fs/nfs/io.c

17 /* Call with exclusively locked inode->i_rwsem */
18 static void nfs_block_o_direct(struct nfs_inode *nfsi, struct inode *inode)
22 		inode_dio_wait(inode);
28  * @inode: file inode
33  * and holds a shared lock on inode->i_rwsem to ensure that the flag
40  * inode->i_rwsem, meaning that those are serialised w.r.t. the reads.
43 nfs_start_io_read(struct inode *inode)
45 	struct nfs_inode *nfsi = NFS_I(inode);
47 	down_read(&inode->i_rwsem);
50 	up_read(&inode->i_rwsem);
52 	down_write(&inode->i_rwsem);
53 	nfs_block_o_direct(nfsi, inode);
54 	downgrade_write(&inode->i_rwsem);
59  * @inode: file inode
62  * lock on inode->i_rwsem.
65 nfs_end_io_read(struct inode *inode)
67 	up_read(&inode->i_rwsem);
72  * @inode: file inode
78 nfs_start_io_write(struct inode *inode)
80 	down_write(&inode->i_rwsem);
81 	nfs_block_o_direct(NFS_I(inode), inode);
86  * @inode: file inode
89  * lock on inode->i_rwsem.
92 nfs_end_io_write(struct inode *inode)
94 	up_write(&inode->i_rwsem);
97 /* Call with exclusively locked inode->i_rwsem */
98 static void nfs_block_buffered(struct nfs_inode *nfsi, struct inode *inode)
102 		nfs_sync_mapping(inode->i_mapping);
108  * @inode: file inode
113  * and holds a shared lock on inode->i_rwsem to ensure that the flag
120  * inode->i_rwsem, meaning that those are serialised w.r.t. O_DIRECT.
123 nfs_start_io_direct(struct inode *inode)
125 	struct nfs_inode *nfsi = NFS_I(inode);
127 	down_read(&inode->i_rwsem);
130 	up_read(&inode->i_rwsem);
132 	down_write(&inode->i_rwsem);
133 	nfs_block_buffered(nfsi, inode);
134 	downgrade_write(&inode->i_rwsem);
139  * @inode: file inode
142  * lock on inode->i_rwsem.
145 nfs_end_io_direct(struct inode *inode)
147 	up_read(&inode->i_rwsem);