litmus-rt.git - The LITMUS^RT kernel.

	Commit message (Expand)	Author	Age
*	introduce HAVE_EFFICIENT_UNALIGNED_ACCESS Kconfig symbol	Johannes Berg	2008-07-25
*	Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus	Linus Torvalds	2008-07-24
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\| *	s390: use virtio_console for KVM on s390	Christian Borntraeger	2008-07-24
* \|	x86/oprofile/nmi_int: add Nehalem to list of ppro cores	Linus Torvalds	2008-07-24
* \|	x86-64: Clean up 'save/restore_i387()' usage	Linus Torvalds	2008-07-24
\|/
*	Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/k...	Linus Torvalds	2008-07-24
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\| *	nohz: adjust tick_nohz_stop_sched_tick() call of s390 as well	Thomas Gleixner	2008-07-19
\| *	Merge branch 'linus' into timers/nohz	Ingo Molnar	2008-07-18
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\| * \|	nohz: prevent tick stop outside of the idle loop	Thomas Gleixner	2008-07-18
* \| \|	Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/ker...	Linus Torvalds	2008-07-24
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\| * \| \|	arch/mips/kernel/stacktrace.c: Heiko can't type	Andrew Morton	2008-07-23
\| * \| \|	fix core/stacktrace changes on avr32, mips, sh	Heiko Carstens	2008-07-18
\| \| \|/ \| \|/\|
* \| \|	x86-64: make BUILD_IRQ() also reset section back	Linus Torvalds	2008-07-24
* \| \|	Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kern...	Linus Torvalds	2008-07-24
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\| * \| \|	x86: BUILD_IRQ say .text to avoid .data.percpu	Hugh Dickins	2008-07-24
\| * \| \|	xen: don't use sysret for sysexit32	Jeremy Fitzhardinge	2008-07-24
\| * \| \|	x86: call early_cpu_init at the same point	Jeremy Fitzhardinge	2008-07-24
* \| \| \|	Merge branch 'semaphore' of git://git.kernel.org/pub/scm/linux/kernel/git/wil...	Linus Torvalds	2008-07-24
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\| * \| \| \|	Remove use of asm/semaphore.h	Matthew Wilcox	2008-07-24
\| \|/ / /
* \| \| \|	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ger...	Linus Torvalds	2008-07-24
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\| * \| \| \|	m68knommu: put ColdFire head code into .text.head section	Greg Ungerer	2008-07-23
\| * \| \| \|	m68knommu: MCF5307 PIT GENERIC_CLOCKEVENTS support	Sebastian Siewior	2008-07-23
\| * \| \| \|	m68knommu: add ffs and __ffs plattform which support ISA A+ or ISA C	Sebastian Siewior	2008-07-23
\| * \| \| \|	m68knommu: add sched_clock() for the DMA timer	Sebastian Siewior	2008-07-23
\| * \| \| \|	m68knommu: complete generic time	Sebastian Siewior	2008-07-23
\| * \| \| \|	m68knommu: move code within time.c	Sebastian Siewior	2008-07-23
\| * \| \| \|	m68knommu: m68knommu: add old stack trace method	Sebastian Siewior	2008-07-23
\| * \| \| \|	m68knommu: Add Coldfire DMA Timer support	Sebastian Siewior	2008-07-23
\| * \| \| \|	m68knommu: defconfig for M5407C3 board	Greg Ungerer	2008-07-23
\| * \| \| \|	m68knommu: defconfig for M5307C3 board	Greg Ungerer	2008-07-23
\| * \| \| \|	m68knommu: defconfig for M5275EVB board	Greg Ungerer	2008-07-23
\| * \| \| \|	m68knommu: defconfig for M5249EVB board	Greg Ungerer	2008-07-23
\| * \| \| \|	m68knommu: change to a configs directory for board configurations	Greg Ungerer	2008-07-23
* \| \| \| \|	Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-leds	Linus Torvalds	2008-07-24
\|\ \ \ \ \
\| * \| \| \| \|	leds: Add pca9532 platform data for Thecus N2100	Riku Voipio	2008-07-23
\| \|/ / / /
* \| \| \| \|	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6	Linus Torvalds	2008-07-24
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\| * \| \| \| \|	sparc64: Fix cpufreq notifier registry.	David S. Miller	2008-07-23
\| * \| \| \| \|	sparc64: Fix lockdep issues in LDC protocol layer.	David S. Miller	2008-07-23
* \| \| \| \| \|	rtc-cmos: avoid spurious irqs	David Brownell	2008-07-24
* \| \| \| \| \|	flag parameters add-on: remove epoll_create size param	Ulrich Drepper	2008-07-24
* \| \| \| \| \|	flag parameters: inotify_init	Ulrich Drepper	2008-07-24
* \| \| \| \| \|	flag parameters: pipe	Ulrich Drepper	2008-07-24
* \| \| \| \| \|	flag parameters: dup2	Ulrich Drepper	2008-07-24
* \| \| \| \| \|	flag parameters: epoll_create	Ulrich Drepper	2008-07-24
* \| \| \| \| \|	flag parameters: eventfd	Ulrich Drepper	2008-07-24
* \| \| \| \| \|	flag parameters: signalfd	Ulrich Drepper	2008-07-24
* \| \| \| \| \|	remove the v850 port	Adrian Bunk	2008-07-24
* \| \| \| \| \|	UML: make several more things static	WANG Cong	2008-07-24
* \| \| \| \| \|	arch/um/kernel/mem.c: remove arch_validate()	WANG Cong	2008-07-24
* \| \| \| \| \|	arch/um/kernel/irq.c: clean up some functions	WANG Cong	2008-07-24

/* * Copyright (c) 2000-2006 Silicon Graphics, Inc. * All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include "xfs.h" #include "xfs_fs.h" #include "xfs_types.h" #include "xfs_bit.h" #include "xfs_log.h" #include "xfs_inum.h" #include "xfs_trans.h" #include "xfs_sb.h" #include "xfs_ag.h" #include "xfs_dir2.h" #include "xfs_dmapi.h" #include "xfs_mount.h" #include "xfs_da_btree.h" #include "xfs_bmap_btree.h" #include "xfs_alloc_btree.h" #include "xfs_ialloc_btree.h" #include "xfs_dir2_sf.h" #include "xfs_attr_sf.h" #include "xfs_dinode.h" #include "xfs_inode.h" #include "xfs_inode_item.h" #include "xfs_itable.h" #include "xfs_btree.h" #include "xfs_ialloc.h" #include "xfs_alloc.h" #include "xfs_bmap.h" #include "xfs_acl.h" #include "xfs_attr.h" #include "xfs_rw.h" #include "xfs_error.h" #include "xfs_quota.h" #include "xfs_utils.h" #include "xfs_rtalloc.h" #include "xfs_trans_space.h" #include "xfs_log_priv.h" #include "xfs_filestream.h" #include "xfs_vnodeops.h" int xfs_setattr( struct xfs_inode *ip, struct iattr *iattr, int flags) { xfs_mount_t *mp = ip->i_mount; struct inode *inode = VFS_I(ip); int mask = iattr->ia_valid; xfs_trans_t *tp; int code; uint lock_flags; uint commit_flags=0; uid_t uid=0, iuid=0; gid_t gid=0, igid=0; int timeflags = 0; struct xfs_dquot *udqp, *gdqp, *olddquot1, *olddquot2; int need_iolock = 1; xfs_itrace_entry(ip); if (mp->m_flags & XFS_MOUNT_RDONLY) return XFS_ERROR(EROFS); if (XFS_FORCED_SHUTDOWN(mp)) return XFS_ERROR(EIO); code = -inode_change_ok(inode, iattr); if (code) return code; olddquot1 = olddquot2 = NULL; udqp = gdqp = NULL; /* * If disk quotas is on, we make sure that the dquots do exist on disk, * before we start any other transactions. Trying to do this later * is messy. We don't care to take a readlock to look at the ids * in inode here, because we can't hold it across the trans_reserve. * If the IDs do change before we take the ilock, we're covered * because the i_*dquot fields will get updated anyway. */ if (XFS_IS_QUOTA_ON(mp) && (mask & (ATTR_UID|ATTR_GID))) { uint qflags = 0; if ((mask & ATTR_UID) && XFS_IS_UQUOTA_ON(mp)) { uid = iattr->ia_uid; qflags |= XFS_QMOPT_UQUOTA; } else { uid = ip->i_d.di_uid; } if ((mask & ATTR_GID) && XFS_IS_GQUOTA_ON(mp)) { gid = iattr->ia_gid; qflags |= XFS_QMOPT_GQUOTA; } else { gid = ip->i_d.di_gid; } /* * We take a reference when we initialize udqp and gdqp, * so it is important that we never blindly double trip on * the same variable. See xfs_create() for an example. */ ASSERT(udqp == NULL); ASSERT(gdqp == NULL); code = xfs_qm_vop_dqalloc(ip, uid, gid, ip->i_d.di_projid, qflags, &udqp, &gdqp); if (code) return code; } /* * For the other attributes, we acquire the inode lock and * first do an error checking pass. */ tp = NULL; lock_flags = XFS_ILOCK_EXCL; if (flags & XFS_ATTR_NOLOCK) need_iolock = 0; if (!(mask & ATTR_SIZE)) { if ((mask != (ATTR_CTIME|ATTR_ATIME|ATTR_MTIME)) || (mp->m_flags & XFS_MOUNT_WSYNC)) { tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_NOT_SIZE); commit_flags = 0; if ((code = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0))) { lock_flags = 0; goto error_return; } } } else { if (DM_EVENT_ENABLED(ip, DM_EVENT_TRUNCATE) && !(flags & XFS_ATTR_DMI)) { int dmflags = AT_DELAY_FLAG(flags) | DM_SEM_FLAG_WR; code = XFS_SEND_DATA(mp, DM_EVENT_TRUNCATE, ip, iattr->ia_size, 0, dmflags, NULL); if (code) { lock_flags = 0; goto error_return; } } if (need_iolock) lock_flags |= XFS_IOLOCK_EXCL; } xfs_ilock(ip, lock_flags); /* * Change file ownership. Must be the owner or privileged. */ if (mask & (ATTR_UID|ATTR_GID)) { /* * These IDs could have changed since we last looked at them. * But, we're assured that if the ownership did change * while we didn't have the inode locked, inode's dquot(s) * would have changed also. */ iuid = ip->i_d.di_uid; igid = ip->i_d.di_gid; gid = (mask & ATTR_GID) ? iattr->ia_gid : igid; uid = (mask & ATTR_UID) ? iattr->ia_uid : iuid; /* * Do a quota reservation only if uid/gid is actually * going to change. */ if (XFS_IS_QUOTA_RUNNING(mp) && ((XFS_IS_UQUOTA_ON(mp) && iuid != uid) || (XFS_IS_GQUOTA_ON(mp) && igid != gid))) { ASSERT(tp); code = xfs_qm_vop_chown_reserve(tp, ip, udqp, gdqp, capable(CAP_FOWNER) ? XFS_QMOPT_FORCE_RES : 0); if (code) /* out of quota */ goto error_return; } } /* * Truncate file. Must have write permission and not be a directory. */ if (mask & ATTR_SIZE) { /* Short circuit the truncate case for zero length files */ if (iattr->ia_size == 0 && ip->i_size == 0 && ip->i_d.di_nextents == 0) { xfs_iunlock(ip, XFS_ILOCK_EXCL); lock_flags &= ~XFS_ILOCK_EXCL; if (mask & ATTR_CTIME) xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); code = 0; goto error_return; } if (S_ISDIR(ip->i_d.di_mode)) { code = XFS_ERROR(EISDIR); goto error_return; } else if (!S_ISREG(ip->i_d.di_mode)) { code = XFS_ERROR(EINVAL); goto error_return; } /* * Make sure that the dquots are attached to the inode. */ code = xfs_qm_dqattach_locked(ip, 0); if (code) goto error_return; /* * Now we can make the changes. Before we join the inode * to the transaction, if ATTR_SIZE is set then take care of * the part of the truncation that must be done without the * inode lock. This needs to be done before joining the inode * to the transaction, because the inode cannot be unlocked * once it is a part of the transaction. */ if (iattr->ia_size > ip->i_size) { /* * Do the first part of growing a file: zero any data * in the last block that is beyond the old EOF. We * need to do this before the inode is joined to the * transaction to modify the i_size. */ code = xfs_zero_eof(ip, iattr->ia_size, ip->i_size); } xfs_iunlock(ip, XFS_ILOCK_EXCL); /* * We are going to log the inode size change in this * transaction so any previous writes that are beyond the on * disk EOF and the new EOF that have not been written out need * to be written here. If we do not write the data out, we * expose ourselves to the null files problem. * * Only flush from the on disk size to the smaller of the in * memory file size or the new size as that's the range we * really care about here and prevents waiting for other data * not within the range we care about here. */ if (!code && ip->i_size != ip->i_d.di_size && iattr->ia_size > ip->i_d.di_size) { code = xfs_flush_pages(ip, ip->i_d.di_size, iattr->ia_size, XFS_B_ASYNC, FI_NONE); } /* wait for all I/O to complete */ xfs_ioend_wait(ip); if (!code) code = xfs_itruncate_data(ip, iattr->ia_size); if (code) { ASSERT(tp == NULL); lock_flags &= ~XFS_ILOCK_EXCL; ASSERT(lock_flags == XFS_IOLOCK_EXCL); goto error_return; } tp = xfs_trans_alloc(mp, XFS_TRANS_SETATTR_SIZE); if ((code = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) { xfs_trans_cancel(tp, 0); if (need_iolock) xfs_iunlock(ip, XFS_IOLOCK_EXCL); return code; } commit_flags = XFS_TRANS_RELEASE_LOG_RES; xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, lock_flags); xfs_trans_ihold(tp, ip); /* * Only change the c/mtime if we are changing the size * or we are explicitly asked to change it. This handles * the semantic difference between truncate() and ftruncate() * as implemented in the VFS. */ if (iattr->ia_size != ip->i_size || (mask & ATTR_CTIME)) timeflags |= XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG; if (iattr->ia_size > ip->i_size) { ip->i_d.di_size = iattr->ia_size; ip->i_size = iattr->ia_size; if (!(flags & XFS_ATTR_DMI)) xfs_ichgtime(ip, XFS_ICHGTIME_CHG); xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); } else if (iattr->ia_size <= ip->i_size || (iattr->ia_size == 0 && ip->i_d.di_nextents)) { /* * signal a sync transaction unless * we're truncating an already unlinked * file on a wsync filesystem */ code = xfs_itruncate_finish(&tp, ip, iattr->ia_size, XFS_DATA_FORK, ((ip->i_d.di_nlink != 0 || !(mp->m_flags & XFS_MOUNT_WSYNC)) ? 1 : 0)); if (code) goto abort_return; /* * Truncated "down", so we're removing references * to old data here - if we now delay flushing for * a long time, we expose ourselves unduly to the * notorious NULL files problem. So, we mark this * vnode and flush it when the file is closed, and * do not wait the usual (long) time for writeout. */ xfs_iflags_set(ip, XFS_ITRUNCATED); } } else if (tp) { xfs_trans_ijoin(tp, ip, lock_flags); xfs_trans_ihold(tp, ip); } /* * Change file ownership. Must be the owner or privileged. */ if (mask & (ATTR_UID|ATTR_GID)) { /* * CAP_FSETID overrides the following restrictions: * * The set-user-ID and set-group-ID bits of a file will be * cleared upon successful return from chown() */ if ((ip->i_d.di_mode & (S_ISUID|S_ISGID)) && !capable(CAP_FSETID)) { ip->i_d.di_mode &= ~(S_ISUID|S_ISGID); } /* * Change the ownerships and register quota modifications * in the transaction. */ if (iuid != uid) { if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_UQUOTA_ON(mp)) { ASSERT(mask & ATTR_UID); ASSERT(udqp); olddquot1 = xfs_qm_vop_chown(tp, ip, &ip->i_udquot, udqp); } ip->i_d.di_uid = uid; inode->i_uid = uid; } if (igid != gid) { if (XFS_IS_QUOTA_RUNNING(mp) && XFS_IS_GQUOTA_ON(mp)) { ASSERT(!XFS_IS_PQUOTA_ON(mp)); ASSERT(mask & ATTR_GID); ASSERT(gdqp); olddquot2 = xfs_qm_vop_chown(tp, ip, &ip->i_gdquot, gdqp); } ip->i_d.di_gid = gid; inode->i_gid = gid; } xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE); timeflags |= XFS_ICHGTIME_CHG; } /* * Change file access modes. */ if (mask & ATTR_MODE) { umode_t mode = iattr->ia_mode; if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID)) mode &= ~S_ISGID; ip->i_d.di_mode &= S_IFMT; ip->i_d.di_mode |= mode & ~S_IFMT; inode->i_mode &= S_IFMT; inode->i_mode |= mode & ~S_IFMT; xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); timeflags |= XFS_ICHGTIME_CHG; } /* * Change file access or modified times. */ if (mask & (ATTR_ATIME|ATTR_MTIME)) { if (mask & ATTR_ATIME) { inode->i_atime = iattr->ia_atime; ip->i_d.di_atime.t_sec = iattr->ia_atime.tv_sec; ip->i_d.di_atime.t_nsec = iattr->ia_atime.tv_nsec; ip->i_update_core = 1; } if (mask & ATTR_MTIME) { inode->i_mtime = iattr->ia_mtime; ip->i_d.di_mtime.t_sec = iattr->ia_mtime.tv_sec; ip->i_d.di_mtime.t_nsec = iattr->ia_mtime.tv_nsec; timeflags &= ~XFS_ICHGTIME_MOD; timeflags |= XFS_ICHGTIME_CHG; } if (tp && (mask & (ATTR_MTIME_SET|ATTR_ATIME_SET))) xfs_trans_log_inode (tp, ip, XFS_ILOG_CORE); } /* * Change file inode change time only if ATTR_CTIME set * AND we have been called by a DMI function. */ if ((flags & XFS_ATTR_DMI) && (mask & ATTR_CTIME)) { inode->i_ctime = iattr->ia_ctime; ip->i_d.di_ctime.t_sec = iattr->ia_ctime.tv_sec; ip->i_d.di_ctime.t_nsec = iattr->ia_ctime.tv_nsec; ip->i_update_core = 1; timeflags &= ~XFS_ICHGTIME_CHG; } /* * Send out timestamp changes that need to be set to the * current time. Not done when called by a DMI function. */ if (timeflags && !(flags & XFS_ATTR_DMI)) xfs_ichgtime(ip, timeflags); XFS_STATS_INC(xs_ig_attrchg); /* * If this is a synchronous mount, make sure that the * transaction goes to disk before returning to the user. * This is slightly sub-optimal in that truncates require * two sync transactions instead of one for wsync filesystems. * One for the truncate and one for the timestamps since we * don't want to change the timestamps unless we're sure the * truncate worked. Truncates are less than 1% of the laddis * mix so this probably isn't worth the trouble to optimize. */ code = 0; if (tp) { if (mp->m_flags & XFS_MOUNT_WSYNC) xfs_trans_set_sync(tp); code = xfs_trans_commit(tp, commit_flags); } xfs_iunlock(ip, lock_flags); /* * Release any dquot(s) the inode had kept before chown. */ xfs_qm_dqrele(olddquot1); xfs_qm_dqrele(olddquot2); xfs_qm_dqrele(udqp); xfs_qm_dqrele(gdqp); if (code) return code; /* * XXX(hch): Updating the ACL entries is not atomic vs the i_mode * update. We could avoid this with linked transactions * and passing down the transaction pointer all the way * to attr_set. No previous user of the generic * Posix ACL code seems to care about this issue either. */ if ((mask & ATTR_MODE) && !(flags & XFS_ATTR_NOACL)) { code = -xfs_acl_chmod(inode); if (code) return XFS_ERROR(code); } if (DM_EVENT_ENABLED(ip, DM_EVENT_ATTRIBUTE) && !(flags & XFS_ATTR_DMI)) { (void) XFS_SEND_NAMESP(mp, DM_EVENT_ATTRIBUTE, ip, DM_RIGHT_NULL, NULL, DM_RIGHT_NULL, NULL, NULL, 0, 0, AT_DELAY_FLAG(flags)); } return 0; abort_return: commit_flags |= XFS_TRANS_ABORT; /* FALLTHROUGH */ error_return: xfs_qm_dqrele(udqp); xfs_qm_dqrele(gdqp); if (tp) { xfs_trans_cancel(tp, commit_flags); } if (lock_flags != 0) { xfs_iunlock(ip, lock_flags); } return code; } /* * The maximum pathlen is 1024 bytes. Since the minimum file system * blocksize is 512 bytes, we can get a max of 2 extents back from * bmapi. */ #define SYMLINK_MAPS 2 STATIC int xfs_readlink_bmap( xfs_inode_t *ip, char *link) { xfs_mount_t *mp = ip->i_mount; int pathlen = ip->i_d.di_size; int nmaps = SYMLINK_MAPS; xfs_bmbt_irec_t mval[SYMLINK_MAPS]; xfs_daddr_t d; int byte_cnt; int n; xfs_buf_t *bp; int error = 0; error = xfs_bmapi(NULL, ip, 0, XFS_B_TO_FSB(mp, pathlen), 0, NULL, 0, mval, &nmaps, NULL, NULL); if (error) goto out; for (n = 0; n < nmaps; n++) { d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock); byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount); bp = xfs_buf_read_flags(mp->m_ddev_targp, d, BTOBB(byte_cnt), XBF_LOCK | XBF_MAPPED | XBF_DONT_BLOCK); error = XFS_BUF_GETERROR(bp); if (error) { xfs_ioerror_alert("xfs_readlink", ip->i_mount, bp, XFS_BUF_ADDR(bp)); xfs_buf_relse(bp); goto out; } if (pathlen < byte_cnt) byte_cnt = pathlen; pathlen -= byte_cnt; memcpy(link, XFS_BUF_PTR(bp), byte_cnt); xfs_buf_relse(bp); } link[ip->i_d.di_size] = '\0'; error = 0; out: return error; } int xfs_readlink( xfs_inode_t *ip, char *link) { xfs_mount_t *mp = ip->i_mount; int pathlen; int error = 0; xfs_itrace_entry(ip); if (XFS_FORCED_SHUTDOWN(mp)) return XFS_ERROR(EIO); xfs_ilock(ip, XFS_ILOCK_SHARED); ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFLNK); ASSERT(ip->i_d.di_size <= MAXPATHLEN); pathlen = ip->i_d.di_size; if (!pathlen) goto out; if (ip->i_df.if_flags & XFS_IFINLINE) { memcpy(link, ip->i_df.if_u1.if_data, pathlen); link[pathlen] = '\0'; } else { error = xfs_readlink_bmap(ip, link); } out: xfs_iunlock(ip, XFS_ILOCK_SHARED); return error; } /* * xfs_fsync * * This is called to sync the inode and its data out to disk. We need to hold * the I/O lock while flushing the data, and the inode lock while flushing the * inode. The inode lock CANNOT be held while flushing the data, so acquire * after we're done with that. */ int xfs_fsync( xfs_inode_t *ip) { xfs_trans_t *tp; int error; int log_flushed = 0, changed = 1; xfs_itrace_entry(ip); if (XFS_FORCED_SHUTDOWN(ip->i_mount)) return XFS_ERROR(EIO); /* capture size updates in I/O completion before writing the inode. */ error = xfs_wait_on_pages(ip, 0, -1); if (error) return XFS_ERROR(error); /* * We always need to make sure that the required inode state is safe on * disk. The vnode might be clean but we still might need to force the * log because of committed transactions that haven't hit the disk yet. * Likewise, there could be unflushed non-transactional changes to the * inode core that have to go to disk and this requires us to issue * a synchronous transaction to capture these changes correctly. * * This code relies on the assumption that if the update_* fields * of the inode are clear and the inode is unpinned then it is clean * and no action is required. */ xfs_ilock(ip, XFS_ILOCK_SHARED); if (!(ip->i_update_size || ip->i_update_core)) { /* * Timestamps/size haven't changed since last inode flush or * inode transaction commit. That means either nothing got * written or a transaction committed which caught the updates. * If the latter happened and the transaction hasn't hit the * disk yet, the inode will be still be pinned. If it is, * force the log. */ xfs_iunlock(ip, XFS_ILOCK_SHARED); if (xfs_ipincount(ip)) { error = _xfs_log_force(ip->i_mount, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC, &log_flushed); } else { /* * If the inode is not pinned and nothing has changed * we don't need to flush the cache. */ changed = 0; } } else { /* * Kick off a transaction to log the inode core to get the * updates. The sync transaction will also force the log. */ xfs_iunlock(ip, XFS_ILOCK_SHARED); tp = xfs_trans_alloc(ip->i_mount, XFS_TRANS_FSYNC_TS); error = xfs_trans_reserve(tp, 0, XFS_FSYNC_TS_LOG_RES(ip->i_mount), 0, 0, 0); if (error) { xfs_trans_cancel(tp, 0); return error; } xfs_ilock(ip, XFS_ILOCK_EXCL); /* * Note - it's possible that we might have pushed ourselves out * of the way during trans_reserve which would flush the inode. * But there's no guarantee that the inode buffer has actually * gone out yet (it's delwri). Plus the buffer could be pinned * anyway if it's part of an inode in another recent * transaction. So we play it safe and fire off the * transaction anyway. */ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); xfs_trans_ihold(tp, ip); xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); xfs_trans_set_sync(tp); error = _xfs_trans_commit(tp, 0, &log_flushed); xfs_iunlock(ip, XFS_ILOCK_EXCL); } if ((ip->i_mount->m_flags & XFS_MOUNT_BARRIER) && changed) { /* * If the log write didn't issue an ordered tag we need * to flush the disk cache for the data device now. */ if (!log_flushed) xfs_blkdev_issue_flush(ip->i_mount->m_ddev_targp); /* * If this inode is on the RT dev we need to flush that * cache as well. */ if (XFS_IS_REALTIME_INODE(ip)) xfs_blkdev_issue_flush(ip->i_mount->m_rtdev_targp); } return error; } /* * This is called by xfs_inactive to free any blocks beyond eof * when the link count isn't zero and by xfs_dm_punch_hole() when * punching a hole to EOF. */ int xfs_free_eofblocks( xfs_mount_t *mp, xfs_inode_t *ip, int flags) { xfs_trans_t *tp; int error; xfs_fileoff_t end_fsb; xfs_fileoff_t last_fsb; xfs_filblks_t map_len; int nimaps; xfs_bmbt_irec_t imap; int use_iolock = (flags & XFS_FREE_EOF_LOCK); /* * Figure out if there are any blocks beyond the end * of the file. If not, then there is nothing to do. */ end_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)ip->i_size)); last_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); map_len = last_fsb - end_fsb; if (map_len <= 0) return 0; nimaps = 1; xfs_ilock(ip, XFS_ILOCK_SHARED); error = xfs_bmapi(NULL, ip, end_fsb, map_len, 0, NULL, 0, &imap, &nimaps, NULL, NULL); xfs_iunlock(ip, XFS_ILOCK_SHARED); if (!error && (nimaps != 0) && (imap.br_startblock != HOLESTARTBLOCK || ip->i_delayed_blks)) { /* * Attach the dquots to the inode up front. */ error = xfs_qm_dqattach(ip, 0); if (error) return error; /* * There are blocks after the end of file. * Free them up now by truncating the file to * its current size. */ tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); /* * Do the xfs_itruncate_start() call before * reserving any log space because * itruncate_start will call into the buffer * cache and we can't * do that within a transaction. */ if (use_iolock) xfs_ilock(ip, XFS_IOLOCK_EXCL); error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, ip->i_size); if (error) { xfs_trans_cancel(tp, 0); if (use_iolock) xfs_iunlock(ip, XFS_IOLOCK_EXCL); return error; } error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT); if (error) { ASSERT(XFS_FORCED_SHUTDOWN(mp)); xfs_trans_cancel(tp, 0); xfs_iunlock(ip, XFS_IOLOCK_EXCL); return error; } xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); xfs_trans_ihold(tp, ip); error = xfs_itruncate_finish(&tp, ip, ip->i_size, XFS_DATA_FORK, 0); /* * If we get an error at this point we * simply don't bother truncating the file. */ if (error) { xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT)); } else { error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); } xfs_iunlock(ip, (use_iolock ? (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL) : XFS_ILOCK_EXCL)); } return error; } /* * Free a symlink that has blocks associated with it. */ STATIC int xfs_inactive_symlink_rmt( xfs_inode_t *ip, xfs_trans_t **tpp) { xfs_buf_t *bp; int committed; int done; int error; xfs_fsblock_t first_block; xfs_bmap_free_t free_list; int i; xfs_mount_t *mp; xfs_bmbt_irec_t mval[SYMLINK_MAPS]; int nmaps; xfs_trans_t *ntp; int size; xfs_trans_t *tp; tp = *tpp; mp = ip->i_mount; ASSERT(ip->i_d.di_size > XFS_IFORK_DSIZE(ip)); /* * We're freeing a symlink that has some * blocks allocated to it. Free the * blocks here. We know that we've got * either 1 or 2 extents and that we can * free them all in one bunmapi call. */ ASSERT(ip->i_d.di_nextents > 0 && ip->i_d.di_nextents <= 2); if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) { ASSERT(XFS_FORCED_SHUTDOWN(mp)); xfs_trans_cancel(tp, 0); *tpp = NULL; return error; } /* * Lock the inode, fix the size, and join it to the transaction. * Hold it so in the normal path, we still have it locked for * the second transaction. In the error paths we need it * held so the cancel won't rele it, see below. */ xfs_ilock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); size = (int)ip->i_d.di_size; ip->i_d.di_size = 0; xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); xfs_trans_ihold(tp, ip); xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); /* * Find the block(s) so we can inval and unmap them. */ done = 0; xfs_bmap_init(&free_list, &first_block); nmaps = ARRAY_SIZE(mval); if ((error = xfs_bmapi(tp, ip, 0, XFS_B_TO_FSB(mp, size), XFS_BMAPI_METADATA, &first_block, 0, mval, &nmaps, &free_list, NULL))) goto error0; /* * Invalidate the block(s). */ for (i = 0; i < nmaps; i++) { bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, XFS_FSB_TO_DADDR(mp, mval[i].br_startblock), XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0); xfs_trans_binval(tp, bp); } /* * Unmap the dead block(s) to the free_list. */ if ((error = xfs_bunmapi(tp, ip, 0, size, XFS_BMAPI_METADATA, nmaps, &first_block, &free_list, NULL, &done))) goto error1; ASSERT(done); /* * Commit the first transaction. This logs the EFI and the inode. */ if ((error = xfs_bmap_finish(&tp, &free_list, &committed))) goto error1; /* * The transaction must have been committed, since there were * actually extents freed by xfs_bunmapi. See xfs_bmap_finish. * The new tp has the extent freeing and EFDs. */ ASSERT(committed); /* * The first xact was committed, so add the inode to the new one. * Mark it dirty so it will be logged and moved forward in the log as * part of every commit. */ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); xfs_trans_ihold(tp, ip); xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); /* * Get a new, empty transaction to return to our caller. */ ntp = xfs_trans_dup(tp); /* * Commit the transaction containing extent freeing and EFDs. * If we get an error on the commit here or on the reserve below, * we need to unlock the inode since the new transaction doesn't * have the inode attached. */ error = xfs_trans_commit(tp, 0); tp = ntp; if (error) { ASSERT(XFS_FORCED_SHUTDOWN(mp)); goto error0; } /* * transaction commit worked ok so we can drop the extra ticket * reference that we gained in xfs_trans_dup() */ xfs_log_ticket_put(tp->t_ticket); /* * Remove the memory for extent descriptions (just bookkeeping). */ if (ip->i_df.if_bytes) xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK); ASSERT(ip->i_df.if_bytes == 0); /* * Put an itruncate log reservation in the new transaction * for our caller. */ if ((error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT))) { ASSERT(XFS_FORCED_SHUTDOWN(mp)); goto error0; } /* * Return with the inode locked but not joined to the transaction. */ *tpp = tp; return 0; error1: xfs_bmap_cancel(&free_list); error0: /* * Have to come here with the inode locked and either * (held and in the transaction) or (not in the transaction). * If the inode isn't held then cancel would iput it, but * that's wrong since this is inactive and the vnode ref * count is 0 already. * Cancel won't do anything to the inode if held, but it still * needs to be locked until the cancel is done, if it was * joined to the transaction. */ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); *tpp = NULL; return error; } STATIC int xfs_inactive_symlink_local( xfs_inode_t *ip, xfs_trans_t **tpp) { int error; ASSERT(ip->i_d.di_size <= XFS_IFORK_DSIZE(ip)); /* * We're freeing a symlink which fit into * the inode. Just free the memory used * to hold the old symlink. */ error = xfs_trans_reserve(*tpp, 0, XFS_ITRUNCATE_LOG_RES(ip->i_mount), 0, XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT); if (error) { xfs_trans_cancel(*tpp, 0); *tpp = NULL; return error; } xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); /* * Zero length symlinks _can_ exist. */ if (ip->i_df.if_bytes > 0) { xfs_idata_realloc(ip, -(ip->i_df.if_bytes), XFS_DATA_FORK); ASSERT(ip->i_df.if_bytes == 0); } return 0; } STATIC int xfs_inactive_attrs( xfs_inode_t *ip, xfs_trans_t **tpp) { xfs_trans_t *tp; int error; xfs_mount_t *mp; ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); tp = *tpp; mp = ip->i_mount; ASSERT(ip->i_d.di_forkoff != 0); error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); xfs_iunlock(ip, XFS_ILOCK_EXCL); if (error) goto error_unlock; error = xfs_attr_inactive(ip); if (error) goto error_unlock; tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); error = xfs_trans_reserve(tp, 0, XFS_IFREE_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_INACTIVE_LOG_COUNT); if (error) goto error_cancel; xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); xfs_trans_ihold(tp, ip); xfs_idestroy_fork(ip, XFS_ATTR_FORK); ASSERT(ip->i_d.di_anextents == 0); *tpp = tp; return 0; error_cancel: ASSERT(XFS_FORCED_SHUTDOWN(mp)); xfs_trans_cancel(tp, 0); error_unlock: *tpp = NULL; xfs_iunlock(ip, XFS_IOLOCK_EXCL); return error; } int xfs_release( xfs_inode_t *ip) { xfs_mount_t *mp = ip->i_mount; int error; if (!S_ISREG(ip->i_d.di_mode) || (ip->i_d.di_mode == 0)) return 0; /* If this is a read-only mount, don't do this (would generate I/O) */ if (mp->m_flags & XFS_MOUNT_RDONLY) return 0; if (!XFS_FORCED_SHUTDOWN(mp)) { int truncated; /* * If we are using filestreams, and we have an unlinked * file that we are processing the last close on, then nothing * will be able to reopen and write to this file. Purge this * inode from the filestreams cache so that it doesn't delay * teardown of the inode. */ if ((ip->i_d.di_nlink == 0) && xfs_inode_is_filestream(ip)) xfs_filestream_deassociate(ip); /* * If we previously truncated this file and removed old data * in the process, we want to initiate "early" writeout on * the last close. This is an attempt to combat the notorious * NULL files problem which is particularly noticable from a * truncate down, buffered (re-)write (delalloc), followed by * a crash. What we are effectively doing here is * significantly reducing the time window where we'd otherwise * be exposed to that problem. */ truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED); if (truncated && VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0) xfs_flush_pages(ip, 0, -1, XFS_B_ASYNC, FI_NONE); } if (ip->i_d.di_nlink != 0) { if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) && ((ip->i_size > 0) || (VN_CACHED(VFS_I(ip)) > 0 || ip->i_delayed_blks > 0)) && (ip->i_df.if_flags & XFS_IFEXTENTS)) && (!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)))) { error = xfs_free_eofblocks(mp, ip, XFS_FREE_EOF_LOCK); if (error) return error; } } return 0; } /* * xfs_inactive * * This is called when the vnode reference count for the vnode * goes to zero. If the file has been unlinked, then it must * now be truncated. Also, we clear all of the read-ahead state * kept for the inode here since the file is now closed. */ int xfs_inactive( xfs_inode_t *ip) { xfs_bmap_free_t free_list; xfs_fsblock_t first_block; int committed; xfs_trans_t *tp; xfs_mount_t *mp; int error; int truncate; xfs_itrace_entry(ip); /* * If the inode is already free, then there can be nothing * to clean up here. */ if (ip->i_d.di_mode == 0 || is_bad_inode(VFS_I(ip))) { ASSERT(ip->i_df.if_real_bytes == 0); ASSERT(ip->i_df.if_broot_bytes == 0); return VN_INACTIVE_CACHE; } /* * Only do a truncate if it's a regular file with * some actual space in it. It's OK to look at the * inode's fields without the lock because we're the * only one with a reference to the inode. */ truncate = ((ip->i_d.di_nlink == 0) && ((ip->i_d.di_size != 0) || (ip->i_size != 0) || (ip->i_d.di_nextents > 0) || (ip->i_delayed_blks > 0)) && ((ip->i_d.di_mode & S_IFMT) == S_IFREG)); mp = ip->i_mount; if (ip->i_d.di_nlink == 0 && DM_EVENT_ENABLED(ip, DM_EVENT_DESTROY)) XFS_SEND_DESTROY(mp, ip, DM_RIGHT_NULL); error = 0; /* If this is a read-only mount, don't do this (would generate I/O) */ if (mp->m_flags & XFS_MOUNT_RDONLY) goto out; if (ip->i_d.di_nlink != 0) { if ((((ip->i_d.di_mode & S_IFMT) == S_IFREG) && ((ip->i_size > 0) || (VN_CACHED(VFS_I(ip)) > 0 || ip->i_delayed_blks > 0)) && (ip->i_df.if_flags & XFS_IFEXTENTS) && (!(ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) || (ip->i_delayed_blks != 0)))) { error = xfs_free_eofblocks(mp, ip, XFS_FREE_EOF_LOCK); if (error) return VN_INACTIVE_CACHE; } goto out; } ASSERT(ip->i_d.di_nlink == 0); error = xfs_qm_dqattach(ip, 0); if (error) return VN_INACTIVE_CACHE; tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE); if (truncate) { /* * Do the xfs_itruncate_start() call before * reserving any log space because itruncate_start * will call into the buffer cache and we can't * do that within a transaction. */ xfs_ilock(ip, XFS_IOLOCK_EXCL); error = xfs_itruncate_start(ip, XFS_ITRUNC_DEFINITE, 0); if (error) { xfs_trans_cancel(tp, 0); xfs_iunlock(ip, XFS_IOLOCK_EXCL); return VN_INACTIVE_CACHE; } error = xfs_trans_reserve(tp, 0, XFS_ITRUNCATE_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_ITRUNCATE_LOG_COUNT); if (error) { /* Don't call itruncate_cleanup */ ASSERT(XFS_FORCED_SHUTDOWN(mp)); xfs_trans_cancel(tp, 0); xfs_iunlock(ip, XFS_IOLOCK_EXCL); return VN_INACTIVE_CACHE; } xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); xfs_trans_ihold(tp, ip); /* * normally, we have to run xfs_itruncate_finish sync. * But if filesystem is wsync and we're in the inactive * path, then we know that nlink == 0, and that the * xaction that made nlink == 0 is permanently committed * since xfs_remove runs as a synchronous transaction. */ error = xfs_itruncate_finish(&tp, ip, 0, XFS_DATA_FORK, (!(mp->m_flags & XFS_MOUNT_WSYNC) ? 1 : 0)); if (error) { xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); return VN_INACTIVE_CACHE; } } else if ((ip->i_d.di_mode & S_IFMT) == S_IFLNK) { /* * If we get an error while cleaning up a * symlink we bail out. */ error = (ip->i_d.di_size > XFS_IFORK_DSIZE(ip)) ? xfs_inactive_symlink_rmt(ip, &tp) : xfs_inactive_symlink_local(ip, &tp); if (error) { ASSERT(tp == NULL); return VN_INACTIVE_CACHE; } xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); xfs_trans_ihold(tp, ip); } else { error = xfs_trans_reserve(tp, 0, XFS_IFREE_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_INACTIVE_LOG_COUNT); if (error) { ASSERT(XFS_FORCED_SHUTDOWN(mp)); xfs_trans_cancel(tp, 0); return VN_INACTIVE_CACHE; } xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); xfs_trans_ijoin(tp, ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); xfs_trans_ihold(tp, ip); } /* * If there are attributes associated with the file * then blow them away now. The code calls a routine * that recursively deconstructs the attribute fork. * We need to just commit the current transaction * because we can't use it for xfs_attr_inactive(). */ if (ip->i_d.di_anextents > 0) { error = xfs_inactive_attrs(ip, &tp); /* * If we got an error, the transaction is already * cancelled, and the inode is unlocked. Just get out. */ if (error) return VN_INACTIVE_CACHE; } else if (ip->i_afp) { xfs_idestroy_fork(ip, XFS_ATTR_FORK); } /* * Free the inode. */ xfs_bmap_init(&free_list, &first_block); error = xfs_ifree(tp, ip, &free_list); if (error) { /* * If we fail to free the inode, shut down. The cancel * might do that, we need to make sure. Otherwise the * inode might be lost for a long time or forever. */ if (!XFS_FORCED_SHUTDOWN(mp)) { cmn_err(CE_NOTE, "xfs_inactive: xfs_ifree() returned an error = %d on %s", error, mp->m_fsname); xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR); } xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT); } else { /* * Credit the quota account(s). The inode is gone. */ xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1); /* * Just ignore errors at this point. There is nothing we can * do except to try to keep going. Make sure it's not a silent * error. */ error = xfs_bmap_finish(&tp, &free_list, &committed); if (error) xfs_fs_cmn_err(CE_NOTE, mp, "xfs_inactive: " "xfs_bmap_finish() returned error %d", error); error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); if (error) xfs_fs_cmn_err(CE_NOTE, mp, "xfs_inactive: " "xfs_trans_commit() returned error %d", error); } /* * Release the dquots held by inode, if any. */ xfs_qm_dqdetach(ip); xfs_iunlock(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL); out: return VN_INACTIVE_CACHE; } /* * Lookups up an inode from "name". If ci_name is not NULL, then a CI match * is allowed, otherwise it has to be an exact match. If a CI match is found, * ci_name->name will point to a the actual name (caller must free) or * will be set to NULL if an exact match is found. */ int xfs_lookup( xfs_inode_t *dp, struct xfs_name *name, xfs_inode_t **ipp, struct xfs_name *ci_name) { xfs_ino_t inum; int error; uint lock_mode; xfs_itrace_entry(dp); if (XFS_FORCED_SHUTDOWN(dp->i_mount)) return XFS_ERROR(EIO); lock_mode = xfs_ilock_map_shared(dp); error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name); xfs_iunlock_map_shared(dp, lock_mode); if (error) goto out; error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp, 0); if (error) goto out_free_name; xfs_itrace_ref(*ipp); return 0; out_free_name: if (ci_name) kmem_free(ci_name->name); out: *ipp = NULL; return error; } int xfs_create( xfs_inode_t *dp, struct xfs_name *name, mode_t mode, xfs_dev_t rdev, xfs_inode_t **ipp, cred_t *credp) { int is_dir = S_ISDIR(mode); struct xfs_mount *mp = dp->i_mount; struct xfs_inode *ip = NULL; struct xfs_trans *tp = NULL; int error; xfs_bmap_free_t free_list; xfs_fsblock_t first_block; boolean_t unlock_dp_on_error = B_FALSE; uint cancel_flags; int committed; xfs_prid_t prid; struct xfs_dquot *udqp = NULL; struct xfs_dquot *gdqp = NULL; uint resblks; uint log_res; uint log_count; xfs_itrace_entry(dp); if (XFS_FORCED_SHUTDOWN(mp)) return XFS_ERROR(EIO); if (DM_EVENT_ENABLED(dp, DM_EVENT_CREATE)) { error = XFS_SEND_NAMESP(mp, DM_EVENT_CREATE, dp, DM_RIGHT_NULL, NULL, DM_RIGHT_NULL, name->name, NULL, mode, 0, 0); if (error) return error; } if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) prid = dp->i_d.di_projid; else prid = dfltprid; /* * Make sure that we have allocated dquot(s) on disk. */ error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid, XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp); if (error) goto std_return; if (is_dir) { rdev = 0; resblks = XFS_MKDIR_SPACE_RES(mp, name->len); log_res = XFS_MKDIR_LOG_RES(mp); log_count = XFS_MKDIR_LOG_COUNT; tp = xfs_trans_alloc(mp, XFS_TRANS_MKDIR); } else { resblks = XFS_CREATE_SPACE_RES(mp, name->len); log_res = XFS_CREATE_LOG_RES(mp); log_count = XFS_CREATE_LOG_COUNT; tp = xfs_trans_alloc(mp, XFS_TRANS_CREATE); } cancel_flags = XFS_TRANS_RELEASE_LOG_RES; /* * Initially assume that the file does not exist and * reserve the resources for that case. If that is not * the case we'll drop the one we have and get a more * appropriate transaction later. */ error = xfs_trans_reserve(tp, resblks, log_res, 0, XFS_TRANS_PERM_LOG_RES, log_count); if (error == ENOSPC) { /* flush outstanding delalloc blocks and retry */ xfs_flush_inodes(dp); error = xfs_trans_reserve(tp, resblks, XFS_CREATE_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_CREATE_LOG_COUNT); } if (error == ENOSPC) { /* No space at all so try a "no-allocation" reservation */ resblks = 0; error = xfs_trans_reserve(tp, 0, log_res, 0, XFS_TRANS_PERM_LOG_RES, log_count); } if (error) { cancel_flags = 0; goto out_trans_cancel; } xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT); unlock_dp_on_error = B_TRUE; /* * Check for directory link count overflow. */ if (is_dir && dp->i_d.di_nlink >= XFS_MAXLINK) { error = XFS_ERROR(EMLINK); goto out_trans_cancel; } xfs_bmap_init(&free_list, &first_block); /* * Reserve disk quota and the inode. */ error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0); if (error) goto out_trans_cancel; error = xfs_dir_canenter(tp, dp, name, resblks); if (error) goto out_trans_cancel; /* * A newly created regular or special file just has one directory * entry pointing to them, but a directory also the "." entry * pointing to itself. */ error = xfs_dir_ialloc(&tp, dp, mode, is_dir ? 2 : 1, rdev, credp, prid, resblks > 0, &ip, &committed); if (error) { if (error == ENOSPC) goto out_trans_cancel; goto out_trans_abort; } /* * At this point, we've gotten a newly allocated inode. * It is locked (and joined to the transaction). */ xfs_itrace_ref(ip); ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); /* * Now we join the directory inode to the transaction. We do not do it * earlier because xfs_dir_ialloc might commit the previous transaction * (and release all the locks). An error from here on will result in * the transaction cancel unlocking dp so don't do it explicitly in the * error path. */ IHOLD(dp); xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); unlock_dp_on_error = B_FALSE; error = xfs_dir_createname(tp, dp, name, ip->i_ino, &first_block, &free_list, resblks ? resblks - XFS_IALLOC_SPACE_RES(mp) : 0); if (error) { ASSERT(error != ENOSPC); goto out_trans_abort; } xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); if (is_dir) { error = xfs_dir_init(tp, ip, dp); if (error) goto out_bmap_cancel; error = xfs_bumplink(tp, dp); if (error) goto out_bmap_cancel; } /* * If this is a synchronous mount, make sure that the * create transaction goes to disk before returning to * the user. */ if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) xfs_trans_set_sync(tp); /* * Attach the dquot(s) to the inodes and modify them incore. * These ids of the inode couldn't have changed since the new * inode has been locked ever since it was created. */ xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp); /* * xfs_trans_commit normally decrements the vnode ref count * when it unlocks the inode. Since we want to return the * vnode to the caller, we bump the vnode ref count now. */ IHOLD(ip); error = xfs_bmap_finish(&tp, &free_list, &committed); if (error) goto out_abort_rele; error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); if (error) { IRELE(ip); goto out_dqrele; } xfs_qm_dqrele(udqp); xfs_qm_dqrele(gdqp); *ipp = ip; /* Fallthrough to std_return with error = 0 */ std_return: if (DM_EVENT_ENABLED(dp, DM_EVENT_POSTCREATE)) { XFS_SEND_NAMESP(mp, DM_EVENT_POSTCREATE, dp, DM_RIGHT_NULL, ip, DM_RIGHT_NULL, name->name, NULL, mode, error, 0); } return error; out_bmap_cancel: xfs_bmap_cancel(&free_list); out_trans_abort: cancel_flags |= XFS_TRANS_ABORT; out_trans_cancel: xfs_trans_cancel(tp, cancel_flags); out_dqrele: xfs_qm_dqrele(udqp); xfs_qm_dqrele(gdqp); if (unlock_dp_on_error) xfs_iunlock(dp, XFS_ILOCK_EXCL); goto std_return; out_abort_rele: /* * Wait until after the current transaction is aborted to * release the inode. This prevents recursive transactions * and deadlocks from xfs_inactive. */ xfs_bmap_cancel(&free_list); cancel_flags |= XFS_TRANS_ABORT; xfs_trans_cancel(tp, cancel_flags); IRELE(ip); unlock_dp_on_error = B_FALSE; goto out_dqrele; } #ifdef DEBUG int xfs_locked_n; int xfs_small_retries; int xfs_middle_retries; int xfs_lots_retries; int xfs_lock_delays; #endif /* * Bump the subclass so xfs_lock_inodes() acquires each lock with * a different value */ static inline int xfs_lock_inumorder(int lock_mode, int subclass) { if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_IOLOCK_SHIFT; if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) lock_mode |= (subclass + XFS_LOCK_INUMORDER) << XFS_ILOCK_SHIFT; return lock_mode; } /* * The following routine will lock n inodes in exclusive mode. * We assume the caller calls us with the inodes in i_ino order. * * We need to detect deadlock where an inode that we lock * is in the AIL and we start waiting for another inode that is locked * by a thread in a long running transaction (such as truncate). This can * result in deadlock since the long running trans might need to wait * for the inode we just locked in order to push the tail and free space * in the log. */ void xfs_lock_inodes( xfs_inode_t **ips, int inodes, uint lock_mode) { int attempts = 0, i, j, try_lock; xfs_log_item_t *lp; ASSERT(ips && (inodes >= 2)); /* we need at least two */ try_lock = 0; i = 0; again: for (; i < inodes; i++) { ASSERT(ips[i]); if (i && (ips[i] == ips[i-1])) /* Already locked */ continue; /* * If try_lock is not set yet, make sure all locked inodes * are not in the AIL. * If any are, set try_lock to be used later. */ if (!try_lock) { for (j = (i - 1); j >= 0 && !try_lock; j--) { lp = (xfs_log_item_t *)ips[j]->i_itemp; if (lp && (lp->li_flags & XFS_LI_IN_AIL)) { try_lock++; } } } /* * If any of the previous locks we have locked is in the AIL, * we must TRY to get the second and subsequent locks. If * we can't get any, we must release all we have * and try again. */ if (try_lock) { /* try_lock must be 0 if i is 0. */ /* * try_lock means we have an inode locked * that is in the AIL. */ ASSERT(i != 0); if (!xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i))) { attempts++; /* * Unlock all previous guys and try again. * xfs_iunlock will try to push the tail * if the inode is in the AIL. */ for(j = i - 1; j >= 0; j--) { /* * Check to see if we've already * unlocked this one. * Not the first one going back, * and the inode ptr is the same. */ if ((j != (i - 1)) && ips[j] == ips[j+1]) continue; xfs_iunlock(ips[j], lock_mode); } if ((attempts % 5) == 0) { delay(1); /* Don't just spin the CPU */ #ifdef DEBUG xfs_lock_delays++; #endif } i = 0; try_lock = 0; goto again; } } else { xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i)); } } #ifdef DEBUG if (attempts) { if (attempts < 5) xfs_small_retries++; else if (attempts < 100) xfs_middle_retries++; else xfs_lots_retries++; } else { xfs_locked_n++; } #endif } /* * xfs_lock_two_inodes() can only be used to lock one type of lock * at a time - the iolock or the ilock, but not both at once. If * we lock both at once, lockdep will report false positives saying * we have violated locking orders. */ void xfs_lock_two_inodes( xfs_inode_t *ip0, xfs_inode_t *ip1, uint lock_mode) { xfs_inode_t *temp; int attempts = 0; xfs_log_item_t *lp; if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) ASSERT((lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) == 0); ASSERT(ip0->i_ino != ip1->i_ino); if (ip0->i_ino > ip1->i_ino) { temp = ip0; ip0 = ip1; ip1 = temp; } again: xfs_ilock(ip0, xfs_lock_inumorder(lock_mode, 0)); /* * If the first lock we have locked is in the AIL, we must TRY to get * the second lock. If we can't get it, we must release the first one * and try again. */ lp = (xfs_log_item_t *)ip0->i_itemp; if (lp && (lp->li_flags & XFS_LI_IN_AIL)) { if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(lock_mode, 1))) { xfs_iunlock(ip0, lock_mode); if ((++attempts % 5) == 0) delay(1); /* Don't just spin the CPU */ goto again; } } else { xfs_ilock(ip1, xfs_lock_inumorder(lock_mode, 1)); } } int xfs_remove( xfs_inode_t *dp, struct xfs_name *name, xfs_inode_t *ip) { xfs_mount_t *mp = dp->i_mount; xfs_trans_t *tp = NULL; int is_dir = S_ISDIR(ip->i_d.di_mode); int error = 0; xfs_bmap_free_t free_list; xfs_fsblock_t first_block; int cancel_flags; int committed; int link_zero; uint resblks; uint log_count; xfs_itrace_entry(dp); xfs_itrace_entry(ip); if (XFS_FORCED_SHUTDOWN(mp)) return XFS_ERROR(EIO); if (DM_EVENT_ENABLED(dp, DM_EVENT_REMOVE)) { error = XFS_SEND_NAMESP(mp, DM_EVENT_REMOVE, dp, DM_RIGHT_NULL, NULL, DM_RIGHT_NULL, name->name, NULL, ip->i_d.di_mode, 0, 0); if (error) return error; } error = xfs_qm_dqattach(dp, 0); if (error) goto std_return; error = xfs_qm_dqattach(ip, 0); if (error) goto std_return; if (is_dir) { tp = xfs_trans_alloc(mp, XFS_TRANS_RMDIR); log_count = XFS_DEFAULT_LOG_COUNT; } else { tp = xfs_trans_alloc(mp, XFS_TRANS_REMOVE); log_count = XFS_REMOVE_LOG_COUNT; } cancel_flags = XFS_TRANS_RELEASE_LOG_RES; /* * We try to get the real space reservation first, * allowing for directory btree deletion(s) implying * possible bmap insert(s). If we can't get the space * reservation then we use 0 instead, and avoid the bmap * btree insert(s) in the directory code by, if the bmap * insert tries to happen, instead trimming the LAST * block from the directory. */ resblks = XFS_REMOVE_SPACE_RES(mp); error = xfs_trans_reserve(tp, resblks, XFS_REMOVE_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, log_count); if (error == ENOSPC) { resblks = 0; error = xfs_trans_reserve(tp, 0, XFS_REMOVE_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, log_count); } if (error) { ASSERT(error != ENOSPC); cancel_flags = 0; goto out_trans_cancel; } xfs_lock_two_inodes(dp, ip, XFS_ILOCK_EXCL); /* * At this point, we've gotten both the directory and the entry * inodes locked. */ IHOLD(ip); xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); IHOLD(dp); xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); /* * If we're removing a directory perform some additional validation. */ if (is_dir) { ASSERT(ip->i_d.di_nlink >= 2); if (ip->i_d.di_nlink != 2) { error = XFS_ERROR(ENOTEMPTY); goto out_trans_cancel; } if (!xfs_dir_isempty(ip)) { error = XFS_ERROR(ENOTEMPTY); goto out_trans_cancel; } } xfs_bmap_init(&free_list, &first_block); error = xfs_dir_removename(tp, dp, name, ip->i_ino, &first_block, &free_list, resblks); if (error) { ASSERT(error != ENOENT); goto out_bmap_cancel; } xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); if (is_dir) { /* * Drop the link from ip's "..". */ error = xfs_droplink(tp, dp); if (error) goto out_bmap_cancel; /* * Drop the "." link from ip to self. */ error = xfs_droplink(tp, ip); if (error) goto out_bmap_cancel; } else { /* * When removing a non-directory we need to log the parent * inode here. For a directory this is done implicitly * by the xfs_droplink call for the ".." entry. */ xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); } /* * Drop the link from dp to ip. */ error = xfs_droplink(tp, ip); if (error) goto out_bmap_cancel; /* * Determine if this is the last link while * we are in the transaction. */ link_zero = (ip->i_d.di_nlink == 0); /* * If this is a synchronous mount, make sure that the * remove transaction goes to disk before returning to * the user. */ if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) xfs_trans_set_sync(tp); error = xfs_bmap_finish(&tp, &free_list, &committed); if (error) goto out_bmap_cancel; error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); if (error) goto std_return; /* * If we are using filestreams, kill the stream association. * If the file is still open it may get a new one but that * will get killed on last close in xfs_close() so we don't * have to worry about that. */ if (!is_dir && link_zero && xfs_inode_is_filestream(ip)) xfs_filestream_deassociate(ip); xfs_itrace_exit(ip); xfs_itrace_exit(dp); std_return: if (DM_EVENT_ENABLED(dp, DM_EVENT_POSTREMOVE)) { XFS_SEND_NAMESP(mp, DM_EVENT_POSTREMOVE, dp, DM_RIGHT_NULL, NULL, DM_RIGHT_NULL, name->name, NULL, ip->i_d.di_mode, error, 0); } return error; out_bmap_cancel: xfs_bmap_cancel(&free_list); cancel_flags |= XFS_TRANS_ABORT; out_trans_cancel: xfs_trans_cancel(tp, cancel_flags); goto std_return; } int xfs_link( xfs_inode_t *tdp, xfs_inode_t *sip, struct xfs_name *target_name) { xfs_mount_t *mp = tdp->i_mount; xfs_trans_t *tp; int error; xfs_bmap_free_t free_list; xfs_fsblock_t first_block; int cancel_flags; int committed; int resblks; xfs_itrace_entry(tdp); xfs_itrace_entry(sip); ASSERT(!S_ISDIR(sip->i_d.di_mode)); if (XFS_FORCED_SHUTDOWN(mp)) return XFS_ERROR(EIO); if (DM_EVENT_ENABLED(tdp, DM_EVENT_LINK)) { error = XFS_SEND_NAMESP(mp, DM_EVENT_LINK, tdp, DM_RIGHT_NULL, sip, DM_RIGHT_NULL, target_name->name, NULL, 0, 0, 0); if (error) return error; } /* Return through std_return after this point. */ error = xfs_qm_dqattach(sip, 0); if (error) goto std_return; error = xfs_qm_dqattach(tdp, 0); if (error) goto std_return; tp = xfs_trans_alloc(mp, XFS_TRANS_LINK); cancel_flags = XFS_TRANS_RELEASE_LOG_RES; resblks = XFS_LINK_SPACE_RES(mp, target_name->len); error = xfs_trans_reserve(tp, resblks, XFS_LINK_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT); if (error == ENOSPC) { resblks = 0; error = xfs_trans_reserve(tp, 0, XFS_LINK_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_LINK_LOG_COUNT); } if (error) { cancel_flags = 0; goto error_return; } xfs_lock_two_inodes(sip, tdp, XFS_ILOCK_EXCL); /* * Increment vnode ref counts since xfs_trans_commit & * xfs_trans_cancel will both unlock the inodes and * decrement the associated ref counts. */ IHOLD(sip); IHOLD(tdp); xfs_trans_ijoin(tp, sip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL); /* * If the source has too many links, we can't make any more to it. */ if (sip->i_d.di_nlink >= XFS_MAXLINK) { error = XFS_ERROR(EMLINK); goto error_return; } /* * If we are using project inheritance, we only allow hard link * creation in our tree when the project IDs are the same; else * the tree quota mechanism could be circumvented. */ if (unlikely((tdp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) && (tdp->i_d.di_projid != sip->i_d.di_projid))) { error = XFS_ERROR(EXDEV); goto error_return; } error = xfs_dir_canenter(tp, tdp, target_name, resblks); if (error) goto error_return; xfs_bmap_init(&free_list, &first_block); error = xfs_dir_createname(tp, tdp, target_name, sip->i_ino, &first_block, &free_list, resblks); if (error) goto abort_return; xfs_ichgtime(tdp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); xfs_trans_log_inode(tp, tdp, XFS_ILOG_CORE); error = xfs_bumplink(tp, sip); if (error) goto abort_return; /* * If this is a synchronous mount, make sure that the * link transaction goes to disk before returning to * the user. */ if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { xfs_trans_set_sync(tp); } error = xfs_bmap_finish (&tp, &free_list, &committed); if (error) { xfs_bmap_cancel(&free_list); goto abort_return; } error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); if (error) goto std_return; /* Fall through to std_return with error = 0. */ std_return: if (DM_EVENT_ENABLED(sip, DM_EVENT_POSTLINK)) { (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTLINK, tdp, DM_RIGHT_NULL, sip, DM_RIGHT_NULL, target_name->name, NULL, 0, error, 0); } return error; abort_return: cancel_flags |= XFS_TRANS_ABORT; /* FALLTHROUGH */ error_return: xfs_trans_cancel(tp, cancel_flags); goto std_return; } int xfs_symlink( xfs_inode_t *dp, struct xfs_name *link_name, const char *target_path, mode_t mode, xfs_inode_t **ipp, cred_t *credp) { xfs_mount_t *mp = dp->i_mount; xfs_trans_t *tp; xfs_inode_t *ip; int error; int pathlen; xfs_bmap_free_t free_list; xfs_fsblock_t first_block; boolean_t unlock_dp_on_error = B_FALSE; uint cancel_flags; int committed; xfs_fileoff_t first_fsb; xfs_filblks_t fs_blocks; int nmaps; xfs_bmbt_irec_t mval[SYMLINK_MAPS]; xfs_daddr_t d; const char *cur_chunk; int byte_cnt; int n; xfs_buf_t *bp; xfs_prid_t prid; struct xfs_dquot *udqp, *gdqp; uint resblks; *ipp = NULL; error = 0; ip = NULL; tp = NULL; xfs_itrace_entry(dp); if (XFS_FORCED_SHUTDOWN(mp)) return XFS_ERROR(EIO); /* * Check component lengths of the target path name. */ pathlen = strlen(target_path); if (pathlen >= MAXPATHLEN) /* total string too long */ return XFS_ERROR(ENAMETOOLONG); if (DM_EVENT_ENABLED(dp, DM_EVENT_SYMLINK)) { error = XFS_SEND_NAMESP(mp, DM_EVENT_SYMLINK, dp, DM_RIGHT_NULL, NULL, DM_RIGHT_NULL, link_name->name, target_path, 0, 0, 0); if (error) return error; } /* Return through std_return after this point. */ udqp = gdqp = NULL; if (dp->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) prid = dp->i_d.di_projid; else prid = (xfs_prid_t)dfltprid; /* * Make sure that we have allocated dquot(s) on disk. */ error = xfs_qm_vop_dqalloc(dp, current_fsuid(), current_fsgid(), prid, XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT, &udqp, &gdqp); if (error) goto std_return; tp = xfs_trans_alloc(mp, XFS_TRANS_SYMLINK); cancel_flags = XFS_TRANS_RELEASE_LOG_RES; /* * The symlink will fit into the inode data fork? * There can't be any attributes so we get the whole variable part. */ if (pathlen <= XFS_LITINO(mp)) fs_blocks = 0; else fs_blocks = XFS_B_TO_FSB(mp, pathlen); resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks); error = xfs_trans_reserve(tp, resblks, XFS_SYMLINK_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT); if (error == ENOSPC && fs_blocks == 0) { resblks = 0; error = xfs_trans_reserve(tp, 0, XFS_SYMLINK_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_SYMLINK_LOG_COUNT); } if (error) { cancel_flags = 0; goto error_return; } xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT); unlock_dp_on_error = B_TRUE; /* * Check whether the directory allows new symlinks or not. */ if (dp->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) { error = XFS_ERROR(EPERM); goto error_return; } /* * Reserve disk quota : blocks and inode. */ error = xfs_trans_reserve_quota(tp, mp, udqp, gdqp, resblks, 1, 0); if (error) goto error_return; /* * Check for ability to enter directory entry, if no space reserved. */ error = xfs_dir_canenter(tp, dp, link_name, resblks); if (error) goto error_return; /* * Initialize the bmap freelist prior to calling either * bmapi or the directory create code. */ xfs_bmap_init(&free_list, &first_block); /* * Allocate an inode for the symlink. */ error = xfs_dir_ialloc(&tp, dp, S_IFLNK | (mode & ~S_IFMT), 1, 0, credp, prid, resblks > 0, &ip, NULL); if (error) { if (error == ENOSPC) goto error_return; goto error1; } xfs_itrace_ref(ip); /* * An error after we've joined dp to the transaction will result in the * transaction cancel unlocking dp so don't do it explicitly in the * error path. */ IHOLD(dp); xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL); unlock_dp_on_error = B_FALSE; /* * Also attach the dquot(s) to it, if applicable. */ xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp); if (resblks) resblks -= XFS_IALLOC_SPACE_RES(mp); /* * If the symlink will fit into the inode, write it inline. */ if (pathlen <= XFS_IFORK_DSIZE(ip)) { xfs_idata_realloc(ip, pathlen, XFS_DATA_FORK); memcpy(ip->i_df.if_u1.if_data, target_path, pathlen); ip->i_d.di_size = pathlen; /* * The inode was initially created in extent format. */ ip->i_df.if_flags &= ~(XFS_IFEXTENTS | XFS_IFBROOT); ip->i_df.if_flags |= XFS_IFINLINE; ip->i_d.di_format = XFS_DINODE_FMT_LOCAL; xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE); } else { first_fsb = 0; nmaps = SYMLINK_MAPS; error = xfs_bmapi(tp, ip, first_fsb, fs_blocks, XFS_BMAPI_WRITE | XFS_BMAPI_METADATA, &first_block, resblks, mval, &nmaps, &free_list, NULL); if (error) { goto error1; } if (resblks) resblks -= fs_blocks; ip->i_d.di_size = pathlen; xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); cur_chunk = target_path; for (n = 0; n < nmaps; n++) { d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock); byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount); bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d, BTOBB(byte_cnt), 0); ASSERT(bp && !XFS_BUF_GETERROR(bp)); if (pathlen < byte_cnt) { byte_cnt = pathlen; } pathlen -= byte_cnt; memcpy(XFS_BUF_PTR(bp), cur_chunk, byte_cnt); cur_chunk += byte_cnt; xfs_trans_log_buf(tp, bp, 0, byte_cnt - 1); } } /* * Create the directory entry for the symlink. */ error = xfs_dir_createname(tp, dp, link_name, ip->i_ino, &first_block, &free_list, resblks); if (error) goto error1; xfs_ichgtime(dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); /* * If this is a synchronous mount, make sure that the * symlink transaction goes to disk before returning to * the user. */ if (mp->m_flags & (XFS_MOUNT_WSYNC|XFS_MOUNT_DIRSYNC)) { xfs_trans_set_sync(tp); } /* * xfs_trans_commit normally decrements the vnode ref count * when it unlocks the inode. Since we want to return the * vnode to the caller, we bump the vnode ref count now. */ IHOLD(ip); error = xfs_bmap_finish(&tp, &free_list, &committed); if (error) { goto error2; } error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); xfs_qm_dqrele(udqp); xfs_qm_dqrele(gdqp); /* Fall through to std_return with error = 0 or errno from * xfs_trans_commit */ std_return: if (DM_EVENT_ENABLED(dp, DM_EVENT_POSTSYMLINK)) { (void) XFS_SEND_NAMESP(mp, DM_EVENT_POSTSYMLINK, dp, DM_RIGHT_NULL, error ? NULL : ip, DM_RIGHT_NULL, link_name->name, target_path, 0, error, 0); } if (!error) *ipp = ip; return error; error2: IRELE(ip); error1: xfs_bmap_cancel(&free_list); cancel_flags |= XFS_TRANS_ABORT; error_return: xfs_trans_cancel(tp, cancel_flags); xfs_qm_dqrele(udqp); xfs_qm_dqrele(gdqp); if (unlock_dp_on_error) xfs_iunlock(dp, XFS_ILOCK_EXCL); goto std_return; } int xfs_set_dmattrs( xfs_inode_t *ip, u_int evmask, u_int16_t state) { xfs_mount_t *mp = ip->i_mount; xfs_trans_t *tp; int error; if (!capable(CAP_SYS_ADMIN)) return XFS_ERROR(EPERM); if (XFS_FORCED_SHUTDOWN(mp)) return XFS_ERROR(EIO); tp = xfs_trans_alloc(mp, XFS_TRANS_SET_DMATTRS); error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES (mp), 0, 0, 0); if (error) { xfs_trans_cancel(tp, 0); return error; } xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); ip->i_d.di_dmevmask = evmask; ip->i_d.di_dmstate = state; xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); IHOLD(ip); error = xfs_trans_commit(tp, 0); return error; } int xfs_reclaim( xfs_inode_t *ip) { xfs_itrace_entry(ip); ASSERT(!VN_MAPPED(VFS_I(ip))); /* bad inode, get out here ASAP */ if (is_bad_inode(VFS_I(ip))) { xfs_ireclaim(ip); return 0; } xfs_ioend_wait(ip); ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0); /* * Make sure the atime in the XFS inode is correct before freeing the * Linux inode. */ xfs_synchronize_atime(ip); /* * If we have nothing to flush with this inode then complete the * teardown now, otherwise break the link between the xfs inode and the * linux inode and clean up the xfs inode later. This avoids flushing * the inode to disk during the delete operation itself. * * When breaking the link, we need to set the XFS_IRECLAIMABLE flag * first to ensure that xfs_iunpin() will never see an xfs inode * that has a linux inode being reclaimed. Synchronisation is provided * by the i_flags_lock. */ if (!ip->i_update_core && (ip->i_itemp == NULL)) { xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_iflock(ip); xfs_iflags_set(ip, XFS_IRECLAIMABLE); return xfs_reclaim_inode(ip, 1, XFS_IFLUSH_DELWRI_ELSE_SYNC); } xfs_inode_set_reclaim_tag(ip); return 0; } /* * xfs_alloc_file_space() * This routine allocates disk space for the given file. * * If alloc_type == 0, this request is for an ALLOCSP type * request which will change the file size. In this case, no * DMAPI event will be generated by the call. A TRUNCATE event * will be generated later by xfs_setattr. * * If alloc_type != 0, this request is for a RESVSP type * request, and a DMAPI DM_EVENT_WRITE will be generated if the * lower block boundary byte address is less than the file's * length. * * RETURNS: * 0 on success * errno on error * */ STATIC int xfs_alloc_file_space( xfs_inode_t *ip, xfs_off_t offset, xfs_off_t len, int alloc_type, int attr_flags) { xfs_mount_t *mp = ip->i_mount; xfs_off_t count; xfs_filblks_t allocated_fsb; xfs_filblks_t allocatesize_fsb; xfs_extlen_t extsz, temp; xfs_fileoff_t startoffset_fsb; xfs_fsblock_t firstfsb; int nimaps; int bmapi_flag; int quota_flag; int rt; xfs_trans_t *tp; xfs_bmbt_irec_t imaps[1], *imapp; xfs_bmap_free_t free_list; uint qblocks, resblks, resrtextents; int committed; int error; xfs_itrace_entry(ip); if (XFS_FORCED_SHUTDOWN(mp)) return XFS_ERROR(EIO); error = xfs_qm_dqattach(ip, 0); if (error) return error; if (len <= 0) return XFS_ERROR(EINVAL); rt = XFS_IS_REALTIME_INODE(ip); extsz = xfs_get_extsz_hint(ip); count = len; imapp = &imaps[0]; nimaps = 1; bmapi_flag = XFS_BMAPI_WRITE | (alloc_type ? XFS_BMAPI_PREALLOC : 0); startoffset_fsb = XFS_B_TO_FSBT(mp, offset); allocatesize_fsb = XFS_B_TO_FSB(mp, count); /* Generate a DMAPI event if needed. */ if (alloc_type != 0 && offset < ip->i_size && (attr_flags & XFS_ATTR_DMI) == 0 && DM_EVENT_ENABLED(ip, DM_EVENT_WRITE)) { xfs_off_t end_dmi_offset; end_dmi_offset = offset+len; if (end_dmi_offset > ip->i_size) end_dmi_offset = ip->i_size; error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, ip, offset, end_dmi_offset - offset, 0, NULL); if (error) return error; } /* * Allocate file space until done or until there is an error */ retry: while (allocatesize_fsb && !error) { xfs_fileoff_t s, e; /* * Determine space reservations for data/realtime. */ if (unlikely(extsz)) { s = startoffset_fsb; do_div(s, extsz); s *= extsz; e = startoffset_fsb + allocatesize_fsb; if ((temp = do_mod(startoffset_fsb, extsz))) e += temp; if ((temp = do_mod(e, extsz))) e += extsz - temp; } else { s = 0; e = allocatesize_fsb; } if (unlikely(rt)) { resrtextents = qblocks = (uint)(e - s); resrtextents /= mp->m_sb.sb_rextsize; resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); quota_flag = XFS_QMOPT_RES_RTBLKS; } else { resrtextents = 0; resblks = qblocks = \ XFS_DIOSTRAT_SPACE_RES(mp, (uint)(e - s)); quota_flag = XFS_QMOPT_RES_REGBLKS; } /* * Allocate and setup the transaction. */ tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); error = xfs_trans_reserve(tp, resblks, XFS_WRITE_LOG_RES(mp), resrtextents, XFS_TRANS_PERM_LOG_RES, XFS_WRITE_LOG_COUNT); /* * Check for running out of space */ if (error) { /* * Free the transaction structure. */ ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp)); xfs_trans_cancel(tp, 0); break; } xfs_ilock(ip, XFS_ILOCK_EXCL); error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, 0, quota_flag); if (error) goto error1; xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); xfs_trans_ihold(tp, ip); /* * Issue the xfs_bmapi() call to allocate the blocks */ xfs_bmap_init(&free_list, &firstfsb); error = xfs_bmapi(tp, ip, startoffset_fsb, allocatesize_fsb, bmapi_flag, &firstfsb, 0, imapp, &nimaps, &free_list, NULL); if (error) { goto error0; } /* * Complete the transaction */ error = xfs_bmap_finish(&tp, &free_list, &committed); if (error) { goto error0; } error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); xfs_iunlock(ip, XFS_ILOCK_EXCL); if (error) { break; } allocated_fsb = imapp->br_blockcount; if (nimaps == 0) { error = XFS_ERROR(ENOSPC); break; } startoffset_fsb += allocated_fsb; allocatesize_fsb -= allocated_fsb; } dmapi_enospc_check: if (error == ENOSPC && (attr_flags & XFS_ATTR_DMI) == 0 && DM_EVENT_ENABLED(ip, DM_EVENT_NOSPACE)) { error = XFS_SEND_NAMESP(mp, DM_EVENT_NOSPACE, ip, DM_RIGHT_NULL, ip, DM_RIGHT_NULL, NULL, NULL, 0, 0, 0); /* Delay flag intentionally unused */ if (error == 0) goto retry; /* Maybe DMAPI app. has made space */ /* else fall through with error from XFS_SEND_DATA */ } return error; error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ xfs_bmap_cancel(&free_list); xfs_trans_unreserve_quota_nblks(tp, ip, qblocks, 0, quota_flag); error1: /* Just cancel transaction */ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); xfs_iunlock(ip, XFS_ILOCK_EXCL); goto dmapi_enospc_check; } /* * Zero file bytes between startoff and endoff inclusive. * The iolock is held exclusive and no blocks are buffered. * * This function is used by xfs_free_file_space() to zero * partial blocks when the range to free is not block aligned. * When unreserving space with boundaries that are not block * aligned we round up the start and round down the end * boundaries and then use this function to zero the parts of * the blocks that got dropped during the rounding. */ STATIC int xfs_zero_remaining_bytes( xfs_inode_t *ip, xfs_off_t startoff, xfs_off_t endoff) { xfs_bmbt_irec_t imap; xfs_fileoff_t offset_fsb; xfs_off_t lastoffset; xfs_off_t offset; xfs_buf_t *bp; xfs_mount_t *mp = ip->i_mount; int nimap; int error = 0; /* * Avoid doing I/O beyond eof - it's not necessary * since nothing can read beyond eof. The space will * be zeroed when the file is extended anyway. */ if (startoff >= ip->i_size) return 0; if (endoff > ip->i_size) endoff = ip->i_size; bp = xfs_buf_get_noaddr(mp->m_sb.sb_blocksize, XFS_IS_REALTIME_INODE(ip) ? mp->m_rtdev_targp : mp->m_ddev_targp); if (!bp) return XFS_ERROR(ENOMEM); for (offset = startoff; offset <= endoff; offset = lastoffset + 1) { offset_fsb = XFS_B_TO_FSBT(mp, offset); nimap = 1; error = xfs_bmapi(NULL, ip, offset_fsb, 1, 0, NULL, 0, &imap, &nimap, NULL, NULL); if (error || nimap < 1) break; ASSERT(imap.br_blockcount >= 1); ASSERT(imap.br_startoff == offset_fsb); lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1; if (lastoffset > endoff) lastoffset = endoff; if (imap.br_startblock == HOLESTARTBLOCK) continue; ASSERT(imap.br_startblock != DELAYSTARTBLOCK); if (imap.br_state == XFS_EXT_UNWRITTEN) continue; XFS_BUF_UNDONE(bp); XFS_BUF_UNWRITE(bp); XFS_BUF_READ(bp); XFS_BUF_SET_ADDR(bp, xfs_fsb_to_db(ip, imap.br_startblock)); xfsbdstrat(mp, bp); error = xfs_iowait(bp); if (error) { xfs_ioerror_alert("xfs_zero_remaining_bytes(read)", mp, bp, XFS_BUF_ADDR(bp)); break; } memset(XFS_BUF_PTR(bp) + (offset - XFS_FSB_TO_B(mp, imap.br_startoff)), 0, lastoffset - offset + 1); XFS_BUF_UNDONE(bp); XFS_BUF_UNREAD(bp); XFS_BUF_WRITE(bp); xfsbdstrat(mp, bp); error = xfs_iowait(bp); if (error) { xfs_ioerror_alert("xfs_zero_remaining_bytes(write)", mp, bp, XFS_BUF_ADDR(bp)); break; } } xfs_buf_free(bp); return error; } /* * xfs_free_file_space() * This routine frees disk space for the given file. * * This routine is only called by xfs_change_file_space * for an UNRESVSP type call. * * RETURNS: * 0 on success * errno on error * */ STATIC int xfs_free_file_space( xfs_inode_t *ip, xfs_off_t offset, xfs_off_t len, int attr_flags) { int committed; int done; xfs_off_t end_dmi_offset; xfs_fileoff_t endoffset_fsb; int error; xfs_fsblock_t firstfsb; xfs_bmap_free_t free_list; xfs_bmbt_irec_t imap; xfs_off_t ioffset; xfs_extlen_t mod=0; xfs_mount_t *mp; int nimap; uint resblks; uint rounding; int rt; xfs_fileoff_t startoffset_fsb; xfs_trans_t *tp; int need_iolock = 1; mp = ip->i_mount; xfs_itrace_entry(ip); error = xfs_qm_dqattach(ip, 0); if (error) return error; error = 0; if (len <= 0) /* if nothing being freed */ return error; rt = XFS_IS_REALTIME_INODE(ip); startoffset_fsb = XFS_B_TO_FSB(mp, offset); end_dmi_offset = offset + len; endoffset_fsb = XFS_B_TO_FSBT(mp, end_dmi_offset); if (offset < ip->i_size && (attr_flags & XFS_ATTR_DMI) == 0 && DM_EVENT_ENABLED(ip, DM_EVENT_WRITE)) { if (end_dmi_offset > ip->i_size) end_dmi_offset = ip->i_size; error = XFS_SEND_DATA(mp, DM_EVENT_WRITE, ip, offset, end_dmi_offset - offset, AT_DELAY_FLAG(attr_flags), NULL); if (error) return error; } if (attr_flags & XFS_ATTR_NOLOCK) need_iolock = 0; if (need_iolock) { xfs_ilock(ip, XFS_IOLOCK_EXCL); /* wait for the completion of any pending DIOs */ xfs_ioend_wait(ip); } rounding = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE); ioffset = offset & ~(rounding - 1); if (VN_CACHED(VFS_I(ip)) != 0) { xfs_inval_cached_trace(ip, ioffset, -1, ioffset, -1); error = xfs_flushinval_pages(ip, ioffset, -1, FI_REMAPF_LOCKED); if (error) goto out_unlock_iolock; } /* * Need to zero the stuff we're not freeing, on disk. * If it's a realtime file & can't use unwritten extents then we * actually need to zero the extent edges. Otherwise xfs_bunmapi * will take care of it for us. */ if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) { nimap = 1; error = xfs_bmapi(NULL, ip, startoffset_fsb, 1, 0, NULL, 0, &imap, &nimap, NULL, NULL); if (error) goto out_unlock_iolock; ASSERT(nimap == 0 || nimap == 1); if (nimap && imap.br_startblock != HOLESTARTBLOCK) { xfs_daddr_t block; ASSERT(imap.br_startblock != DELAYSTARTBLOCK); block = imap.br_startblock; mod = do_div(block, mp->m_sb.sb_rextsize); if (mod) startoffset_fsb += mp->m_sb.sb_rextsize - mod; } nimap = 1; error = xfs_bmapi(NULL, ip, endoffset_fsb - 1, 1, 0, NULL, 0, &imap, &nimap, NULL, NULL); if (error) goto out_unlock_iolock; ASSERT(nimap == 0 || nimap == 1); if (nimap && imap.br_startblock != HOLESTARTBLOCK) { ASSERT(imap.br_startblock != DELAYSTARTBLOCK); mod++; if (mod && (mod != mp->m_sb.sb_rextsize)) endoffset_fsb -= mod; } } if ((done = (endoffset_fsb <= startoffset_fsb))) /* * One contiguous piece to clear */ error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1); else { /* * Some full blocks, possibly two pieces to clear */ if (offset < XFS_FSB_TO_B(mp, startoffset_fsb)) error = xfs_zero_remaining_bytes(ip, offset, XFS_FSB_TO_B(mp, startoffset_fsb) - 1); if (!error && XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len) error = xfs_zero_remaining_bytes(ip, XFS_FSB_TO_B(mp, endoffset_fsb), offset + len - 1); } /* * free file space until done or until there is an error */ resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); while (!error && !done) { /* * allocate and setup the transaction. Allow this * transaction to dip into the reserve blocks to ensure * the freeing of the space succeeds at ENOSPC. */ tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); tp->t_flags |= XFS_TRANS_RESERVE; error = xfs_trans_reserve(tp, resblks, XFS_WRITE_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_WRITE_LOG_COUNT); /* * check for running out of space */ if (error) { /* * Free the transaction structure. */ ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp)); xfs_trans_cancel(tp, 0); break; } xfs_ilock(ip, XFS_ILOCK_EXCL); error = xfs_trans_reserve_quota(tp, mp, ip->i_udquot, ip->i_gdquot, resblks, 0, XFS_QMOPT_RES_REGBLKS); if (error) goto error1; xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); xfs_trans_ihold(tp, ip); /* * issue the bunmapi() call to free the blocks */ xfs_bmap_init(&free_list, &firstfsb); error = xfs_bunmapi(tp, ip, startoffset_fsb, endoffset_fsb - startoffset_fsb, 0, 2, &firstfsb, &free_list, NULL, &done); if (error) { goto error0; } /* * complete the transaction */ error = xfs_bmap_finish(&tp, &free_list, &committed); if (error) { goto error0; } error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); xfs_iunlock(ip, XFS_ILOCK_EXCL); } out_unlock_iolock: if (need_iolock) xfs_iunlock(ip, XFS_IOLOCK_EXCL); return error; error0: xfs_bmap_cancel(&free_list); error1: xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); xfs_iunlock(ip, need_iolock ? (XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL) : XFS_ILOCK_EXCL); return error; } /* * xfs_change_file_space() * This routine allocates or frees disk space for the given file. * The user specified parameters are checked for alignment and size * limitations. * * RETURNS: * 0 on success * errno on error * */ int xfs_change_file_space( xfs_inode_t *ip, int cmd, xfs_flock64_t *bf, xfs_off_t offset, int attr_flags) { xfs_mount_t *mp = ip->i_mount; int clrprealloc; int error; xfs_fsize_t fsize; int setprealloc; xfs_off_t startoffset; xfs_off_t llen; xfs_trans_t *tp; struct iattr iattr; xfs_itrace_entry(ip); if (!S_ISREG(ip->i_d.di_mode)) return XFS_ERROR(EINVAL); switch (bf->l_whence) { case 0: /*SEEK_SET*/ break; case 1: /*SEEK_CUR*/ bf->l_start += offset; break; case 2: /*SEEK_END*/ bf->l_start += ip->i_size; break; default: return XFS_ERROR(EINVAL); } llen = bf->l_len > 0 ? bf->l_len - 1 : bf->l_len; if ( (bf->l_start < 0) || (bf->l_start > XFS_MAXIOFFSET(mp)) || (bf->l_start + llen < 0) || (bf->l_start + llen > XFS_MAXIOFFSET(mp))) return XFS_ERROR(EINVAL); bf->l_whence = 0; startoffset = bf->l_start; fsize = ip->i_size; /* * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve * file space. * These calls do NOT zero the data space allocated to the file, * nor do they change the file size. * * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file * space. * These calls cause the new file data to be zeroed and the file * size to be changed. */ setprealloc = clrprealloc = 0; switch (cmd) { case XFS_IOC_RESVSP: case XFS_IOC_RESVSP64: error = xfs_alloc_file_space(ip, startoffset, bf->l_len, 1, attr_flags); if (error) return error; setprealloc = 1; break; case XFS_IOC_UNRESVSP: case XFS_IOC_UNRESVSP64: if ((error = xfs_free_file_space(ip, startoffset, bf->l_len, attr_flags))) return error; break; case XFS_IOC_ALLOCSP: case XFS_IOC_ALLOCSP64: case XFS_IOC_FREESP: case XFS_IOC_FREESP64: if (startoffset > fsize) { error = xfs_alloc_file_space(ip, fsize, startoffset - fsize, 0, attr_flags); if (error) break; } iattr.ia_valid = ATTR_SIZE; iattr.ia_size = startoffset; error = xfs_setattr(ip, &iattr, attr_flags); if (error) return error; clrprealloc = 1; break; default: ASSERT(0); return XFS_ERROR(EINVAL); } /* * update the inode timestamp, mode, and prealloc flag bits */ tp = xfs_trans_alloc(mp, XFS_TRANS_WRITEID); if ((error = xfs_trans_reserve(tp, 0, XFS_WRITEID_LOG_RES(mp), 0, 0, 0))) { /* ASSERT(0); */ xfs_trans_cancel(tp, 0); return error; } xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); xfs_trans_ihold(tp, ip); if ((attr_flags & XFS_ATTR_DMI) == 0) { ip->i_d.di_mode &= ~S_ISUID; /* * Note that we don't have to worry about mandatory * file locking being disabled here because we only * clear the S_ISGID bit if the Group execute bit is * on, but if it was on then mandatory locking wouldn't * have been enabled. */ if (ip->i_d.di_mode & S_IXGRP) ip->i_d.di_mode &= ~S_ISGID; xfs_ichgtime(ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); } if (setprealloc) ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC; else if (clrprealloc) ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC; xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); xfs_trans_set_sync(tp); error = xfs_trans_commit(tp, 0); xfs_iunlock(ip, XFS_ILOCK_EXCL); return error; }