From 470cca56c366428d4d5785a0a5a291619c332c7f Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Thu, 4 Sep 2014 16:26:19 +0200 Subject: udf: Set i_generation field Currently UDF doesn't initialize i_generation in any way and thus NFS can easily get reallocated inodes from stale file handles. Luckily UDF already has a unique object identifier associated with each inode - i_unique. Use that for initialization of i_generation. Signed-off-by: Jan Kara --- fs/udf/ialloc.c | 1 + 1 file changed, 1 insertion(+) (limited to 'fs/udf/ialloc.c') diff --git a/fs/udf/ialloc.c b/fs/udf/ialloc.c index 6eaf5edf1ea1..647370d70175 100644 --- a/fs/udf/ialloc.c +++ b/fs/udf/ialloc.c @@ -95,6 +95,7 @@ struct inode *udf_new_inode(struct inode *dir, umode_t mode, int *err) lvidiu = udf_sb_lvidiu(sb); if (lvidiu) { iinfo->i_unique = lvid_get_unique_id(sb); + inode->i_generation = iinfo->i_unique; mutex_lock(&sbi->s_alloc_mutex); if (S_ISDIR(mode)) le32_add_cpu(&lvidiu->numDirs, 1); -- cgit From b231509616feb911c2a7a8814d58c0014ef5b17f Mon Sep 17 00:00:00 2001 From: Al Viro Date: Thu, 4 Sep 2014 09:38:11 -0400 Subject: udf: fix the udf_iget() vs. udf_new_inode() races Currently udf_iget() (triggered by NFS) can race with udf_new_inode() leading to two inode structures with the same inode number: nfsd: iget_locked() creates inode nfsd: try to read from disk, block on that. udf_new_inode(): allocate inode with that inumber udf_new_inode(): insert it into icache, set it up and dirty udf_write_inode(): write inode into buffer cache nfsd: get CPU again, look into buffer cache, see nice and sane on-disk inode, set the in-core inode from it Fix the problem by putting inode into icache in locked state (I_NEW set) and unlocking it only after it's fully set up. Signed-off-by: Al Viro Signed-off-by: Jan Kara --- fs/udf/ialloc.c | 7 ++++++- fs/udf/namei.c | 7 +++++++ 2 files changed, 13 insertions(+), 1 deletion(-) (limited to 'fs/udf/ialloc.c') diff --git a/fs/udf/ialloc.c b/fs/udf/ialloc.c index 647370d70175..598f33bdcd26 100644 --- a/fs/udf/ialloc.c +++ b/fs/udf/ialloc.c @@ -124,7 +124,12 @@ struct inode *udf_new_inode(struct inode *dir, umode_t mode, int *err) iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG; inode->i_mtime = inode->i_atime = inode->i_ctime = iinfo->i_crtime = current_fs_time(inode->i_sb); - insert_inode_hash(inode); + if (unlikely(insert_inode_locked(inode) < 0)) { + make_bad_inode(inode); + iput(inode); + *err = -EIO; + return NULL; + } mark_inode_dirty(inode); *err = 0; diff --git a/fs/udf/namei.c b/fs/udf/namei.c index abec86466735..d106fdd1bef7 100644 --- a/fs/udf/namei.c +++ b/fs/udf/namei.c @@ -559,6 +559,7 @@ static int udf_add_nondir(struct dentry *dentry, struct inode *inode) fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err); if (unlikely(!fi)) { inode_dec_link_count(inode); + unlock_new_inode(inode); iput(inode); return err; } @@ -572,6 +573,7 @@ static int udf_add_nondir(struct dentry *dentry, struct inode *inode) if (fibh.sbh != fibh.ebh) brelse(fibh.ebh); brelse(fibh.sbh); + unlock_new_inode(inode); d_instantiate(dentry, inode); return 0; @@ -619,6 +621,7 @@ static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) mark_inode_dirty(inode); d_tmpfile(dentry, inode); + unlock_new_inode(inode); return 0; } @@ -660,6 +663,7 @@ static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err); if (!fi) { inode_dec_link_count(inode); + unlock_new_inode(inode); iput(inode); goto out; } @@ -678,6 +682,7 @@ static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) if (!fi) { clear_nlink(inode); mark_inode_dirty(inode); + unlock_new_inode(inode); iput(inode); goto out; } @@ -689,6 +694,7 @@ static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL); inc_nlink(dir); mark_inode_dirty(dir); + unlock_new_inode(inode); d_instantiate(dentry, inode); if (fibh.sbh != fibh.ebh) brelse(fibh.ebh); @@ -996,6 +1002,7 @@ out: out_no_entry: up_write(&iinfo->i_data_sem); inode_dec_link_count(inode); + unlock_new_inode(inode); iput(inode); goto out; } -- cgit From 0b93a92be4cb48f22b78c95dea84089a1e72f860 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Thu, 4 Sep 2014 09:47:41 -0400 Subject: udf: saner calling conventions for udf_new_inode() Signed-off-by: Al Viro Signed-off-by: Jan Kara --- fs/udf/ialloc.c | 24 ++++++++++-------------- fs/udf/namei.c | 44 ++++++++++++++++---------------------------- fs/udf/udfdecl.h | 2 +- 3 files changed, 27 insertions(+), 43 deletions(-) (limited to 'fs/udf/ialloc.c') diff --git a/fs/udf/ialloc.c b/fs/udf/ialloc.c index 598f33bdcd26..e77db621ec89 100644 --- a/fs/udf/ialloc.c +++ b/fs/udf/ialloc.c @@ -45,7 +45,7 @@ void udf_free_inode(struct inode *inode) udf_free_blocks(sb, NULL, &UDF_I(inode)->i_location, 0, 1); } -struct inode *udf_new_inode(struct inode *dir, umode_t mode, int *err) +struct inode *udf_new_inode(struct inode *dir, umode_t mode) { struct super_block *sb = dir->i_sb; struct udf_sb_info *sbi = UDF_SB(sb); @@ -55,14 +55,12 @@ struct inode *udf_new_inode(struct inode *dir, umode_t mode, int *err) struct udf_inode_info *iinfo; struct udf_inode_info *dinfo = UDF_I(dir); struct logicalVolIntegrityDescImpUse *lvidiu; + int err; inode = new_inode(sb); - if (!inode) { - *err = -ENOMEM; - return NULL; - } - *err = -ENOSPC; + if (!inode) + return ERR_PTR(-ENOMEM); iinfo = UDF_I(inode); if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) { @@ -80,16 +78,16 @@ struct inode *udf_new_inode(struct inode *dir, umode_t mode, int *err) } if (!iinfo->i_ext.i_data) { iput(inode); - *err = -ENOMEM; - return NULL; + return ERR_PTR(-ENOMEM); } + err = -ENOSPC; block = udf_new_block(dir->i_sb, NULL, dinfo->i_location.partitionReferenceNum, - start, err); - if (*err) { + start, &err); + if (err) { iput(inode); - return NULL; + return ERR_PTR(err); } lvidiu = udf_sb_lvidiu(sb); @@ -127,11 +125,9 @@ struct inode *udf_new_inode(struct inode *dir, umode_t mode, int *err) if (unlikely(insert_inode_locked(inode) < 0)) { make_bad_inode(inode); iput(inode); - *err = -EIO; - return NULL; + return ERR_PTR(-EIO); } mark_inode_dirty(inode); - *err = 0; return inode; } diff --git a/fs/udf/namei.c b/fs/udf/namei.c index d106fdd1bef7..c12e260fd6c4 100644 --- a/fs/udf/namei.c +++ b/fs/udf/namei.c @@ -582,13 +582,10 @@ static int udf_add_nondir(struct dentry *dentry, struct inode *inode) static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) { - struct inode *inode; - int err; + struct inode *inode = udf_new_inode(dir, mode); - inode = udf_new_inode(dir, mode, &err); - if (!inode) { - return err; - } + if (IS_ERR(inode)) + return PTR_ERR(inode); if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) inode->i_data.a_ops = &udf_adinicb_aops; @@ -603,23 +600,18 @@ static int udf_create(struct inode *dir, struct dentry *dentry, umode_t mode, static int udf_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) { - struct inode *inode; - struct udf_inode_info *iinfo; - int err; + struct inode *inode = udf_new_inode(dir, mode); - inode = udf_new_inode(dir, mode, &err); - if (!inode) - return err; + if (IS_ERR(inode)) + return PTR_ERR(inode); - iinfo = UDF_I(inode); - if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) + if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) inode->i_data.a_ops = &udf_adinicb_aops; else inode->i_data.a_ops = &udf_aops; inode->i_op = &udf_file_inode_operations; inode->i_fop = &udf_file_operations; mark_inode_dirty(inode); - d_tmpfile(dentry, inode); unlock_new_inode(inode); return 0; @@ -629,15 +621,13 @@ static int udf_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) { struct inode *inode; - int err; if (!old_valid_dev(rdev)) return -EINVAL; - err = -EIO; - inode = udf_new_inode(dir, mode, &err); - if (!inode) - return err; + inode = udf_new_inode(dir, mode); + if (IS_ERR(inode)) + return PTR_ERR(inode); init_special_inode(inode, mode, rdev); return udf_add_nondir(dentry, inode); @@ -652,10 +642,9 @@ static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) struct udf_inode_info *dinfo = UDF_I(dir); struct udf_inode_info *iinfo; - err = -EIO; - inode = udf_new_inode(dir, S_IFDIR | mode, &err); - if (!inode) - goto out; + inode = udf_new_inode(dir, S_IFDIR | mode); + if (IS_ERR(inode)) + return PTR_ERR(inode); iinfo = UDF_I(inode); inode->i_op = &udf_dir_inode_operations; @@ -861,7 +850,7 @@ out: static int udf_symlink(struct inode *dir, struct dentry *dentry, const char *symname) { - struct inode *inode; + struct inode *inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO); struct pathComponent *pc; const char *compstart; struct extent_position epos = {}; @@ -874,9 +863,8 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry, struct udf_inode_info *iinfo; struct super_block *sb = dir->i_sb; - inode = udf_new_inode(dir, S_IFLNK | S_IRWXUGO, &err); - if (!inode) - goto out; + if (IS_ERR(inode)) + return PTR_ERR(inode); iinfo = UDF_I(inode); down_write(&iinfo->i_data_sem); diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h index 41a8115c9345..742557be9936 100644 --- a/fs/udf/udfdecl.h +++ b/fs/udf/udfdecl.h @@ -208,7 +208,7 @@ extern int udf_CS0toUTF8(struct ustr *, const struct ustr *); /* ialloc.c */ extern void udf_free_inode(struct inode *); -extern struct inode *udf_new_inode(struct inode *, umode_t, int *); +extern struct inode *udf_new_inode(struct inode *, umode_t); /* truncate.c */ extern void udf_truncate_tail_extent(struct inode *); -- cgit