linux-kernel - [PATCH] f2fs: fix wrong check on F2FS_IOC

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Message-Id: <20200305234822.178708-1-jaegeuk@kernel.org>
Date:   Thu,  5 Mar 2020 15:48:22 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>,
        Daniel Rosenberg <drosen@...gle.com>
Subject: [PATCH] f2fs: fix wrong check on F2FS_IOC_FSSETXATTR

This fixes the incorrect failure when enabling project quota on casefold-enabled
file.

Cc: Daniel Rosenberg <drosen@...gle.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/file.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index fb070816a8a5..8a41afac0346 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1789,12 +1789,15 @@ static int f2fs_file_flush(struct file *file, fl_owner_t id)
 static int f2fs_setflags_common(struct inode *inode, u32 iflags, u32 mask)
 {
 	struct f2fs_inode_info *fi = F2FS_I(inode);
+	u32 masked_flags = fi->i_flags & mask;
+
+	f2fs_bug_on(F2FS_I_SB(inode), (iflags & ~mask));
 
 	/* Is it quota file? Do not allow user to mess with it */
 	if (IS_NOQUOTA(inode))
 		return -EPERM;
 
-	if ((iflags ^ fi->i_flags) & F2FS_CASEFOLD_FL) {
+	if ((iflags ^ masked_flags) & F2FS_CASEFOLD_FL) {
 		if (!f2fs_sb_has_casefold(F2FS_I_SB(inode)))
 			return -EOPNOTSUPP;
 		if (!f2fs_empty_dir(inode))
@@ -1808,9 +1811,9 @@ static int f2fs_setflags_common(struct inode *inode, u32 iflags, u32 mask)
 			return -EINVAL;
 	}
 
-	if ((iflags ^ fi->i_flags) & F2FS_COMPR_FL) {
+	if ((iflags ^ masked_flags) & F2FS_COMPR_FL) {
 		if (S_ISREG(inode->i_mode) &&
-			(fi->i_flags & F2FS_COMPR_FL || i_size_read(inode) ||
+			(masked_flags & F2FS_COMPR_FL || i_size_read(inode) ||
 						F2FS_HAS_BLOCKS(inode)))
 			return -EINVAL;
 		if (iflags & F2FS_NOCOMP_FL)
@@ -1827,16 +1830,16 @@ static int f2fs_setflags_common(struct inode *inode, u32 iflags, u32 mask)
 			set_compress_context(inode);
 		}
 	}
-	if ((iflags ^ fi->i_flags) & F2FS_NOCOMP_FL) {
-		if (fi->i_flags & F2FS_COMPR_FL)
+	if ((iflags ^ masked_flags) & F2FS_NOCOMP_FL) {
+		if (masked_flags & F2FS_COMPR_FL)
 			return -EINVAL;
 	}
 
 	fi->i_flags = iflags | (fi->i_flags & ~mask);
-	f2fs_bug_on(F2FS_I_SB(inode), (fi->i_flags & F2FS_COMPR_FL) &&
-					(fi->i_flags & F2FS_NOCOMP_FL));
+	f2fs_bug_on(F2FS_I_SB(inode), (masked_flags & F2FS_COMPR_FL) &&
+					(masked_flags & F2FS_NOCOMP_FL));
 
-	if (fi->i_flags & F2FS_PROJINHERIT_FL)
+	if (masked_flags & F2FS_PROJINHERIT_FL)
 		set_inode_flag(inode, FI_PROJ_INHERIT);
 	else
 		clear_inode_flag(inode, FI_PROJ_INHERIT);
-- 
2.25.1.481.gfbce0eb801-goog