/* * 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 #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_trans_priv.h" #include "xfs_sb.h" #include "xfs_ag.h" #include "xfs_mount.h" #include "xfs_bmap_btree.h" #include "xfs_alloc_btree.h" #include "xfs_ialloc_btree.h" #include "xfs_attr_sf.h" #include "xfs_dinode.h" #include "xfs_inode.h" #include "xfs_buf_item.h" #include "xfs_inode_item.h" #include "xfs_btree.h" #include "xfs_alloc.h" #include "xfs_ialloc.h" #include "xfs_bmap.h" #include "xfs_error.h" #include "xfs_utils.h" #include "xfs_quota.h" #include "xfs_filestream.h" #include "xfs_vnodeops.h" #include "xfs_trace.h" #include "xfs_icache.h" kmem_zone_t *xfs_ifork_zone; kmem_zone_t *xfs_inode_zone; /* * Used in xfs_itruncate_extents(). This is the maximum number of extents * freed from a file in a single transaction. */ #define XFS_ITRUNC_MAX_EXTENTS 2 STATIC int xfs_iflush_int(xfs_inode_t *, xfs_buf_t *); STATIC int xfs_iformat_local(xfs_inode_t *, xfs_dinode_t *, int, int); STATIC int xfs_iformat_extents(xfs_inode_t *, xfs_dinode_t *, int); STATIC int xfs_iformat_btree(xfs_inode_t *, xfs_dinode_t *, int); /* * helper function to extract extent size hint from inode */ xfs_extlen_t xfs_get_extsz_hint( struct xfs_inode *ip) { if ((ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE) && ip->i_d.di_extsize) return ip->i_d.di_extsize; if (XFS_IS_REALTIME_INODE(ip)) return ip->i_mount->m_sb.sb_rextsize; return 0; } /* * This is a wrapper routine around the xfs_ilock() routine used to centralize * some grungy code. It is used in places that wish to lock the inode solely * for reading the extents. The reason these places can't just call * xfs_ilock(SHARED) is that the inode lock also guards to bringing in of the * extents from disk for a file in b-tree format. If the inode is in b-tree * format, then we need to lock the inode exclusively until the extents are read * in. Locking it exclusively all the time would limit our parallelism * unnecessarily, though. What we do instead is check to see if the extents * have been read in yet, and only lock the inode exclusively if they have not. * * The function returns a value which should be given to the corresponding * xfs_iunlock_map_shared(). This value is the mode in which the lock was * actually taken. */ uint xfs_ilock_map_shared( xfs_inode_t *ip) { uint lock_mode; if ((ip->i_d.di_format == XFS_DINODE_FMT_BTREE) && ((ip->i_df.if_flags & XFS_IFEXTENTS) == 0)) { lock_mode = XFS_ILOCK_EXCL; } else { lock_mode = XFS_ILOCK_SHARED; } xfs_ilock(ip, lock_mode); return lock_mode; } /* * This is simply the unlock routine to go with xfs_ilock_map_shared(). * All it does is call xfs_iunlock() with the given lock_mode. */ void xfs_iunlock_map_shared( xfs_inode_t *ip, unsigned int lock_mode) { xfs_iunlock(ip, lock_mode); } /* * The xfs inode contains 2 locks: a multi-reader lock called the * i_iolock and a multi-reader lock called the i_lock. This routine * allows either or both of the locks to be obtained. * * The 2 locks should always be ordered so that the IO lock is * obtained first in order to prevent deadlock. * * ip -- the inode being locked * lock_flags -- this parameter indicates the inode's locks * to be locked. It can be: * XFS_IOLOCK_SHARED, * XFS_IOLOCK_EXCL, * XFS_ILOCK_SHARED, * XFS_ILOCK_EXCL, * XFS_IOLOCK_SHARED | XFS_ILOCK_SHARED, * XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL, * XFS_IOLOCK_EXCL | XFS_ILOCK_SHARED, * XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL */ void xfs_ilock( xfs_inode_t *ip, uint lock_flags) { trace_xfs_ilock(ip, lock_flags, _RET_IP_); /* * You can't set both SHARED and EXCL for the same lock, * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, * and XFS_ILOCK_EXCL are valid values to set in lock_flags. */ ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); if (lock_flags & XFS_IOLOCK_EXCL) mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags)); else if (lock_flags & XFS_IOLOCK_SHARED) mraccess_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags)); if (lock_flags & XFS_ILOCK_EXCL) mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags)); else if (lock_flags & XFS_ILOCK_SHARED) mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags)); } /* * This is just like xfs_ilock(), except that the caller * is guaranteed not to sleep. It returns 1 if it gets * the requested locks and 0 otherwise. If the IO lock is * obtained but the inode lock cannot be, then the IO lock * is dropped before returning. * * ip -- the inode being locked * lock_flags -- this parameter indicates the inode's locks to be * to be locked. See the comment for xfs_ilock() for a list * of valid values. */ int xfs_ilock_nowait( xfs_inode_t *ip, uint lock_flags) { trace_xfs_ilock_nowait(ip, lock_flags, _RET_IP_); /* * You can't set both SHARED and EXCL for the same lock, * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, * and XFS_ILOCK_EXCL are valid values to set in lock_flags. */ ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); if (lock_flags & XFS_IOLOCK_EXCL) { if (!mrtryupdate(&ip->i_iolock)) goto out; } else if (lock_flags & XFS_IOLOCK_SHARED) { if (!mrtryaccess(&ip->i_iolock)) goto out; } if (lock_flags & XFS_ILOCK_EXCL) { if (!mrtryupdate(&ip->i_lock)) goto out_undo_iolock; } else if (lock_flags & XFS_ILOCK_SHARED) { if (!mrtryaccess(&ip->i_lock)) goto out_undo_iolock; } return 1; out_undo_iolock: if (lock_flags & XFS_IOLOCK_EXCL) mrunlock_excl(&ip->i_iolock); else if (lock_flags & XFS_IOLOCK_SHARED) mrunlock_shared(&ip->i_iolock); out: return 0; } /* * xfs_iunlock() is used to drop the inode locks acquired with * xfs_ilock() and xfs_ilock_nowait(). The caller must pass * in the flags given to xfs_ilock() or xfs_ilock_nowait() so * that we know which locks to drop. * * ip -- the inode being unlocked * lock_flags -- this parameter indicates the inode's locks to be * to be unlocked. See the comment for xfs_ilock() for a list * of valid values for this parameter. * */ void xfs_iunlock( xfs_inode_t *ip, uint lock_flags) { /* * You can't set both SHARED and EXCL for the same lock, * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, * and XFS_ILOCK_EXCL are valid values to set in lock_flags. */ ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); ASSERT(lock_flags != 0); if (lock_flags & XFS_IOLOCK_EXCL) mrunlock_excl(&ip->i_iolock); else if (lock_flags & XFS_IOLOCK_SHARED) mrunlock_shared(&ip->i_iolock); if (lock_flags & XFS_ILOCK_EXCL) mrunlock_excl(&ip->i_lock); else if (lock_flags & XFS_ILOCK_SHARED) mrunlock_shared(&ip->i_lock); trace_xfs_iunlock(ip, lock_flags, _RET_IP_); } /* * give up write locks. the i/o lock cannot be held nested * if it is being demoted. */ void xfs_ilock_demote( xfs_inode_t *ip, uint lock_flags) { ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)); ASSERT((lock_flags & ~(XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)) == 0); if (lock_flags & XFS_ILOCK_EXCL) mrdemote(&ip->i_lock); if (lock_flags & XFS_IOLOCK_EXCL) mrdemote(&ip->i_iolock); trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_); } #ifdef DEBUG int xfs_isilocked( xfs_inode_t *ip, uint lock_flags) { if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) { if (!(lock_flags & XFS_ILOCK_SHARED)) return !!ip->i_lock.mr_writer; return rwsem_is_locked(&ip->i_lock.mr_lock); } if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) { if (!(lock_flags & XFS_IOLOCK_SHARED)) return !!ip->i_iolock.mr_writer; return rwsem_is_locked(&ip->i_iolock.mr_lock); } ASSERT(0); return 0; } #endif void __xfs_iflock( struct xfs_inode *ip) { wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IFLOCK_BIT); DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IFLOCK_BIT); do { prepare_to_wait_exclusive(wq, &wait.wait, TASK_UNINTERRUPTIBLE); if (xfs_isiflocked(ip)) io_schedule(); } while (!xfs_iflock_nowait(ip)); finish_wait(wq, &wait.wait); } #ifdef DEBUG /* * Make sure that the extents in the given memory buffer * are valid. */ STATIC void xfs_validate_extents( xfs_ifork_t *ifp, int nrecs, xfs_exntfmt_t fmt) { xfs_bmbt_irec_t irec; xfs_bmbt_rec_host_t rec; int i; for (i = 0; i < nrecs; i++) { xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i); rec.l0 = get_unaligned(&ep->l0); rec.l1 = get_unaligned(&ep->l1); xfs_bmbt_get_all(&rec, &irec); if (fmt == XFS_EXTFMT_NOSTATE) ASSERT(irec.br_state == XFS_EXT_NORM); } } #else /* DEBUG */ #define xfs_validate_extents(ifp, nrecs, fmt) #endif /* DEBUG */ /* * Check that none of the inode's in the buffer have a next * unlinked field of 0. */ #if defined(DEBUG) void xfs_inobp_check( xfs_mount_t *mp, xfs_buf_t *bp) { int i; int j; xfs_dinode_t *dip; j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog; for (i = 0; i < j; i++) { dip = (xfs_dinode_t *)xfs_buf_offset(bp, i * mp->m_sb.sb_inodesize); if (!dip->di_next_unlinked) { xfs_alert(mp, "Detected bogus zero next_unlinked field in incore inode buffer 0x%p.", bp); ASSERT(dip->di_next_unlinked); } } } #endif /* * This routine is called to map an inode to the buffer containing the on-disk * version of the inode. It returns a pointer to the buffer containing the * on-disk inode in the bpp parameter, and in the dipp parameter it returns a * pointer to the on-disk inode within that buffer. * * If a non-zero error is returned, then the contents of bpp and dipp are * undefined. */ int xfs_imap_to_bp( struct xfs_mount *mp, struct xfs_trans *tp, struct xfs_imap *imap, struct xfs_dinode **dipp, struct xfs_buf **bpp, uint buf_flags, uint iget_flags) { struct xfs_buf *bp; int error; int i; int ni; buf_flags |= XBF_UNMAPPED; error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno, (int)imap->im_len, buf_flags, &bp); if (error) { if (error != EAGAIN) { xfs_warn(mp, "%s: xfs_trans_read_buf() returned error %d.", __func__, error); } else { ASSERT(buf_flags & XBF_TRYLOCK); } return error; } /* * Validate the magic number and version of every inode in the buffer * (if DEBUG kernel) or the first inode in the buffer, otherwise. */ #ifdef DEBUG ni = BBTOB(imap->im_len) >> mp->m_sb.sb_inodelog; #else /* usual case */ ni = 1; #endif for (i = 0; i < ni; i++) { int di_ok; xfs_dinode_t *dip; dip = (xfs_dinode_t *)xfs_buf_offset(bp, (i << mp->m_sb.sb_inodelog)); di_ok = dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) && XFS_DINODE_GOOD_VERSION(dip->di_version); if (unlikely(XFS_TEST_ERROR(!di_ok, mp, XFS_ERRTAG_ITOBP_INOTOBP, XFS_RANDOM_ITOBP_INOTOBP))) { if (iget_flags & XFS_IGET_UNTRUSTED) { xfs_trans_brelse(tp, bp); return XFS_ERROR(EINVAL); } XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_HIGH, mp, dip); #ifdef DEBUG xfs_emerg(mp, "bad inode magic/vsn daddr %lld #%d (magic=%x)", (unsigned long long)imap->im_blkno, i, be16_to_cpu(dip->di_magic)); ASSERT(0); #endif xfs_trans_brelse(tp, bp); return XFS_ERROR(EFSCORRUPTED); } } xfs_inobp_check(mp, bp); *bpp = bp; *dipp = (struct xfs_dinode *)xfs_buf_offset(bp, imap->im_boffset); return 0; } /* * Move inode type and inode format specific information from the * on-disk inode to the in-core inode. For fifos, devs, and sockets * this means set if_rdev to the proper value. For files, directories, * and symlinks this means to bring in the in-line data or extent * pointers. For a file in B-tree format, only the root is immediately * brought in-core. The rest will be in-lined in if_extents when it * is first referenced (see xfs_iread_extents()). */ STATIC int xfs_iformat( xfs_inode_t *ip, xfs_dinode_t *dip) { xfs_attr_shortform_t *atp; int size; int error = 0; xfs_fsize_t di_size; if (unlikely(be32_to_cpu(dip->di_nextents) + be16_to_cpu(dip->di_anextents) > be64_to_cpu(dip->di_nblocks))) { xfs_warn(ip->i_mount, "corrupt dinode %Lu, extent total = %d, nblocks = %Lu.", (unsigned long long)ip->i_ino, (int)(be32_to_cpu(dip->di_nextents) + be16_to_cpu(dip->di_anextents)), (unsigned long long) be64_to_cpu(dip->di_nblocks)); XFS_CORRUPTION_ERROR("xfs_iformat(1)", XFS_ERRLEVEL_LOW, ip->i_mount, dip); return XFS_ERROR(EFSCORRUPTED); } if (unlikely(dip->di_forkoff > ip->i_mount->m_sb.sb_inodesize)) { xfs_warn(ip->i_mount, "corrupt dinode %Lu, forkoff = 0x%x.", (unsigned long long)ip->i_ino, dip->di_forkoff); XFS_CORRUPTION_ERROR("xfs_iformat(2)", XFS_ERRLEVEL_LOW, ip->i_mount, dip); return XFS_ERROR(EFSCORRUPTED); } if (unlikely((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) && !ip->i_mount->m_rtdev_targp)) { xfs_warn(ip->i_mount, "corrupt dinode %Lu, has realtime flag set.", ip->i_ino); XFS_CORRUPTION_ERROR("xfs_iformat(realtime)", XFS_ERRLEVEL_LOW, ip->i_mount, dip); return XFS_ERROR(EFSCORRUPTED); } switch (ip->i_d.di_mode & S_IFMT) { case S_IFIFO: case S_IFCHR: case S_IFBLK: case S_IFSOCK: if (unlikely(dip->di_format != XFS_DINODE_FMT_DEV)) { XFS_CORRUPTION_ERROR("xfs_iformat(3)", XFS_ERRLEVEL_LOW, ip->i_mount, dip); return XFS_ERROR(EFSCORRUPTED); } ip->i_d.di_size = 0; ip->i_df.if_u2.if_rdev = xfs_dinode_get_rdev(dip); break; case S_IFREG: case S_IFLNK: case S_IFDIR: switch (dip->di_format) { case XFS_DINODE_FMT_LOCAL: /* * no local regular files yet */ if (unlikely(S_ISREG(be16_to_cpu(dip->di_mode)))) { xfs_warn(ip->i_mount, "corrupt inode %Lu (local format for regular file).", (unsigned long long) ip->i_ino); XFS_CORRUPTION_ERROR("xfs_iformat(4)", XFS_ERRLEVEL_LOW, ip->i_mount, dip); return XFS_ERROR(EFSCORRUPTED); } di_size = be64_to_cpu(dip->di_size); if (unlikely(di_size > XFS_DFORK_DSIZE(dip, ip->i_mount))) { xfs_warn(ip->i_mount, "corrupt inode %Lu (bad size %Ld for local inode).", (unsigned long long) ip->i_ino, (long long) di_size); XFS_CORRUPTION_ERROR("xfs_iformat(5)", XFS_ERRLEVEL_LOW, ip->i_mount, dip); return XFS_ERROR(EFSCORRUPTED); } size = (int)di_size; error = xfs_iformat_local(ip, dip, XFS_DATA_FORK, size); break; case XFS_DINODE_FMT_EXTENTS: error = xfs_iformat_extents(ip, dip, XFS_DATA_FORK); break; case XFS_DINODE_FMT_BTREE: error = xfs_iformat_btree(ip, dip, XFS_DATA_FORK); break; default: XFS_ERROR_REPORT("xfs_iformat(6)", XFS_ERRLEVEL_LOW, ip->i_mount); return XFS_ERROR(EFSCORRUPTED); } break; default: XFS_ERROR_REPORT("xfs_iformat(7)", XFS_ERRLEVEL_LOW, ip->i_mount); return XFS_ERROR(EFSCORRUPTED); } if (error) { return error; } if (!XFS_DFORK_Q(dip)) return 0; ASSERT(ip->i_afp == NULL); ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP | KM_NOFS); switch (dip->di_aformat) { case XFS_DINODE_FMT_LOCAL: atp = (xfs_attr_shortform_t *)XFS_DFORK_APTR(dip); size = be16_to_cpu(atp->hdr.totsize); if (unlikely(size < sizeof(struct xfs_attr_sf_hdr))) { xfs_warn(ip->i_mount, "corrupt inode %Lu (bad attr fork size %Ld).", (unsigned long long) ip->i_ino, (long long) size); XFS_CORRUPTION_ERROR("xfs_iformat(8)", XFS_ERRLEVEL_LOW, ip->i_mount, dip); return XFS_ERROR(EFSCORRUPTED); } error = xfs_iformat_local(ip, dip, XFS_ATTR_FORK, size); break; case XFS_DINODE_FMT_EXTENTS: error = xfs_iformat_extents(ip, dip, XFS_ATTR_FORK); break; case XFS_DINODE_FMT_BTREE: error = xfs_iformat_btree(ip, dip, XFS_ATTR_FORK); break; default: error = XFS_ERROR(EFSCORRUPTED); break; } if (error) { kmem_zone_free(xfs_ifork_zone, ip->i_afp); ip->i_afp = NULL; xfs_idestroy_fork(ip, XFS_DATA_FORK); } return error; } /* * The file is in-lined in the on-disk inode. * If it fits into if_inline_data, then copy * it there, otherwise allocate a buffer for it * and copy the data there. Either way, set * if_data to point at the data. * If we allocate a buffer for the data, make * sure that its size is a multiple of 4 and * record the real size in i_real_bytes. */ STATIC int xfs_iformat_local( xfs_inode_t *ip, xfs_dinode_t *dip, int whichfork, int size) { xfs_ifork_t *ifp; int real_size; /* * If the size is unreasonable, then something * is wrong and we just bail out rather than crash in * kmem_alloc() or memcpy() below. */ if (unlikely(size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) { xfs_warn(ip->i_mount, "corrupt inode %Lu (bad size %d for local fork, size = %d).", (unsigned long long) ip->i_ino, size, XFS_DFORK_SIZE(dip, ip->i_mount, whichfork)); XFS_CORRUPTION_ERROR("xfs_iformat_local", XFS_ERRLEVEL_LOW, ip->i_mount, dip); return XFS_ERROR(EFSCORRUPTED); } ifp = XFS_IFORK_PTR(ip, whichfork); real_size = 0; if (size == 0) ifp->if_u1.if_data = NULL; else if (size <= sizeof(ifp->if_u2.if_inline_data)) ifp->if_u1.if_data = ifp->if_u2.if_inline_data; else { real_size = roundup(size, 4); ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP | KM_NOFS); } ifp->if_bytes = size; ifp->if_real_bytes = real_size; if (size) memcpy(ifp->if_u1.if_data, XFS_DFORK_PTR(dip, whichfork), size); ifp->if_flags &= ~XFS_IFEXTENTS; ifp->if_flags |= XFS_IFINLINE; return 0; } /* * The file consists of a set of extents all * of which fit into the on-disk inode. * If there are few enough extents to fit into * the if_inline_ext, then copy them there. * Otherwise allocate a buffer for them and copy * them into it. Either way, set if_extents * to point at the extents. */ STATIC int xfs_iformat_extents( xfs_inode_t *ip, xfs_dinode_t *dip, int whichfork) { xfs_bmbt_rec_t *dp; xfs_ifork_t *ifp; int nex; int size; int i; ifp = XFS_IFORK_PTR(ip, whichfork); nex = XFS_DFORK_NEXTENTS(dip, whichfork); size = nex * (uint)sizeof(xfs_bmbt_rec_t); /* * If the number of extents is unreasonable, then something * is wrong and we just bail out rather than crash in * kmem_alloc() or memcpy() below. */ if (unlikely(size < 0 || size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) { xfs_warn(ip->i_mount, "corrupt inode %Lu ((a)extents = %d).", (unsigned long long) ip->i_ino, nex); XFS_CORRUPTION_ERROR("xfs_iformat_extents(1)", XFS_ERRLEVEL_LOW, ip->i_mount, dip); return XFS_ERROR(EFSCORRUPTED); } ifp->if_real_bytes = 0; if (nex == 0) ifp->if_u1.if_extents = NULL; else if (nex <= XFS_INLINE_EXTS) ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext; else xfs_iext_add(ifp, 0, nex); ifp->if_bytes = size; if (size) { dp = (xfs_bmbt_rec_t *) XFS_DFORK_PTR(dip, whichfork); xfs_validate_extents(ifp, nex, XFS_EXTFMT_INODE(ip)); for (i = 0; i < nex; i++, dp++) { xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i); ep->l0 = get_unaligned_be64(&dp->l0); ep->l1 = get_unaligned_be64(&dp->l1); } XFS_BMAP_TRACE_EXLIST(ip, nex, whichfork); if (whichfork != XFS_DATA_FORK || XFS_EXTFMT_INODE(ip) == XFS_EXTFMT_NOSTATE) if (unlikely(xfs_check_nostate_extents( ifp, 0, nex))) { XFS_ERROR_REPORT("xfs_iformat_extents(2)", XFS_ERRLEVEL_LOW, ip->i_mount); return XFS_ERROR(EFSCORRUPTED); } } ifp->if_flags |= XFS_IFEXTENTS; return 0; } /* * The file has too many extents to fit into * the inode, so they are in B-tree format. * Allocate a buffer for the root of the B-tree * and copy the root into it. The i_extents * field will remain NULL until all of the * extents are read in (when they are needed). */ STATIC int xfs_iformat_btree( xfs_inode_t *ip, xfs_dinode_t *dip, int whichfork) { xfs_bmdr_block_t *dfp; xfs_ifork_t *ifp; /* REFERENCED */ int nrecs; int size; ifp = XFS_IFORK_PTR(ip, whichfork); dfp = (xfs_bmdr_block_t *)XFS_DFORK_PTR(dip, whichfork); size = XFS_BMAP_BROOT_SPACE(dfp); nrecs = be16_to_cpu(dfp->bb_numrecs); /* * blow out if -- fork has less extents than can fit in * fork (fork shouldn't be a btree format), root btree * block has more records than can fit into the fork, * or the number of extents is greater than the number of * blocks. */ if (unlikely(XFS_IFORK_NEXTENTS(ip, whichfork) <= XFS_IFORK_MAXEXT(ip, whichfork) || XFS_BMDR_SPACE_CALC(nrecs) > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork) || XFS_IFORK_NEXTENTS(ip, whichfork) > ip->i_d.di_nblocks)) { xfs_warn(ip->i_mount, "corrupt inode %Lu (btree).", (unsigned long long) ip->i_ino); XFS_CORRUPTION_ERROR("xfs_iformat_btree", XFS_ERRLEVEL_LOW, ip->i_mount, dip); return XFS_ERROR(EFSCORRUPTED); } ifp->if_broot_bytes = size; ifp->if_broot = kmem_alloc(size, KM_SLEEP | KM_NOFS); ASSERT(ifp->if_broot != NULL); /* * Copy and convert from the on-disk structure * to the in-memory structure. */ xfs_bmdr_to_bmbt(ip->i_mount, dfp, XFS_DFORK_SIZE(dip, ip->i_mount, whichfork), ifp->if_broot, size); ifp->if_flags &= ~XFS_IFEXTENTS; ifp->if_flags |= XFS_IFBROOT; return 0; } STATIC void xfs_dinode_from_disk( xfs_icdinode_t *to, xfs_dinode_t *from) { to->di_magic = be16_to_cpu(from->di_magic); to->di_mode = be16_to_cpu(from->di_mode); to->di_version = from ->di_version; to->di_format = from->di_format; to->di_onlink = be16_to_cpu(from->di_onlink); to->di_uid = be32_to_cpu(from->di_uid); to->di_gid = be32_to_cpu(from->di_gid); to->di_nlink = be32_to_cpu(from->di_nlink); to->di_projid_lo = be16_to_cpu(from->di_projid_lo); to->di_projid_hi = be16_to_cpu(from->di_projid_hi); memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad)); to->di_flushiter = be16_to_cpu(from->di_flushiter); to->di_atime.t_sec = be32_to_cpu(from->di_atime.t_sec); to->di_atime.t_nsec = be32_to_cpu(from->di_atime.t_nsec); to->di_mtime.t_sec = be32_to_cpu(from->di_mtime.t_sec); to->di_mtime.t_nsec = be32_to_cpu(from->di_mtime.t_nsec); to->di_ctime.t_sec = be32_to_cpu(from->di_ctime.t_sec); to->di_ctime.t_nsec = be32_to_cpu(from->di_ctime.t_nsec); to->di_size = be64_to_cpu(from->di_size); to->di_nblocks = be64_to_cpu(from->di_nblocks); to->di_extsize = be32_to_cpu(from->di_extsize); to->di_nextents = be32_to_cpu(from->di_nextents); to->di_anextents = be16_to_cpu(from->di_anextents); to->di_forkoff = from->di_forkoff; to->di_aformat = from->di_aformat; to->di_dmevmask = be32_to_cpu(from->di_dmevmask); to->di_dmstate = be16_to_cpu(from->di_dmstate); to->di_flags = be16_to_cpu(from->di_flags); to->di_gen = be32_to_cpu(from->di_gen); } void xfs_dinode_to_disk( xfs_dinode_t *to, xfs_icdinode_t *from) { to->di_magic = cpu_to_be16(from->di_magic); to->di_mode = cpu_to_be16(from->di_mode); to->di_version = from ->di_version; to->di_format = from->di_format; to->di_onlink = cpu_to_be16(from->di_onlink); to->di_uid = cpu_to_be32(from->di_uid); to->di_gid = cpu_to_be32(from->di_gid); to->di_nlink = cpu_to_be32(from->di_nlink); to->di_projid_lo = cpu_to_be16(from->di_projid_lo); to->di_projid_hi = cpu_to_be16(from->di_projid_hi); memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad)); to->di_flushiter = cpu_to_be16(from->di_flushiter); to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec); to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec); to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec); to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec); to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec); to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec); to->di_size = cpu_to_be64(from->di_size); to->di_nblocks = cpu_to_be64(from->di_nblocks); to->di_extsize = cpu_to_be32(from->di_extsize); to->di_nextents = cpu_to_be32(from->di_nextents); to->di_anextents = cpu_to_be16(from->di_anextents); to->di_forkoff = from->di_forkoff; to->di_aformat = from->di_aformat; to->di_dmevmask = cpu_to_be32(from->di_dmevmask); to->di_dmstate = cpu_to_be16(from->di_dmstate); to->di_flags = cpu_to_be16(from->di_flags); to->di_gen = cpu_to_be32(from->di_gen); } STATIC uint _xfs_dic2xflags( __uint16_t di_flags) { uint flags = 0; if (di_flags & XFS_DIFLAG_ANY) { if (di_flags & XFS_DIFLAG_REALTIME) flags |= XFS_XFLAG_REALTIME; if (di_flags & XFS_DIFLAG_PREALLOC) flags |= XFS_XFLAG_PREALLOC; if (di_flags & XFS_DIFLAG_IMMUTABLE) flags |= XFS_XFLAG_IMMUTABLE; if (di_flags & XFS_DIFLAG_APPEND) flags |= XFS_XFLAG_APPEND; if (di_flags & XFS_DIFLAG_SYNC) flags |= XFS_XFLAG_SYNC; if (di_flags & XFS_DIFLAG_NOATIME) flags |= XFS_XFLAG_NOATIME; if (di_flags & XFS_DIFLAG_NODUMP) flags |= XFS_XFLAG_NODUMP; if (di_flags & XFS_DIFLAG_RTINHERIT) flags |= XFS_XFLAG_RTINHERIT; if (di_flags & XFS_DIFLAG_PROJINHERIT) flags |= XFS_XFLAG_PROJINHERIT; if (di_flags & XFS_DIFLAG_NOSYMLINKS) flags |= XFS_XFLAG_NOSYMLINKS; if (di_flags & XFS_DIFLAG_EXTSIZE) flags |= XFS_XFLAG_EXTSIZE; if (di_flags & XFS_DIFLAG_EXTSZINHERIT) flags |= XFS_XFLAG_EXTSZINHERIT; if (di_flags & XFS_DIFLAG_NODEFRAG) flags |= XFS_XFLAG_NODEFRAG; if (di_flags & XFS_DIFLAG_FILESTREAM) flags |= XFS_XFLAG_FILESTREAM; } return flags; } uint xfs_ip2xflags( xfs_inode_t *ip) { xfs_icdinode_t *dic = &ip->i_d; return _xfs_dic2xflags(dic->di_flags) | (XFS_IFORK_Q(ip) ? XFS_XFLAG_HASATTR : 0); } uint xfs_dic2xflags( xfs_dinode_t *dip) { return _xfs_dic2xflags(be16_to_cpu(dip->di_flags)) | (XFS_DFORK_Q(dip) ? XFS_XFLAG_HASATTR : 0); } /* * Read the disk inode attributes into the in-core inode structure. */ int xfs_iread( xfs_mount_t *mp, xfs_trans_t *tp, xfs_inode_t *ip, uint iget_flags) { xfs_buf_t *bp; xfs_dinode_t *dip; int error; /* * Fill in the location information in the in-core inode. */ error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags); if (error) return error; /* * Get pointers to the on-disk inode and the buffer containing it. */ error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &bp, 0, iget_flags); if (error) return error; /* * If we got something that isn't an inode it means someone * (nfs or dmi) has a stale handle. */ if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC)) { #ifdef DEBUG xfs_alert(mp, "%s: dip->di_magic (0x%x) != XFS_DINODE_MAGIC (0x%x)", __func__, be16_to_cpu(dip->di_magic), XFS_DINODE_MAGIC); #endif /* DEBUG */ error = XFS_ERROR(EINVAL); goto out_brelse; } /* * If the on-disk inode is already linked to a directory * entry, copy all of the inode into the in-core inode. * xfs_iformat() handles copying in the inode format * specific information. * Otherwise, just get the truly permanent information. */ if (dip->di_mode) { xfs_dinode_from_disk(&ip->i_d, dip); error = xfs_iformat(ip, dip); if (error) { #ifdef DEBUG xfs_alert(mp, "%s: xfs_iformat() returned error %d", __func__, error); #endif /* DEBUG */ goto out_brelse; } } else { ip->i_d.di_magic = be16_to_cpu(dip->di_magic); ip->i_d.di_version = dip->di_version; ip->i_d.di_gen = be32_to_cpu(dip->di_gen); ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter); /* * Make sure to pull in the mode here as well in * case the inode is released without being used. * This ensures that xfs_inactive() will see that * the inode is already free and not try to mess * with the uninitialized part of it. */ ip->i_d.di_mode = 0; } /* * The inode format changed when we moved the link count and * made it 32 bits long. If this is an old format inode, * convert it in memory to look like a new one. If it gets * flushed to disk we will convert back before flushing or * logging it. We zero out the new projid field and the old link * count field. We'll handle clearing the pad field (the remains * of the old uuid field) when we actually convert the inode to * the new format. We don't change the version number so that we * can distinguish this from a real new format inode. */ if (ip->i_d.di_version == 1) { ip->i_d.di_nlink = ip->i_d.di_onlink; ip->i_d.di_onlink = 0; xfs_set_projid(ip, 0); } ip->i_delayed_blks = 0; /* * Mark the buffer containing the inode as something to keep * around for a while. This helps to keep recently accessed * meta-data in-core longer. */ xfs_buf_set_ref(bp, XFS_INO_REF); /* * Use xfs_trans_brelse() to release the buffer containing the * on-disk inode, because it was acquired with xfs_trans_read_buf() * in xfs_imap_to_bp() above. If tp is NULL, this is just a normal * brelse(). If we're within a transaction, then xfs_trans_brelse() * will only release the buffer if it is not dirty within the * transaction. It will be OK to release the buffer in this case, * because inodes on disk are never destroyed and we will be * locking the new in-core inode before putting it in the hash * table where other processes can find it. Thus we don't have * to worry about the inode being changed just because we released * the buffer. */ out_brelse: xfs_trans_brelse(tp, bp); return error; } /* * Read in extents from a btree-format inode. * Allocate and fill in if_extents. Real work is done in xfs_bmap.c. */ int xfs_iread_extents( xfs_trans_t *tp, xfs_inode_t *ip, int whichfork) { int error; xfs_ifork_t *ifp; xfs_extnum_t nextents; if (unlikely(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) { XFS_ERROR_REPORT("xfs_iread_extents", XFS_ERRLEVEL_LOW, ip->i_mount); return XFS_ERROR(EFSCORRUPTED); } nextents = XFS_IFORK_NEXTENTS(ip, whichfork); ifp = XFS_IFORK_PTR(ip, whichfork); /* * We know that the size is valid (it's checked in iformat_btree) */ ifp->if_bytes = ifp->if_real_bytes = 0; ifp->if_flags |= XFS_IFEXTENTS; xfs_iext_add(ifp, 0, nextents); error = xfs_bmap_read_extents(tp, ip, whichfork); if (error) { xfs_iext_destroy(ifp); ifp->if_flags &= ~XFS_IFEXTENTS; return error; } xfs_validate_extents(ifp, nextents, XFS_EXTFMT_INODE(ip)); return 0; } /* * Allocate an inode on disk and return a copy of its in-core version. * The in-core inode is locked exclusively. Set mode, nlink, and rdev * appropriately within the inode. The uid and gid for the inode are * set according to the contents of the given cred structure. * * Use xfs_dialloc() to allocate the on-disk inode. If xfs_dialloc() * has a free inode available, call xfs_iget() to obtain the in-core * version of the allocated inode. Finally, fill in the inode and * log its initial contents. In this case, ialloc_context would be * set to NULL. * * If xfs_dialloc() does not have an available inode, it will replenish * its supply by doing an allocation. Since we can only do one * allocation within a transaction without deadlocks, we must commit * the current transaction before returning the inode itself. * In this case, therefore, we will set ialloc_context and return. * The caller should then commit the current transaction, start a new * transaction, and call xfs_ialloc() again to actually get the inode. * * To ensure that some other process does not grab the inode that * was allocated during the first call to xfs_ialloc(), this routine * also returns the [locked] bp pointing to the head of the freelist * as ialloc_context. The caller should hold this buffer across * the commit and pass it back into this routine on the second call. * * If we are allocating quota inodes, we do not have a parent inode * to attach to or associate with (i.e. pip == NULL) because they * are not linked into the directory structure - they are attached * directly to the superblock - and so have no parent. */ int xfs_ialloc( xfs_trans_t *tp, xfs_inode_t *pip, umode_t mode, xfs_nlink_t nlink, xfs_dev_t rdev, prid_t prid, int okalloc, xfs_buf_t **ialloc_context, xfs_inode_t **ipp) { xfs_ino_t ino; xfs_inode_t *ip; uint flags; int error; timespec_t tv; int filestreams = 0; /* * Call the space management code to pick * the on-disk inode to be allocated. */ error = xfs_dialloc(tp, pip ? pip->i_ino : 0, mode, okalloc, ialloc_context, &ino); if (error) return error; if (*ialloc_context || ino == NULLFSINO) { *ipp = NULL; return 0; } ASSERT(*ialloc_context == NULL); /* * Get the in-core inode with the lock held exclusively. * This is because we're setting fields here we need * to prevent others from looking at until we're done. */ error = xfs_iget(tp->t_mountp, tp, ino, XFS_IGET_CREATE, XFS_ILOCK_EXCL, &ip); if (error) return error; ASSERT(ip != NULL); ip->i_d.di_mode = mode; ip->i_d.di_onlink = 0; ip->i_d.di_nlink = nlink; ASSERT(ip->i_d.di_nlink == nlink); ip->i_d.di_uid = current_fsuid(); ip->i_d.di_gid = current_fsgid(); xfs_set_projid(ip, prid); memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad)); /* * If the superblock version is up to where we support new format * inodes and this is currently an old format inode, then change * the inode version number now. This way we only do the conversion * here rather than here and in the flush/logging code. */ if (xfs_sb_version_hasnlink(&tp->t_mountp->m_sb) && ip->i_d.di_version == 1) { ip->i_d.di_version = 2; /* * We've already zeroed the old link count, the projid field, * and the pad field. */ } /* * Project ids won't be stored on disk if we are using a version 1 inode. */ if ((prid != 0) && (ip->i_d.di_version == 1)) xfs_bump_ino_vers2(tp, ip); if (pip && XFS_INHERIT_GID(pip)) { ip->i_d.di_gid = pip->i_d.di_gid; if ((pip->i_d.di_mode & S_ISGID) && S_ISDIR(mode)) { ip->i_d.di_mode |= S_ISGID; } } /* * If the group ID of the new file does not match the effective group * ID or one of the supplementary group IDs, the S_ISGID bit is cleared * (and only if the irix_sgid_inherit compatibility variable is set). */ if ((irix_sgid_inherit) && (ip->i_d.di_mode & S_ISGID) && (!in_group_p((gid_t)ip->i_d.di_gid))) { ip->i_d.di_mode &= ~S_ISGID; } ip->i_d.di_size = 0; ip->i_d.di_nextents = 0; ASSERT(ip->i_d.di_nblocks == 0); nanotime(&tv); ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec; ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec; ip->i_d.di_atime = ip->i_d.di_mtime; ip->i_d.di_ctime = ip->i_d.di_mtime; /* * di_gen will have been taken care of in xfs_iread. */ ip->i_d.di_extsize = 0; ip->i_d.di_dmevmask = 0; ip->i_d.di_dmstate = 0; ip->i_d.di_flags = 0; flags = XFS_ILOG_CORE; switch (mode & S_IFMT) { case S_IFIFO: case S_IFCHR: case S_IFBLK: case S_IFSOCK: ip->i_d.di_format = XFS_DINODE_FMT_DEV; ip->i_df.if_u2.if_rdev = rdev; ip->i_df.if_flags = 0; flags |= XFS_ILOG_DEV; break; case S_IFREG: /* * we can't set up filestreams until after the VFS inode * is set up properly. */ if (pip && xfs_inode_is_filestream(pip)) filestreams = 1; /* fall through */ case S_IFDIR: if (pip && (pip->i_d.di_flags & XFS_DIFLAG_ANY)) { uint di_flags = 0; if (S_ISDIR(mode)) { if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT) di_flags |= XFS_DIFLAG_RTINHERIT; if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) { di_flags |= XFS_DIFLAG_EXTSZINHERIT; ip->i_d.di_extsize = pip->i_d.di_extsize; } } else if (S_ISREG(mode)) { if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT) di_flags |= XFS_DIFLAG_REALTIME; if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) { di_flags |= XFS_DIFLAG_EXTSIZE; ip->i_d.di_extsize = pip->i_d.di_extsize; } } if ((pip->i_d.di_flags & XFS_DIFLAG_NOATIME) && xfs_inherit_noatime) di_flags |= XFS_DIFLAG_NOATIME; if ((pip->i_d.di_flags & XFS_DIFLAG_NODUMP) && xfs_inherit_nodump) di_flags |= XFS_DIFLAG_NODUMP; if ((pip->i_d.di_flags & XFS_DIFLAG_SYNC) && xfs_inherit_sync) di_flags |= XFS_DIFLAG_SYNC; if ((pip->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) && xfs_inherit_nosymlinks) di_flags |= XFS_DIFLAG_NOSYMLINKS; if (pip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) di_flags |= XFS_DIFLAG_PROJINHERIT; if ((pip->i_d.di_flags & XFS_DIFLAG_NODEFRAG) && xfs_inherit_nodefrag) di_flags |= XFS_DIFLAG_NODEFRAG; if (pip->i_d.di_flags & XFS_DIFLAG_FILESTREAM) di_flags |= XFS_DIFLAG_FILESTREAM; ip->i_d.di_flags |= di_flags; } /* FALLTHROUGH */ case S_IFLNK: ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS; ip->i_df.if_flags = XFS_IFEXTENTS; ip->i_df.if_bytes = ip->i_df.if_real_bytes = 0; ip->i_df.if_u1.if_extents = NULL; break; default: ASSERT(0); } /* * Attribute fork settings for new inode. */ ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS; ip->i_d.di_anextents = 0; /* * Log the new values stuffed into the inode. */ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); xfs_trans_log_inode(tp, ip, flags); /* now that we have an i_mode we can setup inode ops and unlock */ xfs_setup_inode(ip); /* now we have set up the vfs inode we can associate the filestream */ if (filestreams) { error = xfs_filestream_associate(pip, ip); if (error < 0) return -error; if (!error) xfs_iflags_set(ip, XFS_IFILESTREAM); } *ipp = ip; return 0; } /* * Free up the underlying blocks past new_size. The new size must be smaller * than the current size. This routine can be used both for the attribute and * data fork, and does not modify the inode size, which is left to the caller. * * The transaction passed to this routine must have made a permanent log * reservation of at least XFS_ITRUNCATE_LOG_RES. This routine may commit the * given transaction and start new ones, so make sure everything involved in * the transaction is tidy before calling here. Some transaction will be * returned to the caller to be committed. The incoming transaction must * already include the inode, and both inode locks must be held exclusively. * The inode must also be "held" within the transaction. On return the inode * will be "held" within the returned transaction. This routine does NOT * require any disk space to be reserved for it within the transaction. * * If we get an error, we must return with the inode locked and linked into the * current transaction. This keeps things simple for the higher level code, * because it always knows that the inode is locked and held in the transaction * that returns to it whether errors occur or not. We don't mark the inode * dirty on error so that transactions can be easily aborted if possible. */ int xfs_itruncate_extents( struct xfs_trans **tpp, struct xfs_inode *ip, int whichfork, xfs_fsize_t new_size) { struct xfs_mount *mp = ip->i_mount; struct xfs_trans *tp = *tpp; struct xfs_trans *ntp; xfs_bmap_free_t free_list; xfs_fsblock_t first_block; xfs_fileoff_t first_unmap_block; xfs_fileoff_t last_block; xfs_filblks_t unmap_len; int committed; int error = 0; int done = 0; ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); ASSERT(!atomic_read(&VFS_I(ip)->i_count) || xfs_isilocked(ip, XFS_IOLOCK_EXCL)); ASSERT(new_size <= XFS_ISIZE(ip)); ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES); ASSERT(ip->i_itemp != NULL); ASSERT(ip->i_itemp->ili_lock_flags == 0); ASSERT(!XFS_NOT_DQATTACHED(mp, ip)); trace_xfs_itruncate_extents_start(ip, new_size); /* * Since it is possible for space to become allocated beyond * the end of the file (in a crash where the space is allocated * but the inode size is not yet updated), simply remove any * blocks which show up between the new EOF and the maximum * possible file size. If the first block to be removed is * beyond the maximum file size (ie it is the same as last_block), * then there is nothing to do. */ first_unmap_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size); last_block = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes); if (first_unmap_block == last_block) return 0; ASSERT(first_unmap_block < last_block); unmap_len = last_block - first_unmap_block + 1; while (!done) { xfs_bmap_init(&free_list, &first_block); error = xfs_bunmapi(tp, ip, first_unmap_block, unmap_len, xfs_bmapi_aflag(whichfork), XFS_ITRUNC_MAX_EXTENTS, &first_block, &free_list, &done); if (error) goto out_bmap_cancel; /* * Duplicate the transaction that has the permanent * reservation and commit the old transaction. */ error = xfs_bmap_finish(&tp, &free_list, &committed); if (committed) xfs_trans_ijoin(tp, ip, 0); if (error) goto out_bmap_cancel; if (committed) { /* * Mark the inode dirty so it will be logged and * moved forward in the log as part of every commit. */ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); } ntp = xfs_trans_dup(tp); error = xfs_trans_commit(tp, 0); tp = ntp; xfs_trans_ijoin(tp, ip, 0); if (error) goto out; /* * 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); error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT); if (error) goto out; } /* * Always re-log the inode so that our permanent transaction can keep * on rolling it forward in the log. */ xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); trace_xfs_itruncate_extents_end(ip, new_size); out: *tpp = tp; return error; out_bmap_cancel: /* * If the bunmapi call encounters an error, return to the caller where * the transaction can be properly aborted. We just need to make sure * we're not holding any resources that we were not when we came in. */ xfs_bmap_cancel(&free_list); goto out; } /* * This is called when the inode's link count goes to 0. * We place the on-disk inode on a list in the AGI. It * will be pulled from this list when the inode is freed. */ int xfs_iunlink( xfs_trans_t *tp, xfs_inode_t *ip) { xfs_mount_t *mp; xfs_agi_t *agi; xfs_dinode_t *dip; xfs_buf_t *agibp; xfs_buf_t *ibp; xfs_agino_t agino; short bucket_index; int offset; int error; ASSERT(ip->i_d.di_nlink == 0); ASSERT(ip->i_d.di_mode != 0); mp = tp->t_mountp; /* * Get the agi buffer first. It ensures lock ordering * on the list. */ error = xfs_read_agi(mp, tp, XFS_INO_TO_AGNO(mp, ip->i_ino), &agibp); if (error) return error; agi = XFS_BUF_TO_AGI(agibp); /* * Get the index into the agi hash table for the * list this inode will go on. */ agino = XFS_INO_TO_AGINO(mp, ip->i_ino); ASSERT(agino != 0); bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS; ASSERT(agi->agi_unlinked[bucket_index]); ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != agino); if (agi->agi_unlinked[bucket_index] != cpu_to_be32(NULLAGINO)) { /* * There is already another inode in the bucket we need * to add ourselves to. Add us at the front of the list. * Here we put the head pointer into our next pointer, * and then we fall through to point the head at us. */ error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp, 0, 0); if (error) return error; ASSERT(dip->di_next_unlinked == cpu_to_be32(NULLAGINO)); dip->di_next_unlinked = agi->agi_unlinked[bucket_index]; offset = ip->i_imap.im_boffset + offsetof(xfs_dinode_t, di_next_unlinked); xfs_trans_inode_buf(tp, ibp); xfs_trans_log_buf(tp, ibp, offset, (offset + sizeof(xfs_agino_t) - 1)); xfs_inobp_check(mp, ibp); } /* * Point the bucket head pointer at the inode being inserted. */ ASSERT(agino != 0); agi->agi_unlinked[bucket_index] = cpu_to_be32(agino); offset = offsetof(xfs_agi_t, agi_unlinked) + (sizeof(xfs_agino_t) * bucket_index); xfs_trans_log_buf(tp, agibp, offset, (offset + sizeof(xfs_agino_t) - 1)); return 0; } /* * Pull the on-disk inode from the AGI unlinked list. */ STATIC int xfs_iunlink_remove( xfs_trans_t *tp, xfs_inode_t *ip) { xfs_ino_t next_ino; xfs_mount_t *mp; xfs_agi_t *agi; xfs_dinode_t *dip; xfs_buf_t *agibp; xfs_buf_t *ibp; xfs_agnumber_t agno; xfs_agino_t agino; xfs_agino_t next_agino; xfs_buf_t *last_ibp; xfs_dinode_t *last_dip = NULL; short bucket_index; int offset, last_offset = 0; int error; mp = tp->t_mountp; agno = XFS_INO_TO_AGNO(mp, ip->i_ino); /* * Get the agi buffer first. It ensures lock ordering * on the list. */ error = xfs_read_agi(mp, tp, agno, &agibp); if (error) return error; agi = XFS_BUF_TO_AGI(agibp); /* * Get the index into the agi hash table for the * list this inode will go on. */ agino = XFS_INO_TO_AGINO(mp, ip->i_ino); ASSERT(agino != 0); bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS; ASSERT(agi->agi_unlinked[bucket_index] != cpu_to_be32(NULLAGINO)); ASSERT(agi->agi_unlinked[bucket_index]); if (be32_to_cpu(agi->agi_unlinked[bucket_index]) == agino) { /* * We're at the head of the list. Get the inode's on-disk * buffer to see if there is anyone after us on the list. * Only modify our next pointer if it is not already NULLAGINO. * This saves us the overhead of dealing with the buffer when * there is no need to change it. */ error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp, 0, 0); if (error) { xfs_warn(mp, "%s: xfs_imap_to_bp returned error %d.", __func__, error); return error; } next_agino = be32_to_cpu(dip->di_next_unlinked); ASSERT(next_agino != 0); if (next_agino != NULLAGINO) { dip->di_next_unlinked = cpu_to_be32(NULLAGINO); offset = ip->i_imap.im_boffset + offsetof(xfs_dinode_t, di_next_unlinked); xfs_trans_inode_buf(tp, ibp); xfs_trans_log_buf(tp, ibp, offset, (offset + sizeof(xfs_agino_t) - 1)); xfs_inobp_check(mp, ibp); } else { xfs_trans_brelse(tp, ibp); } /* * Point the bucket head pointer at the next inode. */ ASSERT(next_agino != 0); ASSERT(next_agino != agino); agi->agi_unlinked[bucket_index] = cpu_to_be32(next_agino); offset = offsetof(xfs_agi_t, agi_unlinked) + (sizeof(xfs_agino_t) * bucket_index); xfs_trans_log_buf(tp, agibp, offset, (offset + sizeof(xfs_agino_t) - 1)); } else { /* * We need to search the list for the inode being freed. */ next_agino = be32_to_cpu(agi->agi_unlinked[bucket_index]); last_ibp = NULL; while (next_agino != agino) { struct xfs_imap imap; if (last_ibp) xfs_trans_brelse(tp, last_ibp); imap.im_blkno = 0; next_ino = XFS_AGINO_TO_INO(mp, agno, next_agino); error = xfs_imap(mp, tp, next_ino, &imap, 0); if (error) { xfs_warn(mp, "%s: xfs_imap returned error %d.", __func__, error); return error; } error = xfs_imap_to_bp(mp, tp, &imap, &last_dip, &last_ibp, 0, 0); if (error) { xfs_warn(mp, "%s: xfs_imap_to_bp returned error %d.", __func__, error); return error; } last_offset = imap.im_boffset; next_agino = be32_to_cpu(last_dip->di_next_unlinked); ASSERT(next_agino != NULLAGINO); ASSERT(next_agino != 0); } /* * Now last_ibp points to the buffer previous to us on the * unlinked list. Pull us from the list. */ error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &ibp, 0, 0); if (error) { xfs_warn(mp, "%s: xfs_imap_to_bp(2) returned error %d.", __func__, error); return error; } next_agino = be32_to_cpu(dip->di_next_unlinked); ASSERT(next_agino != 0); ASSERT(next_agino != agino); if (next_agino != NULLAGINO) { dip->di_next_unlinked = cpu_to_be32(NULLAGINO); offset = ip->i_imap.im_boffset + offsetof(xfs_dinode_t, di_next_unlinked); xfs_trans_inode_buf(tp, ibp); xfs_trans_log_buf(tp, ibp, offset, (offset + sizeof(xfs_agino_t) - 1)); xfs_inobp_check(mp, ibp); } else { xfs_trans_brelse(tp, ibp); } /* * Point the previous inode on the list to the next inode. */ last_dip->di_next_unlinked = cpu_to_be32(next_agino); ASSERT(next_agino != 0); offset = last_offset + offsetof(xfs_dinode_t, di_next_unlinked); xfs_trans_inode_buf(tp, last_ibp); xfs_trans_log_buf(tp, last_ibp, offset, (offset + sizeof(xfs_agino_t) - 1)); xfs_inobp_check(mp, last_ibp); } return 0; } /* * A big issue when freeing the inode cluster is is that we _cannot_ skip any * inodes that are in memory - they all must be marked stale and attached to * the cluster buffer. */ STATIC int xfs_ifree_cluster( xfs_inode_t *free_ip, xfs_trans_t *tp, xfs_ino_t inum) { xfs_mount_t *mp = free_ip->i_mount; int blks_per_cluster; int nbufs; int ninodes; int i, j; xfs_daddr_t blkno; xfs_buf_t *bp; xfs_inode_t *ip; xfs_inode_log_item_t *iip; xfs_log_item_t *lip; struct xfs_perag *pag; pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, inum)); if (mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp)) { blks_per_cluster = 1; ninodes = mp->m_sb.sb_inopblock; nbufs = XFS_IALLOC_BLOCKS(mp); } else { blks_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) / mp->m_sb.sb_blocksize; ninodes = blks_per_cluster * mp->m_sb.sb_inopblock; nbufs = XFS_IALLOC_BLOCKS(mp) / blks_per_cluster; } for (j = 0; j < nbufs; j++, inum += ninodes) { blkno = XFS_AGB_TO_DADDR(mp, XFS_INO_TO_AGNO(mp, inum), XFS_INO_TO_AGBNO(mp, inum)); /* * We obtain and lock the backing buffer first in the process * here, as we have to ensure that any dirty inode that we * can't get the flush lock on is attached to the buffer. * If we scan the in-memory inodes first, then buffer IO can * complete before we get a lock on it, and hence we may fail * to mark all the active inodes on the buffer stale. */ bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, blkno, mp->m_bsize * blks_per_cluster, XBF_UNMAPPED); if (!bp) return ENOMEM; /* * Walk the inodes already attached to the buffer and mark them * stale. These will all have the flush locks held, so an * in-memory inode walk can't lock them. By marking them all * stale first, we will not attempt to lock them in the loop * below as the XFS_ISTALE flag will be set. */ lip = bp->b_fspriv; while (lip) { if (lip->li_type == XFS_LI_INODE) { iip = (xfs_inode_log_item_t *)lip; ASSERT(iip->ili_logged == 1); lip->li_cb = xfs_istale_done; xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn, &iip->ili_item.li_lsn); xfs_iflags_set(iip->ili_inode, XFS_ISTALE); } lip = lip->li_bio_list; } /* * For each inode in memory attempt to add it to the inode * buffer and set it up for being staled on buffer IO * completion. This is safe as we've locked out tail pushing * and flushing by locking the buffer. * * We have already marked every inode that was part of a * transaction stale above, which means there is no point in * even trying to lock them. */ for (i = 0; i < ninodes; i++) { retry: rcu_read_lock(); ip = radix_tree_lookup(&pag->pag_ici_root, XFS_INO_TO_AGINO(mp, (inum + i))); /* Inode not in memory, nothing to do */ if (!ip) { rcu_read_unlock(); continue; } /* * because this is an RCU protected lookup, we could * find a recently freed or even reallocated inode * during the lookup. We need to check under the * i_flags_lock for a valid inode here. Skip it if it * is not valid, the wrong inode or stale. */ spin_lock(&ip->i_flags_lock); if (ip->i_ino != inum + i || __xfs_iflags_test(ip, XFS_ISTALE)) { spin_unlock(&ip->i_flags_lock); rcu_read_unlock(); continue; } spin_unlock(&ip->i_flags_lock); /* * Don't try to lock/unlock the current inode, but we * _cannot_ skip the other inodes that we did not find * in the list attached to the buffer and are not * already marked stale. If we can't lock it, back off * and retry. */ if (ip != free_ip && !xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) { rcu_read_unlock(); delay(1); goto retry; } rcu_read_unlock(); xfs_iflock(ip); xfs_iflags_set(ip, XFS_ISTALE); /* * we don't need to attach clean inodes or those only * with unlogged changes (which we throw away, anyway). */ iip = ip->i_itemp; if (!iip || xfs_inode_clean(ip)) { ASSERT(ip != free_ip); xfs_ifunlock(ip); xfs_iunlock(ip, XFS_ILOCK_EXCL); continue; } iip->ili_last_fields = iip->ili_fields; iip->ili_fields = 0; iip->ili_logged = 1; xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn, &iip->ili_item.li_lsn); xfs_buf_attach_iodone(bp, xfs_istale_done, &iip->ili_item); if (ip != free_ip) xfs_iunlock(ip, XFS_ILOCK_EXCL); } xfs_trans_stale_inode_buf(tp, bp); xfs_trans_binval(tp, bp); } xfs_perag_put(pag); return 0; } /* * This is called to return an inode to the inode free list. * The inode should already be truncated to 0 length and have * no pages associated with it. This routine also assumes that * the inode is already a part of the transaction. * * The on-disk copy of the inode will have been added to the list * of unlinked inodes in the AGI. We need to remove the inode from * that list atomically with respect to freeing it here. */ int xfs_ifree( xfs_trans_t *tp, xfs_inode_t *ip, xfs_bmap_free_t *flist) { int error; int delete; xfs_ino_t first_ino; xfs_dinode_t *dip; xfs_buf_t *ibp; ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); ASSERT(ip->i_d.di_nlink == 0); ASSERT(ip->i_d.di_nextents == 0); ASSERT(ip->i_d.di_anextents == 0); ASSERT(ip->i_d.di_size == 0 || !S_ISREG(ip->i_d.di_mode)); ASSERT(ip->i_d.di_nblocks == 0); /* * Pull the on-disk inode from the AGI unlinked list. */ error = xfs_iunlink_remove(tp, ip); if (error != 0) { return error; } error = xfs_difree(tp, ip->i_ino, flist, &delete, &first_ino); if (error != 0) { return error; } ip->i_d.di_mode = 0; /* mark incore inode as free */ ip->i_d.di_flags = 0; ip->i_d.di_dmevmask = 0; ip->i_d.di_forkoff = 0; /* mark the attr fork not in use */ ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS; ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS; /* * Bump the generation count so no one will be confused * by reincarnations of this inode. */ ip->i_d.di_gen++; xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); error = xfs_imap_to_bp(ip->i_mount, tp, &ip->i_imap, &dip, &ibp, 0, 0); if (error) return error; /* * Clear the on-disk di_mode. This is to prevent xfs_bulkstat * from picking up this inode when it is reclaimed (its incore state * initialzed but not flushed to disk yet). The in-core di_mode is * already cleared and a corresponding transaction logged. * The hack here just synchronizes the in-core to on-disk * di_mode value in advance before the actual inode sync to disk. * This is OK because the inode is already unlinked and would never * change its di_mode again for this inode generation. * This is a temporary hack that would require a proper fix * in the future. */ dip->di_mode = 0; if (delete) { error = xfs_ifree_cluster(ip, tp, first_ino); } return error; } /* * Reallocate the space for if_broot based on the number of records * being added or deleted as indicated in rec_diff. Move the records * and pointers in if_broot to fit the new size. When shrinking this * will eliminate holes between the records and pointers created by * the caller. When growing this will create holes to be filled in * by the caller. * * The caller must not request to add more records than would fit in * the on-disk inode root. If the if_broot is currently NULL, then * if we adding records one will be allocated. The caller must also * not request that the number of records go below zero, although * it can go to zero. * * ip -- the inode whose if_broot area is changing * ext_diff -- the change in the number of records, positive or negative, * requested for the if_broot array. */ void xfs_iroot_realloc( xfs_inode_t *ip, int rec_diff, int whichfork) { struct xfs_mount *mp = ip->i_mount; int cur_max; xfs_ifork_t *ifp; struct xfs_btree_block *new_broot; int new_max; size_t new_size; char *np; char *op; /* * Handle the degenerate case quietly. */ if (rec_diff == 0) { return; } ifp = XFS_IFORK_PTR(ip, whichfork); if (rec_diff > 0) { /* * If there wasn't any memory allocated before, just * allocate it now and get out. */ if (ifp->if_broot_bytes == 0) { new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(rec_diff); ifp->if_broot = kmem_alloc(new_size, KM_SLEEP | KM_NOFS); ifp->if_broot_bytes = (int)new_size; return; } /* * If there is already an existing if_broot, then we need * to realloc() it and shift the pointers to their new * location. The records don't change location because * they are kept butted up against the btree block header. */ cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0); new_max = cur_max + rec_diff; new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(new_max); ifp->if_broot = kmem_realloc(ifp->if_broot, new_size, (size_t)XFS_BMAP_BROOT_SPACE_CALC(cur_max), /* old size */ KM_SLEEP | KM_NOFS); op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1, ifp->if_broot_bytes); np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1, (int)new_size); ifp->if_broot_bytes = (int)new_size; ASSERT(ifp->if_broot_bytes <= XFS_IFORK_SIZE(ip, whichfork) + XFS_BROOT_SIZE_ADJ); memmove(np, op, cur_max * (uint)sizeof(xfs_dfsbno_t)); return; } /* * rec_diff is less than 0. In this case, we are shrinking the * if_broot buffer. It must already exist. If we go to zero * records, just get rid of the root and clear the status bit. */ ASSERT((ifp->if_broot != NULL) && (ifp->if_broot_bytes > 0)); cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0); new_max = cur_max + rec_diff; ASSERT(new_max >= 0); if (new_max > 0) new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(new_max); else new_size = 0; if (new_size > 0) { new_broot = kmem_alloc(new_size, KM_SLEEP | KM_NOFS); /* * First copy over the btree block header. */ memcpy(new_broot, ifp->if_broot, XFS_BTREE_LBLOCK_LEN); } else { new_broot = NULL; ifp->if_flags &= ~XFS_IFBROOT; } /* * Only copy the records and pointers if there are any. */ if (new_max > 0) { /* * First copy the records. */ op = (char *)XFS_BMBT_REC_ADDR(mp, ifp->if_broot, 1); np = (char *)XFS_BMBT_REC_ADDR(mp, new_broot, 1); memcpy(np, op, new_max * (uint)sizeof(xfs_bmbt_rec_t)); /* * Then copy the pointers. */ op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1, ifp->if_broot_bytes); np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, new_broot, 1, (int)new_size); memcpy(np, op, new_max * (uint)sizeof(xfs_dfsbno_t)); } kmem_free(ifp->if_broot); ifp->if_broot = new_broot; ifp->if_broot_bytes = (int)new_size; ASSERT(ifp->if_broot_bytes <= XFS_IFORK_SIZE(ip, whichfork) + XFS_BROOT_SIZE_ADJ); return; } /* * This is called when the amount of space needed for if_data * is increased or decreased. The change in size is indicated by * the number of bytes that need to be added or deleted in the * byte_diff parameter. * * If the amount of space needed has decreased below the size of the * inline buffer, then switch to using the inline buffer. Otherwise, * use kmem_realloc() or kmem_alloc() to adjust the size of the buffer * to what is needed. * * ip -- the inode whose if_data area is changing * byte_diff -- the change in the number of bytes, positive or negative, * requested for the if_data array. */ void xfs_idata_realloc( xfs_inode_t *ip, int byte_diff, int whichfork) { xfs_ifork_t *ifp; int new_size; int real_size; if (byte_diff == 0) { return; } ifp = XFS_IFORK_PTR(ip, whichfork); new_size = (int)ifp->if_bytes + byte_diff; ASSERT(new_size >= 0); if (new_size == 0) { if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) { kmem_free(ifp->if_u1.if_data); } ifp->if_u1.if_data = NULL; real_size = 0; } else if (new_size <= sizeof(ifp->if_u2.if_inline_data)) { /* * If the valid extents/data can fit in if_inline_ext/data, * copy them from the malloc'd vector and free it. */ if (ifp->if_u1.if_data == NULL) { ifp->if_u1.if_data = ifp->if_u2.if_inline_data; } else if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) { ASSERT(ifp->if_real_bytes != 0); memcpy(ifp->if_u2.if_inline_data, ifp->if_u1.if_data, new_size); kmem_free(ifp->if_u1.if_data); ifp->if_u1.if_data = ifp->if_u2.if_inline_data; } real_size = 0; } else { /* * Stuck with malloc/realloc. * For inline data, the underlying buffer must be * a multiple of 4 bytes in size so that it can be * logged and stay on word boundaries. We enforce * that here. */ real_size = roundup(new_size, 4); if (ifp->if_u1.if_data == NULL) { ASSERT(ifp->if_real_bytes == 0); ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP | KM_NOFS); } else if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) { /* * Only do the realloc if the underlying size * is really changing. */ if (ifp->if_real_bytes != real_size) { ifp->if_u1.if_data = kmem_realloc(ifp->if_u1.if_data, real_size, ifp->if_real_bytes, KM_SLEEP | KM_NOFS); } } else { ASSERT(ifp->if_real_bytes == 0); ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP | KM_NOFS); memcpy(ifp->if_u1.if_data, ifp->if_u2.if_inline_data, ifp->if_bytes); } } ifp->if_real_bytes = real_size; ifp->if_bytes = new_size; ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork)); } void xfs_idestroy_fork( xfs_inode_t *ip, int whichfork) { xfs_ifork_t *ifp; ifp = XFS_IFORK_PTR(ip, whichfork); if (ifp->if_broot != NULL) { kmem_free(ifp->if_broot); ifp->if_broot = NULL; } /* * If the format is local, then we can't have an extents * array so just look for an inline data array. If we're * not local then we may or may not have an extents list, * so check and free it up if we do. */ if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) { if ((ifp->if_u1.if_data != ifp->if_u2.if_inline_data) && (ifp->if_u1.if_data != NULL)) { ASSERT(ifp->if_real_bytes != 0); kmem_free(ifp->if_u1.if_data); ifp->if_u1.if_data = NULL; ifp->if_real_bytes = 0; } } else if ((ifp->if_flags & XFS_IFEXTENTS) && ((ifp->if_flags & XFS_IFEXTIREC) || ((ifp->if_u1.if_extents != NULL) && (ifp->if_u1.if_extents != ifp->if_u2.if_inline_ext)))) { ASSERT(ifp->if_real_bytes != 0); xfs_iext_destroy(ifp); } ASSERT(ifp->if_u1.if_extents == NULL || ifp->if_u1.if_extents == ifp->if_u2.if_inline_ext); ASSERT(ifp->if_real_bytes == 0); if (whichfork == XFS_ATTR_FORK) { kmem_zone_free(xfs_ifork_zone, ip->i_afp); ip->i_afp = NULL; } } /* * This is called to unpin an inode. The caller must have the inode locked * in at least shared mode so that the buffer cannot be subsequently pinned * once someone is waiting for it to be unpinned. */ static void xfs_iunpin( struct xfs_inode *ip) { ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)); trace_xfs_inode_unpin_nowait(ip, _RET_IP_); /* Give the log a push to start the unpinning I/O */ xfs_log_force_lsn(ip->i_mount, ip->i_itemp->ili_last_lsn, 0); } static void __xfs_iunpin_wait( struct xfs_inode *ip) { wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IPINNED_BIT); DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IPINNED_BIT); xfs_iunpin(ip); do { prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); if (xfs_ipincount(ip)) io_schedule(); } while (xfs_ipincount(ip)); finish_wait(wq, &wait.wait); } void xfs_iunpin_wait( struct xfs_inode *ip) { if (xfs_ipincount(ip)) __xfs_iunpin_wait(ip); } /* * xfs_iextents_copy() * * This is called to copy the REAL extents (as opposed to the delayed * allocation extents) from the inode into the given buffer. It * returns the number of bytes copied into the buffer. * * If there are no delayed allocation extents, then we can just * memcpy() the extents into the buffer. Otherwise, we need to * examine each extent in turn and skip those which are delayed. */ int xfs_iextents_copy( xfs_inode_t *ip, xfs_bmbt_rec_t *dp, int whichfork) { int copied; int i; xfs_ifork_t *ifp; int nrecs; xfs_fsblock_t start_block; ifp = XFS_IFORK_PTR(ip, whichfork); ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)); ASSERT(ifp->if_bytes > 0); nrecs = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); XFS_BMAP_TRACE_EXLIST(ip, nrecs, whichfork); ASSERT(nrecs > 0); /* * There are some delayed allocation extents in the * inode, so copy the extents one at a time and skip * the delayed ones. There must be at least one * non-delayed extent. */ copied = 0; for (i = 0; i < nrecs; i++) { xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i); start_block = xfs_bmbt_get_startblock(ep); if (isnullstartblock(start_block)) { /* * It's a delayed allocation extent, so skip it. */ continue; } /* Translate to on disk format */ put_unaligned(cpu_to_be64(ep->l0), &dp->l0); put_unaligned(cpu_to_be64(ep->l1), &dp->l1); dp++; copied++; } ASSERT(copied != 0); xfs_validate_extents(ifp, copied, XFS_EXTFMT_INODE(ip)); return (copied * (uint)sizeof(xfs_bmbt_rec_t)); } /* * Each of the following cases stores data into the same region * of the on-disk inode, so only one of them can be valid at * any given time. While it is possible to have conflicting formats * and log flags, e.g. having XFS_ILOG_?DATA set when the fork is * in EXTENTS format, this can only happen when the fork has * changed formats after being modified but before being flushed. * In these cases, the format always takes precedence, because the * format indicates the current state of the fork. */ /*ARGSUSED*/ STATIC void xfs_iflush_fork( xfs_inode_t *ip, xfs_dinode_t *dip, xfs_inode_log_item_t *iip, int whichfork, xfs_buf_t *bp) { char *cp; xfs_ifork_t *ifp; xfs_mount_t *mp; #ifdef XFS_TRANS_DEBUG int first; #endif static const short brootflag[2] = { XFS_ILOG_DBROOT, XFS_ILOG_ABROOT }; static const short dataflag[2] = { XFS_ILOG_DDATA, XFS_ILOG_ADATA }; static const short extflag[2] = { XFS_ILOG_DEXT, XFS_ILOG_AEXT }; if (!iip) return; ifp = XFS_IFORK_PTR(ip, whichfork); /* * This can happen if we gave up in iformat in an error path, * for the attribute fork. */ if (!ifp) { ASSERT(whichfork == XFS_ATTR_FORK); return; } cp = XFS_DFORK_PTR(dip, whichfork); mp = ip->i_mount; switch (XFS_IFORK_FORMAT(ip, whichfork)) { case XFS_DINODE_FMT_LOCAL: if ((iip->ili_fields & dataflag[whichfork]) && (ifp->if_bytes > 0)) { ASSERT(ifp->if_u1.if_data != NULL); ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork)); memcpy(cp, ifp->if_u1.if_data, ifp->if_bytes); } break; case XFS_DINODE_FMT_EXTENTS: ASSERT((ifp->if_flags & XFS_IFEXTENTS) || !(iip->ili_fields & extflag[whichfork])); if ((iip->ili_fields & extflag[whichfork]) && (ifp->if_bytes > 0)) { ASSERT(xfs_iext_get_ext(ifp, 0)); ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) > 0); (void)xfs_iextents_copy(ip, (xfs_bmbt_rec_t *)cp, whichfork); } break; case XFS_DINODE_FMT_BTREE: if ((iip->ili_fields & brootflag[whichfork]) && (ifp->if_broot_bytes > 0)) { ASSERT(ifp->if_broot != NULL); ASSERT(ifp->if_broot_bytes <= (XFS_IFORK_SIZE(ip, whichfork) + XFS_BROOT_SIZE_ADJ)); xfs_bmbt_to_bmdr(mp, ifp->if_broot, ifp->if_broot_bytes, (xfs_bmdr_block_t *)cp, XFS_DFORK_SIZE(dip, mp, whichfork)); } break; case XFS_DINODE_FMT_DEV: if (iip->ili_fields & XFS_ILOG_DEV) { ASSERT(whichfork == XFS_DATA_FORK); xfs_dinode_put_rdev(dip, ip->i_df.if_u2.if_rdev); } break; case XFS_DINODE_FMT_UUID: if (iip->ili_fields & XFS_ILOG_UUID) { ASSERT(whichfork == XFS_DATA_FORK); memcpy(XFS_DFORK_DPTR(dip), &ip->i_df.if_u2.if_uuid, sizeof(uuid_t)); } break; default: ASSERT(0); break; } } STATIC int xfs_iflush_cluster( xfs_inode_t *ip, xfs_buf_t *bp) { xfs_mount_t *mp = ip->i_mount; struct xfs_perag *pag; unsigned long first_index, mask; unsigned long inodes_per_cluster; int ilist_size; xfs_inode_t **ilist; xfs_inode_t *iq; int nr_found; int clcount = 0; int bufwasdelwri; int i; pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino)); inodes_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog; ilist_size = inodes_per_cluster * sizeof(xfs_inode_t *); ilist = kmem_alloc(ilist_size, KM_MAYFAIL|KM_NOFS); if (!ilist) goto out_put; mask = ~(((XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog)) - 1); first_index = XFS_INO_TO_AGINO(mp, ip->i_ino) & mask; rcu_read_lock(); /* really need a gang lookup range call here */ nr_found = radix_tree_gang_lookup(&pag->pag_ici_root, (void**)ilist, first_index, inodes_per_cluster); if (nr_found == 0) goto out_free; for (i = 0; i < nr_found; i++) { iq = ilist[i]; if (iq == ip) continue; /* * because this is an RCU protected lookup, we could find a * recently freed or even reallocated inode during the lookup. * We need to check under the i_flags_lock for a valid inode * here. Skip it if it is not valid or the wrong inode. */ spin_lock(&ip->i_flags_lock); if (!ip->i_ino || (XFS_INO_TO_AGINO(mp, iq->i_ino) & mask) != first_index) { spin_unlock(&ip->i_flags_lock); continue; } spin_unlock(&ip->i_flags_lock); /* * Do an un-protected check to see if the inode is dirty and * is a candidate for flushing. These checks will be repeated * later after the appropriate locks are acquired. */ if (xfs_inode_clean(iq) && xfs_ipincount(iq) == 0) continue; /* * Try to get locks. If any are unavailable or it is pinned, * then this inode cannot be flushed and is skipped. */ if (!xfs_ilock_nowait(iq, XFS_ILOCK_SHARED)) continue; if (!xfs_iflock_nowait(iq)) { xfs_iunlock(iq, XFS_ILOCK_SHARED); continue; } if (xfs_ipincount(iq)) { xfs_ifunlock(iq); xfs_iunlock(iq, XFS_ILOCK_SHARED); continue; } /* * arriving here means that this inode can be flushed. First * re-check that it's dirty before flushing. */ if (!xfs_inode_clean(iq)) { int error; error = xfs_iflush_int(iq, bp); if (error) { xfs_iunlock(iq, XFS_ILOCK_SHARED); goto cluster_corrupt_out; } clcount++; } else { xfs_ifunlock(iq); } xfs_iunlock(iq, XFS_ILOCK_SHARED); } if (clcount) { XFS_STATS_INC(xs_icluster_flushcnt); XFS_STATS_ADD(xs_icluster_flushinode, clcount); } out_free: rcu_read_unlock(); kmem_free(ilist); out_put: xfs_perag_put(pag); return 0; cluster_corrupt_out: /* * Corruption detected in the clustering loop. Invalidate the * inode buffer and shut down the filesystem. */ rcu_read_unlock(); /* * Clean up the buffer. If it was delwri, just release it -- * brelse can handle it with no problems. If not, shut down the * filesystem before releasing the buffer. */ bufwasdelwri = (bp->b_flags & _XBF_DELWRI_Q); if (bufwasdelwri) xfs_buf_relse(bp); xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); if (!bufwasdelwri) { /* * Just like incore_relse: if we have b_iodone functions, * mark the buffer as an error and call them. Otherwise * mark it as stale and brelse. */ if (bp->b_iodone) { XFS_BUF_UNDONE(bp); xfs_buf_stale(bp); xfs_buf_ioerror(bp, EIO); xfs_buf_ioend(bp, 0); } else { xfs_buf_stale(bp); xfs_buf_relse(bp); } } /* * Unlocks the flush lock */ xfs_iflush_abort(iq, false); kmem_free(ilist); xfs_perag_put(pag); return XFS_ERROR(EFSCORRUPTED); } /* * Flush dirty inode metadata into the backing buffer. * * The caller must have the inode lock and the inode flush lock held. The * inode lock will still be held upon return to the caller, and the inode * flush lock will be released after the inode has reached the disk. * * The caller must write out the buffer returned in *bpp and release it. */ int xfs_iflush( struct xfs_inode *ip, struct xfs_buf **bpp) { struct xfs_mount *mp = ip->i_mount; struct xfs_buf *bp; struct xfs_dinode *dip; int error; XFS_STATS_INC(xs_iflush_count); ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)); ASSERT(xfs_isiflocked(ip)); ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK)); *bpp = NULL; xfs_iunpin_wait(ip); /* * For stale inodes we cannot rely on the backing buffer remaining * stale in cache for the remaining life of the stale inode and so * xfs_imap_to_bp() below may give us a buffer that no longer contains * inodes below. We have to check this after ensuring the inode is * unpinned so that it is safe to reclaim the stale inode after the * flush call. */ if (xfs_iflags_test(ip, XFS_ISTALE)) { xfs_ifunlock(ip); return 0; } /* * This may have been unpinned because the filesystem is shutting * down forcibly. If that's the case we must not write this inode * to disk, because the log record didn't make it to disk. * * We also have to remove the log item from the AIL in this case, * as we wait for an empty AIL as part of the unmount process. */ if (XFS_FORCED_SHUTDOWN(mp)) { error = XFS_ERROR(EIO); goto abort_out; } /* * Get the buffer containing the on-disk inode. */ error = xfs_imap_to_bp(mp, NULL, &ip->i_imap, &dip, &bp, XBF_TRYLOCK, 0); if (error || !bp) { xfs_ifunlock(ip); return error; } /* * First flush out the inode that xfs_iflush was called with. */ error = xfs_iflush_int(ip, bp); if (error) goto corrupt_out; /* * If the buffer is pinned then push on the log now so we won't * get stuck waiting in the write for too long. */ if (xfs_buf_ispinned(bp)) xfs_log_force(mp, 0); /* * inode clustering: * see if other inodes can be gathered into this write */ error = xfs_iflush_cluster(ip, bp); if (error) goto cluster_corrupt_out; *bpp = bp; return 0; corrupt_out: xfs_buf_relse(bp); xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE); cluster_corrupt_out: error = XFS_ERROR(EFSCORRUPTED); abort_out: /* * Unlocks the flush lock */ xfs_iflush_abort(ip, false); return error; } STATIC int xfs_iflush_int( xfs_inode_t *ip, xfs_buf_t *bp) { xfs_inode_log_item_t *iip; xfs_dinode_t *dip; xfs_mount_t *mp; #ifdef XFS_TRANS_DEBUG int first; #endif ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)); ASSERT(xfs_isiflocked(ip)); ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || ip->i_d.di_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK)); iip = ip->i_itemp; mp = ip->i_mount; /* set *dip = inode's place in the buffer */ dip = (xfs_dinode_t *)xfs_buf_offset(bp, ip->i_imap.im_boffset); if (XFS_TEST_ERROR(dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC), mp, XFS_ERRTAG_IFLUSH_1, XFS_RANDOM_IFLUSH_1)) { xfs_alert_tag(mp, XFS_PTAG_IFLUSH, "%s: Bad inode %Lu magic number 0x%x, ptr 0x%p", __func__, ip->i_ino, be16_to_cpu(dip->di_magic), dip); goto corrupt_out; } if (XFS_TEST_ERROR(ip->i_d.di_magic != XFS_DINODE_MAGIC, mp, XFS_ERRTAG_IFLUSH_2, XFS_RANDOM_IFLUSH_2)) { xfs_alert_tag(mp, XFS_PTAG_IFLUSH, "%s: Bad inode %Lu, ptr 0x%p, magic number 0x%x", __func__, ip->i_ino, ip, ip->i_d.di_magic); goto corrupt_out; } if (S_ISREG(ip->i_d.di_mode)) { if (XFS_TEST_ERROR( (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) && (ip->i_d.di_format != XFS_DINODE_FMT_BTREE), mp, XFS_ERRTAG_IFLUSH_3, XFS_RANDOM_IFLUSH_3)) { xfs_alert_tag(mp, XFS_PTAG_IFLUSH, "%s: Bad regular inode %Lu, ptr 0x%p", __func__, ip->i_ino, ip); goto corrupt_out; } } else if (S_ISDIR(ip->i_d.di_mode)) { if (XFS_TEST_ERROR( (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) && (ip->i_d.di_format != XFS_DINODE_FMT_BTREE) && (ip->i_d.di_format != XFS_DINODE_FMT_LOCAL), mp, XFS_ERRTAG_IFLUSH_4, XFS_RANDOM_IFLUSH_4)) { xfs_alert_tag(mp, XFS_PTAG_IFLUSH, "%s: Bad directory inode %Lu, ptr 0x%p", __func__, ip->i_ino, ip); goto corrupt_out; } } if (XFS_TEST_ERROR(ip->i_d.di_nextents + ip->i_d.di_anextents > ip->i_d.di_nblocks, mp, XFS_ERRTAG_IFLUSH_5, XFS_RANDOM_IFLUSH_5)) { xfs_alert_tag(mp, XFS_PTAG_IFLUSH, "%s: detected corrupt incore inode %Lu, " "total extents = %d, nblocks = %Ld, ptr 0x%p", __func__, ip->i_ino, ip->i_d.di_nextents + ip->i_d.di_anextents, ip->i_d.di_nblocks, ip); goto corrupt_out; } if (XFS_TEST_ERROR(ip->i_d.di_forkoff > mp->m_sb.sb_inodesize, mp, XFS_ERRTAG_IFLUSH_6, XFS_RANDOM_IFLUSH_6)) { xfs_alert_tag(mp, XFS_PTAG_IFLUSH, "%s: bad inode %Lu, forkoff 0x%x, ptr 0x%p", __func__, ip->i_ino, ip->i_d.di_forkoff, ip); goto corrupt_out; } /* * bump the flush iteration count, used to detect flushes which * postdate a log record during recovery. */ ip->i_d.di_flushiter++; /* * Copy the dirty parts of the inode into the on-disk * inode. We always copy out the core of the inode, * because if the inode is dirty at all the core must * be. */ xfs_dinode_to_disk(dip, &ip->i_d); /* Wrap, we never let the log put out DI_MAX_FLUSH */ if (ip->i_d.di_flushiter == DI_MAX_FLUSH) ip->i_d.di_flushiter = 0; /* * If this is really an old format inode and the superblock version * has not been updated to support only new format inodes, then * convert back to the old inode format. If the superblock version * has been updated, then make the conversion permanent. */ ASSERT(ip->i_d.di_version == 1 || xfs_sb_version_hasnlink(&mp->m_sb)); if (ip->i_d.di_version == 1) { if (!xfs_sb_version_hasnlink(&mp->m_sb)) { /* * Convert it back. */ ASSERT(ip->i_d.di_nlink <= XFS_MAXLINK_1); dip->di_onlink = cpu_to_be16(ip->i_d.di_nlink); } else { /* * The superblock version has already been bumped, * so just make the conversion to the new inode * format permanent. */ ip->i_d.di_version = 2; dip->di_version = 2; ip->i_d.di_onlink = 0; dip->di_onlink = 0; memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad)); memset(&(dip->di_pad[0]), 0, sizeof(dip->di_pad)); ASSERT(xfs_get_projid(ip) == 0); } } xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK, bp); if (XFS_IFORK_Q(ip)) xfs_iflush_fork(ip, dip, iip, XFS_ATTR_FORK, bp); xfs_inobp_check(mp, bp); /* * We've recorded everything logged in the inode, so we'd like to clear * the ili_fields bits so we don't log and flush things unnecessarily. * However, we can't stop logging all this information until the data * we've copied into the disk buffer is written to disk. If we did we * might overwrite the copy of the inode in the log with all the data * after re-logging only part of it, and in the face of a crash we * wouldn't have all the data we need to recover. * * What we do is move the bits to the ili_last_fields field. When * logging the inode, these bits are moved back to the ili_fields field. * In the xfs_iflush_done() routine we clear ili_last_fields, since we * know that the information those bits represent is permanently on * disk. As long as the flush completes before the inode is logged * again, then both ili_fields and ili_last_fields will be cleared. * * We can play with the ili_fields bits here, because the inode lock * must be held exclusively in order to set bits there and the flush * lock protects the ili_last_fields bits. Set ili_logged so the flush * done routine can tell whether or not to look in the AIL. Also, store * the current LSN of the inode so that we can tell whether the item has * moved in the AIL from xfs_iflush_done(). In order to read the lsn we * need the AIL lock, because it is a 64 bit value that cannot be read * atomically. */ if (iip != NULL && iip->ili_fields != 0) { iip->ili_last_fields = iip->ili_fields; iip->ili_fields = 0; iip->ili_logged = 1; xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn, &iip->ili_item.li_lsn); /* * Attach the function xfs_iflush_done to the inode's * buffer. This will remove the inode from the AIL * and unlock the inode's flush lock when the inode is * completely written to disk. */ xfs_buf_attach_iodone(bp, xfs_iflush_done, &iip->ili_item); ASSERT(bp->b_fspriv != NULL); ASSERT(bp->b_iodone != NULL); } else { /* * We're flushing an inode which is not in the AIL and has * not been logged. For this case we can immediately drop * the inode flush lock because we can avoid the whole * AIL state thing. It's OK to drop the flush lock now, * because we've already locked the buffer and to do anything * you really need both. */ if (iip != NULL) { ASSERT(iip->ili_logged == 0); ASSERT(iip->ili_last_fields == 0); ASSERT((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0); } xfs_ifunlock(ip); } return 0; corrupt_out: return XFS_ERROR(EFSCORRUPTED); } /* * Return a pointer to the extent record at file index idx. */ xfs_bmbt_rec_host_t * xfs_iext_get_ext( xfs_ifork_t *ifp, /* inode fork pointer */ xfs_extnum_t idx) /* index of target extent */ { ASSERT(idx >= 0); ASSERT(idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t)); if ((ifp->if_flags & XFS_IFEXTIREC) && (idx == 0)) { return ifp->if_u1.if_ext_irec->er_extbuf; } else if (ifp->if_flags & XFS_IFEXTIREC) { xfs_ext_irec_t *erp; /* irec pointer */ int erp_idx = 0; /* irec index */ xfs_extnum_t page_idx = idx; /* ext index in target list */ erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 0); return &erp->er_extbuf[page_idx]; } else if (ifp->if_bytes) { return &ifp->if_u1.if_extents[idx]; } else { return NULL; } } /* * Insert new item(s) into the extent records for incore inode * fork 'ifp'. 'count' new items are inserted at index 'idx'. */ void xfs_iext_insert( xfs_inode_t *ip, /* incore inode pointer */ xfs_extnum_t idx, /* starting index of new items */ xfs_extnum_t count, /* number of inserted items */ xfs_bmbt_irec_t *new, /* items to insert */ int state) /* type of extent conversion */ { xfs_ifork_t *ifp = (state & BMAP_ATTRFORK) ? ip->i_afp : &ip->i_df; xfs_extnum_t i; /* extent record index */ trace_xfs_iext_insert(ip, idx, new, state, _RET_IP_); ASSERT(ifp->if_flags & XFS_IFEXTENTS); xfs_iext_add(ifp, idx, count); for (i = idx; i < idx + count; i++, new++) xfs_bmbt_set_all(xfs_iext_get_ext(ifp, i), new); } /* * This is called when the amount of space required for incore file * extents needs to be increased. The ext_diff parameter stores the * number of new extents being added and the idx parameter contains * the extent index where the new extents will be added. If the new * extents are being appended, then we just need to (re)allocate and * initialize the space. Otherwise, if the new extents are being * inserted into the middle of the existing entries, a bit more work * is required to make room for the new extents to be inserted. The * caller is responsible for filling in the new extent entries upon * return. */ void xfs_iext_add( xfs_ifork_t *ifp, /* inode fork pointer */ xfs_extnum_t idx, /* index to begin adding exts */ int ext_diff) /* number of extents to add */ { int byte_diff; /* new bytes being added */ int new_size; /* size of extents after adding */ xfs_extnum_t nextents; /* number of extents in file */ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); ASSERT((idx >= 0) && (idx <= nextents)); byte_diff = ext_diff * sizeof(xfs_bmbt_rec_t); new_size = ifp->if_bytes + byte_diff; /* * If the new number of extents (nextents + ext_diff) * fits inside the inode, then continue to use the inline * extent buffer. */ if (nextents + ext_diff <= XFS_INLINE_EXTS) { if (idx < nextents) { memmove(&ifp->if_u2.if_inline_ext[idx + ext_diff], &ifp->if_u2.if_inline_ext[idx], (nextents - idx) * sizeof(xfs_bmbt_rec_t)); memset(&ifp->if_u2.if_inline_ext[idx], 0, byte_diff); } ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext; ifp->if_real_bytes = 0; } /* * Otherwise use a linear (direct) extent list. * If the extents are currently inside the inode, * xfs_iext_realloc_direct will switch us from * inline to direct extent allocation mode. */ else if (nextents + ext_diff <= XFS_LINEAR_EXTS) { xfs_iext_realloc_direct(ifp, new_size); if (idx < nextents) { memmove(&ifp->if_u1.if_extents[idx + ext_diff], &ifp->if_u1.if_extents[idx], (nextents - idx) * sizeof(xfs_bmbt_rec_t)); memset(&ifp->if_u1.if_extents[idx], 0, byte_diff); } } /* Indirection array */ else { xfs_ext_irec_t *erp; int erp_idx = 0; int page_idx = idx; ASSERT(nextents + ext_diff > XFS_LINEAR_EXTS); if (ifp->if_flags & XFS_IFEXTIREC) { erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 1); } else { xfs_iext_irec_init(ifp); ASSERT(ifp->if_flags & XFS_IFEXTIREC); erp = ifp->if_u1.if_ext_irec; } /* Extents fit in target extent page */ if (erp && erp->er_extcount + ext_diff <= XFS_LINEAR_EXTS) { if (page_idx < erp->er_extcount) { memmove(&erp->er_extbuf[page_idx + ext_diff], &erp->er_extbuf[page_idx], (erp->er_extcount - page_idx) * sizeof(xfs_bmbt_rec_t)); memset(&erp->er_extbuf[page_idx], 0, byte_diff); } erp->er_extcount += ext_diff; xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff); } /* Insert a new extent page */ else if (erp) { xfs_iext_add_indirect_multi(ifp, erp_idx, page_idx, ext_diff); } /* * If extent(s) are being appended to the last page in * the indirection array and the new extent(s) don't fit * in the page, then erp is NULL and erp_idx is set to * the next index needed in the indirection array. */ else { int count = ext_diff; while (count) { erp = xfs_iext_irec_new(ifp, erp_idx); erp->er_extcount = count; count -= MIN(count, (int)XFS_LINEAR_EXTS); if (count) { erp_idx++; } } } } ifp->if_bytes = new_size; } /* * This is called when incore extents are being added to the indirection * array and the new extents do not fit in the target extent list. The * erp_idx parameter contains the irec index for the target extent list * in the indirection array, and the idx parameter contains the extent * index within the list. The number of extents being added is stored * in the count parameter. * * |-------| |-------| * | | | | idx - number of extents before idx * | idx | | count | * | | | | count - number of extents being inserted at idx * |-------| |-------| * | count | | nex2 | nex2 - number of extents after idx + count * |-------| |-------| */ void xfs_iext_add_indirect_multi( xfs_ifork_t *ifp, /* inode fork pointer */ int erp_idx, /* target extent irec index */ xfs_extnum_t idx, /* index within target list */ int count) /* new extents being added */ { int byte_diff; /* new bytes being added */ xfs_ext_irec_t *erp; /* pointer to irec entry */ xfs_extnum_t ext_diff; /* number of extents to add */ xfs_extnum_t ext_cnt; /* new extents still needed */ xfs_extnum_t nex2; /* extents after idx + count */ xfs_bmbt_rec_t *nex2_ep = NULL; /* temp list for nex2 extents */ int nlists; /* number of irec's (lists) */ ASSERT(ifp->if_flags & XFS_IFEXTIREC); erp = &ifp->if_u1.if_ext_irec[erp_idx]; nex2 = erp->er_extcount - idx; nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; /* * Save second part of target extent list * (all extents past */ if (nex2) { byte_diff = nex2 * sizeof(xfs_bmbt_rec_t); nex2_ep = (xfs_bmbt_rec_t *) kmem_alloc(byte_diff, KM_NOFS); memmove(nex2_ep, &erp->er_extbuf[idx], byte_diff); erp->er_extcount -= nex2; xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, -nex2); memset(&erp->er_extbuf[idx], 0, byte_diff); } /* * Add the new extents to the end of the target * list, then allocate new irec record(s) and * extent buffer(s) as needed to store the rest * of the new extents. */ ext_cnt = count; ext_diff = MIN(ext_cnt, (int)XFS_LINEAR_EXTS - erp->er_extcount); if (ext_diff) { erp->er_extcount += ext_diff; xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff); ext_cnt -= ext_diff; } while (ext_cnt) { erp_idx++; erp = xfs_iext_irec_new(ifp, erp_idx); ext_diff = MIN(ext_cnt, (int)XFS_LINEAR_EXTS); erp->er_extcount = ext_diff; xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff); ext_cnt -= ext_diff; } /* Add nex2 extents back to indirection array */ if (nex2) { xfs_extnum_t ext_avail; int i; byte_diff = nex2 * sizeof(xfs_bmbt_rec_t); ext_avail = XFS_LINEAR_EXTS - erp->er_extcount; i = 0; /* * If nex2 extents fit in the current page, append * nex2_ep after the new extents. */ if (nex2 <= ext_avail) { i = erp->er_extcount; } /* * Otherwise, check if space is available in the * next page. */ else if ((erp_idx < nlists - 1) && (nex2 <= (ext_avail = XFS_LINEAR_EXTS - ifp->if_u1.if_ext_irec[erp_idx+1].er_extcount))) { erp_idx++; erp++; /* Create a hole for nex2 extents */ memmove(&erp->er_extbuf[nex2], erp->er_extbuf, erp->er_extcount * sizeof(xfs_bmbt_rec_t)); } /* * Final choice, create a new extent page for * nex2 extents. */ else { erp_idx++; erp = xfs_iext_irec_new(ifp, erp_idx); } memmove(&erp->er_extbuf[i], nex2_ep, byte_diff); kmem_free(nex2_ep); erp->er_extcount += nex2; xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, nex2); } } /* * This is called when the amount of space required for incore file * extents needs to be decreased. The ext_diff parameter stores the * number of extents to be removed and the idx parameter contains * the extent index where the extents will be removed from. * * If the amount of space needed has decreased below the linear * limit, XFS_IEXT_BUFSZ, then switch to using the contiguous * extent array. Otherwise, use kmem_realloc() to adjust the * size to what is needed. */ void xfs_iext_remove( xfs_inode_t *ip, /* incore inode pointer */ xfs_extnum_t idx, /* index to begin removing exts */ int ext_diff, /* number of extents to remove */ int state) /* type of extent conversion */ { xfs_ifork_t *ifp = (state & BMAP_ATTRFORK) ? ip->i_afp : &ip->i_df; xfs_extnum_t nextents; /* number of extents in file */ int new_size; /* size of extents after removal */ trace_xfs_iext_remove(ip, idx, state, _RET_IP_); ASSERT(ext_diff > 0); nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); new_size = (nextents - ext_diff) * sizeof(xfs_bmbt_rec_t); if (new_size == 0) { xfs_iext_destroy(ifp); } else if (ifp->if_flags & XFS_IFEXTIREC) { xfs_iext_remove_indirect(ifp, idx, ext_diff); } else if (ifp->if_real_bytes) { xfs_iext_remove_direct(ifp, idx, ext_diff); } else { xfs_iext_remove_inline(ifp, idx, ext_diff); } ifp->if_bytes = new_size; } /* * This removes ext_diff extents from the inline buffer, beginning * at extent index idx. */ void xfs_iext_remove_inline( xfs_ifork_t *ifp, /* inode fork pointer */ xfs_extnum_t idx, /* index to begin removing exts */ int ext_diff) /* number of extents to remove */ { int nextents; /* number of extents in file */ ASSERT(!(ifp->if_flags & XFS_IFEXTIREC)); ASSERT(idx < XFS_INLINE_EXTS); nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); ASSERT(((nextents - ext_diff) > 0) && (nextents - ext_diff) < XFS_INLINE_EXTS); if (idx + ext_diff < nextents) { memmove(&ifp->if_u2.if_inline_ext[idx], &ifp->if_u2.if_inline_ext[idx + ext_diff], (nextents - (idx + ext_diff)) * sizeof(xfs_bmbt_rec_t)); memset(&ifp->if_u2.if_inline_ext[nextents - ext_diff], 0, ext_diff * sizeof(xfs_bmbt_rec_t)); } else { memset(&ifp->if_u2.if_inline_ext[idx], 0, ext_diff * sizeof(xfs_bmbt_rec_t)); } } /* * This removes ext_diff extents from a linear (direct) extent list, * beginning at extent index idx. If the extents are being removed * from the end of the list (ie. truncate) then we just need to re- * allocate the list to remove the extra space. Otherwise, if the * extents are being removed from the middle of the existing extent * entries, then we first need to move the extent records beginning * at idx + ext_diff up in the list to overwrite the records being * removed, then remove the extra space via kmem_realloc. */ void xfs_iext_remove_direct( xfs_ifork_t *ifp, /* inode fork pointer */ xfs_extnum_t idx, /* index to begin removing exts */ int ext_diff) /* number of extents to remove */ { xfs_extnum_t nextents; /* number of extents in file */ int new_size; /* size of extents after removal */ ASSERT(!(ifp->if_flags & XFS_IFEXTIREC)); new_size = ifp->if_bytes - (ext_diff * sizeof(xfs_bmbt_rec_t)); nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); if (new_size == 0) { xfs_iext_destroy(ifp); return; } /* Move extents up in the list (if needed) */ if (idx + ext_diff < nextents) { memmove(&ifp->if_u1.if_extents[idx], &ifp->if_u1.if_extents[idx + ext_diff], (nextents - (idx + ext_diff)) * sizeof(xfs_bmbt_rec_t)); } memset(&ifp->if_u1.if_extents[nextents - ext_diff], 0, ext_diff * sizeof(xfs_bmbt_rec_t)); /* * Reallocate the direct extent list. If the extents * will fit inside the inode then xfs_iext_realloc_direct * will switch from direct to inline extent allocation * mode for us. */ xfs_iext_realloc_direct(ifp, new_size); ifp->if_bytes = new_size; } /* * This is called when incore extents are being removed from the * indirection array and the extents being removed span multiple extent * buffers. The idx parameter contains the file extent index where we * want to begin removing extents, and the count parameter contains * how many extents need to be removed. * * |-------| |-------| * | nex1 | | | nex1 - number of extents before idx * |-------| | count | * | | | | count - number of extents being removed at idx * | count | |-------| * | | | nex2 | nex2 - number of extents after idx + count * |-------| |-------| */ void xfs_iext_remove_indirect( xfs_ifork_t *ifp, /* inode fork pointer */ xfs_extnum_t idx, /* index to begin removing extents */ int count) /* number of extents to remove */ { xfs_ext_irec_t *erp; /* indirection array pointer */ int erp_idx = 0; /* indirection array index */ xfs_extnum_t ext_cnt; /* extents left to remove */ xfs_extnum_t ext_diff; /* extents to remove in current list */ xfs_extnum_t nex1; /* number of extents before idx */ xfs_extnum_t nex2; /* extents after idx + count */ int page_idx = idx; /* index in target extent list */ ASSERT(ifp->if_flags & XFS_IFEXTIREC); erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 0); ASSERT(erp != NULL); nex1 = page_idx; ext_cnt = count; while (ext_cnt) { nex2 = MAX((erp->er_extcount - (nex1 + ext_cnt)), 0); ext_diff = MIN(ext_cnt, (erp->er_extcount - nex1)); /* * Check for deletion of entire list; * xfs_iext_irec_remove() updates extent offsets. */ if (ext_diff == erp->er_extcount) { xfs_iext_irec_remove(ifp, erp_idx); ext_cnt -= ext_diff; nex1 = 0; if (ext_cnt) { ASSERT(erp_idx < ifp->if_real_bytes / XFS_IEXT_BUFSZ); erp = &ifp->if_u1.if_ext_irec[erp_idx]; nex1 = 0; continue; } else { break; } } /* Move extents up (if needed) */ if (nex2) { memmove(&erp->er_extbuf[nex1], &erp->er_extbuf[nex1 + ext_diff], nex2 * sizeof(xfs_bmbt_rec_t)); } /* Zero out rest of page */ memset(&erp->er_extbuf[nex1 + nex2], 0, (XFS_IEXT_BUFSZ - ((nex1 + nex2) * sizeof(xfs_bmbt_rec_t)))); /* Update remaining counters */ erp->er_extcount -= ext_diff; xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, -ext_diff); ext_cnt -= ext_diff; nex1 = 0; erp_idx++; erp++; } ifp->if_bytes -= count * sizeof(xfs_bmbt_rec_t); xfs_iext_irec_compact(ifp); } /* * Create, destroy, or resize a linear (direct) block of extents. */ void xfs_iext_realloc_direct( xfs_ifork_t *ifp, /* inode fork pointer */ int new_size) /* new size of extents */ { int rnew_size; /* real new size of extents */ rnew_size = new_size; ASSERT(!(ifp->if_flags & XFS_IFEXTIREC) || ((new_size >= 0) && (new_size <= XFS_IEXT_BUFSZ) && (new_size != ifp->if_real_bytes))); /* Free extent records */ if (new_size == 0) { xfs_iext_destroy(ifp); } /* Resize direct extent list and zero any new bytes */ else if (ifp->if_real_bytes) { /* Check if extents will fit inside the inode */ if (new_size <= XFS_INLINE_EXTS * sizeof(xfs_bmbt_rec_t)) { xfs_iext_direct_to_inline(ifp, new_size / (uint)sizeof(xfs_bmbt_rec_t)); ifp->if_bytes = new_size; return; } if (!is_power_of_2(new_size)){ rnew_size = roundup_pow_of_two(new_size); } if (rnew_size != ifp->if_real_bytes) { ifp->if_u1.if_extents = kmem_realloc(ifp->if_u1.if_extents, rnew_size, ifp->if_real_bytes, KM_NOFS); } if (rnew_size > ifp->if_real_bytes) { memset(&ifp->if_u1.if_extents[ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t)], 0, rnew_size - ifp->if_real_bytes); } } /* * Switch from the inline extent buffer to a direct * extent list. Be sure to include the inline extent * bytes in new_size. */ else { new_size += ifp->if_bytes; if (!is_power_of_2(new_size)) { rnew_size = roundup_pow_of_two(new_size); } xfs_iext_inline_to_direct(ifp, rnew_size); } ifp->if_real_bytes = rnew_size; ifp->if_bytes = new_size; } /* * Switch from linear (direct) extent records to inline buffer. */ void xfs_iext_direct_to_inline( xfs_ifork_t *ifp, /* inode fork pointer */ xfs_extnum_t nextents) /* number of extents in file */ { ASSERT(ifp->if_flags & XFS_IFEXTENTS); ASSERT(nextents <= XFS_INLINE_EXTS); /* * The inline buffer was zeroed when we switched * from inline to direct extent allocation mode, * so we don't need to clear it here. */ memcpy(ifp->if_u2.if_inline_ext, ifp->if_u1.if_extents, nextents * sizeof(xfs_bmbt_rec_t)); kmem_free(ifp->if_u1.if_extents); ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext; ifp->if_real_bytes = 0; } /* * Switch from inline buffer to linear (direct) extent records. * new_size should already be rounded up to the next power of 2 * by the caller (when appropriate), so use new_size as it is. * However, since new_size may be rounded up, we can't update * if_bytes here. It is the caller's responsibility to update * if_bytes upon return. */ void xfs_iext_inline_to_direct( xfs_ifork_t *ifp, /* inode fork pointer */ int new_size) /* number of extents in file */ { ifp->if_u1.if_extents = kmem_alloc(new_size, KM_NOFS); memset(ifp->if_u1.if_extents, 0, new_size); if (ifp->if_bytes) { memcpy(ifp->if_u1.if_extents, ifp->if_u2.if_inline_ext, ifp->if_bytes); memset(ifp->if_u2.if_inline_ext, 0, XFS_INLINE_EXTS * sizeof(xfs_bmbt_rec_t)); } ifp->if_real_bytes = new_size; } /* * Resize an extent indirection array to new_size bytes. */ STATIC void xfs_iext_realloc_indirect( xfs_ifork_t *ifp, /* inode fork pointer */ int new_size) /* new indirection array size */ { int nlists; /* number of irec's (ex lists) */ int size; /* current indirection array size */ ASSERT(ifp->if_flags & XFS_IFEXTIREC); nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; size = nlists * sizeof(xfs_ext_irec_t); ASSERT(ifp->if_real_bytes); ASSERT((new_size >= 0) && (new_size != size)); if (new_size == 0) { xfs_iext_destroy(ifp); } else { ifp->if_u1.if_ext_irec = (xfs_ext_irec_t *) kmem_realloc(ifp->if_u1.if_ext_irec, new_size, size, KM_NOFS); } } /* * Switch from indirection array to linear (direct) extent allocations. */ STATIC void xfs_iext_indirect_to_direct( xfs_ifork_t *ifp) /* inode fork pointer */ { xfs_bmbt_rec_host_t *ep; /* extent record pointer */ xfs_extnum_t nextents; /* number of extents in file */ int size; /* size of file extents */ ASSERT(ifp->if_flags & XFS_IFEXTIREC); nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); ASSERT(nextents <= XFS_LINEAR_EXTS); size = nextents * sizeof(xfs_bmbt_rec_t); xfs_iext_irec_compact_pages(ifp); ASSERT(ifp->if_real_bytes == XFS_IEXT_BUFSZ); ep = ifp->if_u1.if_ext_irec->er_extbuf; kmem_free(ifp->if_u1.if_ext_irec); ifp->if_flags &= ~XFS_IFEXTIREC; ifp->if_u1.if_extents = ep; ifp->if_bytes = size; if (nextents < XFS_LINEAR_EXTS) { xfs_iext_realloc_direct(ifp, size); } } /* * Free incore file extents. */ void xfs_iext_destroy( xfs_ifork_t *ifp) /* inode fork pointer */ { if (ifp->if_flags & XFS_IFEXTIREC) { int erp_idx; int nlists; nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; for (erp_idx = nlists - 1; erp_idx >= 0 ; erp_idx--) { xfs_iext_irec_remove(ifp, erp_idx); } ifp->if_flags &= ~XFS_IFEXTIREC; } else if (ifp->if_real_bytes) { kmem_free(ifp->if_u1.if_extents); } else if (ifp->if_bytes) { memset(ifp->if_u2.if_inline_ext, 0, XFS_INLINE_EXTS * sizeof(xfs_bmbt_rec_t)); } ifp->if_u1.if_extents = NULL; ifp->if_real_bytes = 0; ifp->if_bytes = 0; } /* * Return a pointer to the extent record for file system block bno. */ xfs_bmbt_rec_host_t * /* pointer to found extent record */ xfs_iext_bno_to_ext( xfs_ifork_t *ifp, /* inode fork pointer */ xfs_fileoff_t bno, /* block number to search for */ xfs_extnum_t *idxp) /* index of target extent */ { xfs_bmbt_rec_host_t *base; /* pointer to first extent */ xfs_filblks_t blockcount = 0; /* number of blocks in extent */ xfs_bmbt_rec_host_t *ep = NULL; /* pointer to target extent */ xfs_ext_irec_t *erp = NULL; /* indirection array pointer */ int high; /* upper boundary in search */ xfs_extnum_t idx = 0; /* index of target extent */ int low; /* lower boundary in search */ xfs_extnum_t nextents; /* number of file extents */ xfs_fileoff_t startoff = 0; /* start offset of extent */ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); if (nextents == 0) { *idxp = 0; return NULL; } low = 0; if (ifp->if_flags & XFS_IFEXTIREC) { /* Find target extent list */ int erp_idx = 0; erp = xfs_iext_bno_to_irec(ifp, bno, &erp_idx); base = erp->er_extbuf; high = erp->er_extcount - 1; } else { base = ifp->if_u1.if_extents; high = nextents - 1; } /* Binary search extent records */ while (low <= high) { idx = (low + high) >> 1; ep = base + idx; startoff = xfs_bmbt_get_startoff(ep); blockcount = xfs_bmbt_get_blockcount(ep); if (bno < startoff) { high = idx - 1; } else if (bno >= startoff + blockcount) { low = idx + 1; } else { /* Convert back to file-based extent index */ if (ifp->if_flags & XFS_IFEXTIREC) { idx += erp->er_extoff; } *idxp = idx; return ep; } } /* Convert back to file-based extent index */ if (ifp->if_flags & XFS_IFEXTIREC) { idx += erp->er_extoff; } if (bno >= startoff + blockcount) { if (++idx == nextents) { ep = NULL; } else { ep = xfs_iext_get_ext(ifp, idx); } } *idxp = idx; return ep; } /* * Return a pointer to the indirection array entry containing the * extent record for filesystem block bno. Store the index of the * target irec in *erp_idxp. */ xfs_ext_irec_t * /* pointer to found extent record */ xfs_iext_bno_to_irec( xfs_ifork_t *ifp, /* inode fork pointer */ xfs_fileoff_t bno, /* block number to search for */ int *erp_idxp) /* irec index of target ext list */ { xfs_ext_irec_t *erp = NULL; /* indirection array pointer */ xfs_ext_irec_t *erp_next; /* next indirection array entry */ int erp_idx; /* indirection array index */ int nlists; /* number of extent irec's (lists) */ int high; /* binary search upper limit */ int low; /* binary search lower limit */ ASSERT(ifp->if_flags & XFS_IFEXTIREC); nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; erp_idx = 0; low = 0; high = nlists - 1; while (low <= high) { erp_idx = (low + high) >> 1; erp = &ifp->if_u1.if_ext_irec[erp_idx]; erp_next = erp_idx < nlists - 1 ? erp + 1 : NULL; if (bno < xfs_bmbt_get_startoff(erp->er_extbuf)) { high = erp_idx - 1; } else if (erp_next && bno >= xfs_bmbt_get_startoff(erp_next->er_extbuf)) { low = erp_idx + 1; } else { break; } } *erp_idxp = erp_idx; return erp; } /* * Return a pointer to the indirection array entry containing the * extent record at file extent index *idxp. Store the index of the * target irec in *erp_idxp and store the page index of the target * extent record in *idxp. */ xfs_ext_irec_t * xfs_iext_idx_to_irec( xfs_ifork_t *ifp, /* inode fork pointer */ xfs_extnum_t *idxp, /* extent index (file -> page) */ int *erp_idxp, /* pointer to target irec */ int realloc) /* new bytes were just added */ { xfs_ext_irec_t *prev; /* pointer to previous irec */ xfs_ext_irec_t *erp = NULL; /* pointer to current irec */ int erp_idx; /* indirection array index */ int nlists; /* number of irec's (ex lists) */ int high; /* binary search upper limit */ int low; /* binary search lower limit */ xfs_extnum_t page_idx = *idxp; /* extent index in target list */ ASSERT(ifp->if_flags & XFS_IFEXTIREC); ASSERT(page_idx >= 0); ASSERT(page_idx <= ifp->if_bytes / sizeof(xfs_bmbt_rec_t)); ASSERT(page_idx < ifp->if_bytes / sizeof(xfs_bmbt_rec_t) || realloc); nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; erp_idx = 0; low = 0; high = nlists - 1; /* Binary search extent irec's */ while (low <= high) { erp_idx = (low + high) >> 1; erp = &ifp->if_u1.if_ext_irec[erp_idx]; prev = erp_idx > 0 ? erp - 1 : NULL; if (page_idx < erp->er_extoff || (page_idx == erp->er_extoff && realloc && prev && prev->er_extcount < XFS_LINEAR_EXTS)) { high = erp_idx - 1; } else if (page_idx > erp->er_extoff + erp->er_extcount || (page_idx == erp->er_extoff + erp->er_extcount && !realloc)) { low = erp_idx + 1; } else if (page_idx == erp->er_extoff + erp->er_extcount && erp->er_extcount == XFS_LINEAR_EXTS) { ASSERT(realloc); page_idx = 0; erp_idx++; erp = erp_idx < nlists ? erp + 1 : NULL; break; } else { page_idx -= erp->er_extoff; break; } } *idxp = page_idx; *erp_idxp = erp_idx; return(erp); } /* * Allocate and initialize an indirection array once the space needed * for incore extents increases above XFS_IEXT_BUFSZ. */ void xfs_iext_irec_init( xfs_ifork_t *ifp) /* inode fork pointer */ { xfs_ext_irec_t *erp; /* indirection array pointer */ xfs_extnum_t nextents; /* number of extents in file */ ASSERT(!(ifp->if_flags & XFS_IFEXTIREC)); nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); ASSERT(nextents <= XFS_LINEAR_EXTS); erp = kmem_alloc(sizeof(xfs_ext_irec_t), KM_NOFS); if (nextents == 0) { ifp->if_u1.if_extents = kmem_alloc(XFS_IEXT_BUFSZ, KM_NOFS); } else if (!ifp->if_real_bytes) { xfs_iext_inline_to_direct(ifp, XFS_IEXT_BUFSZ); } else if (ifp->if_real_bytes < XFS_IEXT_BUFSZ) { xfs_iext_realloc_direct(ifp, XFS_IEXT_BUFSZ); } erp->er_extbuf = ifp->if_u1.if_extents; erp->er_extcount = nextents; erp->er_extoff = 0; ifp->if_flags |= XFS_IFEXTIREC; ifp->if_real_bytes = XFS_IEXT_BUFSZ; ifp->if_bytes = nextents * sizeof(xfs_bmbt_rec_t); ifp->if_u1.if_ext_irec = erp; return; } /* * Allocate and initialize a new entry in the indirection array. */ xfs_ext_irec_t * xfs_iext_irec_new( xfs_ifork_t *ifp, /* inode fork pointer */ int erp_idx) /* index for new irec */ { xfs_ext_irec_t *erp; /* indirection array pointer */ int i; /* loop counter */ int nlists; /* number of irec's (ex lists) */ ASSERT(ifp->if_flags & XFS_IFEXTIREC); nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; /* Resize indirection array */ xfs_iext_realloc_indirect(ifp, ++nlists * sizeof(xfs_ext_irec_t)); /* * Move records down in the array so the * new page can use erp_idx. */ erp = ifp->if_u1.if_ext_irec; for (i = nlists - 1; i > erp_idx; i--) { memmove(&erp[i], &erp[i-1], sizeof(xfs_ext_irec_t)); } ASSERT(i == erp_idx); /* Initialize new extent record */ erp = ifp->if_u1.if_ext_irec; erp[erp_idx].er_extbuf = kmem_alloc(XFS_IEXT_BUFSZ, KM_NOFS); ifp->if_real_bytes = nlists * XFS_IEXT_BUFSZ; memset(erp[erp_idx].er_extbuf, 0, XFS_IEXT_BUFSZ); erp[erp_idx].er_extcount = 0; erp[erp_idx].er_extoff = erp_idx > 0 ? erp[erp_idx-1].er_extoff + erp[erp_idx-1].er_extcount : 0; return (&erp[erp_idx]); } /* * Remove a record from the indirection array. */ void xfs_iext_irec_remove( xfs_ifork_t *ifp, /* inode fork pointer */ int erp_idx) /* irec index to remove */ { xfs_ext_irec_t *erp; /* indirection array pointer */ int i; /* loop counter */ int nlists; /* number of irec's (ex lists) */ ASSERT(ifp->if_flags & XFS_IFEXTIREC); nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; erp = &ifp->if_u1.if_ext_irec[erp_idx]; if (erp->er_extbuf) { xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, -erp->er_extcount); kmem_free(erp->er_extbuf); } /* Compact extent records */ erp = ifp->if_u1.if_ext_irec; for (i = erp_idx; i < nlists - 1; i++) { memmove(&erp[i], &erp[i+1], sizeof(xfs_ext_irec_t)); } /* * Manually free the last extent record from the indirection * array. A call to xfs_iext_realloc_indirect() with a size * of zero would result in a call to xfs_iext_destroy() which * would in turn call this function again, creating a nasty * infinite loop. */ if (--nlists) { xfs_iext_realloc_indirect(ifp, nlists * sizeof(xfs_ext_irec_t)); } else { kmem_free(ifp->if_u1.if_ext_irec); } ifp->if_real_bytes = nlists * XFS_IEXT_BUFSZ; } /* * This is called to clean up large amounts of unused memory allocated * by the indirection array. Before compacting anything though, verify * that the indirection array is still needed and switch back to the * linear extent list (or even the inline buffer) if possible. The * compaction policy is as follows: * * Full Compaction: Extents fit into a single page (or inline buffer) * Partial Compaction: Extents occupy less than 50% of allocated space * No Compaction: Extents occupy at least 50% of allocated space */ void xfs_iext_irec_compact( xfs_ifork_t *ifp) /* inode fork pointer */ { xfs_extnum_t nextents; /* number of extents in file */ int nlists; /* number of irec's (ex lists) */ ASSERT(ifp->if_flags & XFS_IFEXTIREC); nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); if (nextents == 0) { xfs_iext_destroy(ifp); } else if (nextents <= XFS_INLINE_EXTS) { xfs_iext_indirect_to_direct(ifp); xfs_iext_direct_to_inline(ifp, nextents); } else if (nextents <= XFS_LINEAR_EXTS) { xfs_iext_indirect_to_direct(ifp); } else if (nextents < (nlists * XFS_LINEAR_EXTS) >> 1) { xfs_iext_irec_compact_pages(ifp); } } /* * Combine extents from neighboring extent pages. */ void xfs_iext_irec_compact_pages( xfs_ifork_t *ifp) /* inode fork pointer */ { xfs_ext_irec_t *erp, *erp_next;/* pointers to irec entries */ int erp_idx = 0; /* indirection array index */ int nlists; /* number of irec's (ex lists) */ ASSERT(ifp->if_flags & XFS_IFEXTIREC); nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; while (erp_idx < nlists - 1) { erp = &ifp->if_u1.if_ext_irec[erp_idx]; erp_next = erp + 1; if (erp_next->er_extcount <= (XFS_LINEAR_EXTS - erp->er_extcount)) { memcpy(&erp->er_extbuf[erp->er_extcount], erp_next->er_extbuf, erp_next->er_extcount * sizeof(xfs_bmbt_rec_t)); erp->er_extcount += erp_next->er_extcount; /* * Free page before removing extent record * so er_extoffs don't get modified in * xfs_iext_irec_remove. */ kmem_free(erp_next->er_extbuf); erp_next->er_extbuf = NULL; xfs_iext_irec_remove(ifp, erp_idx + 1); nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; } else { erp_idx++; } } } /* * This is called to update the er_extoff field in the indirection * array when extents have been added or removed from one of the * extent lists. erp_idx contains the irec index to begin updating * at and ext_diff contains the number of extents that were added * or removed. */ void xfs_iext_irec_update_extoffs( xfs_ifork_t *ifp, /* inode fork pointer */ int erp_idx, /* irec index to update */ int ext_diff) /* number of new extents */ { int i; /* loop counter */ int nlists; /* number of irec's (ex lists */ ASSERT(ifp->if_flags & XFS_IFEXTIREC); nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; for (i = erp_idx; i < nlists; i++) { ifp->if_u1.if_ext_irec[i].er_extoff += ext_diff; } } /* * Test whether it is appropriate to check an inode for and free post EOF * blocks. The 'force' parameter determines whether we should also consider * regular files that are marked preallocated or append-only. */ bool xfs_can_free_eofblocks(struct xfs_inode *ip, bool force) { /* prealloc/delalloc exists only on regular files */ if (!S_ISREG(ip->i_d.di_mode)) return false; /* * Zero sized files with no cached pages and delalloc blocks will not * have speculative prealloc/delalloc blocks to remove. */ if (VFS_I(ip)->i_size == 0 && VN_CACHED(VFS_I(ip)) == 0 && ip->i_delayed_blks == 0) return false; /* If we haven't read in the extent list, then don't do it now. */ if (!(ip->i_df.if_flags & XFS_IFEXTENTS)) return false; /* * Do not free real preallocated or append-only files unless the file * has delalloc blocks and we are forced to remove them. */ if (ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) if (!force || ip->i_delayed_blks == 0) return false; return true; }