdef DEBUG -/* - * Some counters to see if (and how often) we are hitting some deadlock - * prevention code paths. - */ - -int xfs_rm_locks; -int xfs_rm_lock_delays; -int xfs_rm_attempts; -#endif - -/* - * The following routine will lock the inodes associated with the - * directory and the named entry in the directory. The locks are - * acquired in increasing inode number. - * - * If the entry is "..", then only the directory is locked. The - * vnode ref count will still include that from the .. entry in - * this case. - * - * There is a deadlock we need to worry about. If the locked directory is - * in the AIL, it might be blocking up the log. The next inode we lock - * could be already locked by another thread waiting for log space (e.g - * a permanent log reservation with a long running transaction (see - * xfs_itruncate_finish)). To solve this, we must check if the directory - * is in the ail and use lock_nowait. If we can't lock, we need to - * drop the inode lock on the directory and try again. xfs_iunlock will - * potentially push the tail if we were holding up the log. - */ -STATIC int -xfs_lock_dir_and_entry( - xfs_inode_t *dp, - xfs_inode_t *ip) /* inode of entry 'name' */ -{ - int attempts; - xfs_ino_t e_inum; - xfs_inode_t *ips[2]; - xfs_log_item_t *lp; - -#ifdef DEBUG - xfs_rm_locks++; -#endif - attempts = 0; - -again: - xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT); - - e_inum = ip->i_ino; - - xfs_itrace_ref(ip); - - /* - * We want to lock in increasing inum. Since we've already - * acquired the lock on the directory, we may need to release - * if if the inum of the entry turns out to be less. - */ - if (e_inum > dp->i_ino) { - /* - * We are already in the right order, so just - * lock on the inode of the entry. - * We need to use nowait if dp is in the AIL. - */ - - lp = (xfs_log_item_t *)dp->i_itemp; - if (lp && (lp->li_flags & XFS_LI_IN_AIL)) { - if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) { - attempts++; -#ifdef DEBUG - xfs_rm_attempts++; -#endif - - /* - * Unlock dp and try again. - * xfs_iunlock will try to push the tail - * if the inode is in the AIL. - */ - - xfs_iunlock(dp, XFS_ILOCK_EXCL); - - if ((attempts % 5) == 0) { - delay(1); /* Don't just spin the CPU */ -#ifdef DEBUG - xfs_rm_lock_delays++; -#endif - } - goto again; - } - } else { - xfs_ilock(ip, XFS_ILOCK_EXCL); - } - } else if (e_inum < dp->i_ino) { - xfs_iunlock(dp, XFS_ILOCK_EXCL); - - ips[0] = ip; - ips[1] = dp; - xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL); - } - /* else e_inum == dp->i_ino */ - /* This can happen if we're asked to lock /x/.. - * the entry is "..", which is also the parent directory. - */ - - return 0; -} - -#ifdef DEBUG -int xfs_locked_n; -int xfs_small_retries; -int xfs_middle_retries; -int xfs_lots_retries; -int xfs_lock_delays; -#endif - -/* - * Bump the subclass so xfs_lock_inodes() acquires each lock with - * a different value - */ -static inline int -xfs_lock_inumorder(int lock_mode, int subclass) -{ - if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) - lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT; - if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) - lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT; - - return lock_mode; -} - -/* - * The following routine will lock n inodes in exclusive mode. - * We assume the caller calls us with the inodes in i_ino order. - * - * We need to detect deadlock where an inode that we lock - * is in the AIL and we start waiting for another inode that is locked - * by a thread in a long running transaction (such as truncate). This can - * result in deadlock since the long running trans might need to wait - * for the inode we just locked in order to push the tail and free space - * in the log. - */ -void -xfs_lock_inodes( - xfs_inode_t **ips, - int inodes, - int first_locked, - uint lock_mode) -{ - int attempts = 0, i, j, try_lock; - xfs_log_item_t *lp; - - ASSERT(ips && (inodes >= 2)); /* we need at least two */ - - if (first_locked) { - try_lock = 1; - i = 1; - } else { - try_lock = 0; - i = 0; - } - -again: - for (; i < inodes; i++) { - ASSERT(ips[i]); - - if (i && (ips[i] == ips[i-1])) /* Already locked */ - continue; - - /* - * If try_lock is not set yet, make sure all locked inodes - * are not in the AIL. - * If any are, set try_lock to be used later. - */ - - if (!try_lock) { - for (j = (i - 1); j >= 0 && !try_lock; j--) { - lp = (xfs_log_item_t *)ips[j]->i_itemp; - if (lp && (lp->li_flags & XFS_LI_IN_AIL)) { - try_lock++; - } - } - } - - /* - * If any of the previous locks we have locked is in the AIL, - * we must TRY to get the second and subsequent locks. If - * we can't get any, we must release all we have - * and try again. - */ - - if (try_lock) { - /* try_lock must be 0 if i is 0. */ - /* - * try_lock means we have an inode locked - * that is in the AIL. - */ - ASSERT(i != 0); - if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) { - attempts++; - - /* - * Unlock all previous guys and try again. - * xfs_iunlock will try to push the tail - * if the inode is in the AIL. - */ - - for(j = i - 1; j >= 0; j--) { - - /* - * Check to see if we've already - * unlocked this one. - * Not the first one going back, - * and the inode ptr is the same. - */ - if ((j != (i - 1)) && ips[j] == - ips[j+1]) - continue; - - xfs_iunlock(ips[j], lock_mode); - } - - if ((attempts % 5) == 0) { - delay(1); /* Don't just spin the CPU */ -#ifdef DEBUG - xfs_lock_delays++; -#endif - } - i = 0; - try_lock = 0; - goto again; - } - } else { - xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i)); - } - } - -#ifdef DEBUG - if (attempts) { - if (attempts < 5) xfs_small_retries++; - else if (attempts < 100) xfs_middle_retries++; - else xfs_lots_retries++; - } else { - xfs_locked_n++; - } -#endif -} - -#ifdef DEBUG -#define REMOVE_DEBUG_TRACE(x) {remove_which_error_return = (x);} -int remove_which_error_return = 0; -#else /* ! DEBUG */ -#define REMOVE_DEBUG_TRACE(x) -#endif /* ! DEBUG */ - -int -xfs_remove( - xfs_inode_t *dp, - bhv_vname_t *dentry) -{ - bhv_vnode_t *dir_vp = XFS_ITOV(dp); - char *name = VNAME(dentry); - xfs_mount_t *mp = dp->i_mount; - xfs_inode_t *ip; - xfs_trans_t *tp = NULL; - int error = 0; - xfs_bmap_free_t free_list; - xfs_fsblock_t first_block; - int cancel_flags; - int committed; - int dm_di_mode = 0; - int link_zero; - uint resblks; - int namelen; - - xfs_itrace_entry(dp); - - if (XFS_FORCED_SHUTDOWN(mp)) - return XFS_ERROR(EIO); - - namelen = VNAMELEN(dentry); - - if (!xfs_get_dir_entry(dentry, &ip)) { - dm_di_mode = ip->i_d.di_mode; - IRELE(ip); - } - - if (DM_EVENT_ENABLED(dp, DM_EVENT_REMOVE)) { - error = XFS_SEND_NAMESP(mp, DM_EVENT_REMOVE, dir_vp, - DM_RIGHT_NULL, NULL, DM_RIGHT_NULL, - name, NULL, dm_di_mode, 0, 0); - if (error) - return error; - } - - /* From this point on, return through std_return */ - ip = NULL; - - /* - * We need to get a reference to ip before we get our log - * reservation. The reason for this is that we cannot call - * xfs_iget for an inode for which we do not have a reference - * once we've acquired a log reservation. This is because the - * inode we are trying to get might be in xfs_inactive going - * for a log reservation. Since we'll have to wait for the - * inactive code to complete before returning from xfs_iget, - * we need to make sure that we don't have log space reserved - * when we call xfs_iget. Instead we get an unlocked reference - * to the inode before getting our log reservation. - */ - error = xfs_get_dir_entry(dentry, &ip); - if (error) { - REMOVE_DEBUG_TRACE(__LINE__); - goto std_return; - } - - dm_di_mode = ip->i_d.di_mode; - - xfs_itrace_entry(ip); - xfs_itrace_ref(ip); - - error = XFS_QM_DQATTACH(mp, dp, 0); - if (!error && dp != ip) - error = XFS_QM_DQATTACH(mp, ip, 0); - if (error) { - REMOVE_DEBUG_TRACE(__LINE__); - IRELE(ip); - goto std_return; - } - - tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE); - cancel_flags = XFS_TRANS_RELEASE_LOG_RES; - /* - * We try to get the real space reservation first, - * allowing for directory btree deletion(s) implying - * possible bmap insert(s). If we can't get the space - * reservation then we use 0 instead, and avoid the bmap - * btree insert(s) in the directory code by, if the bmap - * insert tries to happen, instead trimming the LAST - * block from the directory. - */ - resblks = XFS_REMOVE_SPACE_RES(mp); - error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, XFS_REMOVE_LOG_COUNT); - if (error == ENOSPC) { - resblks = 0; - error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, XFS_REMOVE_LOG_COUNT); - } - if (error) { - ASSERT(error != ENOSPC); - REMOVE_DEBUG_TRACE(__LINE__); - xfs_trans_cancel(tp, 0); - IRELE(ip); - return error; - } - - error = xfs_lock_dir_and_entry(dp, ip); - if (error) { - REMOVE_DEBUG_TRACE(__LINE__); - xfs_trans_cancel(tp, cancel_flags); - IRELE(ip); - goto std_return; - } - - /* - * At this point, we've gotten both the directory and the entry - * inodes locked. - */ - xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); - if (dp != ip) { - /* - * Increment vnode ref count only in this case since - * there's an extra vnode reference in the case where - * dp == ip. - */ - IHOLD(dp); - xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); - } - - /* - * Entry must exist since we did a lookup in xfs_lock_dir_and_entry. - */ - XFS_BMAP_INIT(&free_list, &first_block); - error = xfs_dir_removename(tp, dp, name, namelen, ip->i_ino, - &first_block, &free_list, 0); - if (error) { - ASSERT(error != ENOENT); - REMOVE_DEBUG_TRACE(__LINE__); - goto error1; - } - xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); - - dp->i_gen++; - xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); - - error = xfs_droplink(tp, ip); - if (error) { - REMOVE_DEBUG_TRACE(__LINE__); - goto error1; - } - - /* Determine if this is the last link while - * we are in the transaction. - */ - link_zero = (ip)->i_d.di_nlink==0; - - /* - * Take an extra ref on the inode so that it doesn't - * go to xfs_inactive() from within the commit. - */ - IHOLD(ip); - - /* - * If this is a synchronous mount, make sure that the - * remove transaction goes to disk before returning to - * the user. - */ - if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { - xfs_trans_set_sync(tp); - } - - error = xfs_bmap_finish(&tp, &free_list, &committed); - if (error) { - REMOVE_DEBUG_TRACE(__LINE__); - goto error_rele; - } - - error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); - if (error) { - IRELE(ip); - goto std_return; - } - - /* - * Before we drop our extra reference to the inode, purge it - * from the refcache if it is there. By waiting until afterwards - * to do the IRELE, we ensure that we won't go inactive in the - * xfs_refcache_purge_ip routine (although that would be OK). - */ - xfs_refcache_purge_ip(ip); - - /* - * If we are using filestreams, kill the stream association. - * If the file is still open it may get a new one but that - * will get killed on last close in xfs_close() so we don't - * have to worry about that. - */ - if (link_zero && xfs_inode_is_filestream(ip)) - xfs_filestream_deassociate(ip); - - xfs_itrace_exit(ip); - IRELE(ip); - -/* Fall through to std_return with error = 0 */ - std_return: - if (DM_EVENT_ENABLED(dp, DM_EVENT_POSTREMOVE)) { - (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTREMOVE, - dir_vp, DM_RIGHT_NULL, - NULL, DM_RIGHT_NULL, - name, NULL, dm_di_mode, error, 0); - } - return error; - - error1: - xfs_bmap_cancel(&free_list); - cancel_flags |= XFS_TRANS_ABORT; - xfs_trans_cancel(tp, cancel_flags); - goto std_return; - - error_rele: - /* - * In this case make sure to not release the inode until after - * the current transaction is aborted. Releasing it beforehand - * can cause us to go to xfs_inactive and start a recursive - * transaction which can easily deadlock with the current one. - */ - xfs_bmap_cancel(&free_list); - cancel_flags |= XFS_TRANS_ABORT; - xfs_trans_cancel(tp, cancel_flags); - - /* - * Before we drop our extra reference to the inode, purge it - * from the refcache if it is there. By waiting until afterwards - * to do the IRELE, we ensure that we won't go inactive in the - * xfs_refcache_purge_ip routine (although that would be OK). - */ - xfs_refcache_purge_ip(ip); - - IRELE(ip); - - goto std_return; -} - -int -xfs_link( - xfs_inode_t *tdp, - bhv_vnode_t *src_vp, - bhv_vname_t *dentry) -{ - bhv_vnode_t *target_dir_vp = XFS_ITOV(tdp); - xfs_mount_t *mp = tdp->i_mount; - xfs_inode_t *sip = xfs_vtoi(src_vp); - xfs_trans_t *tp; - xfs_inode_t *ips[2]; - int error; - xfs_bmap_free_t free_list; - xfs_fsblock_t first_block; - int cancel_flags; - int committed; - int resblks; - char *target_name = VNAME(dentry); - int target_namelen; - - xfs_itrace_entry(tdp); - xfs_itrace_entry(xfs_vtoi(src_vp)); - - target_namelen = VNAMELEN(dentry); - ASSERT(!VN_ISDIR(src_vp)); - - if (XFS_FORCED_SHUTDOWN(mp)) - return XFS_ERROR(EIO); - - if (DM_EVENT_ENABLED(tdp, DM_EVENT_LINK)) { - error = XFS_SEND_NAMESP(mp, DM_EVENT_LINK, - target_dir_vp, DM_RIGHT_NULL, - src_vp, DM_RIGHT_NULL, - target_name, NULL, 0, 0, 0); - if (error) - return error; - } - - /* Return through std_return after this point. */ - - error = XFS_QM_DQATTACH(mp, sip, 0); - if (!error && sip != tdp) - error = XFS_QM_DQATTACH(mp, tdp, 0); - if (error) - goto std_return; - - tp = xfs_trans_alloc(mp, XFS_TRANS_LINK); - cancel_flags = XFS_TRANS_RELEASE_LOG_RES; - resblks = XFS_LINK_SPACE_RES(mp, target_namelen); - error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT); - if (error == ENOSPC) { - resblks = 0; - error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT); - } - if (error) { - cancel_flags = 0; - goto error_return; - } - - if (sip->i_ino < tdp->i_ino) { - ips[0] = sip; - ips[1] = tdp; - } else { - ips[0] = tdp; - ips[1] = sip; - } - - xfs_lock_inodes(ips, 2, 0, XFS_ILOCK_EXCL); - - /* - * Increment vnode ref counts since xfs_trans_commit & - * xfs_trans_cancel will both unlock the inodes and - * decrement the associated ref counts. - */ - VN_HOLD(src_vp); - VN_HOLD(target_dir_vp); - xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL); - xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL); - - /* - * If the source has too many links, we can't make any more to it. - */ - if (sip->i_d.di_nlink >= XFS_MAXLINK) { - error = XFS_ERROR(EMLINK); - goto error_return; - } - - /* - * If we are using project inheritance, we only allow hard link - * creation in our tree when the project IDs are the same; else - * the tree quota mechanism could be circumvented. - */ - if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && - (tdp->i_d.di_projid != sip->i_d.di_projid))) { - error = XFS_ERROR(EXDEV); - goto error_return; - } - - if (resblks == 0 && - (error = xfs_dir_canenter(tp, tdp, target_name, target_namelen))) - goto error_return; - - XFS_BMAP_INIT(&free_list, &first_block); - - error = xfs_dir_createname(tp, tdp, target_name, target_namelen, - sip->i_ino, &first_block, &free_list, - resblks); - if (error) - goto abort_return; - xfs_ichgtime(tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); - tdp->i_gen++; - xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE); - - error = xfs_bumplink(tp, sip); - if (error) - goto abort_return; - - /* - * If this is a synchronous mount, make sure that the - * link transaction goes to disk before returning to - * the user. - */ - if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { - xfs_trans_set_sync(tp); - } - - error = xfs_bmap_finish (&tp, &free_list, &committed); - if (error) { - xfs_bmap_cancel(&free_list); - goto abort_return; - } - - error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); - if (error) - goto std_return; - - /* Fall through to std_return with error = 0. */ -std_return: - if (DM_EVENT_ENABLED(sip, DM_EVENT_POSTLINK)) { - (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTLINK, - target_dir_vp, DM_RIGHT_NULL, - src_vp, DM_RIGHT_NULL, - target_name, NULL, 0, error, 0); - } - return error; - - abort_return: - cancel_flags |= XFS_TRANS_ABORT; - /* FALLTHROUGH */ - - error_return: - xfs_trans_cancel(tp, cancel_flags); - goto std_return; -} - - -int -xfs_mkdir( - xfs_inode_t *dp, - bhv_vname_t *dentry, - mode_t mode, - bhv_vnode_t **vpp, - cred_t *credp) -{ - bhv_vnode_t *dir_vp = XFS_ITOV(dp); - char *dir_name = VNAME(dentry); - int dir_namelen = VNAMELEN(dentry); - xfs_mount_t *mp = dp->i_mount; - xfs_inode_t *cdp; /* inode of created dir */ - bhv_vnode_t *cvp; /* vnode of created dir */ - xfs_trans_t *tp; - int cancel_flags; - int error; - int committed; - xfs_bmap_free_t free_list; - xfs_fsblock_t first_block; - boolean_t unlock_dp_on_error = B_FALSE; - boolean_t created = B_FALSE; - int dm_event_sent = 0; - xfs_prid_t prid; - struct xfs_dquot *udqp, *gdqp; - uint resblks; - - if (XFS_FORCED_SHUTDOWN(mp)) - return XFS_ERROR(EIO); - - tp = NULL; - - if (DM_EVENT_ENABLED(dp, DM_EVENT_CREATE)) { - error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE, - dir_vp, DM_RIGHT_NULL, NULL, - DM_RIGHT_NULL, dir_name, NULL, - mode, 0, 0); - if (error) - return error; - dm_event_sent = 1; - } - - /* Return through std_return after this point. */ - - xfs_itrace_entry(dp); - - mp = dp->i_mount; - udqp = gdqp = NULL; - if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) - prid = dp->i_d.di_projid; - else - prid = (xfs_prid_t)dfltprid; - - /* - * Make sure that we have allocated dquot(s) on disk. - */ - error = XFS_QM_DQVOPALLOC(mp, dp, - current_fsuid(credp), current_fsgid(credp), prid, - XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp); - if (error) - goto std_return; - - tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR); - cancel_flags = XFS_TRANS_RELEASE_LOG_RES; - resblks = XFS_MKDIR_SPACE_RES(mp, dir_namelen); - error = xfs_trans_reserve(tp, resblks, XFS_MKDIR_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, XFS_MKDIR_LOG_COUNT); - if (error == ENOSPC) { - resblks = 0; - error = xfs_trans_reserve(tp, 0, XFS_MKDIR_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, - XFS_MKDIR_LOG_COUNT); - } - if (error) { - cancel_flags = 0; - goto error_return; - } - - xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT); - unlock_dp_on_error = B_TRUE; - - /* - * Check for directory link count overflow. - */ - if (dp->i_d.di_nlink >= XFS_MAXLINK) { - error = XFS_ERROR(EMLINK); - goto error_return; - } - - /* - * Reserve disk quota and the inode. - */ - error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0); - if (error) - goto error_return; - - if (resblks == 0 && - (error = xfs_dir_canenter(tp, dp, dir_name, dir_namelen))) - goto error_return; - /* - * create the directory inode. - */ - error = xfs_dir_ialloc(&tp, dp, mode, 2, - 0, credp, prid, resblks > 0, - &cdp, NULL); - if (error) { - if (error == ENOSPC) - goto error_return; - goto abort_return; - } - xfs_itrace_ref(cdp); - - /* - * Now we add the directory inode to the transaction. - * We waited until now since xfs_dir_ialloc might start - * a new transaction. Had we joined the transaction - * earlier, the locks might have gotten released. An error - * from here on will result in the transaction cancel - * unlocking dp so don't do it explicitly in the error path. - */ - VN_HOLD(dir_vp); - xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); - unlock_dp_on_error = B_FALSE; - - XFS_BMAP_INIT(&free_list, &first_block); - - error = xfs_dir_createname(tp, dp, dir_name, dir_namelen, cdp->i_ino, - &first_block, &free_list, resblks ? - resblks - XFS_IALLOC_SPACE_RES(mp) : 0); - if (error) { - ASSERT(error != ENOSPC); - goto error1; - } - xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); - - /* - * Bump the in memory version number of the parent directory - * so that other processes accessing it will recognize that - * the directory has changed. - */ - dp->i_gen++; - - error = xfs_dir_init(tp, cdp, dp); - if (error) - goto error2; - - cdp->i_gen = 1; - error = xfs_bumplink(tp, dp); - if (error) - goto error2; - - cvp = XFS_ITOV(cdp); - - created = B_TRUE; - - *vpp = cvp; - IHOLD(cdp); - - /* - * Attach the dquots to the new inode and modify the icount incore. - */ - XFS_QM_DQVOPCREATE(mp, tp, cdp, udqp, gdqp); - - /* - * If this is a synchronous mount, make sure that the - * mkdir transaction goes to disk before returning to - * the user. - */ - if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { - xfs_trans_set_sync(tp); - } - - error = xfs_bmap_finish(&tp, &free_list, &committed); - if (error) { - IRELE(cdp); - goto error2; - } - - error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); - XFS_QM_DQRELE(mp, udqp); - XFS_QM_DQRELE(mp, gdqp); - if (error) { - IRELE(cdp); - } - - /* Fall through to std_return with error = 0 or errno from - * xfs_trans_commit. */ - -std_return: - if ((created || (error != 0 && dm_event_sent != 0)) && - DM_EVENT_ENABLED(dp, DM_EVENT_POSTCREATE)) { - (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTCREATE, - dir_vp, DM_RIGHT_NULL, - created ? XFS_ITOV(cdp):NULL, - DM_RIGHT_NULL, - dir_name, NULL, - mode, error, 0); - } - return error; - - error2: - error1: - xfs_bmap_cancel(&free_list); - abort_return: - cancel_flags |= XFS_TRANS_ABORT; - error_return: - xfs_trans_cancel(tp, cancel_flags); - XFS_QM_DQRELE(mp, udqp); - XFS_QM_DQRELE(mp, gdqp); - - if (unlock_dp_on_error) - xfs_iunlock(dp, XFS_ILOCK_EXCL); - - goto std_return; -} - -int -xfs_rmdir( - xfs_inode_t *dp, - bhv_vname_t *dentry) -{ - bhv_vnode_t *dir_vp = XFS_ITOV(dp); - char *name = VNAME(dentry); - int namelen = VNAMELEN(dentry); - xfs_mount_t *mp = dp->i_mount; - xfs_inode_t *cdp; /* child directory */ - xfs_trans_t *tp; - int error; - xfs_bmap_free_t free_list; - xfs_fsblock_t first_block; - int cancel_flags; - int committed; - int dm_di_mode = S_IFDIR; - int last_cdp_link; - uint resblks; - - xfs_itrace_entry(dp); - - if (XFS_FORCED_SHUTDOWN(mp)) - return XFS_ERROR(EIO); - - if (!xfs_get_dir_entry(dentry, &cdp)) { - dm_di_mode = cdp->i_d.di_mode; - IRELE(cdp); - } - - if (DM_EVENT_ENABLED(dp, DM_EVENT_REMOVE)) { - error = XFS_SEND_NAMESP(mp, DM_EVENT_REMOVE, - dir_vp, DM_RIGHT_NULL, - NULL, DM_RIGHT_NULL, - name, NULL, dm_di_mode, 0, 0); - if (error) - return XFS_ERROR(error); - } - - /* Return through std_return after this point. */ - - cdp = NULL; - - /* - * We need to get a reference to cdp before we get our log - * reservation. The reason for this is that we cannot call - * xfs_iget for an inode for which we do not have a reference - * once we've acquired a log reservation. This is because the - * inode we are trying to get might be in xfs_inactive going - * for a log reservation. Since we'll have to wait for the - * inactive code to complete before returning from xfs_iget, - * we need to make sure that we don't have log space reserved - * when we call xfs_iget. Instead we get an unlocked reference - * to the inode before getting our log reservation. - */ - error = xfs_get_dir_entry(dentry, &cdp); - if (error) { - REMOVE_DEBUG_TRACE(__LINE__); - goto std_return; - } - mp = dp->i_mount; - dm_di_mode = cdp->i_d.di_mode; - - /* - * Get the dquots for the inodes. - */ - error = XFS_QM_DQATTACH(mp, dp, 0); - if (!error && dp != cdp) - error = XFS_QM_DQATTACH(mp, cdp, 0); - if (error) { - IRELE(cdp); - REMOVE_DEBUG_TRACE(__LINE__); - goto std_return; - } - - tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR); - cancel_flags = XFS_TRANS_RELEASE_LOG_RES; - /* - * We try to get the real space reservation first, - * allowing for directory btree deletion(s) implying - * possible bmap insert(s). If we can't get the space - * reservation then we use 0 instead, and avoid the bmap - * btree insert(s) in the directory code by, if the bmap - * insert tries to happen, instead trimming the LAST - * block from the directory. - */ - resblks = XFS_REMOVE_SPACE_RES(mp); - error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, XFS_DEFAULT_LOG_COUNT); - if (error == ENOSPC) { - resblks = 0; - error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, XFS_DEFAULT_LOG_COUNT); - } - if (error) { - ASSERT(error != ENOSPC); - cancel_flags = 0; - IRELE(cdp); - goto error_return; - } - XFS_BMAP_INIT(&free_list, &first_block); - - /* - * Now lock the child directory inode and the parent directory - * inode in the proper order. This will take care of validating - * that the directory entry for the child directory inode has - * not changed while we were obtaining a log reservation. - */ - error = xfs_lock_dir_and_entry(dp, cdp); - if (error) { - xfs_trans_cancel(tp, cancel_flags); - IRELE(cdp); - goto std_return; - } - - xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); - if (dp != cdp) { - /* - * Only increment the parent directory vnode count if - * we didn't bump it in looking up cdp. The only time - * we don't bump it is when we're looking up ".". - */ - VN_HOLD(dir_vp); - } - - xfs_itrace_ref(cdp); - xfs_trans_ijoin(tp, cdp, XFS_ILOCK_EXCL); - - ASSERT(cdp->i_d.di_nlink >= 2); - if (cdp->i_d.di_nlink != 2) { - error = XFS_ERROR(ENOTEMPTY); - goto error_return; - } - if (!xfs_dir_isempty(cdp)) { - error = XFS_ERROR(ENOTEMPTY); - goto error_return; - } - - error = xfs_dir_removename(tp, dp, name, namelen, cdp->i_ino, - &first_block, &free_list, resblks); - if (error) - goto error1; - - xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); - - /* - * Bump the in memory generation count on the parent - * directory so that other can know that it has changed. - */ - dp->i_gen++; - - /* - * Drop the link from cdp's "..". - */ - error = xfs_droplink(tp, dp); - if (error) { - goto error1; - } - - /* - * Drop the link from dp to cdp. - */ - error = xfs_droplink(tp, cdp); - if (error) { - goto error1; - } - - /* - * Drop the "." link from cdp to self. - */ - error = xfs_droplink(tp, cdp); - if (error) { - goto error1; - } - - /* Determine these before committing transaction */ - last_cdp_link = (cdp)->i_d.di_nlink==0; - - /* - * Take an extra ref on the child vnode so that it - * does not go to xfs_inactive() from within the commit. - */ - IHOLD(cdp); - - /* - * If this is a synchronous mount, make sure that the - * rmdir transaction goes to disk before returning to - * the user. - */ - if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { - xfs_trans_set_sync(tp); - } - - error = xfs_bmap_finish (&tp, &free_list, &committed); - if (error) { - xfs_bmap_cancel(&free_list); - xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | - XFS_TRANS_ABORT)); - IRELE(cdp); - goto std_return; - } - - error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); - if (error) { - IRELE(cdp); - goto std_return; - } - - - IRELE(cdp); - - /* Fall through to std_return with error = 0 or the errno - * from xfs_trans_commit. */ - std_return: - if (DM_EVENT_ENABLED(dp, DM_EVENT_POSTREMOVE)) { - (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTREMOVE, - dir_vp, DM_RIGHT_NULL, - NULL, DM_RIGHT_NULL, - name, NULL, dm_di_mode, - error, 0); - } - return error; - - error1: - xfs_bmap_cancel(&free_list); - cancel_flags |= XFS_TRANS_ABORT; - /* FALLTHROUGH */ - - error_return: - xfs_trans_cancel(tp, cancel_flags); - goto std_return; -} - -int -xfs_symlink( - xfs_inode_t *dp, - bhv_vname_t *dentry, - char *target_path, - mode_t mode, - bhv_vnode_t **vpp, - cred_t *credp) -{ - bhv_vnode_t *dir_vp = XFS_ITOV(dp); - xfs_mount_t *mp = dp->i_mount; - xfs_trans_t *tp; - xfs_inode_t *ip; - int error; - int pathlen; - xfs_bmap_free_t free_list; - xfs_fsblock_t first_block; - boolean_t unlock_dp_on_error = B_FALSE; - uint cancel_flags; - int committed; - xfs_fileoff_t first_fsb; - xfs_filblks_t fs_blocks; - int nmaps; - xfs_bmbt_irec_t mval[SYMLINK_MAPS]; - xfs_daddr_t d; - char *cur_chunk; - int byte_cnt; - int n; - xfs_buf_t *bp; - xfs_prid_t prid; - struct xfs_dquot *udqp, *gdqp; - uint resblks; - char *link_name = VNAME(dentry); - int link_namelen; - - *vpp = NULL; - error = 0; - ip = NULL; - tp = NULL; - - xfs_itrace_entry(dp); - - if (XFS_FORCED_SHUTDOWN(mp)) - return XFS_ERROR(EIO); - - link_namelen = VNAMELEN(dentry); - - /* - * Check component lengths of the target path name. - */ - pathlen = strlen(target_path); - if (pathlen >= MAXPATHLEN) /* total string too long */ - return XFS_ERROR(ENAMETOOLONG); - if (pathlen >= MAXNAMELEN) { /* is any component too long? */ - int len, total; - char *path; - - for (total = 0, path = target_path; total < pathlen;) { - /* - * Skip any slashes. - */ - while(*path == '/') { - total++; - path++; - } - - /* - * Count up to the next slash or end of path. - * Error out if the component is bigger than MAXNAMELEN. - */ - for(len = 0; *path != '/' && total < pathlen;total++, path++) { - if (++len >= MAXNAMELEN) { - error = ENAMETOOLONG; - return error; - } - } - } - } - - if (DM_EVENT_ENABLED(dp, DM_EVENT_SYMLINK)) { - error = XFS_SEND_NAMESP(mp, DM_EVENT_SYMLINK, dir_vp, - DM_RIGHT_NULL, NULL, DM_RIGHT_NULL, - link_name, target_path, 0, 0, 0); - if (error) - return error; - } - - /* Return through std_return after this point. */ - - udqp = gdqp = NULL; - if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) - prid = dp->i_d.di_projid; - else - prid = (xfs_prid_t)dfltprid; - - /* - * Make sure that we have allocated dquot(s) on disk. - */ - error = XFS_QM_DQVOPALLOC(mp, dp, - current_fsuid(credp), current_fsgid(credp), prid, - XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp); - if (error) - goto std_return; - - tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK); - cancel_flags = XFS_TRANS_RELEASE_LOG_RES; - /* - * The symlink will fit into the inode data fork? - * There can't be any attributes so we get the whole variable part. - */ - if (pathlen <= XFS_LITINO(mp)) - fs_blocks = 0; - else - fs_blocks = XFS_B_TO_FSB(mp, pathlen); - resblks = XFS_SYMLINK_SPACE_RES(mp, link_namelen, fs_blocks); - error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT); - if (error == ENOSPC && fs_blocks == 0) { - resblks = 0; - error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT); - } - if (error) { - cancel_flags = 0; - goto error_return; - } - - xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT); - unlock_dp_on_error = B_TRUE; - - /* - * Check whether the directory allows new symlinks or not. - */ - if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) { - error = XFS_ERROR(EPERM); - goto error_return; - } - - /* - * Reserve disk quota : blocks and inode. - */ - error = XFS_TRANS_RESERVE_QUOTA(mp, tp, udqp, gdqp, resblks, 1, 0); - if (error) - goto error_return; - - /* - * Check for ability to enter directory entry, if no space reserved. - */ - if (resblks == 0 && - (error = xfs_dir_canenter(tp, dp, link_name, link_namelen))) - goto error_return; - /* - * Initialize the bmap freelist prior to calling either - * bmapi or the directory create code. - */ - XFS_BMAP_INIT(&free_list, &first_block); - - /* - * Allocate an inode for the symlink. - */ - error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), - 1, 0, credp, prid, resblks > 0, &ip, NULL); - if (error) { - if (error == ENOSPC) - goto error_return; - goto error1; - } - xfs_itrace_ref(ip); - - /* - * An error after we've joined dp to the transaction will result in the - * transaction cancel unlocking dp so don't do it explicitly in the - * error path. - */ - VN_HOLD(dir_vp); - xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); - unlock_dp_on_error = B_FALSE; - - /* - * Also attach the dquot(s) to it, if applicable. - */ - XFS_QM_DQVOPCREATE(mp, tp, ip, udqp, gdqp); - - if (resblks) - resblks -= XFS_IALLOC_SPACE_RES(mp); - /* - * If the symlink will fit into the inode, write it inline. - */ - if (pathlen <= XFS_IFORK_DSIZE(ip)) { - xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK); - memcpy(ip->i_df.if_u1.if_data, target_path, pathlen); - ip->i_d.di_size = pathlen; - - /* - * The inode was initially created in extent format. - */ - ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT); - ip->i_df.if_flags |= XFS_IFINLINE; - - ip->i_d.di_format = XFS_DINODE_FMT_LOCAL; - xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE); - - } else { - first_fsb = 0; - nmaps = SYMLINK_MAPS; - - error = xfs_bmapi(tp, ip, first_fsb, fs_blocks, - XFS_BMAPI_WRITE | XFS_BMAPI_METADATA, - &first_block, resblks, mval, &nmaps, - &free_list, NULL); - if (error) { - goto error1; - } - - if (resblks) - resblks -= fs_blocks; - ip->i_d.di_size = pathlen; - xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); - - cur_chunk = target_path; - for (n = 0; n < nmaps; n++) { - d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock); - byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount); - bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d, - BTOBB(byte_cnt), 0); - ASSERT(bp && !XFS_BUF_GETERROR(bp)); - if (pathlen < byte_cnt) { - byte_cnt = pathlen; - } - pathlen -= byte_cnt; - - memcpy(XFS_BUF_PTR(bp), cur_chunk, byte_cnt); - cur_chunk += byte_cnt; - - xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1); - } - } - - /* - * Create the directory entry for the symlink. - */ - error = xfs_dir_createname(tp, dp, link_name, link_namelen, ip->i_ino, - &first_block, &free_list, resblks); - if (error) - goto error1; - xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); - xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); - - /* - * Bump the in memory version number of the parent directory - * so that other processes accessing it will recognize that - * the directory has changed. - */ - dp->i_gen++; - - /* - * If this is a synchronous mount, make sure that the - * symlink transaction goes to disk before returning to - * the user. - */ - if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { - xfs_trans_set_sync(tp); - } - - /* - * xfs_trans_commit normally decrements the vnode ref count - * when it unlocks the inode. Since we want to return the - * vnode to the caller, we bump the vnode ref count now. - */ - IHOLD(ip); - - error = xfs_bmap_finish(&tp, &free_list, &committed); - if (error) { - goto error2; - } - error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); - XFS_QM_DQRELE(mp, udqp); - XFS_QM_DQRELE(mp, gdqp); - - /* Fall through to std_return with error = 0 or errno from - * xfs_trans_commit */ -std_return: - if (DM_EVENT_ENABLED(dp, DM_EVENT_POSTSYMLINK)) { - (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTSYMLINK, - dir_vp, DM_RIGHT_NULL, - error ? NULL : XFS_ITOV(ip), - DM_RIGHT_NULL, link_name, target_path, - 0, error, 0); - } - - if (!error) { - bhv_vnode_t *vp; - - ASSERT(ip); - vp = XFS_ITOV(ip); - *vpp = vp; - } - return error; - - error2: - IRELE(ip); - error1: - xfs_bmap_cancel(&free_list); - cancel_flags |= XFS_TRANS_ABORT; - error_return: - xfs_trans_cancel(tp, cancel_flags); - XFS_QM_DQRELE(mp, udqp); - XFS_QM_DQRELE(mp, gdqp); - - if (unlock_dp_on_error) - xfs_iunlock(dp, XFS_ILOCK_EXCL); - - goto std_return; -} - -int -xfs_rwlock( - xfs_inode_t *ip, - bhv_vrwlock_t locktype) -{ - if (S_ISDIR(ip->i_d.di_mode)) - return 1; - if (locktype == VRWLOCK_WRITE) { - xfs_ilock(ip, XFS_IOLOCK_EXCL); - } else if (locktype == VRWLOCK_TRY_READ) { - return xfs_ilock_nowait(ip, XFS_IOLOCK_SHARED); - } else if (locktype == VRWLOCK_TRY_WRITE) { - return xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL); - } else { - ASSERT((locktype == VRWLOCK_READ) || - (locktype == VRWLOCK_WRITE_DIRECT)); - xfs_ilock(ip, XFS_IOLOCK_SHARED); - } - - return 1; -} - - -void -xfs_rwunlock( - xfs_inode_t *ip, - bhv_vrwlock_t locktype) -{ - if (S_ISDIR(ip->i_d.di_mode)) - return; - if (locktype == VRWLOCK_WRITE) { - /* - * In the write case, we may have added a new entry to - * the reference cache. This might store a pointer to - * an inode to be released in this inode. If it is there, - * clear the pointer and release the inode after unlocking - * this one. - */ - xfs_refcache_iunlock(ip, XFS_IOLOCK_EXCL); - } else { - ASSERT((locktype == VRWLOCK_READ) || - (locktype == VRWLOCK_WRITE_DIRECT)); - xfs_iunlock(ip, XFS_IOLOCK_SHARED); - } - return; -} - - -int -xfs_inode_flush( - xfs_inode_t *ip, - int flags) -{ - xfs_mount_t *mp = ip->i_mount; - xfs_inode_log_item_t *iip = ip->i_itemp; - int error = 0; - - if (XFS_FORCED_SHUTDOWN(mp)) - return XFS_ERROR(EIO); - - /* - * Bypass inodes which have already been cleaned by - * the inode flush clustering code inside xfs_iflush - */ - if ((ip->i_update_core == 0) && - ((iip == NULL) || !(iip->ili_format.ilf_fields & XFS_ILOG_ALL))) - return 0; - - if (flags & FLUSH_LOG) { - if (iip && iip->ili_last_lsn) { - xlog_t *log = mp->m_log; - xfs_lsn_t sync_lsn; - int log_flags = XFS_LOG_FORCE; - - spin_lock(&log->l_grant_lock); - sync_lsn = log->l_last_sync_lsn; - spin_unlock(&log->l_grant_lock); - - if ((XFS_LSN_CMP(iip->ili_last_lsn, sync_lsn) > 0)) { - if (flags & FLUSH_SYNC) - log_flags |= XFS_LOG_SYNC; - error = xfs_log_force(mp, iip->ili_last_lsn, log_flags); - if (error) - return error; - } - - if (ip->i_update_core == 0) - return 0; - } - } - - /* - * We make this non-blocking if the inode is contended, - * return EAGAIN to indicate to the caller that they - * did not succeed. This prevents the flush path from - * blocking on inodes inside another operation right - * now, they get caught later by xfs_sync. - */ - if (flags & FLUSH_INODE) { - int flush_flags; - - if (flags & FLUSH_SYNC) { - xfs_ilock(ip, XFS_ILOCK_SHARED); - xfs_iflock(ip); - } else if (xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) { - if (xfs_ipincount(ip) || !xfs_iflock_nowait(ip)) { - xfs_iunlock(ip, XFS_ILOCK_SHARED); - return EAGAIN; - } - } else { - return EAGAIN; - } - - if (flags & FLUSH_SYNC) - flush_flags = XFS_IFLUSH_SYNC; - else - flush_flags = XFS_IFLUSH_ASYNC; - - error = xfs_iflush(ip, flush_flags); - xfs_iunlock(ip, XFS_ILOCK_SHARED); - } - - return error; -} - - -int -xfs_set_dmattrs( - xfs_inode_t *ip, - u_int evmask, - u_int16_t state) -{ - xfs_mount_t *mp = ip->i_mount; - xfs_trans_t *tp; - int error; - - if (!capable(CAP_SYS_ADMIN)) - return XFS_ERROR(EPERM); - - if (XFS_FORCED_SHUTDOWN(mp)) - return XFS_ERROR(EIO); - - tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS); - error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0); - if (error) { - xfs_trans_cancel(tp, 0); - return error; - } - xfs_ilock(ip, XFS_ILOCK_EXCL); - xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); - - ip->i_d.di_dmevmask = evmask; - ip->i_d.di_dmstate = state; - - xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); - IHOLD(ip); - error = xfs_trans_commit(tp, 0); - - return error; -} - -int -xfs_reclaim( - xfs_inode_t *ip) -{ - bhv_vnode_t *vp = XFS_ITOV(ip); - - xfs_itrace_entry(ip); - - ASSERT(!VN_MAPPED(vp)); - - /* bad inode, get out here ASAP */ - if (VN_BAD(vp)) { - xfs_ireclaim(ip); - return 0; - } - - vn_iowait(ip); - - ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0); - - /* - * Make sure the atime in the XFS inode is correct before freeing the - * Linux inode. - */ - xfs_synchronize_atime(ip); - - /* - * If we have nothing to flush with this inode then complete the - * teardown now, otherwise break the link between the xfs inode and the - * linux inode and clean up the xfs inode later. This avoids flushing - * the inode to disk during the delete operation itself. - * - * When breaking the link, we need to set the XFS_IRECLAIMABLE flag - * first to ensure that xfs_iunpin() will never see an xfs inode - * that has a linux inode being reclaimed. Synchronisation is provided - * by the i_flags_lock. - */ - if (!ip->i_update_core && (ip->i_itemp == NULL)) { - xfs_ilock(ip, XFS_ILOCK_EXCL); - xfs_iflock(ip); - return xfs_finish_reclaim(ip, 1, XFS_IFLUSH_DELWRI_ELSE_SYNC); - } else { - xfs_mount_t *mp = ip->i_mount; - - /* Protect sync and unpin from us */ - XFS_MOUNT_ILOCK(mp); - spin_lock(&ip->i_flags_lock); - __xfs_iflags_set(ip, XFS_IRECLAIMABLE); - vn_to_inode(vp)->i_private = NULL; - ip->i_vnode = NULL; - spin_unlock(&ip->i_flags_lock); - list_add_tail(&ip->i_reclaim, &mp->m_del_inodes); - XFS_MOUNT_IUNLOCK(mp); - } - return 0; -} - -int -xfs_finish_reclaim( - xfs_inode_t *ip, - int locked, - int sync_mode) -{ - xfs_perag_t *pag = xfs_get_perag(ip->i_mount, ip->i_ino); - bhv_vnode_t *vp = XFS_ITOV_NULL(ip); - int error; - - if (vp && VN_BAD(vp)) - goto reclaim; - - /* The hash lock here protects a thread in xfs_iget_core from - * racing with us on linking the inode back with a vnode. - * Once we have the XFS_IRECLAIM flag set it will not touch - * us. - */ - write_lock(&pag->pag_ici_lock); - spin_lock(&ip->i_flags_lock); - if (__xfs_iflags_test(ip, XFS_IRECLAIM) || - (!__xfs_iflags_test(ip, XFS_IRECLAIMABLE) && vp == NULL)) { - spin_unlock(&ip->i_flags_lock); - write_unlock(&pag->pag_ici_lock); - if (locked) { - xfs_ifunlock(ip); - xfs_iunlock(ip, XFS_ILOCK_EXCL); - } - return 1; - } - __xfs_iflags_set(ip, XFS_IRECLAIM); - spin_unlock(&ip->i_flags_lock); - write_unlock(&pag->pag_ici_lock); - xfs_put_perag(ip->i_mount, pag); - - /* - * If the inode is still dirty, then flush it out. If the inode - * is not in the AIL, then it will be OK to flush it delwri as - * long as xfs_iflush() does not keep any references to the inode. - * We leave that decision up to xfs_iflush() since it has the - * knowledge of whether it's OK to simply do a delwri flush of - * the inode or whether we need to wait until the inode is - * pulled from the AIL. - * We get the flush lock regardless, though, just to make sure - * we don't free it while it is being flushed. - */ - if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) { - if (!locked) { - xfs_ilock(ip, XFS_ILOCK_EXCL); - xfs_iflock(ip); - } - - if (ip->i_update_core || - ((ip->i_itemp != NULL) && - (ip->i_itemp->ili_format.ilf_fields != 0))) { - error = xfs_iflush(ip, sync_mode); - /* - * If we hit an error, typically because of filesystem - * shutdown, we don't need to let vn_reclaim to know - * because we're gonna reclaim the inode anyway. - */ - if (error) { - xfs_iunlock(ip, XFS_ILOCK_EXCL); - goto reclaim; - } - xfs_iflock(ip); /* synchronize with xfs_iflush_done */ - } - - ASSERT(ip->i_update_core == 0); - ASSERT(ip->i_itemp == NULL || - ip->i_itemp->ili_format.ilf_fields == 0); - xfs_iunlock(ip, XFS_ILOCK_EXCL); - } else if (locked) { - /* - * We are not interested in doing an iflush if we're - * in the process of shutting down the filesystem forcibly. - * So, just reclaim the inode. - */ - xfs_ifunlock(ip); - xfs_iunlock(ip, XFS_ILOCK_EXCL); - } - - reclaim: - xfs_ireclaim(ip); - return 0; -} - -int -xfs_finish_reclaim_all(xfs_mount_t *mp, int noblock) -{ - int purged; - xfs_inode_t *ip, *n; - int done = 0; - - while (!done) { - purged = 0; - XFS_MOUNT_ILOCK(mp); - list_for_each_entry_safe(ip, n, &mp->m_del_inodes, i_reclaim) { - if (noblock) { - if (xfs_ilock_nowait(ip, XFS_ILOCK_EXCL) == 0) - continue; - if (xfs_ipincount(ip) || - !xfs_iflock_nowait(ip)) { - xfs_iunlock(ip, XFS_ILOCK_EXCL); - continue; - } - } - XFS_MOUNT_IUNLOCK(mp); - if (xfs_finish_reclaim(ip, noblock, - XFS_IFLUSH_DELWRI_ELSE_ASYNC)) - delay(1); - purged = 1; - break; - } - - done = !purged; - } - - XFS_MOUNT_IUNLOCK(mp); - return 0; -} - -/* - * xfs_alloc_file_space() - * This routine allocates disk space for the given file. - * - * If alloc_type == 0, this request is for an ALLOCSP type - * request which will change the file size. In this case, no - * DMAPI event will be generated by the call. A TRUNCATE event - * will be generated later by xfs_setattr. - * - * If alloc_type != 0, this request is for a RESVSP type - * request, and a DMAPI DM_EVENT_WRITE will be generated if the - * lower block boundary byte address is less than the file's - * length. - * - * RETURNS: - * 0 on success - * errno on error - * - */ -STATIC int -xfs_alloc_file_space( - xfs_inode_t *ip, - xfs_off_t offset, - xfs_off_t len, - int alloc_type, - int attr_flags) -{ - xfs_mount_t *mp = ip->i_mount; - xfs_off_t count; - xfs_filblks_t allocated_fsb; - xfs_filblks_t allocatesize_fsb; - xfs_extlen_t extsz, temp; - xfs_fileoff_t startoffset_fsb; - xfs_fsblock_t firstfsb; - int nimaps; - int bmapi_flag; - int quota_flag; - int rt; - xfs_trans_t *tp; - xfs_bmbt_irec_t imaps[1], *imapp; - xfs_bmap_free_t free_list; - uint qblocks, resblks, resrtextents; - int committed; - int error; - - xfs_itrace_entry(ip); - - if (XFS_FORCED_SHUTDOWN(mp)) - return XFS_ERROR(EIO); - - if ((error = XFS_QM_DQATTACH(mp, ip, 0))) - return error; - - if (len <= 0) - return XFS_ERROR(EINVAL); - - rt = XFS_IS_REALTIME_INODE(ip); - extsz = xfs_get_extsz_hint(ip); - - count = len; - imapp = &imaps[0]; - nimaps = 1; - bmapi_flag = XFS_BMAPI_WRITE | (alloc_type ? XFS_BMAPI_PREALLOC : 0); - startoffset_fsb = XFS_B_TO_FSBT(mp, offset); - allocatesize_fsb = XFS_B_TO_FSB(mp, count); - - /* Generate a DMAPI event if needed. */ - if (alloc_type != 0 && offset < ip->i_size && - (attr_flags&ATTR_DMI) == 0 && - DM_EVENT_ENABLED(ip, DM_EVENT_WRITE)) { - xfs_off_t end_dmi_offset; - - end_dmi_offset = offset+len; - if (end_dmi_offset > ip->i_size) - end_dmi_offset = ip->i_size; - error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, XFS_ITOV(ip), - offset, end_dmi_offset - offset, - 0, NULL); - if (error) - return error; - } - - /* - * Allocate file space until done or until there is an error - */ -retry: - while (allocatesize_fsb && !error) { - xfs_fileoff_t s, e; - - /* - * Determine space reservations for data/realtime. - */ - if (unlikely(extsz)) { - s = startoffset_fsb; - do_div(s, extsz); - s *= extsz; - e = startoffset_fsb + allocatesize_fsb; - if ((temp = do_mod(startoffset_fsb, extsz))) - e += temp; - if ((temp = do_mod(e, extsz))) - e += extsz - temp; - } else { - s = 0; - e = allocatesize_fsb; - } - - if (unlikely(rt)) { - resrtextents = qblocks = (uint)(e - s); - resrtextents /= mp->m_sb.sb_rextsize; - resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); - quota_flag = XFS_QMOPT_RES_RTBLKS; - } else { - resrtextents = 0; - resblks = qblocks = \ - XFS_DIOSTRAT_SPACE_RES(mp, (uint)(e - s)); - quota_flag = XFS_QMOPT_RES_REGBLKS; - } - - /* - * Allocate and setup the transaction. - */ - tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); - error = xfs_trans_reserve(tp, resblks, - XFS_WRITE_LOG_RES(mp), resrtextents, - XFS_TRANS_PERM_LOG_RES, - XFS_WRITE_LOG_COUNT); - /* - * Check for running out of space - */ - if (error) { - /* - * Free the transaction structure. - */ - ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp)); - xfs_trans_cancel(tp, 0); - break; - } - xfs_ilock(ip, XFS_ILOCK_EXCL); - error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, - qblocks, 0, quota_flag); - if (error) - goto error1; - - xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); - xfs_trans_ihold(tp, ip); - - /* - * Issue the xfs_bmapi() call to allocate the blocks - */ - XFS_BMAP_INIT(&free_list, &firstfsb); - error = xfs_bmapi(tp, ip, startoffset_fsb, - allocatesize_fsb, bmapi_flag, - &firstfsb, 0, imapp, &nimaps, - &free_list, NULL); - if (error) { - goto error0; - } - - /* - * Complete the transaction - */ - error = xfs_bmap_finish(&tp, &free_list, &committed); - if (error) { - goto error0; - } - - error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); - xfs_iunlock(ip, XFS_ILOCK_EXCL); - if (error) { - break; - } - - allocated_fsb = imapp->br_blockcount; - - if (nimaps == 0) { - error = XFS_ERROR(ENOSPC); - break; - } - - startoffset_fsb += allocated_fsb; - allocatesize_fsb -= allocated_fsb; - } -dmapi_enospc_check: - if (error == ENOSPC && (attr_flags & ATTR_DMI) == 0 && - DM_EVENT_ENABLED(ip, DM_EVENT_NOSPACE)) { - error = XFS_SEND_NAMESP(mp, DM_EVENT_NOSPACE, - XFS_ITOV(ip), DM_RIGHT_NULL, - XFS_ITOV(ip), DM_RIGHT_NULL, - NULL, NULL, 0, 0, 0); /* Delay flag intentionally unused */ - if (error == 0) - goto retry; /* Maybe DMAPI app. has made space */ - /* else fall through with error from XFS_SEND_DATA */ - } - - return error; - -error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ - xfs_bmap_cancel(&free_list); - XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag); - -error1: /* Just cancel transaction */ - xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); - xfs_iunlock(ip, XFS_ILOCK_EXCL); - goto dmapi_enospc_check; -} - -/* - * Zero file bytes between startoff and endoff inclusive. - * The iolock is held exclusive and no blocks are buffered. - */ -STATIC int -xfs_zero_remaining_bytes( - xfs_inode_t *ip, - xfs_off_t startoff, - xfs_off_t endoff) -{ - xfs_bmbt_irec_t imap; - xfs_fileoff_t offset_fsb; - xfs_off_t lastoffset; - xfs_off_t offset; - xfs_buf_t *bp; - xfs_mount_t *mp = ip->i_mount; - int nimap; - int error = 0; - - bp = xfs_buf_get_noaddr(mp->m_sb.sb_blocksize, - XFS_IS_REALTIME_INODE(ip) ? - mp->m_rtdev_targp : mp->m_ddev_targp); - - for (offset = startoff; offset <= endoff; offset = lastoffset + 1) { - offset_fsb = XFS_B_TO_FSBT(mp, offset); - nimap = 1; - error = xfs_bmapi(NULL, ip, offset_fsb, 1, 0, - NULL, 0, &imap, &nimap, NULL, NULL); - if (error || nimap < 1) - break; - ASSERT(imap.br_blockcount >= 1); - ASSERT(imap.br_startoff == offset_fsb); - lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1; - if (lastoffset > endoff) - lastoffset = endoff; - if (imap.br_startblock == HOLESTARTBLOCK) - continue; - ASSERT(imap.br_startblock != DELAYSTARTBLOCK); - if (imap.br_state == XFS_EXT_UNWRITTEN) - continue; - XFS_BUF_UNDONE(bp); - XFS_BUF_UNWRITE(bp); - XFS_BUF_READ(bp); - XFS_BUF_SET_ADDR(bp, XFS_FSB_TO_DB(ip, imap.br_startblock)); - xfsbdstrat(mp, bp); - if ((error = xfs_iowait(bp))) { - xfs_ioerror_alert("xfs_zero_remaining_bytes(read)", - mp, bp, XFS_BUF_ADDR(bp)); - break; - } - memset(XFS_BUF_PTR(bp) + - (offset - XFS_FSB_TO_B(mp, imap.br_startoff)), - 0, lastoffset - offset + 1); - XFS_BUF_UNDONE(bp); - XFS_BUF_UNREAD(bp); - XFS_BUF_WRITE(bp); - xfsbdstrat(mp, bp); - if ((error = xfs_iowait(bp))) { - xfs_ioerror_alert("xfs_zero_remaining_bytes(write)", - mp, bp, XFS_BUF_ADDR(bp)); - break; - } - } - xfs_buf_free(bp); - return error; -} - -/* - * xfs_free_file_space() - * This routine frees disk space for the given file. - * - * This routine is only called by xfs_change_file_space - * for an UNRESVSP type call. - * - * RETURNS: - * 0 on success - * errno on error - * - */ -STATIC int -xfs_free_file_space( - xfs_inode_t *ip, - xfs_off_t offset, - xfs_off_t len, - int attr_flags) -{ - bhv_vnode_t *vp; - int committed; - int done; - xfs_off_t end_dmi_offset; - xfs_fileoff_t endoffset_fsb; - int error; - xfs_fsblock_t firstfsb; - xfs_bmap_free_t free_list; - xfs_bmbt_irec_t imap; - xfs_off_t ioffset; - xfs_extlen_t mod=0; - xfs_mount_t *mp; - int nimap; - uint resblks; - uint rounding; - int rt; - xfs_fileoff_t startoffset_fsb; - xfs_trans_t *tp; - int need_iolock = 1; - - vp = XFS_ITOV(ip); - mp = ip->i_mount; - - xfs_itrace_entry(ip); - - if ((error = XFS_QM_DQATTACH(mp, ip, 0))) - return error; - - error = 0; - if (len <= 0) /* if nothing being freed */ - return error; - rt = XFS_IS_REALTIME_INODE(ip); - startoffset_fsb = XFS_B_TO_FSB(mp, offset); - end_dmi_offset = offset + len; - endoffset_fsb = XFS_B_TO_FSBT(mp, end_dmi_offset); - - if (offset < ip->i_size && (attr_flags & ATTR_DMI) == 0 && - DM_EVENT_ENABLED(ip, DM_EVENT_WRITE)) { - if (end_dmi_offset > ip->i_size) - end_dmi_offset = ip->i_size; - error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, vp, - offset, end_dmi_offset - offset, - AT_DELAY_FLAG(attr_flags), NULL); - if (error) - return error; - } - - if (attr_flags & ATTR_NOLOCK) - need_iolock = 0; - if (need_iolock) { - xfs_ilock(ip, XFS_IOLOCK_EXCL); - vn_iowait(ip); /* wait for the completion of any pending DIOs */ - } - - rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE); - ioffset = offset & ~(rounding - 1); - - if (VN_CACHED(vp) != 0) { - xfs_inval_cached_trace(ip, ioffset, -1, ioffset, -1); - error = xfs_flushinval_pages(ip, ioffset, -1, FI_REMAPF_LOCKED); - if (error) - goto out_unlock_iolock; - } - - /* - * Need to zero the stuff we're not freeing, on disk. - * If its a realtime file & can't use unwritten extents then we - * actually need to zero the extent edges. Otherwise xfs_bunmapi - * will take care of it for us. - */ - if (rt && !XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) { - nimap = 1; - error = xfs_bmapi(NULL, ip, startoffset_fsb, - 1, 0, NULL, 0, &imap, &nimap, NULL, NULL); - if (error) - goto out_unlock_iolock; - ASSERT(nimap == 0 || nimap == 1); - if (nimap && imap.br_startblock != HOLESTARTBLOCK) { - xfs_daddr_t block; - - ASSERT(imap.br_startblock != DELAYSTARTBLOCK); - block = imap.br_startblock; - mod = do_div(block, mp->m_sb.sb_rextsize); - if (mod) - startoffset_fsb += mp->m_sb.sb_rextsize - mod; - } - nimap = 1; - error = xfs_bmapi(NULL, ip, endoffset_fsb - 1, - 1, 0, NULL, 0, &imap, &nimap, NULL, NULL); - if (error) - goto out_unlock_iolock; - ASSERT(nimap == 0 || nimap == 1); - if (nimap && imap.br_startblock != HOLESTARTBLOCK) { - ASSERT(imap.br_startblock != DELAYSTARTBLOCK); - mod++; - if (mod && (mod != mp->m_sb.sb_rextsize)) - endoffset_fsb -= mod; - } - } - if ((done = (endoffset_fsb <= startoffset_fsb))) - /* - * One contiguous piece to clear - */ - error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1); - else { - /* - * Some full blocks, possibly two pieces to clear - */ - if (offset < XFS_FSB_TO_B(mp, startoffset_fsb)) - error = xfs_zero_remaining_bytes(ip, offset, - XFS_FSB_TO_B(mp, startoffset_fsb) - 1); - if (!error && - XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len) - error = xfs_zero_remaining_bytes(ip, - XFS_FSB_TO_B(mp, endoffset_fsb), - offset + len - 1); - } - - /* - * free file space until done or until there is an error - */ - resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); - while (!error && !done) { - - /* - * allocate and setup the transaction. Allow this - * transaction to dip into the reserve blocks to ensure - * the freeing of the space succeeds at ENOSPC. - */ - tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); - tp->t_flags |= XFS_TRANS_RESERVE; - error = xfs_trans_reserve(tp, - resblks, - XFS_WRITE_LOG_RES(mp), - 0, - XFS_TRANS_PERM_LOG_RES, - XFS_WRITE_LOG_COUNT); - - /* - * check for running out of space - */ - if (error) { - /* - * Free the transaction structure. - */ - ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp)); - xfs_trans_cancel(tp, 0); - break; - } - xfs_ilock(ip, XFS_ILOCK_EXCL); - error = XFS_TRANS_RESERVE_QUOTA(mp, tp, - ip->i_udquot, ip->i_gdquot, resblks, 0, - XFS_QMOPT_RES_REGBLKS); - if (error) - goto error1; - - xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); - xfs_trans_ihold(tp, ip); - - /* - * issue the bunmapi() call to free the blocks - */ - XFS_BMAP_INIT(&free_list, &firstfsb); - error = xfs_bunmapi(tp, ip, startoffset_fsb, - endoffset_fsb - startoffset_fsb, - 0, 2, &firstfsb, &free_list, NULL, &done); - if (error) { - goto error0; - } - - /* - * complete the transaction - */ - error = xfs_bmap_finish(&tp, &free_list, &committed); - if (error) { - goto error0; - } - - error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); - xfs_iunlock(ip, XFS_ILOCK_EXCL); - } - - out_unlock_iolock: - if (need_iolock) - xfs_iunlock(ip, XFS_IOLOCK_EXCL); - return error; - - error0: - xfs_bmap_cancel(&free_list); - error1: - xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); - xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) : - XFS_ILOCK_EXCL); - return error; -} - -/* - * xfs_change_file_space() - * This routine allocates or frees disk space for the given file. - * The user specified parameters are checked for alignment and size - * limitations. - * - * RETURNS: - * 0 on success - * errno on error - * - */ -int -xfs_change_file_space( - xfs_inode_t *ip, - int cmd, - xfs_flock64_t *bf, - xfs_off_t offset, - cred_t *credp, - int attr_flags) -{ - xfs_mount_t *mp = ip->i_mount; - int clrprealloc; - int error; - xfs_fsize_t fsize; - int setprealloc; - xfs_off_t startoffset; - xfs_off_t llen; - xfs_trans_t *tp; - bhv_vattr_t va; - - xfs_itrace_entry(ip); - - if (!S_ISREG(ip->i_d.di_mode)) - return XFS_ERROR(EINVAL); - - switch (bf->l_whence) { - case 0: /*SEEK_SET*/ - break; - case 1: /*SEEK_CUR*/ - bf->l_start += offset; - break; - case 2: /*SEEK_END*/ - bf->l_start += ip->i_size; - break; - default: - return XFS_ERROR(EINVAL); - } - - llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len; - - if ( (bf->l_start < 0) - || (bf->l_start > XFS_MAXIOFFSET(mp)) - || (bf->l_start + llen < 0) - || (bf->l_start + llen > XFS_MAXIOFFSET(mp))) - return XFS_ERROR(EINVAL); - - bf->l_whence = 0; - - startoffset = bf->l_start; - fsize = ip->i_size; - - /* - * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve - * file space. - * These calls do NOT zero the data space allocated to the file, - * nor do they change the file size. - * - * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file - * space. - * These calls cause the new file data to be zeroed and the file - * size to be changed. - */ - setprealloc = clrprealloc = 0; - - switch (cmd) { - case XFS_IOC_RESVSP: - case XFS_IOC_RESVSP64: - error = xfs_alloc_file_space(ip, startoffset, bf->l_len, - 1, attr_flags); - if (error) - return error; - setprealloc = 1; - break; - - case XFS_IOC_UNRESVSP: - case XFS_IOC_UNRESVSP64: - if ((error = xfs_free_file_space(ip, startoffset, bf->l_len, - attr_flags))) - return error; - break; - - case XFS_IOC_ALLOCSP: - case XFS_IOC_ALLOCSP64: - case XFS_IOC_FREESP: - case XFS_IOC_FREESP64: - if (startoffset > fsize) { - error = xfs_alloc_file_space(ip, fsize, - startoffset - fsize, 0, attr_flags); - if (error) - break; - } - - va.va_mask = XFS_AT_SIZE; - va.va_size = startoffset; - - error = xfs_setattr(ip, &va, attr_flags, credp); - - if (error) - return error; - - clrprealloc = 1; - break; - - default: - ASSERT(0); - return XFS_ERROR(EINVAL); - } - - /* - * update the inode timestamp, mode, and prealloc flag bits - */ - tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID); - - if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp), - 0, 0, 0))) { - /* ASSERT(0); */ - xfs_trans_cancel(tp, 0); - return error; - } - - xfs_ilock(ip, XFS_ILOCK_EXCL); - - xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); - xfs_trans_ihold(tp, ip); - - if ((attr_flags & ATTR_DMI) == 0) { - ip->i_d.di_mode &= ~S_ISUID; - - /* - * Note that we don't have to worry about mandatory - * file locking being disabled here because we only - * clear the S_ISGID bit if the Group execute bit is - * on, but if it was on then mandatory locking wouldn't - * have been enabled. - */ - if (ip->i_d.di_mode & S_IXGRP) - ip->i_d.di_mode &= ~S_ISGID; - - xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); - } - if (setprealloc) - ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC; - else if (clrprealloc) - ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC; - - xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); - xfs_trans_set_sync(tp); - - error = xfs_trans_commit(tp, 0); - - xfs_iunlock(ip, XFS_ILOCK_EXCL); - - return error; -} |