diff options
Diffstat (limited to 'fs/xfs/xfs_vnodeops.c')
| -rw-r--r-- | fs/xfs/xfs_vnodeops.c | 2852 |
1 files changed, 0 insertions, 2852 deletions
diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c deleted file mode 100644 index 8e4a63c4151..00000000000 --- a/fs/xfs/xfs_vnodeops.c +++ /dev/null @@ -1,2852 +0,0 @@ -/* - * Copyright (c) 2000-2006 Silicon Graphics, Inc. - * All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it would be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include "xfs.h" -#include "xfs_fs.h" -#include "xfs_types.h" -#include "xfs_bit.h" -#include "xfs_log.h" -#include "xfs_inum.h" -#include "xfs_trans.h" -#include "xfs_sb.h" -#include "xfs_ag.h" -#include "xfs_dir2.h" -#include "xfs_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; - - trace_xfs_setattr(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, xfs_get_projid(ip), - 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) { - inode->i_mtime = inode->i_ctime = - current_fs_time(inode->i_sb); - xfs_mark_inode_dirty_sync(ip); - } - 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); - if (code) - goto error_return; - } - xfs_iunlock(ip, XFS_ILOCK_EXCL); - lock_flags &= ~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 (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); - if (code) - goto error_return; - } - - /* wait for all I/O to complete */ - xfs_ioend_wait(ip); - - code = -block_truncate_page(inode->i_mapping, iattr->ia_size, - xfs_get_blocks); - if (code) - goto error_return; - - tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE); - code = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, - XFS_ITRUNCATE_LOG_COUNT); - if (code) - goto error_return; - - truncate_setsize(inode, iattr->ia_size); - - commit_flags = XFS_TRANS_RELEASE_LOG_RES; - lock_flags |= XFS_ILOCK_EXCL; - - 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; - - trace_xfs_readlink(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)); - if (last_fsb <= end_fsb) - return 0; - map_len = last_fsb - end_fsb; - - 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; - - /* - * 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; - - trace_xfs_lookup(dp, name); - - 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) -{ - 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; - prid_t prid; - struct xfs_dquot *udqp = NULL; - struct xfs_dquot *gdqp = NULL; - uint resblks; - uint log_res; - uint log_count; - - trace_xfs_create(dp, name); - - if (XFS_FORCED_SHUTDOWN(mp)) - return XFS_ERROR(EIO); - - if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) - prid = xfs_get_projid(dp); - else - prid = XFS_PROJID_DEFAULT; - - /* - * 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, - 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_trans_ichgtime(tp, 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; - - trace_xfs_remove(dp, name); - - 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_trans_ichgtime(tp, 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; - - trace_xfs_link(tdp, target_name); - - 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) && - (xfs_get_projid(tdp) != xfs_get_projid(sip)))) { - 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_trans_ichgtime(tp, 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) -{ - 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; - prid_t prid; - struct xfs_dquot *udqp, *gdqp; - uint resblks; - - *ipp = NULL; - error = 0; - ip = NULL; - tp = NULL; - - trace_xfs_symlink(dp, link_name); - - 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 = xfs_get_projid(dp); - else - prid = XFS_PROJID_DEFAULT; - - /* - * 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, - 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_trans_ichgtime(tp, 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; - - trace_xfs_alloc_file_space(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; - 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; - } - - /* - * The transaction reservation is limited to a 32-bit block - * count, hence we need to limit the number of blocks we are - * trying to reserve to avoid an overflow. We can't allocate - * more than @nimaps extents, and an extent is limited on disk - * to MAXEXTLEN (21 bits), so use that to enforce the limit. - */ - resblks = min_t(xfs_fileoff_t, (e - s), (MAXEXTLEN * nimaps)); - if (unlikely(rt)) { - resrtextents = qblocks = resblks; - 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, resblks); - 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_uncached(XFS_IS_REALTIME_INODE(ip) ? - mp->m_rtdev_targp : mp->m_ddev_targp, - mp->m_sb.sb_blocksize, XBF_DONT_BLOCK); - 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_buf_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_buf_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; - - trace_xfs_free_file_space(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; - int prealloc_type; - - 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; - prealloc_type = XFS_BMAPI_PREALLOC; - - switch (cmd) { - case XFS_IOC_ZERO_RANGE: - prealloc_type |= XFS_BMAPI_CONVERT; - xfs_tosspages(ip, startoffset, startoffset + bf->l_len, 0); - /* FALLTHRU */ - case XFS_IOC_RESVSP: - case XFS_IOC_RESVSP64: - error = xfs_alloc_file_space(ip, startoffset, bf->l_len, - prealloc_type, 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_trans_ichgtime(tp, 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; -} |