函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:fs\quota\quota_v2.c Create Date:2022-07-29 11:09:27
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Read information header from quota file

函数原型：static int v2_read_file_info(struct super_block *sb, int type)

返回类型：int

参数：

类型参数名称
struct super_block *sb
inttype
96  dqopt等于sb_dqopt(sb)
97  info等于 Information for each quota type [type]
103  lock for reading
104  ret等于v2_read_header(sb, type, & dqhead)
105  如果ret小于0则转到:out
107  version等于le32_to_cpu(File version )
108  如果 Id of the dqi_format - used when turning * quotas on after remount RW 恒等于QFMT_VFS_V0且version不等于0或 Id of the dqi_format - used when turning * quotas on after remount RW 恒等于QFMT_VFS_V1且version不等于1则
110  ret等于负EINVAL
111  转到:out
114  size等于quota_read(sb, type, (char * ) & dinfo, sizeof(structv2_disk_dqinfo), Offset of info header in file )
116  如果size不等于sizeof(structv2_disk_dqinfo)则
117  quota_error(sb, "Can't read info structure")
118  如果size小于0则ret等于size
120  否则ret等于负EIO
122  转到:out
124  dqi_priv等于开辟内存
125  如果非dqi_priv则
126  ret等于负ENOMEM
127  转到:out
129  qinfo等于dqi_priv
130  如果version恒等于0则
132  Maximum space limit [static] 等于0xffffffffLL左移QUOTABLOCK_BITS位
133  Maximum inode limit [static] 等于0xffffffff
134  否则
140  Maximum space limit [static] 等于0x7fffffffffffffffLL
141  Maximum inode limit [static] 等于0x7fffffffffffffffLL
143  Space grace time [dq_data_lock] 等于le32_to_cpu(Time before block soft limit becomes hard limit )
144  Inode grace time [dq_data_lock] 等于le32_to_cpu(Time before inode soft limit becomes hard limit )
146  DFQ_ flags [dq_data_lock] 等于0
147  Sb quota is on 等于sb
148  Quota type 等于type
149  # of blocks in quota file 等于le32_to_cpu(Number of blocks in file )
150  First block in list of free blocks 等于le32_to_cpu(Number of first free block in the list )
151  First block with free entry 等于le32_to_cpu(Number of block with at least one free entry )
152  Block size of quota file 等于Size of leaf block in tree
153  Space usable in block for quota data 等于1左移Size of leaf block in tree 位
154  Precomputed depth of quota tree 等于qtree_depth(qinfo)
155  如果version恒等于0则
156  Size of quota entry in quota file 等于sizeof(structv2r0_disk_dqblk)
157  Operations for entry manipulation 等于v2r0_qtree_ops
158  否则
159  Size of quota entry in quota file 等于sizeof(structv2r1_disk_dqblk)
160  Operations for entry manipulation 等于v2r1_qtree_ops
162  ret等于0
163  out :
164  lease a read lock
165  返回:ret