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kernfs: Rearrange kernfs_node fields to reduce its size on 64bit 

Moving .flags and .mode right below .hash makes kernfs_node smaller by 8
bytes on 64bit. To avoid creating a hole from 8 bytes alignment on 32bit
archs, .priv is moved below so that there are two 32bit pointers after the
64bit .id field.

v2: Updated to avoid size increase on 32bit noticed by Geert.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/ZZ7hwA18nfmFjYpj@slm.duckdns.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo 2024-01-10 08:28:16 -10:00 committed by Greg Kroah-Hartman
parent 41bccc98fb
commit 1c9f2c7606
1 changed files with 4 additions and 4 deletions
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8
include/linux/kernfs.h
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@ -206,22 +206,22 @@ struct kernfs_node {
const void *ns; /* namespace tag */
unsigned int hash; /* ns + name hash */
unsigned short flags;
umode_t mode;
union {
struct kernfs_elem_dir dir;
struct kernfs_elem_symlink symlink;
struct kernfs_elem_attr attr;
};
void *priv;
/*
* 64bit unique ID. On 64bit ino setups, id is the ino. On 32bit,
* the low 32bits are ino and upper generation.
*/
u64 id;
unsigned short flags;
umode_t mode;
void *priv;
struct kernfs_iattrs *iattr;
};