No functional changes in this patch, just in preparation for
allowing applications to pass in hints about data life times
for writes.
Pack the i_write_hint field into a 2-byte hole, so we don't grow
the size of the inode.
Reviewed-by: Andreas Dilger <adilger@xxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
---
fs/inode.c | 1 +
include/linux/fs.h | 9 +++++++++
2 files changed, 10 insertions(+)
diff --git a/fs/inode.c b/fs/inode.c
index db5914783a71..bd8bf44f3f31 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -149,6 +149,7 @@ int inode_init_always(struct super_block *sb, struct inode *inode)
inode->i_blocks = 0;
inode->i_bytes = 0;
inode->i_generation = 0;
+ inode->i_write_hint = 0;
inode->i_pipe = NULL;
inode->i_bdev = NULL;
inode->i_cdev = NULL;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 803e5a9b2654..f4f9df8ed059 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -591,6 +591,7 @@ struct inode {
struct timespec i_ctime;
spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
unsigned short i_bytes;
+ unsigned short i_write_hint;
unsigned int i_blkbits;
blkcnt_t i_blocks;
@@ -655,6 +656,14 @@ struct inode {
void *i_private; /* fs or device private pointer */
};
+static inline unsigned int inode_write_hint(struct inode *inode)
+{
+ if (inode)
+ return inode->i_write_hint;
+
+ return 0;
+}
+
static inline unsigned int i_blocksize(const struct inode *node)
{
return (1 << node->i_blkbits);
--
2.7.4
