I've updated the patch below to use drop_inode rather than put_inode.
drop_inode is only called when the last iput() reference to the inode is
released, where put_inode is called for every iput().
Rich
On Wed, 13 Jun 2007 15:48:03 -0500
Rich Coe <[email protected]> wrote:
> Hi Linus,
>
> This patch fixes directory and missing files corruption in fs/udf which
> occurs on all known 2.6 releases.
>
> The corruption occurs because blocks which were pre-alloc'd for a directory
> are released back to the fs freelist, but the inode's alloc block information
> is not updated to reflect this.
>
> You would not see corruption if the number of files in any directory is
> less than 41, because the pre-alloc routine does not allocate blocks for the
> directory until the number of files is over 40.
>
> The problem occurs during unmounting because fs/udf incorrectly calls
> udf_discard_prealloc() from udf_clear_inode(). udf_discard_prealloc() will
> update the inode and schedule it for write, but no write will ever occur
> because the fs is in the process of being umount'd.
>
> The solution is to add a put_inode routine to update the inode contents
> and release the pre-alloc'd blocks to disk prior to clearing the inode
> from the kernel.
>
> Test case:
> mkuddfs /dev/scd0
> mount -o sync /dev/scd0 /mnt/cdrom
> mkdir /mnt/cdrom/A /mnt/cdrom/B
> cp A/* /mnt/cdrom/A [ A contains 90 files of various sizes ]
> cp B/* /mnt/cdrom/B [ B contains 20 or fewer files ]
> umount /mnt/cdrom
>
> Here you can see how 7 blocks starting at sector 139 are free and listed in the
> directory entry for 'A'. I used udfdump to get the following information:
> [ ... ]
> Free space found on this partition
> [00000139 - 00000159] [00000161 - 00000191] [00000193 - 00000223]
> [00004464 - 00004475] [00004485 - 00524286] [00524287 - 01048573]
> [01048574 - 01572860] [01572861 - 02097147] [02097148 - 02235039]
> [ ... ]
> Filename `A`
> [ ... ]
> [ blob at sector 2038 for 2048 bytes in logical partion 0 ]
> [ blob at sector 137 for 4096 bytes in logical partion 0 ]
> [ blob at sector 139 for 14336 bytes in logical partion 0 flags 1 ]
>
> --
> Rich Coe [email protected]
> Virtual Principle Engineer General Electric Healthcare Technologies
> Global Software Platforms, Computer Technology Team
Signed-off-by: Rich Coe <[email protected]>
---
diff -urNp linux-2.6.20.orig/fs/udf/inode.c linux-2.6.20/fs/udf/inode.c
--- linux-2.6.20.orig/fs/udf/inode.c 2007-02-04 12:44:54.000000000 -0600
+++ linux-2.6.20/fs/udf/inode.c 2007-06-13 11:32:41.930983471 -0500
@@ -102,14 +102,17 @@ no_delete:
void udf_clear_inode(struct inode *inode)
{
+ kfree(UDF_I_DATA(inode));
+ UDF_I_DATA(inode) = NULL;
+}
+
+void udf_put_inode(struct inode *inode)
+{
if (!(inode->i_sb->s_flags & MS_RDONLY)) {
lock_kernel();
udf_discard_prealloc(inode);
unlock_kernel();
}
-
- kfree(UDF_I_DATA(inode));
- UDF_I_DATA(inode) = NULL;
}
static int udf_writepage(struct page *page, struct writeback_control *wbc)
diff -urNp linux-2.6.20.orig/fs/udf/super.c linux-2.6.20/fs/udf/super.c
--- linux-2.6.20.orig/fs/udf/super.c 2007-02-04 12:44:54.000000000 -0600
+++ linux-2.6.20/fs/udf/super.c 2007-06-13 11:31:23.793017185 -0500
@@ -166,6 +166,7 @@ static struct super_operations udf_sb_op
.write_inode = udf_write_inode,
.delete_inode = udf_delete_inode,
.clear_inode = udf_clear_inode,
+ .drop_inode = udf_put_inode,
.put_super = udf_put_super,
.write_super = udf_write_super,
.statfs = udf_statfs,
diff -urNp linux-2.6.20.orig/fs/udf/udfdecl.h linux-2.6.20/fs/udf/udfdecl.h
--- linux-2.6.20.orig/fs/udf/udfdecl.h 2007-02-04 12:44:54.000000000 -0600
+++ linux-2.6.20/fs/udf/udfdecl.h 2007-06-13 11:31:16.684293910 -0500
@@ -97,6 +97,7 @@ extern void udf_truncate(struct inode *)
extern void udf_read_inode(struct inode *);
extern void udf_delete_inode(struct inode *);
extern void udf_clear_inode(struct inode *);
+extern void udf_put_inode(struct inode *);
extern int udf_write_inode(struct inode *, int);
extern long udf_block_map(struct inode *, long);
extern int8_t inode_bmap(struct inode *, int, kernel_lb_addr *, uint32_t *, kernel_lb_addr *, uint32_t *, uint32_t *, struct buffer_head **);
-
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