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authorIngo Molnar <mingo@elte.hu>2008-09-11 07:37:28 -0400
committerIngo Molnar <mingo@elte.hu>2008-09-11 07:37:28 -0400
commit09b22a2f678ae733801b888c44756d0abd686b8a (patch)
tree6ca52d4011ce6b11c6450d3a574ea6a53cc0d339 /fs/ubifs/misc.h
parent3ba35573ad9a149a3af19625b502679283382f6b (diff)
parentadee14b2e1557d0a8559f29681732d05a89dfc35 (diff)
Merge commit 'v2.6.27-rc6' into sched/devel
Diffstat (limited to 'fs/ubifs/misc.h')
-rw-r--r--fs/ubifs/misc.h49
1 files changed, 17 insertions, 32 deletions
diff --git a/fs/ubifs/misc.h b/fs/ubifs/misc.h
index 87dabf9fe742..4c12a9215d7f 100644
--- a/fs/ubifs/misc.h
+++ b/fs/ubifs/misc.h
@@ -284,38 +284,6 @@ static inline void *ubifs_idx_key(const struct ubifs_info *c,
284} 284}
285 285
286/** 286/**
287 * ubifs_reported_space - calculate reported free space.
288 * @c: the UBIFS file-system description object
289 * @free: amount of free space
290 *
291 * This function calculates amount of free space which will be reported to
292 * user-space. User-space application tend to expect that if the file-system
293 * (e.g., via the 'statfs()' call) reports that it has N bytes available, they
294 * are able to write a file of size N. UBIFS attaches node headers to each data
295 * node and it has to write indexind nodes as well. This introduces additional
296 * overhead, and UBIFS it has to report sligtly less free space to meet the
297 * above expectetion.
298 *
299 * This function assumes free space is made up of uncompressed data nodes and
300 * full index nodes (one per data node, doubled because we always allow enough
301 * space to write the index twice).
302 *
303 * Note, the calculation is pessimistic, which means that most of the time
304 * UBIFS reports less space than it actually has.
305 */
306static inline long long ubifs_reported_space(const struct ubifs_info *c,
307 uint64_t free)
308{
309 int divisor, factor;
310
311 divisor = UBIFS_MAX_DATA_NODE_SZ + (c->max_idx_node_sz * 3);
312 factor = UBIFS_MAX_DATA_NODE_SZ - UBIFS_DATA_NODE_SZ;
313 do_div(free, divisor);
314
315 return free * factor;
316}
317
318/**
319 * ubifs_current_time - round current time to time granularity. 287 * ubifs_current_time - round current time to time granularity.
320 * @inode: inode 288 * @inode: inode
321 */ 289 */
@@ -325,4 +293,21 @@ static inline struct timespec ubifs_current_time(struct inode *inode)
325 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC; 293 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
326} 294}
327 295
296/**
297 * ubifs_tnc_lookup - look up a file-system node.
298 * @c: UBIFS file-system description object
299 * @key: node key to lookup
300 * @node: the node is returned here
301 *
302 * This function look up and reads node with key @key. The caller has to make
303 * sure the @node buffer is large enough to fit the node. Returns zero in case
304 * of success, %-ENOENT if the node was not found, and a negative error code in
305 * case of failure.
306 */
307static inline int ubifs_tnc_lookup(struct ubifs_info *c,
308 const union ubifs_key *key, void *node)
309{
310 return ubifs_tnc_locate(c, key, node, NULL, NULL);
311}
312
328#endif /* __UBIFS_MISC_H__ */ 313#endif /* __UBIFS_MISC_H__ */