[patch 083/101] ufs: restore back support of openstep

From: Greg KH
Date: Wed Mar 07 2007 - 12:29:22 EST

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From: Evgeniy Dushistov <dushistov@xxxxxxx>

This is a fix of regression, which triggered by ~2.6.16.

Patch with name ufs-directory-and-page-cache-from-blocks-to-pages.patch: in
additional to conversation from block to page cache mechanism added new
checks of directory integrity, one of them that directory entry do not
across directory chunks.

But some kinds of UFS: OpenStep UFS and Apple UFS (looks like these are the
same filesystems) have different directory chunk size, then common
UFSes(BSD and Solaris UFS).

So this patch adds ability to works with variable size of directory chunks,
and set it for ufstype=openstep to right size.

Tested on darwin ufs.

Signed-off-by: Evgeniy Dushistov <dushistov@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
fs/ufs/dir.c | 21 ++++++++++++---------
fs/ufs/super.c | 5 ++++-
include/linux/ufs_fs.h | 1 +
3 files changed, 17 insertions(+), 10 deletions(-)

--- linux-2.6.20.1.orig/fs/ufs/dir.c
+++ linux-2.6.20.1/fs/ufs/dir.c
@@ -106,12 +106,13 @@ static void ufs_check_page(struct page *
char *kaddr = page_address(page);
unsigned offs, rec_len;
unsigned limit = PAGE_CACHE_SIZE;
+ const unsigned chunk_mask = UFS_SB(sb)->s_uspi->s_dirblksize - 1;
struct ufs_dir_entry *p;
char *error;

if ((dir->i_size >> PAGE_CACHE_SHIFT) == page->index) {
limit = dir->i_size & ~PAGE_CACHE_MASK;
- if (limit & (UFS_SECTOR_SIZE - 1))
+ if (limit & chunk_mask)
goto Ebadsize;
if (!limit)
goto out;
@@ -126,7 +127,7 @@ static void ufs_check_page(struct page *
goto Ealign;
if (rec_len < UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, p)))
goto Enamelen;
- if (((offs + rec_len - 1) ^ offs) & ~(UFS_SECTOR_SIZE-1))
+ if (((offs + rec_len - 1) ^ offs) & ~chunk_mask)
goto Espan;
if (fs32_to_cpu(sb, p->d_ino) > (UFS_SB(sb)->s_uspi->s_ipg *
UFS_SB(sb)->s_uspi->s_ncg))
@@ -310,6 +311,7 @@ int ufs_add_link(struct dentry *dentry,
int namelen = dentry->d_name.len;
struct super_block *sb = dir->i_sb;
unsigned reclen = UFS_DIR_REC_LEN(namelen);
+ const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
unsigned short rec_len, name_len;
struct page *page = NULL;
struct ufs_dir_entry *de;
@@ -342,8 +344,8 @@ int ufs_add_link(struct dentry *dentry,
if ((char *)de == dir_end) {
/* We hit i_size */
name_len = 0;
- rec_len = UFS_SECTOR_SIZE;
- de->d_reclen = cpu_to_fs16(sb, UFS_SECTOR_SIZE);
+ rec_len = chunk_size;
+ de->d_reclen = cpu_to_fs16(sb, chunk_size);
de->d_ino = 0;
goto got_it;
}
@@ -431,7 +433,7 @@ ufs_readdir(struct file *filp, void *dir
unsigned int offset = pos & ~PAGE_CACHE_MASK;
unsigned long n = pos >> PAGE_CACHE_SHIFT;
unsigned long npages = ufs_dir_pages(inode);
- unsigned chunk_mask = ~(UFS_SECTOR_SIZE - 1);
+ unsigned chunk_mask = ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
int need_revalidate = filp->f_version != inode->i_version;
unsigned flags = UFS_SB(sb)->s_flags;

@@ -511,7 +513,7 @@ int ufs_delete_entry(struct inode *inode
struct super_block *sb = inode->i_sb;
struct address_space *mapping = page->mapping;
char *kaddr = page_address(page);
- unsigned from = ((char*)dir - kaddr) & ~(UFS_SECTOR_SIZE - 1);
+ unsigned from = ((char*)dir - kaddr) & ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
unsigned to = ((char*)dir - kaddr) + fs16_to_cpu(sb, dir->d_reclen);
struct ufs_dir_entry *pde = NULL;
struct ufs_dir_entry *de = (struct ufs_dir_entry *) (kaddr + from);
@@ -556,6 +558,7 @@ int ufs_make_empty(struct inode * inode,
struct super_block * sb = dir->i_sb;
struct address_space *mapping = inode->i_mapping;
struct page *page = grab_cache_page(mapping, 0);
+ const unsigned int chunk_size = UFS_SB(sb)->s_uspi->s_dirblksize;
struct ufs_dir_entry * de;
char *base;
int err;
@@ -563,7 +566,7 @@ int ufs_make_empty(struct inode * inode,
if (!page)
return -ENOMEM;
kmap(page);
- err = mapping->a_ops->prepare_write(NULL, page, 0, UFS_SECTOR_SIZE);
+ err = mapping->a_ops->prepare_write(NULL, page, 0, chunk_size);
if (err) {
unlock_page(page);
goto fail;
@@ -584,11 +587,11 @@ int ufs_make_empty(struct inode * inode,
((char *)de + fs16_to_cpu(sb, de->d_reclen));
de->d_ino = cpu_to_fs32(sb, dir->i_ino);
ufs_set_de_type(sb, de, dir->i_mode);
- de->d_reclen = cpu_to_fs16(sb, UFS_SECTOR_SIZE - UFS_DIR_REC_LEN(1));
+ de->d_reclen = cpu_to_fs16(sb, chunk_size - UFS_DIR_REC_LEN(1));
ufs_set_de_namlen(sb, de, 2);
strcpy (de->d_name, "..");

- err = ufs_commit_chunk(page, 0, UFS_SECTOR_SIZE);
+ err = ufs_commit_chunk(page, 0, chunk_size);
fail:
kunmap(page);
page_cache_release(page);
--- linux-2.6.20.1.orig/fs/ufs/super.c
+++ linux-2.6.20.1/fs/ufs/super.c
@@ -649,7 +649,7 @@ static int ufs_fill_super(struct super_b
kmalloc (sizeof(struct ufs_sb_private_info), GFP_KERNEL);
if (!uspi)
goto failed;
-
+ uspi->s_dirblksize = UFS_SECTOR_SIZE;
super_block_offset=UFS_SBLOCK;

/* Keep 2Gig file limit. Some UFS variants need to override
@@ -718,6 +718,7 @@ static int ufs_fill_super(struct super_b
break;

case UFS_MOUNT_UFSTYPE_NEXTSTEP:
+ /*TODO: check may be we need set special dir block size?*/
UFSD("ufstype=nextstep\n");
uspi->s_fsize = block_size = 1024;
uspi->s_fmask = ~(1024 - 1);
@@ -733,6 +734,7 @@ static int ufs_fill_super(struct super_b
break;

case UFS_MOUNT_UFSTYPE_NEXTSTEP_CD:
+ /*TODO: check may be we need set special dir block size?*/
UFSD("ufstype=nextstep-cd\n");
uspi->s_fsize = block_size = 2048;
uspi->s_fmask = ~(2048 - 1);
@@ -754,6 +756,7 @@ static int ufs_fill_super(struct super_b
uspi->s_fshift = 10;
uspi->s_sbsize = super_block_size = 2048;
uspi->s_sbbase = 0;
+ uspi->s_dirblksize = 1024;
flags |= UFS_DE_44BSD | UFS_UID_44BSD | UFS_ST_44BSD | UFS_CG_44BSD;
if (!(sb->s_flags & MS_RDONLY)) {
if (!silent)
--- linux-2.6.20.1.orig/include/linux/ufs_fs.h
+++ linux-2.6.20.1/include/linux/ufs_fs.h
@@ -789,6 +789,7 @@ struct ufs_sb_private_info {

__u32 s_maxsymlinklen;/* upper limit on fast symlinks' size */
__s32 fs_magic; /* filesystem magic */
+ unsigned int s_dirblksize;
};

/*

--
-
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Next message: Greg KH: "[patch 074/101] tty_io: fix race in master pty close/slave pty close path"
Previous message: Greg KH: "[patch 077/101] Backport of psmouse suspend/shutdown cleanups"
In reply to: Greg KH: "[patch 077/101] Backport of psmouse suspend/shutdown cleanups"
Next in thread: Greg KH: "[patch 074/101] tty_io: fix race in master pty close/slave pty close path"
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