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JFFS2: Return early when file read not necessary

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If a destination is not provided, jffs2_1pass_read_inode() only
returns the length of the file. In this case, avoid reading all
the data nodes, and return as soon as the length of the file is
known.

Signed-off-by: Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz>
This commit is contained in:
Mark Tomlinson 2015-07-01 16:38:22 +12:00 committed by Tom Rini
parent 39d0ce0659
commit 3799b3f4ad
1 changed files with 6 additions and 0 deletions
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6
fs/jffs2/jffs2_1pass.c
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@ -719,6 +719,12 @@ jffs2_1pass_read_inode(struct b_lists *pL, u32 inode, char *dest)
}
put_fl_mem(jNode, pL->readbuf);
}
/*
* If no destination is provided, we are done.
* Just return the total size.
*/
if (!dest)
return totalSize;
#endif
for (b = pL->frag.listHead; b != NULL; b = b->next) {