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969 lines
26 KiB
969 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Copyright (C) 2017 Oracle. All Rights Reserved. |
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* Author: Darrick J. Wong <[email protected]> |
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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_inode.h" |
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#include "xfs_trans.h" |
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#include "xfs_btree.h" |
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#include "xfs_rmap_btree.h" |
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#include "xfs_trace.h" |
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#include "xfs_rmap.h" |
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#include "xfs_alloc.h" |
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#include "xfs_bit.h" |
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#include <linux/fsmap.h> |
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#include "xfs_fsmap.h" |
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#include "xfs_refcount.h" |
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#include "xfs_refcount_btree.h" |
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#include "xfs_alloc_btree.h" |
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#include "xfs_rtalloc.h" |
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#include "xfs_ag.h" |
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|
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/* Convert an xfs_fsmap to an fsmap. */ |
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static void |
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xfs_fsmap_from_internal( |
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struct fsmap *dest, |
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struct xfs_fsmap *src) |
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{ |
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dest->fmr_device = src->fmr_device; |
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dest->fmr_flags = src->fmr_flags; |
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dest->fmr_physical = BBTOB(src->fmr_physical); |
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dest->fmr_owner = src->fmr_owner; |
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dest->fmr_offset = BBTOB(src->fmr_offset); |
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dest->fmr_length = BBTOB(src->fmr_length); |
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dest->fmr_reserved[0] = 0; |
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dest->fmr_reserved[1] = 0; |
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dest->fmr_reserved[2] = 0; |
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} |
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|
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/* Convert an fsmap to an xfs_fsmap. */ |
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void |
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xfs_fsmap_to_internal( |
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struct xfs_fsmap *dest, |
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struct fsmap *src) |
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{ |
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dest->fmr_device = src->fmr_device; |
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dest->fmr_flags = src->fmr_flags; |
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dest->fmr_physical = BTOBBT(src->fmr_physical); |
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dest->fmr_owner = src->fmr_owner; |
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dest->fmr_offset = BTOBBT(src->fmr_offset); |
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dest->fmr_length = BTOBBT(src->fmr_length); |
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} |
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|
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/* Convert an fsmap owner into an rmapbt owner. */ |
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static int |
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xfs_fsmap_owner_to_rmap( |
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struct xfs_rmap_irec *dest, |
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struct xfs_fsmap *src) |
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{ |
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if (!(src->fmr_flags & FMR_OF_SPECIAL_OWNER)) { |
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dest->rm_owner = src->fmr_owner; |
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return 0; |
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} |
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|
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switch (src->fmr_owner) { |
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case 0: /* "lowest owner id possible" */ |
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case -1ULL: /* "highest owner id possible" */ |
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dest->rm_owner = 0; |
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break; |
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case XFS_FMR_OWN_FREE: |
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dest->rm_owner = XFS_RMAP_OWN_NULL; |
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break; |
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case XFS_FMR_OWN_UNKNOWN: |
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dest->rm_owner = XFS_RMAP_OWN_UNKNOWN; |
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break; |
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case XFS_FMR_OWN_FS: |
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dest->rm_owner = XFS_RMAP_OWN_FS; |
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break; |
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case XFS_FMR_OWN_LOG: |
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dest->rm_owner = XFS_RMAP_OWN_LOG; |
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break; |
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case XFS_FMR_OWN_AG: |
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dest->rm_owner = XFS_RMAP_OWN_AG; |
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break; |
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case XFS_FMR_OWN_INOBT: |
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dest->rm_owner = XFS_RMAP_OWN_INOBT; |
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break; |
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case XFS_FMR_OWN_INODES: |
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dest->rm_owner = XFS_RMAP_OWN_INODES; |
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break; |
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case XFS_FMR_OWN_REFC: |
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dest->rm_owner = XFS_RMAP_OWN_REFC; |
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break; |
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case XFS_FMR_OWN_COW: |
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dest->rm_owner = XFS_RMAP_OWN_COW; |
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break; |
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case XFS_FMR_OWN_DEFECTIVE: /* not implemented */ |
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/* fall through */ |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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|
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/* Convert an rmapbt owner into an fsmap owner. */ |
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static int |
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xfs_fsmap_owner_from_rmap( |
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struct xfs_fsmap *dest, |
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struct xfs_rmap_irec *src) |
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{ |
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dest->fmr_flags = 0; |
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if (!XFS_RMAP_NON_INODE_OWNER(src->rm_owner)) { |
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dest->fmr_owner = src->rm_owner; |
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return 0; |
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} |
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dest->fmr_flags |= FMR_OF_SPECIAL_OWNER; |
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switch (src->rm_owner) { |
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case XFS_RMAP_OWN_FS: |
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dest->fmr_owner = XFS_FMR_OWN_FS; |
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break; |
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case XFS_RMAP_OWN_LOG: |
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dest->fmr_owner = XFS_FMR_OWN_LOG; |
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break; |
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case XFS_RMAP_OWN_AG: |
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dest->fmr_owner = XFS_FMR_OWN_AG; |
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break; |
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case XFS_RMAP_OWN_INOBT: |
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dest->fmr_owner = XFS_FMR_OWN_INOBT; |
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break; |
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case XFS_RMAP_OWN_INODES: |
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dest->fmr_owner = XFS_FMR_OWN_INODES; |
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break; |
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case XFS_RMAP_OWN_REFC: |
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dest->fmr_owner = XFS_FMR_OWN_REFC; |
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break; |
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case XFS_RMAP_OWN_COW: |
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dest->fmr_owner = XFS_FMR_OWN_COW; |
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break; |
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case XFS_RMAP_OWN_NULL: /* "free" */ |
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dest->fmr_owner = XFS_FMR_OWN_FREE; |
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break; |
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default: |
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ASSERT(0); |
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return -EFSCORRUPTED; |
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} |
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return 0; |
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} |
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|
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/* getfsmap query state */ |
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struct xfs_getfsmap_info { |
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struct xfs_fsmap_head *head; |
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struct fsmap *fsmap_recs; /* mapping records */ |
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struct xfs_buf *agf_bp; /* AGF, for refcount queries */ |
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struct xfs_perag *pag; /* AG info, if applicable */ |
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xfs_daddr_t next_daddr; /* next daddr we expect */ |
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u64 missing_owner; /* owner of holes */ |
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u32 dev; /* device id */ |
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struct xfs_rmap_irec low; /* low rmap key */ |
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struct xfs_rmap_irec high; /* high rmap key */ |
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bool last; /* last extent? */ |
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}; |
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|
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/* Associate a device with a getfsmap handler. */ |
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struct xfs_getfsmap_dev { |
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u32 dev; |
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int (*fn)(struct xfs_trans *tp, |
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struct xfs_fsmap *keys, |
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struct xfs_getfsmap_info *info); |
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}; |
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|
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/* Compare two getfsmap device handlers. */ |
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static int |
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xfs_getfsmap_dev_compare( |
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const void *p1, |
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const void *p2) |
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{ |
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const struct xfs_getfsmap_dev *d1 = p1; |
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const struct xfs_getfsmap_dev *d2 = p2; |
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return d1->dev - d2->dev; |
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} |
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|
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/* Decide if this mapping is shared. */ |
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STATIC int |
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xfs_getfsmap_is_shared( |
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struct xfs_trans *tp, |
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struct xfs_getfsmap_info *info, |
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struct xfs_rmap_irec *rec, |
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bool *stat) |
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{ |
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struct xfs_mount *mp = tp->t_mountp; |
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struct xfs_btree_cur *cur; |
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xfs_agblock_t fbno; |
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xfs_extlen_t flen; |
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int error; |
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*stat = false; |
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if (!xfs_sb_version_hasreflink(&mp->m_sb)) |
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return 0; |
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/* rt files will have no perag structure */ |
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if (!info->pag) |
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return 0; |
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/* Are there any shared blocks here? */ |
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flen = 0; |
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cur = xfs_refcountbt_init_cursor(mp, tp, info->agf_bp, info->pag); |
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error = xfs_refcount_find_shared(cur, rec->rm_startblock, |
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rec->rm_blockcount, &fbno, &flen, false); |
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xfs_btree_del_cursor(cur, error); |
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if (error) |
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return error; |
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*stat = flen > 0; |
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return 0; |
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} |
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static inline void |
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xfs_getfsmap_format( |
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struct xfs_mount *mp, |
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struct xfs_fsmap *xfm, |
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struct xfs_getfsmap_info *info) |
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{ |
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struct fsmap *rec; |
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trace_xfs_getfsmap_mapping(mp, xfm); |
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rec = &info->fsmap_recs[info->head->fmh_entries++]; |
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xfs_fsmap_from_internal(rec, xfm); |
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} |
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/* |
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* Format a reverse mapping for getfsmap, having translated rm_startblock |
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* into the appropriate daddr units. |
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*/ |
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STATIC int |
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xfs_getfsmap_helper( |
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struct xfs_trans *tp, |
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struct xfs_getfsmap_info *info, |
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struct xfs_rmap_irec *rec, |
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xfs_daddr_t rec_daddr) |
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{ |
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struct xfs_fsmap fmr; |
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struct xfs_mount *mp = tp->t_mountp; |
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bool shared; |
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int error; |
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if (fatal_signal_pending(current)) |
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return -EINTR; |
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/* |
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* Filter out records that start before our startpoint, if the |
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* caller requested that. |
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*/ |
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if (xfs_rmap_compare(rec, &info->low) < 0) { |
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rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount); |
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if (info->next_daddr < rec_daddr) |
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info->next_daddr = rec_daddr; |
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return 0; |
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} |
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/* Are we just counting mappings? */ |
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if (info->head->fmh_count == 0) { |
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if (info->head->fmh_entries == UINT_MAX) |
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return -ECANCELED; |
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if (rec_daddr > info->next_daddr) |
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info->head->fmh_entries++; |
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if (info->last) |
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return 0; |
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info->head->fmh_entries++; |
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rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount); |
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if (info->next_daddr < rec_daddr) |
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info->next_daddr = rec_daddr; |
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return 0; |
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} |
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/* |
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* If the record starts past the last physical block we saw, |
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* then we've found a gap. Report the gap as being owned by |
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* whatever the caller specified is the missing owner. |
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*/ |
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if (rec_daddr > info->next_daddr) { |
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if (info->head->fmh_entries >= info->head->fmh_count) |
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return -ECANCELED; |
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fmr.fmr_device = info->dev; |
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fmr.fmr_physical = info->next_daddr; |
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fmr.fmr_owner = info->missing_owner; |
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fmr.fmr_offset = 0; |
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fmr.fmr_length = rec_daddr - info->next_daddr; |
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fmr.fmr_flags = FMR_OF_SPECIAL_OWNER; |
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xfs_getfsmap_format(mp, &fmr, info); |
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} |
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if (info->last) |
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goto out; |
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/* Fill out the extent we found */ |
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if (info->head->fmh_entries >= info->head->fmh_count) |
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return -ECANCELED; |
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trace_xfs_fsmap_mapping(mp, info->dev, |
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info->pag ? info->pag->pag_agno : NULLAGNUMBER, rec); |
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fmr.fmr_device = info->dev; |
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fmr.fmr_physical = rec_daddr; |
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error = xfs_fsmap_owner_from_rmap(&fmr, rec); |
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if (error) |
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return error; |
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fmr.fmr_offset = XFS_FSB_TO_BB(mp, rec->rm_offset); |
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fmr.fmr_length = XFS_FSB_TO_BB(mp, rec->rm_blockcount); |
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if (rec->rm_flags & XFS_RMAP_UNWRITTEN) |
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fmr.fmr_flags |= FMR_OF_PREALLOC; |
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if (rec->rm_flags & XFS_RMAP_ATTR_FORK) |
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fmr.fmr_flags |= FMR_OF_ATTR_FORK; |
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if (rec->rm_flags & XFS_RMAP_BMBT_BLOCK) |
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fmr.fmr_flags |= FMR_OF_EXTENT_MAP; |
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if (fmr.fmr_flags == 0) { |
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error = xfs_getfsmap_is_shared(tp, info, rec, &shared); |
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if (error) |
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return error; |
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if (shared) |
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fmr.fmr_flags |= FMR_OF_SHARED; |
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} |
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xfs_getfsmap_format(mp, &fmr, info); |
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out: |
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rec_daddr += XFS_FSB_TO_BB(mp, rec->rm_blockcount); |
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if (info->next_daddr < rec_daddr) |
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info->next_daddr = rec_daddr; |
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return 0; |
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} |
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/* Transform a rmapbt irec into a fsmap */ |
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STATIC int |
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xfs_getfsmap_datadev_helper( |
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struct xfs_btree_cur *cur, |
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struct xfs_rmap_irec *rec, |
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void *priv) |
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{ |
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struct xfs_mount *mp = cur->bc_mp; |
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struct xfs_getfsmap_info *info = priv; |
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xfs_fsblock_t fsb; |
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xfs_daddr_t rec_daddr; |
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fsb = XFS_AGB_TO_FSB(mp, cur->bc_ag.pag->pag_agno, rec->rm_startblock); |
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rec_daddr = XFS_FSB_TO_DADDR(mp, fsb); |
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return xfs_getfsmap_helper(cur->bc_tp, info, rec, rec_daddr); |
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} |
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|
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/* Transform a bnobt irec into a fsmap */ |
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STATIC int |
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xfs_getfsmap_datadev_bnobt_helper( |
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struct xfs_btree_cur *cur, |
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struct xfs_alloc_rec_incore *rec, |
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void *priv) |
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{ |
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struct xfs_mount *mp = cur->bc_mp; |
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struct xfs_getfsmap_info *info = priv; |
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struct xfs_rmap_irec irec; |
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xfs_daddr_t rec_daddr; |
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rec_daddr = XFS_AGB_TO_DADDR(mp, cur->bc_ag.pag->pag_agno, |
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rec->ar_startblock); |
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irec.rm_startblock = rec->ar_startblock; |
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irec.rm_blockcount = rec->ar_blockcount; |
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irec.rm_owner = XFS_RMAP_OWN_NULL; /* "free" */ |
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irec.rm_offset = 0; |
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irec.rm_flags = 0; |
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return xfs_getfsmap_helper(cur->bc_tp, info, &irec, rec_daddr); |
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} |
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/* Set rmap flags based on the getfsmap flags */ |
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static void |
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xfs_getfsmap_set_irec_flags( |
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struct xfs_rmap_irec *irec, |
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struct xfs_fsmap *fmr) |
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{ |
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irec->rm_flags = 0; |
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if (fmr->fmr_flags & FMR_OF_ATTR_FORK) |
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irec->rm_flags |= XFS_RMAP_ATTR_FORK; |
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if (fmr->fmr_flags & FMR_OF_EXTENT_MAP) |
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irec->rm_flags |= XFS_RMAP_BMBT_BLOCK; |
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if (fmr->fmr_flags & FMR_OF_PREALLOC) |
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irec->rm_flags |= XFS_RMAP_UNWRITTEN; |
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} |
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/* Execute a getfsmap query against the log device. */ |
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STATIC int |
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xfs_getfsmap_logdev( |
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struct xfs_trans *tp, |
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struct xfs_fsmap *keys, |
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struct xfs_getfsmap_info *info) |
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{ |
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struct xfs_mount *mp = tp->t_mountp; |
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struct xfs_rmap_irec rmap; |
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int error; |
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/* Set up search keys */ |
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info->low.rm_startblock = XFS_BB_TO_FSBT(mp, keys[0].fmr_physical); |
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info->low.rm_offset = XFS_BB_TO_FSBT(mp, keys[0].fmr_offset); |
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error = xfs_fsmap_owner_to_rmap(&info->low, keys); |
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if (error) |
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return error; |
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info->low.rm_blockcount = 0; |
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xfs_getfsmap_set_irec_flags(&info->low, &keys[0]); |
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|
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error = xfs_fsmap_owner_to_rmap(&info->high, keys + 1); |
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if (error) |
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return error; |
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info->high.rm_startblock = -1U; |
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info->high.rm_owner = ULLONG_MAX; |
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info->high.rm_offset = ULLONG_MAX; |
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info->high.rm_blockcount = 0; |
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info->high.rm_flags = XFS_RMAP_KEY_FLAGS | XFS_RMAP_REC_FLAGS; |
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info->missing_owner = XFS_FMR_OWN_FREE; |
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|
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trace_xfs_fsmap_low_key(mp, info->dev, NULLAGNUMBER, &info->low); |
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trace_xfs_fsmap_high_key(mp, info->dev, NULLAGNUMBER, &info->high); |
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|
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if (keys[0].fmr_physical > 0) |
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return 0; |
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|
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/* Fabricate an rmap entry for the external log device. */ |
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rmap.rm_startblock = 0; |
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rmap.rm_blockcount = mp->m_sb.sb_logblocks; |
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rmap.rm_owner = XFS_RMAP_OWN_LOG; |
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rmap.rm_offset = 0; |
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rmap.rm_flags = 0; |
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return xfs_getfsmap_helper(tp, info, &rmap, 0); |
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} |
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|
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#ifdef CONFIG_XFS_RT |
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/* Transform a rtbitmap "record" into a fsmap */ |
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STATIC int |
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xfs_getfsmap_rtdev_rtbitmap_helper( |
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struct xfs_trans *tp, |
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struct xfs_rtalloc_rec *rec, |
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void *priv) |
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{ |
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struct xfs_mount *mp = tp->t_mountp; |
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struct xfs_getfsmap_info *info = priv; |
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struct xfs_rmap_irec irec; |
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xfs_daddr_t rec_daddr; |
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|
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irec.rm_startblock = rec->ar_startext * mp->m_sb.sb_rextsize; |
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rec_daddr = XFS_FSB_TO_BB(mp, irec.rm_startblock); |
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irec.rm_blockcount = rec->ar_extcount * mp->m_sb.sb_rextsize; |
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irec.rm_owner = XFS_RMAP_OWN_NULL; /* "free" */ |
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irec.rm_offset = 0; |
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irec.rm_flags = 0; |
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|
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return xfs_getfsmap_helper(tp, info, &irec, rec_daddr); |
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} |
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|
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/* Execute a getfsmap query against the realtime device. */ |
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STATIC int |
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__xfs_getfsmap_rtdev( |
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struct xfs_trans *tp, |
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struct xfs_fsmap *keys, |
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int (*query_fn)(struct xfs_trans *, |
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struct xfs_getfsmap_info *), |
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struct xfs_getfsmap_info *info) |
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{ |
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struct xfs_mount *mp = tp->t_mountp; |
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xfs_fsblock_t start_fsb; |
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xfs_fsblock_t end_fsb; |
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xfs_daddr_t eofs; |
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int error = 0; |
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|
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eofs = XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks); |
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if (keys[0].fmr_physical >= eofs) |
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return 0; |
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if (keys[1].fmr_physical >= eofs) |
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keys[1].fmr_physical = eofs - 1; |
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start_fsb = XFS_BB_TO_FSBT(mp, keys[0].fmr_physical); |
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end_fsb = XFS_BB_TO_FSB(mp, keys[1].fmr_physical); |
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|
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/* Set up search keys */ |
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info->low.rm_startblock = start_fsb; |
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error = xfs_fsmap_owner_to_rmap(&info->low, &keys[0]); |
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if (error) |
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return error; |
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info->low.rm_offset = XFS_BB_TO_FSBT(mp, keys[0].fmr_offset); |
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info->low.rm_blockcount = 0; |
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xfs_getfsmap_set_irec_flags(&info->low, &keys[0]); |
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|
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info->high.rm_startblock = end_fsb; |
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error = xfs_fsmap_owner_to_rmap(&info->high, &keys[1]); |
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if (error) |
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return error; |
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info->high.rm_offset = XFS_BB_TO_FSBT(mp, keys[1].fmr_offset); |
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info->high.rm_blockcount = 0; |
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xfs_getfsmap_set_irec_flags(&info->high, &keys[1]); |
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|
|
trace_xfs_fsmap_low_key(mp, info->dev, NULLAGNUMBER, &info->low); |
|
trace_xfs_fsmap_high_key(mp, info->dev, NULLAGNUMBER, &info->high); |
|
|
|
return query_fn(tp, info); |
|
} |
|
|
|
/* Actually query the realtime bitmap. */ |
|
STATIC int |
|
xfs_getfsmap_rtdev_rtbitmap_query( |
|
struct xfs_trans *tp, |
|
struct xfs_getfsmap_info *info) |
|
{ |
|
struct xfs_rtalloc_rec alow = { 0 }; |
|
struct xfs_rtalloc_rec ahigh = { 0 }; |
|
int error; |
|
|
|
xfs_ilock(tp->t_mountp->m_rbmip, XFS_ILOCK_SHARED); |
|
|
|
alow.ar_startext = info->low.rm_startblock; |
|
ahigh.ar_startext = info->high.rm_startblock; |
|
do_div(alow.ar_startext, tp->t_mountp->m_sb.sb_rextsize); |
|
if (do_div(ahigh.ar_startext, tp->t_mountp->m_sb.sb_rextsize)) |
|
ahigh.ar_startext++; |
|
error = xfs_rtalloc_query_range(tp, &alow, &ahigh, |
|
xfs_getfsmap_rtdev_rtbitmap_helper, info); |
|
if (error) |
|
goto err; |
|
|
|
/* Report any gaps at the end of the rtbitmap */ |
|
info->last = true; |
|
error = xfs_getfsmap_rtdev_rtbitmap_helper(tp, &ahigh, info); |
|
if (error) |
|
goto err; |
|
err: |
|
xfs_iunlock(tp->t_mountp->m_rbmip, XFS_ILOCK_SHARED); |
|
return error; |
|
} |
|
|
|
/* Execute a getfsmap query against the realtime device rtbitmap. */ |
|
STATIC int |
|
xfs_getfsmap_rtdev_rtbitmap( |
|
struct xfs_trans *tp, |
|
struct xfs_fsmap *keys, |
|
struct xfs_getfsmap_info *info) |
|
{ |
|
info->missing_owner = XFS_FMR_OWN_UNKNOWN; |
|
return __xfs_getfsmap_rtdev(tp, keys, xfs_getfsmap_rtdev_rtbitmap_query, |
|
info); |
|
} |
|
#endif /* CONFIG_XFS_RT */ |
|
|
|
/* Execute a getfsmap query against the regular data device. */ |
|
STATIC int |
|
__xfs_getfsmap_datadev( |
|
struct xfs_trans *tp, |
|
struct xfs_fsmap *keys, |
|
struct xfs_getfsmap_info *info, |
|
int (*query_fn)(struct xfs_trans *, |
|
struct xfs_getfsmap_info *, |
|
struct xfs_btree_cur **, |
|
void *), |
|
void *priv) |
|
{ |
|
struct xfs_mount *mp = tp->t_mountp; |
|
struct xfs_perag *pag; |
|
struct xfs_btree_cur *bt_cur = NULL; |
|
xfs_fsblock_t start_fsb; |
|
xfs_fsblock_t end_fsb; |
|
xfs_agnumber_t start_ag; |
|
xfs_agnumber_t end_ag; |
|
xfs_daddr_t eofs; |
|
int error = 0; |
|
|
|
eofs = XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks); |
|
if (keys[0].fmr_physical >= eofs) |
|
return 0; |
|
if (keys[1].fmr_physical >= eofs) |
|
keys[1].fmr_physical = eofs - 1; |
|
start_fsb = XFS_DADDR_TO_FSB(mp, keys[0].fmr_physical); |
|
end_fsb = XFS_DADDR_TO_FSB(mp, keys[1].fmr_physical); |
|
|
|
/* |
|
* Convert the fsmap low/high keys to AG based keys. Initialize |
|
* low to the fsmap low key and max out the high key to the end |
|
* of the AG. |
|
*/ |
|
info->low.rm_startblock = XFS_FSB_TO_AGBNO(mp, start_fsb); |
|
info->low.rm_offset = XFS_BB_TO_FSBT(mp, keys[0].fmr_offset); |
|
error = xfs_fsmap_owner_to_rmap(&info->low, &keys[0]); |
|
if (error) |
|
return error; |
|
info->low.rm_blockcount = 0; |
|
xfs_getfsmap_set_irec_flags(&info->low, &keys[0]); |
|
|
|
info->high.rm_startblock = -1U; |
|
info->high.rm_owner = ULLONG_MAX; |
|
info->high.rm_offset = ULLONG_MAX; |
|
info->high.rm_blockcount = 0; |
|
info->high.rm_flags = XFS_RMAP_KEY_FLAGS | XFS_RMAP_REC_FLAGS; |
|
|
|
start_ag = XFS_FSB_TO_AGNO(mp, start_fsb); |
|
end_ag = XFS_FSB_TO_AGNO(mp, end_fsb); |
|
|
|
for_each_perag_range(mp, start_ag, end_ag, pag) { |
|
/* |
|
* Set the AG high key from the fsmap high key if this |
|
* is the last AG that we're querying. |
|
*/ |
|
info->pag = pag; |
|
if (pag->pag_agno == end_ag) { |
|
info->high.rm_startblock = XFS_FSB_TO_AGBNO(mp, |
|
end_fsb); |
|
info->high.rm_offset = XFS_BB_TO_FSBT(mp, |
|
keys[1].fmr_offset); |
|
error = xfs_fsmap_owner_to_rmap(&info->high, &keys[1]); |
|
if (error) |
|
break; |
|
xfs_getfsmap_set_irec_flags(&info->high, &keys[1]); |
|
} |
|
|
|
if (bt_cur) { |
|
xfs_btree_del_cursor(bt_cur, XFS_BTREE_NOERROR); |
|
bt_cur = NULL; |
|
xfs_trans_brelse(tp, info->agf_bp); |
|
info->agf_bp = NULL; |
|
} |
|
|
|
error = xfs_alloc_read_agf(mp, tp, pag->pag_agno, 0, |
|
&info->agf_bp); |
|
if (error) |
|
break; |
|
|
|
trace_xfs_fsmap_low_key(mp, info->dev, pag->pag_agno, |
|
&info->low); |
|
trace_xfs_fsmap_high_key(mp, info->dev, pag->pag_agno, |
|
&info->high); |
|
|
|
error = query_fn(tp, info, &bt_cur, priv); |
|
if (error) |
|
break; |
|
|
|
/* |
|
* Set the AG low key to the start of the AG prior to |
|
* moving on to the next AG. |
|
*/ |
|
if (pag->pag_agno == start_ag) { |
|
info->low.rm_startblock = 0; |
|
info->low.rm_owner = 0; |
|
info->low.rm_offset = 0; |
|
info->low.rm_flags = 0; |
|
} |
|
|
|
/* |
|
* If this is the last AG, report any gap at the end of it |
|
* before we drop the reference to the perag when the loop |
|
* terminates. |
|
*/ |
|
if (pag->pag_agno == end_ag) { |
|
info->last = true; |
|
error = query_fn(tp, info, &bt_cur, priv); |
|
if (error) |
|
break; |
|
} |
|
info->pag = NULL; |
|
} |
|
|
|
if (bt_cur) |
|
xfs_btree_del_cursor(bt_cur, error < 0 ? XFS_BTREE_ERROR : |
|
XFS_BTREE_NOERROR); |
|
if (info->agf_bp) { |
|
xfs_trans_brelse(tp, info->agf_bp); |
|
info->agf_bp = NULL; |
|
} |
|
if (info->pag) { |
|
xfs_perag_put(info->pag); |
|
info->pag = NULL; |
|
} else if (pag) { |
|
/* loop termination case */ |
|
xfs_perag_put(pag); |
|
} |
|
|
|
return error; |
|
} |
|
|
|
/* Actually query the rmap btree. */ |
|
STATIC int |
|
xfs_getfsmap_datadev_rmapbt_query( |
|
struct xfs_trans *tp, |
|
struct xfs_getfsmap_info *info, |
|
struct xfs_btree_cur **curpp, |
|
void *priv) |
|
{ |
|
/* Report any gap at the end of the last AG. */ |
|
if (info->last) |
|
return xfs_getfsmap_datadev_helper(*curpp, &info->high, info); |
|
|
|
/* Allocate cursor for this AG and query_range it. */ |
|
*curpp = xfs_rmapbt_init_cursor(tp->t_mountp, tp, info->agf_bp, |
|
info->pag); |
|
return xfs_rmap_query_range(*curpp, &info->low, &info->high, |
|
xfs_getfsmap_datadev_helper, info); |
|
} |
|
|
|
/* Execute a getfsmap query against the regular data device rmapbt. */ |
|
STATIC int |
|
xfs_getfsmap_datadev_rmapbt( |
|
struct xfs_trans *tp, |
|
struct xfs_fsmap *keys, |
|
struct xfs_getfsmap_info *info) |
|
{ |
|
info->missing_owner = XFS_FMR_OWN_FREE; |
|
return __xfs_getfsmap_datadev(tp, keys, info, |
|
xfs_getfsmap_datadev_rmapbt_query, NULL); |
|
} |
|
|
|
/* Actually query the bno btree. */ |
|
STATIC int |
|
xfs_getfsmap_datadev_bnobt_query( |
|
struct xfs_trans *tp, |
|
struct xfs_getfsmap_info *info, |
|
struct xfs_btree_cur **curpp, |
|
void *priv) |
|
{ |
|
struct xfs_alloc_rec_incore *key = priv; |
|
|
|
/* Report any gap at the end of the last AG. */ |
|
if (info->last) |
|
return xfs_getfsmap_datadev_bnobt_helper(*curpp, &key[1], info); |
|
|
|
/* Allocate cursor for this AG and query_range it. */ |
|
*curpp = xfs_allocbt_init_cursor(tp->t_mountp, tp, info->agf_bp, |
|
info->pag, XFS_BTNUM_BNO); |
|
key->ar_startblock = info->low.rm_startblock; |
|
key[1].ar_startblock = info->high.rm_startblock; |
|
return xfs_alloc_query_range(*curpp, key, &key[1], |
|
xfs_getfsmap_datadev_bnobt_helper, info); |
|
} |
|
|
|
/* Execute a getfsmap query against the regular data device's bnobt. */ |
|
STATIC int |
|
xfs_getfsmap_datadev_bnobt( |
|
struct xfs_trans *tp, |
|
struct xfs_fsmap *keys, |
|
struct xfs_getfsmap_info *info) |
|
{ |
|
struct xfs_alloc_rec_incore akeys[2]; |
|
|
|
info->missing_owner = XFS_FMR_OWN_UNKNOWN; |
|
return __xfs_getfsmap_datadev(tp, keys, info, |
|
xfs_getfsmap_datadev_bnobt_query, &akeys[0]); |
|
} |
|
|
|
/* Do we recognize the device? */ |
|
STATIC bool |
|
xfs_getfsmap_is_valid_device( |
|
struct xfs_mount *mp, |
|
struct xfs_fsmap *fm) |
|
{ |
|
if (fm->fmr_device == 0 || fm->fmr_device == UINT_MAX || |
|
fm->fmr_device == new_encode_dev(mp->m_ddev_targp->bt_dev)) |
|
return true; |
|
if (mp->m_logdev_targp && |
|
fm->fmr_device == new_encode_dev(mp->m_logdev_targp->bt_dev)) |
|
return true; |
|
if (mp->m_rtdev_targp && |
|
fm->fmr_device == new_encode_dev(mp->m_rtdev_targp->bt_dev)) |
|
return true; |
|
return false; |
|
} |
|
|
|
/* Ensure that the low key is less than the high key. */ |
|
STATIC bool |
|
xfs_getfsmap_check_keys( |
|
struct xfs_fsmap *low_key, |
|
struct xfs_fsmap *high_key) |
|
{ |
|
if (low_key->fmr_device > high_key->fmr_device) |
|
return false; |
|
if (low_key->fmr_device < high_key->fmr_device) |
|
return true; |
|
|
|
if (low_key->fmr_physical > high_key->fmr_physical) |
|
return false; |
|
if (low_key->fmr_physical < high_key->fmr_physical) |
|
return true; |
|
|
|
if (low_key->fmr_owner > high_key->fmr_owner) |
|
return false; |
|
if (low_key->fmr_owner < high_key->fmr_owner) |
|
return true; |
|
|
|
if (low_key->fmr_offset > high_key->fmr_offset) |
|
return false; |
|
if (low_key->fmr_offset < high_key->fmr_offset) |
|
return true; |
|
|
|
return false; |
|
} |
|
|
|
/* |
|
* There are only two devices if we didn't configure RT devices at build time. |
|
*/ |
|
#ifdef CONFIG_XFS_RT |
|
#define XFS_GETFSMAP_DEVS 3 |
|
#else |
|
#define XFS_GETFSMAP_DEVS 2 |
|
#endif /* CONFIG_XFS_RT */ |
|
|
|
/* |
|
* Get filesystem's extents as described in head, and format for output. Fills |
|
* in the supplied records array until there are no more reverse mappings to |
|
* return or head.fmh_entries == head.fmh_count. In the second case, this |
|
* function returns -ECANCELED to indicate that more records would have been |
|
* returned. |
|
* |
|
* Key to Confusion |
|
* ---------------- |
|
* There are multiple levels of keys and counters at work here: |
|
* xfs_fsmap_head.fmh_keys -- low and high fsmap keys passed in; |
|
* these reflect fs-wide sector addrs. |
|
* dkeys -- fmh_keys used to query each device; |
|
* these are fmh_keys but w/ the low key |
|
* bumped up by fmr_length. |
|
* xfs_getfsmap_info.next_daddr -- next disk addr we expect to see; this |
|
* is how we detect gaps in the fsmap |
|
records and report them. |
|
* xfs_getfsmap_info.low/high -- per-AG low/high keys computed from |
|
* dkeys; used to query the metadata. |
|
*/ |
|
int |
|
xfs_getfsmap( |
|
struct xfs_mount *mp, |
|
struct xfs_fsmap_head *head, |
|
struct fsmap *fsmap_recs) |
|
{ |
|
struct xfs_trans *tp = NULL; |
|
struct xfs_fsmap dkeys[2]; /* per-dev keys */ |
|
struct xfs_getfsmap_dev handlers[XFS_GETFSMAP_DEVS]; |
|
struct xfs_getfsmap_info info = { NULL }; |
|
bool use_rmap; |
|
int i; |
|
int error = 0; |
|
|
|
if (head->fmh_iflags & ~FMH_IF_VALID) |
|
return -EINVAL; |
|
if (!xfs_getfsmap_is_valid_device(mp, &head->fmh_keys[0]) || |
|
!xfs_getfsmap_is_valid_device(mp, &head->fmh_keys[1])) |
|
return -EINVAL; |
|
|
|
use_rmap = capable(CAP_SYS_ADMIN) && |
|
xfs_sb_version_hasrmapbt(&mp->m_sb); |
|
head->fmh_entries = 0; |
|
|
|
/* Set up our device handlers. */ |
|
memset(handlers, 0, sizeof(handlers)); |
|
handlers[0].dev = new_encode_dev(mp->m_ddev_targp->bt_dev); |
|
if (use_rmap) |
|
handlers[0].fn = xfs_getfsmap_datadev_rmapbt; |
|
else |
|
handlers[0].fn = xfs_getfsmap_datadev_bnobt; |
|
if (mp->m_logdev_targp != mp->m_ddev_targp) { |
|
handlers[1].dev = new_encode_dev(mp->m_logdev_targp->bt_dev); |
|
handlers[1].fn = xfs_getfsmap_logdev; |
|
} |
|
#ifdef CONFIG_XFS_RT |
|
if (mp->m_rtdev_targp) { |
|
handlers[2].dev = new_encode_dev(mp->m_rtdev_targp->bt_dev); |
|
handlers[2].fn = xfs_getfsmap_rtdev_rtbitmap; |
|
} |
|
#endif /* CONFIG_XFS_RT */ |
|
|
|
xfs_sort(handlers, XFS_GETFSMAP_DEVS, sizeof(struct xfs_getfsmap_dev), |
|
xfs_getfsmap_dev_compare); |
|
|
|
/* |
|
* To continue where we left off, we allow userspace to use the |
|
* last mapping from a previous call as the low key of the next. |
|
* This is identified by a non-zero length in the low key. We |
|
* have to increment the low key in this scenario to ensure we |
|
* don't return the same mapping again, and instead return the |
|
* very next mapping. |
|
* |
|
* If the low key mapping refers to file data, the same physical |
|
* blocks could be mapped to several other files/offsets. |
|
* According to rmapbt record ordering, the minimal next |
|
* possible record for the block range is the next starting |
|
* offset in the same inode. Therefore, bump the file offset to |
|
* continue the search appropriately. For all other low key |
|
* mapping types (attr blocks, metadata), bump the physical |
|
* offset as there can be no other mapping for the same physical |
|
* block range. |
|
*/ |
|
dkeys[0] = head->fmh_keys[0]; |
|
if (dkeys[0].fmr_flags & (FMR_OF_SPECIAL_OWNER | FMR_OF_EXTENT_MAP)) { |
|
dkeys[0].fmr_physical += dkeys[0].fmr_length; |
|
dkeys[0].fmr_owner = 0; |
|
if (dkeys[0].fmr_offset) |
|
return -EINVAL; |
|
} else |
|
dkeys[0].fmr_offset += dkeys[0].fmr_length; |
|
dkeys[0].fmr_length = 0; |
|
memset(&dkeys[1], 0xFF, sizeof(struct xfs_fsmap)); |
|
|
|
if (!xfs_getfsmap_check_keys(dkeys, &head->fmh_keys[1])) |
|
return -EINVAL; |
|
|
|
info.next_daddr = head->fmh_keys[0].fmr_physical + |
|
head->fmh_keys[0].fmr_length; |
|
info.fsmap_recs = fsmap_recs; |
|
info.head = head; |
|
|
|
/* For each device we support... */ |
|
for (i = 0; i < XFS_GETFSMAP_DEVS; i++) { |
|
/* Is this device within the range the user asked for? */ |
|
if (!handlers[i].fn) |
|
continue; |
|
if (head->fmh_keys[0].fmr_device > handlers[i].dev) |
|
continue; |
|
if (head->fmh_keys[1].fmr_device < handlers[i].dev) |
|
break; |
|
|
|
/* |
|
* If this device number matches the high key, we have |
|
* to pass the high key to the handler to limit the |
|
* query results. If the device number exceeds the |
|
* low key, zero out the low key so that we get |
|
* everything from the beginning. |
|
*/ |
|
if (handlers[i].dev == head->fmh_keys[1].fmr_device) |
|
dkeys[1] = head->fmh_keys[1]; |
|
if (handlers[i].dev > head->fmh_keys[0].fmr_device) |
|
memset(&dkeys[0], 0, sizeof(struct xfs_fsmap)); |
|
|
|
/* |
|
* Grab an empty transaction so that we can use its recursive |
|
* buffer locking abilities to detect cycles in the rmapbt |
|
* without deadlocking. |
|
*/ |
|
error = xfs_trans_alloc_empty(mp, &tp); |
|
if (error) |
|
break; |
|
|
|
info.dev = handlers[i].dev; |
|
info.last = false; |
|
info.pag = NULL; |
|
error = handlers[i].fn(tp, dkeys, &info); |
|
if (error) |
|
break; |
|
xfs_trans_cancel(tp); |
|
tp = NULL; |
|
info.next_daddr = 0; |
|
} |
|
|
|
if (tp) |
|
xfs_trans_cancel(tp); |
|
head->fmh_oflags = FMH_OF_DEV_T; |
|
return error; |
|
}
|
|
|