From: Andreas Dilger Date: Sat, 2 Feb 2008 08:25:03 +0000 (-0700) Subject: Add support for the DIR_NLINK feature. X-Git-Tag: android-x86-6.0-r1~26^2~1476 X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=a7c9cb7d0dc464eda26958595b728a6c3a4cacbc;p=android-x86%2Fexternal-e2fsprogs.git Add support for the DIR_NLINK feature. This patch includes the changes required to e2fsck to understand the nlink count changes made in the kernel. In e2fsck pass 4, when we fetch the actual link count, if it is exceeds 65,000 we set the link count to 1. We silently fix the situation where the nlink count of the directory is 1, and there are fewer than 65,000 subdirectories, since since that can happen naturally. Patch originally from CFS, significantly rewritten by Theodore Ts'o. Signed-off-by: Andreas Dilger Signed-off-by: Kalpak Shah Signed-off-by: "Theodore Ts'o" --- diff --git a/e2fsck/pass4.c b/e2fsck/pass4.c index e6fe6040..ebc19a8e 100644 --- a/e2fsck/pass4.c +++ b/e2fsck/pass4.c @@ -155,6 +155,9 @@ void e2fsck_pass4(e2fsck_t ctx) ext2fs_icount_fetch(ctx->inode_count, i, &link_counted); } + if (ext2fs_test_inode_bitmap(ctx->inode_dir_map, i) && + (link_counted > EXT2_LINK_MAX)) + link_counted = 1; if (link_counted != link_count) { e2fsck_read_inode(ctx, i, inode, "pass4"); pctx.ino = i; @@ -165,7 +168,12 @@ void e2fsck_pass4(e2fsck_t ctx) PR_4_INCONSISTENT_COUNT, &pctx); } pctx.num = link_counted; - if (fix_problem(ctx, PR_4_BAD_REF_COUNT, &pctx)) { + /* i_link_count was previously exceeded, but no longer + * is, fix this but don't consider it an error */ + if ((LINUX_S_ISDIR(inode->i_mode) && link_counted > 1 && + (inode->i_flags & EXT2_INDEX_FL) && + link_count == 1 && !(ctx->options & E2F_OPT_NO)) || + (fix_problem(ctx, PR_4_BAD_REF_COUNT, &pctx))) { inode->i_links_count = link_counted; e2fsck_write_inode(ctx, i, inode, "pass4"); } diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h index 6016b68b..48dd2866 100644 --- a/lib/ext2fs/ext2_fs.h +++ b/lib/ext2fs/ext2_fs.h @@ -632,6 +632,7 @@ struct ext2_super_block { #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ + EXT4_FEATURE_RO_COMPAT_DIR_NLINK| \ EXT2_FEATURE_RO_COMPAT_BTREE_DIR) /* diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h index 15f43526..d52fa345 100644 --- a/lib/ext2fs/ext2fs.h +++ b/lib/ext2fs/ext2fs.h @@ -516,7 +516,8 @@ typedef struct ext2_icount *ext2_icount_t; EXT4_FEATURE_INCOMPAT_FLEX_BG) #endif #define EXT2_LIB_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER|\ - EXT2_FEATURE_RO_COMPAT_LARGE_FILE) + EXT2_FEATURE_RO_COMPAT_LARGE_FILE|\ + EXT4_FEATURE_RO_COMPAT_DIR_NLINK) /* * These features are only allowed if EXT2_FLAG_SOFTSUPP_FEATURES is passed @@ -525,7 +526,6 @@ typedef struct ext2_icount *ext2_icount_t; #define EXT2_LIB_SOFTSUPP_INCOMPAT (EXT3_FEATURE_INCOMPAT_EXTENTS) #define EXT2_LIB_SOFTSUPP_RO_COMPAT (EXT4_FEATURE_RO_COMPAT_HUGE_FILE|\ EXT4_FEATURE_RO_COMPAT_GDT_CSUM|\ - EXT4_FEATURE_RO_COMPAT_DIR_NLINK|\ EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE) /*