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Subject[PATCH 05/21] target: Convert backend ->create_virtdevice() call to return ERR_PTR
Date
From: Nicholas Bellinger <nab@linux-iscsi.org>

This patch converts the target_core_store_dev_enable() -> struct
se_subsystem_api->create_virtdevice() call to return proper ERR_PTR values
back up to configfs logic during backend dependent struct se_device ENABLE
exception conditions.

Along with the change to target_core_configfs.c, this includes converting IBLOCK,
FILEIO, pSCSI, and RAMDISK_* backend subsystem plugins to obtain upper level
PTR_ERR return codes (where available), and return via ERR_PTR during a
*_create_virtdev() failure.

Reported-by: Fubo Chen <fubo.chen@gmail.com>
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_configfs.c | 4 +++-
drivers/target/target_core_file.c | 13 +++++++++----
drivers/target/target_core_iblock.c | 15 ++++++++-------
drivers/target/target_core_pscsi.c | 18 +++++++++---------
drivers/target/target_core_rd.c | 8 +++++---
5 files changed, 34 insertions(+), 24 deletions(-)

diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_core_configfs.c
index c9254d7..9721ef2 100644
--- a/drivers/target/target_core_configfs.c
+++ b/drivers/target/target_core_configfs.c
@@ -1827,7 +1827,9 @@ static ssize_t target_core_store_dev_enable(
return -EINVAL;

dev = t->create_virtdevice(hba, se_dev, se_dev->se_dev_su_ptr);
- if (!(dev) || IS_ERR(dev))
+ if (IS_ERR(dev))
+ return PTR_ERR(dev);
+ else if (!dev)
return -EINVAL;

se_dev->se_dev_ptr = dev;
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c
index 676a010..ae2bf71 100644
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -135,7 +135,7 @@ static struct se_device *fd_create_virtdevice(
mm_segment_t old_fs;
struct file *file;
struct inode *inode = NULL;
- int dev_flags = 0, flags;
+ int dev_flags = 0, flags, ret = -EINVAL;

memset(&dev_limits, 0, sizeof(struct se_dev_limits));

@@ -147,6 +147,7 @@ static struct se_device *fd_create_virtdevice(
if (IS_ERR(dev_p)) {
printk(KERN_ERR "getname(%s) failed: %lu\n",
fd_dev->fd_dev_name, IS_ERR(dev_p));
+ ret = PTR_ERR(dev_p);
goto fail;
}
#if 0
@@ -166,8 +167,12 @@ static struct se_device *fd_create_virtdevice(
flags |= O_SYNC;

file = filp_open(dev_p, flags, 0600);
-
- if (IS_ERR(file) || !file || !file->f_dentry) {
+ if (IS_ERR(file)) {
+ printk(KERN_ERR "filp_open(%s) failed\n", dev_p);
+ ret = PTR_ERR(file);
+ goto fail;
+ }
+ if (!file || !file->f_dentry) {
printk(KERN_ERR "filp_open(%s) failed\n", dev_p);
goto fail;
}
@@ -242,7 +247,7 @@ fail:
fd_dev->fd_file = NULL;
}
putname(dev_p);
- return NULL;
+ return ERR_PTR(ret);
}

/* fd_free_device(): (Part of se_subsystem_api_t template)
diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index 422187b..9140be3 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -130,10 +130,11 @@ static struct se_device *iblock_create_virtdevice(
struct request_queue *q;
struct queue_limits *limits;
u32 dev_flags = 0;
+ int ret = -EINVAL;

if (!(ib_dev)) {
printk(KERN_ERR "Unable to locate struct iblock_dev parameter\n");
- return 0;
+ return ERR_PTR(ret);
}
memset(&dev_limits, 0, sizeof(struct se_dev_limits));
/*
@@ -142,7 +143,7 @@ static struct se_device *iblock_create_virtdevice(
ib_dev->ibd_bio_set = bioset_create(32, 64);
if (!(ib_dev->ibd_bio_set)) {
printk(KERN_ERR "IBLOCK: Unable to create bioset()\n");
- return 0;
+ return ERR_PTR(-ENOMEM);
}
printk(KERN_INFO "IBLOCK: Created bio_set()\n");
/*
@@ -154,8 +155,10 @@ static struct se_device *iblock_create_virtdevice(

bd = blkdev_get_by_path(ib_dev->ibd_udev_path,
FMODE_WRITE|FMODE_READ|FMODE_EXCL, ib_dev);
- if (IS_ERR(bd))
+ if (IS_ERR(bd)) {
+ ret = PTR_ERR(bd);
goto failed;
+ }
/*
* Setup the local scope queue_limits from struct request_queue->limits
* to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
@@ -185,9 +188,7 @@ static struct se_device *iblock_create_virtdevice(
* the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM
* in ATA and we need to set TPE=1
*/
- if (blk_queue_discard(bdev_get_queue(bd))) {
- struct request_queue *q = bdev_get_queue(bd);
-
+ if (blk_queue_discard(q)) {
DEV_ATTRIB(dev)->max_unmap_lba_count =
q->limits.max_discard_sectors;
/*
@@ -213,7 +214,7 @@ failed:
ib_dev->ibd_bd = NULL;
ib_dev->ibd_major = 0;
ib_dev->ibd_minor = 0;
- return NULL;
+ return ERR_PTR(ret);
}

static void iblock_free_device(void *p)
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
index f596cb7..e795f7d 100644
--- a/drivers/target/target_core_pscsi.c
+++ b/drivers/target/target_core_pscsi.c
@@ -556,7 +556,7 @@ static struct se_device *pscsi_create_virtdevice(
if (!(pdv)) {
printk(KERN_ERR "Unable to locate struct pscsi_dev_virt"
" parameter\n");
- return NULL;
+ return ERR_PTR(-EINVAL);
}
/*
* If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
@@ -566,7 +566,7 @@ static struct se_device *pscsi_create_virtdevice(
if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
printk(KERN_ERR "pSCSI: Unable to locate struct"
" Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
- return NULL;
+ return ERR_PTR(-ENODEV);
}
/*
* For the newer PHV_VIRUTAL_HOST_ID struct scsi_device
@@ -575,7 +575,7 @@ static struct se_device *pscsi_create_virtdevice(
if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) {
printk(KERN_ERR "pSCSI: udev_path attribute has not"
" been set before ENABLE=1\n");
- return NULL;
+ return ERR_PTR(-EINVAL);
}
/*
* If no scsi_host_id= was passed for PHV_VIRUTAL_HOST_ID,
@@ -588,12 +588,12 @@ static struct se_device *pscsi_create_virtdevice(
printk(KERN_ERR "pSCSI: Unable to set hba_mode"
" with active devices\n");
spin_unlock(&hba->device_lock);
- return NULL;
+ return ERR_PTR(-EEXIST);
}
spin_unlock(&hba->device_lock);

if (pscsi_pmode_enable_hba(hba, 1) != 1)
- return NULL;
+ return ERR_PTR(-ENODEV);

legacy_mode_enable = 1;
hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
@@ -603,14 +603,14 @@ static struct se_device *pscsi_create_virtdevice(
if (!(sh)) {
printk(KERN_ERR "pSCSI: Unable to locate"
" pdv_host_id: %d\n", pdv->pdv_host_id);
- return NULL;
+ return ERR_PTR(-ENODEV);
}
}
} else {
if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) {
printk(KERN_ERR "pSCSI: PHV_VIRUTAL_HOST_ID set while"
" struct Scsi_Host exists\n");
- return NULL;
+ return ERR_PTR(-EEXIST);
}
}

@@ -645,7 +645,7 @@ static struct se_device *pscsi_create_virtdevice(
hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
}
pdv->pdv_sd = NULL;
- return NULL;
+ return ERR_PTR(-ENODEV);
}
return dev;
}
@@ -661,7 +661,7 @@ static struct se_device *pscsi_create_virtdevice(
hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
}

- return NULL;
+ return ERR_PTR(-ENODEV);
}

/* pscsi_free_device(): (Part of se_subsystem_api_t template)
diff --git a/drivers/target/target_core_rd.c b/drivers/target/target_core_rd.c
index 979aebf..0d0a583 100644
--- a/drivers/target/target_core_rd.c
+++ b/drivers/target/target_core_rd.c
@@ -254,13 +254,15 @@ static struct se_device *rd_create_virtdevice(
struct se_dev_limits dev_limits;
struct rd_dev *rd_dev = p;
struct rd_host *rd_host = hba->hba_ptr;
- int dev_flags = 0;
+ int dev_flags = 0, ret = -EINVAL;
char prod[16], rev[4];

memset(&dev_limits, 0, sizeof(struct se_dev_limits));

- if (rd_build_device_space(rd_dev) < 0)
+ if (rd_build_device_space(rd_dev) < 0) {
+ ret = -ENOMEM;
goto fail;
+ }

snprintf(prod, 16, "RAMDISK-%s", (rd_dev->rd_direct) ? "DR" : "MCP");
snprintf(rev, 4, "%s", (rd_dev->rd_direct) ? RD_DR_VERSION :
@@ -293,7 +295,7 @@ static struct se_device *rd_create_virtdevice(

fail:
rd_release_device_space(rd_dev);
- return NULL;
+ return ERR_PTR(ret);
}

static struct se_device *rd_DIRECT_create_virtdevice(
--
1.7.4.1


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