VFS: Add a whiteout dentry type (e7f7d225) · Commits · 戴 / test

include/linux/dcache.h

+18 −6

Original line number	Diff line number	Diff line
		@@ -215,11 +215,12 @@ struct dentry_operations {
		#define DCACHE_LRU_LIST 0x00080000

		#define DCACHE_ENTRY_TYPE 0x00700000
		#define DCACHE_MISS_TYPE 0x00000000 /* Negative dentry */
		#define DCACHE_DIRECTORY_TYPE 0x00100000 /* Normal directory */
		#define DCACHE_AUTODIR_TYPE 0x00200000 /* Lookupless directory (presumed automount) */
		#define DCACHE_SYMLINK_TYPE 0x00300000 /* Symlink */
		#define DCACHE_FILE_TYPE 0x00400000 /* Other file type */
		#define DCACHE_MISS_TYPE 0x00000000 /* Negative dentry (maybe fallthru to nowhere) */
		#define DCACHE_WHITEOUT_TYPE 0x00100000 /* Whiteout dentry (stop pathwalk) */
		#define DCACHE_DIRECTORY_TYPE 0x00200000 /* Normal directory */
		#define DCACHE_AUTODIR_TYPE 0x00300000 /* Lookupless directory (presumed automount) */
		#define DCACHE_SYMLINK_TYPE 0x00400000 /* Symlink (or fallthru to such) */
		#define DCACHE_FILE_TYPE 0x00500000 /* Other file type (or fallthru to such) */

		#define DCACHE_MAY_FREE 0x00800000

		@@ -423,6 +424,16 @@ static inline unsigned __d_entry_type(const struct dentry *dentry)
		return dentry->d_flags & DCACHE_ENTRY_TYPE;
		}

		static inline bool d_is_miss(const struct dentry *dentry)
		{
		return __d_entry_type(dentry) == DCACHE_MISS_TYPE;
		}

		static inline bool d_is_whiteout(const struct dentry *dentry)
		{
		return __d_entry_type(dentry) == DCACHE_WHITEOUT_TYPE;
		}

		static inline bool d_can_lookup(const struct dentry *dentry)
		{
		return __d_entry_type(dentry) == DCACHE_DIRECTORY_TYPE;
		@@ -450,7 +461,8 @@ static inline bool d_is_file(const struct dentry *dentry)

		static inline bool d_is_negative(const struct dentry *dentry)
		{
		return __d_entry_type(dentry) == DCACHE_MISS_TYPE;
		// TODO: check d_is_whiteout(dentry) also.
		return d_is_miss(dentry);
		}

		static inline bool d_is_positive(const struct dentry *dentry)

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