diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/xfs/xfs_mount.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/xfs/xfs_mount.c | 2567 |
1 files changed, 0 insertions, 2567 deletions
diff --git a/ANDROID_3.4.5/fs/xfs/xfs_mount.c b/ANDROID_3.4.5/fs/xfs/xfs_mount.c deleted file mode 100644 index 1ffead4b..00000000 --- a/ANDROID_3.4.5/fs/xfs/xfs_mount.c +++ /dev/null @@ -1,2567 +0,0 @@ -/* - * Copyright (c) 2000-2005 Silicon Graphics, Inc. - * All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it would be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ -#include "xfs.h" -#include "xfs_fs.h" -#include "xfs_types.h" -#include "xfs_bit.h" -#include "xfs_log.h" -#include "xfs_inum.h" -#include "xfs_trans.h" -#include "xfs_sb.h" -#include "xfs_ag.h" -#include "xfs_dir2.h" -#include "xfs_mount.h" -#include "xfs_bmap_btree.h" -#include "xfs_alloc_btree.h" -#include "xfs_ialloc_btree.h" -#include "xfs_dinode.h" -#include "xfs_inode.h" -#include "xfs_btree.h" -#include "xfs_ialloc.h" -#include "xfs_alloc.h" -#include "xfs_rtalloc.h" -#include "xfs_bmap.h" -#include "xfs_error.h" -#include "xfs_rw.h" -#include "xfs_quota.h" -#include "xfs_fsops.h" -#include "xfs_utils.h" -#include "xfs_trace.h" - - -#ifdef HAVE_PERCPU_SB -STATIC void xfs_icsb_balance_counter(xfs_mount_t *, xfs_sb_field_t, - int); -STATIC void xfs_icsb_balance_counter_locked(xfs_mount_t *, xfs_sb_field_t, - int); -STATIC void xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t); -#else - -#define xfs_icsb_balance_counter(mp, a, b) do { } while (0) -#define xfs_icsb_balance_counter_locked(mp, a, b) do { } while (0) -#endif - -static const struct { - short offset; - short type; /* 0 = integer - * 1 = binary / string (no translation) - */ -} xfs_sb_info[] = { - { offsetof(xfs_sb_t, sb_magicnum), 0 }, - { offsetof(xfs_sb_t, sb_blocksize), 0 }, - { offsetof(xfs_sb_t, sb_dblocks), 0 }, - { offsetof(xfs_sb_t, sb_rblocks), 0 }, - { offsetof(xfs_sb_t, sb_rextents), 0 }, - { offsetof(xfs_sb_t, sb_uuid), 1 }, - { offsetof(xfs_sb_t, sb_logstart), 0 }, - { offsetof(xfs_sb_t, sb_rootino), 0 }, - { offsetof(xfs_sb_t, sb_rbmino), 0 }, - { offsetof(xfs_sb_t, sb_rsumino), 0 }, - { offsetof(xfs_sb_t, sb_rextsize), 0 }, - { offsetof(xfs_sb_t, sb_agblocks), 0 }, - { offsetof(xfs_sb_t, sb_agcount), 0 }, - { offsetof(xfs_sb_t, sb_rbmblocks), 0 }, - { offsetof(xfs_sb_t, sb_logblocks), 0 }, - { offsetof(xfs_sb_t, sb_versionnum), 0 }, - { offsetof(xfs_sb_t, sb_sectsize), 0 }, - { offsetof(xfs_sb_t, sb_inodesize), 0 }, - { offsetof(xfs_sb_t, sb_inopblock), 0 }, - { offsetof(xfs_sb_t, sb_fname[0]), 1 }, - { offsetof(xfs_sb_t, sb_blocklog), 0 }, - { offsetof(xfs_sb_t, sb_sectlog), 0 }, - { offsetof(xfs_sb_t, sb_inodelog), 0 }, - { offsetof(xfs_sb_t, sb_inopblog), 0 }, - { offsetof(xfs_sb_t, sb_agblklog), 0 }, - { offsetof(xfs_sb_t, sb_rextslog), 0 }, - { offsetof(xfs_sb_t, sb_inprogress), 0 }, - { offsetof(xfs_sb_t, sb_imax_pct), 0 }, - { offsetof(xfs_sb_t, sb_icount), 0 }, - { offsetof(xfs_sb_t, sb_ifree), 0 }, - { offsetof(xfs_sb_t, sb_fdblocks), 0 }, - { offsetof(xfs_sb_t, sb_frextents), 0 }, - { offsetof(xfs_sb_t, sb_uquotino), 0 }, - { offsetof(xfs_sb_t, sb_gquotino), 0 }, - { offsetof(xfs_sb_t, sb_qflags), 0 }, - { offsetof(xfs_sb_t, sb_flags), 0 }, - { offsetof(xfs_sb_t, sb_shared_vn), 0 }, - { offsetof(xfs_sb_t, sb_inoalignmt), 0 }, - { offsetof(xfs_sb_t, sb_unit), 0 }, - { offsetof(xfs_sb_t, sb_width), 0 }, - { offsetof(xfs_sb_t, sb_dirblklog), 0 }, - { offsetof(xfs_sb_t, sb_logsectlog), 0 }, - { offsetof(xfs_sb_t, sb_logsectsize),0 }, - { offsetof(xfs_sb_t, sb_logsunit), 0 }, - { offsetof(xfs_sb_t, sb_features2), 0 }, - { offsetof(xfs_sb_t, sb_bad_features2), 0 }, - { sizeof(xfs_sb_t), 0 } -}; - -static DEFINE_MUTEX(xfs_uuid_table_mutex); -static int xfs_uuid_table_size; -static uuid_t *xfs_uuid_table; - -/* - * See if the UUID is unique among mounted XFS filesystems. - * Mount fails if UUID is nil or a FS with the same UUID is already mounted. - */ -STATIC int -xfs_uuid_mount( - struct xfs_mount *mp) -{ - uuid_t *uuid = &mp->m_sb.sb_uuid; - int hole, i; - - if (mp->m_flags & XFS_MOUNT_NOUUID) - return 0; - - if (uuid_is_nil(uuid)) { - xfs_warn(mp, "Filesystem has nil UUID - can't mount"); - return XFS_ERROR(EINVAL); - } - - mutex_lock(&xfs_uuid_table_mutex); - for (i = 0, hole = -1; i < xfs_uuid_table_size; i++) { - if (uuid_is_nil(&xfs_uuid_table[i])) { - hole = i; - continue; - } - if (uuid_equal(uuid, &xfs_uuid_table[i])) - goto out_duplicate; - } - - if (hole < 0) { - xfs_uuid_table = kmem_realloc(xfs_uuid_table, - (xfs_uuid_table_size + 1) * sizeof(*xfs_uuid_table), - xfs_uuid_table_size * sizeof(*xfs_uuid_table), - KM_SLEEP); - hole = xfs_uuid_table_size++; - } - xfs_uuid_table[hole] = *uuid; - mutex_unlock(&xfs_uuid_table_mutex); - - return 0; - - out_duplicate: - mutex_unlock(&xfs_uuid_table_mutex); - xfs_warn(mp, "Filesystem has duplicate UUID %pU - can't mount", uuid); - return XFS_ERROR(EINVAL); -} - -STATIC void -xfs_uuid_unmount( - struct xfs_mount *mp) -{ - uuid_t *uuid = &mp->m_sb.sb_uuid; - int i; - - if (mp->m_flags & XFS_MOUNT_NOUUID) - return; - - mutex_lock(&xfs_uuid_table_mutex); - for (i = 0; i < xfs_uuid_table_size; i++) { - if (uuid_is_nil(&xfs_uuid_table[i])) - continue; - if (!uuid_equal(uuid, &xfs_uuid_table[i])) - continue; - memset(&xfs_uuid_table[i], 0, sizeof(uuid_t)); - break; - } - ASSERT(i < xfs_uuid_table_size); - mutex_unlock(&xfs_uuid_table_mutex); -} - - -/* - * Reference counting access wrappers to the perag structures. - * Because we never free per-ag structures, the only thing we - * have to protect against changes is the tree structure itself. - */ -struct xfs_perag * -xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno) -{ - struct xfs_perag *pag; - int ref = 0; - - rcu_read_lock(); - pag = radix_tree_lookup(&mp->m_perag_tree, agno); - if (pag) { - ASSERT(atomic_read(&pag->pag_ref) >= 0); - ref = atomic_inc_return(&pag->pag_ref); - } - rcu_read_unlock(); - trace_xfs_perag_get(mp, agno, ref, _RET_IP_); - return pag; -} - -/* - * search from @first to find the next perag with the given tag set. - */ -struct xfs_perag * -xfs_perag_get_tag( - struct xfs_mount *mp, - xfs_agnumber_t first, - int tag) -{ - struct xfs_perag *pag; - int found; - int ref; - - rcu_read_lock(); - found = radix_tree_gang_lookup_tag(&mp->m_perag_tree, - (void **)&pag, first, 1, tag); - if (found <= 0) { - rcu_read_unlock(); - return NULL; - } - ref = atomic_inc_return(&pag->pag_ref); - rcu_read_unlock(); - trace_xfs_perag_get_tag(mp, pag->pag_agno, ref, _RET_IP_); - return pag; -} - -void -xfs_perag_put(struct xfs_perag *pag) -{ - int ref; - - ASSERT(atomic_read(&pag->pag_ref) > 0); - ref = atomic_dec_return(&pag->pag_ref); - trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_); -} - -STATIC void -__xfs_free_perag( - struct rcu_head *head) -{ - struct xfs_perag *pag = container_of(head, struct xfs_perag, rcu_head); - - ASSERT(atomic_read(&pag->pag_ref) == 0); - kmem_free(pag); -} - -/* - * Free up the per-ag resources associated with the mount structure. - */ -STATIC void -xfs_free_perag( - xfs_mount_t *mp) -{ - xfs_agnumber_t agno; - struct xfs_perag *pag; - - for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) { - spin_lock(&mp->m_perag_lock); - pag = radix_tree_delete(&mp->m_perag_tree, agno); - spin_unlock(&mp->m_perag_lock); - ASSERT(pag); - ASSERT(atomic_read(&pag->pag_ref) == 0); - call_rcu(&pag->rcu_head, __xfs_free_perag); - } -} - -/* - * Check size of device based on the (data/realtime) block count. - * Note: this check is used by the growfs code as well as mount. - */ -int -xfs_sb_validate_fsb_count( - xfs_sb_t *sbp, - __uint64_t nblocks) -{ - ASSERT(PAGE_SHIFT >= sbp->sb_blocklog); - ASSERT(sbp->sb_blocklog >= BBSHIFT); - -#if XFS_BIG_BLKNOS /* Limited by ULONG_MAX of page cache index */ - if (nblocks >> (PAGE_CACHE_SHIFT - sbp->sb_blocklog) > ULONG_MAX) - return EFBIG; -#else /* Limited by UINT_MAX of sectors */ - if (nblocks << (sbp->sb_blocklog - BBSHIFT) > UINT_MAX) - return EFBIG; -#endif - return 0; -} - -/* - * Check the validity of the SB found. - */ -STATIC int -xfs_mount_validate_sb( - xfs_mount_t *mp, - xfs_sb_t *sbp, - int flags) -{ - int loud = !(flags & XFS_MFSI_QUIET); - - /* - * If the log device and data device have the - * same device number, the log is internal. - * Consequently, the sb_logstart should be non-zero. If - * we have a zero sb_logstart in this case, we may be trying to mount - * a volume filesystem in a non-volume manner. - */ - if (sbp->sb_magicnum != XFS_SB_MAGIC) { - if (loud) - xfs_warn(mp, "bad magic number"); - return XFS_ERROR(EWRONGFS); - } - - if (!xfs_sb_good_version(sbp)) { - if (loud) - xfs_warn(mp, "bad version"); - return XFS_ERROR(EWRONGFS); - } - - if (unlikely( - sbp->sb_logstart == 0 && mp->m_logdev_targp == mp->m_ddev_targp)) { - if (loud) - xfs_warn(mp, - "filesystem is marked as having an external log; " - "specify logdev on the mount command line."); - return XFS_ERROR(EINVAL); - } - - if (unlikely( - sbp->sb_logstart != 0 && mp->m_logdev_targp != mp->m_ddev_targp)) { - if (loud) - xfs_warn(mp, - "filesystem is marked as having an internal log; " - "do not specify logdev on the mount command line."); - return XFS_ERROR(EINVAL); - } - - /* - * More sanity checking. Most of these were stolen directly from - * xfs_repair. - */ - if (unlikely( - sbp->sb_agcount <= 0 || - sbp->sb_sectsize < XFS_MIN_SECTORSIZE || - sbp->sb_sectsize > XFS_MAX_SECTORSIZE || - sbp->sb_sectlog < XFS_MIN_SECTORSIZE_LOG || - sbp->sb_sectlog > XFS_MAX_SECTORSIZE_LOG || - sbp->sb_sectsize != (1 << sbp->sb_sectlog) || - sbp->sb_blocksize < XFS_MIN_BLOCKSIZE || - sbp->sb_blocksize > XFS_MAX_BLOCKSIZE || - sbp->sb_blocklog < XFS_MIN_BLOCKSIZE_LOG || - sbp->sb_blocklog > XFS_MAX_BLOCKSIZE_LOG || - sbp->sb_blocksize != (1 << sbp->sb_blocklog) || - sbp->sb_inodesize < XFS_DINODE_MIN_SIZE || - sbp->sb_inodesize > XFS_DINODE_MAX_SIZE || - sbp->sb_inodelog < XFS_DINODE_MIN_LOG || - sbp->sb_inodelog > XFS_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 > XFS_MAX_RTEXTSIZE) || - (sbp->sb_rextsize * sbp->sb_blocksize < XFS_MIN_RTEXTSIZE) || - (sbp->sb_imax_pct > 100 /* zero sb_imax_pct is valid */) || - sbp->sb_dblocks == 0 || - sbp->sb_dblocks > XFS_MAX_DBLOCKS(sbp) || - sbp->sb_dblocks < XFS_MIN_DBLOCKS(sbp))) { - if (loud) - XFS_CORRUPTION_ERROR("SB sanity check failed", - XFS_ERRLEVEL_LOW, mp, sbp); - return XFS_ERROR(EFSCORRUPTED); - } - - /* - * Until this is fixed only page-sized or smaller data blocks work. - */ - if (unlikely(sbp->sb_blocksize > PAGE_SIZE)) { - if (loud) { - xfs_warn(mp, - "File system with blocksize %d bytes. " - "Only pagesize (%ld) or less will currently work.", - sbp->sb_blocksize, PAGE_SIZE); - } - return XFS_ERROR(ENOSYS); - } - - /* - * Currently only very few inode sizes are supported. - */ - switch (sbp->sb_inodesize) { - case 256: - case 512: - case 1024: - case 2048: - break; - default: - if (loud) - xfs_warn(mp, "inode size of %d bytes not supported", - sbp->sb_inodesize); - return XFS_ERROR(ENOSYS); - } - - if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) || - xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) { - if (loud) - xfs_warn(mp, - "file system too large to be mounted on this system."); - return XFS_ERROR(EFBIG); - } - - if (unlikely(sbp->sb_inprogress)) { - if (loud) - xfs_warn(mp, "file system busy"); - return XFS_ERROR(EFSCORRUPTED); - } - - /* - * Version 1 directory format has never worked on Linux. - */ - if (unlikely(!xfs_sb_version_hasdirv2(sbp))) { - if (loud) - xfs_warn(mp, - "file system using version 1 directory format"); - return XFS_ERROR(ENOSYS); - } - - return 0; -} - -int -xfs_initialize_perag( - xfs_mount_t *mp, - xfs_agnumber_t agcount, - xfs_agnumber_t *maxagi) -{ - xfs_agnumber_t index, max_metadata; - xfs_agnumber_t first_initialised = 0; - xfs_perag_t *pag; - xfs_agino_t agino; - xfs_ino_t ino; - xfs_sb_t *sbp = &mp->m_sb; - int error = -ENOMEM; - - /* - * Walk the current per-ag tree so we don't try to initialise AGs - * that already exist (growfs case). Allocate and insert all the - * AGs we don't find ready for initialisation. - */ - for (index = 0; index < agcount; index++) { - pag = xfs_perag_get(mp, index); - if (pag) { - xfs_perag_put(pag); - continue; - } - if (!first_initialised) - first_initialised = index; - - pag = kmem_zalloc(sizeof(*pag), KM_MAYFAIL); - if (!pag) - goto out_unwind; - pag->pag_agno = index; - pag->pag_mount = mp; - spin_lock_init(&pag->pag_ici_lock); - mutex_init(&pag->pag_ici_reclaim_lock); - INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC); - spin_lock_init(&pag->pag_buf_lock); - pag->pag_buf_tree = RB_ROOT; - - if (radix_tree_preload(GFP_NOFS)) - goto out_unwind; - - spin_lock(&mp->m_perag_lock); - if (radix_tree_insert(&mp->m_perag_tree, index, pag)) { - BUG(); - spin_unlock(&mp->m_perag_lock); - radix_tree_preload_end(); - error = -EEXIST; - goto out_unwind; - } - spin_unlock(&mp->m_perag_lock); - radix_tree_preload_end(); - } - - /* - * If we mount with the inode64 option, or no inode overflows - * the legacy 32-bit address space clear the inode32 option. - */ - agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0); - ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino); - - if ((mp->m_flags & XFS_MOUNT_SMALL_INUMS) && ino > XFS_MAXINUMBER_32) - mp->m_flags |= XFS_MOUNT_32BITINODES; - else - mp->m_flags &= ~XFS_MOUNT_32BITINODES; - - if (mp->m_flags & XFS_MOUNT_32BITINODES) { - /* - * Calculate how much should be reserved for inodes to meet - * the max inode percentage. - */ - if (mp->m_maxicount) { - __uint64_t icount; - - icount = sbp->sb_dblocks * sbp->sb_imax_pct; - do_div(icount, 100); - icount += sbp->sb_agblocks - 1; - do_div(icount, sbp->sb_agblocks); - max_metadata = icount; - } else { - max_metadata = agcount; - } - - for (index = 0; index < agcount; index++) { - ino = XFS_AGINO_TO_INO(mp, index, agino); - if (ino > XFS_MAXINUMBER_32) { - index++; - break; - } - - pag = xfs_perag_get(mp, index); - pag->pagi_inodeok = 1; - if (index < max_metadata) - pag->pagf_metadata = 1; - xfs_perag_put(pag); - } - } else { - for (index = 0; index < agcount; index++) { - pag = xfs_perag_get(mp, index); - pag->pagi_inodeok = 1; - xfs_perag_put(pag); - } - } - - if (maxagi) - *maxagi = index; - return 0; - -out_unwind: - kmem_free(pag); - for (; index > first_initialised; index--) { - pag = radix_tree_delete(&mp->m_perag_tree, index); - kmem_free(pag); - } - return error; -} - -void -xfs_sb_from_disk( - struct xfs_mount *mp, - xfs_dsb_t *from) -{ - struct xfs_sb *to = &mp->m_sb; - - 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); - memcpy(&to->sb_uuid, &from->sb_uuid, sizeof(to->sb_uuid)); - 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); - memcpy(&to->sb_fname, &from->sb_fname, sizeof(to->sb_fname)); - 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); - to->sb_uquotino = be64_to_cpu(from->sb_uquotino); - to->sb_gquotino = be64_to_cpu(from->sb_gquotino); - to->sb_qflags = be16_to_cpu(from->sb_qflags); - to->sb_flags = from->sb_flags; - to->sb_shared_vn = from->sb_shared_vn; - to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt); - to->sb_unit = be32_to_cpu(from->sb_unit); - to->sb_width = be32_to_cpu(from->sb_width); - to->sb_dirblklog = from->sb_dirblklog; - to->sb_logsectlog = from->sb_logsectlog; - to->sb_logsectsize = be16_to_cpu(from->sb_logsectsize); - to->sb_logsunit = be32_to_cpu(from->sb_logsunit); - to->sb_features2 = be32_to_cpu(from->sb_features2); - to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2); -} - -/* - * Copy in core superblock to ondisk one. - * - * The fields argument is mask of superblock fields to copy. - */ -void -xfs_sb_to_disk( - xfs_dsb_t *to, - xfs_sb_t *from, - __int64_t fields) -{ - xfs_caddr_t to_ptr = (xfs_caddr_t)to; - xfs_caddr_t from_ptr = (xfs_caddr_t)from; - xfs_sb_field_t f; - int first; - int size; - - ASSERT(fields); - if (!fields) - return; - - while (fields) { - f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); - first = xfs_sb_info[f].offset; - size = xfs_sb_info[f + 1].offset - first; - - ASSERT(xfs_sb_info[f].type == 0 || xfs_sb_info[f].type == 1); - - if (size == 1 || xfs_sb_info[f].type == 1) { - memcpy(to_ptr + first, from_ptr + first, size); - } else { - switch (size) { - case 2: - *(__be16 *)(to_ptr + first) = - cpu_to_be16(*(__u16 *)(from_ptr + first)); - break; - case 4: - *(__be32 *)(to_ptr + first) = - cpu_to_be32(*(__u32 *)(from_ptr + first)); - break; - case 8: - *(__be64 *)(to_ptr + first) = - cpu_to_be64(*(__u64 *)(from_ptr + first)); - break; - default: - ASSERT(0); - } - } - - fields &= ~(1LL << f); - } -} - -/* - * xfs_readsb - * - * Does the initial read of the superblock. - */ -int -xfs_readsb(xfs_mount_t *mp, int flags) -{ - unsigned int sector_size; - xfs_buf_t *bp; - int error; - int loud = !(flags & XFS_MFSI_QUIET); - - ASSERT(mp->m_sb_bp == NULL); - ASSERT(mp->m_ddev_targp != NULL); - - /* - * Allocate a (locked) buffer to hold the superblock. - * This will be kept around at all times to optimize - * access to the superblock. - */ - sector_size = xfs_getsize_buftarg(mp->m_ddev_targp); - -reread: - bp = xfs_buf_read_uncached(mp, mp->m_ddev_targp, - XFS_SB_DADDR, sector_size, 0); - if (!bp) { - if (loud) - xfs_warn(mp, "SB buffer read failed"); - return EIO; - } - - /* - * Initialize the mount structure from the superblock. - * But first do some basic consistency checking. - */ - xfs_sb_from_disk(mp, XFS_BUF_TO_SBP(bp)); - error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags); - if (error) { - if (loud) - xfs_warn(mp, "SB validate failed"); - goto release_buf; - } - - /* - * We must be able to do sector-sized and sector-aligned IO. - */ - if (sector_size > mp->m_sb.sb_sectsize) { - if (loud) - xfs_warn(mp, "device supports %u byte sectors (not %u)", - sector_size, mp->m_sb.sb_sectsize); - error = ENOSYS; - goto release_buf; - } - - /* - * If device sector size is smaller than the superblock size, - * re-read the superblock so the buffer is correctly sized. - */ - if (sector_size < mp->m_sb.sb_sectsize) { - xfs_buf_relse(bp); - sector_size = mp->m_sb.sb_sectsize; - goto reread; - } - - /* Initialize per-cpu counters */ - xfs_icsb_reinit_counters(mp); - - mp->m_sb_bp = bp; - xfs_buf_unlock(bp); - return 0; - -release_buf: - xfs_buf_relse(bp); - return error; -} - - -/* - * xfs_mount_common - * - * Mount initialization code establishing various mount - * fields from the superblock associated with the given - * mount structure - */ -STATIC void -xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp) -{ - mp->m_agfrotor = mp->m_agirotor = 0; - spin_lock_init(&mp->m_agirotor_lock); - mp->m_maxagi = mp->m_sb.sb_agcount; - mp->m_blkbit_log = sbp->sb_blocklog + XFS_NBBYLOG; - mp->m_blkbb_log = sbp->sb_blocklog - BBSHIFT; - mp->m_sectbb_log = sbp->sb_sectlog - BBSHIFT; - mp->m_agno_log = xfs_highbit32(sbp->sb_agcount - 1) + 1; - mp->m_agino_log = sbp->sb_inopblog + sbp->sb_agblklog; - mp->m_blockmask = sbp->sb_blocksize - 1; - mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG; - mp->m_blockwmask = mp->m_blockwsize - 1; - - mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1); - mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0); - mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2; - mp->m_alloc_mnr[1] = mp->m_alloc_mxr[1] / 2; - - mp->m_inobt_mxr[0] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 1); - mp->m_inobt_mxr[1] = xfs_inobt_maxrecs(mp, sbp->sb_blocksize, 0); - mp->m_inobt_mnr[0] = mp->m_inobt_mxr[0] / 2; - mp->m_inobt_mnr[1] = mp->m_inobt_mxr[1] / 2; - - mp->m_bmap_dmxr[0] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 1); - mp->m_bmap_dmxr[1] = xfs_bmbt_maxrecs(mp, sbp->sb_blocksize, 0); - mp->m_bmap_dmnr[0] = mp->m_bmap_dmxr[0] / 2; - mp->m_bmap_dmnr[1] = mp->m_bmap_dmxr[1] / 2; - - mp->m_bsize = XFS_FSB_TO_BB(mp, 1); - mp->m_ialloc_inos = (int)MAX((__uint16_t)XFS_INODES_PER_CHUNK, - sbp->sb_inopblock); - mp->m_ialloc_blks = mp->m_ialloc_inos >> sbp->sb_inopblog; -} - -/* - * xfs_initialize_perag_data - * - * Read in each per-ag structure so we can count up the number of - * allocated inodes, free inodes and used filesystem blocks as this - * information is no longer persistent in the superblock. Once we have - * this information, write it into the in-core superblock structure. - */ -STATIC int -xfs_initialize_perag_data(xfs_mount_t *mp, xfs_agnumber_t agcount) -{ - xfs_agnumber_t index; - xfs_perag_t *pag; - xfs_sb_t *sbp = &mp->m_sb; - uint64_t ifree = 0; - uint64_t ialloc = 0; - uint64_t bfree = 0; - uint64_t bfreelst = 0; - uint64_t btree = 0; - int error; - - for (index = 0; index < agcount; index++) { - /* - * read the agf, then the agi. This gets us - * all the information we need and populates the - * per-ag structures for us. - */ - error = xfs_alloc_pagf_init(mp, NULL, index, 0); - if (error) - return error; - - error = xfs_ialloc_pagi_init(mp, NULL, index); - if (error) - return error; - pag = xfs_perag_get(mp, index); - ifree += pag->pagi_freecount; - ialloc += pag->pagi_count; - bfree += pag->pagf_freeblks; - bfreelst += pag->pagf_flcount; - btree += pag->pagf_btreeblks; - xfs_perag_put(pag); - } - /* - * Overwrite incore superblock counters with just-read data - */ - spin_lock(&mp->m_sb_lock); - sbp->sb_ifree = ifree; - sbp->sb_icount = ialloc; - sbp->sb_fdblocks = bfree + bfreelst + btree; - spin_unlock(&mp->m_sb_lock); - - /* Fixup the per-cpu counters as well. */ - xfs_icsb_reinit_counters(mp); - - return 0; -} - -/* - * Update alignment values based on mount options and sb values - */ -STATIC int -xfs_update_alignment(xfs_mount_t *mp) -{ - xfs_sb_t *sbp = &(mp->m_sb); - - if (mp->m_dalign) { - /* - * If stripe unit and stripe width are not multiples - * of the fs blocksize turn off alignment. - */ - if ((BBTOB(mp->m_dalign) & mp->m_blockmask) || - (BBTOB(mp->m_swidth) & mp->m_blockmask)) { - if (mp->m_flags & XFS_MOUNT_RETERR) { - xfs_warn(mp, "alignment check failed: " - "(sunit/swidth vs. blocksize)"); - return XFS_ERROR(EINVAL); - } - mp->m_dalign = mp->m_swidth = 0; - } else { - /* - * Convert the stripe unit and width to FSBs. - */ - mp->m_dalign = XFS_BB_TO_FSBT(mp, mp->m_dalign); - if (mp->m_dalign && (sbp->sb_agblocks % mp->m_dalign)) { - if (mp->m_flags & XFS_MOUNT_RETERR) { - xfs_warn(mp, "alignment check failed: " - "(sunit/swidth vs. ag size)"); - return XFS_ERROR(EINVAL); - } - xfs_warn(mp, - "stripe alignment turned off: sunit(%d)/swidth(%d) " - "incompatible with agsize(%d)", - mp->m_dalign, mp->m_swidth, - sbp->sb_agblocks); - - mp->m_dalign = 0; - mp->m_swidth = 0; - } else if (mp->m_dalign) { - mp->m_swidth = XFS_BB_TO_FSBT(mp, mp->m_swidth); - } else { - if (mp->m_flags & XFS_MOUNT_RETERR) { - xfs_warn(mp, "alignment check failed: " - "sunit(%d) less than bsize(%d)", - mp->m_dalign, - mp->m_blockmask +1); - return XFS_ERROR(EINVAL); - } - mp->m_swidth = 0; - } - } - - /* - * Update superblock with new values - * and log changes - */ - if (xfs_sb_version_hasdalign(sbp)) { - if (sbp->sb_unit != mp->m_dalign) { - sbp->sb_unit = mp->m_dalign; - mp->m_update_flags |= XFS_SB_UNIT; - } - if (sbp->sb_width != mp->m_swidth) { - sbp->sb_width = mp->m_swidth; - mp->m_update_flags |= XFS_SB_WIDTH; - } - } - } else if ((mp->m_flags & XFS_MOUNT_NOALIGN) != XFS_MOUNT_NOALIGN && - xfs_sb_version_hasdalign(&mp->m_sb)) { - mp->m_dalign = sbp->sb_unit; - mp->m_swidth = sbp->sb_width; - } - - return 0; -} - -/* - * Set the maximum inode count for this filesystem - */ -STATIC void -xfs_set_maxicount(xfs_mount_t *mp) -{ - xfs_sb_t *sbp = &(mp->m_sb); - __uint64_t icount; - - if (sbp->sb_imax_pct) { - /* - * Make sure the maximum inode count is a multiple - * of the units we allocate inodes in. - */ - icount = sbp->sb_dblocks * sbp->sb_imax_pct; - do_div(icount, 100); - do_div(icount, mp->m_ialloc_blks); - mp->m_maxicount = (icount * mp->m_ialloc_blks) << - sbp->sb_inopblog; - } else { - mp->m_maxicount = 0; - } -} - -/* - * Set the default minimum read and write sizes unless - * already specified in a mount option. - * We use smaller I/O sizes when the file system - * is being used for NFS service (wsync mount option). - */ -STATIC void -xfs_set_rw_sizes(xfs_mount_t *mp) -{ - xfs_sb_t *sbp = &(mp->m_sb); - int readio_log, writeio_log; - - if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { - if (mp->m_flags & XFS_MOUNT_WSYNC) { - readio_log = XFS_WSYNC_READIO_LOG; - writeio_log = XFS_WSYNC_WRITEIO_LOG; - } else { - readio_log = XFS_READIO_LOG_LARGE; - writeio_log = XFS_WRITEIO_LOG_LARGE; - } - } else { - readio_log = mp->m_readio_log; - writeio_log = mp->m_writeio_log; - } - - if (sbp->sb_blocklog > readio_log) { - mp->m_readio_log = sbp->sb_blocklog; - } else { - mp->m_readio_log = readio_log; - } - mp->m_readio_blocks = 1 << (mp->m_readio_log - sbp->sb_blocklog); - if (sbp->sb_blocklog > writeio_log) { - mp->m_writeio_log = sbp->sb_blocklog; - } else { - mp->m_writeio_log = writeio_log; - } - mp->m_writeio_blocks = 1 << (mp->m_writeio_log - sbp->sb_blocklog); -} - -/* - * precalculate the low space thresholds for dynamic speculative preallocation. - */ -void -xfs_set_low_space_thresholds( - struct xfs_mount *mp) -{ - int i; - - for (i = 0; i < XFS_LOWSP_MAX; i++) { - __uint64_t space = mp->m_sb.sb_dblocks; - - do_div(space, 100); - mp->m_low_space[i] = space * (i + 1); - } -} - - -/* - * Set whether we're using inode alignment. - */ -STATIC void -xfs_set_inoalignment(xfs_mount_t *mp) -{ - if (xfs_sb_version_hasalign(&mp->m_sb) && - mp->m_sb.sb_inoalignmt >= - XFS_B_TO_FSBT(mp, mp->m_inode_cluster_size)) - mp->m_inoalign_mask = mp->m_sb.sb_inoalignmt - 1; - else - mp->m_inoalign_mask = 0; - /* - * If we are using stripe alignment, check whether - * the stripe unit is a multiple of the inode alignment - */ - if (mp->m_dalign && mp->m_inoalign_mask && - !(mp->m_dalign & mp->m_inoalign_mask)) - mp->m_sinoalign = mp->m_dalign; - else - mp->m_sinoalign = 0; -} - -/* - * Check that the data (and log if separate) are an ok size. - */ -STATIC int -xfs_check_sizes(xfs_mount_t *mp) -{ - xfs_buf_t *bp; - xfs_daddr_t d; - - d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks); - if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) { - xfs_warn(mp, "filesystem size mismatch detected"); - return XFS_ERROR(EFBIG); - } - bp = xfs_buf_read_uncached(mp, mp->m_ddev_targp, - d - XFS_FSS_TO_BB(mp, 1), - BBTOB(XFS_FSS_TO_BB(mp, 1)), 0); - if (!bp) { - xfs_warn(mp, "last sector read failed"); - return EIO; - } - xfs_buf_relse(bp); - - if (mp->m_logdev_targp != mp->m_ddev_targp) { - d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks); - if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) { - xfs_warn(mp, "log size mismatch detected"); - return XFS_ERROR(EFBIG); - } - bp = xfs_buf_read_uncached(mp, mp->m_logdev_targp, - d - XFS_FSB_TO_BB(mp, 1), - XFS_FSB_TO_B(mp, 1), 0); - if (!bp) { - xfs_warn(mp, "log device read failed"); - return EIO; - } - xfs_buf_relse(bp); - } - return 0; -} - -/* - * Clear the quotaflags in memory and in the superblock. - */ -int -xfs_mount_reset_sbqflags( - struct xfs_mount *mp) -{ - int error; - struct xfs_trans *tp; - - mp->m_qflags = 0; - - /* - * It is OK to look at sb_qflags here in mount path, - * without m_sb_lock. - */ - if (mp->m_sb.sb_qflags == 0) - return 0; - spin_lock(&mp->m_sb_lock); - mp->m_sb.sb_qflags = 0; - spin_unlock(&mp->m_sb_lock); - - /* - * If the fs is readonly, let the incore superblock run - * with quotas off but don't flush the update out to disk - */ - if (mp->m_flags & XFS_MOUNT_RDONLY) - return 0; - - tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE); - error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, - XFS_DEFAULT_LOG_COUNT); - if (error) { - xfs_trans_cancel(tp, 0); - xfs_alert(mp, "%s: Superblock update failed!", __func__); - return error; - } - - xfs_mod_sb(tp, XFS_SB_QFLAGS); - return xfs_trans_commit(tp, 0); -} - -__uint64_t -xfs_default_resblks(xfs_mount_t *mp) -{ - __uint64_t resblks; - - /* - * We default to 5% or 8192 fsbs of space reserved, whichever is - * smaller. This is intended to cover concurrent allocation - * transactions when we initially hit enospc. These each require a 4 - * block reservation. Hence by default we cover roughly 2000 concurrent - * allocation reservations. - */ - resblks = mp->m_sb.sb_dblocks; - do_div(resblks, 20); - resblks = min_t(__uint64_t, resblks, 8192); - return resblks; -} - -/* - * This function does the following on an initial mount of a file system: - * - reads the superblock from disk and init the mount struct - * - if we're a 32-bit kernel, do a size check on the superblock - * so we don't mount terabyte filesystems - * - init mount struct realtime fields - * - allocate inode hash table for fs - * - init directory manager - * - perform recovery and init the log manager - */ -int -xfs_mountfs( - xfs_mount_t *mp) -{ - xfs_sb_t *sbp = &(mp->m_sb); - xfs_inode_t *rip; - __uint64_t resblks; - uint quotamount = 0; - uint quotaflags = 0; - int error = 0; - - xfs_mount_common(mp, sbp); - - /* - * Check for a mismatched features2 values. Older kernels - * read & wrote into the wrong sb offset for sb_features2 - * on some platforms due to xfs_sb_t not being 64bit size aligned - * when sb_features2 was added, which made older superblock - * reading/writing routines swap it as a 64-bit value. - * - * For backwards compatibility, we make both slots equal. - * - * If we detect a mismatched field, we OR the set bits into the - * existing features2 field in case it has already been modified; we - * don't want to lose any features. We then update the bad location - * with the ORed value so that older kernels will see any features2 - * flags, and mark the two fields as needing updates once the - * transaction subsystem is online. - */ - if (xfs_sb_has_mismatched_features2(sbp)) { - xfs_warn(mp, "correcting sb_features alignment problem"); - sbp->sb_features2 |= sbp->sb_bad_features2; - sbp->sb_bad_features2 = sbp->sb_features2; - mp->m_update_flags |= XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2; - - /* - * Re-check for ATTR2 in case it was found in bad_features2 - * slot. - */ - if (xfs_sb_version_hasattr2(&mp->m_sb) && - !(mp->m_flags & XFS_MOUNT_NOATTR2)) - mp->m_flags |= XFS_MOUNT_ATTR2; - } - - if (xfs_sb_version_hasattr2(&mp->m_sb) && - (mp->m_flags & XFS_MOUNT_NOATTR2)) { - xfs_sb_version_removeattr2(&mp->m_sb); - mp->m_update_flags |= XFS_SB_FEATURES2; - - /* update sb_versionnum for the clearing of the morebits */ - if (!sbp->sb_features2) - mp->m_update_flags |= XFS_SB_VERSIONNUM; - } - - /* - * Check if sb_agblocks is aligned at stripe boundary - * If sb_agblocks is NOT aligned turn off m_dalign since - * allocator alignment is within an ag, therefore ag has - * to be aligned at stripe boundary. - */ - error = xfs_update_alignment(mp); - if (error) - goto out; - - xfs_alloc_compute_maxlevels(mp); - xfs_bmap_compute_maxlevels(mp, XFS_DATA_FORK); - xfs_bmap_compute_maxlevels(mp, XFS_ATTR_FORK); - xfs_ialloc_compute_maxlevels(mp); - - xfs_set_maxicount(mp); - - mp->m_maxioffset = xfs_max_file_offset(sbp->sb_blocklog); - - error = xfs_uuid_mount(mp); - if (error) - goto out; - - /* - * Set the minimum read and write sizes - */ - xfs_set_rw_sizes(mp); - - /* set the low space thresholds for dynamic preallocation */ - xfs_set_low_space_thresholds(mp); - - /* - * Set the inode cluster size. - * This may still be overridden by the file system - * block size if it is larger than the chosen cluster size. - */ - mp->m_inode_cluster_size = XFS_INODE_BIG_CLUSTER_SIZE; - - /* - * Set inode alignment fields - */ - xfs_set_inoalignment(mp); - - /* - * Check that the data (and log if separate) are an ok size. - */ - error = xfs_check_sizes(mp); - if (error) - goto out_remove_uuid; - - /* - * Initialize realtime fields in the mount structure - */ - error = xfs_rtmount_init(mp); - if (error) { - xfs_warn(mp, "RT mount failed"); - goto out_remove_uuid; - } - - /* - * Copies the low order bits of the timestamp and the randomly - * set "sequence" number out of a UUID. - */ - uuid_getnodeuniq(&sbp->sb_uuid, mp->m_fixedfsid); - - mp->m_dmevmask = 0; /* not persistent; set after each mount */ - - xfs_dir_mount(mp); - - /* - * Initialize the attribute manager's entries. - */ - mp->m_attr_magicpct = (mp->m_sb.sb_blocksize * 37) / 100; - - /* - * Initialize the precomputed transaction reservations values. - */ - xfs_trans_init(mp); - - /* - * Allocate and initialize the per-ag data. - */ - spin_lock_init(&mp->m_perag_lock); - INIT_RADIX_TREE(&mp->m_perag_tree, GFP_ATOMIC); - error = xfs_initialize_perag(mp, sbp->sb_agcount, &mp->m_maxagi); - if (error) { - xfs_warn(mp, "Failed per-ag init: %d", error); - goto out_remove_uuid; - } - - if (!sbp->sb_logblocks) { - xfs_warn(mp, "no log defined"); - XFS_ERROR_REPORT("xfs_mountfs", XFS_ERRLEVEL_LOW, mp); - error = XFS_ERROR(EFSCORRUPTED); - goto out_free_perag; - } - - /* - * log's mount-time initialization. Perform 1st part recovery if needed - */ - error = xfs_log_mount(mp, mp->m_logdev_targp, - XFS_FSB_TO_DADDR(mp, sbp->sb_logstart), - XFS_FSB_TO_BB(mp, sbp->sb_logblocks)); - if (error) { - xfs_warn(mp, "log mount failed"); - goto out_free_perag; - } - - /* - * Now the log is mounted, we know if it was an unclean shutdown or - * not. If it was, with the first phase of recovery has completed, we - * have consistent AG blocks on disk. We have not recovered EFIs yet, - * but they are recovered transactionally in the second recovery phase - * later. - * - * Hence we can safely re-initialise incore superblock counters from - * the per-ag data. These may not be correct if the filesystem was not - * cleanly unmounted, so we need to wait for recovery to finish before - * doing this. - * - * If the filesystem was cleanly unmounted, then we can trust the - * values in the superblock to be correct and we don't need to do - * anything here. - * - * If we are currently making the filesystem, the initialisation will - * fail as the perag data is in an undefined state. - */ - if (xfs_sb_version_haslazysbcount(&mp->m_sb) && - !XFS_LAST_UNMOUNT_WAS_CLEAN(mp) && - !mp->m_sb.sb_inprogress) { - error = xfs_initialize_perag_data(mp, sbp->sb_agcount); - if (error) - goto out_free_perag; - } - - /* - * Get and sanity-check the root inode. - * Save the pointer to it in the mount structure. - */ - error = xfs_iget(mp, NULL, sbp->sb_rootino, 0, XFS_ILOCK_EXCL, &rip); - if (error) { - xfs_warn(mp, "failed to read root inode"); - goto out_log_dealloc; - } - - ASSERT(rip != NULL); - - if (unlikely(!S_ISDIR(rip->i_d.di_mode))) { - xfs_warn(mp, "corrupted root inode %llu: not a directory", - (unsigned long long)rip->i_ino); - xfs_iunlock(rip, XFS_ILOCK_EXCL); - XFS_ERROR_REPORT("xfs_mountfs_int(2)", XFS_ERRLEVEL_LOW, - mp); - error = XFS_ERROR(EFSCORRUPTED); - goto out_rele_rip; - } - mp->m_rootip = rip; /* save it */ - - xfs_iunlock(rip, XFS_ILOCK_EXCL); - - /* - * Initialize realtime inode pointers in the mount structure - */ - error = xfs_rtmount_inodes(mp); - if (error) { - /* - * Free up the root inode. - */ - xfs_warn(mp, "failed to read RT inodes"); - goto out_rele_rip; - } - - /* - * If this is a read-only mount defer the superblock updates until - * the next remount into writeable mode. Otherwise we would never - * perform the update e.g. for the root filesystem. - */ - if (mp->m_update_flags && !(mp->m_flags & XFS_MOUNT_RDONLY)) { - error = xfs_mount_log_sb(mp, mp->m_update_flags); - if (error) { - xfs_warn(mp, "failed to write sb changes"); - goto out_rtunmount; - } - } - - /* - * Initialise the XFS quota management subsystem for this mount - */ - if (XFS_IS_QUOTA_RUNNING(mp)) { - error = xfs_qm_newmount(mp, "amount, "aflags); - if (error) - goto out_rtunmount; - } else { - ASSERT(!XFS_IS_QUOTA_ON(mp)); - - /* - * If a file system had quotas running earlier, but decided to - * mount without -o uquota/pquota/gquota options, revoke the - * quotachecked license. - */ - if (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_ACCT) { - xfs_notice(mp, "resetting quota flags"); - error = xfs_mount_reset_sbqflags(mp); - if (error) - return error; - } - } - - /* - * Finish recovering the file system. This part needed to be - * delayed until after the root and real-time bitmap inodes - * were consistently read in. - */ - error = xfs_log_mount_finish(mp); - if (error) { - xfs_warn(mp, "log mount finish failed"); - goto out_rtunmount; - } - - /* - * Complete the quota initialisation, post-log-replay component. - */ - if (quotamount) { - ASSERT(mp->m_qflags == 0); - mp->m_qflags = quotaflags; - - xfs_qm_mount_quotas(mp); - } - - /* - * Now we are mounted, reserve a small amount of unused space for - * privileged transactions. This is needed so that transaction - * space required for critical operations can dip into this pool - * when at ENOSPC. This is needed for operations like create with - * attr, unwritten extent conversion at ENOSPC, etc. Data allocations - * are not allowed to use this reserved space. - * - * This may drive us straight to ENOSPC on mount, but that implies - * we were already there on the last unmount. Warn if this occurs. - */ - if (!(mp->m_flags & XFS_MOUNT_RDONLY)) { - resblks = xfs_default_resblks(mp); - error = xfs_reserve_blocks(mp, &resblks, NULL); - if (error) - xfs_warn(mp, - "Unable to allocate reserve blocks. Continuing without reserve pool."); - } - - return 0; - - out_rtunmount: - xfs_rtunmount_inodes(mp); - out_rele_rip: - IRELE(rip); - out_log_dealloc: - xfs_log_unmount(mp); - out_free_perag: - xfs_free_perag(mp); - out_remove_uuid: - xfs_uuid_unmount(mp); - out: - return error; -} - -/* - * This flushes out the inodes,dquots and the superblock, unmounts the - * log and makes sure that incore structures are freed. - */ -void -xfs_unmountfs( - struct xfs_mount *mp) -{ - __uint64_t resblks; - int error; - - xfs_qm_unmount_quotas(mp); - xfs_rtunmount_inodes(mp); - IRELE(mp->m_rootip); - - /* - * We can potentially deadlock here if we have an inode cluster - * that has been freed has its buffer still pinned in memory because - * the transaction is still sitting in a iclog. The stale inodes - * on that buffer will have their flush locks held until the - * transaction hits the disk and the callbacks run. the inode - * flush takes the flush lock unconditionally and with nothing to - * push out the iclog we will never get that unlocked. hence we - * need to force the log first. - */ - xfs_log_force(mp, XFS_LOG_SYNC); - - /* - * Do a delwri reclaim pass first so that as many dirty inodes are - * queued up for IO as possible. Then flush the buffers before making - * a synchronous path to catch all the remaining inodes are reclaimed. - * This makes the reclaim process as quick as possible by avoiding - * synchronous writeout and blocking on inodes already in the delwri - * state as much as possible. - */ - xfs_reclaim_inodes(mp, 0); - xfs_flush_buftarg(mp->m_ddev_targp, 1); - xfs_reclaim_inodes(mp, SYNC_WAIT); - - xfs_qm_unmount(mp); - - /* - * Flush out the log synchronously so that we know for sure - * that nothing is pinned. This is important because bflush() - * will skip pinned buffers. - */ - xfs_log_force(mp, XFS_LOG_SYNC); - - /* - * Unreserve any blocks we have so that when we unmount we don't account - * the reserved free space as used. This is really only necessary for - * lazy superblock counting because it trusts the incore superblock - * counters to be absolutely correct on clean unmount. - * - * We don't bother correcting this elsewhere for lazy superblock - * counting because on mount of an unclean filesystem we reconstruct the - * correct counter value and this is irrelevant. - * - * For non-lazy counter filesystems, this doesn't matter at all because - * we only every apply deltas to the superblock and hence the incore - * value does not matter.... - */ - resblks = 0; - error = xfs_reserve_blocks(mp, &resblks, NULL); - if (error) - xfs_warn(mp, "Unable to free reserved block pool. " - "Freespace may not be correct on next mount."); - - error = xfs_log_sbcount(mp); - if (error) - xfs_warn(mp, "Unable to update superblock counters. " - "Freespace may not be correct on next mount."); - xfs_unmountfs_writesb(mp); - - /* - * Make sure all buffers have been flushed and completed before - * unmounting the log. - */ - error = xfs_flush_buftarg(mp->m_ddev_targp, 1); - if (error) - xfs_warn(mp, "%d busy buffers during unmount.", error); - xfs_wait_buftarg(mp->m_ddev_targp); - - xfs_log_unmount_write(mp); - xfs_log_unmount(mp); - xfs_uuid_unmount(mp); - -#if defined(DEBUG) - xfs_errortag_clearall(mp, 0); -#endif - xfs_free_perag(mp); -} - -int -xfs_fs_writable(xfs_mount_t *mp) -{ - return !(xfs_test_for_freeze(mp) || XFS_FORCED_SHUTDOWN(mp) || - (mp->m_flags & XFS_MOUNT_RDONLY)); -} - -/* - * xfs_log_sbcount - * - * Sync the superblock counters to disk. - * - * Note this code can be called during the process of freezing, so - * we may need to use the transaction allocator which does not - * block when the transaction subsystem is in its frozen state. - */ -int -xfs_log_sbcount(xfs_mount_t *mp) -{ - xfs_trans_t *tp; - int error; - - if (!xfs_fs_writable(mp)) - return 0; - - xfs_icsb_sync_counters(mp, 0); - - /* - * we don't need to do this if we are updating the superblock - * counters on every modification. - */ - if (!xfs_sb_version_haslazysbcount(&mp->m_sb)) - return 0; - - tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_COUNT, KM_SLEEP); - error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, - XFS_DEFAULT_LOG_COUNT); - if (error) { - xfs_trans_cancel(tp, 0); - return error; - } - - xfs_mod_sb(tp, XFS_SB_IFREE | XFS_SB_ICOUNT | XFS_SB_FDBLOCKS); - xfs_trans_set_sync(tp); - error = xfs_trans_commit(tp, 0); - return error; -} - -int -xfs_unmountfs_writesb(xfs_mount_t *mp) -{ - xfs_buf_t *sbp; - int error = 0; - - /* - * skip superblock write if fs is read-only, or - * if we are doing a forced umount. - */ - if (!((mp->m_flags & XFS_MOUNT_RDONLY) || - XFS_FORCED_SHUTDOWN(mp))) { - - sbp = xfs_getsb(mp, 0); - - XFS_BUF_UNDONE(sbp); - XFS_BUF_UNREAD(sbp); - xfs_buf_delwri_dequeue(sbp); - XFS_BUF_WRITE(sbp); - XFS_BUF_UNASYNC(sbp); - ASSERT(sbp->b_target == mp->m_ddev_targp); - xfsbdstrat(mp, sbp); - error = xfs_buf_iowait(sbp); - if (error) - xfs_buf_ioerror_alert(sbp, __func__); - xfs_buf_relse(sbp); - } - return error; -} - -/* - * xfs_mod_sb() can be used to copy arbitrary changes to the - * in-core superblock into the superblock buffer to be logged. - * It does not provide the higher level of locking that is - * needed to protect the in-core superblock from concurrent - * access. - */ -void -xfs_mod_sb(xfs_trans_t *tp, __int64_t fields) -{ - xfs_buf_t *bp; - int first; - int last; - xfs_mount_t *mp; - xfs_sb_field_t f; - - ASSERT(fields); - if (!fields) - return; - mp = tp->t_mountp; - bp = xfs_trans_getsb(tp, mp, 0); - first = sizeof(xfs_sb_t); - last = 0; - - /* translate/copy */ - - xfs_sb_to_disk(XFS_BUF_TO_SBP(bp), &mp->m_sb, fields); - - /* find modified range */ - f = (xfs_sb_field_t)xfs_highbit64((__uint64_t)fields); - ASSERT((1LL << f) & XFS_SB_MOD_BITS); - last = xfs_sb_info[f + 1].offset - 1; - - f = (xfs_sb_field_t)xfs_lowbit64((__uint64_t)fields); - ASSERT((1LL << f) & XFS_SB_MOD_BITS); - first = xfs_sb_info[f].offset; - - xfs_trans_log_buf(tp, bp, first, last); -} - - -/* - * xfs_mod_incore_sb_unlocked() is a utility routine common used to apply - * a delta to a specified field in the in-core superblock. Simply - * switch on the field indicated and apply the delta to that field. - * Fields are not allowed to dip below zero, so if the delta would - * do this do not apply it and return EINVAL. - * - * The m_sb_lock must be held when this routine is called. - */ -STATIC int -xfs_mod_incore_sb_unlocked( - xfs_mount_t *mp, - xfs_sb_field_t field, - int64_t delta, - int rsvd) -{ - int scounter; /* short counter for 32 bit fields */ - long long lcounter; /* long counter for 64 bit fields */ - long long res_used, rem; - - /* - * With the in-core superblock spin lock held, switch - * on the indicated field. Apply the delta to the - * proper field. If the fields value would dip below - * 0, then do not apply the delta and return EINVAL. - */ - switch (field) { - case XFS_SBS_ICOUNT: - lcounter = (long long)mp->m_sb.sb_icount; - lcounter += delta; - if (lcounter < 0) { - ASSERT(0); - return XFS_ERROR(EINVAL); - } - mp->m_sb.sb_icount = lcounter; - return 0; - case XFS_SBS_IFREE: - lcounter = (long long)mp->m_sb.sb_ifree; - lcounter += delta; - if (lcounter < 0) { - ASSERT(0); - return XFS_ERROR(EINVAL); - } - mp->m_sb.sb_ifree = lcounter; - return 0; - case XFS_SBS_FDBLOCKS: - lcounter = (long long) - mp->m_sb.sb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); - res_used = (long long)(mp->m_resblks - mp->m_resblks_avail); - - if (delta > 0) { /* Putting blocks back */ - if (res_used > delta) { - mp->m_resblks_avail += delta; - } else { - rem = delta - res_used; - mp->m_resblks_avail = mp->m_resblks; - lcounter += rem; - } - } else { /* Taking blocks away */ - lcounter += delta; - if (lcounter >= 0) { - mp->m_sb.sb_fdblocks = lcounter + - XFS_ALLOC_SET_ASIDE(mp); - return 0; - } - - /* - * We are out of blocks, use any available reserved - * blocks if were allowed to. - */ - if (!rsvd) - return XFS_ERROR(ENOSPC); - - lcounter = (long long)mp->m_resblks_avail + delta; - if (lcounter >= 0) { - mp->m_resblks_avail = lcounter; - return 0; - } - printk_once(KERN_WARNING - "Filesystem \"%s\": reserve blocks depleted! " - "Consider increasing reserve pool size.", - mp->m_fsname); - return XFS_ERROR(ENOSPC); - } - - mp->m_sb.sb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); - return 0; - case XFS_SBS_FREXTENTS: - lcounter = (long long)mp->m_sb.sb_frextents; - lcounter += delta; - if (lcounter < 0) { - return XFS_ERROR(ENOSPC); - } - mp->m_sb.sb_frextents = lcounter; - return 0; - case XFS_SBS_DBLOCKS: - lcounter = (long long)mp->m_sb.sb_dblocks; - lcounter += delta; - if (lcounter < 0) { - ASSERT(0); - return XFS_ERROR(EINVAL); - } - mp->m_sb.sb_dblocks = lcounter; - return 0; - case XFS_SBS_AGCOUNT: - scounter = mp->m_sb.sb_agcount; - scounter += delta; - if (scounter < 0) { - ASSERT(0); - return XFS_ERROR(EINVAL); - } - mp->m_sb.sb_agcount = scounter; - return 0; - case XFS_SBS_IMAX_PCT: - scounter = mp->m_sb.sb_imax_pct; - scounter += delta; - if (scounter < 0) { - ASSERT(0); - return XFS_ERROR(EINVAL); - } - mp->m_sb.sb_imax_pct = scounter; - return 0; - case XFS_SBS_REXTSIZE: - scounter = mp->m_sb.sb_rextsize; - scounter += delta; - if (scounter < 0) { - ASSERT(0); - return XFS_ERROR(EINVAL); - } - mp->m_sb.sb_rextsize = scounter; - return 0; - case XFS_SBS_RBMBLOCKS: - scounter = mp->m_sb.sb_rbmblocks; - scounter += delta; - if (scounter < 0) { - ASSERT(0); - return XFS_ERROR(EINVAL); - } - mp->m_sb.sb_rbmblocks = scounter; - return 0; - case XFS_SBS_RBLOCKS: - lcounter = (long long)mp->m_sb.sb_rblocks; - lcounter += delta; - if (lcounter < 0) { - ASSERT(0); - return XFS_ERROR(EINVAL); - } - mp->m_sb.sb_rblocks = lcounter; - return 0; - case XFS_SBS_REXTENTS: - lcounter = (long long)mp->m_sb.sb_rextents; - lcounter += delta; - if (lcounter < 0) { - ASSERT(0); - return XFS_ERROR(EINVAL); - } - mp->m_sb.sb_rextents = lcounter; - return 0; - case XFS_SBS_REXTSLOG: - scounter = mp->m_sb.sb_rextslog; - scounter += delta; - if (scounter < 0) { - ASSERT(0); - return XFS_ERROR(EINVAL); - } - mp->m_sb.sb_rextslog = scounter; - return 0; - default: - ASSERT(0); - return XFS_ERROR(EINVAL); - } -} - -/* - * xfs_mod_incore_sb() is used to change a field in the in-core - * superblock structure by the specified delta. This modification - * is protected by the m_sb_lock. Just use the xfs_mod_incore_sb_unlocked() - * routine to do the work. - */ -int -xfs_mod_incore_sb( - struct xfs_mount *mp, - xfs_sb_field_t field, - int64_t delta, - int rsvd) -{ - int status; - -#ifdef HAVE_PERCPU_SB - ASSERT(field < XFS_SBS_ICOUNT || field > XFS_SBS_FDBLOCKS); -#endif - spin_lock(&mp->m_sb_lock); - status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); - spin_unlock(&mp->m_sb_lock); - - return status; -} - -/* - * Change more than one field in the in-core superblock structure at a time. - * - * The fields and changes to those fields are specified in the array of - * xfs_mod_sb structures passed in. Either all of the specified deltas - * will be applied or none of them will. If any modified field dips below 0, - * then all modifications will be backed out and EINVAL will be returned. - * - * Note that this function may not be used for the superblock values that - * are tracked with the in-memory per-cpu counters - a direct call to - * xfs_icsb_modify_counters is required for these. - */ -int -xfs_mod_incore_sb_batch( - struct xfs_mount *mp, - xfs_mod_sb_t *msb, - uint nmsb, - int rsvd) -{ - xfs_mod_sb_t *msbp; - int error = 0; - - /* - * Loop through the array of mod structures and apply each individually. - * If any fail, then back out all those which have already been applied. - * Do all of this within the scope of the m_sb_lock so that all of the - * changes will be atomic. - */ - spin_lock(&mp->m_sb_lock); - for (msbp = msb; msbp < (msb + nmsb); msbp++) { - ASSERT(msbp->msb_field < XFS_SBS_ICOUNT || - msbp->msb_field > XFS_SBS_FDBLOCKS); - - error = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field, - msbp->msb_delta, rsvd); - if (error) - goto unwind; - } - spin_unlock(&mp->m_sb_lock); - return 0; - -unwind: - while (--msbp >= msb) { - error = xfs_mod_incore_sb_unlocked(mp, msbp->msb_field, - -msbp->msb_delta, rsvd); - ASSERT(error == 0); - } - spin_unlock(&mp->m_sb_lock); - return error; -} - -/* - * xfs_getsb() is called to obtain the buffer for the superblock. - * The buffer is returned locked and read in from disk. - * The buffer should be released with a call to xfs_brelse(). - * - * If the flags parameter is BUF_TRYLOCK, then we'll only return - * the superblock buffer if it can be locked without sleeping. - * If it can't then we'll return NULL. - */ -struct xfs_buf * -xfs_getsb( - struct xfs_mount *mp, - int flags) -{ - struct xfs_buf *bp = mp->m_sb_bp; - - if (!xfs_buf_trylock(bp)) { - if (flags & XBF_TRYLOCK) - return NULL; - xfs_buf_lock(bp); - } - - xfs_buf_hold(bp); - ASSERT(XFS_BUF_ISDONE(bp)); - return bp; -} - -/* - * Used to free the superblock along various error paths. - */ -void -xfs_freesb( - struct xfs_mount *mp) -{ - struct xfs_buf *bp = mp->m_sb_bp; - - xfs_buf_lock(bp); - mp->m_sb_bp = NULL; - xfs_buf_relse(bp); -} - -/* - * Used to log changes to the superblock unit and width fields which could - * be altered by the mount options, as well as any potential sb_features2 - * fixup. Only the first superblock is updated. - */ -int -xfs_mount_log_sb( - xfs_mount_t *mp, - __int64_t fields) -{ - xfs_trans_t *tp; - int error; - - ASSERT(fields & (XFS_SB_UNIT | XFS_SB_WIDTH | XFS_SB_UUID | - XFS_SB_FEATURES2 | XFS_SB_BAD_FEATURES2 | - XFS_SB_VERSIONNUM)); - - tp = xfs_trans_alloc(mp, XFS_TRANS_SB_UNIT); - error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, - XFS_DEFAULT_LOG_COUNT); - if (error) { - xfs_trans_cancel(tp, 0); - return error; - } - xfs_mod_sb(tp, fields); - error = xfs_trans_commit(tp, 0); - return error; -} - -/* - * If the underlying (data/log/rt) device is readonly, there are some - * operations that cannot proceed. - */ -int -xfs_dev_is_read_only( - struct xfs_mount *mp, - char *message) -{ - if (xfs_readonly_buftarg(mp->m_ddev_targp) || - xfs_readonly_buftarg(mp->m_logdev_targp) || - (mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) { - xfs_notice(mp, "%s required on read-only device.", message); - xfs_notice(mp, "write access unavailable, cannot proceed."); - return EROFS; - } - return 0; -} - -#ifdef HAVE_PERCPU_SB -/* - * Per-cpu incore superblock counters - * - * Simple concept, difficult implementation - * - * Basically, replace the incore superblock counters with a distributed per cpu - * counter for contended fields (e.g. free block count). - * - * Difficulties arise in that the incore sb is used for ENOSPC checking, and - * hence needs to be accurately read when we are running low on space. Hence - * there is a method to enable and disable the per-cpu counters based on how - * much "stuff" is available in them. - * - * Basically, a counter is enabled if there is enough free resource to justify - * running a per-cpu fast-path. If the per-cpu counter runs out (i.e. a local - * ENOSPC), then we disable the counters to synchronise all callers and - * re-distribute the available resources. - * - * If, once we redistributed the available resources, we still get a failure, - * we disable the per-cpu counter and go through the slow path. - * - * The slow path is the current xfs_mod_incore_sb() function. This means that - * when we disable a per-cpu counter, we need to drain its resources back to - * the global superblock. We do this after disabling the counter to prevent - * more threads from queueing up on the counter. - * - * Essentially, this means that we still need a lock in the fast path to enable - * synchronisation between the global counters and the per-cpu counters. This - * is not a problem because the lock will be local to a CPU almost all the time - * and have little contention except when we get to ENOSPC conditions. - * - * Basically, this lock becomes a barrier that enables us to lock out the fast - * path while we do things like enabling and disabling counters and - * synchronising the counters. - * - * Locking rules: - * - * 1. m_sb_lock before picking up per-cpu locks - * 2. per-cpu locks always picked up via for_each_online_cpu() order - * 3. accurate counter sync requires m_sb_lock + per cpu locks - * 4. modifying per-cpu counters requires holding per-cpu lock - * 5. modifying global counters requires holding m_sb_lock - * 6. enabling or disabling a counter requires holding the m_sb_lock - * and _none_ of the per-cpu locks. - * - * Disabled counters are only ever re-enabled by a balance operation - * that results in more free resources per CPU than a given threshold. - * To ensure counters don't remain disabled, they are rebalanced when - * the global resource goes above a higher threshold (i.e. some hysteresis - * is present to prevent thrashing). - */ - -#ifdef CONFIG_HOTPLUG_CPU -/* - * hot-plug CPU notifier support. - * - * We need a notifier per filesystem as we need to be able to identify - * the filesystem to balance the counters out. This is achieved by - * having a notifier block embedded in the xfs_mount_t and doing pointer - * magic to get the mount pointer from the notifier block address. - */ -STATIC int -xfs_icsb_cpu_notify( - struct notifier_block *nfb, - unsigned long action, - void *hcpu) -{ - xfs_icsb_cnts_t *cntp; - xfs_mount_t *mp; - - mp = (xfs_mount_t *)container_of(nfb, xfs_mount_t, m_icsb_notifier); - cntp = (xfs_icsb_cnts_t *) - per_cpu_ptr(mp->m_sb_cnts, (unsigned long)hcpu); - switch (action) { - case CPU_UP_PREPARE: - case CPU_UP_PREPARE_FROZEN: - /* Easy Case - initialize the area and locks, and - * then rebalance when online does everything else for us. */ - memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); - break; - case CPU_ONLINE: - case CPU_ONLINE_FROZEN: - xfs_icsb_lock(mp); - xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0); - xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0); - xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0); - xfs_icsb_unlock(mp); - break; - case CPU_DEAD: - case CPU_DEAD_FROZEN: - /* Disable all the counters, then fold the dead cpu's - * count into the total on the global superblock and - * re-enable the counters. */ - xfs_icsb_lock(mp); - spin_lock(&mp->m_sb_lock); - xfs_icsb_disable_counter(mp, XFS_SBS_ICOUNT); - xfs_icsb_disable_counter(mp, XFS_SBS_IFREE); - xfs_icsb_disable_counter(mp, XFS_SBS_FDBLOCKS); - - mp->m_sb.sb_icount += cntp->icsb_icount; - mp->m_sb.sb_ifree += cntp->icsb_ifree; - mp->m_sb.sb_fdblocks += cntp->icsb_fdblocks; - - memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); - - xfs_icsb_balance_counter_locked(mp, XFS_SBS_ICOUNT, 0); - xfs_icsb_balance_counter_locked(mp, XFS_SBS_IFREE, 0); - xfs_icsb_balance_counter_locked(mp, XFS_SBS_FDBLOCKS, 0); - spin_unlock(&mp->m_sb_lock); - xfs_icsb_unlock(mp); - break; - } - - return NOTIFY_OK; -} -#endif /* CONFIG_HOTPLUG_CPU */ - -int -xfs_icsb_init_counters( - xfs_mount_t *mp) -{ - xfs_icsb_cnts_t *cntp; - int i; - - mp->m_sb_cnts = alloc_percpu(xfs_icsb_cnts_t); - if (mp->m_sb_cnts == NULL) - return -ENOMEM; - -#ifdef CONFIG_HOTPLUG_CPU - mp->m_icsb_notifier.notifier_call = xfs_icsb_cpu_notify; - mp->m_icsb_notifier.priority = 0; - register_hotcpu_notifier(&mp->m_icsb_notifier); -#endif /* CONFIG_HOTPLUG_CPU */ - - for_each_online_cpu(i) { - cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); - memset(cntp, 0, sizeof(xfs_icsb_cnts_t)); - } - - mutex_init(&mp->m_icsb_mutex); - - /* - * start with all counters disabled so that the - * initial balance kicks us off correctly - */ - mp->m_icsb_counters = -1; - return 0; -} - -void -xfs_icsb_reinit_counters( - xfs_mount_t *mp) -{ - xfs_icsb_lock(mp); - /* - * start with all counters disabled so that the - * initial balance kicks us off correctly - */ - mp->m_icsb_counters = -1; - xfs_icsb_balance_counter(mp, XFS_SBS_ICOUNT, 0); - xfs_icsb_balance_counter(mp, XFS_SBS_IFREE, 0); - xfs_icsb_balance_counter(mp, XFS_SBS_FDBLOCKS, 0); - xfs_icsb_unlock(mp); -} - -void -xfs_icsb_destroy_counters( - xfs_mount_t *mp) -{ - if (mp->m_sb_cnts) { - unregister_hotcpu_notifier(&mp->m_icsb_notifier); - free_percpu(mp->m_sb_cnts); - } - mutex_destroy(&mp->m_icsb_mutex); -} - -STATIC void -xfs_icsb_lock_cntr( - xfs_icsb_cnts_t *icsbp) -{ - while (test_and_set_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags)) { - ndelay(1000); - } -} - -STATIC void -xfs_icsb_unlock_cntr( - xfs_icsb_cnts_t *icsbp) -{ - clear_bit(XFS_ICSB_FLAG_LOCK, &icsbp->icsb_flags); -} - - -STATIC void -xfs_icsb_lock_all_counters( - xfs_mount_t *mp) -{ - xfs_icsb_cnts_t *cntp; - int i; - - for_each_online_cpu(i) { - cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); - xfs_icsb_lock_cntr(cntp); - } -} - -STATIC void -xfs_icsb_unlock_all_counters( - xfs_mount_t *mp) -{ - xfs_icsb_cnts_t *cntp; - int i; - - for_each_online_cpu(i) { - cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); - xfs_icsb_unlock_cntr(cntp); - } -} - -STATIC void -xfs_icsb_count( - xfs_mount_t *mp, - xfs_icsb_cnts_t *cnt, - int flags) -{ - xfs_icsb_cnts_t *cntp; - int i; - - memset(cnt, 0, sizeof(xfs_icsb_cnts_t)); - - if (!(flags & XFS_ICSB_LAZY_COUNT)) - xfs_icsb_lock_all_counters(mp); - - for_each_online_cpu(i) { - cntp = (xfs_icsb_cnts_t *)per_cpu_ptr(mp->m_sb_cnts, i); - cnt->icsb_icount += cntp->icsb_icount; - cnt->icsb_ifree += cntp->icsb_ifree; - cnt->icsb_fdblocks += cntp->icsb_fdblocks; - } - - if (!(flags & XFS_ICSB_LAZY_COUNT)) - xfs_icsb_unlock_all_counters(mp); -} - -STATIC int -xfs_icsb_counter_disabled( - xfs_mount_t *mp, - xfs_sb_field_t field) -{ - ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); - return test_bit(field, &mp->m_icsb_counters); -} - -STATIC void -xfs_icsb_disable_counter( - xfs_mount_t *mp, - xfs_sb_field_t field) -{ - xfs_icsb_cnts_t cnt; - - ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); - - /* - * If we are already disabled, then there is nothing to do - * here. We check before locking all the counters to avoid - * the expensive lock operation when being called in the - * slow path and the counter is already disabled. This is - * safe because the only time we set or clear this state is under - * the m_icsb_mutex. - */ - if (xfs_icsb_counter_disabled(mp, field)) - return; - - xfs_icsb_lock_all_counters(mp); - if (!test_and_set_bit(field, &mp->m_icsb_counters)) { - /* drain back to superblock */ - - xfs_icsb_count(mp, &cnt, XFS_ICSB_LAZY_COUNT); - switch(field) { - case XFS_SBS_ICOUNT: - mp->m_sb.sb_icount = cnt.icsb_icount; - break; - case XFS_SBS_IFREE: - mp->m_sb.sb_ifree = cnt.icsb_ifree; - break; - case XFS_SBS_FDBLOCKS: - mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; - break; - default: - BUG(); - } - } - - xfs_icsb_unlock_all_counters(mp); -} - -STATIC void -xfs_icsb_enable_counter( - xfs_mount_t *mp, - xfs_sb_field_t field, - uint64_t count, - uint64_t resid) -{ - xfs_icsb_cnts_t *cntp; - int i; - - ASSERT((field >= XFS_SBS_ICOUNT) && (field <= XFS_SBS_FDBLOCKS)); - - xfs_icsb_lock_all_counters(mp); - for_each_online_cpu(i) { - cntp = per_cpu_ptr(mp->m_sb_cnts, i); - switch (field) { - case XFS_SBS_ICOUNT: - cntp->icsb_icount = count + resid; - break; - case XFS_SBS_IFREE: - cntp->icsb_ifree = count + resid; - break; - case XFS_SBS_FDBLOCKS: - cntp->icsb_fdblocks = count + resid; - break; - default: - BUG(); - break; - } - resid = 0; - } - clear_bit(field, &mp->m_icsb_counters); - xfs_icsb_unlock_all_counters(mp); -} - -void -xfs_icsb_sync_counters_locked( - xfs_mount_t *mp, - int flags) -{ - xfs_icsb_cnts_t cnt; - - xfs_icsb_count(mp, &cnt, flags); - - if (!xfs_icsb_counter_disabled(mp, XFS_SBS_ICOUNT)) - mp->m_sb.sb_icount = cnt.icsb_icount; - if (!xfs_icsb_counter_disabled(mp, XFS_SBS_IFREE)) - mp->m_sb.sb_ifree = cnt.icsb_ifree; - if (!xfs_icsb_counter_disabled(mp, XFS_SBS_FDBLOCKS)) - mp->m_sb.sb_fdblocks = cnt.icsb_fdblocks; -} - -/* - * Accurate update of per-cpu counters to incore superblock - */ -void -xfs_icsb_sync_counters( - xfs_mount_t *mp, - int flags) -{ - spin_lock(&mp->m_sb_lock); - xfs_icsb_sync_counters_locked(mp, flags); - spin_unlock(&mp->m_sb_lock); -} - -/* - * Balance and enable/disable counters as necessary. - * - * Thresholds for re-enabling counters are somewhat magic. inode counts are - * chosen to be the same number as single on disk allocation chunk per CPU, and - * free blocks is something far enough zero that we aren't going thrash when we - * get near ENOSPC. We also need to supply a minimum we require per cpu to - * prevent looping endlessly when xfs_alloc_space asks for more than will - * be distributed to a single CPU but each CPU has enough blocks to be - * reenabled. - * - * Note that we can be called when counters are already disabled. - * xfs_icsb_disable_counter() optimises the counter locking in this case to - * prevent locking every per-cpu counter needlessly. - */ - -#define XFS_ICSB_INO_CNTR_REENABLE (uint64_t)64 -#define XFS_ICSB_FDBLK_CNTR_REENABLE(mp) \ - (uint64_t)(512 + XFS_ALLOC_SET_ASIDE(mp)) -STATIC void -xfs_icsb_balance_counter_locked( - xfs_mount_t *mp, - xfs_sb_field_t field, - int min_per_cpu) -{ - uint64_t count, resid; - int weight = num_online_cpus(); - uint64_t min = (uint64_t)min_per_cpu; - - /* disable counter and sync counter */ - xfs_icsb_disable_counter(mp, field); - - /* update counters - first CPU gets residual*/ - switch (field) { - case XFS_SBS_ICOUNT: - count = mp->m_sb.sb_icount; - resid = do_div(count, weight); - if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) - return; - break; - case XFS_SBS_IFREE: - count = mp->m_sb.sb_ifree; - resid = do_div(count, weight); - if (count < max(min, XFS_ICSB_INO_CNTR_REENABLE)) - return; - break; - case XFS_SBS_FDBLOCKS: - count = mp->m_sb.sb_fdblocks; - resid = do_div(count, weight); - if (count < max(min, XFS_ICSB_FDBLK_CNTR_REENABLE(mp))) - return; - break; - default: - BUG(); - count = resid = 0; /* quiet, gcc */ - break; - } - - xfs_icsb_enable_counter(mp, field, count, resid); -} - -STATIC void -xfs_icsb_balance_counter( - xfs_mount_t *mp, - xfs_sb_field_t fields, - int min_per_cpu) -{ - spin_lock(&mp->m_sb_lock); - xfs_icsb_balance_counter_locked(mp, fields, min_per_cpu); - spin_unlock(&mp->m_sb_lock); -} - -int -xfs_icsb_modify_counters( - xfs_mount_t *mp, - xfs_sb_field_t field, - int64_t delta, - int rsvd) -{ - xfs_icsb_cnts_t *icsbp; - long long lcounter; /* long counter for 64 bit fields */ - int ret = 0; - - might_sleep(); -again: - preempt_disable(); - icsbp = this_cpu_ptr(mp->m_sb_cnts); - - /* - * if the counter is disabled, go to slow path - */ - if (unlikely(xfs_icsb_counter_disabled(mp, field))) - goto slow_path; - xfs_icsb_lock_cntr(icsbp); - if (unlikely(xfs_icsb_counter_disabled(mp, field))) { - xfs_icsb_unlock_cntr(icsbp); - goto slow_path; - } - - switch (field) { - case XFS_SBS_ICOUNT: - lcounter = icsbp->icsb_icount; - lcounter += delta; - if (unlikely(lcounter < 0)) - goto balance_counter; - icsbp->icsb_icount = lcounter; - break; - - case XFS_SBS_IFREE: - lcounter = icsbp->icsb_ifree; - lcounter += delta; - if (unlikely(lcounter < 0)) - goto balance_counter; - icsbp->icsb_ifree = lcounter; - break; - - case XFS_SBS_FDBLOCKS: - BUG_ON((mp->m_resblks - mp->m_resblks_avail) != 0); - - lcounter = icsbp->icsb_fdblocks - XFS_ALLOC_SET_ASIDE(mp); - lcounter += delta; - if (unlikely(lcounter < 0)) - goto balance_counter; - icsbp->icsb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp); - break; - default: - BUG(); - break; - } - xfs_icsb_unlock_cntr(icsbp); - preempt_enable(); - return 0; - -slow_path: - preempt_enable(); - - /* - * serialise with a mutex so we don't burn lots of cpu on - * the superblock lock. We still need to hold the superblock - * lock, however, when we modify the global structures. - */ - xfs_icsb_lock(mp); - - /* - * Now running atomically. - * - * If the counter is enabled, someone has beaten us to rebalancing. - * Drop the lock and try again in the fast path.... - */ - if (!(xfs_icsb_counter_disabled(mp, field))) { - xfs_icsb_unlock(mp); - goto again; - } - - /* - * The counter is currently disabled. Because we are - * running atomically here, we know a rebalance cannot - * be in progress. Hence we can go straight to operating - * on the global superblock. We do not call xfs_mod_incore_sb() - * here even though we need to get the m_sb_lock. Doing so - * will cause us to re-enter this function and deadlock. - * Hence we get the m_sb_lock ourselves and then call - * xfs_mod_incore_sb_unlocked() as the unlocked path operates - * directly on the global counters. - */ - spin_lock(&mp->m_sb_lock); - ret = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd); - spin_unlock(&mp->m_sb_lock); - - /* - * Now that we've modified the global superblock, we - * may be able to re-enable the distributed counters - * (e.g. lots of space just got freed). After that - * we are done. - */ - if (ret != ENOSPC) - xfs_icsb_balance_counter(mp, field, 0); - xfs_icsb_unlock(mp); - return ret; - -balance_counter: - xfs_icsb_unlock_cntr(icsbp); - preempt_enable(); - - /* - * We may have multiple threads here if multiple per-cpu - * counters run dry at the same time. This will mean we can - * do more balances than strictly necessary but it is not - * the common slowpath case. - */ - xfs_icsb_lock(mp); - - /* - * running atomically. - * - * This will leave the counter in the correct state for future - * accesses. After the rebalance, we simply try again and our retry - * will either succeed through the fast path or slow path without - * another balance operation being required. - */ - xfs_icsb_balance_counter(mp, field, delta); - xfs_icsb_unlock(mp); - goto again; -} - -#endif |