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Diffstat (limited to 'ANDROID_3.4.5/fs/xfs/xfs_dfrag.c')
-rw-r--r--ANDROID_3.4.5/fs/xfs/xfs_dfrag.c454
1 files changed, 454 insertions, 0 deletions
diff --git a/ANDROID_3.4.5/fs/xfs/xfs_dfrag.c b/ANDROID_3.4.5/fs/xfs/xfs_dfrag.c
new file mode 100644
index 00000000..1137bbc5
--- /dev/null
+++ b/ANDROID_3.4.5/fs/xfs/xfs_dfrag.c
@@ -0,0 +1,454 @@
+/*
+ * 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_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_inode_item.h"
+#include "xfs_bmap.h"
+#include "xfs_itable.h"
+#include "xfs_dfrag.h"
+#include "xfs_error.h"
+#include "xfs_vnodeops.h"
+#include "xfs_trace.h"
+
+
+static int xfs_swap_extents(
+ xfs_inode_t *ip, /* target inode */
+ xfs_inode_t *tip, /* tmp inode */
+ xfs_swapext_t *sxp);
+
+/*
+ * ioctl interface for swapext
+ */
+int
+xfs_swapext(
+ xfs_swapext_t *sxp)
+{
+ xfs_inode_t *ip, *tip;
+ struct file *file, *tmp_file;
+ int error = 0;
+
+ /* Pull information for the target fd */
+ file = fget((int)sxp->sx_fdtarget);
+ if (!file) {
+ error = XFS_ERROR(EINVAL);
+ goto out;
+ }
+
+ if (!(file->f_mode & FMODE_WRITE) ||
+ !(file->f_mode & FMODE_READ) ||
+ (file->f_flags & O_APPEND)) {
+ error = XFS_ERROR(EBADF);
+ goto out_put_file;
+ }
+
+ tmp_file = fget((int)sxp->sx_fdtmp);
+ if (!tmp_file) {
+ error = XFS_ERROR(EINVAL);
+ goto out_put_file;
+ }
+
+ if (!(tmp_file->f_mode & FMODE_WRITE) ||
+ !(tmp_file->f_mode & FMODE_READ) ||
+ (tmp_file->f_flags & O_APPEND)) {
+ error = XFS_ERROR(EBADF);
+ goto out_put_tmp_file;
+ }
+
+ if (IS_SWAPFILE(file->f_path.dentry->d_inode) ||
+ IS_SWAPFILE(tmp_file->f_path.dentry->d_inode)) {
+ error = XFS_ERROR(EINVAL);
+ goto out_put_tmp_file;
+ }
+
+ ip = XFS_I(file->f_path.dentry->d_inode);
+ tip = XFS_I(tmp_file->f_path.dentry->d_inode);
+
+ if (ip->i_mount != tip->i_mount) {
+ error = XFS_ERROR(EINVAL);
+ goto out_put_tmp_file;
+ }
+
+ if (ip->i_ino == tip->i_ino) {
+ error = XFS_ERROR(EINVAL);
+ goto out_put_tmp_file;
+ }
+
+ if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
+ error = XFS_ERROR(EIO);
+ goto out_put_tmp_file;
+ }
+
+ error = xfs_swap_extents(ip, tip, sxp);
+
+ out_put_tmp_file:
+ fput(tmp_file);
+ out_put_file:
+ fput(file);
+ out:
+ return error;
+}
+
+/*
+ * We need to check that the format of the data fork in the temporary inode is
+ * valid for the target inode before doing the swap. This is not a problem with
+ * attr1 because of the fixed fork offset, but attr2 has a dynamically sized
+ * data fork depending on the space the attribute fork is taking so we can get
+ * invalid formats on the target inode.
+ *
+ * E.g. target has space for 7 extents in extent format, temp inode only has
+ * space for 6. If we defragment down to 7 extents, then the tmp format is a
+ * btree, but when swapped it needs to be in extent format. Hence we can't just
+ * blindly swap data forks on attr2 filesystems.
+ *
+ * Note that we check the swap in both directions so that we don't end up with
+ * a corrupt temporary inode, either.
+ *
+ * Note that fixing the way xfs_fsr sets up the attribute fork in the source
+ * inode will prevent this situation from occurring, so all we do here is
+ * reject and log the attempt. basically we are putting the responsibility on
+ * userspace to get this right.
+ */
+static int
+xfs_swap_extents_check_format(
+ xfs_inode_t *ip, /* target inode */
+ xfs_inode_t *tip) /* tmp inode */
+{
+
+ /* Should never get a local format */
+ if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL ||
+ tip->i_d.di_format == XFS_DINODE_FMT_LOCAL)
+ return EINVAL;
+
+ /*
+ * if the target inode has less extents that then temporary inode then
+ * why did userspace call us?
+ */
+ if (ip->i_d.di_nextents < tip->i_d.di_nextents)
+ return EINVAL;
+
+ /*
+ * if the target inode is in extent form and the temp inode is in btree
+ * form then we will end up with the target inode in the wrong format
+ * as we already know there are less extents in the temp inode.
+ */
+ if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
+ tip->i_d.di_format == XFS_DINODE_FMT_BTREE)
+ return EINVAL;
+
+ /* Check temp in extent form to max in target */
+ if (tip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) >
+ XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK))
+ return EINVAL;
+
+ /* Check target in extent form to max in temp */
+ if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
+ XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) >
+ XFS_IFORK_MAXEXT(tip, XFS_DATA_FORK))
+ return EINVAL;
+
+ /*
+ * If we are in a btree format, check that the temp root block will fit
+ * in the target and that it has enough extents to be in btree format
+ * in the target.
+ *
+ * Note that we have to be careful to allow btree->extent conversions
+ * (a common defrag case) which will occur when the temp inode is in
+ * extent format...
+ */
+ if (tip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
+ if (XFS_IFORK_BOFF(ip) &&
+ tip->i_df.if_broot_bytes > XFS_IFORK_BOFF(ip))
+ return EINVAL;
+ if (XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) <=
+ XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK))
+ return EINVAL;
+ }
+
+ /* Reciprocal target->temp btree format checks */
+ if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
+ if (XFS_IFORK_BOFF(tip) &&
+ ip->i_df.if_broot_bytes > XFS_IFORK_BOFF(tip))
+ return EINVAL;
+
+ if (XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) <=
+ XFS_IFORK_MAXEXT(tip, XFS_DATA_FORK))
+ return EINVAL;
+ }
+
+ return 0;
+}
+
+static int
+xfs_swap_extents(
+ xfs_inode_t *ip, /* target inode */
+ xfs_inode_t *tip, /* tmp inode */
+ xfs_swapext_t *sxp)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ xfs_trans_t *tp;
+ xfs_bstat_t *sbp = &sxp->sx_stat;
+ xfs_ifork_t *tempifp, *ifp, *tifp;
+ int src_log_flags, target_log_flags;
+ int error = 0;
+ int aforkblks = 0;
+ int taforkblks = 0;
+ __uint64_t tmp;
+
+ tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
+ if (!tempifp) {
+ error = XFS_ERROR(ENOMEM);
+ goto out;
+ }
+
+ /*
+ * we have to do two separate lock calls here to keep lockdep
+ * happy. If we try to get all the locks in one call, lock will
+ * report false positives when we drop the ILOCK and regain them
+ * below.
+ */
+ xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL);
+ xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
+
+ /* Verify that both files have the same format */
+ if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
+ error = XFS_ERROR(EINVAL);
+ goto out_unlock;
+ }
+
+ /* Verify both files are either real-time or non-realtime */
+ if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) {
+ error = XFS_ERROR(EINVAL);
+ goto out_unlock;
+ }
+
+ if (VN_CACHED(VFS_I(tip)) != 0) {
+ error = xfs_flushinval_pages(tip, 0, -1,
+ FI_REMAPF_LOCKED);
+ if (error)
+ goto out_unlock;
+ }
+
+ /* Verify O_DIRECT for ftmp */
+ if (VN_CACHED(VFS_I(tip)) != 0) {
+ error = XFS_ERROR(EINVAL);
+ goto out_unlock;
+ }
+
+ /* Verify all data are being swapped */
+ if (sxp->sx_offset != 0 ||
+ sxp->sx_length != ip->i_d.di_size ||
+ sxp->sx_length != tip->i_d.di_size) {
+ error = XFS_ERROR(EFAULT);
+ goto out_unlock;
+ }
+
+ trace_xfs_swap_extent_before(ip, 0);
+ trace_xfs_swap_extent_before(tip, 1);
+
+ /* check inode formats now that data is flushed */
+ error = xfs_swap_extents_check_format(ip, tip);
+ if (error) {
+ xfs_notice(mp,
+ "%s: inode 0x%llx format is incompatible for exchanging.",
+ __func__, ip->i_ino);
+ goto out_unlock;
+ }
+
+ /*
+ * Compare the current change & modify times with that
+ * passed in. If they differ, we abort this swap.
+ * This is the mechanism used to ensure the calling
+ * process that the file was not changed out from
+ * under it.
+ */
+ if ((sbp->bs_ctime.tv_sec != VFS_I(ip)->i_ctime.tv_sec) ||
+ (sbp->bs_ctime.tv_nsec != VFS_I(ip)->i_ctime.tv_nsec) ||
+ (sbp->bs_mtime.tv_sec != VFS_I(ip)->i_mtime.tv_sec) ||
+ (sbp->bs_mtime.tv_nsec != VFS_I(ip)->i_mtime.tv_nsec)) {
+ error = XFS_ERROR(EBUSY);
+ goto out_unlock;
+ }
+
+ /* We need to fail if the file is memory mapped. Once we have tossed
+ * all existing pages, the page fault will have no option
+ * but to go to the filesystem for pages. By making the page fault call
+ * vop_read (or write in the case of autogrow) they block on the iolock
+ * until we have switched the extents.
+ */
+ if (VN_MAPPED(VFS_I(ip))) {
+ error = XFS_ERROR(EBUSY);
+ goto out_unlock;
+ }
+
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ xfs_iunlock(tip, XFS_ILOCK_EXCL);
+
+ /*
+ * There is a race condition here since we gave up the
+ * ilock. However, the data fork will not change since
+ * we have the iolock (locked for truncation too) so we
+ * are safe. We don't really care if non-io related
+ * fields change.
+ */
+
+ xfs_tosspages(ip, 0, -1, FI_REMAPF);
+
+ tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
+ if ((error = xfs_trans_reserve(tp, 0,
+ XFS_ICHANGE_LOG_RES(mp), 0,
+ 0, 0))) {
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+ xfs_iunlock(tip, XFS_IOLOCK_EXCL);
+ xfs_trans_cancel(tp, 0);
+ goto out;
+ }
+ xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
+
+ /*
+ * Count the number of extended attribute blocks
+ */
+ if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
+ (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
+ error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
+ if (error)
+ goto out_trans_cancel;
+ }
+ if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
+ (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
+ error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
+ &taforkblks);
+ if (error)
+ goto out_trans_cancel;
+ }
+
+ /*
+ * Swap the data forks of the inodes
+ */
+ ifp = &ip->i_df;
+ tifp = &tip->i_df;
+ *tempifp = *ifp; /* struct copy */
+ *ifp = *tifp; /* struct copy */
+ *tifp = *tempifp; /* struct copy */
+
+ /*
+ * Fix the on-disk inode values
+ */
+ tmp = (__uint64_t)ip->i_d.di_nblocks;
+ ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
+ tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
+
+ tmp = (__uint64_t) ip->i_d.di_nextents;
+ ip->i_d.di_nextents = tip->i_d.di_nextents;
+ tip->i_d.di_nextents = tmp;
+
+ tmp = (__uint64_t) ip->i_d.di_format;
+ ip->i_d.di_format = tip->i_d.di_format;
+ tip->i_d.di_format = tmp;
+
+ /*
+ * The extents in the source inode could still contain speculative
+ * preallocation beyond EOF (e.g. the file is open but not modified
+ * while defrag is in progress). In that case, we need to copy over the
+ * number of delalloc blocks the data fork in the source inode is
+ * tracking beyond EOF so that when the fork is truncated away when the
+ * temporary inode is unlinked we don't underrun the i_delayed_blks
+ * counter on that inode.
+ */
+ ASSERT(tip->i_delayed_blks == 0);
+ tip->i_delayed_blks = ip->i_delayed_blks;
+ ip->i_delayed_blks = 0;
+
+ src_log_flags = XFS_ILOG_CORE;
+ switch (ip->i_d.di_format) {
+ case XFS_DINODE_FMT_EXTENTS:
+ /* If the extents fit in the inode, fix the
+ * pointer. Otherwise it's already NULL or
+ * pointing to the extent.
+ */
+ if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
+ ifp->if_u1.if_extents =
+ ifp->if_u2.if_inline_ext;
+ }
+ src_log_flags |= XFS_ILOG_DEXT;
+ break;
+ case XFS_DINODE_FMT_BTREE:
+ src_log_flags |= XFS_ILOG_DBROOT;
+ break;
+ }
+
+ target_log_flags = XFS_ILOG_CORE;
+ switch (tip->i_d.di_format) {
+ case XFS_DINODE_FMT_EXTENTS:
+ /* If the extents fit in the inode, fix the
+ * pointer. Otherwise it's already NULL or
+ * pointing to the extent.
+ */
+ if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
+ tifp->if_u1.if_extents =
+ tifp->if_u2.if_inline_ext;
+ }
+ target_log_flags |= XFS_ILOG_DEXT;
+ break;
+ case XFS_DINODE_FMT_BTREE:
+ target_log_flags |= XFS_ILOG_DBROOT;
+ break;
+ }
+
+
+ xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+ xfs_trans_ijoin(tp, tip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+
+ xfs_trans_log_inode(tp, ip, src_log_flags);
+ xfs_trans_log_inode(tp, tip, target_log_flags);
+
+ /*
+ * If this is a synchronous mount, make sure that the
+ * transaction goes to disk before returning to the user.
+ */
+ if (mp->m_flags & XFS_MOUNT_WSYNC)
+ xfs_trans_set_sync(tp);
+
+ error = xfs_trans_commit(tp, 0);
+
+ trace_xfs_swap_extent_after(ip, 0);
+ trace_xfs_swap_extent_after(tip, 1);
+out:
+ kmem_free(tempifp);
+ return error;
+
+out_unlock:
+ xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+ xfs_iunlock(tip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
+ goto out;
+
+out_trans_cancel:
+ xfs_trans_cancel(tp, 0);
+ goto out_unlock;
+}
generated by cgit (git 2.34.1) at 2024-12-21 04:45:42 +0000