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| author | Artem Bityutskiy <artem.bityutskiy@linux.intel.com> | 2011-12-28 17:08:03 +0200 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2012-01-09 18:26:12 +0000 |
| commit | 4991e7251ed951a5f33faf25912e9db416306309 (patch) | |
| tree | 77454b88465118f8cf1127049cbf96c47da2c415 | |
| parent | cd621274b0ec747db8dedbf857624c067f481976 (diff) | |
| download | linux-stable-4991e7251ed951a5f33faf25912e9db416306309.tar.gz linux-stable-4991e7251ed951a5f33faf25912e9db416306309.tar.bz2 linux-stable-4991e7251ed951a5f33faf25912e9db416306309.zip | |
romfs: do not use mtd->get_unmapped_area directly
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>
| -rw-r--r-- | fs/romfs/mmap-nommu.c | 28 |
1 files changed, 13 insertions, 15 deletions
diff --git a/fs/romfs/mmap-nommu.c b/fs/romfs/mmap-nommu.c index d5168e8e7dcb..e1a7779dd3cb 100644 --- a/fs/romfs/mmap-nommu.c +++ b/fs/romfs/mmap-nommu.c @@ -28,9 +28,10 @@ static unsigned long romfs_get_unmapped_area(struct file *file, struct inode *inode = file->f_mapping->host; struct mtd_info *mtd = inode->i_sb->s_mtd; unsigned long isize, offset, maxpages, lpages; + int ret; if (!mtd) - goto cant_map_directly; + return (unsigned long) -ENOSYS; /* the mapping mustn't extend beyond the EOF */ 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)) return (unsigned long) -EINVAL; - /* we need to call down to the MTD layer to do the actual mapping */ - if (mtd->get_unmapped_area) { - if (addr != 0) - return (unsigned long) -EINVAL; - - if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) - return (unsigned long) -EINVAL; + if (addr != 0) + return (unsigned long) -EINVAL; - offset += ROMFS_I(inode)->i_dataoffset; - if (offset > mtd->size - len) - return (unsigned long) -EINVAL; + if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) + return (unsigned long) -EINVAL; - return mtd_get_unmapped_area(mtd, len, offset, flags); - } + offset += ROMFS_I(inode)->i_dataoffset; + if (offset > mtd->size - len) + return (unsigned long) -EINVAL; -cant_map_directly: - return (unsigned long) -ENOSYS; + ret = mtd_get_unmapped_area(mtd, len, offset, flags); + if (ret == -EOPNOTSUPP) + ret = -ENOSYS; + return (unsigned long) ret; } /* |