forked from luck/tmp_suning_uos_patched
6552321831
This patch drops the XFS-own i_iolock and uses the VFS i_rwsem which recently replaced i_mutex instead. This means we only have to take one lock instead of two in many fast path operations, and we can also shrink the xfs_inode structure. Thanks to the xfs_ilock family there is very little churn, the only thing of note is that we need to switch to use the lock_two_directory helper for taking the i_rwsem on two inodes in a few places to make sure our lock order matches the one used in the VFS. Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Jens Axboe <axboe@fb.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
20 lines
601 B
C
20 lines
601 B
C
#ifndef _XFS_PNFS_H
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#define _XFS_PNFS_H 1
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#ifdef CONFIG_EXPORTFS_BLOCK_OPS
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int xfs_fs_get_uuid(struct super_block *sb, u8 *buf, u32 *len, u64 *offset);
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int xfs_fs_map_blocks(struct inode *inode, loff_t offset, u64 length,
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struct iomap *iomap, bool write, u32 *device_generation);
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int xfs_fs_commit_blocks(struct inode *inode, struct iomap *maps, int nr_maps,
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struct iattr *iattr);
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int xfs_break_layouts(struct inode *inode, uint *iolock);
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#else
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static inline int
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xfs_break_layouts(struct inode *inode, uint *iolock)
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{
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return 0;
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}
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#endif /* CONFIG_EXPORTFS_BLOCK_OPS */
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#endif /* _XFS_PNFS_H */
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