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fs: uninline inode_maybe_inc_iversion()

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It has many callsites and is large.

   text	   data	    bss	    dec	    hex	filename
  91796	  15984	    512	 108292	  1a704	mm/shmem.o-before
  91180	  15984	    512	 107676	  1a49c	mm/shmem.o-after

Acked-by: Jeff Layton <jlayton@kernel.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Andrew Morton 2022-09-09 13:57:41 -07:00
parent 1179083ff0
commit 5ca14835dc
2 changed files with 47 additions and 45 deletions
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46
fs/libfs.c
View File

@ -15,6 +15,7 @@
#include <linux/mutex.h>
#include <linux/namei.h>
#include <linux/exportfs.h>
#include <linux/iversion.h>
#include <linux/writeback.h>
#include <linux/buffer_head.h> /* sync_mapping_buffers */
#include <linux/fs_context.h>
@ -1520,3 +1521,48 @@ void generic_set_encrypted_ci_d_ops(struct dentry *dentry)
#endif
}
EXPORT_SYMBOL(generic_set_encrypted_ci_d_ops);
/**
* inode_maybe_inc_iversion - increments i_version
* @inode: inode with the i_version that should be updated
* @force: increment the counter even if it's not necessary?
*
* Every time the inode is modified, the i_version field must be seen to have
* changed by any observer.
*
* If "force" is set or the QUERIED flag is set, then ensure that we increment
* the value, and clear the queried flag.
*
* In the common case where neither is set, then we can return "false" without
* updating i_version.
*
* If this function returns false, and no other metadata has changed, then we
* can avoid logging the metadata.
*/
bool inode_maybe_inc_iversion(struct inode *inode, bool force)
{
u64 cur, new;
/*
* The i_version field is not strictly ordered with any other inode
* information, but the legacy inode_inc_iversion code used a spinlock
* to serialize increments.
*
* Here, we add full memory barriers to ensure that any de-facto
* ordering with other info is preserved.
*
* This barrier pairs with the barrier in inode_query_iversion()
*/
smp_mb();
cur = inode_peek_iversion_raw(inode);
do {
/* If flag is clear then we needn't do anything */
if (!force && !(cur & I_VERSION_QUERIED))
return false;
/* Since lowest bit is flag, add 2 to avoid it */
new = (cur & ~I_VERSION_QUERIED) + I_VERSION_INCREMENT;
} while (!atomic64_try_cmpxchg(&inode->i_version, &cur, new));
return true;
}
EXPORT_SYMBOL(inode_maybe_inc_iversion);

46
include/linux/iversion.h
View File

@ -172,51 +172,7 @@ inode_set_iversion_queried(struct inode *inode, u64 val)
I_VERSION_QUERIED);
}
/**
* inode_maybe_inc_iversion - increments i_version
* @inode: inode with the i_version that should be updated
* @force: increment the counter even if it's not necessary?
*
* Every time the inode is modified, the i_version field must be seen to have
* changed by any observer.
*
* If "force" is set or the QUERIED flag is set, then ensure that we increment
* the value, and clear the queried flag.
*
* In the common case where neither is set, then we can return "false" without
* updating i_version.
*
* If this function returns false, and no other metadata has changed, then we
* can avoid logging the metadata.
*/
static inline bool
inode_maybe_inc_iversion(struct inode *inode, bool force)
{
u64 cur, new;
/*
* The i_version field is not strictly ordered with any other inode
* information, but the legacy inode_inc_iversion code used a spinlock
* to serialize increments.
*
* Here, we add full memory barriers to ensure that any de-facto
* ordering with other info is preserved.
*
* This barrier pairs with the barrier in inode_query_iversion()
*/
smp_mb();
cur = inode_peek_iversion_raw(inode);
do {
/* If flag is clear then we needn't do anything */
if (!force && !(cur & I_VERSION_QUERIED))
return false;
/* Since lowest bit is flag, add 2 to avoid it */
new = (cur & ~I_VERSION_QUERIED) + I_VERSION_INCREMENT;
} while (!atomic64_try_cmpxchg(&inode->i_version, &cur, new));
return true;
}
bool inode_maybe_inc_iversion(struct inode *inode, bool force);
/**
* inode_inc_iversion - forcibly increment i_version