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Message-ID: <20150514002206.10785.3251.stgit@birch.djwong.org>
Date: Wed, 13 May 2015 17:22:06 -0700
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: tytso@....edu, darrick.wong@...cle.com
Cc: linux-ext4@...r.kernel.org
Subject: [PATCH 09/14] libext2fs: add new hooks to support large allocations
Add a new get_alloc_blocks hook and a block_alloc_stats_range hook so
that e2fsck can capture allocation requests spanning more than a
block to its block_found_map.
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
e2fsck/pass1.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
lib/ext2fs/alloc.c | 37 ++++++++++++++++++++++++++++++++++++-
lib/ext2fs/alloc_stats.c | 16 ++++++++++++++++
lib/ext2fs/ext2fs.h | 16 ++++++++++++++++
4 files changed, 113 insertions(+), 1 deletion(-)
diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
index e87643a..3777e42 100644
--- a/e2fsck/pass1.c
+++ b/e2fsck/pass1.c
@@ -3934,6 +3934,26 @@ static errcode_t e2fsck_get_alloc_block(ext2_filsys fs, blk64_t goal,
return (0);
}
+static errcode_t e2fsck_new_range(ext2_filsys fs, int flags, blk64_t goal,
+ blk64_t len, blk64_t *pblk, blk64_t *plen)
+{
+ e2fsck_t ctx = (e2fsck_t) fs->priv_data;
+ errcode_t retval;
+
+ if (ctx->block_found_map)
+ return ext2fs_new_range(fs, flags, goal, len,
+ ctx->block_found_map, pblk, plen);
+
+ if (!fs->block_map) {
+ retval = ext2fs_read_block_bitmap(fs);
+ if (retval)
+ return retval;
+ }
+
+ return ext2fs_new_range(fs, flags, goal, len, fs->block_map,
+ pblk, plen);
+}
+
static void e2fsck_block_alloc_stats(ext2_filsys fs, blk64_t blk, int inuse)
{
e2fsck_t ctx = (e2fsck_t) fs->priv_data;
@@ -3953,6 +3973,28 @@ static void e2fsck_block_alloc_stats(ext2_filsys fs, blk64_t blk, int inuse)
}
}
+static void e2fsck_block_alloc_stats_range(ext2_filsys fs, blk64_t blk,
+ blk_t num, int inuse)
+{
+ e2fsck_t ctx = (e2fsck_t) fs->priv_data;
+
+ /* Never free a critical metadata block */
+ if (ctx->block_found_map &&
+ ctx->block_metadata_map &&
+ inuse < 0 &&
+ ext2fs_test_block_bitmap_range2(ctx->block_metadata_map, blk, num))
+ return;
+
+ if (ctx->block_found_map) {
+ if (inuse > 0)
+ ext2fs_mark_block_bitmap_range2(ctx->block_found_map,
+ blk, num);
+ else
+ ext2fs_unmark_block_bitmap_range2(ctx->block_found_map,
+ blk, num);
+ }
+}
+
void e2fsck_use_inode_shortcuts(e2fsck_t ctx, int use_shortcuts)
{
ext2_filsys fs = ctx->fs;
@@ -3976,4 +4018,7 @@ void e2fsck_intercept_block_allocations(e2fsck_t ctx)
ext2fs_set_alloc_block_callback(ctx->fs, e2fsck_get_alloc_block, 0);
ext2fs_set_block_alloc_stats_callback(ctx->fs,
e2fsck_block_alloc_stats, 0);
+ ext2fs_set_new_range_callback(ctx->fs, e2fsck_new_range, NULL);
+ ext2fs_set_block_alloc_stats_range_callback(ctx->fs,
+ e2fsck_block_alloc_stats_range, NULL);
}
diff --git a/lib/ext2fs/alloc.c b/lib/ext2fs/alloc.c
index 4c3b620..86e7f99 100644
--- a/lib/ext2fs/alloc.c
+++ b/lib/ext2fs/alloc.c
@@ -379,12 +379,32 @@ errcode_t ext2fs_new_range(ext2_filsys fs, int flags, blk64_t goal,
blk64_t start, end, b;
int looped = 0;
blk64_t max_blocks = ext2fs_blocks_count(fs->super);
+ errcode_t (*nrf)(ext2_filsys fs, int flags, blk64_t goal,
+ blk64_t len, blk64_t *pblk, blk64_t *plen);
dbg_printf("%s: flags=0x%x goal=%llu len=%llu\n", __func__, flags,
goal, len);
EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
if (len == 0 || (flags & ~EXT2_NEWRANGE_ALL_FLAGS))
return EXT2_ET_INVALID_ARGUMENT;
+
+ if (!map && fs->new_range) {
+ /*
+ * In case there are clients out there whose new_range
+ * handlers call ext2fs_new_range with a NULL block map,
+ * temporarily swap out the function pointer so that we don't
+ * end up in an infinite loop.
+ */
+ nrf = fs->new_range;
+ fs->new_range = NULL;
+ retval = nrf(fs, flags, goal, len, pblk, plen);
+ fs->new_range = nrf;
+ if (retval)
+ return retval;
+ start = *pblk;
+ end = *pblk + *plen;
+ goto allocated;
+ }
if (!map)
map = fs->block_map;
if (!map)
@@ -432,7 +452,7 @@ errcode_t ext2fs_new_range(ext2_filsys fs, int flags, blk64_t goal,
"blk=%llu--%llu %llu\n",
__func__, goal, goal + len - 1,
*pblk, *pblk + *plen - 1, *plen);
-
+allocated:
for (b = start; b < end;
b += fs->super->s_blocks_per_group)
clear_block_uninit(fs,
@@ -457,6 +477,21 @@ errout:
return retval;
}
+void ext2fs_set_new_range_callback(ext2_filsys fs,
+ errcode_t (*func)(ext2_filsys fs, int flags, blk64_t goal,
+ blk64_t len, blk64_t *pblk, blk64_t *plen),
+ errcode_t (**old)(ext2_filsys fs, int flags, blk64_t goal,
+ blk64_t len, blk64_t *pblk, blk64_t *plen))
+{
+ if (!fs || fs->magic != EXT2_ET_MAGIC_EXT2FS_FILSYS)
+ return;
+
+ if (old)
+ *old = fs->new_range;
+
+ fs->new_range = func;
+}
+
errcode_t ext2fs_alloc_range(ext2_filsys fs, int flags, blk64_t goal,
blk_t len, blk64_t *ret)
{
diff --git a/lib/ext2fs/alloc_stats.c b/lib/ext2fs/alloc_stats.c
index aca5004..3949f61 100644
--- a/lib/ext2fs/alloc_stats.c
+++ b/lib/ext2fs/alloc_stats.c
@@ -145,4 +145,20 @@ void ext2fs_block_alloc_stats_range(ext2_filsys fs, blk64_t blk,
}
ext2fs_mark_super_dirty(fs);
ext2fs_mark_bb_dirty(fs);
+ if (fs->block_alloc_stats_range)
+ (fs->block_alloc_stats_range)(fs, blk, num, inuse);
+}
+
+void ext2fs_set_block_alloc_stats_range_callback(ext2_filsys fs,
+ void (*func)(ext2_filsys fs, blk64_t blk,
+ blk_t num, int inuse),
+ void (**old)(ext2_filsys fs, blk64_t blk,
+ blk_t num, int inuse))
+{
+ if (!fs || fs->magic != EXT2_ET_MAGIC_EXT2FS_FILSYS)
+ return;
+ if (old)
+ *old = fs->block_alloc_stats_range;
+
+ fs->block_alloc_stats_range = func;
}
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 613f0d1..9655cd8 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -279,6 +279,12 @@ struct struct_ext2_filsys {
io_channel journal_io;
char *journal_name;
+
+ /* New block range allocation hooks */
+ errcode_t (*new_range)(ext2_filsys fs, int flags, blk64_t goal,
+ blk64_t len, blk64_t *pblk, blk64_t *plen);
+ void (*block_alloc_stats_range)(ext2_filsys fs, blk64_t blk, blk_t num,
+ int inuse);
};
#if EXT2_FLAT_INCLUDES
@@ -674,6 +680,16 @@ extern void ext2fs_set_alloc_block_callback(ext2_filsys fs,
blk64_t *ret));
blk64_t ext2fs_find_inode_goal(ext2_filsys fs, ext2_ino_t ino,
struct ext2_inode *inode, blk64_t lblk);
+extern void ext2fs_set_new_range_callback(ext2_filsys fs,
+ errcode_t (*func)(ext2_filsys fs, int flags, blk64_t goal,
+ blk64_t len, blk64_t *pblk, blk64_t *plen),
+ errcode_t (**old)(ext2_filsys fs, int flags, blk64_t goal,
+ blk64_t len, blk64_t *pblk, blk64_t *plen));
+extern void ext2fs_set_block_alloc_stats_range_callback(ext2_filsys fs,
+ void (*func)(ext2_filsys fs, blk64_t blk,
+ blk_t num, int inuse),
+ void (**old)(ext2_filsys fs, blk64_t blk,
+ blk_t num, int inuse));
#define EXT2_NEWRANGE_FIXED_GOAL (0x1)
#define EXT2_NEWRANGE_MIN_LENGTH (0x2)
#define EXT2_NEWRANGE_ALL_FLAGS (0x3)
--
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