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Date: Sat, 12 Oct 2013 15:22:38 +0800
From: Zheng Liu <gnehzuil.liu@...il.com>
To: "Darrick J. Wong" <darrick.wong@...cle.com>
Cc: linux-ext4@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
Zheng Liu <wenqing.lz@...bao.com>
Subject: Re: [PATCH v1 12/22] debugfs: handle inline_data in punch command
Good catch! I will fix these problems.
Thanks,
- Zheng
On Fri, Oct 11, 2013 at 05:37:00PM -0700, Darrick J. Wong wrote:
> On Fri, Aug 02, 2013 at 05:49:39PM +0800, Zheng Liu wrote:
> > From: Zheng Liu <wenqing.lz@...bao.com>
> >
> > Now punch command only can truncate an inode with inline_data. The
> > start block must be 0 because the size of an inode shouldn't be greater
> > than one block.
> >
> > Signed-off-by: Theodore Ts'o <tytso@....edu>
> > Signed-off-by: Zheng Liu <wenqing.lz@...bao.com>
> > ---
> > lib/ext2fs/ext2fsP.h | 3 +++
> > lib/ext2fs/inline_data.c | 9 +++----
> > lib/ext2fs/punch.c | 59 ++++++++++++++++++++++++++++++++++++++++++++--
> > 3 files changed, 63 insertions(+), 8 deletions(-)
> >
> > diff --git a/lib/ext2fs/ext2fsP.h b/lib/ext2fs/ext2fsP.h
> > index ed89272..1e5aa32 100644
> > --- a/lib/ext2fs/ext2fsP.h
> > +++ b/lib/ext2fs/ext2fsP.h
> > @@ -110,6 +110,9 @@ extern errcode_t ext2fs_inline_data_find(ext2_filsys fs,
> > struct inline_data *data);
> > extern errcode_t ext2fs_inline_data_convert(ext2_filsys fs, ext2_ino_t ino,
> > void *priv_data);
> > +extern errcode_t ext2fs_inline_data_destory_data(ext2_filsys fs, ext2_ino_t ino,
>
> "destroy", not "destory" ?
>
> > + struct ext2_inode_large *inode,
> > + struct inline_data *data);
> >
> > /* Generic numeric progress meter */
> >
> > diff --git a/lib/ext2fs/inline_data.c b/lib/ext2fs/inline_data.c
> > index 5ca95ee..52ac133 100644
> > --- a/lib/ext2fs/inline_data.c
> > +++ b/lib/ext2fs/inline_data.c
> > @@ -28,9 +28,6 @@ static void ext2fs_inline_data_finish_convert(ext2_filsys fs, ext2_ino_t ino,
> > int inline_size);
> > static void ext2fs_update_final_de(ext2_filsys fs, char *de_buf,
> > int old_size, int new_size);
> > -static errcode_t ext2fs_inline_data_destory_data(ext2_filsys fs, ext2_ino_t ino,
> > - struct ext2_inode_large *inode,
> > - struct inline_data *data);
> >
> > errcode_t ext2fs_inline_data_find(ext2_filsys fs,
> > struct ext2_inode_large *inode,
> > @@ -78,9 +75,9 @@ static void *ext2fs_get_inline_xattr_pos(struct ext2_inode_large *inode,
> > return (void *) (IFIRST(header) + entry->e_value_offs);
> > }
> >
> > -static errcode_t ext2fs_inline_data_destory_data(ext2_filsys fs, ext2_ino_t ino,
> > - struct ext2_inode_large *inode,
> > - struct inline_data *data)
> > +errcode_t ext2fs_inline_data_destory_data(ext2_filsys fs, ext2_ino_t ino,
> > + struct ext2_inode_large *inode,
> > + struct inline_data *data)
> > {
> > struct ext2_ext_attr_ibody_header *header;
> > struct ext2_ext_attr_search s = {
> > diff --git a/lib/ext2fs/punch.c b/lib/ext2fs/punch.c
> > index b53653a..3bfbd4d 100644
> > --- a/lib/ext2fs/punch.c
> > +++ b/lib/ext2fs/punch.c
> > @@ -19,6 +19,7 @@
> >
> > #include "ext2_fs.h"
> > #include "ext2fs.h"
> > +#include "ext2fsP.h"
> >
> > #undef PUNCH_DEBUG
> >
> > @@ -281,7 +282,59 @@ errout:
> > ext2fs_extent_free(handle);
> > return retval;
> > }
> > -
> > +
> > +static errcode_t ext2fs_punch_inline_data(ext2_filsys fs, ext2_ino_t ino,
> > + blk64_t start, blk64_t end)
> > +{
> > + struct ext2_inode_large *inode;
> > + struct inline_data data;
> > + errcode_t retval;
> > +
> > + /*
> > + * 'start' must be 0 because here it's a block and the size of
> > + * an inode shouldn't greater than a block.
> > + */
> > + if (start != 0)
> > + return 0;
> > +
> > + /* Punching hole for inline_data is not supported */
> > + if ((unsigned int)end != ~0U)
> > + return EXT2_ET_OP_NOT_SUPPORTED;
>
> Um... shouldn't this be ~0ULL since end is blk64_t?
>
> For an inline_data file I doubt it matters, but ripping off high bits looks
> suspicious to me.
>
> --D
>
> > +
> > + retval = ext2fs_get_mem(EXT2_INODE_SIZE(fs->super), &inode);
> > + if (retval)
> > + return retval;
> > +
> > + retval = ext2fs_read_inode_full(fs, ino, (void *)inode,
> > + EXT2_INODE_SIZE(fs->super));
> > + if (retval)
> > + goto out;
> > +
> > + retval = ext2fs_inline_data_find(fs, inode, &data);
> > + if (retval)
> > + goto out;
> > +
> > + if (!data.inline_off)
> > + goto out;
> > +
> > + if (inode->i_extra_isize > (EXT2_INODE_SIZE(fs->super) -
> > + EXT2_GOOD_OLD_INODE_SIZE)) {
> > + retval = EXT2_ET_BAD_EXTRA_SIZE;
> > + goto out;
> > + }
> > +
> > + retval = ext2fs_inline_data_destory_data(fs, ino, inode, &data);
> > + if (retval)
> > + goto out;
> > +
> > + inode->i_size = 0;
> > + retval = ext2fs_write_inode_full(fs, ino, (void *)inode,
> > + EXT2_INODE_SIZE(fs->super));
> > +out:
> > + ext2fs_free_mem(&inode);
> > + return retval;
> > +}
> > +
> > /*
> > * Deallocate all logical blocks starting at start to end, inclusive.
> > * If end is ~0, then this is effectively truncate.
> > @@ -307,7 +360,9 @@ extern errcode_t ext2fs_punch(ext2_filsys fs, ext2_ino_t ino,
> > return retval;
> > inode = &inode_buf;
> > }
> > - if (inode->i_flags & EXT4_EXTENTS_FL)
> > + if (inode->i_flags & EXT4_INLINE_DATA_FL)
> > + return ext2fs_punch_inline_data(fs, ino, start, end);
> > + else if (inode->i_flags & EXT4_EXTENTS_FL)
> > retval = ext2fs_punch_extent(fs, ino, inode, start, end);
> > else {
> > blk_t count;
> > --
> > 1.7.9.7
> >
> > --
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