diff options
Diffstat (limited to 'source3/smbd/vfs.c')
| -rw-r--r-- | source3/smbd/vfs.c | 168 |
1 files changed, 57 insertions, 111 deletions
diff --git a/source3/smbd/vfs.c b/source3/smbd/vfs.c index 628d2eec4b..45d0788117 100644 --- a/source3/smbd/vfs.c +++ b/source3/smbd/vfs.c @@ -731,152 +731,98 @@ int vfs_ChDir(connection_struct *conn, const char *path) return(res); } -/* number of list structures for a caching GetWd function. */ -#define MAX_GETWDCACHE (50) - -static struct { - SMB_DEV_T dev; /* These *must* be compatible with the types returned in a stat() call. */ - SMB_INO_T inode; /* These *must* be compatible with the types returned in a stat() call. */ - char *path; /* The pathname. */ - bool valid; -} ino_list[MAX_GETWDCACHE]; - -extern bool use_getwd_cache; - -/**************************************************************************** - Prompte a ptr (to make it recently used) -****************************************************************************/ - -static void array_promote(char *array,int elsize,int element) -{ - char *p; - if (element == 0) - return; - - p = (char *)SMB_MALLOC(elsize); - - if (!p) { - DEBUG(5,("array_promote: malloc fail\n")); - return; - } - - memcpy(p,array + element * elsize, elsize); - memmove(array + elsize,array,elsize*element); - memcpy(array,p,elsize); - SAFE_FREE(p); -} - /******************************************************************* Return the absolute current directory path - given a UNIX pathname. Note that this path is returned in DOS format, not UNIX format. Note this can be called with conn == NULL. ********************************************************************/ +struct getwd_cache_key { + SMB_DEV_T dev; + SMB_INO_T ino; +}; + char *vfs_GetWd(TALLOC_CTX *ctx, connection_struct *conn) { char s[PATH_MAX+1]; - static bool getwd_cache_init = False; SMB_STRUCT_STAT st, st2; - int i; - char *ret = NULL; + char *result; + DATA_BLOB cache_value; + struct getwd_cache_key key; *s = 0; - if (!use_getwd_cache) { - nocache: - ret = SMB_VFS_GETWD(conn,s); - if (!ret) { - DEBUG(0,("vfs_GetWd: SMB_VFS_GETWD call failed, " - "errno %s\n",strerror(errno))); - return NULL; - } - return talloc_strdup(ctx, ret); - } - - /* init the cache */ - if (!getwd_cache_init) { - getwd_cache_init = True; - for (i=0;i<MAX_GETWDCACHE;i++) { - string_set(&ino_list[i].path,""); - ino_list[i].valid = False; - } + if (!lp_getwd_cache()) { + goto nocache; } - /* Get the inode of the current directory, if this doesn't work we're - in trouble :-) */ + SET_STAT_INVALID(st); if (SMB_VFS_STAT(conn, ".",&st) == -1) { - /* Known to fail for root: the directory may be - * NFS-mounted and exported with root_squash (so has no root access). */ + /* + * Known to fail for root: the directory may be NFS-mounted + * and exported with root_squash (so has no root access). + */ DEBUG(1,("vfs_GetWd: couldn't stat \".\" error %s " - "(NFS problem ?)\n", - strerror(errno) )); + "(NFS problem ?)\n", strerror(errno) )); goto nocache; } + ZERO_STRUCT(key); /* unlikely, but possible padding */ + key.dev = st.st_dev; + key.ino = st.st_ino; - for (i=0; i<MAX_GETWDCACHE; i++) { - if (ino_list[i].valid) { - - /* If we have found an entry with a matching inode and dev number - then find the inode number for the directory in the cached string. - If this agrees with that returned by the stat for the current - directory then all is o.k. (but make sure it is a directory all - the same...) */ - - if (st.st_ino == ino_list[i].inode && st.st_dev == ino_list[i].dev) { - if (SMB_VFS_STAT(conn,ino_list[i].path,&st2) == 0) { - if (st.st_ino == st2.st_ino && st.st_dev == st2.st_dev && - (st2.st_mode & S_IFMT) == S_IFDIR) { + if (!memcache_lookup(smbd_memcache(), GETWD_CACHE, + data_blob_const(&key, sizeof(key)), + &cache_value)) { + goto nocache; + } - ret = talloc_strdup(ctx, - ino_list[i].path); + SMB_ASSERT((cache_value.length > 0) + && (cache_value.data[cache_value.length-1] == '\0')); - /* promote it for future use */ - array_promote((char *)&ino_list[0],sizeof(ino_list[0]),i); - if (ret == NULL) { - errno = ENOMEM; - } - return ret; - } else { - /* If the inode is different then something's changed, - scrub the entry and start from scratch. */ - ino_list[i].valid = False; - } - } - } + if ((SMB_VFS_STAT(conn, (char *)cache_value.data, &st2) == 0) + && (st.st_dev == st2.st_dev) && (st.st_ino == st2.st_ino) + && (S_ISDIR(st.st_mode))) { + /* + * Ok, we're done + */ + result = talloc_strdup(ctx, (char *)cache_value.data); + if (result == NULL) { + errno = ENOMEM; } + return result; } - /* We don't have the information to hand so rely on traditional - * methods. The very slow getcwd, which spawns a process on some - * systems, or the not quite so bad getwd. */ + nocache: + + /* + * We don't have the information to hand so rely on traditional + * methods. The very slow getcwd, which spawns a process on some + * systems, or the not quite so bad getwd. + */ if (!SMB_VFS_GETWD(conn,s)) { - DEBUG(0,("vfs_GetWd: SMB_VFS_GETWD call failed, errno %s\n", - strerror(errno))); - return (NULL); + DEBUG(0, ("vfs_GetWd: SMB_VFS_GETWD call failed: %s\n", + strerror(errno))); + return NULL; } - ret = talloc_strdup(ctx,s); - - DEBUG(5,("vfs_GetWd %s, inode %.0f, dev %.0f\n", - s,(double)st.st_ino,(double)st.st_dev)); - - /* add it to the cache */ - i = MAX_GETWDCACHE - 1; - string_set(&ino_list[i].path,s); - ino_list[i].dev = st.st_dev; - ino_list[i].inode = st.st_ino; - ino_list[i].valid = True; + if (lp_getwd_cache() && VALID_STAT(st)) { + ZERO_STRUCT(key); /* unlikely, but possible padding */ + key.dev = st.st_dev; + key.ino = st.st_ino; - /* put it at the top of the list */ - array_promote((char *)&ino_list[0],sizeof(ino_list[0]),i); + memcache_add(smbd_memcache(), GETWD_CACHE, + data_blob_const(&key, sizeof(key)), + data_blob_const(s, strlen(s)+1)); + } - if (ret == NULL) { + result = talloc_strdup(ctx, s); + if (result == NULL) { errno = ENOMEM; } - return ret; + return result; } /******************************************************************* |