On Thu 07-02-08 16:02:57, Rasmus Rohde wrote:
>
> > > Before posting the last and hopefully final patch I'd like to know what
> > > Jan says about open coding the lookup for ..
> > > It will mean a lot of code duplication and I think it makes good sense
> > > for udf_find_entry to be able to handle ..
> > Yes, I think opencoding it would really lead to larger code duplication
> > than I'd like so please keep the change in udf_find_entry(). Thanks.
> Great - then I think we are hopefully at a patch that can be accepted.
Yeah, the patch looks fine. Thanks for your work. I'll send it to Andrew.
> Signed-off-by: Rasmus Rohde <rohde@xxxxxxx>
>
> diff -uprN -X linux-2.6.24-mm1-vanilla/Documentation/dontdiff linux-2.6.24-mm1-vanilla/fs/udf/namei.c linux-2.6.24-mm1/fs/udf/namei.c
> --- linux-2.6.24-mm1-vanilla/fs/udf/namei.c 2008-02-06 21:23:36.000000000 +0100
> +++ linux-2.6.24-mm1/fs/udf/namei.c 2008-02-07 07:13:04.000000000 +0100
> @@ -31,6 +31,7 @@
> #include <linux/smp_lock.h>
> #include <linux/buffer_head.h>
> #include <linux/sched.h>
> +#include <linux/exportfs.h>
>
> static inline int udf_match(int len1, const char *name1, int len2,
> const char *name2)
> @@ -159,6 +160,8 @@ static struct fileIdentDesc *udf_find_en
> sector_t offset;
> struct extent_position epos = {};
> struct udf_inode_info *dinfo = UDF_I(dir);
> + int isdotdot = dentry->d_name.len == 2 &&
> + dentry->d_name.name[0] == '.' && dentry->d_name.name[1] == '.';
>
> size = udf_ext0_offset(dir) + dir->i_size;
> f_pos = udf_ext0_offset(dir);
> @@ -232,6 +235,12 @@ static struct fileIdentDesc *udf_find_en
> continue;
> }
>
> + if ((cfi->fileCharacteristics & FID_FILE_CHAR_PARENT) &&
> + isdotdot) {
> + brelse(epos.bh);
> + return fi;
> + }
> +
> if (!lfi)
> continue;
>
> @@ -324,9 +333,8 @@ static struct dentry *udf_lookup(struct
> }
> }
> unlock_kernel();
> - d_add(dentry, inode);
>
> - return NULL;
> + return d_splice_alias(inode, dentry);
> }
>
> static struct fileIdentDesc *udf_add_entry(struct inode *dir,
> @@ -1298,6 +1306,134 @@ end_rename:
> return retval;
> }
>
> +static struct dentry *udf_get_parent(struct dentry *child)
> +{
> + struct dentry *parent;
> + struct inode *inode = NULL;
> + struct dentry dotdot;
> + struct fileIdentDesc cfi;
> + struct udf_fileident_bh fibh;
> +
> + dotdot.d_name.name = "..";
> + dotdot.d_name.len = 2;
> +
> + lock_kernel();
> + if (!udf_find_entry(child->d_inode, &dotdot, &fibh, &cfi))
> + goto out_unlock;
> +
> + if (fibh.sbh != fibh.ebh)
> + brelse(fibh.ebh);
> + brelse(fibh.sbh);
> +
> + inode = udf_iget(child->d_inode->i_sb,
> + lelb_to_cpu(cfi.icb.extLocation));
> + if (!inode)
> + goto out_unlock;
> + unlock_kernel();
> +
> + parent = d_alloc_anon(inode);
> + if (!parent) {
> + iput(inode);
> + parent = ERR_PTR(-ENOMEM);
> + }
> +
> + return parent;
> +out_unlock:
> + unlock_kernel();
> + return ERR_PTR(-EACCES);
> +}
> +
> +
> +static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
> + u16 partref, __u32 generation)
> +{
> + struct inode *inode;
> + struct dentry *result;
> + kernel_lb_addr loc;
> +
> + if (block == 0)
> + return ERR_PTR(-ESTALE);
> +
> + loc.logicalBlockNum = block;
> + loc.partitionReferenceNum = partref;
> + inode = udf_iget(sb, loc);
> +
> + if (inode == NULL)
> + return ERR_PTR(-ENOMEM);
> +
> + if (generation && inode->i_generation != generation) {
> + iput(inode);
> + return ERR_PTR(-ESTALE);
> + }
> + result = d_alloc_anon(inode);
> + if (!result) {
> + iput(inode);
> + return ERR_PTR(-ENOMEM);
> + }
> + return result;
> +}
> +
> +static struct dentry *udf_fh_to_dentry(struct super_block *sb,
> + struct fid *fid, int fh_len, int fh_type)
> +{
> + if ((fh_len != 3 && fh_len != 5) ||
> + (fh_type != FILEID_UDF_WITH_PARENT &&
> + fh_type != FILEID_UDF_WITHOUT_PARENT))
> + return NULL;
> +
> + return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
> + fid->udf.generation);
> +}
> +
> +static struct dentry *udf_fh_to_parent(struct super_block *sb,
> + struct fid *fid, int fh_len, int fh_type)
> +{
> + if (fh_len != 5 || fh_type != FILEID_UDF_WITH_PARENT)
> + return NULL;
> +
> + return udf_nfs_get_inode(sb, fid->udf.parent_block,
> + fid->udf.parent_partref,
> + fid->udf.parent_generation);
> +}
> +static int udf_encode_fh(struct dentry *de, __u32 *fh, int *lenp,
> + int connectable)
> +{
> + int len = *lenp;
> + struct inode *inode = de->d_inode;
> + kernel_lb_addr location = UDF_I(inode)->i_location;
> + struct fid *fid = (struct fid *)fh;
> + int type = FILEID_UDF_WITHOUT_PARENT;
> +
> + if (len < 3 || (connectable && len < 5))
> + return 255;
> +
> + *lenp = 3;
> + fid->udf.block = location.logicalBlockNum;
> + fid->udf.partref = location.partitionReferenceNum;
> + fid->udf.generation = inode->i_generation;
> +
> + if (connectable && !S_ISDIR(inode->i_mode)) {
> + spin_lock(&de->d_lock);
> + inode = de->d_parent->d_inode;
> + location = UDF_I(inode)->i_location;
> + fid->udf.parent_block = location.logicalBlockNum;
> + fid->udf.parent_partref = location.partitionReferenceNum;
> + fid->udf.parent_generation = inode->i_generation;
> + spin_unlock(&de->d_lock);
> + *lenp = 5;
> + type = FILEID_UDF_WITH_PARENT;
> + }
> +
> + return type;
> +}
> +
> +const struct export_operations udf_export_ops = {
> + .encode_fh = udf_encode_fh,
> + .fh_to_dentry = udf_fh_to_dentry,
> + .fh_to_parent = udf_fh_to_parent,
> + .get_parent = udf_get_parent,
> +};
> +
> const struct inode_operations udf_dir_inode_operations = {
> .lookup = udf_lookup,
> .create = udf_create,
> diff -uprN -X linux-2.6.24-mm1-vanilla/Documentation/dontdiff linux-2.6.24-mm1-vanilla/fs/udf/super.c linux-2.6.24-mm1/fs/udf/super.c
> --- linux-2.6.24-mm1-vanilla/fs/udf/super.c 2008-02-06 21:23:36.000000000 +0100
> +++ linux-2.6.24-mm1/fs/udf/super.c 2008-02-07 07:06:30.000000000 +0100
> @@ -1801,6 +1801,7 @@ static int udf_fill_super(struct super_b
>
> /* Fill in the rest of the superblock */
> sb->s_op = &udf_sb_ops;
> + sb->s_export_op = &udf_export_ops;
> sb->dq_op = NULL;
> sb->s_dirt = 0;
> sb->s_magic = UDF_SUPER_MAGIC;
> diff -uprN -X linux-2.6.24-mm1-vanilla/Documentation/dontdiff linux-2.6.24-mm1-vanilla/fs/udf/udfdecl.h linux-2.6.24-mm1/fs/udf/udfdecl.h
> --- linux-2.6.24-mm1-vanilla/fs/udf/udfdecl.h 2008-02-06 21:23:36.000000000 +0100
> +++ linux-2.6.24-mm1/fs/udf/udfdecl.h 2008-02-07 07:11:24.000000000 +0100
> @@ -45,6 +45,7 @@ struct task_struct;
> struct buffer_head;
> struct super_block;
>
> +extern const struct export_operations udf_export_ops;
> extern const struct inode_operations udf_dir_inode_operations;
> extern const struct file_operations udf_dir_operations;
> extern const struct inode_operations udf_file_inode_operations;
> diff -uprN -X linux-2.6.24-mm1-vanilla/Documentation/dontdiff linux-2.6.24-mm1-vanilla/include/linux/exportfs.h linux-2.6.24-mm1/include/linux/exportfs.h
> --- linux-2.6.24-mm1-vanilla/include/linux/exportfs.h 2008-02-06 21:23:46.000000000 +0100
> +++ linux-2.6.24-mm1/include/linux/exportfs.h 2008-02-06 21:25:06.000000000 +0100
> @@ -33,6 +33,19 @@ enum fid_type {
> * 32 bit parent directory inode number.
> */
> FILEID_INO32_GEN_PARENT = 2,
> +
> + /*
> + * 32 bit block number, 16 bit partition reference,
> + * 16 bit unused, 32 bit generation number.
> + */
> + FILEID_UDF_WITHOUT_PARENT = 0x51,
> +
> + /*
> + * 32 bit block number, 16 bit partition reference,
> + * 16 bit unused, 32 bit generation number,
> + * 32 bit parent block number, 32 bit parent generation number
> + */
> + FILEID_UDF_WITH_PARENT = 0x52,
> };
>
> struct fid {
> @@ -43,6 +56,14 @@ struct fid {
> u32 parent_ino;
> u32 parent_gen;
> } i32;
> + struct {
> + u32 block;
> + u16 partref;
> + u16 parent_partref;
> + u32 generation;
> + u32 parent_block;
> + u32 parent_generation;
> + } udf;
> __u32 raw[6];
> };
> };
>
>
Honza
--
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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