mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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45254b4fb2
Merge include/linux/efs_fs{_i,_dir}.h into fs/efs/efs.h. efs_vh.h remains
there because this is the IRIX volume header and shouldn't really be
handled by efs but by the partitioning code. efs_sb.h remains there for
now because it's exported to userspace. Of course this wrong and aboot
should have a copy of it's own, but I'll leave that to a separate patch to
avoid any contention.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/*
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* symlink.c
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*
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* Copyright (c) 1999 Al Smith
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*
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* Portions derived from work (c) 1995,1996 Christian Vogelgsang.
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*/
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#include <linux/string.h>
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#include <linux/pagemap.h>
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#include <linux/buffer_head.h>
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#include <linux/smp_lock.h>
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#include "efs.h"
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static int efs_symlink_readpage(struct file *file, struct page *page)
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{
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char *link = kmap(page);
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struct buffer_head * bh;
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struct inode * inode = page->mapping->host;
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efs_block_t size = inode->i_size;
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int err;
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err = -ENAMETOOLONG;
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if (size > 2 * EFS_BLOCKSIZE)
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goto fail_notlocked;
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lock_kernel();
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/* read first 512 bytes of link target */
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err = -EIO;
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bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));
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if (!bh)
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goto fail;
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memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);
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brelse(bh);
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if (size > EFS_BLOCKSIZE) {
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bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));
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if (!bh)
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goto fail;
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memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);
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brelse(bh);
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}
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link[size] = '\0';
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unlock_kernel();
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SetPageUptodate(page);
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kunmap(page);
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unlock_page(page);
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return 0;
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fail:
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unlock_kernel();
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fail_notlocked:
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SetPageError(page);
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kunmap(page);
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unlock_page(page);
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return err;
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}
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const struct address_space_operations efs_symlink_aops = {
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.readpage = efs_symlink_readpage
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};
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