ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/fs/xfs/libxfs/xfs_inode_buf.c b/marvell/linux/fs/xfs/libxfs/xfs_inode_buf.c
new file mode 100644
index 0000000..962e95d
--- /dev/null
+++ b/marvell/linux/fs/xfs/libxfs/xfs_inode_buf.c
@@ -0,0 +1,810 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_inode.h"
+#include "xfs_errortag.h"
+#include "xfs_error.h"
+#include "xfs_icache.h"
+#include "xfs_trans.h"
+#include "xfs_ialloc.h"
+#include "xfs_dir2.h"
+
+#include <linux/iversion.h>
+
+/*
+ * Check that none of the inode's in the buffer have a next
+ * unlinked field of 0.
+ */
+#if defined(DEBUG)
+void
+xfs_inobp_check(
+ xfs_mount_t *mp,
+ xfs_buf_t *bp)
+{
+ int i;
+ xfs_dinode_t *dip;
+
+ for (i = 0; i < M_IGEO(mp)->inodes_per_cluster; i++) {
+ dip = xfs_buf_offset(bp, i * mp->m_sb.sb_inodesize);
+ if (!dip->di_next_unlinked) {
+ xfs_alert(mp,
+ "Detected bogus zero next_unlinked field in inode %d buffer 0x%llx.",
+ i, (long long)bp->b_bn);
+ }
+ }
+}
+#endif
+
+/*
+ * If we are doing readahead on an inode buffer, we might be in log recovery
+ * reading an inode allocation buffer that hasn't yet been replayed, and hence
+ * has not had the inode cores stamped into it. Hence for readahead, the buffer
+ * may be potentially invalid.
+ *
+ * If the readahead buffer is invalid, we need to mark it with an error and
+ * clear the DONE status of the buffer so that a followup read will re-read it
+ * from disk. We don't report the error otherwise to avoid warnings during log
+ * recovery and we don't get unnecssary panics on debug kernels. We use EIO here
+ * because all we want to do is say readahead failed; there is no-one to report
+ * the error to, so this will distinguish it from a non-ra verifier failure.
+ * Changes to this readahead error behavour also need to be reflected in
+ * xfs_dquot_buf_readahead_verify().
+ */
+static void
+xfs_inode_buf_verify(
+ struct xfs_buf *bp,
+ bool readahead)
+{
+ struct xfs_mount *mp = bp->b_mount;
+ xfs_agnumber_t agno;
+ int i;
+ int ni;
+
+ /*
+ * Validate the magic number and version of every inode in the buffer
+ */
+ agno = xfs_daddr_to_agno(mp, XFS_BUF_ADDR(bp));
+ ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock;
+ for (i = 0; i < ni; i++) {
+ int di_ok;
+ xfs_dinode_t *dip;
+ xfs_agino_t unlinked_ino;
+
+ dip = xfs_buf_offset(bp, (i << mp->m_sb.sb_inodelog));
+ unlinked_ino = be32_to_cpu(dip->di_next_unlinked);
+ di_ok = xfs_verify_magic16(bp, dip->di_magic) &&
+ xfs_dinode_good_version(&mp->m_sb, dip->di_version) &&
+ xfs_verify_agino_or_null(mp, agno, unlinked_ino);
+ if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
+ XFS_ERRTAG_ITOBP_INOTOBP))) {
+ if (readahead) {
+ bp->b_flags &= ~XBF_DONE;
+ xfs_buf_ioerror(bp, -EIO);
+ return;
+ }
+
+#ifdef DEBUG
+ xfs_alert(mp,
+ "bad inode magic/vsn daddr %lld #%d (magic=%x)",
+ (unsigned long long)bp->b_bn, i,
+ be16_to_cpu(dip->di_magic));
+#endif
+ xfs_buf_verifier_error(bp, -EFSCORRUPTED,
+ __func__, dip, sizeof(*dip),
+ NULL);
+ return;
+ }
+ }
+}
+
+
+static void
+xfs_inode_buf_read_verify(
+ struct xfs_buf *bp)
+{
+ xfs_inode_buf_verify(bp, false);
+}
+
+static void
+xfs_inode_buf_readahead_verify(
+ struct xfs_buf *bp)
+{
+ xfs_inode_buf_verify(bp, true);
+}
+
+static void
+xfs_inode_buf_write_verify(
+ struct xfs_buf *bp)
+{
+ xfs_inode_buf_verify(bp, false);
+}
+
+const struct xfs_buf_ops xfs_inode_buf_ops = {
+ .name = "xfs_inode",
+ .magic16 = { cpu_to_be16(XFS_DINODE_MAGIC),
+ cpu_to_be16(XFS_DINODE_MAGIC) },
+ .verify_read = xfs_inode_buf_read_verify,
+ .verify_write = xfs_inode_buf_write_verify,
+};
+
+const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
+ .name = "xfs_inode_ra",
+ .magic16 = { cpu_to_be16(XFS_DINODE_MAGIC),
+ cpu_to_be16(XFS_DINODE_MAGIC) },
+ .verify_read = xfs_inode_buf_readahead_verify,
+ .verify_write = xfs_inode_buf_write_verify,
+};
+
+
+/*
+ * This routine is called to map an inode to the buffer containing the on-disk
+ * version of the inode. It returns a pointer to the buffer containing the
+ * on-disk inode in the bpp parameter, and in the dipp parameter it returns a
+ * pointer to the on-disk inode within that buffer.
+ *
+ * If a non-zero error is returned, then the contents of bpp and dipp are
+ * undefined.
+ */
+int
+xfs_imap_to_bp(
+ struct xfs_mount *mp,
+ struct xfs_trans *tp,
+ struct xfs_imap *imap,
+ struct xfs_dinode **dipp,
+ struct xfs_buf **bpp,
+ uint buf_flags,
+ uint iget_flags)
+{
+ struct xfs_buf *bp;
+ int error;
+
+ buf_flags |= XBF_UNMAPPED;
+ error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
+ (int)imap->im_len, buf_flags, &bp,
+ &xfs_inode_buf_ops);
+ if (error) {
+ if (error == -EAGAIN) {
+ ASSERT(buf_flags & XBF_TRYLOCK);
+ return error;
+ }
+ xfs_warn(mp, "%s: xfs_trans_read_buf() returned error %d.",
+ __func__, error);
+ return error;
+ }
+
+ *bpp = bp;
+ *dipp = xfs_buf_offset(bp, imap->im_boffset);
+ return 0;
+}
+
+void
+xfs_inode_from_disk(
+ struct xfs_inode *ip,
+ struct xfs_dinode *from)
+{
+ struct xfs_icdinode *to = &ip->i_d;
+ struct inode *inode = VFS_I(ip);
+
+ /*
+ * Convert v1 inodes immediately to v2 inode format as this is the
+ * minimum inode version format we support in the rest of the code.
+ * They will also be unconditionally written back to disk as v2 inodes.
+ */
+ if (unlikely(from->di_version == 1)) {
+ set_nlink(inode, be16_to_cpu(from->di_onlink));
+ to->di_projid = 0;
+ } else {
+ set_nlink(inode, be32_to_cpu(from->di_nlink));
+ to->di_projid = (prid_t)be16_to_cpu(from->di_projid_hi) << 16 |
+ be16_to_cpu(from->di_projid_lo);
+ }
+
+ to->di_format = from->di_format;
+ i_uid_write(inode, be32_to_cpu(from->di_uid));
+ i_gid_write(inode, be32_to_cpu(from->di_gid));
+ to->di_flushiter = be16_to_cpu(from->di_flushiter);
+
+ /*
+ * Time is signed, so need to convert to signed 32 bit before
+ * storing in inode timestamp which may be 64 bit. Otherwise
+ * a time before epoch is converted to a time long after epoch
+ * on 64 bit systems.
+ */
+ inode->i_atime.tv_sec = (int)be32_to_cpu(from->di_atime.t_sec);
+ inode->i_atime.tv_nsec = (int)be32_to_cpu(from->di_atime.t_nsec);
+ inode->i_mtime.tv_sec = (int)be32_to_cpu(from->di_mtime.t_sec);
+ inode->i_mtime.tv_nsec = (int)be32_to_cpu(from->di_mtime.t_nsec);
+ inode->i_ctime.tv_sec = (int)be32_to_cpu(from->di_ctime.t_sec);
+ inode->i_ctime.tv_nsec = (int)be32_to_cpu(from->di_ctime.t_nsec);
+ inode->i_generation = be32_to_cpu(from->di_gen);
+ inode->i_mode = be16_to_cpu(from->di_mode);
+
+ to->di_size = be64_to_cpu(from->di_size);
+ to->di_nblocks = be64_to_cpu(from->di_nblocks);
+ to->di_extsize = be32_to_cpu(from->di_extsize);
+ to->di_nextents = be32_to_cpu(from->di_nextents);
+ to->di_anextents = be16_to_cpu(from->di_anextents);
+ to->di_forkoff = from->di_forkoff;
+ to->di_aformat = from->di_aformat;
+ to->di_dmevmask = be32_to_cpu(from->di_dmevmask);
+ to->di_dmstate = be16_to_cpu(from->di_dmstate);
+ to->di_flags = be16_to_cpu(from->di_flags);
+
+ if (xfs_sb_version_has_v3inode(&ip->i_mount->m_sb)) {
+ inode_set_iversion_queried(inode,
+ be64_to_cpu(from->di_changecount));
+ to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec);
+ to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec);
+ to->di_flags2 = be64_to_cpu(from->di_flags2);
+ to->di_cowextsize = be32_to_cpu(from->di_cowextsize);
+ }
+}
+
+void
+xfs_inode_to_disk(
+ struct xfs_inode *ip,
+ struct xfs_dinode *to,
+ xfs_lsn_t lsn)
+{
+ struct xfs_icdinode *from = &ip->i_d;
+ struct inode *inode = VFS_I(ip);
+
+ to->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
+ to->di_onlink = 0;
+
+ to->di_format = from->di_format;
+ to->di_uid = cpu_to_be32(i_uid_read(inode));
+ to->di_gid = cpu_to_be32(i_gid_read(inode));
+ to->di_projid_lo = cpu_to_be16(from->di_projid & 0xffff);
+ to->di_projid_hi = cpu_to_be16(from->di_projid >> 16);
+
+ memset(to->di_pad, 0, sizeof(to->di_pad));
+ to->di_atime.t_sec = cpu_to_be32(inode->i_atime.tv_sec);
+ to->di_atime.t_nsec = cpu_to_be32(inode->i_atime.tv_nsec);
+ to->di_mtime.t_sec = cpu_to_be32(inode->i_mtime.tv_sec);
+ to->di_mtime.t_nsec = cpu_to_be32(inode->i_mtime.tv_nsec);
+ to->di_ctime.t_sec = cpu_to_be32(inode->i_ctime.tv_sec);
+ to->di_ctime.t_nsec = cpu_to_be32(inode->i_ctime.tv_nsec);
+ to->di_nlink = cpu_to_be32(inode->i_nlink);
+ to->di_gen = cpu_to_be32(inode->i_generation);
+ to->di_mode = cpu_to_be16(inode->i_mode);
+
+ to->di_size = cpu_to_be64(from->di_size);
+ to->di_nblocks = cpu_to_be64(from->di_nblocks);
+ to->di_extsize = cpu_to_be32(from->di_extsize);
+ to->di_nextents = cpu_to_be32(from->di_nextents);
+ to->di_anextents = cpu_to_be16(from->di_anextents);
+ to->di_forkoff = from->di_forkoff;
+ to->di_aformat = from->di_aformat;
+ to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
+ to->di_dmstate = cpu_to_be16(from->di_dmstate);
+ to->di_flags = cpu_to_be16(from->di_flags);
+
+ if (xfs_sb_version_has_v3inode(&ip->i_mount->m_sb)) {
+ to->di_version = 3;
+ to->di_changecount = cpu_to_be64(inode_peek_iversion(inode));
+ to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
+ to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
+ to->di_flags2 = cpu_to_be64(from->di_flags2);
+ to->di_cowextsize = cpu_to_be32(from->di_cowextsize);
+ to->di_ino = cpu_to_be64(ip->i_ino);
+ to->di_lsn = cpu_to_be64(lsn);
+ memset(to->di_pad2, 0, sizeof(to->di_pad2));
+ uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid);
+ to->di_flushiter = 0;
+ } else {
+ to->di_version = 2;
+ to->di_flushiter = cpu_to_be16(from->di_flushiter);
+ }
+}
+
+void
+xfs_log_dinode_to_disk(
+ struct xfs_log_dinode *from,
+ struct xfs_dinode *to)
+{
+ to->di_magic = cpu_to_be16(from->di_magic);
+ to->di_mode = cpu_to_be16(from->di_mode);
+ to->di_version = from->di_version;
+ to->di_format = from->di_format;
+ to->di_onlink = 0;
+ to->di_uid = cpu_to_be32(from->di_uid);
+ to->di_gid = cpu_to_be32(from->di_gid);
+ to->di_nlink = cpu_to_be32(from->di_nlink);
+ to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
+ to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
+ memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
+
+ to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
+ to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
+ to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
+ to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
+ to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
+ to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
+
+ to->di_size = cpu_to_be64(from->di_size);
+ to->di_nblocks = cpu_to_be64(from->di_nblocks);
+ to->di_extsize = cpu_to_be32(from->di_extsize);
+ to->di_nextents = cpu_to_be32(from->di_nextents);
+ to->di_anextents = cpu_to_be16(from->di_anextents);
+ to->di_forkoff = from->di_forkoff;
+ to->di_aformat = from->di_aformat;
+ to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
+ to->di_dmstate = cpu_to_be16(from->di_dmstate);
+ to->di_flags = cpu_to_be16(from->di_flags);
+ to->di_gen = cpu_to_be32(from->di_gen);
+
+ if (from->di_version == 3) {
+ to->di_changecount = cpu_to_be64(from->di_changecount);
+ to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
+ to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
+ to->di_flags2 = cpu_to_be64(from->di_flags2);
+ to->di_cowextsize = cpu_to_be32(from->di_cowextsize);
+ to->di_ino = cpu_to_be64(from->di_ino);
+ to->di_lsn = cpu_to_be64(from->di_lsn);
+ memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
+ uuid_copy(&to->di_uuid, &from->di_uuid);
+ to->di_flushiter = 0;
+ } else {
+ to->di_flushiter = cpu_to_be16(from->di_flushiter);
+ }
+}
+
+static xfs_failaddr_t
+xfs_dinode_verify_fork(
+ struct xfs_dinode *dip,
+ struct xfs_mount *mp,
+ int whichfork)
+{
+ uint32_t di_nextents = XFS_DFORK_NEXTENTS(dip, whichfork);
+
+ switch (XFS_DFORK_FORMAT(dip, whichfork)) {
+ case XFS_DINODE_FMT_LOCAL:
+ /*
+ * no local regular files yet
+ */
+ if (whichfork == XFS_DATA_FORK) {
+ if (S_ISREG(be16_to_cpu(dip->di_mode)))
+ return __this_address;
+ if (be64_to_cpu(dip->di_size) >
+ XFS_DFORK_SIZE(dip, mp, whichfork))
+ return __this_address;
+ }
+ if (di_nextents)
+ return __this_address;
+ break;
+ case XFS_DINODE_FMT_EXTENTS:
+ if (di_nextents > XFS_DFORK_MAXEXT(dip, mp, whichfork))
+ return __this_address;
+ break;
+ case XFS_DINODE_FMT_BTREE:
+ if (whichfork == XFS_ATTR_FORK) {
+ if (di_nextents > MAXAEXTNUM)
+ return __this_address;
+ } else if (di_nextents > MAXEXTNUM) {
+ return __this_address;
+ }
+ break;
+ default:
+ return __this_address;
+ }
+ return NULL;
+}
+
+static xfs_failaddr_t
+xfs_dinode_verify_forkoff(
+ struct xfs_dinode *dip,
+ struct xfs_mount *mp)
+{
+ if (!XFS_DFORK_Q(dip))
+ return NULL;
+
+ switch (dip->di_format) {
+ case XFS_DINODE_FMT_DEV:
+ if (dip->di_forkoff != (roundup(sizeof(xfs_dev_t), 8) >> 3))
+ return __this_address;
+ break;
+ case XFS_DINODE_FMT_LOCAL: /* fall through ... */
+ case XFS_DINODE_FMT_EXTENTS: /* fall through ... */
+ case XFS_DINODE_FMT_BTREE:
+ if (dip->di_forkoff >= (XFS_LITINO(mp) >> 3))
+ return __this_address;
+ break;
+ default:
+ return __this_address;
+ }
+ return NULL;
+}
+
+xfs_failaddr_t
+xfs_dinode_verify(
+ struct xfs_mount *mp,
+ xfs_ino_t ino,
+ struct xfs_dinode *dip)
+{
+ xfs_failaddr_t fa;
+ uint16_t mode;
+ uint16_t flags;
+ uint64_t flags2;
+ uint64_t di_size;
+
+ if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
+ return __this_address;
+
+ /* Verify v3 integrity information first */
+ if (dip->di_version >= 3) {
+ if (!xfs_sb_version_has_v3inode(&mp->m_sb))
+ return __this_address;
+ if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
+ XFS_DINODE_CRC_OFF))
+ return __this_address;
+ if (be64_to_cpu(dip->di_ino) != ino)
+ return __this_address;
+ if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid))
+ return __this_address;
+ }
+
+ /* don't allow invalid i_size */
+ di_size = be64_to_cpu(dip->di_size);
+ if (di_size & (1ULL << 63))
+ return __this_address;
+
+ mode = be16_to_cpu(dip->di_mode);
+ if (mode && xfs_mode_to_ftype(mode) == XFS_DIR3_FT_UNKNOWN)
+ return __this_address;
+
+ /* No zero-length symlinks/dirs. */
+ if ((S_ISLNK(mode) || S_ISDIR(mode)) && di_size == 0)
+ return __this_address;
+
+ /* Fork checks carried over from xfs_iformat_fork */
+ if (mode &&
+ be32_to_cpu(dip->di_nextents) + be16_to_cpu(dip->di_anextents) >
+ be64_to_cpu(dip->di_nblocks))
+ return __this_address;
+
+ if (mode && XFS_DFORK_BOFF(dip) > mp->m_sb.sb_inodesize)
+ return __this_address;
+
+ flags = be16_to_cpu(dip->di_flags);
+
+ if (mode && (flags & XFS_DIFLAG_REALTIME) && !mp->m_rtdev_targp)
+ return __this_address;
+
+ /* check for illegal values of forkoff */
+ fa = xfs_dinode_verify_forkoff(dip, mp);
+ if (fa)
+ return fa;
+
+ /* Do we have appropriate data fork formats for the mode? */
+ switch (mode & S_IFMT) {
+ case S_IFIFO:
+ case S_IFCHR:
+ case S_IFBLK:
+ case S_IFSOCK:
+ if (dip->di_format != XFS_DINODE_FMT_DEV)
+ return __this_address;
+ break;
+ case S_IFREG:
+ case S_IFLNK:
+ case S_IFDIR:
+ fa = xfs_dinode_verify_fork(dip, mp, XFS_DATA_FORK);
+ if (fa)
+ return fa;
+ break;
+ case 0:
+ /* Uninitialized inode ok. */
+ break;
+ default:
+ return __this_address;
+ }
+
+ if (XFS_DFORK_Q(dip)) {
+ fa = xfs_dinode_verify_fork(dip, mp, XFS_ATTR_FORK);
+ if (fa)
+ return fa;
+ } else {
+ /*
+ * If there is no fork offset, this may be a freshly-made inode
+ * in a new disk cluster, in which case di_aformat is zeroed.
+ * Otherwise, such an inode must be in EXTENTS format; this goes
+ * for freed inodes as well.
+ */
+ switch (dip->di_aformat) {
+ case 0:
+ case XFS_DINODE_FMT_EXTENTS:
+ break;
+ default:
+ return __this_address;
+ }
+ if (dip->di_anextents)
+ return __this_address;
+ }
+
+ /* extent size hint validation */
+ fa = xfs_inode_validate_extsize(mp, be32_to_cpu(dip->di_extsize),
+ mode, flags);
+ if (fa)
+ return fa;
+
+ /* only version 3 or greater inodes are extensively verified here */
+ if (dip->di_version < 3)
+ return NULL;
+
+ flags2 = be64_to_cpu(dip->di_flags2);
+
+ /* don't allow reflink/cowextsize if we don't have reflink */
+ if ((flags2 & (XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)) &&
+ !xfs_sb_version_hasreflink(&mp->m_sb))
+ return __this_address;
+
+ /* only regular files get reflink */
+ if ((flags2 & XFS_DIFLAG2_REFLINK) && (mode & S_IFMT) != S_IFREG)
+ return __this_address;
+
+ /* don't let reflink and realtime mix */
+ if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags & XFS_DIFLAG_REALTIME))
+ return __this_address;
+
+ /* don't let reflink and dax mix */
+ if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags2 & XFS_DIFLAG2_DAX))
+ return __this_address;
+
+ /* COW extent size hint validation */
+ fa = xfs_inode_validate_cowextsize(mp, be32_to_cpu(dip->di_cowextsize),
+ mode, flags, flags2);
+ if (fa)
+ return fa;
+
+ return NULL;
+}
+
+void
+xfs_dinode_calc_crc(
+ struct xfs_mount *mp,
+ struct xfs_dinode *dip)
+{
+ uint32_t crc;
+
+ if (dip->di_version < 3)
+ return;
+
+ ASSERT(xfs_sb_version_hascrc(&mp->m_sb));
+ crc = xfs_start_cksum_update((char *)dip, mp->m_sb.sb_inodesize,
+ XFS_DINODE_CRC_OFF);
+ dip->di_crc = xfs_end_cksum(crc);
+}
+
+/*
+ * Read the disk inode attributes into the in-core inode structure.
+ *
+ * For version 5 superblocks, if we are initialising a new inode and we are not
+ * utilising the XFS_MOUNT_IKEEP inode cluster mode, we can simple build the new
+ * inode core with a random generation number. If we are keeping inodes around,
+ * we need to read the inode cluster to get the existing generation number off
+ * disk. Further, if we are using version 4 superblocks (i.e. v1/v2 inode
+ * format) then log recovery is dependent on the di_flushiter field being
+ * initialised from the current on-disk value and hence we must also read the
+ * inode off disk.
+ */
+int
+xfs_iread(
+ xfs_mount_t *mp,
+ xfs_trans_t *tp,
+ xfs_inode_t *ip,
+ uint iget_flags)
+{
+ xfs_buf_t *bp;
+ xfs_dinode_t *dip;
+ xfs_failaddr_t fa;
+ int error;
+
+ /*
+ * Fill in the location information in the in-core inode.
+ */
+ error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
+ if (error)
+ return error;
+
+ /* shortcut IO on inode allocation if possible */
+ if ((iget_flags & XFS_IGET_CREATE) &&
+ xfs_sb_version_has_v3inode(&mp->m_sb) &&
+ !(mp->m_flags & XFS_MOUNT_IKEEP)) {
+ /* initialise the on-disk inode core */
+ memset(&ip->i_d, 0, sizeof(ip->i_d));
+ VFS_I(ip)->i_generation = prandom_u32();
+ return 0;
+ }
+
+ /*
+ * Get pointers to the on-disk inode and the buffer containing it.
+ */
+ error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &bp, 0, iget_flags);
+ if (error)
+ return error;
+
+ /* even unallocated inodes are verified */
+ fa = xfs_dinode_verify(mp, ip->i_ino, dip);
+ if (fa) {
+ xfs_inode_verifier_error(ip, -EFSCORRUPTED, "dinode", dip,
+ sizeof(*dip), fa);
+ error = -EFSCORRUPTED;
+ goto out_brelse;
+ }
+
+ /*
+ * If the on-disk inode is already linked to a directory
+ * entry, copy all of the inode into the in-core inode.
+ * xfs_iformat_fork() handles copying in the inode format
+ * specific information.
+ * Otherwise, just get the truly permanent information.
+ */
+ if (dip->di_mode) {
+ xfs_inode_from_disk(ip, dip);
+ error = xfs_iformat_fork(ip, dip);
+ if (error) {
+#ifdef DEBUG
+ xfs_alert(mp, "%s: xfs_iformat() returned error %d",
+ __func__, error);
+#endif /* DEBUG */
+ goto out_brelse;
+ }
+ } else {
+ /*
+ * Partial initialisation of the in-core inode. Just the bits
+ * that xfs_ialloc won't overwrite or relies on being correct.
+ */
+ VFS_I(ip)->i_generation = be32_to_cpu(dip->di_gen);
+ ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter);
+
+ /*
+ * Make sure to pull in the mode here as well in
+ * case the inode is released without being used.
+ * This ensures that xfs_inactive() will see that
+ * the inode is already free and not try to mess
+ * with the uninitialized part of it.
+ */
+ VFS_I(ip)->i_mode = 0;
+ }
+
+ ip->i_delayed_blks = 0;
+
+ /*
+ * Mark the buffer containing the inode as something to keep
+ * around for a while. This helps to keep recently accessed
+ * meta-data in-core longer.
+ */
+ xfs_buf_set_ref(bp, XFS_INO_REF);
+
+ /*
+ * Use xfs_trans_brelse() to release the buffer containing the on-disk
+ * inode, because it was acquired with xfs_trans_read_buf() in
+ * xfs_imap_to_bp() above. If tp is NULL, this is just a normal
+ * brelse(). If we're within a transaction, then xfs_trans_brelse()
+ * will only release the buffer if it is not dirty within the
+ * transaction. It will be OK to release the buffer in this case,
+ * because inodes on disk are never destroyed and we will be locking the
+ * new in-core inode before putting it in the cache where other
+ * processes can find it. Thus we don't have to worry about the inode
+ * being changed just because we released the buffer.
+ */
+ out_brelse:
+ xfs_trans_brelse(tp, bp);
+ return error;
+}
+
+/*
+ * Validate di_extsize hint.
+ *
+ * The rules are documented at xfs_ioctl_setattr_check_extsize().
+ * These functions must be kept in sync with each other.
+ */
+xfs_failaddr_t
+xfs_inode_validate_extsize(
+ struct xfs_mount *mp,
+ uint32_t extsize,
+ uint16_t mode,
+ uint16_t flags)
+{
+ bool rt_flag;
+ bool hint_flag;
+ bool inherit_flag;
+ uint32_t extsize_bytes;
+ uint32_t blocksize_bytes;
+
+ rt_flag = (flags & XFS_DIFLAG_REALTIME);
+ hint_flag = (flags & XFS_DIFLAG_EXTSIZE);
+ inherit_flag = (flags & XFS_DIFLAG_EXTSZINHERIT);
+ extsize_bytes = XFS_FSB_TO_B(mp, extsize);
+
+ if (rt_flag)
+ blocksize_bytes = mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog;
+ else
+ blocksize_bytes = mp->m_sb.sb_blocksize;
+
+ if ((hint_flag || inherit_flag) && !(S_ISDIR(mode) || S_ISREG(mode)))
+ return __this_address;
+
+ if (hint_flag && !S_ISREG(mode))
+ return __this_address;
+
+ if (inherit_flag && !S_ISDIR(mode))
+ return __this_address;
+
+ if ((hint_flag || inherit_flag) && extsize == 0)
+ return __this_address;
+
+ /* free inodes get flags set to zero but extsize remains */
+ if (mode && !(hint_flag || inherit_flag) && extsize != 0)
+ return __this_address;
+
+ if (extsize_bytes % blocksize_bytes)
+ return __this_address;
+
+ if (extsize > MAXEXTLEN)
+ return __this_address;
+
+ if (!rt_flag && extsize > mp->m_sb.sb_agblocks / 2)
+ return __this_address;
+
+ return NULL;
+}
+
+/*
+ * Validate di_cowextsize hint.
+ *
+ * The rules are documented at xfs_ioctl_setattr_check_cowextsize().
+ * These functions must be kept in sync with each other.
+ */
+xfs_failaddr_t
+xfs_inode_validate_cowextsize(
+ struct xfs_mount *mp,
+ uint32_t cowextsize,
+ uint16_t mode,
+ uint16_t flags,
+ uint64_t flags2)
+{
+ bool rt_flag;
+ bool hint_flag;
+ uint32_t cowextsize_bytes;
+
+ rt_flag = (flags & XFS_DIFLAG_REALTIME);
+ hint_flag = (flags2 & XFS_DIFLAG2_COWEXTSIZE);
+ cowextsize_bytes = XFS_FSB_TO_B(mp, cowextsize);
+
+ if (hint_flag && !xfs_sb_version_hasreflink(&mp->m_sb))
+ return __this_address;
+
+ if (hint_flag && !(S_ISDIR(mode) || S_ISREG(mode)))
+ return __this_address;
+
+ if (hint_flag && cowextsize == 0)
+ return __this_address;
+
+ /* free inodes get flags set to zero but cowextsize remains */
+ if (mode && !hint_flag && cowextsize != 0)
+ return __this_address;
+
+ if (hint_flag && rt_flag)
+ return __this_address;
+
+ if (cowextsize_bytes % mp->m_sb.sb_blocksize)
+ return __this_address;
+
+ if (cowextsize > MAXEXTLEN)
+ return __this_address;
+
+ if (cowextsize > mp->m_sb.sb_agblocks / 2)
+ return __this_address;
+
+ return NULL;
+}