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mm/fadvise: use LLONG_MAX instead of -1 for eof

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generic_fadvise() sets endbyte = -1 to specify end of file (i.e.  if
length == 0 is passed from userspace).  Most other callers to
filemap_fdatawrite_range() use LLONG_MAX for this purpose, particularly if
they also call fdatawait_range() (which requires end >= start).  For
example, sync_file_range(), vfs_fsync() (where the range is passed down
through per-fs ->fsync() callbacks), filemap_flush(), etc. 
generic_fadvise() does not currently wait on writeback, but fix the call
up to be consistent with other callers.

Link: https://lkml.kernel.org/r/20221128155632.3950447-3-bfoster@redhat.com
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Brian Foster 2022-11-28 10:56:32 -05:00 committed by Andrew Morton
parent feeb9b2695
commit 3cd629e577
1 changed files with 1 additions and 1 deletions
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2
mm/fadvise.c
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@ -72,7 +72,7 @@ int generic_fadvise(struct file *file, loff_t offset, loff_t len, int advice)
*/
endbyte = (u64)offset + (u64)len;
if (!len || endbyte < len)
endbyte = -1;
endbyte = LLONG_MAX;
else
endbyte--; /* inclusive */