| /* |
| * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it would be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "xfs.h" |
| #include "xfs_fs.h" |
| #include "xfs_types.h" |
| #include "xfs_bit.h" |
| #include "xfs_log.h" |
| #include "xfs_inum.h" |
| #include "xfs_trans.h" |
| #include "xfs_sb.h" |
| #include "xfs_ag.h" |
| #include "xfs_dir2.h" |
| #include "xfs_mount.h" |
| #include "xfs_da_btree.h" |
| #include "xfs_bmap_btree.h" |
| #include "xfs_ialloc_btree.h" |
| #include "xfs_dinode.h" |
| #include "xfs_inode.h" |
| #include "xfs_inode_item.h" |
| #include "xfs_itable.h" |
| #include "xfs_ialloc.h" |
| #include "xfs_alloc.h" |
| #include "xfs_bmap.h" |
| #include "xfs_acl.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_trans_space.h" |
| #include "xfs_log_priv.h" |
| #include "xfs_filestream.h" |
| #include "xfs_vnodeops.h" |
| #include "xfs_trace.h" |
| |
| int |
| xfs_setattr( |
| struct xfs_inode *ip, |
| struct iattr *iattr, |
| int flags) |
| { |
| xfs_mount_t *mp = ip->i_mount; |
| struct inode *inode = VFS_I(ip); |
| int mask = iattr->ia_valid; |
| xfs_trans_t *tp; |
| int code; |
| uint lock_flags; |
| uint commit_flags=0; |
| uid_t uid=0, iuid=0; |
| gid_t gid=0, igid=0; |
| struct xfs_dquot *udqp, *gdqp, *olddquot1, *olddquot2; |
| int need_iolock = 1; |
| |
| xfs_itrace_entry(ip); |
| |
| if (mp->m_flags & XFS_MOUNT_RDONLY) |
| return XFS_ERROR(EROFS); |
| |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return XFS_ERROR(EIO); |
| |
| code = -inode_change_ok(inode, iattr); |
| if (code) |
| return code; |
| |
| 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 & (ATTR_UID|ATTR_GID))) { |
| uint qflags = 0; |
| |
| if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) { |
| uid = iattr->ia_uid; |
| qflags |= XFS_QMOPT_UQUOTA; |
| } else { |
| uid = ip->i_d.di_uid; |
| } |
| if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) { |
| gid = iattr->ia_gid; |
| qflags |= XFS_QMOPT_GQUOTA; |
| } else { |
| gid = ip->i_d.di_gid; |
| } |
| |
| /* |
| * 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_vop_dqalloc(ip, uid, gid, ip->i_d.di_projid, |
| qflags, &udqp, &gdqp); |
| if (code) |
| return code; |
| } |
| |
| /* |
| * For the other attributes, we acquire the inode lock and |
| * first do an error checking pass. |
| */ |
| tp = NULL; |
| lock_flags = XFS_ILOCK_EXCL; |
| if (flags & XFS_ATTR_NOLOCK) |
| need_iolock = 0; |
| if (!(mask & ATTR_SIZE)) { |
| tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE); |
| commit_flags = 0; |
| code = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), |
| 0, 0, 0); |
| if (code) { |
| lock_flags = 0; |
| goto error_return; |
| } |
| } else { |
| if (need_iolock) |
| lock_flags |= XFS_IOLOCK_EXCL; |
| } |
| |
| xfs_ilock(ip, lock_flags); |
| |
| /* |
| * Change file ownership. Must be the owner or privileged. |
| */ |
| if (mask & (ATTR_UID|ATTR_GID)) { |
| /* |
| * 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; |
| igid = ip->i_d.di_gid; |
| gid = (mask & ATTR_GID) ? iattr->ia_gid : igid; |
| uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid; |
| |
| /* |
| * Do a quota reservation only if uid/gid is actually |
| * going to change. |
| */ |
| if (XFS_IS_QUOTA_RUNNING(mp) && |
| ((XFS_IS_UQUOTA_ON(mp) && iuid != uid) || |
| (XFS_IS_GQUOTA_ON(mp) && igid != gid))) { |
| ASSERT(tp); |
| code = xfs_qm_vop_chown_reserve(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 & ATTR_SIZE) { |
| /* Short circuit the truncate case for zero length files */ |
| if (iattr->ia_size == 0 && |
| ip->i_size == 0 && ip->i_d.di_nextents == 0) { |
| xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| lock_flags &= ~XFS_ILOCK_EXCL; |
| if (mask & ATTR_CTIME) |
| xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
| code = 0; |
| goto error_return; |
| } |
| |
| if (S_ISDIR(ip->i_d.di_mode)) { |
| code = XFS_ERROR(EISDIR); |
| goto error_return; |
| } else if (!S_ISREG(ip->i_d.di_mode)) { |
| code = XFS_ERROR(EINVAL); |
| goto error_return; |
| } |
| |
| /* |
| * Make sure that the dquots are attached to the inode. |
| */ |
| code = xfs_qm_dqattach_locked(ip, 0); |
| if (code) |
| goto error_return; |
| |
| /* |
| * Now we can make the changes. Before we join the inode |
| * to the transaction, if ATTR_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 (iattr->ia_size > ip->i_size) { |
| /* |
| * Do the first part of growing a file: zero any data |
| * in the last block that is beyond the old EOF. We |
| * need to do this before the inode is joined to the |
| * transaction to modify the i_size. |
| */ |
| code = xfs_zero_eof(ip, iattr->ia_size, ip->i_size); |
| } |
| xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| |
| /* |
| * We are going to log the inode size change in this |
| * transaction so any previous writes that are beyond the on |
| * disk EOF and the new EOF that have not been written out need |
| * to be written here. If we do not write the data out, we |
| * expose ourselves to the null files problem. |
| * |
| * Only flush from the on disk size to the smaller of the in |
| * memory file size or the new size as that's the range we |
| * really care about here and prevents waiting for other data |
| * not within the range we care about here. |
| */ |
| if (!code && |
| ip->i_size != ip->i_d.di_size && |
| iattr->ia_size > ip->i_d.di_size) { |
| code = xfs_flush_pages(ip, |
| ip->i_d.di_size, iattr->ia_size, |
| XBF_ASYNC, FI_NONE); |
| } |
| |
| /* wait for all I/O to complete */ |
| xfs_ioend_wait(ip); |
| |
| if (!code) |
| code = xfs_itruncate_data(ip, iattr->ia_size); |
| if (code) { |
| ASSERT(tp == NULL); |
| lock_flags &= ~XFS_ILOCK_EXCL; |
| ASSERT(lock_flags == XFS_IOLOCK_EXCL || !need_iolock); |
| 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); |
| |
| xfs_trans_ijoin(tp, ip); |
| |
| /* |
| * Only change the c/mtime if we are changing the size |
| * or we are explicitly asked to change it. This handles |
| * the semantic difference between truncate() and ftruncate() |
| * as implemented in the VFS. |
| * |
| * The regular truncate() case without ATTR_CTIME and ATTR_MTIME |
| * is a special case where we need to update the times despite |
| * not having these flags set. For all other operations the |
| * VFS set these flags explicitly if it wants a timestamp |
| * update. |
| */ |
| if (iattr->ia_size != ip->i_size && |
| (!(mask & (ATTR_CTIME | ATTR_MTIME)))) { |
| iattr->ia_ctime = iattr->ia_mtime = |
| current_fs_time(inode->i_sb); |
| mask |= ATTR_CTIME | ATTR_MTIME; |
| } |
| |
| if (iattr->ia_size > ip->i_size) { |
| ip->i_d.di_size = iattr->ia_size; |
| ip->i_size = iattr->ia_size; |
| xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
| } else if (iattr->ia_size <= ip->i_size || |
| (iattr->ia_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, iattr->ia_size, |
| XFS_DATA_FORK, |
| ((ip->i_d.di_nlink != 0 || |
| !(mp->m_flags & XFS_MOUNT_WSYNC)) |
| ? 1 : 0)); |
| if (code) |
| goto abort_return; |
| /* |
| * Truncated "down", so we're removing references |
| * to old data here - if we now delay flushing for |
| * a long time, we expose ourselves unduly to the |
| * notorious NULL files problem. So, we mark this |
| * vnode and flush it when the file is closed, and |
| * do not wait the usual (long) time for writeout. |
| */ |
| xfs_iflags_set(ip, XFS_ITRUNCATED); |
| } |
| } else if (tp) { |
| xfs_trans_ijoin(tp, ip); |
| } |
| |
| /* |
| * Change file ownership. Must be the owner or privileged. |
| */ |
| if (mask & (ATTR_UID|ATTR_GID)) { |
| /* |
| * 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_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) { |
| ASSERT(mask & ATTR_UID); |
| ASSERT(udqp); |
| olddquot1 = xfs_qm_vop_chown(tp, ip, |
| &ip->i_udquot, udqp); |
| } |
| ip->i_d.di_uid = uid; |
| inode->i_uid = uid; |
| } |
| if (igid != gid) { |
| if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) { |
| ASSERT(!XFS_IS_PQUOTA_ON(mp)); |
| ASSERT(mask & ATTR_GID); |
| ASSERT(gdqp); |
| olddquot2 = xfs_qm_vop_chown(tp, ip, |
| &ip->i_gdquot, gdqp); |
| } |
| ip->i_d.di_gid = gid; |
| inode->i_gid = gid; |
| } |
| } |
| |
| /* |
| * Change file access modes. |
| */ |
| if (mask & ATTR_MODE) { |
| umode_t mode = iattr->ia_mode; |
| |
| if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID)) |
| mode &= ~S_ISGID; |
| |
| ip->i_d.di_mode &= S_IFMT; |
| ip->i_d.di_mode |= mode & ~S_IFMT; |
| |
| inode->i_mode &= S_IFMT; |
| inode->i_mode |= mode & ~S_IFMT; |
| } |
| |
| /* |
| * Change file access or modified times. |
| */ |
| if (mask & ATTR_ATIME) { |
| inode->i_atime = iattr->ia_atime; |
| ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec; |
| ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec; |
| ip->i_update_core = 1; |
| } |
| if (mask & ATTR_CTIME) { |
| inode->i_ctime = iattr->ia_ctime; |
| ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec; |
| ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec; |
| ip->i_update_core = 1; |
| } |
| if (mask & ATTR_MTIME) { |
| inode->i_mtime = iattr->ia_mtime; |
| ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec; |
| ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec; |
| ip->i_update_core = 1; |
| } |
| |
| /* |
| * And finally, log the inode core if any attribute in it |
| * has been changed. |
| */ |
| if (mask & (ATTR_UID|ATTR_GID|ATTR_MODE| |
| ATTR_ATIME|ATTR_CTIME|ATTR_MTIME)) |
| xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
| |
| XFS_STATS_INC(xs_ig_attrchg); |
| |
| /* |
| * If this is a synchronous mount, make sure that the |
| * transaction goes to disk before returning to the user. |
| * This is slightly sub-optimal in that truncates require |
| * two sync transactions instead of one for wsync filesystems. |
| * One for the truncate and one for the timestamps since we |
| * don't want to change the timestamps unless we're sure the |
| * truncate worked. Truncates are less than 1% of the laddis |
| * mix so this probably isn't worth the trouble to optimize. |
| */ |
| code = 0; |
| if (mp->m_flags & XFS_MOUNT_WSYNC) |
| xfs_trans_set_sync(tp); |
| |
| code = xfs_trans_commit(tp, commit_flags); |
| |
| xfs_iunlock(ip, lock_flags); |
| |
| /* |
| * Release any dquot(s) the inode had kept before chown. |
| */ |
| xfs_qm_dqrele(olddquot1); |
| xfs_qm_dqrele(olddquot2); |
| xfs_qm_dqrele(udqp); |
| xfs_qm_dqrele(gdqp); |
| |
| if (code) |
| return code; |
| |
| /* |
| * XXX(hch): Updating the ACL entries is not atomic vs the i_mode |
| * update. We could avoid this with linked transactions |
| * and passing down the transaction pointer all the way |
| * to attr_set. No previous user of the generic |
| * Posix ACL code seems to care about this issue either. |
| */ |
| if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) { |
| code = -xfs_acl_chmod(inode); |
| if (code) |
| return XFS_ERROR(code); |
| } |
| |
| return 0; |
| |
| abort_return: |
| commit_flags |= XFS_TRANS_ABORT; |
| error_return: |
| xfs_qm_dqrele(udqp); |
| xfs_qm_dqrele(gdqp); |
| if (tp) { |
| xfs_trans_cancel(tp, commit_flags); |
| } |
| if (lock_flags != 0) { |
| xfs_iunlock(ip, lock_flags); |
| } |
| return code; |
| } |
| |
| /* |
| * The maximum pathlen is 1024 bytes. Since the minimum file system |
| * blocksize is 512 bytes, we can get a max of 2 extents back from |
| * bmapi. |
| */ |
| #define SYMLINK_MAPS 2 |
| |
| STATIC int |
| xfs_readlink_bmap( |
| xfs_inode_t *ip, |
| char *link) |
| { |
| xfs_mount_t *mp = ip->i_mount; |
| int pathlen = ip->i_d.di_size; |
| int nmaps = SYMLINK_MAPS; |
| xfs_bmbt_irec_t mval[SYMLINK_MAPS]; |
| xfs_daddr_t d; |
| int byte_cnt; |
| int n; |
| xfs_buf_t *bp; |
| int error = 0; |
| |
| error = xfs_bmapi(NULL, ip, 0, XFS_B_TO_FSB(mp, pathlen), 0, NULL, 0, |
| mval, &nmaps, NULL); |
| if (error) |
| goto out; |
| |
| for (n = 0; n < nmaps; n++) { |
| d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock); |
| byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount); |
| |
| bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), |
| XBF_LOCK | XBF_MAPPED | XBF_DONT_BLOCK); |
| error = XFS_BUF_GETERROR(bp); |
| if (error) { |
| xfs_ioerror_alert("xfs_readlink", |
| ip->i_mount, bp, XFS_BUF_ADDR(bp)); |
| xfs_buf_relse(bp); |
| goto out; |
| } |
| if (pathlen < byte_cnt) |
| byte_cnt = pathlen; |
| pathlen -= byte_cnt; |
| |
| memcpy(link, XFS_BUF_PTR(bp), byte_cnt); |
| xfs_buf_relse(bp); |
| } |
| |
| link[ip->i_d.di_size] = '\0'; |
| error = 0; |
| |
| out: |
| return error; |
| } |
| |
| int |
| xfs_readlink( |
| xfs_inode_t *ip, |
| char *link) |
| { |
| xfs_mount_t *mp = ip->i_mount; |
| int pathlen; |
| int error = 0; |
| |
| xfs_itrace_entry(ip); |
| |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return XFS_ERROR(EIO); |
| |
| xfs_ilock(ip, XFS_ILOCK_SHARED); |
| |
| ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFLNK); |
| ASSERT(ip->i_d.di_size <= MAXPATHLEN); |
| |
| pathlen = ip->i_d.di_size; |
| if (!pathlen) |
| goto out; |
| |
| if (ip->i_df.if_flags & XFS_IFINLINE) { |
| memcpy(link, ip->i_df.if_u1.if_data, pathlen); |
| link[pathlen] = '\0'; |
| } else { |
| error = xfs_readlink_bmap(ip, link); |
| } |
| |
| out: |
| xfs_iunlock(ip, XFS_ILOCK_SHARED); |
| return error; |
| } |
| |
| /* |
| * Flags for xfs_free_eofblocks |
| */ |
| #define XFS_FREE_EOF_TRYLOCK (1<<0) |
| |
| /* |
| * This is called by xfs_inactive to free any blocks beyond eof |
| * when the link count isn't zero and by xfs_dm_punch_hole() when |
| * punching a hole to EOF. |
| */ |
| STATIC int |
| xfs_free_eofblocks( |
| xfs_mount_t *mp, |
| xfs_inode_t *ip, |
| int flags) |
| { |
| xfs_trans_t *tp; |
| int error; |
| xfs_fileoff_t end_fsb; |
| xfs_fileoff_t last_fsb; |
| xfs_filblks_t map_len; |
| int nimaps; |
| xfs_bmbt_irec_t imap; |
| |
| /* |
| * Figure out if there are any blocks beyond the end |
| * of the file. If not, then there is nothing to do. |
| */ |
| end_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)ip->i_size)); |
| last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); |
| map_len = last_fsb - end_fsb; |
| if (map_len <= 0) |
| return 0; |
| |
| nimaps = 1; |
| xfs_ilock(ip, XFS_ILOCK_SHARED); |
| error = xfs_bmapi(NULL, ip, end_fsb, map_len, 0, |
| NULL, 0, &imap, &nimaps, NULL); |
| 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. |
| */ |
| error = xfs_qm_dqattach(ip, 0); |
| if (error) |
| return error; |
| |
| /* |
| * There are blocks after the end of file. |
| * Free them up now by truncating the file to |
| * its current size. |
| */ |
| tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); |
| |
| /* |
| * Do the xfs_itruncate_start() call before |
| * reserving any log space because |
| * itruncate_start will call into the buffer |
| * cache and we can't |
| * do that within a transaction. |
| */ |
| if (flags & XFS_FREE_EOF_TRYLOCK) { |
| if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) { |
| xfs_trans_cancel(tp, 0); |
| return 0; |
| } |
| } else { |
| xfs_ilock(ip, XFS_IOLOCK_EXCL); |
| } |
| error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, |
| ip->i_size); |
| if (error) { |
| xfs_trans_cancel(tp, 0); |
| xfs_iunlock(ip, XFS_IOLOCK_EXCL); |
| return error; |
| } |
| |
| error = xfs_trans_reserve(tp, 0, |
| XFS_ITRUNCATE_LOG_RES(mp), |
| 0, XFS_TRANS_PERM_LOG_RES, |
| XFS_ITRUNCATE_LOG_COUNT); |
| if (error) { |
| ASSERT(XFS_FORCED_SHUTDOWN(mp)); |
| xfs_trans_cancel(tp, 0); |
| xfs_iunlock(ip, XFS_IOLOCK_EXCL); |
| return error; |
| } |
| |
| xfs_ilock(ip, XFS_ILOCK_EXCL); |
| xfs_trans_ijoin(tp, ip); |
| |
| error = xfs_itruncate_finish(&tp, ip, |
| ip->i_size, |
| XFS_DATA_FORK, |
| 0); |
| /* |
| * If we get an error at this point we |
| * simply don't bother truncating the file. |
| */ |
| if (error) { |
| xfs_trans_cancel(tp, |
| (XFS_TRANS_RELEASE_LOG_RES | |
| XFS_TRANS_ABORT)); |
| } else { |
| error = xfs_trans_commit(tp, |
| XFS_TRANS_RELEASE_LOG_RES); |
| } |
| xfs_iunlock(ip, 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_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, &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_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
| /* |
| * Get a new, empty transaction to return to our caller. |
| */ |
| ntp = xfs_trans_dup(tp); |
| /* |
| * Commit the transaction containing extent freeing and EFDs. |
| * If we get an error on the commit here or on the reserve below, |
| * we need to unlock the inode since the new transaction doesn't |
| * have the inode attached. |
| */ |
| error = xfs_trans_commit(tp, 0); |
| tp = ntp; |
| if (error) { |
| ASSERT(XFS_FORCED_SHUTDOWN(mp)); |
| goto error0; |
| } |
| /* |
| * transaction commit worked ok so we can drop the extra ticket |
| * reference that we gained in xfs_trans_dup() |
| */ |
| xfs_log_ticket_put(tp->t_ticket); |
| |
| /* |
| * 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(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); |
| tp = *tpp; |
| mp = ip->i_mount; |
| ASSERT(ip->i_d.di_forkoff != 0); |
| error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
| xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| if (error) |
| goto error_unlock; |
| |
| error = xfs_attr_inactive(ip); |
| if (error) |
| goto error_unlock; |
| |
| 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) |
| goto error_cancel; |
| |
| xfs_ilock(ip, XFS_ILOCK_EXCL); |
| xfs_trans_ijoin(tp, ip); |
| xfs_idestroy_fork(ip, XFS_ATTR_FORK); |
| |
| ASSERT(ip->i_d.di_anextents == 0); |
| |
| *tpp = tp; |
| return 0; |
| |
| error_cancel: |
| ASSERT(XFS_FORCED_SHUTDOWN(mp)); |
| xfs_trans_cancel(tp, 0); |
| error_unlock: |
| *tpp = NULL; |
| xfs_iunlock(ip, XFS_IOLOCK_EXCL); |
| return error; |
| } |
| |
| int |
| xfs_release( |
| xfs_inode_t *ip) |
| { |
| xfs_mount_t *mp = ip->i_mount; |
| int error; |
| |
| if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0)) |
| return 0; |
| |
| /* If this is a read-only mount, don't do this (would generate I/O) */ |
| if (mp->m_flags & XFS_MOUNT_RDONLY) |
| return 0; |
| |
| if (!XFS_FORCED_SHUTDOWN(mp)) { |
| int truncated; |
| |
| /* |
| * If we are using filestreams, and we have an unlinked |
| * file that we are processing the last close on, then nothing |
| * will be able to reopen and write to this file. Purge this |
| * inode from the filestreams cache so that it doesn't delay |
| * teardown of the inode. |
| */ |
| if ((ip->i_d.di_nlink == 0) && xfs_inode_is_filestream(ip)) |
| xfs_filestream_deassociate(ip); |
| |
| /* |
| * If we previously truncated this file and removed old data |
| * in the process, we want to initiate "early" writeout on |
| * the last close. This is an attempt to combat the notorious |
| * NULL files problem which is particularly noticable from a |
| * truncate down, buffered (re-)write (delalloc), followed by |
| * a crash. What we are effectively doing here is |
| * significantly reducing the time window where we'd otherwise |
| * be exposed to that problem. |
| */ |
| truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED); |
| if (truncated && VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0) |
| xfs_flush_pages(ip, 0, -1, XBF_ASYNC, FI_NONE); |
| } |
| |
| if (ip->i_d.di_nlink != 0) { |
| if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) && |
| ((ip->i_size > 0) || (VN_CACHED(VFS_I(ip)) > 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 we can't get the iolock just skip truncating |
| * the blocks past EOF because we could deadlock |
| * with the mmap_sem otherwise. We'll get another |
| * chance to drop them once the last reference to |
| * the inode is dropped, so we'll never leak blocks |
| * permanently. |
| */ |
| error = xfs_free_eofblocks(mp, ip, |
| XFS_FREE_EOF_TRYLOCK); |
| if (error) |
| return error; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * xfs_inactive |
| * |
| * This is called when the vnode reference count for the vnode |
| * goes to zero. If the file has been unlinked, then it must |
| * now be truncated. Also, we clear all of the read-ahead state |
| * kept for the inode here since the file is now closed. |
| */ |
| int |
| xfs_inactive( |
| xfs_inode_t *ip) |
| { |
| xfs_bmap_free_t free_list; |
| xfs_fsblock_t first_block; |
| int committed; |
| xfs_trans_t *tp; |
| xfs_mount_t *mp; |
| int error; |
| int truncate; |
| |
| xfs_itrace_entry(ip); |
| |
| /* |
| * If the inode is already free, then there can be nothing |
| * to clean up here. |
| */ |
| if (ip->i_d.di_mode == 0 || is_bad_inode(VFS_I(ip))) { |
| ASSERT(ip->i_df.if_real_bytes == 0); |
| ASSERT(ip->i_df.if_broot_bytes == 0); |
| return VN_INACTIVE_CACHE; |
| } |
| |
| /* |
| * Only do a truncate if it's a regular file with |
| * some actual space in it. It's OK to look at the |
| * inode's fields without the lock because we're the |
| * only one with a reference to the inode. |
| */ |
| truncate = ((ip->i_d.di_nlink == 0) && |
| ((ip->i_d.di_size != 0) || (ip->i_size != 0) || |
| (ip->i_d.di_nextents > 0) || (ip->i_delayed_blks > 0)) && |
| ((ip->i_d.di_mode & S_IFMT) == S_IFREG)); |
| |
| mp = ip->i_mount; |
| |
| error = 0; |
| |
| /* If this is a read-only mount, don't do this (would generate I/O) */ |
| if (mp->m_flags & XFS_MOUNT_RDONLY) |
| goto out; |
| |
| if (ip->i_d.di_nlink != 0) { |
| if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) && |
| ((ip->i_size > 0) || (VN_CACHED(VFS_I(ip)) > 0 || |
| ip->i_delayed_blks > 0)) && |
| (ip->i_df.if_flags & XFS_IFEXTENTS) && |
| (!(ip->i_d.di_flags & |
| (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) || |
| (ip->i_delayed_blks != 0)))) { |
| error = xfs_free_eofblocks(mp, ip, 0); |
| if (error) |
| return VN_INACTIVE_CACHE; |
| } |
| goto out; |
| } |
| |
| ASSERT(ip->i_d.di_nlink == 0); |
| |
| error = xfs_qm_dqattach(ip, 0); |
| if (error) |
| return VN_INACTIVE_CACHE; |
| |
| tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); |
| if (truncate) { |
| /* |
| * Do the xfs_itruncate_start() call before |
| * reserving any log space because itruncate_start |
| * will call into the buffer cache and we can't |
| * do that within a transaction. |
| */ |
| xfs_ilock(ip, XFS_IOLOCK_EXCL); |
| |
| error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, 0); |
| if (error) { |
| xfs_trans_cancel(tp, 0); |
| xfs_iunlock(ip, XFS_IOLOCK_EXCL); |
| return VN_INACTIVE_CACHE; |
| } |
| |
| error = xfs_trans_reserve(tp, 0, |
| XFS_ITRUNCATE_LOG_RES(mp), |
| 0, XFS_TRANS_PERM_LOG_RES, |
| XFS_ITRUNCATE_LOG_COUNT); |
| if (error) { |
| /* Don't call itruncate_cleanup */ |
| ASSERT(XFS_FORCED_SHUTDOWN(mp)); |
| xfs_trans_cancel(tp, 0); |
| xfs_iunlock(ip, XFS_IOLOCK_EXCL); |
| return VN_INACTIVE_CACHE; |
| } |
| |
| xfs_ilock(ip, XFS_ILOCK_EXCL); |
| xfs_trans_ijoin(tp, ip); |
| |
| /* |
| * 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); |
| } 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); |
| } |
| |
| /* |
| * If there are attributes associated with the file |
| * then blow them away now. The code calls a routine |
| * that recursively deconstructs the attribute fork. |
| * We need to just commit the current transaction |
| * because we can't use it for xfs_attr_inactive(). |
| */ |
| if (ip->i_d.di_anextents > 0) { |
| error = xfs_inactive_attrs(ip, &tp); |
| /* |
| * If we got an error, the transaction is already |
| * cancelled, and the inode is unlocked. Just get out. |
| */ |
| if (error) |
| return VN_INACTIVE_CACHE; |
| } else if (ip->i_afp) { |
| xfs_idestroy_fork(ip, XFS_ATTR_FORK); |
| } |
| |
| /* |
| * Free the inode. |
| */ |
| xfs_bmap_init(&free_list, &first_block); |
| error = xfs_ifree(tp, ip, &free_list); |
| if (error) { |
| /* |
| * If we fail to free the inode, shut down. The cancel |
| * might do that, we need to make sure. Otherwise the |
| * inode might be lost for a long time or forever. |
| */ |
| if (!XFS_FORCED_SHUTDOWN(mp)) { |
| cmn_err(CE_NOTE, |
| "xfs_inactive: xfs_ifree() returned an error = %d on %s", |
| error, mp->m_fsname); |
| xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR); |
| } |
| xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT); |
| } else { |
| /* |
| * Credit the quota account(s). The inode is gone. |
| */ |
| xfs_trans_mod_dquot_byino(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. Make sure it's not a silent |
| * error. |
| */ |
| error = xfs_bmap_finish(&tp, &free_list, &committed); |
| if (error) |
| xfs_fs_cmn_err(CE_NOTE, mp, "xfs_inactive: " |
| "xfs_bmap_finish() returned error %d", error); |
| error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
| if (error) |
| xfs_fs_cmn_err(CE_NOTE, mp, "xfs_inactive: " |
| "xfs_trans_commit() returned error %d", error); |
| } |
| |
| /* |
| * Release the dquots held by inode, if any. |
| */ |
| xfs_qm_dqdetach(ip); |
| xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); |
| |
| out: |
| return VN_INACTIVE_CACHE; |
| } |
| |
| /* |
| * Lookups up an inode from "name". If ci_name is not NULL, then a CI match |
| * is allowed, otherwise it has to be an exact match. If a CI match is found, |
| * ci_name->name will point to a the actual name (caller must free) or |
| * will be set to NULL if an exact match is found. |
| */ |
| int |
| xfs_lookup( |
| xfs_inode_t *dp, |
| struct xfs_name *name, |
| xfs_inode_t **ipp, |
| struct xfs_name *ci_name) |
| { |
| xfs_ino_t inum; |
| int error; |
| uint lock_mode; |
| |
| xfs_itrace_entry(dp); |
| |
| if (XFS_FORCED_SHUTDOWN(dp->i_mount)) |
| return XFS_ERROR(EIO); |
| |
| lock_mode = xfs_ilock_map_shared(dp); |
| error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name); |
| xfs_iunlock_map_shared(dp, lock_mode); |
| |
| if (error) |
| goto out; |
| |
| error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp); |
| if (error) |
| goto out_free_name; |
| |
| return 0; |
| |
| out_free_name: |
| if (ci_name) |
| kmem_free(ci_name->name); |
| out: |
| *ipp = NULL; |
| return error; |
| } |
| |
| int |
| xfs_create( |
| xfs_inode_t *dp, |
| struct xfs_name *name, |
| mode_t mode, |
| xfs_dev_t rdev, |
| xfs_inode_t **ipp, |
| cred_t *credp) |
| { |
| int is_dir = S_ISDIR(mode); |
| struct xfs_mount *mp = dp->i_mount; |
| struct xfs_inode *ip = NULL; |
| struct xfs_trans *tp = NULL; |
| int error; |
| xfs_bmap_free_t free_list; |
| xfs_fsblock_t first_block; |
| boolean_t unlock_dp_on_error = B_FALSE; |
| uint cancel_flags; |
| int committed; |
| xfs_prid_t prid; |
| struct xfs_dquot *udqp = NULL; |
| struct xfs_dquot *gdqp = NULL; |
| uint resblks; |
| uint log_res; |
| uint log_count; |
| |
| xfs_itrace_entry(dp); |
| |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return XFS_ERROR(EIO); |
| |
| if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) |
| prid = dp->i_d.di_projid; |
| else |
| prid = dfltprid; |
| |
| /* |
| * Make sure that we have allocated dquot(s) on disk. |
| */ |
| error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid, |
| XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp); |
| if (error) |
| goto std_return; |
| |
| if (is_dir) { |
| rdev = 0; |
| resblks = XFS_MKDIR_SPACE_RES(mp, name->len); |
| log_res = XFS_MKDIR_LOG_RES(mp); |
| log_count = XFS_MKDIR_LOG_COUNT; |
| tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR); |
| } else { |
| resblks = XFS_CREATE_SPACE_RES(mp, name->len); |
| log_res = XFS_CREATE_LOG_RES(mp); |
| log_count = XFS_CREATE_LOG_COUNT; |
| tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE); |
| } |
| |
| cancel_flags = XFS_TRANS_RELEASE_LOG_RES; |
| |
| /* |
| * 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, log_res, 0, |
| XFS_TRANS_PERM_LOG_RES, log_count); |
| if (error == ENOSPC) { |
| /* flush outstanding delalloc blocks and retry */ |
| xfs_flush_inodes(dp); |
| error = xfs_trans_reserve(tp, resblks, log_res, 0, |
| XFS_TRANS_PERM_LOG_RES, log_count); |
| } |
| if (error == ENOSPC) { |
| /* No space at all so try a "no-allocation" reservation */ |
| resblks = 0; |
| error = xfs_trans_reserve(tp, 0, log_res, 0, |
| XFS_TRANS_PERM_LOG_RES, log_count); |
| } |
| if (error) { |
| cancel_flags = 0; |
| goto out_trans_cancel; |
| } |
| |
| xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT); |
| unlock_dp_on_error = B_TRUE; |
| |
| /* |
| * Check for directory link count overflow. |
| */ |
| if (is_dir && dp->i_d.di_nlink >= XFS_MAXLINK) { |
| error = XFS_ERROR(EMLINK); |
| goto out_trans_cancel; |
| } |
| |
| xfs_bmap_init(&free_list, &first_block); |
| |
| /* |
| * Reserve disk quota and the inode. |
| */ |
| error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0); |
| if (error) |
| goto out_trans_cancel; |
| |
| error = xfs_dir_canenter(tp, dp, name, resblks); |
| if (error) |
| goto out_trans_cancel; |
| |
| /* |
| * A newly created regular or special file just has one directory |
| * entry pointing to them, but a directory also the "." entry |
| * pointing to itself. |
| */ |
| error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev, credp, |
| prid, resblks > 0, &ip, &committed); |
| if (error) { |
| if (error == ENOSPC) |
| goto out_trans_cancel; |
| goto out_trans_abort; |
| } |
| |
| /* |
| * At this point, we've gotten a newly allocated inode. |
| * It is locked (and joined to the transaction). |
| */ |
| ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
| |
| /* |
| * Now we join the directory inode to the transaction. We do not do it |
| * earlier because xfs_dir_ialloc might commit the previous transaction |
| * (and release all the locks). An error from here on will result in |
| * the transaction cancel unlocking dp so don't do it explicitly in the |
| * error path. |
| */ |
| xfs_trans_ijoin_ref(tp, dp, XFS_ILOCK_EXCL); |
| unlock_dp_on_error = B_FALSE; |
| |
| error = xfs_dir_createname(tp, dp, name, ip->i_ino, |
| &first_block, &free_list, resblks ? |
| resblks - XFS_IALLOC_SPACE_RES(mp) : 0); |
| if (error) { |
| ASSERT(error != ENOSPC); |
| goto out_trans_abort; |
| } |
| xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
| xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); |
| |
| if (is_dir) { |
| error = xfs_dir_init(tp, ip, dp); |
| if (error) |
| goto out_bmap_cancel; |
| |
| error = xfs_bumplink(tp, dp); |
| if (error) |
| goto out_bmap_cancel; |
| } |
| |
| /* |
| * 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); |
| |
| /* |
| * 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_vop_create_dqattach(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); |
| |
| error = xfs_bmap_finish(&tp, &free_list, &committed); |
| if (error) |
| goto out_abort_rele; |
| |
| error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
| if (error) { |
| IRELE(ip); |
| goto out_dqrele; |
| } |
| |
| xfs_qm_dqrele(udqp); |
| xfs_qm_dqrele(gdqp); |
| |
| *ipp = ip; |
| return 0; |
| |
| out_bmap_cancel: |
| xfs_bmap_cancel(&free_list); |
| out_trans_abort: |
| cancel_flags |= XFS_TRANS_ABORT; |
| out_trans_cancel: |
| xfs_trans_cancel(tp, cancel_flags); |
| out_dqrele: |
| xfs_qm_dqrele(udqp); |
| xfs_qm_dqrele(gdqp); |
| |
| if (unlock_dp_on_error) |
| xfs_iunlock(dp, XFS_ILOCK_EXCL); |
| std_return: |
| return error; |
| |
| out_abort_rele: |
| /* |
| * Wait until after the current transaction is aborted to |
| * release the inode. This prevents recursive transactions |
| * and deadlocks from xfs_inactive. |
| */ |
| xfs_bmap_cancel(&free_list); |
| cancel_flags |= XFS_TRANS_ABORT; |
| xfs_trans_cancel(tp, cancel_flags); |
| IRELE(ip); |
| unlock_dp_on_error = B_FALSE; |
| goto out_dqrele; |
| } |
| |
| #ifdef DEBUG |
| int xfs_locked_n; |
| int xfs_small_retries; |
| int xfs_middle_retries; |
| int xfs_lots_retries; |
| int xfs_lock_delays; |
| #endif |
| |
| /* |
| * Bump the subclass so xfs_lock_inodes() acquires each lock with |
| * a different value |
| */ |
| static inline int |
| xfs_lock_inumorder(int lock_mode, int subclass) |
| { |
| if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) |
| lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT; |
| if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) |
| lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT; |
| |
| return lock_mode; |
| } |
| |
| /* |
| * The following routine will lock n inodes in exclusive mode. |
| * We assume the caller calls us with the inodes in i_ino order. |
| * |
| * We need to detect deadlock where an inode that we lock |
| * is in the AIL and we start waiting for another inode that is locked |
| * by a thread in a long running transaction (such as truncate). This can |
| * result in deadlock since the long running trans might need to wait |
| * for the inode we just locked in order to push the tail and free space |
| * in the log. |
| */ |
| void |
| xfs_lock_inodes( |
| xfs_inode_t **ips, |
| int inodes, |
| uint lock_mode) |
| { |
| int attempts = 0, i, j, try_lock; |
| xfs_log_item_t *lp; |
| |
| ASSERT(ips && (inodes >= 2)); /* we need at least two */ |
| |
| try_lock = 0; |
| i = 0; |
| |
| again: |
| for (; i < inodes; i++) { |
| ASSERT(ips[i]); |
| |
| if (i && (ips[i] == ips[i-1])) /* Already locked */ |
| continue; |
| |
| /* |
| * If try_lock is not set yet, make sure all locked inodes |
| * are not in the AIL. |
| * If any are, set try_lock to be used later. |
| */ |
| |
| if (!try_lock) { |
| for (j = (i - 1); j >= 0 && !try_lock; j--) { |
| lp = (xfs_log_item_t *)ips[j]->i_itemp; |
| if (lp && (lp->li_flags & XFS_LI_IN_AIL)) { |
| try_lock++; |
| } |
| } |
| } |
| |
| /* |
| * If any of the previous locks we have locked is in the AIL, |
| * we must TRY to get the second and subsequent locks. If |
| * we can't get any, we must release all we have |
| * and try again. |
| */ |
| |
| if (try_lock) { |
| /* try_lock must be 0 if i is 0. */ |
| /* |
| * try_lock means we have an inode locked |
| * that is in the AIL. |
| */ |
| ASSERT(i != 0); |
| if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) { |
| attempts++; |
| |
| /* |
| * Unlock all previous guys and try again. |
| * xfs_iunlock will try to push the tail |
| * if the inode is in the AIL. |
| */ |
| |
| for(j = i - 1; j >= 0; j--) { |
| |
| /* |
| * Check to see if we've already |
| * unlocked this one. |
| * Not the first one going back, |
| * and the inode ptr is the same. |
| */ |
| if ((j != (i - 1)) && ips[j] == |
| ips[j+1]) |
| continue; |
| |
| xfs_iunlock(ips[j], lock_mode); |
| } |
| |
| if ((attempts % 5) == 0) { |
| delay(1); /* Don't just spin the CPU */ |
| #ifdef DEBUG |
| xfs_lock_delays++; |
| #endif |
| } |
| i = 0; |
| try_lock = 0; |
| goto again; |
| } |
| } else { |
| xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i)); |
| } |
| } |
| |
| #ifdef DEBUG |
| if (attempts) { |
| if (attempts < 5) xfs_small_retries++; |
| else if (attempts < 100) xfs_middle_retries++; |
| else xfs_lots_retries++; |
| } else { |
| xfs_locked_n++; |
| } |
| #endif |
| } |
| |
| /* |
| * xfs_lock_two_inodes() can only be used to lock one type of lock |
| * at a time - the iolock or the ilock, but not both at once. If |
| * we lock both at once, lockdep will report false positives saying |
| * we have violated locking orders. |
| */ |
| void |
| xfs_lock_two_inodes( |
| xfs_inode_t *ip0, |
| xfs_inode_t *ip1, |
| uint lock_mode) |
| { |
| xfs_inode_t *temp; |
| int attempts = 0; |
| xfs_log_item_t *lp; |
| |
| if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) |
| ASSERT((lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) == 0); |
| ASSERT(ip0->i_ino != ip1->i_ino); |
| |
| if (ip0->i_ino > ip1->i_ino) { |
| temp = ip0; |
| ip0 = ip1; |
| ip1 = temp; |
| } |
| |
| again: |
| xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0)); |
| |
| /* |
| * If the first lock we have locked is in the AIL, we must TRY to get |
| * the second lock. If we can't get it, we must release the first one |
| * and try again. |
| */ |
| lp = (xfs_log_item_t *)ip0->i_itemp; |
| if (lp && (lp->li_flags & XFS_LI_IN_AIL)) { |
| if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) { |
| xfs_iunlock(ip0, lock_mode); |
| if ((++attempts % 5) == 0) |
| delay(1); /* Don't just spin the CPU */ |
| goto again; |
| } |
| } else { |
| xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1)); |
| } |
| } |
| |
| int |
| xfs_remove( |
| xfs_inode_t *dp, |
| struct xfs_name *name, |
| xfs_inode_t *ip) |
| { |
| xfs_mount_t *mp = dp->i_mount; |
| xfs_trans_t *tp = NULL; |
| int is_dir = S_ISDIR(ip->i_d.di_mode); |
| int error = 0; |
| xfs_bmap_free_t free_list; |
| xfs_fsblock_t first_block; |
| int cancel_flags; |
| int committed; |
| int link_zero; |
| uint resblks; |
| uint log_count; |
| |
| xfs_itrace_entry(dp); |
| xfs_itrace_entry(ip); |
| |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return XFS_ERROR(EIO); |
| |
| error = xfs_qm_dqattach(dp, 0); |
| if (error) |
| goto std_return; |
| |
| error = xfs_qm_dqattach(ip, 0); |
| if (error) |
| goto std_return; |
| |
| if (is_dir) { |
| tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR); |
| log_count = XFS_DEFAULT_LOG_COUNT; |
| } else { |
| tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE); |
| log_count = XFS_REMOVE_LOG_COUNT; |
| } |
| 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, log_count); |
| if (error == ENOSPC) { |
| resblks = 0; |
| error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0, |
| XFS_TRANS_PERM_LOG_RES, log_count); |
| } |
| if (error) { |
| ASSERT(error != ENOSPC); |
| cancel_flags = 0; |
| goto out_trans_cancel; |
| } |
| |
| xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL); |
| |
| xfs_trans_ijoin_ref(tp, dp, XFS_ILOCK_EXCL); |
| xfs_trans_ijoin_ref(tp, ip, XFS_ILOCK_EXCL); |
| |
| /* |
| * If we're removing a directory perform some additional validation. |
| */ |
| if (is_dir) { |
| ASSERT(ip->i_d.di_nlink >= 2); |
| if (ip->i_d.di_nlink != 2) { |
| error = XFS_ERROR(ENOTEMPTY); |
| goto out_trans_cancel; |
| } |
| if (!xfs_dir_isempty(ip)) { |
| error = XFS_ERROR(ENOTEMPTY); |
| goto out_trans_cancel; |
| } |
| } |
| |
| xfs_bmap_init(&free_list, &first_block); |
| error = xfs_dir_removename(tp, dp, name, ip->i_ino, |
| &first_block, &free_list, resblks); |
| if (error) { |
| ASSERT(error != ENOENT); |
| goto out_bmap_cancel; |
| } |
| xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
| |
| if (is_dir) { |
| /* |
| * Drop the link from ip's "..". |
| */ |
| error = xfs_droplink(tp, dp); |
| if (error) |
| goto out_bmap_cancel; |
| |
| /* |
| * Drop the "." link from ip to self. |
| */ |
| error = xfs_droplink(tp, ip); |
| if (error) |
| goto out_bmap_cancel; |
| } else { |
| /* |
| * When removing a non-directory we need to log the parent |
| * inode here. For a directory this is done implicitly |
| * by the xfs_droplink call for the ".." entry. |
| */ |
| xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); |
| } |
| |
| /* |
| * Drop the link from dp to ip. |
| */ |
| error = xfs_droplink(tp, ip); |
| if (error) |
| goto out_bmap_cancel; |
| |
| /* |
| * Determine if this is the last link while |
| * we are in the transaction. |
| */ |
| link_zero = (ip->i_d.di_nlink == 0); |
| |
| /* |
| * If this is a synchronous mount, make sure that the |
| * remove transaction goes to disk before returning to |
| * the user. |
| */ |
| if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) |
| xfs_trans_set_sync(tp); |
| |
| error = xfs_bmap_finish(&tp, &free_list, &committed); |
| if (error) |
| goto out_bmap_cancel; |
| |
| error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
| if (error) |
| goto std_return; |
| |
| /* |
| * If we are using filestreams, kill the stream association. |
| * If the file is still open it may get a new one but that |
| * will get killed on last close in xfs_close() so we don't |
| * have to worry about that. |
| */ |
| if (!is_dir && link_zero && xfs_inode_is_filestream(ip)) |
| xfs_filestream_deassociate(ip); |
| |
| return 0; |
| |
| out_bmap_cancel: |
| xfs_bmap_cancel(&free_list); |
| cancel_flags |= XFS_TRANS_ABORT; |
| out_trans_cancel: |
| xfs_trans_cancel(tp, cancel_flags); |
| std_return: |
| return error; |
| } |
| |
| int |
| xfs_link( |
| xfs_inode_t *tdp, |
| xfs_inode_t *sip, |
| struct xfs_name *target_name) |
| { |
| xfs_mount_t *mp = tdp->i_mount; |
| xfs_trans_t *tp; |
| int error; |
| xfs_bmap_free_t free_list; |
| xfs_fsblock_t first_block; |
| int cancel_flags; |
| int committed; |
| int resblks; |
| |
| xfs_itrace_entry(tdp); |
| xfs_itrace_entry(sip); |
| |
| ASSERT(!S_ISDIR(sip->i_d.di_mode)); |
| |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return XFS_ERROR(EIO); |
| |
| error = xfs_qm_dqattach(sip, 0); |
| if (error) |
| goto std_return; |
| |
| error = xfs_qm_dqattach(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_name->len); |
| 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; |
| } |
| |
| xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL); |
| |
| xfs_trans_ijoin_ref(tp, sip, XFS_ILOCK_EXCL); |
| xfs_trans_ijoin_ref(tp, tdp, XFS_ILOCK_EXCL); |
| |
| /* |
| * If the source has too many links, we can't make any more to it. |
| */ |
| if (sip->i_d.di_nlink >= XFS_MAXLINK) { |
| error = XFS_ERROR(EMLINK); |
| goto error_return; |
| } |
| |
| /* |
| * If we are using project inheritance, we only allow hard link |
| * creation in our tree when the project IDs are the same; else |
| * the tree quota mechanism could be circumvented. |
| */ |
| if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && |
| (tdp->i_d.di_projid != sip->i_d.di_projid))) { |
| error = XFS_ERROR(EXDEV); |
| goto error_return; |
| } |
| |
| error = xfs_dir_canenter(tp, tdp, target_name, resblks); |
| if (error) |
| goto error_return; |
| |
| xfs_bmap_init(&free_list, &first_block); |
| |
| error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino, |
| &first_block, &free_list, resblks); |
| if (error) |
| goto abort_return; |
| xfs_ichgtime(tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
| xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE); |
| |
| error = xfs_bumplink(tp, sip); |
| if (error) |
| goto abort_return; |
| |
| /* |
| * If this is a synchronous mount, make sure that the |
| * link transaction goes to disk before returning to |
| * the user. |
| */ |
| if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { |
| xfs_trans_set_sync(tp); |
| } |
| |
| error = xfs_bmap_finish (&tp, &free_list, &committed); |
| if (error) { |
| xfs_bmap_cancel(&free_list); |
| goto abort_return; |
| } |
| |
| return xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
| |
| abort_return: |
| cancel_flags |= XFS_TRANS_ABORT; |
| error_return: |
| xfs_trans_cancel(tp, cancel_flags); |
| std_return: |
| return error; |
| } |
| |
| int |
| xfs_symlink( |
| xfs_inode_t *dp, |
| struct xfs_name *link_name, |
| const char *target_path, |
| mode_t mode, |
| xfs_inode_t **ipp, |
| cred_t *credp) |
| { |
| xfs_mount_t *mp = dp->i_mount; |
| xfs_trans_t *tp; |
| xfs_inode_t *ip; |
| int error; |
| int pathlen; |
| xfs_bmap_free_t free_list; |
| xfs_fsblock_t first_block; |
| boolean_t unlock_dp_on_error = B_FALSE; |
| uint cancel_flags; |
| int committed; |
| xfs_fileoff_t first_fsb; |
| xfs_filblks_t fs_blocks; |
| int nmaps; |
| xfs_bmbt_irec_t mval[SYMLINK_MAPS]; |
| xfs_daddr_t d; |
| const char *cur_chunk; |
| int byte_cnt; |
| int n; |
| xfs_buf_t *bp; |
| xfs_prid_t prid; |
| struct xfs_dquot *udqp, *gdqp; |
| uint resblks; |
| |
| *ipp = NULL; |
| error = 0; |
| ip = NULL; |
| tp = NULL; |
| |
| xfs_itrace_entry(dp); |
| |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return XFS_ERROR(EIO); |
| |
| /* |
| * Check component lengths of the target path name. |
| */ |
| pathlen = strlen(target_path); |
| if (pathlen >= MAXPATHLEN) /* total string too long */ |
| return XFS_ERROR(ENAMETOOLONG); |
| |
| udqp = gdqp = NULL; |
| if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) |
| prid = dp->i_d.di_projid; |
| else |
| prid = (xfs_prid_t)dfltprid; |
| |
| /* |
| * Make sure that we have allocated dquot(s) on disk. |
| */ |
| error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), 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_name->len, fs_blocks); |
| error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0, |
| XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT); |
| if (error == ENOSPC && fs_blocks == 0) { |
| resblks = 0; |
| error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0, |
| XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT); |
| } |
| if (error) { |
| cancel_flags = 0; |
| goto error_return; |
| } |
| |
| xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT); |
| unlock_dp_on_error = B_TRUE; |
| |
| /* |
| * Check whether the directory allows new symlinks or not. |
| */ |
| if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) { |
| error = XFS_ERROR(EPERM); |
| goto error_return; |
| } |
| |
| /* |
| * Reserve disk quota : blocks and inode. |
| */ |
| error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0); |
| if (error) |
| goto error_return; |
| |
| /* |
| * Check for ability to enter directory entry, if no space reserved. |
| */ |
| error = xfs_dir_canenter(tp, dp, link_name, resblks); |
| if (error) |
| goto error_return; |
| /* |
| * Initialize the bmap freelist prior to calling either |
| * bmapi or the directory create code. |
| */ |
| xfs_bmap_init(&free_list, &first_block); |
| |
| /* |
| * Allocate an inode for the symlink. |
| */ |
| error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), |
| 1, 0, credp, prid, resblks > 0, &ip, NULL); |
| if (error) { |
| if (error == ENOSPC) |
| goto error_return; |
| goto error1; |
| } |
| |
| /* |
| * An error after we've joined dp to the transaction will result in the |
| * transaction cancel unlocking dp so don't do it explicitly in the |
| * error path. |
| */ |
| xfs_trans_ijoin_ref(tp, dp, XFS_ILOCK_EXCL); |
| unlock_dp_on_error = B_FALSE; |
| |
| /* |
| * Also attach the dquot(s) to it, if applicable. |
| */ |
| xfs_qm_vop_create_dqattach(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(tp, dp, link_name, 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); |
| |
| /* |
| * If this is a synchronous mount, make sure that the |
| * symlink transaction goes to disk before returning to |
| * the user. |
| */ |
| if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { |
| xfs_trans_set_sync(tp); |
| } |
| |
| /* |
| * xfs_trans_commit normally decrements the vnode ref count |
| * when it unlocks the inode. Since we want to return the |
| * vnode to the caller, we bump the vnode ref count now. |
| */ |
| IHOLD(ip); |
| |
| error = xfs_bmap_finish(&tp, &free_list, &committed); |
| if (error) { |
| goto error2; |
| } |
| error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
| xfs_qm_dqrele(udqp); |
| xfs_qm_dqrele(gdqp); |
| |
| *ipp = ip; |
| return 0; |
| |
| 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(udqp); |
| xfs_qm_dqrele(gdqp); |
| |
| if (unlock_dp_on_error) |
| xfs_iunlock(dp, XFS_ILOCK_EXCL); |
| std_return: |
| return error; |
| } |
| |
| int |
| xfs_set_dmattrs( |
| xfs_inode_t *ip, |
| u_int evmask, |
| u_int16_t state) |
| { |
| xfs_mount_t *mp = ip->i_mount; |
| xfs_trans_t *tp; |
| int error; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return XFS_ERROR(EPERM); |
| |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return XFS_ERROR(EIO); |
| |
| tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS); |
| error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0); |
| if (error) { |
| xfs_trans_cancel(tp, 0); |
| return error; |
| } |
| xfs_ilock(ip, XFS_ILOCK_EXCL); |
| xfs_trans_ijoin_ref(tp, ip, XFS_ILOCK_EXCL); |
| |
| ip->i_d.di_dmevmask = evmask; |
| ip->i_d.di_dmstate = state; |
| |
| xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
| error = xfs_trans_commit(tp, 0); |
| |
| return error; |
| } |
| |
| /* |
| * xfs_alloc_file_space() |
| * This routine allocates disk space for the given file. |
| * |
| * If alloc_type == 0, this request is for an ALLOCSP type |
| * request which will change the file size. In this case, no |
| * DMAPI event will be generated by the call. A TRUNCATE event |
| * will be generated later by xfs_setattr. |
| * |
| * If alloc_type != 0, this request is for a RESVSP type |
| * request, and a DMAPI DM_EVENT_WRITE will be generated if the |
| * lower block boundary byte address is less than the file's |
| * length. |
| * |
| * RETURNS: |
| * 0 on success |
| * errno on error |
| * |
| */ |
| STATIC int |
| xfs_alloc_file_space( |
| xfs_inode_t *ip, |
| xfs_off_t offset, |
| xfs_off_t len, |
| int alloc_type, |
| int attr_flags) |
| { |
| xfs_mount_t *mp = ip->i_mount; |
| xfs_off_t count; |
| xfs_filblks_t allocated_fsb; |
| xfs_filblks_t allocatesize_fsb; |
| xfs_extlen_t extsz, temp; |
| xfs_fileoff_t startoffset_fsb; |
| xfs_fsblock_t firstfsb; |
| int nimaps; |
| int bmapi_flag; |
| int quota_flag; |
| int rt; |
| xfs_trans_t *tp; |
| xfs_bmbt_irec_t imaps[1], *imapp; |
| xfs_bmap_free_t free_list; |
| uint qblocks, resblks, resrtextents; |
| int committed; |
| int error; |
| |
| xfs_itrace_entry(ip); |
| |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return XFS_ERROR(EIO); |
| |
| error = xfs_qm_dqattach(ip, 0); |
| if (error) |
| return error; |
| |
| if (len <= 0) |
| return XFS_ERROR(EINVAL); |
| |
| rt = XFS_IS_REALTIME_INODE(ip); |
| extsz = xfs_get_extsz_hint(ip); |
| |
| count = len; |
| imapp = &imaps[0]; |
| nimaps = 1; |
| bmapi_flag = XFS_BMAPI_WRITE | (alloc_type ? XFS_BMAPI_PREALLOC : 0); |
| startoffset_fsb = XFS_B_TO_FSBT(mp, offset); |
| allocatesize_fsb = XFS_B_TO_FSB(mp, count); |
| |
| /* |
| * Allocate file space until done or until there is an error |
| */ |
| 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(tp, ip, qblocks, |
| 0, quota_flag); |
| if (error) |
| goto error1; |
| |
| xfs_trans_ijoin(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, &committed); |
| if (error) { |
| goto error0; |
| } |
| |
| error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
| xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| if (error) { |
| break; |
| } |
| |
| allocated_fsb = imapp->br_blockcount; |
| |
| if (nimaps == 0) { |
| error = XFS_ERROR(ENOSPC); |
| break; |
| } |
| |
| startoffset_fsb += allocated_fsb; |
| allocatesize_fsb -= allocated_fsb; |
| } |
| |
| return error; |
| |
| error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ |
| xfs_bmap_cancel(&free_list); |
| xfs_trans_unreserve_quota_nblks(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); |
| return error; |
| } |
| |
| /* |
| * Zero file bytes between startoff and endoff inclusive. |
| * The iolock is held exclusive and no blocks are buffered. |
| * |
| * This function is used by xfs_free_file_space() to zero |
| * partial blocks when the range to free is not block aligned. |
| * When unreserving space with boundaries that are not block |
| * aligned we round up the start and round down the end |
| * boundaries and then use this function to zero the parts of |
| * the blocks that got dropped during the rounding. |
| */ |
| 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; |
| |
| /* |
| * Avoid doing I/O beyond eof - it's not necessary |
| * since nothing can read beyond eof. The space will |
| * be zeroed when the file is extended anyway. |
| */ |
| if (startoff >= ip->i_size) |
| return 0; |
| |
| if (endoff > ip->i_size) |
| endoff = ip->i_size; |
| |
| bp = xfs_buf_get_noaddr(mp->m_sb.sb_blocksize, |
| XFS_IS_REALTIME_INODE(ip) ? |
| mp->m_rtdev_targp : mp->m_ddev_targp); |
| if (!bp) |
| return XFS_ERROR(ENOMEM); |
| |
| 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); |
| error = xfs_iowait(bp); |
| if (error) { |
| 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); |
| error = xfs_iowait(bp); |
| if (error) { |
| 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) |
| { |
| int committed; |
| int done; |
| xfs_fileoff_t endoffset_fsb; |
| int error; |
| xfs_fsblock_t firstfsb; |
| xfs_bmap_free_t free_list; |
| xfs_bmbt_irec_t imap; |
| xfs_off_t ioffset; |
| xfs_extlen_t mod=0; |
| xfs_mount_t *mp; |
| int nimap; |
| uint resblks; |
| uint rounding; |
| int rt; |
| xfs_fileoff_t startoffset_fsb; |
| xfs_trans_t *tp; |
| int need_iolock = 1; |
| |
| mp = ip->i_mount; |
| |
| xfs_itrace_entry(ip); |
| |
| error = xfs_qm_dqattach(ip, 0); |
| if (error) |
| return error; |
| |
| error = 0; |
| if (len <= 0) /* if nothing being freed */ |
| return error; |
| rt = XFS_IS_REALTIME_INODE(ip); |
| startoffset_fsb = XFS_B_TO_FSB(mp, offset); |
| endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len); |
| |
| if (attr_flags & XFS_ATTR_NOLOCK) |
| need_iolock = 0; |
| if (need_iolock) { |
| xfs_ilock(ip, XFS_IOLOCK_EXCL); |
| /* wait for the completion of any pending DIOs */ |
| xfs_ioend_wait(ip); |
| } |
| |
| rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE); |
| ioffset = offset & ~(rounding - 1); |
| |
| if (VN_CACHED(VFS_I(ip)) != 0) { |
| error = xfs_flushinval_pages(ip, ioffset, -1, FI_REMAPF_LOCKED); |
| if (error) |
| goto out_unlock_iolock; |
| } |
| |
| /* |
| * Need to zero the stuff we're not freeing, on disk. |
| * If it's 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. Allow this |
| * transaction to dip into the reserve blocks to ensure |
| * the freeing of the space succeeds at ENOSPC. |
| */ |
| tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); |
| tp->t_flags |= XFS_TRANS_RESERVE; |
| error = xfs_trans_reserve(tp, |
| resblks, |
| XFS_WRITE_LOG_RES(mp), |
| 0, |
| XFS_TRANS_PERM_LOG_RES, |
| XFS_WRITE_LOG_COUNT); |
| |
| /* |
| * check for running out of space |
| */ |
| if (error) { |
| /* |
| * Free the transaction structure. |
| */ |
| ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp)); |
| xfs_trans_cancel(tp, 0); |
| break; |
| } |
| xfs_ilock(ip, XFS_ILOCK_EXCL); |
| error = xfs_trans_reserve_quota(tp, mp, |
| ip->i_udquot, ip->i_gdquot, |
| resblks, 0, XFS_QMOPT_RES_REGBLKS); |
| if (error) |
| goto error1; |
| |
| xfs_trans_ijoin(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, &committed); |
| if (error) { |
| goto error0; |
| } |
| |
| error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
| xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| } |
| |
| out_unlock_iolock: |
| if (need_iolock) |
| xfs_iunlock(ip, XFS_IOLOCK_EXCL); |
| return error; |
| |
| error0: |
| xfs_bmap_cancel(&free_list); |
| error1: |
| xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); |
| xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) : |
| XFS_ILOCK_EXCL); |
| return error; |
| } |
| |
| /* |
| * xfs_change_file_space() |
| * This routine allocates or frees disk space for the given file. |
| * The user specified parameters are checked for alignment and size |
| * limitations. |
| * |
| * RETURNS: |
| * 0 on success |
| * errno on error |
| * |
| */ |
| int |
| xfs_change_file_space( |
| xfs_inode_t *ip, |
| int cmd, |
| xfs_flock64_t *bf, |
| xfs_off_t offset, |
| int attr_flags) |
| { |
| xfs_mount_t *mp = ip->i_mount; |
| int clrprealloc; |
| int error; |
| xfs_fsize_t fsize; |
| int setprealloc; |
| xfs_off_t startoffset; |
| xfs_off_t llen; |
| xfs_trans_t *tp; |
| struct iattr iattr; |
| |
| xfs_itrace_entry(ip); |
| |
| if (!S_ISREG(ip->i_d.di_mode)) |
| return XFS_ERROR(EINVAL); |
| |
| switch (bf->l_whence) { |
| case 0: /*SEEK_SET*/ |
| break; |
| case 1: /*SEEK_CUR*/ |
| bf->l_start += offset; |
| break; |
| case 2: /*SEEK_END*/ |
| bf->l_start += ip->i_size; |
| break; |
| default: |
| return XFS_ERROR(EINVAL); |
| } |
| |
| llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len; |
| |
| if ( (bf->l_start < 0) |
| || (bf->l_start > XFS_MAXIOFFSET(mp)) |
| || (bf->l_start + llen < 0) |
| || (bf->l_start + llen > XFS_MAXIOFFSET(mp))) |
| return XFS_ERROR(EINVAL); |
| |
| bf->l_whence = 0; |
| |
| startoffset = bf->l_start; |
| fsize = ip->i_size; |
| |
| /* |
| * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve |
| * file space. |
| * These calls do NOT zero the data space allocated to the file, |
| * nor do they change the file size. |
| * |
| * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file |
| * space. |
| * These calls cause the new file data to be zeroed and the file |
| * size to be changed. |
| */ |
| setprealloc = clrprealloc = 0; |
| |
| switch (cmd) { |
| case XFS_IOC_RESVSP: |
| case XFS_IOC_RESVSP64: |
| error = xfs_alloc_file_space(ip, startoffset, bf->l_len, |
| 1, attr_flags); |
| if (error) |
| return error; |
| setprealloc = 1; |
| break; |
| |
| case XFS_IOC_UNRESVSP: |
| case XFS_IOC_UNRESVSP64: |
| if ((error = xfs_free_file_space(ip, startoffset, bf->l_len, |
| attr_flags))) |
| return error; |
| break; |
| |
| case XFS_IOC_ALLOCSP: |
| case XFS_IOC_ALLOCSP64: |
| case XFS_IOC_FREESP: |
| case XFS_IOC_FREESP64: |
| if (startoffset > fsize) { |
| error = xfs_alloc_file_space(ip, fsize, |
| startoffset - fsize, 0, attr_flags); |
| if (error) |
| break; |
| } |
| |
| iattr.ia_valid = ATTR_SIZE; |
| iattr.ia_size = startoffset; |
| |
| error = xfs_setattr(ip, &iattr, attr_flags); |
| |
| 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); |
| |
| if ((attr_flags & XFS_ATTR_DMI) == 0) { |
| ip->i_d.di_mode &= ~S_ISUID; |
| |
| /* |
| * Note that we don't have to worry about mandatory |
| * file locking being disabled here because we only |
| * clear the S_ISGID bit if the Group execute bit is |
| * on, but if it was on then mandatory locking wouldn't |
| * have been enabled. |
| */ |
| if (ip->i_d.di_mode & S_IXGRP) |
| ip->i_d.di_mode &= ~S_ISGID; |
| |
| xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
| } |
| if (setprealloc) |
| ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC; |
| else if (clrprealloc) |
| ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC; |
| |
| xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
| xfs_trans_set_sync(tp); |
| |
| error = xfs_trans_commit(tp, 0); |
| |
| xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| |
| return error; |
| } |