fs/xfs/xfs_icache.h

   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
  21 struct xfs_mount;
  22 struct xfs_perag;
  23
  24 struct 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 };
  31
  32 #define SYNC_WAIT               0x0001  /* wait for i/o to complete */
  33 #define SYNC_TRYLOCK            0x0002  /* only try to lock inodes */
  34
  35 /*
  36  * tags for inode radix tree
  37  */
  38 #define XFS_ICI_NO_TAG          (-1)    /* special flag for an untagged lookup
  39                                            in xfs_inode_ag_iterator */
  40 #define XFS_ICI_RECLAIM_TAG     0       /* inode is to be reclaimed */
  41 #define XFS_ICI_EOFBLOCKS_TAG   1       /* inode has blocks beyond EOF */
  42 #define XFS_ICI_COWBLOCKS_TAG   2       /* inode can have cow blocks to gc */
  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
  51 int 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 */
  55 struct xfs_inode * xfs_inode_alloc(struct xfs_mount *mp, xfs_ino_t ino);
  56 void xfs_inode_free(struct xfs_inode *ip);
  57
  58 void xfs_reclaim_worker(struct work_struct *work);
  59
  60 int xfs_reclaim_inodes(struct xfs_mount *mp, int mode);
  61 int xfs_reclaim_inodes_count(struct xfs_mount *mp);
  62 long xfs_reclaim_inodes_nr(struct xfs_mount *mp, int nr_to_scan);
  63
  64 void xfs_inode_set_reclaim_tag(struct xfs_inode *ip);
  65
  66 void xfs_inode_set_eofblocks_tag(struct xfs_inode *ip);
  67 void xfs_inode_clear_eofblocks_tag(struct xfs_inode *ip);
  68 int xfs_icache_free_eofblocks(struct xfs_mount *, struct xfs_eofblocks *);
  69 int xfs_inode_free_quota_eofblocks(struct xfs_inode *ip);
  70 void xfs_eofblocks_worker(struct work_struct *);
  71 void xfs_queue_eofblocks(struct xfs_mount *);
  72
  73 void xfs_inode_set_cowblocks_tag(struct xfs_inode *ip);
  74 void xfs_inode_clear_cowblocks_tag(struct xfs_inode *ip);
  75 int xfs_icache_free_cowblocks(struct xfs_mount *, struct xfs_eofblocks *);
  76 int xfs_inode_free_quota_cowblocks(struct xfs_inode *ip);
  77 void xfs_cowblocks_worker(struct work_struct *);
  78
  79 int xfs_inode_ag_iterator(struct xfs_mount *mp,
  80         int (*execute)(struct xfs_inode *ip, int flags, void *args),
  81         int flags, void *args);
  82 int xfs_inode_ag_iterator_tag(struct xfs_mount *mp,
  83         int (*execute)(struct xfs_inode *ip, int flags, void *args),
  84         int flags, void *args, int tag);
  85
  86 static inline int
  87 xfs_fs_eofblocks_from_user(
  88         struct xfs_fs_eofblocks         *src,
  89         struct xfs_eofblocks            *dst)
  90 {
  91         if (src->eof_version != XFS_EOFBLOCKS_VERSION)
  92                 return -EINVAL;
  93
  94         if (src->eof_flags & ~XFS_EOF_FLAGS_VALID)
  95                 return -EINVAL;
  96
  97         if (memchr_inv(&src->pad32, 0, sizeof(src->pad32)) ||
  98             memchr_inv(src->pad64, 0, sizeof(src->pad64)))
  99                 return -EINVAL;
 100
 101         dst->eof_flags = src->eof_flags;
 102         dst->eof_prid = src->eof_prid;
 103         dst->eof_min_file_size = src->eof_min_file_size;
 104
 105         dst->eof_uid = INVALID_UID;
 106         if (src->eof_flags & XFS_EOF_FLAGS_UID) {
 107                 dst->eof_uid = make_kuid(current_user_ns(), src->eof_uid);
 108                 if (!uid_valid(dst->eof_uid))
 109                         return -EINVAL;
 110         }
 111
 112         dst->eof_gid = INVALID_GID;
 113         if (src->eof_flags & XFS_EOF_FLAGS_GID) {
 114                 dst->eof_gid = make_kgid(current_user_ns(), src->eof_gid);
 115                 if (!gid_valid(dst->eof_gid))
 116                         return -EINVAL;
 117         }
 118         return 0;
 119 }
 120
 121 #endif