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hfsplus: use atomic bitops for the superblock flags

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The flags in the HFS+-specific superlock do get modified during runtime,
use atomic bitops to make the modifications SMP safe.

Signed-off-by: Christoph Hellwig <hch@tuxera.com>
This commit is contained in:
Christoph Hellwig 2010-10-01 05:45:20 +02:00 committed by Christoph Hellwig
parent 7ac9fb9c2a
commit 84adede312
6 changed files with 30 additions and 28 deletions
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4
fs/hfsplus/btree.c
View File

@ -61,12 +61,12 @@ struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id)
if (id == HFSPLUS_EXT_CNID) {
tree->keycmp = hfsplus_ext_cmp_key;
} else if (id == HFSPLUS_CAT_CNID) {
if ((HFSPLUS_SB(sb)->flags & HFSPLUS_SB_HFSX) &&
if (test_bit(HFSPLUS_SB_HFSX, &HFSPLUS_SB(sb)->flags) &&
(head->key_type == HFSPLUS_KEY_BINARY))
tree->keycmp = hfsplus_cat_bin_cmp_key;
else {
tree->keycmp = hfsplus_cat_case_cmp_key;
HFSPLUS_SB(sb)->flags |= HFSPLUS_SB_CASEFOLD;
set_bit(HFSPLUS_SB_CASEFOLD, &HFSPLUS_SB(sb)->flags);
}
} else {
printk(KERN_ERR "hfs: unknown B*Tree requested\n");

10
fs/hfsplus/hfsplus_fs.h
View File

@ -150,11 +150,11 @@ struct hfsplus_sb_info {
unsigned long flags;
};
#define HFSPLUS_SB_WRITEBACKUP 0x0001
#define HFSPLUS_SB_NODECOMPOSE 0x0002
#define HFSPLUS_SB_FORCE 0x0004
#define HFSPLUS_SB_HFSX 0x0008
#define HFSPLUS_SB_CASEFOLD 0x0010
#define HFSPLUS_SB_WRITEBACKUP 0
#define HFSPLUS_SB_NODECOMPOSE 1
#define HFSPLUS_SB_FORCE 2
#define HFSPLUS_SB_HFSX 3
#define HFSPLUS_SB_CASEFOLD 4
struct hfsplus_inode_info {

8
fs/hfsplus/options.c
View File

@ -143,13 +143,13 @@ int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi)
kfree(p);
break;
case opt_decompose:
sbi->flags &= ~HFSPLUS_SB_NODECOMPOSE;
clear_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
break;
case opt_nodecompose:
sbi->flags |= HFSPLUS_SB_NODECOMPOSE;
set_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags);
break;
case opt_force:
sbi->flags |= HFSPLUS_SB_FORCE;
set_bit(HFSPLUS_SB_FORCE, &sbi->flags);
break;
default:
return 0;
@ -184,7 +184,7 @@ int hfsplus_show_options(struct seq_file *seq, struct vfsmount *mnt)
seq_printf(seq, ",session=%u", sbi->session);
if (sbi->nls)
seq_printf(seq, ",nls=%s", sbi->nls->charset);
if (sbi->flags & HFSPLUS_SB_NODECOMPOSE)
if (test_bit(HFSPLUS_SB_NODECOMPOSE, &sbi->flags))
seq_printf(seq, ",nodecompose");
return 0;
}

10
fs/hfsplus/super.c
View File

@ -119,7 +119,7 @@ static int hfsplus_system_write_inode(struct inode *inode)
}
if (fork->total_size != cpu_to_be64(inode->i_size)) {
sbi->flags |= HFSPLUS_SB_WRITEBACKUP;
set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
inode->i_sb->s_dirt = 1;
}
hfsplus_inode_write_fork(inode, fork);
@ -170,7 +170,7 @@ int hfsplus_sync_fs(struct super_block *sb, int wait)
vhdr->file_count = cpu_to_be32(sbi->file_count);
mark_buffer_dirty(sbi->s_vhbh);
if (sbi->flags & HFSPLUS_SB_WRITEBACKUP) {
if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
if (sbi->sect_count) {
struct buffer_head *bh;
u32 block, offset;
@ -192,7 +192,6 @@ int hfsplus_sync_fs(struct super_block *sb, int wait)
printk(KERN_WARNING "hfs: backup not found!\n");
}
}
sbi->flags &= ~HFSPLUS_SB_WRITEBACKUP;
}
mutex_unlock(&sbi->alloc_mutex);
mutex_unlock(&sbi->vh_mutex);
@ -276,7 +275,7 @@ static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
"running fsck.hfsplus is recommended. leaving read-only.\n");
sb->s_flags |= MS_RDONLY;
*flags |= MS_RDONLY;
} else if (sbi.flags & HFSPLUS_SB_FORCE) {
} else if (test_bit(HFSPLUS_SB_FORCE, &sbi.flags)) {
/* nothing */
} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
printk(KERN_WARNING "hfs: filesystem is marked locked, leaving read-only.\n");
@ -376,7 +375,7 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
printk(KERN_WARNING "hfs: Filesystem was not cleanly unmounted, "
"running fsck.hfsplus is recommended. mounting read-only.\n");
sb->s_flags |= MS_RDONLY;
} else if (sbi->flags & HFSPLUS_SB_FORCE) {
} else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
/* nothing */
} else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
@ -386,7 +385,6 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
"use the force option at your own risk, mounting read-only.\n");
sb->s_flags |= MS_RDONLY;
}
sbi->flags &= ~HFSPLUS_SB_FORCE;
/* Load metadata objects (B*Trees) */
sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);

12
fs/hfsplus/unicode.c
View File

@ -132,7 +132,7 @@ int hfsplus_uni2asc(struct super_block *sb, const struct hfsplus_unistr *ustr, c
ustrlen = be16_to_cpu(ustr->length);
len = *len_p;
ce1 = NULL;
compose = !(HFSPLUS_SB(sb)->flags & HFSPLUS_SB_NODECOMPOSE);
compose = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);
while (ustrlen > 0) {
c0 = be16_to_cpu(*ip++);
@ -293,7 +293,7 @@ int hfsplus_asc2uni(struct super_block *sb, struct hfsplus_unistr *ustr,
u16 *dstr, outlen = 0;
wchar_t c;
decompose = !(HFSPLUS_SB(sb)->flags & HFSPLUS_SB_NODECOMPOSE);
decompose = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);
while (outlen < HFSPLUS_MAX_STRLEN && len > 0) {
size = asc2unichar(sb, astr, len, &c);
@ -330,8 +330,8 @@ int hfsplus_hash_dentry(struct dentry *dentry, struct qstr *str)
wchar_t c;
u16 c2;
casefold = (HFSPLUS_SB(sb)->flags & HFSPLUS_SB_CASEFOLD);
decompose = !(HFSPLUS_SB(sb)->flags & HFSPLUS_SB_NODECOMPOSE);
casefold = test_bit(HFSPLUS_SB_CASEFOLD, &HFSPLUS_SB(sb)->flags);
decompose = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);
hash = init_name_hash();
astr = str->name;
len = str->len;
@ -373,8 +373,8 @@ int hfsplus_compare_dentry(struct dentry *dentry, struct qstr *s1, struct qstr *
u16 c1, c2;
wchar_t c;
casefold = (HFSPLUS_SB(sb)->flags & HFSPLUS_SB_CASEFOLD);
decompose = !(HFSPLUS_SB(sb)->flags & HFSPLUS_SB_NODECOMPOSE);
casefold = test_bit(HFSPLUS_SB_CASEFOLD, &HFSPLUS_SB(sb)->flags);
decompose = !test_bit(HFSPLUS_SB_NODECOMPOSE, &HFSPLUS_SB(sb)->flags);
astr1 = s1->name;
len1 = s1->len;
astr2 = s2->name;

14
fs/hfsplus/wrapper.c
View File

@ -123,7 +123,7 @@ int hfsplus_read_wrapper(struct super_block *sb)
if (vhdr->signature == cpu_to_be16(HFSPLUS_VOLHEAD_SIG))
break;
if (vhdr->signature == cpu_to_be16(HFSPLUS_VOLHEAD_SIGX)) {
sbi->flags |= HFSPLUS_SB_HFSX;
set_bit(HFSPLUS_SB_HFSX, &sbi->flags);
break;
}
brelse(bh);
@ -169,10 +169,14 @@ int hfsplus_read_wrapper(struct super_block *sb)
return -EIO;
/* should still be the same... */
if (vhdr->signature != (sbi->flags & HFSPLUS_SB_HFSX ?
cpu_to_be16(HFSPLUS_VOLHEAD_SIGX) :
cpu_to_be16(HFSPLUS_VOLHEAD_SIG)))
goto error;
if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
if (vhdr->signature != cpu_to_be16(HFSPLUS_VOLHEAD_SIGX))
goto error;
} else {
if (vhdr->signature != cpu_to_be16(HFSPLUS_VOLHEAD_SIG))
goto error;
}
sbi->s_vhbh = bh;
sbi->s_vhdr = vhdr;