udf: Move handling of uniqueID into a helper function and protect it by a s_alloc_mutex
uniqueID handling has been duplicated in three places. Move it into a common
helper. Since we modify an LVID buffer with uniqueID update, we take
sbi->s_alloc_mutex to protect agaist other modifications of the structure.
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/udf/ialloc.c b/fs/udf/ialloc.c
index 75d9304..6fb7e0a 100644
--- a/fs/udf/ialloc.c
+++ b/fs/udf/ialloc.c
@@ -92,28 +92,19 @@
return NULL;
}
- mutex_lock(&sbi->s_alloc_mutex);
if (sbi->s_lvid_bh) {
- struct logicalVolIntegrityDesc *lvid =
- (struct logicalVolIntegrityDesc *)
- sbi->s_lvid_bh->b_data;
- struct logicalVolIntegrityDescImpUse *lvidiu =
- udf_sb_lvidiu(sbi);
- struct logicalVolHeaderDesc *lvhd;
- uint64_t uniqueID;
- lvhd = (struct logicalVolHeaderDesc *)
- (lvid->logicalVolContentsUse);
+ struct logicalVolIntegrityDescImpUse *lvidiu;
+
+ iinfo->i_unique = lvid_get_unique_id(sb);
+ mutex_lock(&sbi->s_alloc_mutex);
+ lvidiu = udf_sb_lvidiu(sbi);
if (S_ISDIR(mode))
le32_add_cpu(&lvidiu->numDirs, 1);
else
le32_add_cpu(&lvidiu->numFiles, 1);
- iinfo->i_unique = uniqueID = le64_to_cpu(lvhd->uniqueID);
- if (!(++uniqueID & 0x00000000FFFFFFFFUL))
- uniqueID += 16;
- lvhd->uniqueID = cpu_to_le64(uniqueID);
udf_updated_lvid(sb);
+ mutex_unlock(&sbi->s_alloc_mutex);
}
- mutex_unlock(&sbi->s_alloc_mutex);
inode_init_owner(inode, dir, mode);
diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index 6d8dc02..701fcda 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -890,8 +890,8 @@
int block;
unsigned char *name = NULL;
int namelen;
- struct buffer_head *bh;
struct udf_inode_info *iinfo;
+ struct super_block *sb = dir->i_sb;
lock_kernel();
inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err);
@@ -912,7 +912,7 @@
struct kernel_lb_addr eloc;
uint32_t bsize;
- block = udf_new_block(inode->i_sb, inode,
+ block = udf_new_block(sb, inode,
iinfo->i_location.partitionReferenceNum,
iinfo->i_location.logicalBlockNum, &err);
if (!block)
@@ -923,17 +923,17 @@
eloc.logicalBlockNum = block;
eloc.partitionReferenceNum =
iinfo->i_location.partitionReferenceNum;
- bsize = inode->i_sb->s_blocksize;
+ bsize = sb->s_blocksize;
iinfo->i_lenExtents = bsize;
udf_add_aext(inode, &epos, &eloc, bsize, 0);
brelse(epos.bh);
- block = udf_get_pblock(inode->i_sb, block,
+ block = udf_get_pblock(sb, block,
iinfo->i_location.partitionReferenceNum,
0);
- epos.bh = udf_tgetblk(inode->i_sb, block);
+ epos.bh = udf_tgetblk(sb, block);
lock_buffer(epos.bh);
- memset(epos.bh->b_data, 0x00, inode->i_sb->s_blocksize);
+ memset(epos.bh->b_data, 0x00, bsize);
set_buffer_uptodate(epos.bh);
unlock_buffer(epos.bh);
mark_buffer_dirty_inode(epos.bh, inode);
@@ -941,7 +941,7 @@
} else
ea = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
- eoffset = inode->i_sb->s_blocksize - udf_ext0_offset(inode);
+ eoffset = sb->s_blocksize - udf_ext0_offset(inode);
pc = (struct pathComponent *)ea;
if (*symname == '/') {
@@ -981,7 +981,7 @@
}
if (pc->componentType == 5) {
- namelen = udf_put_filename(inode->i_sb, compstart, name,
+ namelen = udf_put_filename(sb, compstart, name,
symname - compstart);
if (!namelen)
goto out_no_entry;
@@ -1015,23 +1015,11 @@
fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
if (!fi)
goto out_no_entry;
- cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
+ cfi.icb.extLength = cpu_to_le32(sb->s_blocksize);
cfi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
- bh = UDF_SB(inode->i_sb)->s_lvid_bh;
- if (bh) {
- struct logicalVolIntegrityDesc *lvid =
- (struct logicalVolIntegrityDesc *)bh->b_data;
- struct logicalVolHeaderDesc *lvhd;
- uint64_t uniqueID;
- lvhd = (struct logicalVolHeaderDesc *)
- lvid->logicalVolContentsUse;
- uniqueID = le64_to_cpu(lvhd->uniqueID);
+ if (UDF_SB(inode->i_sb)->s_lvid_bh) {
*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
- cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
- if (!(++uniqueID & 0x00000000FFFFFFFFUL))
- uniqueID += 16;
- lvhd->uniqueID = cpu_to_le64(uniqueID);
- mark_buffer_dirty(bh);
+ cpu_to_le32(lvid_get_unique_id(sb));
}
udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
@@ -1060,7 +1048,6 @@
struct udf_fileident_bh fibh;
struct fileIdentDesc cfi, *fi;
int err;
- struct buffer_head *bh;
lock_kernel();
if (inode->i_nlink >= (256 << sizeof(inode->i_nlink)) - 1) {
@@ -1075,21 +1062,9 @@
}
cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
cfi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
- bh = UDF_SB(inode->i_sb)->s_lvid_bh;
- if (bh) {
- struct logicalVolIntegrityDesc *lvid =
- (struct logicalVolIntegrityDesc *)bh->b_data;
- struct logicalVolHeaderDesc *lvhd;
- uint64_t uniqueID;
- lvhd = (struct logicalVolHeaderDesc *)
- (lvid->logicalVolContentsUse);
- uniqueID = le64_to_cpu(lvhd->uniqueID);
+ if (UDF_SB(inode->i_sb)->s_lvid_bh) {
*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
- cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
- if (!(++uniqueID & 0x00000000FFFFFFFFUL))
- uniqueID += 16;
- lvhd->uniqueID = cpu_to_le64(uniqueID);
- mark_buffer_dirty(bh);
+ cpu_to_le32(lvid_get_unique_id(inode->i_sb));
}
udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
if (UDF_I(dir)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
diff --git a/fs/udf/super.c b/fs/udf/super.c
index f99ff5d..948e1ac 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1823,6 +1823,33 @@
sbi->s_lvid_dirty = 0;
}
+u64 lvid_get_unique_id(struct super_block *sb)
+{
+ struct buffer_head *bh;
+ struct udf_sb_info *sbi = UDF_SB(sb);
+ struct logicalVolIntegrityDesc *lvid;
+ struct logicalVolHeaderDesc *lvhd;
+ u64 uniqueID;
+ u64 ret;
+
+ bh = sbi->s_lvid_bh;
+ if (!bh)
+ return 0;
+
+ lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
+ lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
+
+ mutex_lock(&sbi->s_alloc_mutex);
+ ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
+ if (!(++uniqueID & 0xFFFFFFFF))
+ uniqueID += 16;
+ lvhd->uniqueID = cpu_to_le64(uniqueID);
+ mutex_unlock(&sbi->s_alloc_mutex);
+ mark_buffer_dirty(bh);
+
+ return ret;
+}
+
static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
{
int i;
diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h
index f25e57e..eba4820 100644
--- a/fs/udf/udfdecl.h
+++ b/fs/udf/udfdecl.h
@@ -125,6 +125,7 @@
sb->s_dirt = 1;
UDF_SB(sb)->s_lvid_dirty = 1;
}
+extern u64 lvid_get_unique_id(struct super_block *sb);
/* namei.c */
extern int udf_write_fi(struct inode *inode, struct fileIdentDesc *,