diff options
Diffstat (limited to 'lib/ext2fs/ext_attr.c')
| -rw-r--r-- | lib/ext2fs/ext_attr.c | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/lib/ext2fs/ext_attr.c b/lib/ext2fs/ext_attr.c index b5404390..5ebb22bb 100644 --- a/lib/ext2fs/ext_attr.c +++ b/lib/ext2fs/ext_attr.c @@ -1,7 +1,9 @@ /* * ext_attr.c --- extended attribute blocks * - * Copyright (C) Andreas Gruenbacher, <a.gruenbacher@computer.org> + * Copyright (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org> + * + * Copyright (C) 2002 Theodore Ts'o. * * %Begin-Header% * This file may be redistributed under the terms of the GNU Public @@ -96,3 +98,44 @@ errcode_t ext2fs_write_ext_attr(ext2_filsys fs, blk_t block, void *inbuf) ext2fs_mark_changed(fs); return retval; } + +/* + * This function adjusts the reference count of the EA block. + */ +errcode_t ext2fs_adjust_ea_refcount(ext2_filsys fs, blk_t blk, + char *block_buf, int adjust, + __u32 *newcount) +{ + errcode_t retval; + struct ext2_ext_attr_header *header; + char *buf = 0; + + if ((blk >= fs->super->s_blocks_count) || + (blk < fs->super->s_first_data_block)) + return EXT2_ET_BAD_EA_BLOCK_NUM; + + if (!block_buf) { + retval = ext2fs_get_mem(fs->blocksize, (void **) &buf); + if (retval) + return retval; + block_buf = buf; + } + + retval = ext2fs_read_ext_attr(fs, blk, block_buf); + if (retval) + goto errout; + + header = (struct ext2_ext_attr_header *) block_buf; + header->h_refcount += adjust; + if (newcount) + *newcount = header->h_refcount; + + retval = ext2fs_write_ext_attr(fs, blk, block_buf); + if (retval) + goto errout; + +errout: + if (buf) + ext2fs_free_mem((void **) &buf); + return retval; +} |