/* * Copyright (c) 2000-2005 Silicon Graphics, Inc. * All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include <linux/capability.h> #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_dir.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_dir_sf.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_dir_leaf.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_mac.h" /* * 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 /* * For xfs, we check that the file isn't too big to be opened by this kernel. * No other open action is required for regular files. Devices are handled * through the specfs file system, pipes through fifofs. Device and * fifo vnodes are "wrapped" by specfs and fifofs vnodes, respectively, * when a new vnode is first looked up or created. */ STATIC int xfs_open( bhv_desc_t *bdp, cred_t *credp) { int mode; vnode_t *vp; xfs_inode_t *ip; vp = BHV_TO_VNODE(bdp); ip = XFS_BHVTOI(bdp); 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 (VN_ISDIR(vp) && 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 */ STATIC int xfs_getattr( bhv_desc_t *bdp, vattr_t *vap, int flags, cred_t *credp) { xfs_inode_t *ip; xfs_mount_t *mp; vnode_t *vp; vp = BHV_TO_VNODE(bdp); vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); ip = XFS_BHVTOI(bdp); mp = ip->i_mount; if (XFS_FORCED_SHUTDOWN(mp)) return XFS_ERROR(EIO); if (!(flags & ATTR_LAZY)) xfs_ilock(ip, XFS_ILOCK_SHARED); vap->va_size = ip->i_d.di_size; 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 (!(ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) { 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 = ip->i_d.di_extsize ? (ip->i_d.di_extsize << mp->m_sb.sb_blocklog) : (mp->m_sb.sb_rextsize << 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( bhv_desc_t *bdp, vattr_t *vap, int flags, cred_t *credp) { xfs_inode_t *ip; xfs_trans_t *tp; xfs_mount_t *mp; 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; vnode_t *vp; 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; vp = BHV_TO_VNODE(bdp); vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); if (vp->v_vfsp->vfs_flag & VFS_RDONLY) return XFS_ERROR(EROFS); /* * Cannot set certain attributes. */ mask = vap->va_mask; if (mask & XFS_AT_NOSET) { return XFS_ERROR(EINVAL); } ip = XFS_BHVTOI(bdp); mp = ip->i_mount; 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; ASSERT(flags & ATTR_NOLOCK ? flags & ATTR_DMI : 1); 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 (vp->v_vfsp, 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_d.di_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) && (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) != (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 ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) || ((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_d.di_size) && (flags & ATTR_NOSIZETOK) == 0) { code = xfs_igrow_start(ip, vap->va_size, credp); } xfs_iunlock(ip, XFS_ILOCK_EXCL); vn_iowait(vp); /* wait for the completion of any pending DIOs */ 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_d.di_size) { xfs_igrow_finish(tp, ip, vap->va_size, !(flags & ATTR_DMI)); } else if ((vap->va_size <= ip->i_d.di_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; } } /* * 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 ((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; ip->i_iocore.io_flags |= XFS_IOCORE_RT; } else { ip->i_iocore.io_flags &= ~XFS_IOCORE_RT; } 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 filesytems. * 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, NULL); } /* * 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); if (mandlock_before != mandlock_after) { VOP_VNODE_CHANGE(vp, VCHANGE_FLAGS_ENF_LOCKING, mandlock_after); } 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(vp->v_vfsp, 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; } /* * xfs_access * Null conversion from vnode mode bits to inode mode bits, as in efs. */ STATIC int xfs_access( bhv_desc_t *bdp, int mode, cred_t *credp) { xfs_inode_t *ip; int error; vn_trace_entry(BHV_TO_VNODE(bdp), __FUNCTION__, (inst_t *)__return_address); ip = XFS_BHVTOI(bdp); xfs_ilock(ip, XFS_ILOCK_SHARED); error = xfs_iaccess(ip, mode, credp); xfs_iunlock(ip, XFS_ILOCK_SHARED); return error; } /* * xfs_readlink * */ STATIC int xfs_readlink( bhv_desc_t *bdp, uio_t *uiop, int ioflags, cred_t *credp) { xfs_inode_t *ip; int count; xfs_off_t offset; int pathlen; vnode_t *vp; int error = 0; xfs_mount_t *mp; int nmaps; xfs_bmbt_irec_t mval[SYMLINK_MAPS]; xfs_daddr_t d; int byte_cnt; int n; xfs_buf_t *bp; vp = BHV_TO_VNODE(bdp); vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); ip = XFS_BHVTOI(bdp); mp = ip->i_mount; 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); offset = uiop->uio_offset; count = uiop->uio_resid; if (offset < 0) { error = XFS_ERROR(EINVAL); goto error_return; } if (count <= 0) { error = 0; goto error_return; } /* * See if the symlink is stored inline. */ pathlen = (int)ip->i_d.di_size; if (ip->i_df.if_flags & XFS_IFINLINE) { error = uio_read(ip->i_df.if_u1.if_data, pathlen, uiop); } else { /* * Symlink not inline. Call bmap to get it in. */ nmaps = SYMLINK_MAPS; error = xfs_bmapi(NULL, ip, 0, XFS_B_TO_FSB(mp, pathlen), 0, NULL, 0, mval, &nmaps, NULL); if (error) { goto error_return; } 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 error_return; } if (pathlen < byte_cnt) byte_cnt = pathlen; pathlen -= byte_cnt; error = uio_read(XFS_BUF_PTR(bp), byte_cnt, uiop); xfs_buf_relse (bp); } } error_return: 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. */ STATIC int xfs_fsync( bhv_desc_t *bdp, int flag, cred_t *credp, xfs_off_t start, xfs_off_t stop) { xfs_inode_t *ip; xfs_trans_t *tp; int error; int log_flushed = 0, changed = 1; vn_trace_entry(BHV_TO_VNODE(bdp), __FUNCTION__, (inst_t *)__return_address); ip = XFS_BHVTOI(bdp); ASSERT(start >= 0 && stop >= -1); if (XFS_FORCED_SHUTDOWN(ip->i_mount)) return XFS_ERROR(EIO); /* * 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, NULL, &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 aswell. */ if (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) 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. */ STATIC int xfs_inactive_free_eofblocks( xfs_mount_t *mp, xfs_inode_t *ip) { 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; /* * 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_d.di_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); 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. */ xfs_ilock(ip, XFS_IOLOCK_EXCL); xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, ip->i_d.di_size); 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_d.di_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, NULL); } xfs_iunlock(ip, XFS_IOLOCK_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))) 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, &done))) goto error1; ASSERT(done); /* * Commit the first transaction. This logs the EFI and the inode. */ if ((error = xfs_bmap_finish(&tp, &free_list, first_block, &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 EFD's. * 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, NULL); 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, NULL); 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; } STATIC int xfs_release( bhv_desc_t *bdp) { xfs_inode_t *ip; vnode_t *vp; xfs_mount_t *mp; int error; vp = BHV_TO_VNODE(bdp); ip = XFS_BHVTOI(bdp); 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 (vp->v_vfsp->vfs_flag & VFS_RDONLY) return 0; #ifdef HAVE_REFCACHE /* If we are in the NFS reference cache then don't do this now */ if (ip->i_refcache) return 0; #endif mp = ip->i_mount; if (ip->i_d.di_nlink != 0) { if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) && ((ip->i_d.di_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)))) { if ((error = xfs_inactive_free_eofblocks(mp, ip))) return error; /* Update linux inode block count after free above */ vn_to_inode(vp)->i_blocks = XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks); } } 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. */ STATIC int xfs_inactive( bhv_desc_t *bdp, cred_t *credp) { xfs_inode_t *ip; vnode_t *vp; 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; vp = BHV_TO_VNODE(bdp); vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); ip = XFS_BHVTOI(bdp); /* * 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_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(vp->v_vfsp, 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 (vp->v_vfsp->vfs_flag & VFS_RDONLY) goto out; if (ip->i_d.di_nlink != 0) { if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) && ((ip->i_d.di_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)))) { if ((error = xfs_inactive_free_eofblocks(mp, ip))) return VN_INACTIVE_CACHE; /* Update linux inode block count after free above */ vn_to_inode(vp)->i_blocks = XFS_FSB_TO_BB(mp, ip->i_d.di_nblocks + ip->i_delayed_blks); } 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); xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, 0); 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, XFS_METADATA_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, first_block, &committed); (void) xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); } /* * 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; } /* * xfs_lookup */ STATIC int xfs_lookup( bhv_desc_t *dir_bdp, vname_t *dentry, vnode_t **vpp, int flags, vnode_t *rdir, cred_t *credp) { xfs_inode_t *dp, *ip; xfs_ino_t e_inum; int error; uint lock_mode; vnode_t *dir_vp; dir_vp = BHV_TO_VNODE(dir_bdp); vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); dp = XFS_BHVTOI(dir_bdp); if (XFS_FORCED_SHUTDOWN(dp->i_mount)) return XFS_ERROR(EIO); lock_mode = xfs_ilock_map_shared(dp); error = xfs_dir_lookup_int(dir_bdp, lock_mode, dentry, &e_inum, &ip); if (!error) { *vpp = XFS_ITOV(ip); ITRACE(ip); } xfs_iunlock_map_shared(dp, lock_mode); return error; } /* * xfs_create (create a new file). */ STATIC int xfs_create( bhv_desc_t *dir_bdp, vname_t *dentry, vattr_t *vap, vnode_t **vpp, cred_t *credp) { char *name = VNAME(dentry); vnode_t *dir_vp; xfs_inode_t *dp, *ip; vnode_t *vp=NULL; xfs_trans_t *tp; xfs_mount_t *mp; xfs_dev_t rdev; int error; xfs_bmap_free_t free_list; xfs_fsblock_t first_block; boolean_t dp_joined_to_trans; int dm_event_sent = 0; uint cancel_flags; int committed; xfs_prid_t prid; struct xfs_dquot *udqp, *gdqp; uint resblks; int dm_di_mode; int namelen; ASSERT(!*vpp); dir_vp = BHV_TO_VNODE(dir_bdp); vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); dp = XFS_BHVTOI(dir_bdp); mp = dp->i_mount; dm_di_mode = vap->va_mode; namelen = VNAMELEN(dentry); if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_CREATE)) { error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE, dir_vp, DM_RIGHT_NULL, NULL, DM_RIGHT_NULL, name, NULL, dm_di_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 if (vap->va_mask & XFS_AT_PROJID) prid = (xfs_prid_t)vap->va_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; dp_joined_to_trans = B_FALSE; 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; dp = NULL; goto error_return; } xfs_ilock(dp, XFS_ILOCK_EXCL); 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(mp, tp, dp, name, namelen))) goto error_return; rdev = (vap->va_mask & XFS_AT_RDEV) ? vap->va_rdev : 0; error = xfs_dir_ialloc(&tp, dp, vap->va_mode, 1, rdev, credp, prid, resblks > 0, &ip, &committed); if (error) { if (error == ENOSPC) goto error_return; goto abort_return; } ITRACE(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). */ VN_HOLD(dir_vp); xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); dp_joined_to_trans = B_TRUE; error = XFS_DIR_CREATENAME(mp, 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, first_block, &committed); if (error) { xfs_bmap_cancel(&free_list); goto abort_rele; } error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); if (error) { IRELE(ip); tp = NULL; goto error_return; } XFS_QM_DQRELE(mp, udqp); XFS_QM_DQRELE(mp, gdqp); /* * Propogate the fact that the vnode changed after the * xfs_inode locks have been released. */ VOP_VNODE_CHANGE(vp, VCHANGE_FLAGS_TRUNCATED, 3); *vpp = vp; /* Fallthrough to std_return with error = 0 */ std_return: if ( (*vpp || (error != 0 && dm_event_sent != 0)) && DM_EVENT_ENABLED(dir_vp->v_vfsp, XFS_BHVTOI(dir_bdp), DM_EVENT_POSTCREATE)) { (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTCREATE, dir_vp, DM_RIGHT_NULL, *vpp ? vp:NULL, DM_RIGHT_NULL, name, NULL, dm_di_mode, error, 0); } return error; abort_return: cancel_flags |= XFS_TRANS_ABORT; /* FALLTHROUGH */ error_return: if (tp != NULL) xfs_trans_cancel(tp, cancel_flags); if (!dp_joined_to_trans && (dp != NULL)) xfs_iunlock(dp, XFS_ILOCK_EXCL); XFS_QM_DQRELE(mp, udqp); XFS_QM_DQRELE(mp, gdqp); 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, vname_t *dentry, 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); e_inum = ip->i_ino; ITRACE(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 /* * 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], lock_mode)) { 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], lock_mode); } } #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 */ /* * xfs_remove * */ STATIC int xfs_remove( bhv_desc_t *dir_bdp, vname_t *dentry, cred_t *credp) { vnode_t *dir_vp; char *name = VNAME(dentry); xfs_inode_t *dp, *ip; xfs_trans_t *tp = NULL; xfs_mount_t *mp; 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; dir_vp = BHV_TO_VNODE(dir_bdp); vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); dp = XFS_BHVTOI(dir_bdp); mp = dp->i_mount; if (XFS_FORCED_SHUTDOWN(mp)) return XFS_ERROR(EIO); namelen = VNAMELEN(dentry); if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_REMOVE)) { error = XFS_SEND_NAMESP(mp, DM_EVENT_REMOVE, dir_vp, DM_RIGHT_NULL, NULL, DM_RIGHT_NULL, name, NULL, 0, 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 referece * 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; vn_trace_entry(XFS_ITOV(ip), __FUNCTION__, (inst_t *)__return_address); ITRACE(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, dentry, 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(mp, 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, first_block, &committed); if (error) { REMOVE_DEBUG_TRACE(__LINE__); goto error_rele; } error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); 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); vn_trace_exit(XFS_ITOV(ip), __FUNCTION__, (inst_t *)__return_address); /* * Let interposed file systems know about removed links. */ VOP_LINK_REMOVED(XFS_ITOV(ip), dir_vp, link_zero); IRELE(ip); /* Fall through to std_return with error = 0 */ std_return: if (DM_EVENT_ENABLED(dir_vp->v_vfsp, 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; } /* * xfs_link * */ STATIC int xfs_link( bhv_desc_t *target_dir_bdp, vnode_t *src_vp, vname_t *dentry, cred_t *credp) { xfs_inode_t *tdp, *sip; xfs_trans_t *tp; xfs_mount_t *mp; xfs_inode_t *ips[2]; int error; xfs_bmap_free_t free_list; xfs_fsblock_t first_block; int cancel_flags; int committed; vnode_t *target_dir_vp; int resblks; char *target_name = VNAME(dentry); int target_namelen; target_dir_vp = BHV_TO_VNODE(target_dir_bdp); vn_trace_entry(target_dir_vp, __FUNCTION__, (inst_t *)__return_address); vn_trace_entry(src_vp, __FUNCTION__, (inst_t *)__return_address); target_namelen = VNAMELEN(dentry); if (VN_ISDIR(src_vp)) return XFS_ERROR(EPERM); sip = xfs_vtoi(src_vp); tdp = XFS_BHVTOI(target_dir_bdp); mp = tdp->i_mount; if (XFS_FORCED_SHUTDOWN(mp)) return XFS_ERROR(EIO); if (DM_EVENT_ENABLED(src_vp->v_vfsp, 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(EPERM); goto error_return; } if (resblks == 0 && (error = XFS_DIR_CANENTER(mp, tp, tdp, target_name, target_namelen))) goto error_return; XFS_BMAP_INIT(&free_list, &first_block); error = XFS_DIR_CREATENAME(mp, 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, first_block, &committed); if (error) { xfs_bmap_cancel(&free_list); goto abort_return; } error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); if (error) { goto std_return; } /* Fall through to std_return with error = 0. */ std_return: if (DM_EVENT_ENABLED(src_vp->v_vfsp, 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; } /* * xfs_mkdir * */ STATIC int xfs_mkdir( bhv_desc_t *dir_bdp, vname_t *dentry, vattr_t *vap, vnode_t **vpp, cred_t *credp) { char *dir_name = VNAME(dentry); xfs_inode_t *dp; xfs_inode_t *cdp; /* inode of created dir */ vnode_t *cvp; /* vnode of created dir */ xfs_trans_t *tp; xfs_mount_t *mp; int cancel_flags; int error; int committed; xfs_bmap_free_t free_list; xfs_fsblock_t first_block; vnode_t *dir_vp; boolean_t dp_joined_to_trans; boolean_t created = B_FALSE; int dm_event_sent = 0; xfs_prid_t prid; struct xfs_dquot *udqp, *gdqp; uint resblks; int dm_di_mode; int dir_namelen; dir_vp = BHV_TO_VNODE(dir_bdp); dp = XFS_BHVTOI(dir_bdp); mp = dp->i_mount; if (XFS_FORCED_SHUTDOWN(mp)) return XFS_ERROR(EIO); dir_namelen = VNAMELEN(dentry); tp = NULL; dp_joined_to_trans = B_FALSE; dm_di_mode = vap->va_mode; if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_CREATE)) { error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE, dir_vp, DM_RIGHT_NULL, NULL, DM_RIGHT_NULL, dir_name, NULL, dm_di_mode, 0, 0); if (error) return error; dm_event_sent = 1; } /* Return through std_return after this point. */ vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); mp = dp->i_mount; udqp = gdqp = NULL; if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) prid = dp->i_d.di_projid; else if (vap->va_mask & XFS_AT_PROJID) prid = (xfs_prid_t)vap->va_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; dp = NULL; goto error_return; } xfs_ilock(dp, XFS_ILOCK_EXCL); /* * 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(mp, tp, dp, dir_name, dir_namelen))) goto error_return; /* * create the directory inode. */ error = xfs_dir_ialloc(&tp, dp, vap->va_mode, 2, 0, credp, prid, resblks > 0, &cdp, NULL); if (error) { if (error == ENOSPC) goto error_return; goto abort_return; } ITRACE(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. */ VN_HOLD(dir_vp); xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); dp_joined_to_trans = B_TRUE; XFS_BMAP_INIT(&free_list, &first_block); error = XFS_DIR_CREATENAME(mp, 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(mp, 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, first_block, &committed); if (error) { IRELE(cdp); goto error2; } error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); 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(dir_vp->v_vfsp, XFS_BHVTOI(dir_bdp), 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, dm_di_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 (!dp_joined_to_trans && (dp != NULL)) { xfs_iunlock(dp, XFS_ILOCK_EXCL); } goto std_return; } /* * xfs_rmdir * */ STATIC int xfs_rmdir( bhv_desc_t *dir_bdp, vname_t *dentry, cred_t *credp) { char *name = VNAME(dentry); xfs_inode_t *dp; xfs_inode_t *cdp; /* child directory */ xfs_trans_t *tp; xfs_mount_t *mp; int error; xfs_bmap_free_t free_list; xfs_fsblock_t first_block; int cancel_flags; int committed; vnode_t *dir_vp; int dm_di_mode = 0; int last_cdp_link; int namelen; uint resblks; dir_vp = BHV_TO_VNODE(dir_bdp); dp = XFS_BHVTOI(dir_bdp); mp = dp->i_mount; vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); if (XFS_FORCED_SHUTDOWN(XFS_BHVTOI(dir_bdp)->i_mount)) return XFS_ERROR(EIO); namelen = VNAMELEN(dentry); if (DM_EVENT_ENABLED(dir_vp->v_vfsp, dp, DM_EVENT_REMOVE)) { error = XFS_SEND_NAMESP(mp, DM_EVENT_REMOVE, dir_vp, DM_RIGHT_NULL, NULL, DM_RIGHT_NULL, name, NULL, 0, 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 referece * 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, dentry, 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); } ITRACE(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(mp, cdp)) { error = XFS_ERROR(ENOTEMPTY); goto error_return; } error = XFS_DIR_REMOVENAME(mp, 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, first_block, &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, NULL); if (error) { IRELE(cdp); goto std_return; } /* * Let interposed file systems know about removed links. */ VOP_LINK_REMOVED(XFS_ITOV(cdp), dir_vp, last_cdp_link); IRELE(cdp); /* Fall through to std_return with error = 0 or the errno * from xfs_trans_commit. */ std_return: if (DM_EVENT_ENABLED(dir_vp->v_vfsp, 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; } /* * xfs_readdir * * Read dp's entries starting at uiop->uio_offset and translate them into * bufsize bytes worth of struct dirents starting at bufbase. */ STATIC int xfs_readdir( bhv_desc_t *dir_bdp, uio_t *uiop, cred_t *credp, int *eofp) { xfs_inode_t *dp; xfs_trans_t *tp = NULL; int error = 0; uint lock_mode; vn_trace_entry(BHV_TO_VNODE(dir_bdp), __FUNCTION__, (inst_t *)__return_address); dp = XFS_BHVTOI(dir_bdp); if (XFS_FORCED_SHUTDOWN(dp->i_mount)) { return XFS_ERROR(EIO); } lock_mode = xfs_ilock_map_shared(dp); error = XFS_DIR_GETDENTS(dp->i_mount, tp, dp, uiop, eofp); xfs_iunlock_map_shared(dp, lock_mode); return error; } /* * xfs_symlink * */ STATIC int xfs_symlink( bhv_desc_t *dir_bdp, vname_t *dentry, vattr_t *vap, char *target_path, vnode_t **vpp, cred_t *credp) { xfs_trans_t *tp; xfs_mount_t *mp; xfs_inode_t *dp; xfs_inode_t *ip; int error; int pathlen; xfs_bmap_free_t free_list; xfs_fsblock_t first_block; boolean_t dp_joined_to_trans; vnode_t *dir_vp; 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; dir_vp = BHV_TO_VNODE(dir_bdp); dp = XFS_BHVTOI(dir_bdp); dp_joined_to_trans = B_FALSE; error = 0; ip = NULL; tp = NULL; vn_trace_entry(dir_vp, __FUNCTION__, (inst_t *)__return_address); mp = dp->i_mount; 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(dir_vp->v_vfsp, 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 if (vap->va_mask & XFS_AT_PROJID) prid = (xfs_prid_t)vap->va_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; dp = NULL; goto error_return; } xfs_ilock(dp, XFS_ILOCK_EXCL); /* * 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(mp, 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 | (vap->va_mode&~S_IFMT), 1, 0, credp, prid, resblks > 0, &ip, NULL); if (error) { if (error == ENOSPC) goto error_return; goto error1; } ITRACE(ip); VN_HOLD(dir_vp); xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); dp_joined_to_trans = B_TRUE; /* * 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); 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(mp, 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, first_block, &committed); if (error) { goto error2; } error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); 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(dir_vp->v_vfsp, XFS_BHVTOI(dir_bdp), 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) { 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 (!dp_joined_to_trans && (dp != NULL)) { xfs_iunlock(dp, XFS_ILOCK_EXCL); } goto std_return; } /* * xfs_fid2 * * A fid routine that takes a pointer to a previously allocated * fid structure (like xfs_fast_fid) but uses a 64 bit inode number. */ STATIC int xfs_fid2( bhv_desc_t *bdp, fid_t *fidp) { xfs_inode_t *ip; xfs_fid2_t *xfid; vn_trace_entry(BHV_TO_VNODE(bdp), __FUNCTION__, (inst_t *)__return_address); ASSERT(sizeof(fid_t) >= sizeof(xfs_fid2_t)); xfid = (xfs_fid2_t *)fidp; ip = XFS_BHVTOI(bdp); xfid->fid_len = sizeof(xfs_fid2_t) - sizeof(xfid->fid_len); xfid->fid_pad = 0; /* * use memcpy because the inode is a long long and there's no * assurance that xfid->fid_ino is properly aligned. */ memcpy(&xfid->fid_ino, &ip->i_ino, sizeof(xfid->fid_ino)); xfid->fid_gen = ip->i_d.di_gen; return 0; } /* * xfs_rwlock */ int xfs_rwlock( bhv_desc_t *bdp, vrwlock_t locktype) { xfs_inode_t *ip; vnode_t *vp; vp = BHV_TO_VNODE(bdp); if (VN_ISDIR(vp)) return 1; ip = XFS_BHVTOI(bdp); 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; } /* * xfs_rwunlock */ void xfs_rwunlock( bhv_desc_t *bdp, vrwlock_t locktype) { xfs_inode_t *ip; vnode_t *vp; vp = BHV_TO_VNODE(bdp); if (VN_ISDIR(vp)) return; ip = XFS_BHVTOI(bdp); 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; } STATIC int xfs_inode_flush( bhv_desc_t *bdp, int flags) { xfs_inode_t *ip; xfs_mount_t *mp; xfs_inode_log_item_t *iip; int error = 0; ip = XFS_BHVTOI(bdp); mp = ip->i_mount; iip = ip->i_itemp; 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 s, log_flags = XFS_LOG_FORCE; s = GRANT_LOCK(log); sync_lsn = log->l_last_sync_lsn; GRANT_UNLOCK(log, s); if ((XFS_LSN_CMP(iip->ili_last_lsn, sync_lsn) <= 0)) return 0; if (flags & FLUSH_SYNC) log_flags |= XFS_LOG_SYNC; return xfs_log_force(mp, iip->ili_last_lsn, log_flags); } } /* * 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 (xfs_ipincount(ip)) return EAGAIN; 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 ( bhv_desc_t *bdp, u_int evmask, u_int16_t state, cred_t *credp) { xfs_inode_t *ip; xfs_trans_t *tp; xfs_mount_t *mp; int error; if (!capable(CAP_SYS_ADMIN)) return XFS_ERROR(EPERM); ip = XFS_BHVTOI(bdp); mp = ip->i_mount; 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_iocore.io_dmevmask = ip->i_d.di_dmevmask = evmask; ip->i_iocore.io_dmstate = ip->i_d.di_dmstate = state; xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); IHOLD(ip); error = xfs_trans_commit(tp, 0, NULL); return error; } /* * xfs_reclaim */ STATIC int xfs_reclaim( bhv_desc_t *bdp) { xfs_inode_t *ip; vnode_t *vp; vp = BHV_TO_VNODE(bdp); ip = XFS_BHVTOI(bdp); vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); ASSERT(!VN_MAPPED(vp)); /* bad inode, get out here ASAP */ if (VN_BAD(vp)) { xfs_ireclaim(ip); return 0; } vn_iowait(vp); 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. */ 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 from us */ XFS_MOUNT_ILOCK(mp); vn_bhv_remove(VN_BHV_HEAD(vp), XFS_ITOBHV(ip)); list_add_tail(&ip->i_reclaim, &mp->m_del_inodes); ip->i_flags |= XFS_IRECLAIMABLE; XFS_MOUNT_IUNLOCK(mp); } return 0; } int xfs_finish_reclaim( xfs_inode_t *ip, int locked, int sync_mode) { xfs_ihash_t *ih = ip->i_hash; 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(&ih->ih_lock); if ((ip->i_flags & XFS_IRECLAIM) || (!(ip->i_flags & XFS_IRECLAIMABLE) && vp == NULL)) { write_unlock(&ih->ih_lock); if (locked) { xfs_ifunlock(ip); xfs_iunlock(ip, XFS_ILOCK_EXCL); } return 1; } ip->i_flags |= XFS_IRECLAIM; write_unlock(&ih->ih_lock); /* * 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; vn_trace_entry(XFS_ITOV(ip), __FUNCTION__, (inst_t *)__return_address); if (XFS_FORCED_SHUTDOWN(mp)) return XFS_ERROR(EIO); rt = XFS_IS_REALTIME_INODE(ip); if (unlikely(rt)) { if (!(extsz = ip->i_d.di_extsize)) extsz = mp->m_sb.sb_rextsize; } else { extsz = ip->i_d.di_extsize; } if ((error = XFS_QM_DQATTACH(mp, ip, 0))) return error; if (len <= 0) return XFS_ERROR(EINVAL); count = len; error = 0; 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_d.di_size && (attr_flags&ATTR_DMI) == 0 && DM_EVENT_ENABLED(XFS_MTOVFS(mp), ip, DM_EVENT_WRITE)) { xfs_off_t end_dmi_offset; end_dmi_offset = offset+len; if (end_dmi_offset > ip->i_d.di_size) end_dmi_offset = ip->i_d.di_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); if (error) { goto error0; } /* * Complete the transaction */ error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed); if (error) { goto error0; } error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); 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(XFS_MTOVFS(mp), 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, ip->i_d.di_flags & XFS_DIFLAG_REALTIME ? 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); 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) { 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_off_t ilen; xfs_bmbt_irec_t imap; xfs_off_t ioffset; xfs_extlen_t mod=0; xfs_mount_t *mp; int nimap; uint resblks; int rounding; int rt; xfs_fileoff_t startoffset_fsb; xfs_trans_t *tp; int need_iolock = 1; vp = XFS_ITOV(ip); mp = ip->i_mount; vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); if ((error = XFS_QM_DQATTACH(mp, ip, 0))) return error; error = 0; if (len <= 0) /* if nothing being freed */ return error; rt = (ip->i_d.di_flags & XFS_DIFLAG_REALTIME); 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_d.di_size && (attr_flags & ATTR_DMI) == 0 && DM_EVENT_ENABLED(XFS_MTOVFS(mp), ip, DM_EVENT_WRITE)) { if (end_dmi_offset > ip->i_d.di_size) end_dmi_offset = ip->i_d.di_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; } ASSERT(attr_flags & ATTR_NOLOCK ? attr_flags & ATTR_DMI : 1); if (attr_flags & ATTR_NOLOCK) need_iolock = 0; if (need_iolock) { xfs_ilock(ip, XFS_IOLOCK_EXCL); vn_iowait(vp); /* wait for the completion of any pending DIOs */ } rounding = MAX((__uint8_t)(1 << mp->m_sb.sb_blocklog), (__uint8_t)NBPP); ilen = len + (offset & (rounding - 1)); ioffset = offset & ~(rounding - 1); if (ilen & (rounding - 1)) ilen = (ilen + rounding) & ~(rounding - 1); if (VN_CACHED(vp) != 0) { xfs_inval_cached_trace(&ip->i_iocore, ioffset, -1, ctooff(offtoct(ioffset)), -1); VOP_FLUSHINVAL_PAGES(vp, ctooff(offtoct(ioffset)), -1, FI_REMAPF_LOCKED); } /* * 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); 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); 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 */ tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); 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, &done); if (error) { goto error0; } /* * complete the transaction */ error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed); if (error) { goto error0; } error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); 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( bhv_desc_t *bdp, int cmd, xfs_flock64_t *bf, xfs_off_t offset, cred_t *credp, int attr_flags) { int clrprealloc; int error; xfs_fsize_t fsize; xfs_inode_t *ip; xfs_mount_t *mp; int setprealloc; xfs_off_t startoffset; xfs_off_t llen; xfs_trans_t *tp; vattr_t va; vnode_t *vp; vp = BHV_TO_VNODE(bdp); vn_trace_entry(vp, __FUNCTION__, (inst_t *)__return_address); ip = XFS_BHVTOI(bdp); mp = ip->i_mount; /* * must be a regular file and have write permission */ if (!VN_ISREG(vp)) return XFS_ERROR(EINVAL); xfs_ilock(ip, XFS_ILOCK_SHARED); if ((error = xfs_iaccess(ip, S_IWUSR, credp))) { xfs_iunlock(ip, XFS_ILOCK_SHARED); return error; } xfs_iunlock(ip, XFS_ILOCK_SHARED); 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_d.di_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_d.di_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(bdp, &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, NULL); xfs_iunlock(ip, XFS_ILOCK_EXCL); return error; } vnodeops_t xfs_vnodeops = { BHV_IDENTITY_INIT(VN_BHV_XFS,VNODE_POSITION_XFS), .vop_open = xfs_open, .vop_read = xfs_read, #ifdef HAVE_SENDFILE .vop_sendfile = xfs_sendfile, #endif .vop_write = xfs_write, .vop_ioctl = xfs_ioctl, .vop_getattr = xfs_getattr, .vop_setattr = xfs_setattr, .vop_access = xfs_access, .vop_lookup = xfs_lookup, .vop_create = xfs_create, .vop_remove = xfs_remove, .vop_link = xfs_link, .vop_rename = xfs_rename, .vop_mkdir = xfs_mkdir, .vop_rmdir = xfs_rmdir, .vop_readdir = xfs_readdir, .vop_symlink = xfs_symlink, .vop_readlink = xfs_readlink, .vop_fsync = xfs_fsync, .vop_inactive = xfs_inactive, .vop_fid2 = xfs_fid2, .vop_rwlock = xfs_rwlock, .vop_rwunlock = xfs_rwunlock, .vop_bmap = xfs_bmap, .vop_reclaim = xfs_reclaim, .vop_attr_get = xfs_attr_get, .vop_attr_set = xfs_attr_set, .vop_attr_remove = xfs_attr_remove, .vop_attr_list = xfs_attr_list, .vop_link_removed = (vop_link_removed_t)fs_noval, .vop_vnode_change = (vop_vnode_change_t)fs_noval, .vop_tosspages = fs_tosspages, .vop_flushinval_pages = fs_flushinval_pages, .vop_flush_pages = fs_flush_pages, .vop_release = xfs_release, .vop_iflush = xfs_inode_flush, };