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773 lines
21 KiB
773 lines
21 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2000-2006 Silicon Graphics, Inc. |
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* All Rights Reserved. |
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*/ |
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#include "xfs.h" |
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#include "xfs_fs.h" |
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#include "xfs_shared.h" |
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#include "xfs_format.h" |
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#include "xfs_log_format.h" |
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#include "xfs_trans_resv.h" |
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#include "xfs_mount.h" |
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#include "xfs_ag.h" |
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#include "xfs_inode.h" |
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#include "xfs_errortag.h" |
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#include "xfs_error.h" |
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#include "xfs_icache.h" |
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#include "xfs_trans.h" |
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#include "xfs_ialloc.h" |
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#include "xfs_dir2.h" |
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|
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#include <linux/iversion.h> |
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|
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/* |
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* If we are doing readahead on an inode buffer, we might be in log recovery |
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* reading an inode allocation buffer that hasn't yet been replayed, and hence |
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* has not had the inode cores stamped into it. Hence for readahead, the buffer |
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* may be potentially invalid. |
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* |
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* If the readahead buffer is invalid, we need to mark it with an error and |
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* clear the DONE status of the buffer so that a followup read will re-read it |
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* from disk. We don't report the error otherwise to avoid warnings during log |
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* recovery and we don't get unnecessary panics on debug kernels. We use EIO here |
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* because all we want to do is say readahead failed; there is no-one to report |
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* the error to, so this will distinguish it from a non-ra verifier failure. |
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* Changes to this readahead error behaviour also need to be reflected in |
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* xfs_dquot_buf_readahead_verify(). |
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*/ |
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static void |
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xfs_inode_buf_verify( |
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struct xfs_buf *bp, |
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bool readahead) |
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{ |
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struct xfs_mount *mp = bp->b_mount; |
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int i; |
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int ni; |
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|
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/* |
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* Validate the magic number and version of every inode in the buffer |
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*/ |
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ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock; |
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for (i = 0; i < ni; i++) { |
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struct xfs_dinode *dip; |
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xfs_agino_t unlinked_ino; |
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int di_ok; |
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dip = xfs_buf_offset(bp, (i << mp->m_sb.sb_inodelog)); |
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unlinked_ino = be32_to_cpu(dip->di_next_unlinked); |
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di_ok = xfs_verify_magic16(bp, dip->di_magic) && |
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xfs_dinode_good_version(mp, dip->di_version) && |
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xfs_verify_agino_or_null(bp->b_pag, unlinked_ino); |
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if (unlikely(XFS_TEST_ERROR(!di_ok, mp, |
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XFS_ERRTAG_ITOBP_INOTOBP))) { |
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if (readahead) { |
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bp->b_flags &= ~XBF_DONE; |
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xfs_buf_ioerror(bp, -EIO); |
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return; |
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} |
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|
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#ifdef DEBUG |
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xfs_alert(mp, |
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"bad inode magic/vsn daddr %lld #%d (magic=%x)", |
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(unsigned long long)xfs_buf_daddr(bp), i, |
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be16_to_cpu(dip->di_magic)); |
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#endif |
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xfs_buf_verifier_error(bp, -EFSCORRUPTED, |
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__func__, dip, sizeof(*dip), |
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NULL); |
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return; |
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} |
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} |
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} |
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static void |
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xfs_inode_buf_read_verify( |
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struct xfs_buf *bp) |
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{ |
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xfs_inode_buf_verify(bp, false); |
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} |
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|
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static void |
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xfs_inode_buf_readahead_verify( |
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struct xfs_buf *bp) |
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{ |
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xfs_inode_buf_verify(bp, true); |
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} |
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|
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static void |
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xfs_inode_buf_write_verify( |
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struct xfs_buf *bp) |
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{ |
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xfs_inode_buf_verify(bp, false); |
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} |
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|
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const struct xfs_buf_ops xfs_inode_buf_ops = { |
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.name = "xfs_inode", |
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.magic16 = { cpu_to_be16(XFS_DINODE_MAGIC), |
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cpu_to_be16(XFS_DINODE_MAGIC) }, |
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.verify_read = xfs_inode_buf_read_verify, |
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.verify_write = xfs_inode_buf_write_verify, |
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}; |
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const struct xfs_buf_ops xfs_inode_buf_ra_ops = { |
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.name = "xfs_inode_ra", |
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.magic16 = { cpu_to_be16(XFS_DINODE_MAGIC), |
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cpu_to_be16(XFS_DINODE_MAGIC) }, |
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.verify_read = xfs_inode_buf_readahead_verify, |
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.verify_write = xfs_inode_buf_write_verify, |
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}; |
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/* |
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* This routine is called to map an inode to the buffer containing the on-disk |
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* version of the inode. It returns a pointer to the buffer containing the |
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* on-disk inode in the bpp parameter. |
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*/ |
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int |
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xfs_imap_to_bp( |
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struct xfs_mount *mp, |
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struct xfs_trans *tp, |
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struct xfs_imap *imap, |
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struct xfs_buf **bpp) |
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{ |
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return xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno, |
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imap->im_len, XBF_UNMAPPED, bpp, |
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&xfs_inode_buf_ops); |
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} |
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|
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static inline struct timespec64 xfs_inode_decode_bigtime(uint64_t ts) |
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{ |
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struct timespec64 tv; |
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uint32_t n; |
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|
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tv.tv_sec = xfs_bigtime_to_unix(div_u64_rem(ts, NSEC_PER_SEC, &n)); |
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tv.tv_nsec = n; |
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return tv; |
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} |
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|
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/* Convert an ondisk timestamp to an incore timestamp. */ |
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struct timespec64 |
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xfs_inode_from_disk_ts( |
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struct xfs_dinode *dip, |
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const xfs_timestamp_t ts) |
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{ |
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struct timespec64 tv; |
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struct xfs_legacy_timestamp *lts; |
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|
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if (xfs_dinode_has_bigtime(dip)) |
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return xfs_inode_decode_bigtime(be64_to_cpu(ts)); |
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lts = (struct xfs_legacy_timestamp *)&ts; |
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tv.tv_sec = (int)be32_to_cpu(lts->t_sec); |
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tv.tv_nsec = (int)be32_to_cpu(lts->t_nsec); |
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return tv; |
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} |
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|
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int |
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xfs_inode_from_disk( |
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struct xfs_inode *ip, |
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struct xfs_dinode *from) |
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{ |
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struct inode *inode = VFS_I(ip); |
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int error; |
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xfs_failaddr_t fa; |
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|
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ASSERT(ip->i_cowfp == NULL); |
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fa = xfs_dinode_verify(ip->i_mount, ip->i_ino, from); |
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if (fa) { |
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xfs_inode_verifier_error(ip, -EFSCORRUPTED, "dinode", from, |
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sizeof(*from), fa); |
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return -EFSCORRUPTED; |
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} |
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/* |
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* First get the permanent information that is needed to allocate an |
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* inode. If the inode is unused, mode is zero and we shouldn't mess |
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* with the uninitialized part of it. |
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*/ |
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if (!xfs_has_v3inodes(ip->i_mount)) |
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ip->i_flushiter = be16_to_cpu(from->di_flushiter); |
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inode->i_generation = be32_to_cpu(from->di_gen); |
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inode->i_mode = be16_to_cpu(from->di_mode); |
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if (!inode->i_mode) |
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return 0; |
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|
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/* |
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* Convert v1 inodes immediately to v2 inode format as this is the |
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* minimum inode version format we support in the rest of the code. |
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* They will also be unconditionally written back to disk as v2 inodes. |
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*/ |
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if (unlikely(from->di_version == 1)) { |
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set_nlink(inode, be16_to_cpu(from->di_onlink)); |
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ip->i_projid = 0; |
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} else { |
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set_nlink(inode, be32_to_cpu(from->di_nlink)); |
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ip->i_projid = (prid_t)be16_to_cpu(from->di_projid_hi) << 16 | |
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be16_to_cpu(from->di_projid_lo); |
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} |
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i_uid_write(inode, be32_to_cpu(from->di_uid)); |
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i_gid_write(inode, be32_to_cpu(from->di_gid)); |
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|
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/* |
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* Time is signed, so need to convert to signed 32 bit before |
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* storing in inode timestamp which may be 64 bit. Otherwise |
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* a time before epoch is converted to a time long after epoch |
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* on 64 bit systems. |
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*/ |
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inode->i_atime = xfs_inode_from_disk_ts(from, from->di_atime); |
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inode->i_mtime = xfs_inode_from_disk_ts(from, from->di_mtime); |
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inode->i_ctime = xfs_inode_from_disk_ts(from, from->di_ctime); |
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|
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ip->i_disk_size = be64_to_cpu(from->di_size); |
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ip->i_nblocks = be64_to_cpu(from->di_nblocks); |
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ip->i_extsize = be32_to_cpu(from->di_extsize); |
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ip->i_forkoff = from->di_forkoff; |
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ip->i_diflags = be16_to_cpu(from->di_flags); |
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ip->i_next_unlinked = be32_to_cpu(from->di_next_unlinked); |
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if (from->di_dmevmask || from->di_dmstate) |
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xfs_iflags_set(ip, XFS_IPRESERVE_DM_FIELDS); |
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if (xfs_has_v3inodes(ip->i_mount)) { |
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inode_set_iversion_queried(inode, |
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be64_to_cpu(from->di_changecount)); |
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ip->i_crtime = xfs_inode_from_disk_ts(from, from->di_crtime); |
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ip->i_diflags2 = be64_to_cpu(from->di_flags2); |
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ip->i_cowextsize = be32_to_cpu(from->di_cowextsize); |
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} |
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error = xfs_iformat_data_fork(ip, from); |
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if (error) |
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return error; |
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if (from->di_forkoff) { |
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error = xfs_iformat_attr_fork(ip, from); |
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if (error) |
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goto out_destroy_data_fork; |
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} |
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if (xfs_is_reflink_inode(ip)) |
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xfs_ifork_init_cow(ip); |
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return 0; |
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out_destroy_data_fork: |
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xfs_idestroy_fork(&ip->i_df); |
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return error; |
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} |
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/* Convert an incore timestamp to an ondisk timestamp. */ |
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static inline xfs_timestamp_t |
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xfs_inode_to_disk_ts( |
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struct xfs_inode *ip, |
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const struct timespec64 tv) |
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{ |
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struct xfs_legacy_timestamp *lts; |
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xfs_timestamp_t ts; |
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if (xfs_inode_has_bigtime(ip)) |
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return cpu_to_be64(xfs_inode_encode_bigtime(tv)); |
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lts = (struct xfs_legacy_timestamp *)&ts; |
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lts->t_sec = cpu_to_be32(tv.tv_sec); |
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lts->t_nsec = cpu_to_be32(tv.tv_nsec); |
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return ts; |
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} |
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|
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static inline void |
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xfs_inode_to_disk_iext_counters( |
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struct xfs_inode *ip, |
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struct xfs_dinode *to) |
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{ |
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if (xfs_inode_has_large_extent_counts(ip)) { |
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to->di_big_nextents = cpu_to_be64(xfs_ifork_nextents(&ip->i_df)); |
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to->di_big_anextents = cpu_to_be32(xfs_ifork_nextents(&ip->i_af)); |
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/* |
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* We might be upgrading the inode to use larger extent counters |
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* than was previously used. Hence zero the unused field. |
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*/ |
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to->di_nrext64_pad = cpu_to_be16(0); |
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} else { |
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to->di_nextents = cpu_to_be32(xfs_ifork_nextents(&ip->i_df)); |
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to->di_anextents = cpu_to_be16(xfs_ifork_nextents(&ip->i_af)); |
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} |
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} |
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|
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void |
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xfs_inode_to_disk( |
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struct xfs_inode *ip, |
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struct xfs_dinode *to, |
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xfs_lsn_t lsn) |
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{ |
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struct inode *inode = VFS_I(ip); |
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to->di_magic = cpu_to_be16(XFS_DINODE_MAGIC); |
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to->di_onlink = 0; |
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to->di_format = xfs_ifork_format(&ip->i_df); |
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to->di_uid = cpu_to_be32(i_uid_read(inode)); |
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to->di_gid = cpu_to_be32(i_gid_read(inode)); |
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to->di_projid_lo = cpu_to_be16(ip->i_projid & 0xffff); |
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to->di_projid_hi = cpu_to_be16(ip->i_projid >> 16); |
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to->di_atime = xfs_inode_to_disk_ts(ip, inode->i_atime); |
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to->di_mtime = xfs_inode_to_disk_ts(ip, inode->i_mtime); |
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to->di_ctime = xfs_inode_to_disk_ts(ip, inode->i_ctime); |
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to->di_nlink = cpu_to_be32(inode->i_nlink); |
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to->di_gen = cpu_to_be32(inode->i_generation); |
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to->di_mode = cpu_to_be16(inode->i_mode); |
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to->di_size = cpu_to_be64(ip->i_disk_size); |
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to->di_nblocks = cpu_to_be64(ip->i_nblocks); |
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to->di_extsize = cpu_to_be32(ip->i_extsize); |
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to->di_forkoff = ip->i_forkoff; |
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to->di_aformat = xfs_ifork_format(&ip->i_af); |
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to->di_flags = cpu_to_be16(ip->i_diflags); |
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|
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if (xfs_has_v3inodes(ip->i_mount)) { |
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to->di_version = 3; |
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to->di_changecount = cpu_to_be64(inode_peek_iversion(inode)); |
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to->di_crtime = xfs_inode_to_disk_ts(ip, ip->i_crtime); |
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to->di_flags2 = cpu_to_be64(ip->i_diflags2); |
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to->di_cowextsize = cpu_to_be32(ip->i_cowextsize); |
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to->di_ino = cpu_to_be64(ip->i_ino); |
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to->di_lsn = cpu_to_be64(lsn); |
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memset(to->di_pad2, 0, sizeof(to->di_pad2)); |
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uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid); |
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to->di_v3_pad = 0; |
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} else { |
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to->di_version = 2; |
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to->di_flushiter = cpu_to_be16(ip->i_flushiter); |
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memset(to->di_v2_pad, 0, sizeof(to->di_v2_pad)); |
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} |
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|
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xfs_inode_to_disk_iext_counters(ip, to); |
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} |
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|
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static xfs_failaddr_t |
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xfs_dinode_verify_fork( |
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struct xfs_dinode *dip, |
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struct xfs_mount *mp, |
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int whichfork) |
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{ |
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xfs_extnum_t di_nextents; |
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xfs_extnum_t max_extents; |
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mode_t mode = be16_to_cpu(dip->di_mode); |
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uint32_t fork_size = XFS_DFORK_SIZE(dip, mp, whichfork); |
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uint32_t fork_format = XFS_DFORK_FORMAT(dip, whichfork); |
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di_nextents = xfs_dfork_nextents(dip, whichfork); |
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/* |
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* For fork types that can contain local data, check that the fork |
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* format matches the size of local data contained within the fork. |
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* |
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* For all types, check that when the size says the should be in extent |
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* or btree format, the inode isn't claiming it is in local format. |
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*/ |
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if (whichfork == XFS_DATA_FORK) { |
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if (S_ISDIR(mode) || S_ISLNK(mode)) { |
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if (be64_to_cpu(dip->di_size) <= fork_size && |
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fork_format != XFS_DINODE_FMT_LOCAL) |
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return __this_address; |
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} |
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|
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if (be64_to_cpu(dip->di_size) > fork_size && |
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fork_format == XFS_DINODE_FMT_LOCAL) |
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return __this_address; |
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} |
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|
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switch (fork_format) { |
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case XFS_DINODE_FMT_LOCAL: |
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/* |
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* No local regular files yet. |
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*/ |
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if (S_ISREG(mode) && whichfork == XFS_DATA_FORK) |
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return __this_address; |
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if (di_nextents) |
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return __this_address; |
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break; |
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case XFS_DINODE_FMT_EXTENTS: |
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if (di_nextents > XFS_DFORK_MAXEXT(dip, mp, whichfork)) |
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return __this_address; |
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break; |
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case XFS_DINODE_FMT_BTREE: |
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max_extents = xfs_iext_max_nextents( |
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xfs_dinode_has_large_extent_counts(dip), |
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whichfork); |
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if (di_nextents > max_extents) |
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return __this_address; |
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break; |
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default: |
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return __this_address; |
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} |
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return NULL; |
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} |
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|
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static xfs_failaddr_t |
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xfs_dinode_verify_forkoff( |
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struct xfs_dinode *dip, |
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struct xfs_mount *mp) |
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{ |
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if (!dip->di_forkoff) |
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return NULL; |
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|
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switch (dip->di_format) { |
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case XFS_DINODE_FMT_DEV: |
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if (dip->di_forkoff != (roundup(sizeof(xfs_dev_t), 8) >> 3)) |
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return __this_address; |
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break; |
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case XFS_DINODE_FMT_LOCAL: /* fall through ... */ |
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case XFS_DINODE_FMT_EXTENTS: /* fall through ... */ |
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case XFS_DINODE_FMT_BTREE: |
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if (dip->di_forkoff >= (XFS_LITINO(mp) >> 3)) |
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return __this_address; |
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break; |
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default: |
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return __this_address; |
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} |
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return NULL; |
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} |
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|
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static xfs_failaddr_t |
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xfs_dinode_verify_nrext64( |
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struct xfs_mount *mp, |
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struct xfs_dinode *dip) |
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{ |
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if (xfs_dinode_has_large_extent_counts(dip)) { |
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if (!xfs_has_large_extent_counts(mp)) |
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return __this_address; |
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if (dip->di_nrext64_pad != 0) |
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return __this_address; |
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} else if (dip->di_version >= 3) { |
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if (dip->di_v3_pad != 0) |
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return __this_address; |
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} |
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|
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return NULL; |
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} |
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|
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xfs_failaddr_t |
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xfs_dinode_verify( |
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struct xfs_mount *mp, |
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xfs_ino_t ino, |
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struct xfs_dinode *dip) |
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{ |
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xfs_failaddr_t fa; |
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uint16_t mode; |
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uint16_t flags; |
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uint64_t flags2; |
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uint64_t di_size; |
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xfs_extnum_t nextents; |
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xfs_extnum_t naextents; |
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xfs_filblks_t nblocks; |
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|
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if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC)) |
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return __this_address; |
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|
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/* Verify v3 integrity information first */ |
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if (dip->di_version >= 3) { |
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if (!xfs_has_v3inodes(mp)) |
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return __this_address; |
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if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize, |
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XFS_DINODE_CRC_OFF)) |
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return __this_address; |
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if (be64_to_cpu(dip->di_ino) != ino) |
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return __this_address; |
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if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid)) |
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return __this_address; |
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} |
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|
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/* don't allow invalid i_size */ |
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di_size = be64_to_cpu(dip->di_size); |
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if (di_size & (1ULL << 63)) |
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return __this_address; |
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|
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mode = be16_to_cpu(dip->di_mode); |
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if (mode && xfs_mode_to_ftype(mode) == XFS_DIR3_FT_UNKNOWN) |
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return __this_address; |
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|
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/* No zero-length symlinks/dirs. */ |
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if ((S_ISLNK(mode) || S_ISDIR(mode)) && di_size == 0) |
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return __this_address; |
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|
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fa = xfs_dinode_verify_nrext64(mp, dip); |
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if (fa) |
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return fa; |
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|
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nextents = xfs_dfork_data_extents(dip); |
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naextents = xfs_dfork_attr_extents(dip); |
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nblocks = be64_to_cpu(dip->di_nblocks); |
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|
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/* Fork checks carried over from xfs_iformat_fork */ |
|
if (mode && nextents + naextents > nblocks) |
|
return __this_address; |
|
|
|
if (S_ISDIR(mode) && nextents > mp->m_dir_geo->max_extents) |
|
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 (dip->di_forkoff) { |
|
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 (naextents) |
|
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_has_reflink(mp)) |
|
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; |
|
|
|
/* COW extent size hint validation */ |
|
fa = xfs_inode_validate_cowextsize(mp, be32_to_cpu(dip->di_cowextsize), |
|
mode, flags, flags2); |
|
if (fa) |
|
return fa; |
|
|
|
/* bigtime iflag can only happen on bigtime filesystems */ |
|
if (xfs_dinode_has_bigtime(dip) && |
|
!xfs_has_bigtime(mp)) |
|
return __this_address; |
|
|
|
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_has_crc(mp)); |
|
crc = xfs_start_cksum_update((char *)dip, mp->m_sb.sb_inodesize, |
|
XFS_DINODE_CRC_OFF); |
|
dip->di_crc = xfs_end_cksum(crc); |
|
} |
|
|
|
/* |
|
* Validate di_extsize hint. |
|
* |
|
* 1. Extent size hint is only valid for directories and regular files. |
|
* 2. FS_XFLAG_EXTSIZE is only valid for regular files. |
|
* 3. FS_XFLAG_EXTSZINHERIT is only valid for directories. |
|
* 4. Hint cannot be larger than MAXTEXTLEN. |
|
* 5. Can be changed on directories at any time. |
|
* 6. Hint value of 0 turns off hints, clears inode flags. |
|
* 7. Extent size must be a multiple of the appropriate block size. |
|
* For realtime files, this is the rt extent size. |
|
* 8. For non-realtime files, the extent size hint must be limited |
|
* to half the AG size to avoid alignment extending the extent beyond the |
|
* limits of the AG. |
|
*/ |
|
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); |
|
|
|
/* |
|
* This comment describes a historic gap in this verifier function. |
|
* |
|
* For a directory with both RTINHERIT and EXTSZINHERIT flags set, this |
|
* function has never checked that the extent size hint is an integer |
|
* multiple of the realtime extent size. Since we allow users to set |
|
* this combination on non-rt filesystems /and/ to change the rt |
|
* extent size when adding a rt device to a filesystem, the net effect |
|
* is that users can configure a filesystem anticipating one rt |
|
* geometry and change their minds later. Directories do not use the |
|
* extent size hint, so this is harmless for them. |
|
* |
|
* If a directory with a misaligned extent size hint is allowed to |
|
* propagate that hint into a new regular realtime file, the result |
|
* is that the inode cluster buffer verifier will trigger a corruption |
|
* shutdown the next time it is run, because the verifier has always |
|
* enforced the alignment rule for regular files. |
|
* |
|
* Because we allow administrators to set a new rt extent size when |
|
* adding a rt section, we cannot add a check to this verifier because |
|
* that will result a new source of directory corruption errors when |
|
* reading an existing filesystem. Instead, we rely on callers to |
|
* decide when alignment checks are appropriate, and fix things up as |
|
* needed. |
|
*/ |
|
|
|
if (rt_flag) |
|
blocksize_bytes = XFS_FSB_TO_B(mp, mp->m_sb.sb_rextsize); |
|
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 > XFS_MAX_BMBT_EXTLEN) |
|
return __this_address; |
|
|
|
if (!rt_flag && extsize > mp->m_sb.sb_agblocks / 2) |
|
return __this_address; |
|
|
|
return NULL; |
|
} |
|
|
|
/* |
|
* Validate di_cowextsize hint. |
|
* |
|
* 1. CoW extent size hint can only be set if reflink is enabled on the fs. |
|
* The inode does not have to have any shared blocks, but it must be a v3. |
|
* 2. FS_XFLAG_COWEXTSIZE is only valid for directories and regular files; |
|
* for a directory, the hint is propagated to new files. |
|
* 3. Can be changed on files & directories at any time. |
|
* 4. Hint value of 0 turns off hints, clears inode flags. |
|
* 5. Extent size must be a multiple of the appropriate block size. |
|
* 6. The extent size hint must be limited to half the AG size to avoid |
|
* alignment extending the extent beyond the limits of the AG. |
|
*/ |
|
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_has_reflink(mp)) |
|
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 > XFS_MAX_BMBT_EXTLEN) |
|
return __this_address; |
|
|
|
if (cowextsize > mp->m_sb.sb_agblocks / 2) |
|
return __this_address; |
|
|
|
return NULL; |
|
}
|
|
|