^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (c) 2000-2005 Silicon Graphics, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (c) 2013 Red Hat, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * All Rights Reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include "xfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include "xfs_fs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include "xfs_shared.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include "xfs_format.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include "xfs_log_format.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include "xfs_trans_resv.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "xfs_mount.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include "xfs_inode.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "xfs_dir2.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "xfs_dir2_priv.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "xfs_trace.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include "xfs_bmap.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include "xfs_trans.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "xfs_error.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * Directory file type support functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static unsigned char xfs_dir3_filetype_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) DT_FIFO, DT_SOCK, DT_LNK, DT_WHT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) unsigned char
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) xfs_dir3_get_dtype(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct xfs_mount *mp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) uint8_t filetype)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) if (!xfs_sb_version_hasftype(&mp->m_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return DT_UNKNOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) if (filetype >= XFS_DIR3_FT_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) return DT_UNKNOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) return xfs_dir3_filetype_table[filetype];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) STATIC int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) xfs_dir2_sf_getdents(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct xfs_da_args *args,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct dir_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) int i; /* shortform entry number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct xfs_inode *dp = args->dp; /* incore directory inode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct xfs_mount *mp = dp->i_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) xfs_dir2_dataptr_t off; /* current entry's offset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) xfs_dir2_dataptr_t dot_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) xfs_dir2_dataptr_t dotdot_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) xfs_ino_t ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct xfs_da_geometry *geo = args->geo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) ASSERT(dp->i_df.if_u1.if_data != NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * If the block number in the offset is out of range, we're done.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (xfs_dir2_dataptr_to_db(geo, ctx->pos) > geo->datablk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * Precalculate offsets for "." and ".." as we will always need them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * This relies on the fact that directories always start with the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * entries for "." and "..".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) dot_offset = xfs_dir2_db_off_to_dataptr(geo, geo->datablk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) geo->data_entry_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) dotdot_offset = xfs_dir2_db_off_to_dataptr(geo, geo->datablk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) geo->data_entry_offset +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) xfs_dir2_data_entsize(mp, sizeof(".") - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * Put . entry unless we're starting past it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (ctx->pos <= dot_offset) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) ctx->pos = dot_offset & 0x7fffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (!dir_emit(ctx, ".", 1, dp->i_ino, DT_DIR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * Put .. entry unless we're starting past it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (ctx->pos <= dotdot_offset) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) ino = xfs_dir2_sf_get_parent_ino(sfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) ctx->pos = dotdot_offset & 0x7fffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (!dir_emit(ctx, "..", 2, ino, DT_DIR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * Loop while there are more entries and put'ing works.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) sfep = xfs_dir2_sf_firstentry(sfp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) for (i = 0; i < sfp->count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) uint8_t filetype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) off = xfs_dir2_db_off_to_dataptr(geo, geo->datablk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) xfs_dir2_sf_get_offset(sfep));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (ctx->pos > off) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) ino = xfs_dir2_sf_get_ino(mp, sfp, sfep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) filetype = xfs_dir2_sf_get_ftype(mp, sfep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) ctx->pos = off & 0x7fffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (XFS_IS_CORRUPT(dp->i_mount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) !xfs_dir2_namecheck(sfep->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) sfep->namelen)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return -EFSCORRUPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (!dir_emit(ctx, (char *)sfep->name, sfep->namelen, ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) xfs_dir3_get_dtype(mp, filetype)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) ctx->pos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk + 1, 0) &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 0x7fffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) * Readdir for block directories.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) STATIC int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) xfs_dir2_block_getdents(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) struct xfs_da_args *args,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) struct dir_context *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) struct xfs_inode *dp = args->dp; /* incore directory inode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) struct xfs_buf *bp; /* buffer for block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) int error; /* error return value */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) int wantoff; /* starting block offset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) xfs_off_t cook;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) struct xfs_da_geometry *geo = args->geo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) int lock_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) unsigned int offset, next_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) unsigned int end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * If the block number in the offset is out of range, we're done.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (xfs_dir2_dataptr_to_db(geo, ctx->pos) > geo->datablk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) lock_mode = xfs_ilock_data_map_shared(dp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) error = xfs_dir3_block_read(args->trans, dp, &bp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) xfs_iunlock(dp, lock_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * Extract the byte offset we start at from the seek pointer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) * We'll skip entries before this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) wantoff = xfs_dir2_dataptr_to_off(geo, ctx->pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) xfs_dir3_data_check(dp, bp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * Loop over the data portion of the block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * Each object is a real entry (dep) or an unused one (dup).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) end = xfs_dir3_data_end_offset(geo, bp->b_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) for (offset = geo->data_entry_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) offset < end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) offset = next_offset) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) struct xfs_dir2_data_unused *dup = bp->b_addr + offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) struct xfs_dir2_data_entry *dep = bp->b_addr + offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) uint8_t filetype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) * Unused, skip it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) next_offset = offset + be16_to_cpu(dup->length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) * Bump pointer for the next iteration.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) next_offset = offset +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) xfs_dir2_data_entsize(dp->i_mount, dep->namelen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) * The entry is before the desired starting point, skip it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) if (offset < wantoff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) cook = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) ctx->pos = cook & 0x7fffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) filetype = xfs_dir2_data_get_ftype(dp->i_mount, dep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * If it didn't fit, set the final offset to here & return.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (XFS_IS_CORRUPT(dp->i_mount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) !xfs_dir2_namecheck(dep->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) dep->namelen))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) error = -EFSCORRUPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) goto out_rele;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) if (!dir_emit(ctx, (char *)dep->name, dep->namelen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) be64_to_cpu(dep->inumber),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) xfs_dir3_get_dtype(dp->i_mount, filetype)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) goto out_rele;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) * Reached the end of the block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) * Set the offset to a non-existent block 1 and return.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) ctx->pos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk + 1, 0) &
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 0x7fffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) out_rele:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) xfs_trans_brelse(args->trans, bp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) * Read a directory block and initiate readahead for blocks beyond that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) * We maintain a sliding readahead window of the remaining space in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) * buffer rounded up to the nearest block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) STATIC int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) xfs_dir2_leaf_readbuf(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) struct xfs_da_args *args,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) size_t bufsize,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) xfs_dir2_off_t *cur_off,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) xfs_dablk_t *ra_blk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) struct xfs_buf **bpp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) struct xfs_inode *dp = args->dp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) struct xfs_buf *bp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) struct xfs_da_geometry *geo = args->geo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) struct xfs_ifork *ifp = XFS_IFORK_PTR(dp, XFS_DATA_FORK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) struct xfs_bmbt_irec map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) struct blk_plug plug;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) xfs_dir2_off_t new_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) xfs_dablk_t next_ra;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) xfs_dablk_t map_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) xfs_dablk_t last_da;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) struct xfs_iext_cursor icur;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) int ra_want;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) int error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if (!(ifp->if_flags & XFS_IFEXTENTS)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) error = xfs_iread_extents(args->trans, dp, XFS_DATA_FORK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) * Look for mapped directory blocks at or above the current offset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) * Truncate down to the nearest directory block to start the scanning
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) * operation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) last_da = xfs_dir2_byte_to_da(geo, XFS_DIR2_LEAF_OFFSET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) map_off = xfs_dir2_db_to_da(geo, xfs_dir2_byte_to_db(geo, *cur_off));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) if (!xfs_iext_lookup_extent(dp, ifp, map_off, &icur, &map))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (map.br_startoff >= last_da)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) xfs_trim_extent(&map, map_off, last_da - map_off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) /* Read the directory block of that first mapping. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) new_off = xfs_dir2_da_to_byte(geo, map.br_startoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (new_off > *cur_off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) *cur_off = new_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) error = xfs_dir3_data_read(args->trans, dp, map.br_startoff, 0, &bp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) * Start readahead for the next bufsize's worth of dir data blocks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) * We may have already issued readahead for some of that range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) * ra_blk tracks the last block we tried to read(ahead).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) ra_want = howmany(bufsize + geo->blksize, (1 << geo->fsblog));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) if (*ra_blk >= last_da)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) else if (*ra_blk == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) *ra_blk = map.br_startoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) next_ra = map.br_startoff + geo->fsbcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) if (next_ra >= last_da)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) goto out_no_ra;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (map.br_blockcount < geo->fsbcount &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) !xfs_iext_next_extent(ifp, &icur, &map))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) goto out_no_ra;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) if (map.br_startoff >= last_da)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) goto out_no_ra;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) xfs_trim_extent(&map, next_ra, last_da - next_ra);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) /* Start ra for each dir (not fs) block that has a mapping. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) blk_start_plug(&plug);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) while (ra_want > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) next_ra = roundup((xfs_dablk_t)map.br_startoff, geo->fsbcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) while (ra_want > 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) next_ra < map.br_startoff + map.br_blockcount) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (next_ra >= last_da) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) *ra_blk = last_da;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) if (next_ra > *ra_blk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) xfs_dir3_data_readahead(dp, next_ra,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) XFS_DABUF_MAP_HOLE_OK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) *ra_blk = next_ra;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) ra_want -= geo->fsbcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) next_ra += geo->fsbcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) if (!xfs_iext_next_extent(ifp, &icur, &map)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) *ra_blk = last_da;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) blk_finish_plug(&plug);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) *bpp = bp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) out_no_ra:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) *ra_blk = last_da;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) * Getdents (readdir) for leaf and node directories.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * This reads the data blocks only, so is the same for both forms.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) STATIC int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) xfs_dir2_leaf_getdents(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) struct xfs_da_args *args,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) struct dir_context *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) size_t bufsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) struct xfs_inode *dp = args->dp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) struct xfs_mount *mp = dp->i_mount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) struct xfs_buf *bp = NULL; /* data block buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) xfs_dir2_data_entry_t *dep; /* data entry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) xfs_dir2_data_unused_t *dup; /* unused entry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) struct xfs_da_geometry *geo = args->geo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) xfs_dablk_t rablk = 0; /* current readahead block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) xfs_dir2_off_t curoff; /* current overall offset */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) int length; /* temporary length value */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) int byteoff; /* offset in current block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) int lock_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) unsigned int offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) int error = 0; /* error return value */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) * If the offset is at or past the largest allowed value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) * give up right away.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) if (ctx->pos >= XFS_DIR2_MAX_DATAPTR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) * Inside the loop we keep the main offset value as a byte offset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * in the directory file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) curoff = xfs_dir2_dataptr_to_byte(ctx->pos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) * Loop over directory entries until we reach the end offset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) * Get more blocks and readahead as necessary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) while (curoff < XFS_DIR2_LEAF_OFFSET) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) uint8_t filetype;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) * If we have no buffer, or we're off the end of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) * current buffer, need to get another one.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) if (!bp || offset >= geo->blksize) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) if (bp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) xfs_trans_brelse(args->trans, bp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) bp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) lock_mode = xfs_ilock_data_map_shared(dp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) error = xfs_dir2_leaf_readbuf(args, bufsize, &curoff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) &rablk, &bp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) xfs_iunlock(dp, lock_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) if (error || !bp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) xfs_dir3_data_check(dp, bp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) * Find our position in the block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) offset = geo->data_entry_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) byteoff = xfs_dir2_byte_to_off(geo, curoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) * Skip past the header.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) if (byteoff == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) curoff += geo->data_entry_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) * Skip past entries until we reach our offset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) while (offset < byteoff) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) dup = bp->b_addr + offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) if (be16_to_cpu(dup->freetag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) == XFS_DIR2_DATA_FREE_TAG) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) length = be16_to_cpu(dup->length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) offset += length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) dep = bp->b_addr + offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) length = xfs_dir2_data_entsize(mp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) dep->namelen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) offset += length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) * Now set our real offset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) curoff =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) xfs_dir2_db_off_to_byte(geo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) xfs_dir2_byte_to_db(geo, curoff),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (offset >= geo->blksize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) * We have a pointer to an entry. Is it a live one?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) dup = bp->b_addr + offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) * No, it's unused, skip over it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) length = be16_to_cpu(dup->length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) offset += length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) curoff += length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) dep = bp->b_addr + offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) length = xfs_dir2_data_entsize(mp, dep->namelen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) filetype = xfs_dir2_data_get_ftype(mp, dep);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) ctx->pos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) if (XFS_IS_CORRUPT(dp->i_mount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) !xfs_dir2_namecheck(dep->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) dep->namelen))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) error = -EFSCORRUPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) if (!dir_emit(ctx, (char *)dep->name, dep->namelen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) be64_to_cpu(dep->inumber),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) xfs_dir3_get_dtype(dp->i_mount, filetype)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) * Advance to next entry in the block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) offset += length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) curoff += length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) /* bufsize may have just been a guess; don't go negative */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) bufsize = bufsize > length ? bufsize - length : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) * All done. Set output offset value to current offset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) if (curoff > xfs_dir2_dataptr_to_byte(XFS_DIR2_MAX_DATAPTR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) ctx->pos = XFS_DIR2_MAX_DATAPTR & 0x7fffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) ctx->pos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) if (bp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) xfs_trans_brelse(args->trans, bp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) * Read a directory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) * If supplied, the transaction collects locked dir buffers to avoid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) * nested buffer deadlocks. This function does not dirty the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) * transaction. The caller should ensure that the inode is locked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) * before calling this function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) xfs_readdir(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) struct xfs_trans *tp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) struct xfs_inode *dp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) struct dir_context *ctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) size_t bufsize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) struct xfs_da_args args = { NULL };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) int rval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) int v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) trace_xfs_readdir(dp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) if (XFS_FORCED_SHUTDOWN(dp->i_mount))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) ASSERT(S_ISDIR(VFS_I(dp)->i_mode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) XFS_STATS_INC(dp->i_mount, xs_dir_getdents);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) args.dp = dp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) args.geo = dp->i_mount->m_dir_geo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) args.trans = tp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) rval = xfs_dir2_sf_getdents(&args, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) else if ((rval = xfs_dir2_isblock(&args, &v)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) else if (v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) rval = xfs_dir2_block_getdents(&args, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) rval = xfs_dir2_leaf_getdents(&args, ctx, bufsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) return rval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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