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SubjectRe: [PATCH v2] ext3: Add journal error check into ext3_rename()
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On Tue, Nov 23, 2010 at 6:30 AM, Namhyung Kim <namhyung@gmail.com> wrote:
> Check return value of ext3_journal_get_write_access() and
> ext3_journal_dirty_metadata().
>
> Signed-off-by: Namhyung Kim <namhyung@gmail.com>
> ---
>  fs/ext3/namei.c |   19 +++++++++++++++----
>  1 files changed, 15 insertions(+), 4 deletions(-)
>
> diff --git a/fs/ext3/namei.c b/fs/ext3/namei.c
> index 672cea1..c8415e7 100644
> --- a/fs/ext3/namei.c
> +++ b/fs/ext3/namei.c
> @@ -2371,7 +2371,9 @@ static int ext3_rename (struct inode * old_dir, struct dentry *old_dentry,
>                        goto end_rename;
>        } else {
>                BUFFER_TRACE(new_bh, "get write access");
> -               ext3_journal_get_write_access(handle, new_bh);
> +               retval = ext3_journal_get_write_access(handle, new_bh);
> +               if (retval)
> +                       goto journal_error;
>                new_de->inode = cpu_to_le32(old_inode->i_ino);
>                if (EXT3_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
>                                              EXT3_FEATURE_INCOMPAT_FILETYPE))
> @@ -2380,7 +2382,9 @@ static int ext3_rename (struct inode * old_dir, struct dentry *old_dentry,
>                new_dir->i_ctime = new_dir->i_mtime = CURRENT_TIME_SEC;
>                ext3_mark_inode_dirty(handle, new_dir);
>                BUFFER_TRACE(new_bh, "call ext3_journal_dirty_metadata");
> -               ext3_journal_dirty_metadata(handle, new_bh);
> +               retval = ext3_journal_dirty_metadata(handle, new_bh);
> +               if (retval)
> +                       goto journal_error;
>                brelse(new_bh);
>                new_bh = NULL;
>        }
> @@ -2429,10 +2433,17 @@ static int ext3_rename (struct inode * old_dir, struct dentry *old_dentry,
>        ext3_update_dx_flag(old_dir);
>        if (dir_bh) {
>                BUFFER_TRACE(dir_bh, "get_write_access");
> -               ext3_journal_get_write_access(handle, dir_bh);
> +               retval = ext3_journal_get_write_access(handle, dir_bh);
> +               if (retval)
> +                       goto journal_error;
>                PARENT_INO(dir_bh->b_data) = cpu_to_le32(new_dir->i_ino);
>                BUFFER_TRACE(dir_bh, "call ext3_journal_dirty_metadata");
> -               ext3_journal_dirty_metadata(handle, dir_bh);
> +               retval = ext3_journal_dirty_metadata(handle, dir_bh);
> +               if (retval) {
> +journal_error:
> +                       ext3_std_error(new_dir->i_sb, retval);
> +                       goto end_rename;
> +               }


Hi Kim,

A better way to handle this situation is to get_write_access much sooner,
when things can still be rolled back properly.
Please find below a patch I am using in next3 to fix some un-handled
journal errors
and see if you can/want to use any of it as reference for your patches.

Amir.


Some places in Ext3 original code don't check for return value of
JBD functions. Check for snapshot/journal errors in those places.

Signed-off-by: Amir Goldstein <amir73il@users.sf.net>

--------------------------------------------------------------------------------
diff -Nuarp a/fs/ext3/balloc.c b/fs/ext3/balloc.c
--- a/fs/ext3/balloc.c 2010-11-23 09:38:13.395922811 +0200
+++ b/fs/ext3/balloc.c 2010-11-23 09:38:13.185923236 +0200
@@ -674,7 +674,9 @@ do_more:

/* We dirtied the bitmap block */
BUFFER_TRACE(bitmap_bh, "dirtied bitmap block");
- err = ext3_journal_dirty_metadata(handle, bitmap_bh);
+ ret = ext3_journal_dirty_metadata(handle, bitmap_bh);
+ if (!err)
+ err = ret;

/* And the group descriptor block */
BUFFER_TRACE(gd_bh, "dirtied group descriptor block");
diff -Nuarp a/fs/ext3/inode.c b/fs/ext3/inode.c
--- a/fs/ext3/inode.c 2010-11-23 09:38:13.405923214 +0200
+++ b/fs/ext3/inode.c 2010-11-23 09:38:13.195922747 +0200
@@ -2362,6 +2362,9 @@ static void ext3_clear_blocks(handle_t
if (bh) {
BUFFER_TRACE(bh, "retaking write access");
ext3_journal_get_write_access_inode(handle, inode, bh);
+ /* we may have lost write_access on bh */
+ if (is_handle_aborted(handle))
+ return;
}
}

@@ -2444,6 +2447,9 @@ static void ext3_free_data(handle_t *ha
ext3_clear_blocks(handle, inode, this_bh,
block_to_free,
count, block_to_free_p, p);
+ /* we may have lost write_access on this_bh */
+ if (is_handle_aborted(handle))
+ return;
block_to_free = nr;
block_to_free_p = p;
count = 1;
@@ -2454,6 +2460,9 @@ static void ext3_free_data(handle_t *ha
if (count > 0)
ext3_clear_blocks(handle, inode, this_bh, block_to_free,
count, block_to_free_p, p);
+ /* we may have lost write_access on this_bh */
+ if (is_handle_aborted(handle))
+ return;

if (this_bh) {
BUFFER_TRACE(this_bh, "call ext3_journal_dirty_metadata");
diff -Nuarp a/fs/ext3/namei.c b/fs/ext3/namei.c
--- a/fs/ext3/namei.c 2010-11-23 09:38:13.415922664 +0200
+++ b/fs/ext3/namei.c 2010-11-23 09:38:13.205923227 +0200
@@ -1649,8 +1649,12 @@ static int ext3_delete_entry (handle_t
if (!ext3_check_dir_entry("ext3_delete_entry", dir, de, bh, i))
return -EIO;
if (de == de_del) {
+ int err;
+
BUFFER_TRACE(bh, "get_write_access");
- ext3_journal_get_write_access(handle, bh);
+ err = ext3_journal_get_write_access(handle, bh);
+ if (err)
+ return err;
if (pde)
pde->rec_len = ext3_rec_len_to_disk(
ext3_rec_len_from_disk(pde->rec_len) +
@@ -1797,7 +1801,16 @@ retry:
goto out_stop;
}
BUFFER_TRACE(dir_block, "get_write_access");
- ext3_journal_get_write_access(handle, dir_block);
+ err = ext3_journal_get_write_access(handle, dir_block);
+ if (err) {
+ drop_nlink(inode); /* is this nlink == 0? */
+ unlock_new_inode(inode);
+ /* no need to check for errors - we failed anyway */
+ (void) ext3_mark_inode_dirty(handle, inode);
+ iput(inode);
+ brelse(dir_block);
+ goto out_stop;
+ }
de = (struct ext3_dir_entry_2 *) dir_block->b_data;
de->inode = cpu_to_le32(inode->i_ino);
de->name_len = 1;
@@ -2337,6 +2350,10 @@ static int ext3_rename (struct inode *
if (!new_inode && new_dir!=old_dir &&
new_dir->i_nlink >= EXT3_LINK_MAX)
goto end_rename;
+ BUFFER_TRACE(dir_bh, "get_write_access");
+ retval = ext3_journal_get_write_access(handle, dir_bh);
+ if (retval)
+ goto end_rename;
}
if (!new_bh) {
retval = ext3_add_entry (handle, new_dentry, old_inode);
@@ -2344,7 +2361,9 @@ static int ext3_rename (struct inode *
goto end_rename;
} else {
BUFFER_TRACE(new_bh, "get write access");
- ext3_journal_get_write_access(handle, new_bh);
+ retval = ext3_journal_get_write_access(handle, new_bh);
+ if (retval)
+ goto end_rename;
new_de->inode = cpu_to_le32(old_inode->i_ino);
if (EXT3_HAS_INCOMPAT_FEATURE(new_dir->i_sb,
EXT3_FEATURE_INCOMPAT_FILETYPE))
@@ -2401,8 +2420,6 @@ static int ext3_rename (struct inode *
old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME_SEC;
ext3_update_dx_flag(old_dir);
if (dir_bh) {
- BUFFER_TRACE(dir_bh, "get_write_access");
- ext3_journal_get_write_access(handle, dir_bh);
PARENT_INO(dir_bh->b_data) = cpu_to_le32(new_dir->i_ino);
BUFFER_TRACE(dir_bh, "call ext3_journal_dirty_metadata");
ext3_journal_dirty_metadata(handle, dir_bh);
--
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