1813dd6405
To separate the verifiers from iodone functions and associate read and write verifiers at the same time, introduce a buffer verifier operations structure to the xfs_buf. This avoids the need for assigning the write verifier, clearing the iodone function and re-running ioend processing in the read verifier, and gets rid of the nasty "b_pre_io" name for the write verifier function pointer. If we ever need to, it will also be easier to add further content specific callbacks to a buffer with an ops structure in place. We also avoid needing to export verifier functions, instead we can simply export the ops structures for those that are needed outside the function they are defined in. This patch also fixes a directory block readahead verifier issue it exposed. This patch also adds ops callbacks to the inode/alloc btree blocks initialised by growfs. These will need more work before they will work with CRCs. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Phil White <pwhite@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
271 lines
10 KiB
C
271 lines
10 KiB
C
/*
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* Copyright (c) 2000,2002-2003,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_ATTR_LEAF_H__
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#define __XFS_ATTR_LEAF_H__
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/*
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* Attribute storage layout, internal structure, access macros, etc.
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*
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* Attribute lists are structured around Btrees where all the data
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* elements are in the leaf nodes. Attribute names are hashed into an int,
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* then that int is used as the index into the Btree. Since the hashval
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* of an attribute name may not be unique, we may have duplicate keys. The
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* internal links in the Btree are logical block offsets into the file.
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*/
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struct attrlist;
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struct attrlist_cursor_kern;
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struct xfs_attr_list_context;
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struct xfs_da_args;
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struct xfs_da_state;
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struct xfs_da_state_blk;
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struct xfs_inode;
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struct xfs_trans;
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/*========================================================================
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* Attribute structure when equal to XFS_LBSIZE(mp) bytes.
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*========================================================================*/
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/*
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* This is the structure of the leaf nodes in the Btree.
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*
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* Struct leaf_entry's are packed from the top. Name/values grow from the
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* bottom but are not packed. The freemap contains run-length-encoded entries
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* for the free bytes after the leaf_entry's, but only the N largest such,
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* smaller runs are dropped. When the freemap doesn't show enough space
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* for an allocation, we compact the name/value area and try again. If we
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* still don't have enough space, then we have to split the block. The
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* name/value structs (both local and remote versions) must be 32bit aligned.
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*
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* Since we have duplicate hash keys, for each key that matches, compare
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* the actual name string. The root and intermediate node search always
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* takes the first-in-the-block key match found, so we should only have
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* to work "forw"ard. If none matches, continue with the "forw"ard leaf
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* nodes until the hash key changes or the attribute name is found.
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*
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* We store the fact that an attribute is a ROOT/USER/SECURE attribute in
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* the leaf_entry. The namespaces are independent only because we also look
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* at the namespace bit when we are looking for a matching attribute name.
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*
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* We also store an "incomplete" bit in the leaf_entry. It shows that an
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* attribute is in the middle of being created and should not be shown to
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* the user if we crash during the time that the bit is set. We clear the
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* bit when we have finished setting up the attribute. We do this because
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* we cannot create some large attributes inside a single transaction, and we
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* need some indication that we weren't finished if we crash in the middle.
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*/
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#define XFS_ATTR_LEAF_MAPSIZE 3 /* how many freespace slots */
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typedef struct xfs_attr_leaf_map { /* RLE map of free bytes */
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__be16 base; /* base of free region */
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__be16 size; /* length of free region */
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} xfs_attr_leaf_map_t;
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typedef struct xfs_attr_leaf_hdr { /* constant-structure header block */
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xfs_da_blkinfo_t info; /* block type, links, etc. */
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__be16 count; /* count of active leaf_entry's */
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__be16 usedbytes; /* num bytes of names/values stored */
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__be16 firstused; /* first used byte in name area */
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__u8 holes; /* != 0 if blk needs compaction */
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__u8 pad1;
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xfs_attr_leaf_map_t freemap[XFS_ATTR_LEAF_MAPSIZE];
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/* N largest free regions */
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} xfs_attr_leaf_hdr_t;
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typedef struct xfs_attr_leaf_entry { /* sorted on key, not name */
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__be32 hashval; /* hash value of name */
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__be16 nameidx; /* index into buffer of name/value */
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__u8 flags; /* LOCAL/ROOT/SECURE/INCOMPLETE flag */
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__u8 pad2; /* unused pad byte */
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} xfs_attr_leaf_entry_t;
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typedef struct xfs_attr_leaf_name_local {
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__be16 valuelen; /* number of bytes in value */
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__u8 namelen; /* length of name bytes */
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__u8 nameval[1]; /* name/value bytes */
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} xfs_attr_leaf_name_local_t;
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typedef struct xfs_attr_leaf_name_remote {
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__be32 valueblk; /* block number of value bytes */
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__be32 valuelen; /* number of bytes in value */
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__u8 namelen; /* length of name bytes */
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__u8 name[1]; /* name bytes */
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} xfs_attr_leaf_name_remote_t;
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typedef struct xfs_attr_leafblock {
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xfs_attr_leaf_hdr_t hdr; /* constant-structure header block */
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xfs_attr_leaf_entry_t entries[1]; /* sorted on key, not name */
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xfs_attr_leaf_name_local_t namelist; /* grows from bottom of buf */
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xfs_attr_leaf_name_remote_t valuelist; /* grows from bottom of buf */
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} xfs_attr_leafblock_t;
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/*
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* Flags used in the leaf_entry[i].flags field.
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* NOTE: the INCOMPLETE bit must not collide with the flags bits specified
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* on the system call, they are "or"ed together for various operations.
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*/
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#define XFS_ATTR_LOCAL_BIT 0 /* attr is stored locally */
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#define XFS_ATTR_ROOT_BIT 1 /* limit access to trusted attrs */
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#define XFS_ATTR_SECURE_BIT 2 /* limit access to secure attrs */
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#define XFS_ATTR_INCOMPLETE_BIT 7 /* attr in middle of create/delete */
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#define XFS_ATTR_LOCAL (1 << XFS_ATTR_LOCAL_BIT)
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#define XFS_ATTR_ROOT (1 << XFS_ATTR_ROOT_BIT)
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#define XFS_ATTR_SECURE (1 << XFS_ATTR_SECURE_BIT)
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#define XFS_ATTR_INCOMPLETE (1 << XFS_ATTR_INCOMPLETE_BIT)
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/*
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* Conversion macros for converting namespace bits from argument flags
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* to ondisk flags.
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*/
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#define XFS_ATTR_NSP_ARGS_MASK (ATTR_ROOT | ATTR_SECURE)
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#define XFS_ATTR_NSP_ONDISK_MASK (XFS_ATTR_ROOT | XFS_ATTR_SECURE)
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#define XFS_ATTR_NSP_ONDISK(flags) ((flags) & XFS_ATTR_NSP_ONDISK_MASK)
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#define XFS_ATTR_NSP_ARGS(flags) ((flags) & XFS_ATTR_NSP_ARGS_MASK)
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#define XFS_ATTR_NSP_ARGS_TO_ONDISK(x) (((x) & ATTR_ROOT ? XFS_ATTR_ROOT : 0) |\
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((x) & ATTR_SECURE ? XFS_ATTR_SECURE : 0))
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#define XFS_ATTR_NSP_ONDISK_TO_ARGS(x) (((x) & XFS_ATTR_ROOT ? ATTR_ROOT : 0) |\
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((x) & XFS_ATTR_SECURE ? ATTR_SECURE : 0))
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/*
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* Alignment for namelist and valuelist entries (since they are mixed
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* there can be only one alignment value)
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*/
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#define XFS_ATTR_LEAF_NAME_ALIGN ((uint)sizeof(xfs_dablk_t))
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/*
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* Cast typed pointers for "local" and "remote" name/value structs.
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*/
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static inline xfs_attr_leaf_name_remote_t *
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xfs_attr_leaf_name_remote(xfs_attr_leafblock_t *leafp, int idx)
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{
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return (xfs_attr_leaf_name_remote_t *)
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&((char *)leafp)[be16_to_cpu(leafp->entries[idx].nameidx)];
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}
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static inline xfs_attr_leaf_name_local_t *
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xfs_attr_leaf_name_local(xfs_attr_leafblock_t *leafp, int idx)
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{
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return (xfs_attr_leaf_name_local_t *)
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&((char *)leafp)[be16_to_cpu(leafp->entries[idx].nameidx)];
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}
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static inline char *xfs_attr_leaf_name(xfs_attr_leafblock_t *leafp, int idx)
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{
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return &((char *)leafp)[be16_to_cpu(leafp->entries[idx].nameidx)];
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}
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/*
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* Calculate total bytes used (including trailing pad for alignment) for
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* a "local" name/value structure, a "remote" name/value structure, and
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* a pointer which might be either.
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*/
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static inline int xfs_attr_leaf_entsize_remote(int nlen)
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{
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return ((uint)sizeof(xfs_attr_leaf_name_remote_t) - 1 + (nlen) + \
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XFS_ATTR_LEAF_NAME_ALIGN - 1) & ~(XFS_ATTR_LEAF_NAME_ALIGN - 1);
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}
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static inline int xfs_attr_leaf_entsize_local(int nlen, int vlen)
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{
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return ((uint)sizeof(xfs_attr_leaf_name_local_t) - 1 + (nlen) + (vlen) +
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XFS_ATTR_LEAF_NAME_ALIGN - 1) & ~(XFS_ATTR_LEAF_NAME_ALIGN - 1);
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}
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static inline int xfs_attr_leaf_entsize_local_max(int bsize)
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{
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return (((bsize) >> 1) + ((bsize) >> 2));
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}
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/*
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* Used to keep a list of "remote value" extents when unlinking an inode.
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*/
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typedef struct xfs_attr_inactive_list {
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xfs_dablk_t valueblk; /* block number of value bytes */
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int valuelen; /* number of bytes in value */
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} xfs_attr_inactive_list_t;
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/*========================================================================
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* Function prototypes for the kernel.
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*========================================================================*/
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/*
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* Internal routines when attribute fork size < XFS_LITINO(mp).
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*/
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void xfs_attr_shortform_create(struct xfs_da_args *args);
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void xfs_attr_shortform_add(struct xfs_da_args *args, int forkoff);
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int xfs_attr_shortform_lookup(struct xfs_da_args *args);
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int xfs_attr_shortform_getvalue(struct xfs_da_args *args);
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int xfs_attr_shortform_to_leaf(struct xfs_da_args *args);
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int xfs_attr_shortform_remove(struct xfs_da_args *args);
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int xfs_attr_shortform_list(struct xfs_attr_list_context *context);
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int xfs_attr_shortform_allfit(struct xfs_buf *bp, struct xfs_inode *dp);
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int xfs_attr_shortform_bytesfit(xfs_inode_t *dp, int bytes);
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/*
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* Internal routines when attribute fork size == XFS_LBSIZE(mp).
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*/
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int xfs_attr_leaf_to_node(struct xfs_da_args *args);
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int xfs_attr_leaf_to_shortform(struct xfs_buf *bp,
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struct xfs_da_args *args, int forkoff);
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int xfs_attr_leaf_clearflag(struct xfs_da_args *args);
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int xfs_attr_leaf_setflag(struct xfs_da_args *args);
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int xfs_attr_leaf_flipflags(xfs_da_args_t *args);
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/*
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* Routines used for growing the Btree.
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*/
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int xfs_attr_leaf_split(struct xfs_da_state *state,
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struct xfs_da_state_blk *oldblk,
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struct xfs_da_state_blk *newblk);
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int xfs_attr_leaf_lookup_int(struct xfs_buf *leaf,
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struct xfs_da_args *args);
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int xfs_attr_leaf_getvalue(struct xfs_buf *bp, struct xfs_da_args *args);
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int xfs_attr_leaf_add(struct xfs_buf *leaf_buffer,
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struct xfs_da_args *args);
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int xfs_attr_leaf_remove(struct xfs_buf *leaf_buffer,
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struct xfs_da_args *args);
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int xfs_attr_leaf_list_int(struct xfs_buf *bp,
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struct xfs_attr_list_context *context);
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/*
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* Routines used for shrinking the Btree.
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*/
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int xfs_attr_leaf_toosmall(struct xfs_da_state *state, int *retval);
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void xfs_attr_leaf_unbalance(struct xfs_da_state *state,
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struct xfs_da_state_blk *drop_blk,
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struct xfs_da_state_blk *save_blk);
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int xfs_attr_root_inactive(struct xfs_trans **trans, struct xfs_inode *dp);
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/*
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* Utility routines.
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*/
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xfs_dahash_t xfs_attr_leaf_lasthash(struct xfs_buf *bp, int *count);
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int xfs_attr_leaf_order(struct xfs_buf *leaf1_bp,
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struct xfs_buf *leaf2_bp);
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int xfs_attr_leaf_newentsize(int namelen, int valuelen, int blocksize,
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int *local);
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int xfs_attr_leaf_read(struct xfs_trans *tp, struct xfs_inode *dp,
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xfs_dablk_t bno, xfs_daddr_t mappedbno,
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struct xfs_buf **bpp);
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extern const struct xfs_buf_ops xfs_attr_leaf_buf_ops;
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#endif /* __XFS_ATTR_LEAF_H__ */
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