diff options
Diffstat (limited to 'fs/xfs/scrub/repair.c')
-rw-r--r-- | fs/xfs/scrub/repair.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/fs/xfs/scrub/repair.c b/fs/xfs/scrub/repair.c index 1f3238bb4eea..a04ee90504e9 100644 --- a/fs/xfs/scrub/repair.c +++ b/fs/xfs/scrub/repair.c @@ -28,11 +28,14 @@ #include "xfs_bmap.h" #include "xfs_defer.h" #include "xfs_extfree_item.h" +#include "xfs_attr.h" +#include "xfs_reflink.h" #include "scrub/scrub.h" #include "scrub/common.h" #include "scrub/trace.h" #include "scrub/repair.h" #include "scrub/bitmap.h" +#include "scrub/xfile.h" /* * Attempt to repair some metadata, if the metadata is corrupt and userspace @@ -1415,3 +1418,256 @@ xrep_buf_verify_struct( return fa == NULL; } + +/* + * Repair the attr/data forks of a metadata inode. The caller must ensure that + * sc->ip points to the metadata inode and the ILOCK is held on that inode. + * The inode must not be joined to the transaction before the call, and will + * not be afterwards. + */ +int +xrep_metadata_inode_forks( + struct xfs_scrub *sc) +{ + __u32 smtype; + __u32 smflags; + bool dirty = false; + int error; + + /* Clear the reflink flag since metadata never shares. */ + if (xfs_is_reflink_inode(sc->ip)) { + dirty = true; + xfs_trans_ijoin(sc->tp, sc->ip, 0); + error = xfs_reflink_clear_inode_flag(sc->ip, &sc->tp); + if (error) + return error; + } + + /* Clear the attr forks since metadata shouldn't have that. */ + if (xfs_inode_hasattr(sc->ip)) { + if (!dirty) { + dirty = true; + xfs_trans_ijoin(sc->tp, sc->ip, 0); + } + error = xrep_xattr_reset_fork(sc); + if (error) + return error; + } + + /* + * If we modified the inode, roll the transaction but don't rejoin the + * inode to the new transaction because xrep_bmap_data can do that. + */ + if (dirty) { + error = xfs_trans_roll(&sc->tp); + if (error) + return error; + dirty = false; + } + + /* + * Let's see if the forks need repair. We're going to open-code calls + * to the bmapbtd scrub and repair functions so that we can hang on to + * the resources that we already acquired instead of using the standard + * setup/teardown routines. + */ + smtype = sc->sm->sm_type; + smflags = sc->sm->sm_flags; + sc->sm->sm_type = XFS_SCRUB_TYPE_BMBTD; + sc->sm->sm_flags &= ~XFS_SCRUB_FLAGS_OUT; + + error = xchk_metadata_inode_forks(sc); + if (error || !xfs_scrub_needs_repair(sc->sm)) + goto out; + + /* + * Repair the data fork. This will potentially join the inode to the + * transaction. + */ + error = xrep_bmap_data(sc); + if (error) + goto out; + + /* + * Roll the transaction but don't rejoin the inode to the new + * transaction because we're done making changes to the inode. + */ + error = xfs_trans_roll(&sc->tp); + if (error) + goto out; + + /* Bail out if we still need repairs. */ + sc->sm->sm_flags &= ~XFS_SCRUB_FLAGS_OUT; + error = xchk_metadata_inode_forks(sc); + if (error) + goto out; + if (xfs_scrub_needs_repair(sc->sm)) + error = -EFSCORRUPTED; +out: + sc->sm->sm_type = smtype; + sc->sm->sm_flags = smflags; + return error; +} + +/* + * Make sure that the given range of the data fork of the metadata file being + * checked is mapped to written blocks. The caller must ensure that the inode + * is joined to the transaction. + */ +int +xrep_fallocate( + struct xfs_scrub *sc, + xfs_fileoff_t off, + xfs_filblks_t len) +{ + struct xfs_bmbt_irec map; + xfs_fileoff_t end = off + len; + int nmaps; + int error = 0; + + error = xrep_ino_dqattach(sc); + if (error) + return error; + + while (off < len) { + /* + * If we have a real extent mapping this block then we're + * in ok shape. + */ + nmaps = 1; + error = xfs_bmapi_read(sc->ip, off, end - off, &map, &nmaps, + XFS_DATA_FORK); + if (error) + break; + + if (nmaps == 1 && xfs_bmap_is_written_extent(&map)) { + off += map.br_startblock; + continue; + } + + /* + * If we find a delalloc reservation then something is very + * very wrong. Bail out. + */ + if (map.br_startblock == DELAYSTARTBLOCK) + return -EFSCORRUPTED; + + /* + * Make sure this rtsum block has a real zeroed extent + * allocated to it. + */ + nmaps = 1; + error = xfs_bmapi_write(sc->tp, sc->ip, off, end - off, + XFS_BMAPI_CONVERT | XFS_BMAPI_ZERO, 0, &map, + &nmaps); + if (error) + break; + + error = xrep_roll_trans(sc); + if (error) + break; + off += map.br_startblock; + } + + return error; +} + +/* + * Write a number of bytes from the xfile into the metadata file being + * examined. The copybuf must be large enough to hold one filesystem block's + * worth of data. The caller must join the inode to the transaction. + */ +int +xrep_set_file_contents( + struct xfs_scrub *sc, + const struct xfs_buf_ops *ops, + enum xfs_blft type, + xfs_fileoff_t isize) +{ + LIST_HEAD(buffers_list); + struct xfs_bmbt_irec map; + struct xfs_mount *mp = sc->mp; + struct xfs_buf *bp; + xfs_rtblock_t off = 0; + loff_t pos = 0; + unsigned int nr_buffers = 0; + int nmaps; + int error = 0; + + ASSERT(S_ISREG(VFS_I(sc->ip)->i_mode)); + + for (; pos < isize; pos += mp->m_sb.sb_blocksize, off++) { + size_t count; + + /* Read block mapping for this file block. */ + nmaps = 1; + error = xfs_bmapi_read(sc->ip, off, 1, &map, &nmaps, 0); + if (error) + goto out; + if (nmaps == 0 || !xfs_bmap_is_written_extent(&map)) { + error = -EFSCORRUPTED; + goto out; + } + + /* Get the metadata buffer for this offset in the file. */ + error = xfs_trans_get_buf(sc->tp, mp->m_ddev_targp, + XFS_FSB_TO_DADDR(mp, map.br_startblock), + mp->m_bsize, 0, &bp); + if (error) + goto out; + bp->b_ops = ops; + xfs_trans_buf_set_type(sc->tp, bp, type); + + /* Read in a block's worth of data from the xfile. */ + count = min_t(loff_t, isize - pos, mp->m_sb.sb_blocksize); + error = xfile_pread(sc->xfile, bp->b_addr, count, pos); + if (error) { + xfs_trans_brelse(sc->tp, bp); + goto out; + } + + /* + * Put this buffer on the delwri list so we can write them all + * out in batches. + */ + xfs_buf_delwri_queue(bp, &buffers_list); + xfs_trans_brelse(sc->tp, bp); + nr_buffers++; + + /* + * If we have more than 256K of data to write out, flush it to + * disk so we don't use up too much memory. + */ + if (XFS_FSB_TO_B(mp, nr_buffers) > 262144) { + error = xfs_buf_delwri_submit(&buffers_list); + if (error) + goto out; + nr_buffers = 0; + } + } + + /* + * Write the new blocks to disk. If the ordered list isn't empty after + * that, then something went wrong and we have to fail. This should + * never happen, but we'll check anyway. + */ + error = xfs_buf_delwri_submit(&buffers_list); + if (error) + goto out; + if (!list_empty(&buffers_list)) { + ASSERT(list_empty(&buffers_list)); + return -EIO; + } + + /* Set the new inode size, if needed. */ + if (sc->ip->i_d.di_size != isize) { + sc->ip->i_d.di_size = isize; + xfs_trans_log_inode(sc->tp, sc->ip, XFS_ILOG_CORE); + return xrep_roll_trans(sc); + } + + return 0; +out: + xfs_buf_delwri_cancel(&buffers_list); + return error; +} |