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Message-ID: <20191230195218.GC125106@mit.edu>
Date: Mon, 30 Dec 2019 14:52:18 -0500
From: "Theodore Y. Ts'o" <tytso@....edu>
To: Andreas Dilger <adilger@...ger.ca>
Cc: Wang Shilong <wangshilong1991@...il.com>,
Ext4 Developers List <linux-ext4@...r.kernel.org>,
lixi@....com, dongyangli@....com, Wang Shilong <wshilong@....com>
Subject: Re: [PATCH] e2fsprogs: fix to use inode i_blocks correctly
On Mon, Dec 30, 2019 at 11:37:40AM -0700, Andreas Dilger wrote:
>
> No patch is attached?
Oops, here you go.
- Ted
commit c90cea86eeef89f29f7bd5535fbaa5809a812cc7
Author: Theodore Ts'o <tytso@....edu>
Date: Mon Dec 30 10:12:58 2019 -0500
ext2fs: add ext2fs_get_stat_i_blocks() function
The function ext2fs_inode_i_blocks() is a bit confusing whether it is
returning the inode's i_blocks value, or whether it is returning the
value ala the stat(2) system call, which returns i_blocks in units of
512 byte sectors. This caused ext2fs_inode_i_blocks() to be
incorrectly used in fuse2fs and the function quota_compute_usage().
To address this, we add a new function, ext2fs_get_stat_i_blocks()
which is clearly labelled what it is returning, and use it in fuse2fs
and quota_compute_usage(). It's also a bit more convenient to use it
in e2fsck, so use it there too.
Reported-by: Wang Shilong <wangshilong1991@...il.com>
Signed-off-by: Theodore Ts'o <tytso@....edu>
diff --git a/e2fsck/extents.c b/e2fsck/extents.c
index 3073725a..e9af1bbe 100644
--- a/e2fsck/extents.c
+++ b/e2fsck/extents.c
@@ -264,7 +264,7 @@ extents_loaded:
goto err;
ext_written = 0;
- start_val = ext2fs_inode_i_blocks(ctx->fs, EXT2_INODE(&inode));
+ start_val = ext2fs_get_stat_i_blocks(ctx->fs, EXT2_INODE(&inode));
for (i = 0, ex = list->extents; i < list->count; i++, ex++) {
memcpy(&extent, ex, sizeof(struct ext2fs_extent));
extent.e_flags &= EXT2_EXTENT_FLAGS_UNINIT;
@@ -302,15 +302,10 @@ extents_loaded:
ext_written++;
}
- delta = ext2fs_inode_i_blocks(ctx->fs, EXT2_INODE(&inode)) - start_val;
- if (delta) {
- if (!ext2fs_has_feature_huge_file(ctx->fs->super) ||
- !(inode.i_flags & EXT4_HUGE_FILE_FL))
- delta <<= 9;
- else
- delta *= ctx->fs->blocksize;
- quota_data_add(ctx->qctx, &inode, ino, delta);
- }
+ delta = ext2fs_get_stat_i_blocks(ctx->fs, EXT2_INODE(&inode)) -
+ start_val;
+ if (delta)
+ quota_data_add(ctx->qctx, &inode, ino, delta << 9);
#if defined(DEBUG) || defined(DEBUG_SUMMARY)
printf("rebuild: ino=%d extents=%d->%d\n", ino, list->ext_read,
diff --git a/lib/ext2fs/blknum.c b/lib/ext2fs/blknum.c
index 9ee5c66e..31055c34 100644
--- a/lib/ext2fs/blknum.c
+++ b/lib/ext2fs/blknum.c
@@ -85,6 +85,22 @@ blk64_t ext2fs_inode_i_blocks(ext2_filsys fs,
(__u64)inode->osd2.linux2.l_i_blocks_hi << 32 : 0));
}
+/*
+ * Return the inode i_blocks in stat (512 byte) units
+ */
+blk64_t ext2fs_get_stat_i_blocks(ext2_filsys fs,
+ struct ext2_inode *inode)
+{
+ blk64_t ret = inode->i_blocks;
+
+ if (ext2fs_has_feature_huge_file(fs->super)) {
+ ret += ((long long) inode->osd2.linux2.l_i_blocks_hi) << 32;
+ if (inode->i_flags & EXT4_HUGE_FILE_FL)
+ ret *= (fs->blocksize / 512);
+ }
+ return ret;
+}
+
/*
* Return the fs block count
*/
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 59fd9742..ca5e3321 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -908,7 +908,9 @@ extern int ext2fs_group_blocks_count(ext2_filsys fs, dgrp_t group);
extern blk64_t ext2fs_inode_data_blocks2(ext2_filsys fs,
struct ext2_inode *inode);
extern blk64_t ext2fs_inode_i_blocks(ext2_filsys fs,
- struct ext2_inode *inode);
+ struct ext2_inode *inode);
+extern blk64_t ext2fs_get_stat_i_blocks(ext2_filsys fs,
+ struct ext2_inode *inode);
extern blk64_t ext2fs_blocks_count(struct ext2_super_block *super);
extern void ext2fs_blocks_count_set(struct ext2_super_block *super,
blk64_t blk);
diff --git a/lib/support/mkquota.c b/lib/support/mkquota.c
index ddb53124..6f7ae6d6 100644
--- a/lib/support/mkquota.c
+++ b/lib/support/mkquota.c
@@ -503,8 +503,8 @@ errcode_t quota_compute_usage(quota_ctx_t qctx)
if (inode->i_links_count &&
(ino == EXT2_ROOT_INO ||
ino >= EXT2_FIRST_INODE(fs->super))) {
- space = ext2fs_inode_i_blocks(fs,
- EXT2_INODE(inode)) << 9;
+ space = ext2fs_get_stat_i_blocks(fs,
+ EXT2_INODE(inode)) << 9;
quota_data_add(qctx, inode, ino, space);
quota_data_inodes(qctx, inode, ino, +1);
}
diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index 94cd5f67..2cfc6af3 100644
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -754,23 +754,6 @@ static void *op_init(struct fuse_conn_info *conn)
return ff;
}
-static blkcnt_t blocks_from_inode(ext2_filsys fs,
- struct ext2_inode_large *inode)
-{
- blkcnt_t b;
-
- b = inode->i_blocks;
- if (ext2fs_has_feature_huge_file(fs->super))
- b += ((long long) inode->osd2.linux2.l_i_blocks_hi) << 32;
-
- if (!ext2fs_has_feature_huge_file(fs->super) ||
- !(inode->i_flags & EXT4_HUGE_FILE_FL))
- b *= fs->blocksize / 512;
- b *= EXT2FS_CLUSTER_RATIO(fs);
-
- return b;
-}
-
static int stat_inode(ext2_filsys fs, ext2_ino_t ino, struct stat *statbuf)
{
struct ext2_inode_large inode;
@@ -794,7 +777,7 @@ static int stat_inode(ext2_filsys fs, ext2_ino_t ino, struct stat *statbuf)
statbuf->st_gid = inode_gid(inode);
statbuf->st_size = EXT2_I_SIZE(&inode);
statbuf->st_blksize = fs->blocksize;
- statbuf->st_blocks = blocks_from_inode(fs, &inode);
+ statbuf->st_blocks = ext2fs_get_stat_i_blocks(fs, &inode);
EXT4_INODE_GET_XTIME(i_atime, &tv, &inode);
statbuf->st_atime = tv.tv_sec;
EXT4_INODE_GET_XTIME(i_mtime, &tv, &inode);
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