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authorNick Piggin <npiggin@kernel.dk>2011-01-07 17:49:55 +1100
committerNick Piggin <npiggin@kernel.dk>2011-01-07 17:50:28 +1100
commitfb045adb99d9b7c562dc7fef834857f78249daa1 (patch)
tree1fd6a4024fffeec568abe100d730589bfdb81c38 /drivers
parent5f57cbcc02cf18f6b22ef4066bb10afeb8f930ff (diff)
downloadlinux-fb045adb99d9b7c562dc7fef834857f78249daa1.tar.bz2
fs: dcache reduce branches in lookup path
Reduce some branches and memory accesses in dcache lookup by adding dentry flags to indicate common d_ops are set, rather than having to check them. This saves a pointer memory access (dentry->d_op) in common path lookup situations, and saves another pointer load and branch in cases where we have d_op but not the particular operation. Patched with: git grep -E '[.>]([[:space:]])*d_op([[:space:]])*=' | xargs sed -e 's/\([^\t ]*\)->d_op = \(.*\);/d_set_d_op(\1, \2);/' -e 's/\([^\t ]*\)\.d_op = \(.*\);/d_set_d_op(\&\1, \2);/' -i Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/staging/autofs/root.c2
-rw-r--r--drivers/staging/smbfs/dir.c8
2 files changed, 5 insertions, 5 deletions
diff --git a/drivers/staging/autofs/root.c b/drivers/staging/autofs/root.c
index 0fdec4befd84..b09adb57971f 100644
--- a/drivers/staging/autofs/root.c
+++ b/drivers/staging/autofs/root.c
@@ -237,7 +237,7 @@ static struct dentry *autofs_root_lookup(struct inode *dir, struct dentry *dentr
*
* We need to do this before we release the directory semaphore.
*/
- dentry->d_op = &autofs_dentry_operations;
+ d_set_d_op(dentry, &autofs_dentry_operations);
dentry->d_flags |= DCACHE_AUTOFS_PENDING;
d_add(dentry, NULL);
diff --git a/drivers/staging/smbfs/dir.c b/drivers/staging/smbfs/dir.c
index 5f79799d5d4a..78f09412740c 100644
--- a/drivers/staging/smbfs/dir.c
+++ b/drivers/staging/smbfs/dir.c
@@ -398,9 +398,9 @@ smb_new_dentry(struct dentry *dentry)
struct smb_sb_info *server = server_from_dentry(dentry);
if (server->mnt->flags & SMB_MOUNT_CASE)
- dentry->d_op = &smbfs_dentry_operations_case;
+ d_set_d_op(dentry, &smbfs_dentry_operations_case);
else
- dentry->d_op = &smbfs_dentry_operations;
+ d_set_d_op(dentry, &smbfs_dentry_operations);
dentry->d_time = jiffies;
}
@@ -462,9 +462,9 @@ smb_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
add_entry:
server = server_from_dentry(dentry);
if (server->mnt->flags & SMB_MOUNT_CASE)
- dentry->d_op = &smbfs_dentry_operations_case;
+ d_set_d_op(dentry, &smbfs_dentry_operations_case);
else
- dentry->d_op = &smbfs_dentry_operations;
+ d_set_d_op(dentry, &smbfs_dentry_operations);
d_add(dentry, inode);
smb_renew_times(dentry);