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ext2: mark s_mount_state as guarded by s_lock

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s_mount_state tracks the filesystem's mount/error state and is protected
by s_lock everywhere it is accessed. Annotate it with __guarded_by() for
Clang's context analysis.

ext2_setup_super() reads s_mount_state and is called with s_lock held
from the remount path, so annotate it with __must_hold().

There are two accesses (the initial read in ext2_fill_super() and the
setup_super() call) in the mount flow. This is before the superblock
is live, so no concurrent access should be possible. Convert the
spinlock initialization to use guard(spinlock_init) to prevent
warnings on the writes later in initialization.

Signed-off-by: Timothy Day <timday@thelustrecollective.com>
Acked-by: Marco Elver <elver@google.com>
Link: https://patch.msgid.link/20260811160336.782342-5-timday@thelustrecollective.com
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Timothy Day 2026-08-11 12:03:32 -04:00 committed by Jan Kara
parent 3d0c4287b7
commit 023051c2d0
2 changed files with 3 additions and 2 deletions
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2
fs/ext2/ext2.h
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@ -86,7 +86,7 @@ struct ext2_sb_info {
unsigned long s_sb_block;
kuid_t s_resuid;
kgid_t s_resgid;
unsigned short s_mount_state;
unsigned short s_mount_state __guarded_by(&s_lock);
unsigned short s_pad;
int s_addr_per_block_bits;
int s_desc_per_block_bits;

3
fs/ext2/super.c
View File

@ -634,6 +634,7 @@ static int ext2_parse_param(struct fs_context *fc, struct fs_parameter *param)
static int ext2_setup_super (struct super_block * sb,
struct ext2_super_block * es,
int read_only)
__must_hold(&EXT2_SB(sb)->s_lock)
{
int res = 0;
struct ext2_sb_info *sbi = EXT2_SB(sb);
@ -895,7 +896,7 @@ static int ext2_fill_super(struct super_block *sb, struct fs_context *fc)
sb->s_fs_info = sbi;
sbi->s_sb_block = sb_block;
spin_lock_init(&sbi->s_lock);
guard(spinlock_init)(&EXT2_SB(sb)->s_lock);
ret = -EINVAL;
/*