From d664b6af609ecf5e7dcedf92f0bf188e3a29b3e0 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Wed, 20 Oct 2010 18:28:46 +0200 Subject: 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 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 @@ struct inode *udf_new_inode(struct inode *dir, int mode, int *err) 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 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry, 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 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry, 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 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry, 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 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry, } 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 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry, } 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 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry, 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 @@ static int udf_link(struct dentry *old_dentry, struct inode *dir, 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 @@ static int udf_link(struct dentry *old_dentry, struct inode *dir, } 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 @@ static void udf_close_lvid(struct super_block *sb) 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 @@ static inline void udf_updated_lvid(struct super_block *sb) 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 *, -- cgit v0.10.2