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romfs: do not use mtd->get_unmapped_area directly

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Remove direct usage of mtd->get_unmapped_area. Instead, just call
'mtd_get_unmapped_area()' which will return -EOPNOTSUPP if the function
is not implemented, and then test for this code.

We also translate -EOPNOTSUPP to -ENOSYS because this return code is
probably part of the kernel ABI which we do not want to break.

Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Artem Bityutskiy 2011-12-28 17:08:03 +02:00 • committed by David Woodhouse
commit 4991e7251e
1 changed files with 13 additions and 15 deletions
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28
fs/romfs/mmap-nommu.c
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@ -28,9 +28,10 @@ static unsigned long romfs_get_unmapped_area(struct file *file,
struct inode *inode = file->f_mapping->host; struct inode *inode = file->f_mapping->host;
struct mtd_info *mtd = inode->i_sb->s_mtd; struct mtd_info *mtd = inode->i_sb->s_mtd;
unsigned long isize, offset, maxpages, lpages; unsigned long isize, offset, maxpages, lpages;
int ret;
if (!mtd) if (!mtd)
goto cant_map_directly; return (unsigned long) -ENOSYS;
/* the mapping mustn't extend beyond the EOF */ /* the mapping mustn't extend beyond the EOF */
lpages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; lpages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
@ -41,23 +42,20 @@ static unsigned long romfs_get_unmapped_area(struct file *file,
if ((pgoff >= maxpages) || (maxpages - pgoff < lpages)) if ((pgoff >= maxpages) || (maxpages - pgoff < lpages))
return (unsigned long) -EINVAL; return (unsigned long) -EINVAL;
/* we need to call down to the MTD layer to do the actual mapping */ if (addr != 0)
if (mtd->get_unmapped_area) { return (unsigned long) -EINVAL;
if (addr != 0)
return (unsigned long) -EINVAL;
if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
return (unsigned long) -EINVAL; return (unsigned long) -EINVAL;
offset += ROMFS_I(inode)->i_dataoffset; offset += ROMFS_I(inode)->i_dataoffset;
if (offset > mtd->size - len) if (offset > mtd->size - len)
return (unsigned long) -EINVAL; return (unsigned long) -EINVAL;
return mtd_get_unmapped_area(mtd, len, offset, flags); ret = mtd_get_unmapped_area(mtd, len, offset, flags);
} if (ret == -EOPNOTSUPP)
ret = -ENOSYS;
cant_map_directly: return (unsigned long) ret;
return (unsigned long) -ENOSYS;
} }
/* /*