diff options
Diffstat (limited to 'libblkid/src/superblocks/exfs.c')
| -rw-r--r-- | libblkid/src/superblocks/exfs.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/libblkid/src/superblocks/exfs.c b/libblkid/src/superblocks/exfs.c new file mode 100644 index 0000000..e0eafaf --- /dev/null +++ b/libblkid/src/superblocks/exfs.c @@ -0,0 +1,191 @@ +/* + * Copyright (C) 1999 by Andries Brouwer + * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o + * Copyright (C) 2001 by Andreas Dilger + * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> + * Copyright (C) 2008 Karel Zak <kzak@redhat.com> + * Copyright (C) 2013 Eric Sandeen <sandeen@redhat.com> + * Copyright (C) 2017 Hewlett Packard Enterprise Development LP + * + * This file may be redistributed under the terms of the + * GNU Lesser General Public License. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> +#include <errno.h> +#include <ctype.h> +#include <stdint.h> + +#include "superblocks.h" + +struct exfs_super_block { + uint32_t sb_magicnum; /* magic number == EXFS_SB_MAGIC */ + uint32_t sb_blocksize; /* logical block size, bytes */ + uint64_t sb_dblocks; /* number of data blocks */ + uint64_t sb_rblocks; /* number of realtime blocks */ + uint64_t sb_rextents; /* number of realtime extents */ + unsigned char sb_uuid[16]; /* file system unique id */ + uint64_t sb_logstart; /* starting block of log if internal */ + uint64_t sb_rootino; /* root inode number */ + uint64_t sb_rbmino; /* bitmap inode for realtime extents */ + uint64_t sb_rsumino; /* summary inode for rt bitmap */ + uint32_t sb_rextsize; /* realtime extent size, blocks */ + uint32_t sb_agblocks; /* size of an allocation group */ + uint32_t sb_agcount; /* number of allocation groups */ + uint32_t sb_rbmblocks; /* number of rt bitmap blocks */ + uint32_t sb_logblocks; /* number of log blocks */ + + uint16_t sb_versionnum; /* header version == EXFS_SB_VERSION */ + uint16_t sb_sectsize; /* volume sector size, bytes */ + uint16_t sb_inodesize; /* inode size, bytes */ + uint16_t sb_inopblock; /* inodes per block */ + char sb_fname[12]; /* file system name */ + uint8_t sb_blocklog; /* log2 of sb_blocksize */ + uint8_t sb_sectlog; /* log2 of sb_sectsize */ + uint8_t sb_inodelog; /* log2 of sb_inodesize */ + uint8_t sb_inopblog; /* log2 of sb_inopblock */ + uint8_t sb_agblklog; /* log2 of sb_agblocks (rounded up) */ + uint8_t sb_rextslog; /* log2 of sb_rextents */ + uint8_t sb_inprogress; /* mkfs is in progress, don't mount */ + uint8_t sb_imax_pct; /* max % of fs for inode space */ + /* statistics */ + uint64_t sb_icount; /* allocated inodes */ + uint64_t sb_ifree; /* free inodes */ + uint64_t sb_fdblocks; /* free data blocks */ + uint64_t sb_frextents; /* free realtime extents */ + + /* this is not all... but enough for libblkid */ + +} __attribute__((packed)); + +#define EXFS_MIN_BLOCKSIZE_LOG 9 /* i.e. 512 bytes */ +#define EXFS_MAX_BLOCKSIZE_LOG 16 /* i.e. 65536 bytes */ +#define EXFS_MIN_BLOCKSIZE (1 << EXFS_MIN_BLOCKSIZE_LOG) +#define EXFS_MAX_BLOCKSIZE (1 << EXFS_MAX_BLOCKSIZE_LOG) +#define EXFS_MIN_SECTORSIZE_LOG 9 /* i.e. 512 bytes */ +#define EXFS_MAX_SECTORSIZE_LOG 15 /* i.e. 32768 bytes */ +#define EXFS_MIN_SECTORSIZE (1 << EXFS_MIN_SECTORSIZE_LOG) +#define EXFS_MAX_SECTORSIZE (1 << EXFS_MAX_SECTORSIZE_LOG) + +#define EXFS_DINODE_MIN_LOG 8 +#define EXFS_DINODE_MAX_LOG 11 +#define EXFS_DINODE_MIN_SIZE (1 << EXFS_DINODE_MIN_LOG) +#define EXFS_DINODE_MAX_SIZE (1 << EXFS_DINODE_MAX_LOG) + +#define EXFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */ +#define EXFS_DFL_RTEXTSIZE (64 * 1024) /* 64kB */ +#define EXFS_MIN_RTEXTSIZE (4 * 1024) /* 4kB */ + +#define EXFS_MIN_AG_BLOCKS 64 +#define EXFS_MAX_DBLOCKS(s) ((uint64_t)(s)->sb_agcount * (s)->sb_agblocks) +#define EXFS_MIN_DBLOCKS(s) ((uint64_t)((s)->sb_agcount - 1) * \ + (s)->sb_agblocks + EXFS_MIN_AG_BLOCKS) + + +static void sb_from_disk(struct exfs_super_block *from, + struct exfs_super_block *to) +{ + + to->sb_magicnum = be32_to_cpu(from->sb_magicnum); + to->sb_blocksize = be32_to_cpu(from->sb_blocksize); + to->sb_dblocks = be64_to_cpu(from->sb_dblocks); + to->sb_rblocks = be64_to_cpu(from->sb_rblocks); + to->sb_rextents = be64_to_cpu(from->sb_rextents); + to->sb_logstart = be64_to_cpu(from->sb_logstart); + to->sb_rootino = be64_to_cpu(from->sb_rootino); + to->sb_rbmino = be64_to_cpu(from->sb_rbmino); + to->sb_rsumino = be64_to_cpu(from->sb_rsumino); + to->sb_rextsize = be32_to_cpu(from->sb_rextsize); + to->sb_agblocks = be32_to_cpu(from->sb_agblocks); + to->sb_agcount = be32_to_cpu(from->sb_agcount); + to->sb_rbmblocks = be32_to_cpu(from->sb_rbmblocks); + to->sb_logblocks = be32_to_cpu(from->sb_logblocks); + to->sb_versionnum = be16_to_cpu(from->sb_versionnum); + to->sb_sectsize = be16_to_cpu(from->sb_sectsize); + to->sb_inodesize = be16_to_cpu(from->sb_inodesize); + to->sb_inopblock = be16_to_cpu(from->sb_inopblock); + to->sb_blocklog = from->sb_blocklog; + to->sb_sectlog = from->sb_sectlog; + to->sb_inodelog = from->sb_inodelog; + to->sb_inopblog = from->sb_inopblog; + to->sb_agblklog = from->sb_agblklog; + to->sb_rextslog = from->sb_rextslog; + to->sb_inprogress = from->sb_inprogress; + to->sb_imax_pct = from->sb_imax_pct; + to->sb_icount = be64_to_cpu(from->sb_icount); + to->sb_ifree = be64_to_cpu(from->sb_ifree); + to->sb_fdblocks = be64_to_cpu(from->sb_fdblocks); + to->sb_frextents = be64_to_cpu(from->sb_frextents); +} + +static int exfs_verify_sb(struct exfs_super_block *ondisk) +{ + struct exfs_super_block sb, *sbp = &sb; + + /* beXX_to_cpu(), but don't convert UUID and fsname! */ + sb_from_disk(ondisk, sbp); + + /* sanity checks, we don't want to rely on magic string only */ + if (sbp->sb_agcount <= 0 || + sbp->sb_sectsize < EXFS_MIN_SECTORSIZE || + sbp->sb_sectsize > EXFS_MAX_SECTORSIZE || + sbp->sb_sectlog < EXFS_MIN_SECTORSIZE_LOG || + sbp->sb_sectlog > EXFS_MAX_SECTORSIZE_LOG || + sbp->sb_sectsize != (1 << sbp->sb_sectlog) || + sbp->sb_blocksize < EXFS_MIN_BLOCKSIZE || + sbp->sb_blocksize > EXFS_MAX_BLOCKSIZE || + sbp->sb_blocklog < EXFS_MIN_BLOCKSIZE_LOG || + sbp->sb_blocklog > EXFS_MAX_BLOCKSIZE_LOG || + sbp->sb_blocksize != (1ULL << sbp->sb_blocklog) || + sbp->sb_inodesize < EXFS_DINODE_MIN_SIZE || + sbp->sb_inodesize > EXFS_DINODE_MAX_SIZE || + sbp->sb_inodelog < EXFS_DINODE_MIN_LOG || + sbp->sb_inodelog > EXFS_DINODE_MAX_LOG || + sbp->sb_inodesize != (1 << sbp->sb_inodelog) || + (sbp->sb_blocklog - sbp->sb_inodelog != sbp->sb_inopblog) || + (sbp->sb_rextsize * sbp->sb_blocksize > EXFS_MAX_RTEXTSIZE) || + (sbp->sb_rextsize * sbp->sb_blocksize < EXFS_MIN_RTEXTSIZE) || + (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) || + sbp->sb_dblocks == 0 || + sbp->sb_dblocks > EXFS_MAX_DBLOCKS(sbp) || + sbp->sb_dblocks < EXFS_MIN_DBLOCKS(sbp)) + return 0; + return 1; +} + +static int probe_exfs(blkid_probe pr, const struct blkid_idmag *mag) +{ + struct exfs_super_block *xs; + + xs = blkid_probe_get_sb(pr, mag, struct exfs_super_block); + if (!xs) + return errno ? -errno : 1; + + if (!exfs_verify_sb(xs)) + return 1; + + if (*xs->sb_fname != '\0') + blkid_probe_set_label(pr, (unsigned char *) xs->sb_fname, + sizeof(xs->sb_fname)); + + blkid_probe_set_uuid(pr, xs->sb_uuid); + + blkid_probe_set_block_size(pr, be32_to_cpu(xs->sb_blocksize)); + + return 0; +} + +const struct blkid_idinfo exfs_idinfo = +{ + .name = "exfs", + .usage = BLKID_USAGE_FILESYSTEM, + .probefunc = probe_exfs, + .magics = + { + { .magic = "EXFS", .len = 4 }, + { NULL } + } +}; |