diff options
Diffstat (limited to 'sys/gnu/fs/xfs/xfs_rename.c')
-rw-r--r-- | sys/gnu/fs/xfs/xfs_rename.c | 636 |
1 files changed, 0 insertions, 636 deletions
diff --git a/sys/gnu/fs/xfs/xfs_rename.c b/sys/gnu/fs/xfs/xfs_rename.c deleted file mode 100644 index 995a4ec..0000000 --- a/sys/gnu/fs/xfs/xfs_rename.c +++ /dev/null @@ -1,636 +0,0 @@ -/* - * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. - * All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it would be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ -#include "xfs.h" -#include "xfs_fs.h" -#include "xfs_types.h" -#include "xfs_log.h" -#include "xfs_inum.h" -#include "xfs_trans.h" -#include "xfs_sb.h" -#include "xfs_dir.h" -#include "xfs_dir2.h" -#include "xfs_dmapi.h" -#include "xfs_mount.h" -#include "xfs_da_btree.h" -#include "xfs_bmap_btree.h" -#include "xfs_dir_sf.h" -#include "xfs_dir2_sf.h" -#include "xfs_attr_sf.h" -#include "xfs_dinode.h" -#include "xfs_inode.h" -#include "xfs_inode_item.h" -#include "xfs_bmap.h" -#include "xfs_error.h" -#include "xfs_quota.h" -#include "xfs_refcache.h" -#include "xfs_utils.h" -#include "xfs_trans_space.h" -#include "xfs_dir_leaf.h" - - -/* - * Given an array of up to 4 inode pointers, unlock the pointed to inodes. - * If there are fewer than 4 entries in the array, the empty entries will - * be at the end and will have NULL pointers in them. - */ -STATIC void -xfs_rename_unlock4( - xfs_inode_t **i_tab, - uint lock_mode) -{ - int i; - - xfs_iunlock(i_tab[0], lock_mode); - for (i = 1; i < 4; i++) { - if (i_tab[i] == NULL) { - break; - } - /* - * Watch out for duplicate entries in the table. - */ - if (i_tab[i] != i_tab[i-1]) { - xfs_iunlock(i_tab[i], lock_mode); - } - } -} - -#ifdef DEBUG -int xfs_rename_skip, xfs_rename_nskip; -#endif - -/* - * The following routine will acquire the locks required for a rename - * operation. The code understands the semantics of renames and will - * validate that name1 exists under dp1 & that name2 may or may not - * exist under dp2. - * - * We are renaming dp1/name1 to dp2/name2. - * - * Return ENOENT if dp1 does not exist, other lookup errors, or 0 for success. - */ -STATIC int -xfs_lock_for_rename( - xfs_inode_t *dp1, /* old (source) directory inode */ - xfs_inode_t *dp2, /* new (target) directory inode */ - vname_t *vname1,/* old entry name */ - vname_t *vname2,/* new entry name */ - xfs_inode_t **ipp1, /* inode of old entry */ - xfs_inode_t **ipp2, /* inode of new entry, if it - already exists, NULL otherwise. */ - xfs_inode_t **i_tab,/* array of inode returned, sorted */ - int *num_inodes) /* number of inodes in array */ -{ - xfs_inode_t *ip1, *ip2, *temp; - xfs_ino_t inum1, inum2; - int error; - int i, j; - uint lock_mode; - int diff_dirs = (dp1 != dp2); - - ip2 = NULL; - - /* - * First, find out the current inums of the entries so that we - * can determine the initial locking order. We'll have to - * sanity check stuff after all the locks have been acquired - * to see if we still have the right inodes, directories, etc. - */ - lock_mode = xfs_ilock_map_shared(dp1); - error = xfs_get_dir_entry(vname1, &ip1); - if (error) { - xfs_iunlock_map_shared(dp1, lock_mode); - return error; - } - - inum1 = ip1->i_ino; - - ASSERT(ip1); - ITRACE(ip1); - - /* - * Unlock dp1 and lock dp2 if they are different. - */ - - if (diff_dirs) { - xfs_iunlock_map_shared(dp1, lock_mode); - lock_mode = xfs_ilock_map_shared(dp2); - } - - error = xfs_dir_lookup_int(XFS_ITOBHV(dp2), lock_mode, - vname2, &inum2, &ip2); - if (error == ENOENT) { /* target does not need to exist. */ - inum2 = 0; - } else if (error) { - /* - * If dp2 and dp1 are the same, the next line unlocks dp1. - * Got it? - */ - xfs_iunlock_map_shared(dp2, lock_mode); - IRELE (ip1); - return error; - } else { - ITRACE(ip2); - } - - /* - * i_tab contains a list of pointers to inodes. We initialize - * the table here & we'll sort it. We will then use it to - * order the acquisition of the inode locks. - * - * Note that the table may contain duplicates. e.g., dp1 == dp2. - */ - i_tab[0] = dp1; - i_tab[1] = dp2; - i_tab[2] = ip1; - if (inum2 == 0) { - *num_inodes = 3; - i_tab[3] = NULL; - } else { - *num_inodes = 4; - i_tab[3] = ip2; - } - - /* - * Sort the elements via bubble sort. (Remember, there are at - * most 4 elements to sort, so this is adequate.) - */ - for (i=0; i < *num_inodes; i++) { - for (j=1; j < *num_inodes; j++) { - if (i_tab[j]->i_ino < i_tab[j-1]->i_ino) { - temp = i_tab[j]; - i_tab[j] = i_tab[j-1]; - i_tab[j-1] = temp; - } - } - } - - /* - * We have dp2 locked. If it isn't first, unlock it. - * If it is first, tell xfs_lock_inodes so it can skip it - * when locking. if dp1 == dp2, xfs_lock_inodes will skip both - * since they are equal. xfs_lock_inodes needs all these inodes - * so that it can unlock and retry if there might be a dead-lock - * potential with the log. - */ - - if (i_tab[0] == dp2 && lock_mode == XFS_ILOCK_SHARED) { -#ifdef DEBUG - xfs_rename_skip++; -#endif - xfs_lock_inodes(i_tab, *num_inodes, 1, XFS_ILOCK_SHARED); - } else { -#ifdef DEBUG - xfs_rename_nskip++; -#endif - xfs_iunlock_map_shared(dp2, lock_mode); - xfs_lock_inodes(i_tab, *num_inodes, 0, XFS_ILOCK_SHARED); - } - - /* - * Set the return value. Null out any unused entries in i_tab. - */ - *ipp1 = *ipp2 = NULL; - for (i=0; i < *num_inodes; i++) { - if (i_tab[i]->i_ino == inum1) { - *ipp1 = i_tab[i]; - } - if (i_tab[i]->i_ino == inum2) { - *ipp2 = i_tab[i]; - } - } - for (;i < 4; i++) { - i_tab[i] = NULL; - } - return 0; -} - -/* - * xfs_rename - */ -int -xfs_rename( - bhv_desc_t *src_dir_bdp, - vname_t *src_vname, - xfs_vnode_t *target_dir_vp, - vname_t *target_vname, - cred_t *credp) -{ - xfs_trans_t *tp; - xfs_inode_t *src_dp, *target_dp, *src_ip, *target_ip; - xfs_mount_t *mp; - int new_parent; /* moving to a new dir */ - int src_is_directory; /* src_name is a directory */ - int error; - xfs_bmap_free_t free_list; - xfs_fsblock_t first_block; - int cancel_flags; - int committed; - xfs_inode_t *inodes[4]; - int target_ip_dropped = 0; /* dropped target_ip link? */ - xfs_vnode_t *src_dir_vp; - int spaceres; - int target_link_zero = 0; - int num_inodes; - char *src_name = VNAME(src_vname); - char *target_name = VNAME(target_vname); - int src_namelen = VNAMELEN(src_vname); - int target_namelen = VNAMELEN(target_vname); - - src_dir_vp = BHV_TO_VNODE(src_dir_bdp); - vn_trace_entry(src_dir_vp, "xfs_rename", (inst_t *)__return_address); - vn_trace_entry(target_dir_vp, "xfs_rename", (inst_t *)__return_address); - - /* - * Find the XFS behavior descriptor for the target directory - * vnode since it was not handed to us. - */ - target_dp = xfs_vtoi(target_dir_vp); - if (target_dp == NULL) { - return XFS_ERROR(EXDEV); - } - - src_dp = XFS_BHVTOI(src_dir_bdp); - mp = src_dp->i_mount; - - if (DM_EVENT_ENABLED(src_dir_vp->v_vfsp, src_dp, DM_EVENT_RENAME) || - DM_EVENT_ENABLED(target_dir_vp->v_vfsp, - target_dp, DM_EVENT_RENAME)) { - error = XFS_SEND_NAMESP(mp, DM_EVENT_RENAME, - src_dir_vp, DM_RIGHT_NULL, - target_dir_vp, DM_RIGHT_NULL, - src_name, target_name, - 0, 0, 0); - if (error) { - return error; - } - } - /* Return through std_return after this point. */ - - /* - * Lock all the participating inodes. Depending upon whether - * the target_name exists in the target directory, and - * whether the target directory is the same as the source - * directory, we can lock from 2 to 4 inodes. - * xfs_lock_for_rename() will return ENOENT if src_name - * does not exist in the source directory. - */ - tp = NULL; - error = xfs_lock_for_rename(src_dp, target_dp, src_vname, - target_vname, &src_ip, &target_ip, inodes, - &num_inodes); - - if (error) { - /* - * We have nothing locked, no inode references, and - * no transaction, so just get out. - */ - goto std_return; - } - - ASSERT(src_ip != NULL); - - if ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR) { - /* - * Check for link count overflow on target_dp - */ - if (target_ip == NULL && (src_dp != target_dp) && - target_dp->i_d.di_nlink >= XFS_MAXLINK) { - error = XFS_ERROR(EMLINK); - xfs_rename_unlock4(inodes, XFS_ILOCK_SHARED); - goto rele_return; - } - } - - new_parent = (src_dp != target_dp); - src_is_directory = ((src_ip->i_d.di_mode & S_IFMT) == S_IFDIR); - - /* - * Drop the locks on our inodes so that we can start the transaction. - */ - xfs_rename_unlock4(inodes, XFS_ILOCK_SHARED); - - XFS_BMAP_INIT(&free_list, &first_block); - tp = xfs_trans_alloc(mp, XFS_TRANS_RENAME); - cancel_flags = XFS_TRANS_RELEASE_LOG_RES; - spaceres = XFS_RENAME_SPACE_RES(mp, target_namelen); - error = xfs_trans_reserve(tp, spaceres, XFS_RENAME_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT); - if (error == ENOSPC) { - spaceres = 0; - error = xfs_trans_reserve(tp, 0, XFS_RENAME_LOG_RES(mp), 0, - XFS_TRANS_PERM_LOG_RES, XFS_RENAME_LOG_COUNT); - } - if (error) { - xfs_trans_cancel(tp, 0); - goto rele_return; - } - - /* - * Attach the dquots to the inodes - */ - if ((error = XFS_QM_DQVOPRENAME(mp, inodes))) { - xfs_trans_cancel(tp, cancel_flags); - goto rele_return; - } - - /* - * Reacquire the inode locks we dropped above. - */ - xfs_lock_inodes(inodes, num_inodes, 0, XFS_ILOCK_EXCL); - - /* - * Join all the inodes to the transaction. From this point on, - * we can rely on either trans_commit or trans_cancel to unlock - * them. Note that we need to add a vnode reference to the - * directories since trans_commit & trans_cancel will decrement - * them when they unlock the inodes. Also, we need to be careful - * not to add an inode to the transaction more than once. - */ - VN_HOLD(src_dir_vp); - xfs_trans_ijoin(tp, src_dp, XFS_ILOCK_EXCL); - if (new_parent) { - VN_HOLD(target_dir_vp); - xfs_trans_ijoin(tp, target_dp, XFS_ILOCK_EXCL); - } - if ((src_ip != src_dp) && (src_ip != target_dp)) { - xfs_trans_ijoin(tp, src_ip, XFS_ILOCK_EXCL); - } - if ((target_ip != NULL) && - (target_ip != src_ip) && - (target_ip != src_dp) && - (target_ip != target_dp)) { - xfs_trans_ijoin(tp, target_ip, XFS_ILOCK_EXCL); - } - - /* - * Set up the target. - */ - if (target_ip == NULL) { - /* - * If there's no space reservation, check the entry will - * fit before actually inserting it. - */ - if (spaceres == 0 && - (error = XFS_DIR_CANENTER(mp, tp, target_dp, target_name, - target_namelen))) { - goto error_return; - } - /* - * If target does not exist and the rename crosses - * directories, adjust the target directory link count - * to account for the ".." reference from the new entry. - */ - error = XFS_DIR_CREATENAME(mp, tp, target_dp, target_name, - target_namelen, src_ip->i_ino, - &first_block, &free_list, spaceres); - if (error == ENOSPC) { - goto error_return; - } - if (error) { - goto abort_return; - } - xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); - - if (new_parent && src_is_directory) { - error = xfs_bumplink(tp, target_dp); - if (error) { - goto abort_return; - } - } - } else { /* target_ip != NULL */ - - /* - * If target exists and it's a directory, check that both - * target and source are directories and that target can be - * destroyed, or that neither is a directory. - */ - if ((target_ip->i_d.di_mode & S_IFMT) == S_IFDIR) { - /* - * Make sure target dir is empty. - */ - if (!(XFS_DIR_ISEMPTY(target_ip->i_mount, target_ip)) || - (target_ip->i_d.di_nlink > 2)) { - error = XFS_ERROR(EEXIST); - goto error_return; - } - } - - /* - * Link the source inode under the target name. - * If the source inode is a directory and we are moving - * it across directories, its ".." entry will be - * inconsistent until we replace that down below. - * - * In case there is already an entry with the same - * name at the destination directory, remove it first. - */ - error = XFS_DIR_REPLACE(mp, tp, target_dp, target_name, - target_namelen, src_ip->i_ino, &first_block, - &free_list, spaceres); - if (error) { - goto abort_return; - } - xfs_ichgtime(target_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); - - /* - * Decrement the link count on the target since the target - * dir no longer points to it. - */ - error = xfs_droplink(tp, target_ip); - if (error) { - goto abort_return; - } - target_ip_dropped = 1; - - if (src_is_directory) { - /* - * Drop the link from the old "." entry. - */ - error = xfs_droplink(tp, target_ip); - if (error) { - goto abort_return; - } - } - - /* Do this test while we still hold the locks */ - target_link_zero = (target_ip)->i_d.di_nlink==0; - - } /* target_ip != NULL */ - - /* - * Remove the source. - */ - if (new_parent && src_is_directory) { - - /* - * Rewrite the ".." entry to point to the new - * directory. - */ - error = XFS_DIR_REPLACE(mp, tp, src_ip, "..", 2, - target_dp->i_ino, &first_block, - &free_list, spaceres); - ASSERT(error != EEXIST); - if (error) { - goto abort_return; - } - xfs_ichgtime(src_ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); - - } else { - /* - * We always want to hit the ctime on the source inode. - * We do it in the if clause above for the 'new_parent && - * src_is_directory' case, and here we get all the other - * cases. This isn't strictly required by the standards - * since the source inode isn't really being changed, - * but old unix file systems did it and some incremental - * backup programs won't work without it. - */ - xfs_ichgtime(src_ip, XFS_ICHGTIME_CHG); - } - - /* - * Adjust the link count on src_dp. This is necessary when - * renaming a directory, either within one parent when - * the target existed, or across two parent directories. - */ - if (src_is_directory && (new_parent || target_ip != NULL)) { - - /* - * Decrement link count on src_directory since the - * entry that's moved no longer points to it. - */ - error = xfs_droplink(tp, src_dp); - if (error) { - goto abort_return; - } - } - - error = XFS_DIR_REMOVENAME(mp, tp, src_dp, src_name, src_namelen, - src_ip->i_ino, &first_block, &free_list, spaceres); - if (error) { - goto abort_return; - } - xfs_ichgtime(src_dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); - - /* - * Update the generation counts on all the directory inodes - * that we're modifying. - */ - src_dp->i_gen++; - xfs_trans_log_inode(tp, src_dp, XFS_ILOG_CORE); - - if (new_parent) { - target_dp->i_gen++; - xfs_trans_log_inode(tp, target_dp, XFS_ILOG_CORE); - } - - /* - * If there was a target inode, take an extra reference on - * it here so that it doesn't go to xfs_inactive() from - * within the commit. - */ - if (target_ip != NULL) { - IHOLD(target_ip); - } - - /* - * If this is a synchronous mount, make sure that the - * rename transaction goes to disk before returning to - * the user. - */ - if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { - xfs_trans_set_sync(tp); - } - - /* - * Take refs. for vop_link_removed calls below. No need to worry - * about directory refs. because the caller holds them. - * - * Do holds before the xfs_bmap_finish since it might rele them down - * to zero. - */ - - if (target_ip_dropped) - IHOLD(target_ip); - IHOLD(src_ip); - - error = xfs_bmap_finish(&tp, &free_list, first_block, &committed); - if (error) { - xfs_bmap_cancel(&free_list); - xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | - XFS_TRANS_ABORT)); - if (target_ip != NULL) { - IRELE(target_ip); - } - if (target_ip_dropped) { - IRELE(target_ip); - } - IRELE(src_ip); - goto std_return; - } - - /* - * trans_commit will unlock src_ip, target_ip & decrement - * the vnode references. - */ - error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); - if (target_ip != NULL) { - xfs_refcache_purge_ip(target_ip); - IRELE(target_ip); - } - /* - * Let interposed file systems know about removed links. - */ - if (target_ip_dropped) { - XVOP_LINK_REMOVED(XFS_ITOV(target_ip), target_dir_vp, - target_link_zero); - IRELE(target_ip); - } - - IRELE(src_ip); - - /* Fall through to std_return with error = 0 or errno from - * xfs_trans_commit */ -std_return: - if (DM_EVENT_ENABLED(src_dir_vp->v_vfsp, src_dp, DM_EVENT_POSTRENAME) || - DM_EVENT_ENABLED(target_dir_vp->v_vfsp, - target_dp, DM_EVENT_POSTRENAME)) { - (void) XFS_SEND_NAMESP (mp, DM_EVENT_POSTRENAME, - src_dir_vp, DM_RIGHT_NULL, - target_dir_vp, DM_RIGHT_NULL, - src_name, target_name, - 0, error, 0); - } - return error; - - abort_return: - cancel_flags |= XFS_TRANS_ABORT; - /* FALLTHROUGH */ - error_return: - xfs_bmap_cancel(&free_list); - xfs_trans_cancel(tp, cancel_flags); - goto std_return; - - rele_return: - IRELE(src_ip); - if (target_ip != NULL) { - IRELE(target_ip); - } - goto std_return; -} - |