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[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry
Give the statfs superblock operation a dentry pointer rather than a superblock pointer. This complements the get_sb() patch. That reduced the significance of sb->s_root, allowing NFS to place a fake root there. However, NFS does require a dentry to use as a target for the statfs operation. This permits the root in the vfsmount to be used instead. linux/mount.h has been added where necessary to make allyesconfig build successfully. Interest has also been expressed for use with the FUSE and XFS filesystems. Signed-off-by: David Howells <[email protected]> Acked-by: Al Viro <[email protected]> Cc: Nathan Scott <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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60 changed files with 175 additions and 144 deletions
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@ -91,7 +91,7 @@ static void udf_load_partdesc(struct super_block *, struct buffer_head *);
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static void udf_open_lvid(struct super_block *);
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static void udf_close_lvid(struct super_block *);
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static unsigned int udf_count_free(struct super_block *);
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static int udf_statfs(struct super_block *, struct kstatfs *);
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static int udf_statfs(struct dentry *, struct kstatfs *);
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/* UDF filesystem type */
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static int udf_get_sb(struct file_system_type *fs_type,
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@ -1779,8 +1779,10 @@ udf_put_super(struct super_block *sb)
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* Written, tested, and released.
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*/
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static int
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udf_statfs(struct super_block *sb, struct kstatfs *buf)
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udf_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct super_block *sb = dentry->d_sb;
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buf->f_type = UDF_SUPER_MAGIC;
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buf->f_bsize = sb->s_blocksize;
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buf->f_blocks = UDF_SB_PARTLEN(sb, UDF_SB_PARTITION(sb));
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