diff options
| -rw-r--r-- | fs/xfs/xfs_bmap.c | 114 |
1 files changed, 93 insertions, 21 deletions
diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c index cdb2d3348583..572a858ac0f4 100644 --- a/fs/xfs/xfs_bmap.c +++ b/fs/xfs/xfs_bmap.c @@ -147,7 +147,10 @@ xfs_bmap_local_to_extents( xfs_fsblock_t *firstblock, /* first block allocated in xaction */ xfs_extlen_t total, /* total blocks needed by transaction */ int *logflagsp, /* inode logging flags */ - int whichfork); /* data or attr fork */ + int whichfork, /* data or attr fork */ + void (*init_fn)(struct xfs_buf *bp, + struct xfs_inode *ip, + struct xfs_ifork *ifp)); /* * Search the extents list for the inode, for the extent containing bno. @@ -357,7 +360,42 @@ xfs_bmap_add_attrfork_extents( } /* - * Called from xfs_bmap_add_attrfork to handle local format files. + * Block initialisation functions for local to extent format conversion. + * As these get more complex, they will be moved to the relevant files, + * but for now they are too simple to worry about. + */ +STATIC void +xfs_bmap_local_to_extents_init_fn( + struct xfs_buf *bp, + struct xfs_inode *ip, + struct xfs_ifork *ifp) +{ + bp->b_ops = &xfs_bmbt_buf_ops; + memcpy(bp->b_addr, ifp->if_u1.if_data, ifp->if_bytes); +} + +STATIC void +xfs_symlink_local_to_remote( + struct xfs_buf *bp, + struct xfs_inode *ip, + struct xfs_ifork *ifp) +{ + /* remote symlink blocks are not verifiable until CRCs come along */ + bp->b_ops = NULL; + memcpy(bp->b_addr, ifp->if_u1.if_data, ifp->if_bytes); +} + +/* + * Called from xfs_bmap_add_attrfork to handle local format files. Each + * different data fork content type needs a different callout to do the + * conversion. Some are basic and only require special block initialisation + * callouts for the data formating, others (directories) are so specialised they + * handle everything themselves. + * + * XXX (dgc): investigate whether directory conversion can use the generic + * formatting callout. It should be possible - it's just a very complex + * formatter. it would also require passing the transaction through to the init + * function. */ STATIC int /* error */ xfs_bmap_add_attrfork_local( @@ -368,25 +406,29 @@ xfs_bmap_add_attrfork_local( int *flags) /* inode logging flags */ { xfs_da_args_t dargs; /* args for dir/attr code */ - int error; /* error return value */ - xfs_mount_t *mp; /* mount structure pointer */ if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip)) return 0; + if (S_ISDIR(ip->i_d.di_mode)) { - mp = ip->i_mount; memset(&dargs, 0, sizeof(dargs)); dargs.dp = ip; dargs.firstblock = firstblock; dargs.flist = flist; - dargs.total = mp->m_dirblkfsbs; + dargs.total = ip->i_mount->m_dirblkfsbs; dargs.whichfork = XFS_DATA_FORK; dargs.trans = tp; - error = xfs_dir2_sf_to_block(&dargs); - } else - error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags, - XFS_DATA_FORK); - return error; + return xfs_dir2_sf_to_block(&dargs); + } + + if (S_ISLNK(ip->i_d.di_mode)) + return xfs_bmap_local_to_extents(tp, ip, firstblock, 1, + flags, XFS_DATA_FORK, + xfs_symlink_local_to_remote); + + return xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags, + XFS_DATA_FORK, + xfs_bmap_local_to_extents_init_fn); } /* @@ -3221,7 +3263,10 @@ xfs_bmap_local_to_extents( xfs_fsblock_t *firstblock, /* first block allocated in xaction */ xfs_extlen_t total, /* total blocks needed by transaction */ int *logflagsp, /* inode logging flags */ - int whichfork) /* data or attr fork */ + int whichfork, + void (*init_fn)(struct xfs_buf *bp, + struct xfs_inode *ip, + struct xfs_ifork *ifp)) { int error; /* error return value */ int flags; /* logging flags returned */ @@ -3241,12 +3286,12 @@ xfs_bmap_local_to_extents( xfs_buf_t *bp; /* buffer for extent block */ xfs_bmbt_rec_host_t *ep;/* extent record pointer */ + ASSERT((ifp->if_flags & + (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) == XFS_IFINLINE); memset(&args, 0, sizeof(args)); args.tp = tp; args.mp = ip->i_mount; args.firstblock = *firstblock; - ASSERT((ifp->if_flags & - (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) == XFS_IFINLINE); /* * Allocate a block. We know we need only one, since the * file currently fits in an inode. @@ -3262,17 +3307,20 @@ xfs_bmap_local_to_extents( args.mod = args.minleft = args.alignment = args.wasdel = args.isfl = args.minalignslop = 0; args.minlen = args.maxlen = args.prod = 1; - if ((error = xfs_alloc_vextent(&args))) + error = xfs_alloc_vextent(&args); + if (error) goto done; - /* - * Can't fail, the space was reserved. - */ + + /* Can't fail, the space was reserved. */ ASSERT(args.fsbno != NULLFSBLOCK); ASSERT(args.len == 1); *firstblock = args.fsbno; bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0); - bp->b_ops = &xfs_bmbt_buf_ops; - memcpy(bp->b_addr, ifp->if_u1.if_data, ifp->if_bytes); + + /* initialise the block and copy the data */ + init_fn(bp, ip, ifp); + + /* account for the change in fork size and log everything */ xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1); xfs_bmap_forkoff_reset(args.mp, ip, whichfork); xfs_idata_realloc(ip, -ifp->if_bytes, whichfork); @@ -4919,8 +4967,32 @@ xfs_bmapi_write( XFS_STATS_INC(xs_blk_mapw); if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) { + /* + * XXX (dgc): This assumes we are only called for inodes that + * contain content neutral data in local format. Anything that + * contains caller-specific data in local format that needs + * transformation to move to a block format needs to do the + * conversion to extent format itself. + * + * Directory data forks and attribute forks handle this + * themselves, but with the addition of metadata verifiers every + * data fork in local format now contains caller specific data + * and as such conversion through this function is likely to be + * broken. + * + * The only likely user of this branch is for remote symlinks, + * but we cannot overwrite the data fork contents of the symlink + * (EEXIST occurs higher up the stack) and so it will never go + * from local format to extent format here. Hence I don't think + * this branch is ever executed intentionally and we should + * consider removing it and asserting that xfs_bmapi_write() + * cannot be called directly on local format forks. i.e. callers + * are completely responsible for local to extent format + * conversion, not xfs_bmapi_write(). + */ error = xfs_bmap_local_to_extents(tp, ip, firstblock, total, - &bma.logflags, whichfork); + &bma.logflags, whichfork, + xfs_bmap_local_to_extents_init_fn); if (error) goto error0; } |