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switch generic_write_checks() to iocb and iter

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... returning -E... upon error and amount of data left in iter after
(possible) truncation upon success.  Note, that normal case gives
a non-zero (positive) return value, so any tests for != 0 _must_ be
updated.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Conflicts:
	fs/ext4/file.c
This commit is contained in:
Al Viro
2015-04-09 12:55:47 -04:00
parent 90320251db
commit 3309dd04cb
14 changed files with 100 additions and 167 deletions
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11
fs/ntfs/file.c
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@@ -339,17 +339,14 @@ static ssize_t ntfs_prepare_file_for_write(struct kiocb *iocb,
struct inode *vi = file_inode(file);
ntfs_inode *base_ni, *ni = NTFS_I(vi);
ntfs_volume *vol = ni->vol;
size_t count = iov_iter_count(from);
ntfs_debug("Entering for i_ino 0x%lx, attribute type 0x%x, pos "
"0x%llx, count 0x%zx.", vi->i_ino,
(unsigned)le32_to_cpu(ni->type),
(unsigned long long)iocb->ki_pos, count);
err = generic_write_checks(file, &iocb->ki_pos, &count);
if (unlikely(err))
goto out;
iov_iter_truncate(from, count);
if (count == 0)
(unsigned long long)iocb->ki_pos,
iov_iter_count(from));
err = generic_write_checks(iocb, from);
if (unlikely(err <= 0))
goto out;
/*
* All checks have passed. Before we start doing any writing we want