From: Christoph Hellwig <hch@lst.de>
To: viro@zeniv.linux.org.uk, zippel@linux-m68k.org
Cc: linux-fsdevel@vger.kernel.org
Subject: [PATCH 10/14] hfsplus: use atomic bitops for the superblock flags
Date: Fri, 1 Oct 2010 09:27:04 +0200 [thread overview]
Message-ID: <20101001072704.GJ27055@lst.de> (raw)
In-Reply-To: <20101001072500.GA26972@lst.de>
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>
Index: linux-2.6/fs/hfsplus/btree.c
===================================================================
--- linux-2.6.orig/fs/hfsplus/btree.c 2010-09-30 12:02:01.000000000 +0200
+++ linux-2.6/fs/hfsplus/btree.c 2010-09-30 12:07:40.968782589 +0200
@@ -61,12 +61,12 @@ struct hfs_btree *hfs_btree_open(struct
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");
Index: linux-2.6/fs/hfsplus/hfsplus_fs.h
===================================================================
--- linux-2.6.orig/fs/hfsplus/hfsplus_fs.h 2010-09-30 12:07:35.000000000 +0200
+++ linux-2.6/fs/hfsplus/hfsplus_fs.h 2010-09-30 12:07:40.968782589 +0200
@@ -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 {
Index: linux-2.6/fs/hfsplus/options.c
===================================================================
--- linux-2.6.orig/fs/hfsplus/options.c 2010-09-30 12:02:00.000000000 +0200
+++ linux-2.6/fs/hfsplus/options.c 2010-09-30 12:07:40.973782653 +0200
@@ -143,13 +143,13 @@ int hfsplus_parse_options(char *input, s
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_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;
}
Index: linux-2.6/fs/hfsplus/super.c
===================================================================
--- linux-2.6.orig/fs/hfsplus/super.c 2010-09-30 12:07:35.639782662 +0200
+++ linux-2.6/fs/hfsplus/super.c 2010-09-30 12:07:58.153782622 +0200
@@ -119,7 +119,7 @@ static int hfsplus_system_write_inode(st
}
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 *
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 *
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_
"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 sup
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 sup
"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);
Index: linux-2.6/fs/hfsplus/unicode.c
===================================================================
--- linux-2.6.orig/fs/hfsplus/unicode.c 2010-09-30 12:02:00.000000000 +0200
+++ linux-2.6/fs/hfsplus/unicode.c 2010-09-30 12:07:40.992782662 +0200
@@ -132,7 +132,7 @@ int hfsplus_uni2asc(struct super_block *
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 *
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 *d
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
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;
Index: linux-2.6/fs/hfsplus/wrapper.c
===================================================================
--- linux-2.6.orig/fs/hfsplus/wrapper.c 2010-09-30 12:02:00.000000000 +0200
+++ linux-2.6/fs/hfsplus/wrapper.c 2010-09-30 12:07:40.999782662 +0200
@@ -123,7 +123,7 @@ int hfsplus_read_wrapper(struct super_bl
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_bl
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;
next prev parent reply other threads:[~2010-10-01 7:27 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-01 7:25 [PATCH 0/14] more hfsplus updates Christoph Hellwig
2010-10-01 7:25 ` [PATCH 1/14] hfsplus: fix HFSPLUS_SB calling convention Christoph Hellwig
2010-10-01 7:25 ` [PATCH 2/14] hfsplus: fix HFSPLUS_I " Christoph Hellwig
2010-10-01 7:25 ` [PATCH 3/14] hfsplus: clean up hfsplus_iget Christoph Hellwig
2010-10-01 7:26 ` [PATCH 4/14] hfsplus: clean up hfsplus_write_inode Christoph Hellwig
2010-10-01 7:26 ` [PATCH 5/14] hfsplus: merge mknod/mkdir/creat Christoph Hellwig
2010-10-01 7:26 ` [PATCH 6/14] hfsplus: fix error handling in hfsplus_symlink Christoph Hellwig
2010-10-01 7:26 ` [PATCH 7/14] hfsplus: do not cache and write next_alloc Christoph Hellwig
2010-10-01 7:26 ` [PATCH 8/14] hfsplus: remove the rsrc_inodes list Christoph Hellwig
2010-10-01 7:26 ` [PATCH 9/14] hfsplus: add per-superblock lock for volume header updates Christoph Hellwig
2010-10-01 7:27 ` Christoph Hellwig [this message]
2010-10-01 7:27 ` [PATCH 11/14] hfsplus: protect readdir against removals from open_dir_list Christoph Hellwig
2010-10-01 7:27 ` [PATCH 12/14] hfsplus: add missing extent locking in hfsplus_write_inode Christoph Hellwig
2010-10-01 7:27 ` [PATCH 13/14] hfsplus: convert tree_lock to mutex Christoph Hellwig
2010-10-01 7:28 ` [PATCH 14/14] hfsplus: fix rename over directories Christoph Hellwig
2010-10-01 14:06 ` [PATCH 0/14] more hfsplus updates Christoph Hellwig
2010-10-01 14:16 ` Christoph Hellwig
2010-10-02 4:09 ` Stephen Rothwell
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