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Subject[PATCH 18/25] elevate writer count for do_sys_truncate()
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Date


Acked-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
---
lxc-dave/fs/open.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff -puN fs/open.c~elevate-writer-count-for-do-sys-truncate fs/open.c
--- lxc/fs/open.c~elevate-writer-count-for-do-sys-truncate 2007-09-20 12:16:19.000000000 -0700
+++ lxc-dave/fs/open.c 2007-09-20 12:16:19.000000000 -0700
@@ -244,21 +244,21 @@ static long do_sys_truncate(const char _
if (!S_ISREG(inode->i_mode))
goto dput_and_out;

- error = vfs_permission(&nd, MAY_WRITE);
+ error = mnt_want_write(nd.mnt);
if (error)
goto dput_and_out;

- error = -EROFS;
- if (IS_RDONLY(inode))
- goto dput_and_out;
+ error = vfs_permission(&nd, MAY_WRITE);
+ if (error)
+ goto mnt_drop_write_and_out;

error = -EPERM;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
- goto dput_and_out;
+ goto mnt_drop_write_and_out;

error = get_write_access(inode);
if (error)
- goto dput_and_out;
+ goto mnt_drop_write_and_out;

/*
* Make sure that there are no leases. get_write_access() protects
@@ -276,6 +276,8 @@ static long do_sys_truncate(const char _

put_write_and_out:
put_write_access(inode);
+mnt_drop_write_and_out:
+ mnt_drop_write(nd.mnt);
dput_and_out:
path_release(&nd);
out:
_
-
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