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EntryCache: Add entry_cache_add_missing() for negative caching.

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It provides a way for filesystems to cache a lookup failure and
therefore prevents repeated lookups of missing entries. This is a
common scenario for example in command lookup and compiling, where
each directory in PATH or each include directory is searched for the
given entry.
This commit is contained in:
Michael Lotz
2015-08-20 21:25:56 +02:00
parent 883b3e1d5c
commit efb0a3a853
8 changed files with 53 additions and 7 deletions
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headers/os/drivers/fs_cache.h
+2
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@@ -104,6 +104,8 @@ extern status_t file_map_translate(void *map, off_t offset, size_t size,
/* entry cache */
extern status_t entry_cache_add(dev_t mountID, ino_t dirID, const char* name,
ino_t nodeID);
extern status_t entry_cache_add_missing(dev_t mountID, ino_t dirID,
const char* name);
extern status_t entry_cache_remove(dev_t mountID, ino_t dirID,
const char* name);
headers/private/fs_shell/fssh_api_wrapper.h
+1
View File
@@ -871,6 +871,7 @@
/* entry cache */
#define entry_cache_add fssh_entry_cache_add
#define entry_cache_add_missing fssh_entry_cache_add_missing
#define entry_cache_remove fssh_entry_cache_remove
////////////////////////////////////////////////////////////////////////////////
headers/private/fs_shell/fssh_fs_cache.h
+2
View File
@@ -126,6 +126,8 @@ extern fssh_status_t fssh_file_map_translate(void *_map, fssh_off_t offset,
extern fssh_status_t fssh_entry_cache_add(fssh_dev_t mountID,
fssh_ino_t dirID, const char* name,
fssh_ino_t nodeID);
extern fssh_status_t fssh_entry_cache_add_missing(fssh_dev_t mountID,
fssh_ino_t dirID, const char* name);
extern fssh_status_t fssh_entry_cache_remove(fssh_dev_t mountID,
fssh_ino_t dirID, const char* name);