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authornpiggin@suse.de <npiggin@suse.de>2009-08-21 02:35:05 +1000
committeral <al@dizzy.pdmi.ras.ru>2009-09-24 08:41:47 -0400
commit25d9e2d15286281ec834b829a4aaf8969011f1cd (patch)
treee4329a481ca197afae30f04335e023c7d04f7d67 /mm/nommu.c
parenteca6f534e61919b28fb21aafbd1c2983deae75be (diff)
downloadvexpress-lsk-25d9e2d15286281ec834b829a4aaf8969011f1cd.tar.gz
truncate: new helpers
Introduce new truncate helpers truncate_pagecache and inode_newsize_ok. vmtruncate is also consolidated from mm/memory.c and mm/nommu.c and into mm/truncate.c. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'mm/nommu.c')
-rw-r--r--mm/nommu.c40
1 files changed, 0 insertions, 40 deletions
diff --git a/mm/nommu.c b/mm/nommu.c
index 8d484241d03..56a446f0597 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -83,46 +83,6 @@ struct vm_operations_struct generic_file_vm_ops = {
};
/*
- * Handle all mappings that got truncated by a "truncate()"
- * system call.
- *
- * NOTE! We have to be ready to update the memory sharing
- * between the file and the memory map for a potential last
- * incomplete page. Ugly, but necessary.
- */
-int vmtruncate(struct inode *inode, loff_t offset)
-{
- struct address_space *mapping = inode->i_mapping;
- unsigned long limit;
-
- if (inode->i_size < offset)
- goto do_expand;
- i_size_write(inode, offset);
-
- truncate_inode_pages(mapping, offset);
- goto out_truncate;
-
-do_expand:
- limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
- if (limit != RLIM_INFINITY && offset > limit)
- goto out_sig;
- if (offset > inode->i_sb->s_maxbytes)
- goto out;
- i_size_write(inode, offset);
-
-out_truncate:
- if (inode->i_op->truncate)
- inode->i_op->truncate(inode);
- return 0;
-out_sig:
- send_sig(SIGXFSZ, current, 0);
-out:
- return -EFBIG;
-}
-
-EXPORT_SYMBOL(vmtruncate);
-
-/*
* Return the total memory allocated for this pointer, not
* just what the caller asked for.
*