diff options
author | Ingo Molnar <mingo@elte.hu> | 2008-09-11 07:37:28 -0400 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-09-11 07:37:28 -0400 |
commit | 09b22a2f678ae733801b888c44756d0abd686b8a (patch) | |
tree | 6ca52d4011ce6b11c6450d3a574ea6a53cc0d339 /fs/ubifs/misc.h | |
parent | 3ba35573ad9a149a3af19625b502679283382f6b (diff) | |
parent | adee14b2e1557d0a8559f29681732d05a89dfc35 (diff) |
Merge commit 'v2.6.27-rc6' into sched/devel
Diffstat (limited to 'fs/ubifs/misc.h')
-rw-r--r-- | fs/ubifs/misc.h | 49 |
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 | */ | ||
306 | static 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 | */ | ||
307 | static 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__ */ |