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xfs: spilt xfs_dialloc() into 2 functions

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This patch explicitly separates free inode chunk allocation and
inode allocation into two individual high level operations.

Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Dave Chinner
2020-12-09 10:05:16 -08:00
committed by Darrick J. Wong
parent f3bf6e0f11
commit 8d822dc38a
3 changed files with 48 additions and 37 deletions
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20
fs/xfs/libxfs/xfs_ialloc.h
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@ -37,16 +37,26 @@ xfs_make_iptr(struct xfs_mount *mp, struct xfs_buf *b, int o)
* Mode is used to tell whether the new inode will need space, and whether
* it is a directory.
*
* Once we successfully pick an inode its number is returned and the
* on-disk data structures are updated. The inode itself is not read
* in, since doing so would break ordering constraints with xfs_reclaim.
* There are two phases to inode allocation: selecting an AG and ensuring
* that it contains free inodes, followed by allocating one of the free
* inodes. xfs_dialloc_select_ag() does the former and returns a locked AGI
* to the caller, ensuring that followup call to xfs_dialloc_ag() will
* have free inodes to allocate from. xfs_dialloc_ag() will return the inode
* number of the free inode we allocated.
*/
int /* error */
xfs_dialloc(
xfs_dialloc_select_ag(
struct xfs_trans **tpp, /* double pointer of transaction */
xfs_ino_t parent, /* parent inode (directory) */
umode_t mode, /* mode bits for new inode */
xfs_ino_t *inop); /* inode number allocated */
struct xfs_buf **IO_agbp);
int
xfs_dialloc_ag(
struct xfs_trans *tp,
struct xfs_buf *agbp,
xfs_ino_t parent,
xfs_ino_t *inop);
/*
* Free disk inode. Carefully avoids touching the incore inode, all