[PATCH 2/3] fs: fat: determine_fatent() error handling

[Heinrich Schuchardt]

Handle disk full errors.

Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
 fs/fat/fat_write.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c
index a137e14f41..57522f96a8 100644
--- a/fs/fat/fat_write.c
+++ b/fs/fat/fat_write.c
@@ -827,6 +827,8 @@ static int new_dir_table(fat_itr *itr)
 	unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;

 	dir_newclust = determine_fatent(mydata, 0);
+	if (dir_newclust < 0)
+		return dir_newclust;

 	/*
 	 * Flush before updating FAT to ensure valid directory structure
@@ -927,8 +929,8 @@ set_contents(fsdata *mydata, dir_entry *dentptr, loff_t pos, __u8 *buffer,
 	     loff_t maxsize, loff_t *gotsize)
 {
 	unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
-	__u32 curclust = START(dentptr);
-	__u32 endclust = 0, newclust = 0;
+	int curclust = START(dentptr);
+	int endclust = 0, newclust = 0;
 	u64 cur_pos, filesize;
 	loff_t offset, actsize, wsize;

@@ -1069,12 +1071,16 @@ set_clusters:
 	/* Assure that curclust is valid */
 	if (!curclust) {
 		curclust = determine_fatent(mydata, 0);
+		if (curclust < 0)
+			return -1;
 		set_start_cluster(mydata, dentptr, curclust);
 	} else {
 		newclust = get_fatent(mydata, curclust);

 		if (IS_LAST_CLUST(newclust, mydata->fatsize)) {
 			newclust = determine_fatent(mydata, curclust);
+			if (newclust < 0)
+				return -1;
 			set_fatent_value(mydata, curclust, newclust);
 			curclust = newclust;
 		} else {
@@ -1095,6 +1101,8 @@ set_clusters:
 		/* search for consecutive clusters */
 		while (actsize < filesize) {
 			newclust = determine_fatent(mydata, endclust);
+			if (newclust < 0)
+				return -1;

 			if ((newclust - 1) != endclust)
 				/* write to <curclust..endclust> */
--
2.30.2