From 5891d9dd2a47d38c205115211841a3d82304628f Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Thu, 16 Jul 2009 17:35:11 +0200 Subject: [PATCH 1/4] udf: Remove dead code Remove code that gets never used. Signed-off-by: Jan Kara --- fs/udf/directory.c | 86 ---------------------------------------------- fs/udf/lowlevel.c | 4 --- 2 files changed, 90 deletions(-) diff --git a/fs/udf/directory.c b/fs/udf/directory.c index 1d2c570704c8..2ffdb6733af1 100644 --- a/fs/udf/directory.c +++ b/fs/udf/directory.c @@ -18,59 +18,6 @@ #include #include -#if 0 -static uint8_t *udf_filead_read(struct inode *dir, uint8_t *tmpad, - uint8_t ad_size, struct kernel_lb_addr fe_loc, - int *pos, int *offset, struct buffer_head **bh, - int *error) -{ - int loffset = *offset; - int block; - uint8_t *ad; - int remainder; - - *error = 0; - - ad = (uint8_t *)(*bh)->b_data + *offset; - *offset += ad_size; - - if (!ad) { - brelse(*bh); - *error = 1; - return NULL; - } - - if (*offset == dir->i_sb->s_blocksize) { - brelse(*bh); - block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos); - if (!block) - return NULL; - *bh = udf_tread(dir->i_sb, block); - if (!*bh) - return NULL; - } else if (*offset > dir->i_sb->s_blocksize) { - ad = tmpad; - - remainder = dir->i_sb->s_blocksize - loffset; - memcpy((uint8_t *)ad, (*bh)->b_data + loffset, remainder); - - brelse(*bh); - block = udf_get_lb_pblock(dir->i_sb, fe_loc, ++*pos); - if (!block) - return NULL; - (*bh) = udf_tread(dir->i_sb, block); - if (!*bh) - return NULL; - - memcpy((uint8_t *)ad + remainder, (*bh)->b_data, - ad_size - remainder); - *offset = ad_size - remainder; - } - - return ad; -} -#endif - struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos, struct udf_fileident_bh *fibh, struct fileIdentDesc *cfi, @@ -248,39 +195,6 @@ struct fileIdentDesc *udf_get_fileident(void *buffer, int bufsize, int *offset) return fi; } -#if 0 -static struct extent_ad *udf_get_fileextent(void *buffer, int bufsize, int *offset) -{ - struct extent_ad *ext; - struct fileEntry *fe; - uint8_t *ptr; - - if ((!buffer) || (!offset)) { - printk(KERN_ERR "udf: udf_get_fileextent() invalidparms\n"); - return NULL; - } - - fe = (struct fileEntry *)buffer; - - if (fe->descTag.tagIdent != cpu_to_le16(TAG_IDENT_FE)) { - udf_debug("0x%x != TAG_IDENT_FE\n", - le16_to_cpu(fe->descTag.tagIdent)); - return NULL; - } - - ptr = (uint8_t *)(fe->extendedAttr) + - le32_to_cpu(fe->lengthExtendedAttr); - - if ((*offset > 0) && (*offset < le32_to_cpu(fe->lengthAllocDescs))) - ptr += *offset; - - ext = (struct extent_ad *)ptr; - - *offset = *offset + sizeof(struct extent_ad); - return ext; -} -#endif - struct short_ad *udf_get_fileshortad(uint8_t *ptr, int maxoffset, uint32_t *offset, int inc) { diff --git a/fs/udf/lowlevel.c b/fs/udf/lowlevel.c index 1b88fd5df05d..43e24a3b8e10 100644 --- a/fs/udf/lowlevel.c +++ b/fs/udf/lowlevel.c @@ -36,14 +36,10 @@ unsigned int udf_get_last_session(struct super_block *sb) ms_info.addr_format = CDROM_LBA; i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long)&ms_info); -#define WE_OBEY_THE_WRITTEN_STANDARDS 1 - if (i == 0) { udf_debug("XA disk: %s, vol_desc_start=%d\n", (ms_info.xa_flag ? "yes" : "no"), ms_info.addr.lba); -#if WE_OBEY_THE_WRITTEN_STANDARDS if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ -#endif vol_desc_start = ms_info.addr.lba; } else { udf_debug("CDROMMULTISESSION not supported: rc=%d\n", i); From 7c6e3d1aaeb3b25b49510d193000c27037004acb Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Thu, 16 Jul 2009 17:36:54 +0200 Subject: [PATCH 2/4] udf: Remove wrong assignment in udf_symlink Recomputation of the pointer was wrong (it should have been just increment). Luckily, we never use the computed value. Remove it. Signed-off-by: Jan Kara --- fs/udf/namei.c | 1 - 1 file changed, 1 deletion(-) diff --git a/fs/udf/namei.c b/fs/udf/namei.c index 6a29fa34c478..21dad8c608f9 100644 --- a/fs/udf/namei.c +++ b/fs/udf/namei.c @@ -943,7 +943,6 @@ static int udf_symlink(struct inode *dir, struct dentry *dentry, pc->componentType = 1; pc->lengthComponentIdent = 0; pc->componentFileVersionNum = 0; - pc += sizeof(struct pathComponent); elen += sizeof(struct pathComponent); } From 81056dd04465902461b627169c4b4487a11acba1 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Thu, 16 Jul 2009 18:02:25 +0200 Subject: [PATCH 3/4] udf: Perform preallocation only for regular files So far we preallocated blocks also for directories but that brings a problem, when to get rid of preallocated blocks we don't need. So far we removed them in udf_clear_inode() which has a disadvantage that 1) blocks are unavailable long after writing to a directory finished and thus one can get out of space unnecessarily early 2) releasing blocks from udf_clear_inode is problematic because VFS does not expect us to redirty inode there and it also slows down memory reclaim. So preallocate blocks only for regular files where we can drop preallocation in udf_release_file. Signed-off-by: Jan Kara --- fs/udf/inode.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/fs/udf/inode.c b/fs/udf/inode.c index e7533f785636..6d24c2c63f93 100644 --- a/fs/udf/inode.c +++ b/fs/udf/inode.c @@ -90,19 +90,16 @@ no_delete: } /* - * If we are going to release inode from memory, we discard preallocation and - * truncate last inode extent to proper length. We could use drop_inode() but - * it's called under inode_lock and thus we cannot mark inode dirty there. We - * use clear_inode() but we have to make sure to write inode as it's not written - * automatically. + * If we are going to release inode from memory, we truncate last inode extent + * to proper length. We could use drop_inode() but it's called under inode_lock + * and thus we cannot mark inode dirty there. We use clear_inode() but we have + * to make sure to write inode as it's not written automatically. */ void udf_clear_inode(struct inode *inode) { struct udf_inode_info *iinfo; if (!(inode->i_sb->s_flags & MS_RDONLY)) { lock_kernel(); - /* Discard preallocation for directories, symlinks, etc. */ - udf_discard_prealloc(inode); udf_truncate_tail_extent(inode); unlock_kernel(); write_inode_now(inode, 0); @@ -664,8 +661,12 @@ static struct buffer_head *inode_getblk(struct inode *inode, sector_t block, udf_split_extents(inode, &c, offset, newblocknum, laarr, &endnum); #ifdef UDF_PREALLOCATE - /* preallocate blocks */ - udf_prealloc_extents(inode, c, lastblock, laarr, &endnum); + /* We preallocate blocks only for regular files. It also makes sense + * for directories but there's a problem when to drop the + * preallocation. We might use some delayed work for that but I feel + * it's overengineering for a filesystem like UDF. */ + if (S_ISREG(inode->i_mode)) + udf_prealloc_extents(inode, c, lastblock, laarr, &endnum); #endif /* merge any continuous blocks in laarr */ From cbc8cc33529b0e0e55ae0ff077b8cb0b71d54c7a Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Fri, 7 Aug 2009 00:27:27 +0200 Subject: [PATCH 4/4] udf: Fix possible corruption when close races with write When we close a file, we remove preallocated blocks from it. But this truncation was not protected by i_mutex and thus it could have raced with a write through a different fd and cause crashes or even filesystem corruption. Signed-off-by: Jan Kara --- fs/udf/file.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/udf/file.c b/fs/udf/file.c index 7464305382b5..b80cbd78833c 100644 --- a/fs/udf/file.c +++ b/fs/udf/file.c @@ -193,9 +193,11 @@ int udf_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, static int udf_release_file(struct inode *inode, struct file *filp) { if (filp->f_mode & FMODE_WRITE) { + mutex_lock(&inode->i_mutex); lock_kernel(); udf_discard_prealloc(inode); unlock_kernel(); + mutex_unlock(&inode->i_mutex); } return 0; }