On 07/05/2016 10:37 AM, Theodore Ts'o wrote:
On Tue, Jul 05, 2016 at 09:42:13AM -0400, Josef Bacik wrote:
diff --git a/fs/coredump.c b/fs/coredump.c
index 281b768000e6..9da7357773f0 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -741,8 +741,10 @@ void do_coredump(const siginfo_t *siginfo)
goto close_fail;
if (!(cprm.file->f_mode & FMODE_CAN_WRITE))
goto close_fail;
- if (do_truncate(cprm.file->f_path.dentry, 0, 0, cprm.file))
- goto close_fail;
+ if (i_size_read(file_inode(cprm.file)) != 0) {
+ if (do_truncate(cprm.file->f_path.dentry, 0, 0, cprm.file))
+ goto close_fail;
+ }
}
/* get us an unshared descriptor table; almost always a no-op */
Omar, this probably breaks the case where we do
fallocate(FALLOC_FL_KEEP_SIZE), the i_size will be 0 but there will be
blocks to truncate. Probably want to check i_blocks or something. Thanks,
Sure, but this is in the coredump code; do we care there? What are
the odds that someone will have fallocated blocks beyond i_size in a
file named "core"? And if so, it's not like it's going to make the
coredump invalid or non-useful in any way.
Wow I totally didn't notice this was in coredump.c, I thought it was in ext4
code because you said it failed regression tests, which I assumed were your ext4
tests. Ignore me. Thanks,
Josef
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