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ac09f03327
This is implemented by filling in our export ops functions. When we get those right, the VFS handles most of the details for us. Internally, scoutfs handles are two u64's (ino and parent ino) and a type which indicates whether the handle contains the parent ino or not. Surpisingly enough, no existing type matches this pattern so we use our own types to identify the handle. Most of the export ops are self explanatory scoutfs_encode_fh() takes an inode and an optional parent and encodes those into the smallest handle that would fit. scoutfs_fh_to_[dentry|parent] turn an existing file handle into a dentry. scoutfs_get_parent() is a bit different and would be called on directory inodes to connect a disconnected dentry path. For scoutfs_get_parent(), we can export add_next_linkref() and use the backref mechanism to quickly find a parent directory. scoutfs_get_name() is almost identical to scoutfs_get_parent(). Here we're linking an inode to a name which exists in the parent directory. We can also use add_next_linkref, and simply copy the name from the backref. As a result of this patch we can also now export scoutfs file systems via NFS, however testing NFS thoroughly is outside the scope of this work so export support should be considered experimental at best. Signed-off-by: Mark Fasheh <mfasheh@versity.com> [zab edited <= NAME_MAX]
34 lines
933 B
C
34 lines
933 B
C
#ifndef _SCOUTFS_DIR_H_
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#define _SCOUTFS_DIR_H_
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#include "format.h"
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#include "lock.h"
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extern const struct file_operations scoutfs_dir_fops;
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extern const struct inode_operations scoutfs_dir_iops;
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extern const struct inode_operations scoutfs_symlink_iops;
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struct scoutfs_link_backref_entry {
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struct list_head head;
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u16 name_len;
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struct scoutfs_link_backref_key lbkey;
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};
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int scoutfs_dir_get_backref_path(struct super_block *sb, u64 target_ino,
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u64 dir_ino, char *name, u16 name_len,
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struct list_head *list);
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void scoutfs_dir_free_backref_path(struct super_block *sb,
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struct list_head *list);
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int scoutfs_dir_add_next_linkref(struct super_block *sb, u64 ino,
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u64 dir_ino, char *name, unsigned int name_len,
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struct list_head *list);
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int scoutfs_symlink_drop(struct super_block *sb, u64 ino,
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struct scoutfs_lock *lock, u64 i_size);
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int scoutfs_dir_init(void);
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void scoutfs_dir_exit(void);
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#endif
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