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xfs: introduce XFS_MAX_FILEOFF 

Introduce a new #define for the maximum supported file block offset.
We'll use this in the next patch to make it more obvious that we're
doing some operation for all possible inode fork mappings after a given
offset.  We can't use ULLONG_MAX here because bunmapi uses that to
detect when it's done.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2020-01-02 13:25:00 -08:00
parent 7cb41b1d14
commit a508486552
2 changed files with 9 additions and 1 deletions
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7
fs/xfs/libxfs/xfs_format.h
View File

@ -1540,6 +1540,13 @@ typedef struct xfs_bmdr_block {
#define BMBT_BLOCKCOUNT_BITLEN 21
#define BMBT_STARTOFF_MASK ((1ULL << BMBT_STARTOFF_BITLEN) - 1)
#define BMBT_BLOCKCOUNT_MASK ((1ULL << BMBT_BLOCKCOUNT_BITLEN) - 1)
/*
* bmbt records have a file offset (block) field that is 54 bits wide, so this
* is the largest xfs_fileoff_t that we ever expect to see.
*/
#define XFS_MAX_FILEOFF (BMBT_STARTOFF_MASK + BMBT_BLOCKCOUNT_MASK)
typedef struct xfs_bmbt_rec {
__be64 l0, l1;

3
fs/xfs/xfs_reflink.c
View File

@ -1457,7 +1457,8 @@ xfs_reflink_clear_inode_flag(
* We didn't find any shared blocks so turn off the reflink flag.
* First, get rid of any leftover CoW mappings.
*/
error = xfs_reflink_cancel_cow_blocks(ip, tpp, 0, NULLFILEOFF, true);
error = xfs_reflink_cancel_cow_blocks(ip, tpp, 0, XFS_MAX_FILEOFF,
true);
if (error)
return error;