/* * 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" /* * 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_read(ip, 0, XFS_B_TO_FSB(mp, pathlen), mval, &nmaps, 0); 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); if (!bp) return XFS_ERROR(ENOMEM); error = bp->b_error; if (error) { xfs_buf_ioerror_alert(bp, __func__); xfs_buf_relse(bp); goto out; } if (pathlen < byte_cnt) byte_cnt = pathlen; pathlen -= byte_cnt; memcpy(link, bp->b_addr, 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; xfs_fsize_t pathlen; int error = 0; trace_xfs_readlink(ip); if (XFS_FORCED_SHUTDOWN(mp)) return XFS_ERROR(EIO); xfs_ilock(ip, XFS_ILOCK_SHARED); pathlen = ip->i_d.di_size; if (!pathlen) goto out; if (pathlen < 0 || pathlen > MAXPATHLEN) { xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)", __func__, (unsigned long long) ip->i_ino, (long long) pathlen); ASSERT(0); return XFS_ERROR(EFSCORRUPTED); } 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_read(ip, end_fsb, map_len, &imap, &nimaps, 0); 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); 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_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, 0); error = xfs_itruncate_data(&tp, ip, ip->i_size); if (error) { /* * If we get an error at this point we simply don't * bother truncating the file. */ 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, 0); 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); error = xfs_bmapi_read(ip, 0, XFS_B_TO_FSB(mp, size), mval, &nmaps, 0); if (error) 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); if (!bp) { error = ENOMEM; goto error1; } 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, 0); 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, 0); 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 noticeable 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) { xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE); if (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) return 0; if ((S_ISREG(ip->i_d.di_mode) && ((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. * * Further, check if the inode is being opened, written and * closed frequently and we have delayed allocation blocks * outstanding (e.g. streaming writes from the NFS server), * truncating the blocks past EOF will cause fragmentation to * occur. * * In this case don't do the truncation, either, but we have to * be careful how we detect this case. Blocks beyond EOF show * up as i_delayed_blks even when the inode is clean, so we * need to truncate them away first before checking for a dirty * release. Hence on the first dirty close we will still remove * the speculative allocation, but after that we will leave it * in place. */ if (xfs_iflags_test(ip, XFS_IDIRTY_RELEASE)) return 0; error = xfs_free_eofblocks(mp, ip, XFS_FREE_EOF_TRYLOCK); if (error) return error; /* delalloc blocks after truncation means it really is dirty */ if (ip->i_delayed_blks) xfs_iflags_set(ip, XFS_IDIRTY_RELEASE); } 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)) && S_ISREG(ip->i_d.di_mode)); 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 ((S_ISREG(ip->i_d.di_mode) && ((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) { xfs_ilock(ip, XFS_IOLOCK_EXCL); 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, 0); error = xfs_itruncate_data(&tp, ip, 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 (S_ISLNK(ip->i_d.di_mode)) { /* * 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, 0); } 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, 0); } /* * 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)) { xfs_notice(mp, "%s: xfs_ifree returned error %d", __func__, error); 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_notice(mp, "%s: xfs_bmap_finish returned error %d", __func__, error); error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); if (error) xfs_notice(mp, "%s: xfs_trans_commit returned error %d", __func__, 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) return error; 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; } /* * 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(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); 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 out_release_inode; 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_release_inode: /* * Wait until after the current transaction is aborted to * release the inode. This prevents recursive transactions * and deadlocks from xfs_inactive. */ if (ip) IRELE(ip); xfs_qm_dqrele(udqp); xfs_qm_dqrele(gdqp); if (unlock_dp_on_error) xfs_iunlock(dp, XFS_ILOCK_EXCL); return error; } #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(tp, dp, XFS_ILOCK_EXCL); xfs_trans_ijoin(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(tp, sip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL); /* * If the source has too many links, we can't make any more to it. */ if (sip->i_d.di_nlink >= XFS_MAXLINK) { error = XFS_ERROR(EMLINK); goto error_return; } /* * If we are using project inheritance, we only allow hard link * creation in our tree when the project IDs are the same; else * the tree quota mechanism could be circumvented. */ if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && (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(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_write(tp, ip, first_fsb, fs_blocks, XFS_BMAPI_METADATA, &first_block, resblks, mval, &nmaps, &free_list); if (error) goto error2; 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); if (!bp) { error = ENOMEM; goto error2; } if (pathlen < byte_cnt) { byte_cnt = pathlen; } pathlen -= byte_cnt; memcpy(bp->b_addr, 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 error2; 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); } 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(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 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; 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, 0); xfs_bmap_init(&free_list, &firstfsb); error = xfs_bmapi_write(tp, ip, startoffset_fsb, allocatesize_fsb, alloc_type, &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); xfs_buf_unlock(bp); for (offset = startoff; offset <= endoff; offset = lastoffset + 1) { offset_fsb = XFS_B_TO_FSBT(mp, offset); nimap = 1; error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0); 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_buf_ioerror_alert(bp, "xfs_zero_remaining_bytes(read)"); break; } memset(bp->b_addr + (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_buf_ioerror_alert(bp, "xfs_zero_remaining_bytes(write)"); 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 */ inode_dio_wait(VFS_I(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_read(ip, startoffset_fsb, 1, &imap, &nimap, 0); 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_read(ip, endoffset_fsb - 1, 1, &imap, &nimap, 0); 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, 0); /* * 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_size(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, XFS_ILOCK_EXCL); 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); if (attr_flags & XFS_ATTR_SYNC) xfs_trans_set_sync(tp); return xfs_trans_commit(tp, 0); }