LXR linux/fs/xfs/xfs

   1/*
   2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
   3 * All Rights Reserved.
   4 *
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of the GNU General Public License as
   7 * published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it would be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write the Free Software Foundation,
  16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18#ifndef XFS_SYNC_H
  19#define XFS_SYNC_H 1
  20
  21struct xfs_mount;
  22struct xfs_perag;
  23
  24struct xfs_eofblocks {
  25        __u32           eof_flags;
  26        kuid_t          eof_uid;
  27        kgid_t          eof_gid;
  28        prid_t          eof_prid;
  29        __u64           eof_min_file_size;
  30        xfs_ino_t       eof_scan_owner;
  31};
  32
  33#define SYNC_WAIT               0x0001  /* wait for i/o to complete */
  34#define SYNC_TRYLOCK            0x0002  /* only try to lock inodes */
  35
  36/*
  37 * tags for inode radix tree
  38 */
  39#define XFS_ICI_NO_TAG          (-1)    /* special flag for an untagged lookup
  40                                           in xfs_inode_ag_iterator */
  41#define XFS_ICI_RECLAIM_TAG     0       /* inode is to be reclaimed */
  42#define XFS_ICI_EOFBLOCKS_TAG   1       /* inode has blocks beyond EOF */
  43
  44/*
  45 * Flags for xfs_iget()
  46 */
  47#define XFS_IGET_CREATE         0x1
  48#define XFS_IGET_UNTRUSTED      0x2
  49#define XFS_IGET_DONTCACHE      0x4
  50
  51int xfs_iget(struct xfs_mount *mp, struct xfs_trans *tp, xfs_ino_t ino,
  52             uint flags, uint lock_flags, xfs_inode_t **ipp);
  53
  54/* recovery needs direct inode allocation capability */
  55struct xfs_inode * xfs_inode_alloc(struct xfs_mount *mp, xfs_ino_t ino);
  56void xfs_inode_free(struct xfs_inode *ip);
  57
  58void xfs_reclaim_worker(struct work_struct *work);
  59
  60int xfs_reclaim_inodes(struct xfs_mount *mp, int mode);
  61int xfs_reclaim_inodes_count(struct xfs_mount *mp);
  62long xfs_reclaim_inodes_nr(struct xfs_mount *mp, int nr_to_scan);
  63
  64void xfs_inode_set_reclaim_tag(struct xfs_inode *ip);
  65
  66void xfs_inode_set_eofblocks_tag(struct xfs_inode *ip);
  67void xfs_inode_clear_eofblocks_tag(struct xfs_inode *ip);
  68int xfs_icache_free_eofblocks(struct xfs_mount *, struct xfs_eofblocks *);
  69int xfs_inode_free_quota_eofblocks(struct xfs_inode *ip);
  70void xfs_eofblocks_worker(struct work_struct *);
  71
  72int xfs_inode_ag_iterator(struct xfs_mount *mp,
  73        int (*execute)(struct xfs_inode *ip, int flags, void *args),
  74        int flags, void *args);
  75int xfs_inode_ag_iterator_tag(struct xfs_mount *mp,
  76        int (*execute)(struct xfs_inode *ip, int flags, void *args),
  77        int flags, void *args, int tag);
  78
  79static inline int
  80xfs_fs_eofblocks_from_user(
  81        struct xfs_fs_eofblocks         *src,
  82        struct xfs_eofblocks            *dst)
  83{
  84        if (src->eof_version != XFS_EOFBLOCKS_VERSION)
  85                return -EINVAL;
  86
  87        if (src->eof_flags & ~XFS_EOF_FLAGS_VALID)
  88                return -EINVAL;
  89
  90        if (memchr_inv(&src->pad32, 0, sizeof(src->pad32)) ||
  91            memchr_inv(src->pad64, 0, sizeof(src->pad64)))
  92                return -EINVAL;
  93
  94        dst->eof_flags = src->eof_flags;
  95        dst->eof_prid = src->eof_prid;
  96        dst->eof_min_file_size = src->eof_min_file_size;
  97        dst->eof_scan_owner = NULLFSINO;
  98
  99        dst->eof_uid = INVALID_UID;
 100        if (src->eof_flags & XFS_EOF_FLAGS_UID) {
 101                dst->eof_uid = make_kuid(current_user_ns(), src->eof_uid);
 102                if (!uid_valid(dst->eof_uid))
 103                        return -EINVAL;
 104        }
 105
 106        dst->eof_gid = INVALID_GID;
 107        if (src->eof_flags & XFS_EOF_FLAGS_GID) {
 108                dst->eof_gid = make_kgid(current_user_ns(), src->eof_gid);
 109                if (!gid_valid(dst->eof_gid))
 110                        return -EINVAL;
 111        }
 112        return 0;
 113}
 114
 115#endif
 116